{"type": "FeatureCollection", "features": [{"id": "10.1007/s11104-005-0194-2", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:15:27Z", "type": "Journal Article", "created": "2012-03-12", "title": "Long-Term Integrated Soil Fertility Management In South-Western Nigeria: Crop Performance And Impact On The Soil Fertility Status", "description": "Crop response, tree biomass production and changes in soil fertility characteristics were monitored in a long-term (1986\u20132006) alley-cropping trial in Ibadan, Nigeria. The systems included two alley cropping systems with Leucaena leucocephala and Senna siamea on the one hand and a control (no-trees) system on the other hand, all cropped annually with a maize- cowpea rotation. All systems had a plus and minus fertilizer treatment. Over the years, the annual biomass return through tree prunings declined steadily, but more drastically for Leucaena than for Senna. In 2002, the nitrogen contribution from Leucaena residues stabilized at about 200 kg N/ha/year, while the corresponding value for Senna was about 160 kg N/ha/year. On average, the four Leucaena prunings were more equal in biomass as well as in amounts of N, P and cations, while the first Senna pruning was always contributing up to 60% of the annual biomass or nutrient return. Maize crop yields declined steadily in all treatments, but the least so in the Senna + fertilizer treatment where in 2002 still 2.2 t/ha of maize were obtained. Nitrogen fertilizer use efficiency was usually higher in the Senna treatment compared to the control or the Leucaena treatment. Added benefits due to the combined use of fertilizer N and organic matter additions were observed only for the Senna treatment and only in the last 6 years. At all other times, they remained absent or were even negative in the Leucaena treatments for the first 3 years. Most chemical soil fertility parameters decreased in all the treatments, but less so in the alley cropping systems. The presence of trees had a positive effect on remaining carbon stocks, while they were reduced compared to the 1986 data. Trees had a positive effect on the maintenance of exchangeable cations in the top soil. Exchangeable Ca, Mg and K \u2013 and hence ECEC \u2013 were only slightly reduced after 16 years of cropping in the tree-based systems, and even increased in the Senna treatments. In the control treatments, values for all these parameters reduced to 50% or less of the original values after 20 years. All the above points to the Senna-based alley system with fertilizers as the more resilient one. This is reflected in all soil fertility parameters, in added benefits due to the combined use of fertilizer nitrogen and organic residue application and in a more stable maize yield over the years, averaging 2.8 t/ha with maximal deviations from the average not exceeding 21%.", "keywords": ["alley cropping", "0106 biological sciences", "added benefits", "fertilizers", "senna siamea", "yields", "dry matter content", "fertilidad del suelo", "maize", "01 natural sciences", "nitrogen use efficiency", "cowpeas", "ma\u00edz", "zea mays", "vigna unguiculata", "propiedades f\u00edsico - qu\u00edmicas suelo", "aplicaci\u00f3n de abonos", "hedgerow", "fijaci\u00f3n del nitr\u00f3geno", "2. Zero hunger", "biomass", "caup\u00ed", "soil chemicophysical properties", "nutrient", "soil fertility", "fertilizer application", "04 agricultural and veterinary sciences", "15. Life on land", "6. Clean water", "biomasa", "leucaena leucocephala", "nitrogen fixation", "cultivo entre l\u00edneas", "0401 agriculture", " forestry", " and fisheries", "rendimiento", "contenido de materia seca"]}, "links": [{"href": "http://ciat-library.ciat.cgiar.org/Articulos_Ciat/D2-PDF.pdf"}, {"href": "https://doi.org/10.1007/s11104-005-0194-2"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s11104-005-0194-2", "name": "item", "description": "10.1007/s11104-005-0194-2", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s11104-005-0194-2"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-06-01T00:00:00Z"}}, {"id": "10.1007/bf00055428", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:14:50Z", "type": "Journal Article", "created": "2004-11-04", "title": "Leucaena Plus Maize Alley Cropping In Malawi .1. Effects Of N, P, And Leaf Application On Maize Yields And Soil Properties", "description": "Yields under alley cropping might be improved if the most limiting nutrients not adequately supplied or cycled by the leaves could be added as an inorganic fertilizer supplement. Three historic leaf management strategies had been in effect for 3 years ina Leucaena leucocephala alley cropping trial on the Lilongwe Plain of central Malawi : 1) leaves returned; 2) leaves removed; and 3) leaves removed, with 100 kg inorganic N ha\u22121 added. An initial soil analysis showed P status to be suboptimal under all strategies. A confounded 34 factorial experiment