{"type": "FeatureCollection", "features": [{"id": "10.1007/s10705-016-9776-z", "type": "Feature", "geometry": null, "properties": {"updated": "2026-09-22T16:14:59Z", "type": "Journal Article", "created": "2016-04-07", "title": "Soil Nitrogen And Physical Properties And Maize Yields After Mixed Planted Fallows Of Tree And Herbaceous Legumes", "description": "An experiment was conducted at Msekera Research Station from 1998 to 2002 to determine effect of planted fallows of tree species mixed with herbaceous legumes and those of single species fallows on biomass production, soil properties and subsequent maize grain yields. After 2\u00a0years of fallow the highest total above ground biomass of 9.2\u00a0t\u00a0ha\u22121 was recorded in sole Gliricidia. Pre-season soil total inorganic N in 0\u201320\u00a0cm soil depth under tree fallows was highest in Sesbania\u00a0+\u00a0Macrotyloma axillare mixture. Sesbania\u00a0+\u00a0M. axillare mixture had the highest cumulative water intake at fallow clearing. Among the 7 mixtures and 3 sole species treatments, Sesbania\u00a0+\u00a0M. axillare mixture produced the highest maize yield of 2.7 and 1.9\u00a0t\u00a0ha\u22121 in 2001 and 2002 season, respectively, after 2\u00a0years of fallow. The results of the study indicate the complementarity of herbaceous legumes and tree mixtures in improving soil quality. We conclude that mixed species have the potential to increase the amount and quantity of total N added to the soil and increase nutrient cycling. However, maize grain yields were not significantly improved as compared with single species due to low biomass production of