was conducted with the following treatments: leaf management strategy (as above), N fertilizer rate (0, 30, and 60 kg N ha\u22121), P fertilizer rate (0, 18, and 35 kg P ha\u22121), and maize population (14,800, 29,600, and 44,400 plants ha\u22121). Both N and P were yield limiting, and interacted positively to improve yields. The addition of 30 kg N and 18 kg P ha\u22121 improved yields similarly under all leaf management strategies by an average of 2440 kg ha\u22121. Increasing the rates to 60 kg N and 35 kg P ha\u22121 improved yields an additional 1990 kg ha\u22121 in the \u2018leaves returned\u2019 and leaves removed + N\u2019 strategies, but did not improve yields under the \u2018leaves removed\u2019 strategy. Lower yields were related to lack of P response at the highest P rate in this treatment, which may have induced Zn deficiency. Plots receiving leaves had higher organic C, total N, pH, exchangeable Ca, Mg, K, and S, and lower C/N ratios in the 0\u201315 cm soil layer than did plots where leaves had been removed. Leaf removal with N addition was similar to leaf removal alone for all soil factors measured except for organic C and total N, which were higher where N had been added. The results show that N and P were the primary yield-limiting nutrients. Historic N application maintained the soil's ability to respond to N and P on par with leaf additions.", "keywords": ["2. Zero hunger", "leucaena leucocephala", "sulfur", "zinc", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "6. Clean water"], "contacts": [{"organization": "Jones, R.B., Wendt, W., Bunderson, W.T., Itimu, O.A.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/bf00055428"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/bf00055428", "name": "item", "description": "10.1007/bf00055428", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/bf00055428"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1996-03-01T00:00:00Z"}}, {"id": "10.1007/bf00055429", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:14:50Z", "type": "Journal Article", "created": "2004-11-04", "title": "Leucaena Plus Maize Alley Cropping In Malawi .2. Residual P And Leaf Management Effects On Maize Nutrition And Soil Properties", "description": "Agroforestry systems involving leaf removal for animal fodder may result in rapid depletion of soil fertility. The purpose of this research was to determine if the effects of leaf removal on soil fertility parameters and maize yield in a Leucaena leucocephala alley cropping system could be reversed. Three leaf management strategies in a Leucaena alley cropping trial that had been in effect from 1987 to 1991 were investigated: 1) leaves returned, 2) leaves removed, and 3) leaves removed, with 100 kg inorganic N ha\u22121 added. In the 1990/91 season, a 34 confounded factorial design was utilized to investigate the effects of leaf management strategy, N rate (0, 30 and 60 kg N ha\u22121); maize plant population (14,800, 29,600, and 44,400 plants ha\u22121); and P rate (0, 18, and 35 kg P ha\u22121). In the 1991/92 and 1992/93 seasons, leaves were applied equally to all plots, and no P was applied. The N rate and plant population treatments were continued, and the same confounded factorial design was implemented to investigate residual leaf management strategy, residual P rate, n rate, and plant population. The yield gap between the plots where leaves had been returned vs. removed narrowed each season due to uniform leaf application. Application of N improved yields during both seasons. Residual effects of the initial P application decreased to only 10% of the total yield in 1992/93. Plant population affected yields only during the season of very good rainfall. Leaf additions resulted in a relative increase in soil pH, total N,and exchangeable Ca, Mg, and K and a decrease C/N ratio in plots that had not previously received leaves. Leaves supplied more K and Zn to the upper 15 cm of soil than were being extracted by the maize crop, but uniform leaf additions eliminated differences in K and Zn uptake. Plant Zn uptake decreased with increasing P rate and plant population, and increased with increasing N rate and a history of leaf return. The results show that applying leaves equilibrated yields within two seasons, and resulted in a relative improvement of several soil properties. The residual effect from P applications was not adequate to maximize yields.", "keywords": ["alley cropping", "2. Zero hunger", "leucaena leucocephala", "soil fertility", "agroforestry systems", "yields", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "maize", "plant population", "6. Clean water"], "contacts": [{"organization": "Wendt, J.W., Jones, R.B., Bunderson, W.T., Itimu, A.O.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/bf00055429"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/bf00055429", "name": "item", "description": "10.1007/bf00055429", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/bf00055429"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1996-03-01T00:00:00Z"}}, {"id": "10.1007/bf00704833", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:14:53Z", "type": "Journal Article", "created": "2004-11-30", "title": "The Effects Of Alley Cropping Withleucaena Leucocephala And Of Different Management Practices On The Productivity Of Maize And Soil Chemical Properties In Lowland Coastal Kenya", "description": "The effects of leucaena hedgerows, mulching with leucaena foliage (0,50 and 100% of harvested foliage), cowpea intercropping and adition of dairy cattle slurry (55 t ha\u22121 per maize crop) on the yield of maize from a sandy soil were assessed. The four-year results from five maize crops are reported. Except in the first year, yields of maize grain and stover were significantly reduced by 30% in the presence of leucaena hedgerows. Use of leucaena mulch eliminated this effect; application of all the harvested leucaena mulch (100%) increased the total maize grain yield of the five crops by 44% over sole maize. Hedgerow and mulching management required an additional 36 mandays labour ha\u22121 which was more than compensated by the increased maize yields. Furthermore leucaena hedgerows substantially depressed the growth of weeds between cropping seasons. Intercropping with cowpea significantly depressed yields of maize grain and stover when both crops were sown together, but not in later seasons when cowpea was sown four weeks after the maize. Application of slurry increased the total yields of maize grain and stover by 35 and 37%, respectively. The grain yield of maize in leucaena hedgerow treatments fertilized with slurry did not respond to application of more than 50% of leucaena foliage, which suggested that half of the foliage could be spared for feeding to livestock. The cumulative yield of maize grain from the highest yielding organic system was 85% of the yield from the fertilizer treatment. The study, which is continuing, demonstrates that large increases in agricultural productivity are possible through the intercropping of maize with woody forage and grain legumes and the integration of dairy cattle production into the system. It thus shows the importance of exploiting crop/livestock interactions.", "keywords": ["alley cropping", "2. Zero hunger", "0106 biological sciences", "productivity", "seasons", "soil chemicophysical properties", "labour requirements", "yields", "dry matter content", "04 agricultural and veterinary sciences", "harvesting", "15. Life on land", "01 natural sciences", "mulches", "6. Clean water", "zea mays", "leucaena leucocephala", "0401 agriculture", " forestry", " and fisheries", "intercropping", "management"], "contacts": [{"organization": "Mureithi, J.G., Tayler, R.S., Thorpe, W.R.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/bf00704833"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/bf00704833", "name": "item", "description": "10.1007/bf00704833", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/bf00704833"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1994-07-01T00:00:00Z"}}, {"id": "10.1007/bf00712055", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:14:53Z", "type": "Journal Article", "created": "2004-11-30", "title": "Productivity Of Alley Farming With Leucaena (Leucaena-Leucocephala Lam De Wit) And Napier Grass (Pennisetum-Purpureum Schum,K.) In Coastal Lowland Kenya", "description": "Inadequate supply of fodder is a serious constraint to the potentially-promising small-holder-dairy production system in coastal Kenya. Alley farming could be an approach to addressing this problem. A study of forage production based on Napier grass and leucaena in an alley cropping system was conducted on an infertile sandy soil in lowland coastal Kenya. The effects of leucaena hedgerows,Clitoria ternatea (L.) intercropping, addition of slurry (110 t ha\u22121 yr\u22121) and two harvesting managements (severe and lenient) on the yield of Napier grass fodder, were assessed. The study was initiated in 1989 and three years results are reported.", "keywords": ["alley cropping", "clitoria ternatea", "2. Zero hunger", "0106 biological sciences", "productivity", "yields", "dairy cattle", "04 agricultural and veterinary sciences", "harvesting", "15. Life on land", "nutritive value", "01 natural sciences", "6. Clean water", "small farms", "leucaena leucocephala", "0401 agriculture", " forestry", " and fisheries", "hedges", "pennisetum purpureum", "performance"], "contacts": [{"organization": "Mureithi, J.G., Taylor, R.S., Thorpe, W.R.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/bf00712055"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/bf00712055", "name": "item", "description": "10.1007/bf00712055", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/bf00712055"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1995-07-01T00:00:00Z"}}, {"id": "10.1007/bf02139631", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:14:53Z", "type": "Journal Article", "created": "2005-09-15", "title": "Alley Cropping Sequentially Cropped Maize And Cowpea With Leucaena On A Sandy Soil In Southern Nigeria", "description": "The potential of alley cropping maize and cowpea with the giant Leucaena (Leucaena leucocephala (Lam) de Wit) cultivar K-28 was studied on an Entisol (Psammentic Ustorthent) in Southern Nigeria. In this trial the crops were grown in 4 m wide alleys formed by periodically pruned leucaena hedgerows. The effect of application of leucaena prunings, nitrogen fertilizer and tillage was studied. Despite the very intensive pruning regime (five prunings/year) for a six-year period, the leucaena hedgerows continue to produce substantial amounts of prunings, nitrogen yield and stakes. Application of nitrogen to the maize crop increased dry matter and nitrogen yield from the leucaena prunings. Although high nitrogen yield was obtained from the prunings, the application of low nitrogen rates was still needed for obtaining a high maize yield. Maize grain yield can be sustained at about 2.0 t/ha with continuous application of leucacna prunings only. Without application of leucaena prunings and nitrogen maize yield continued to decline with subsequent croppings. Cowpea grain yield was not affected either by leucaena prunings or by residual nitrogen. Tillage (rototilling) resulted in either higher or the same maize and cowpea yields as compared with no-tillage. Application of leucaena prunings resulted in higher soil moisture retention, organic matter, exchangeable K, Ca, Mg, and also nitrate levels in the soil solution. Leucaena and maize appear to extract soil moisture from different zones in the soil. Timely pruning of hedgerows is necessary to minimize shading.", "keywords": ["alley cropping", "2. Zero hunger", "leucaena leucocephala", "soil nutrient", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "maize", "cowpeas"], "contacts": [{"organization": "Kang, B.T., Grimme, H., Lawson, T.L.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/bf02139631"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/bf02139631", "name": "item", "description": "10.1007/bf02139631", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/bf02139631"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1985-06-01T00:00:00Z"}}, {"id": "10.1007/s10457-005-2442-0", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:15:14Z", "type": "Journal Article", "created": "2005-05-11", "title": "Soil Water Regime Under Rotational Fallow And Alternating Hedgerows On An Ultisol In Southern Cameroon", "description": "Soil moisture depletion during dry seasons by planted hedgerows to lower levels than under natural fallow, would reduce drainage and nutrient losses in the following rainy season when food crops are grown. The volumetric water content of the 0\u2013150 cm soil profile was measured under planted hedgerows (alternating Leucaena leucocephala and Gliricidia sepium) and natural fallow, both either annually cropped to sole maize or in a two-year crop/two-year fallow rotation, in the humid forest zone (annual rainfall 1700 mm) of southern Cameroon during the 1995\u20131996 and 1996\u20131997 dry seasons. Hedgerows were cut to 0.05 m height, largely eliminating trees\u2019 water consumption during cropping phases. Differences in total soil water content at 0\u2013150 cm depth, between systems, occurred only in the early phases of the 1996\u20131997 dry season. In both dry seasons, differences between systems in water content were found in some soil layers, all within 0\u201360 cm depth, yet, without consistent advantage of any system in exploiting the topsoil water resources. Soil water content was lower under L. leucocephala than G. sepium at 20\u201340 cm depth only. Below 60 cm depth, no differences in water regimes between systems were found. Under southern Cameroonian conditions it is unlikely that any of the systems has an advantage in accessing or recovering water and thus, if available, nutrients from the sub-soil. None of the systems examined was capable of delaying drainage and thus it appears unlikely that downward displacement of nutrients is delayed after the start of the rains.", "keywords": ["alley cropping", "2. Zero hunger", "0106 biological sciences", "gliricidia sepium", "leucaena leucocephala", "fallow", "0401 agriculture", " forestry", " and fisheries", "nutrient cycling", "04 agricultural and veterinary sciences", "15. Life on land", "01 natural sciences", "6. Clean water", "soil"], "contacts": [{"organization": "Stefan Hauser, B. Duguma, Lindsey Norgrove, Lindsey Norgrove, E. Asaah,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s10457-005-2442-0"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10457-005-2442-0", "name": "item", "description": "10.1007/s10457-005-2442-0", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10457-005-2442-0"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-07-01T00:00:00Z"}}, {"id": "10.1007/s10457-008-9152-3", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:15:15Z", "type": "Journal Article", "created": "2008-05-23", "title": "Combining Napier Grass With Leguminous Shrubs In Contour Hedgerows Controls Soil Erosion Without Competing With Crops", "description": "We established hedges/barriers of calliandra (Calliandra calothyrsus Meissner), leucaena (Leucaena trichandra (Zucc.) Urban)) and napier grass (Pennisetum purpureum Schumach) and combination hedges of either calliandra or leucaena with napier grass on slopes exceeding 5% to study the effect of vegetative barriers on productivity of arable steep-lands in central Kenya. Hedges/barriers were pruned regularly and biomass incorporated into the plots. Hedge plots were monitored for soil fertility, soil losses and maize crop yield changes. Inorganic-N concentration in the tree hedge plots was higher than in the control and napier barrier plots after 20 months. Napier grass barriers were the most effective in reducing erosion losses across the two seasons. The effectiveness of napier grass to significantly reduce soil erosion was detectable in one year old napier barriers. Soil loss from all the other one year old vegetative treatments was similar to soil loss from the control. Seventeen month old combination hedge plots recorded lower soil losses than tree hedges of the same age (P = 0.012). Maize crop yields throughout the trial period were high and similar for leguminous and combination hedge plots, but lower in the napier grass and control plots. Overall, we observed that the combination hedges seemed to provide a win-win scenario of reduction in soil erosion combined with improvement of maize crop yields and soil fertility enhancement. We conclude that vegetative hedges have a potential for improving soil productivity in arable steep-lands of the central highlands of Kenya, and that in adoption of vegetative hedges for this purpose there are trade-offs between soil conservation, soil fertility and maize crop yields to be considered.", "keywords": ["2. Zero hunger", "0106 biological sciences", "soil erosion", "soil fertility", "forestry", "Soil erosion", "0401 agriculture", " forestry", " and fisheries", "leucaena", "04 agricultural and veterinary sciences", "Contour hedges", "15. Life on land", "Soil fertility", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1007/s10457-008-9152-3"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10457-008-9152-3", "name": "item", "description": "10.1007/s10457-008-9152-3", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10457-008-9152-3"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2008-05-24T00:00:00Z"}}, {"id": "10.1007/s11104-004-0599-3", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:15:27Z", "type": "Journal Article", "created": "2005-05-31", "title": "Senna Siamea Trees Recycle Ca From A Ca-Rich Subsoil And Increase The Topsoil Ph In Agroforestry Systems In The West African Derived Savanna Zone", "description": "The functioning of trees as a safety-net for capturing nutrients leached beyond the reach of crop roots was evaluated by investigating changes in exchangeable cations (Ca, Mg, and K) and pH in a wide range of medium to long term alley cropping trials in the derived savanna of West Africa, compared to no-tree control plots. Topsoil Ca content, effective cation exchange capacity, and pH were substantially higher under Sennasiamea than under Leucaena leucocephala, Gliricidia sepium, or the no-tree control plots in sites with a Bt horizon rich in exchangeable Ca. This was shown to be largely related to the recovery of Ca from the subsoil under Senna trees. The increase of the Ca content of the topsoil under Senna relative to the no-tree control treatment was related to the total amount of dry matter applied since trial establishment. The lack of increase in Ca accumulation under the other species was related to potential recovery of Ca from the topsoil itself and/or substantial Ca leaching. The accumulation of Ca in the topsoil under Senna had a marked effect on the topsoil pH, the latter increasing significantly compared with the Leucaena, Gliridia, and no-tree control treatments. In conclusion, the current work shows that the functioning of the often hypothesized \u2018safety-net\u2019 of trees in a cropping system depends on (i) the tree species and on (ii) the presence of a subsoil of suitable quality, i.e., clay enriched and with high Ca saturation.", "keywords": ["0106 biological sciences", "senna siamea", "topsoil", "01 natural sciences", "savannas", "agroforestry", "plant litter", "calcio", "subsoil", "top soil", "sabanas", "2. Zero hunger", "calcium", "biomass", "cerca viva", "capa arable del suelo", "litterfall prunings", "ph del suelo", "hojarasca", "trees", "04 agricultural and veterinary sciences", "15. Life on land", "subsoil ca content", "soil ph", "gliricidia sepium", "leucaena leucocephala", "0401 agriculture", " forestry", " and fisheries", "hedges", "agroforesteria", "leucaena lecocephala"]}, "links": [{"href": "https://doi.org/10.1007/s11104-004-0599-3"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Plant%20and%20Soil", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s11104-004-0599-3", "name": "item", "description": "10.1007/s11104-004-0599-3", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s11104-004-0599-3"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2005-02-01T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2004.04.031", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-23T16:17:28Z", "type": "Journal Article", "created": "2004-06-24", "title": "Long-Term Soil Organic Carbon Dynamics In A Subhumid Tropical Climate: 13c Data In Mixed C3/C4 Cropping And Modeling With Rothc", "description": "Abstract   Scanty information on long-term soil organic carbon (SOC) dynamics hampers validation of SOC models in the tropics. We observed SOC content changes in a 16-year continuously cropped agroforestry experiment in Ibadan, south-western Nigeria. SOC levels declined in all treatments. The decline was most pronounced in the no-tree control treatments with continuous maize and cowpea cropping, where SOC levels dropped from the initial 15.4 to 7.3\u20138.0\u00a0Mg\u00a0C\u00a0ha\u22121 in the 0\u201312 cm topsoil in 16 years. In the two continuously cropped alley cropping (AC) systems, one with Leucaena leucocephala and one with Senna siamea trees, SOC levels dropped to 10.7\u201313.2\u00a0Mg\u00a0C\u00a0ha\u22121. Compared to the no-tree control treatments, an annual application of an additional 8.5\u00a0Mg\u00a0ha\u22121 (dry matter) of plant residues, mainly tree prunings, led to an extra 3.5\u00a0Mg\u00a0C\u00a0ha\u22121 (\u223c0.2% C) in the 0\u201312 cm top soil after 11 years, and 4.1\u00a0Mg\u00a0C\u00a0ha\u22121 after 16 years. The addition of NPK fertilizer had little effect on the quantities of above-ground plant residues returned to the soil, and there was no evidence that the fertilizer affected the rate of SOC decomposition. The fact that both C3 and C4 plants returned organic matter to the soil in all cropping systems, but in contrasting proportions, led to clear contrasts in the 13C abundance in the SOC. This 13C information, together with the measured SOC contents, was used to test the ROTHC model. Decomposition was very fast, illustrated by the fact that we had to double all decomposition rate constants in the model in order to simulate the measured contrasts in SOC contents and \u03b413C between the AC treatments and the no-tree controls. We hypothesized (1) that the pruning materials from the legume trees and/or the extra rhizodeposition from the tree roots in the AC treatments accelerated the decomposition of the SOC present at the start of the experiment (true C-priming), and/or (2) that the physical protection of microbial biomass and metabolites by the clay fraction on this site, having a sandy top soil in which clay minerals are mainly of the 1:1 type, is lower than assumed by the model.", "keywords": ["alley cropping", "2. Zero hunger", "leucaena leucocephala", "senna siamea", "soil organic matter", "microbiology", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "tropics"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2004.04.031"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Biology%20and%20Biochemistry", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.soilbio.2004.04.031", "name": "item", "description": "10.1016/j.soilbio.2004.04.031", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2004.04.031"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2004-11-01T00:00:00Z"}}, {"id": "10.1023/a:1006114116095", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:18:08Z", "type": "Journal Article", "created": "2002-12-22", "description": "The potential of alley cropping systems supplied with a limited amount of fertilizer to restore crop productivity on a degraded site and to maintain crop productivity on a recently cleared, non-degraded site on \u2018terre de barre\u2018 soils in Southern Benin was investigated from 1994 to 1996. Leucaena leucocephala, Senna siamea and Gliricidia sepium were used as hedgerow species. Maize yields of the no-tree control plots dropped from the initial (1990) 401 kg ha\u22121 and 2181 kg ha\u22121 on the degraded and non-degraded sites, respectively, to 109 kg ha\u22121 and 1346 kg ha\u22121 in 1996, even with application of a minimal amount of mineral fertilizer. The alley cropping systems produced on average (mean of three treatments and three years) 107% more grain than the initial 1990 values on the degraded site and 11% less grain than the initial 1990 values on the non-degraded site. Especially the Senna and to a lesser degree the Leucaena treatment yielded consistently more grain than the control. The Senna trees contained a larger amount of N and produced more wood during the first pruning on the degraded site (155 kg N ha\u22121 and 14.0 ton fresh wood ha\u22121) than on the non-degraded site (49 kg N ha\u22121 and 6.6 ton fresh wood ha\u22121) most likely because of differences in subsoil fertility, as indicated by the higher clay, exchangeable bases, and N content between 60 and 125 cm cm. N accumulation and wood production by the Leucaena and Gliricidia trees was similar in both sites (82 and 36 kg N ha\u22121 and 4.6 and 9.3 ton fresh wood ha\u22121, respectively). When a limited amount of fertilizer is available, Senna appears to be the best choice as hedgerow species on sites with a relatively fertile subsoil. For other soils, a N2-fixing species may be a better choice.", "keywords": ["0106 biological sciences", "2. Zero hunger", "gliricidia sepium", "leucaena leucocephala", "biomass", "senna siamea", "soil fertility", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "01 natural sciences"]}, "links": [{"href": "https://doi.org/10.1023/a:1006114116095"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1023/a:1006114116095", "name": "item", "description": "10.1023/a:1006114116095", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1023/a:1006114116095"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1998-09-01T00:00:00Z"}}, {"id": "10.1023/a:1006128401073", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:18:08Z", "type": "Journal Article", "created": "2002-12-22", "description": "In cropping systems with limited amounts of external inputs, the soil organic matter pool (SOM) may contribute significantly to plant nutrition. The impact of organic inputs on total SOM and particulate organic matter (POM) N contents as affected by soil type and the relationships between sources of N and maize N uptake were assessed for a set of alley cropping trials in the West- African moist savanna. The trials were established in Niaouli (Benin Republic), in Glidji, Amoutchou, and Sarakawa (Togo), and in Bouake and Ferkessedougou (Cote d\u2018 Ivoire). The total soil N content, averaged over all treatments and years, varied between 324 and 1140 mg N kg\u22121 soil. The POM-N content varied between 50 and 160 mg N kg\u22121 soil. The average proportion of soil N belonging to the POM pool ranged between 9% and 29%. This was significantly related to the annual N inputs from maize stover and prunings, when averaged over the different alley cropping treatments. The trial \u2018age\u2018 also appeared to be related to the impact of the different treatments on the POM-N content. The Ferkessedougou soil contained a relatively higher proportion of total soil N in the POM pool because of its relatively high silt and clay content, compared to the other sites. The relative change in POM-N content between 1996 and the initial sampling was about twice the relative change in total soil N content. This suggests that N incorporated in the POM is relatively labile, compared to N incorporated in the other SOM fractions. Maize N uptake was related to the amount of add pruning-N (partial r2 of 27%), the rainfall during the growing season (partial r2 of 17%), the POM-N content (partial r2 of 14%), and to a lesser degree to the POM N concentration (partial r2 of 5%), the fertilizer N addition rate (partial r2 of 3%), and the silt and clay content of the soil (partial r2 of 3%). The POM-N content was shown to be influenced by organic matter additions and soil characteristics and to contribute significantly to maize N supply. This pool may be an important indicator for the soil fertility status of savanna soils.", "keywords": ["alley cropping", "2. Zero hunger", "senna siamea", "albie lebbeck", "cropping systems", "04 agricultural and veterinary sciences", "particle size", "15. Life on land", "01 natural sciences", "6. Clean water", "gliricidia sepium", "leucaena leucocephala", "soil organic matter", "0401 agriculture", " forestry", " and fisheries", "0105 earth and related environmental sciences"]}, "links": [{"href": "https://doi.org/10.1023/a:1006128401073"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Agroforestry%20Systems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1023/a:1006128401073", "name": "item", "description": "10.1023/a:1006128401073", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1023/a:1006128401073"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1998-09-01T00:00:00Z"}}, {"id": "10.1111/j.1475-2743.1997.tb00572.x", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-06-23T16:19:42Z", "type": "Journal Article", "created": "2007-02-02", "title": "Amelioration Of A Degraded Oxic Paleustalf By Leguminous And Natural Fallows", "description": "<p>Abstract.  The restorative ability of herbaceous (Psophocarpus palustris, Pueraria phaseoloides) and woody (Leucaena leucocephala, Senna siamea, Acacia leptocarpa, Acacia auriculiformis) legume species and of natural regrowth was studied on an eroded and compacted Oxic Paleustalf in southwestern Nigeria. Compared to the control treatment that was continuously cropped for 15 years, four years of fallowing significantly improved test crop yields. However, fallowing with the above species did not substantially improve soil properties, particularly soil bulk density. A longer fallow period may be needed to amend soil physical conditions of this degraded Alfisol. Soil chemical properties were greatly improved following land clearing and plant biomass burning in 1993. However, the residual effect of burning on soil fertility was insignificant in the second cropping year. Among the fallow species, P. palustris and natural fallow showed the best residual effect on test crop performance. Despite the high biomass and nutrient yields of S. siamea and A. auriculiformis, test crop yields on these plots were low due to the border effects from the uncleared and fallowed subplots.</p>", "keywords": ["2. Zero hunger", "soil fertility", "0401 agriculture", " forestry", " and fisheries", "leucaena", "04 agricultural and veterinary sciences", "15. Life on land"], "contacts": [{"organization": "Kang, B.T., Salako, F.K., Akobundu, I.O., Pleysier, J.L., Chianu, J.N.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1111/j.1475-2743.1997.tb00572.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Use%20and%20Management", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1475-2743.1997.tb00572.x", "name": "item", "description": "10.1111/j.1475-2743.1997.tb00572.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1475-2743.1997.tb00572.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "1997-09-01T00:00:00Z"}}, {"id": "10.1111/j.1475-2743.2009.00244.x", "type": "Feature", "geometry": null, "properties": {"updated": "2026-06-23T16:19:43Z", "type": "Journal Article", "created": "2009-09-29", "title": "Effect Of Selected Organic Materials And Inorganic Fertilizer On The Soil Fertility Of A Humic Nitisol In The Central Highlands Of Kenya", "description": "Abstract<p>The effect on soil fertility of applying particular organic resources to a humic Nitisol in the central highlands of Kenya was studied. The organic resources (Calliandra calothyrsus,Leucaena trichandra,Tithonia diversifolia,Mucuna pruriens,Crotalaria ochroleucaand cattle manure) were either applied solely or along with inorganic fertilizer in a cropping trial using maize as the experimental crop. After 4\uffe2\uff80\uff83years of continuous cultivation and manuring, soil fertility effects varied among treatments. Cattle manure proved to be the most effective and improved soil fertility by increasing pH, cations (Ca, K and Mg), and C.Calliandra, Leucaena, Tithoniaand herbaceous legumes generally reduced soil pH, C and N but increased Ca, K and Mg. Cattle manure is therefore an important resource for maintaining soil organic matter (SOM) in the area and in other similar areas with arable\uffe2\uff80\uff90livestock systems. Reduction of soil C and N by the high quality organic materials suggests that their role in maintaining SOM in the long\uffe2\uff80\uff90term is limited in this area. A sound nutrient management system should strive to make a balance between maximizing crop production and sustaining soil quality.</p>", "keywords": ["2. Zero hunger", "Calliandra calothyrsus", "Leucaena trichandra", "Herbaceous legumes", "cattle manure", "Tithonia diversifolia", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "15. Life on land", "630", "6. Clean water"]}, "links": [{"href": "https://doi.org/10.1111/j.1475-2743.2009.00244.x"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Use%20and%20Management", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1111/j.1475-2743.2009.00244.x", "name": "item", "description": "10.1111/j.1475-2743.2009.00244.x", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1111/j.1475-2743.2009.00244.x"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-11-19T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=leucaena&f=json", "hreflang": "en-US"}, {"rel": "alternate", "type": "text/html", "title": "This document as HTML", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=leucaena&f=html", "hreflang": "en-US"}, {"rel": "collection", "type": "application/json", "title": "Collection URL", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main", "hreflang": "en-US"}, {"type": "application/geo+json", "rel": "first", "title": "items (first)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=leucaena&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=leucaena&offset=14", "hreflang": "en-US"}], "numberMatched": 14, "numberReturned": 14, "distributedFeatures": [], "timeStamp": "2026-06-24T14:22:56.496685Z"}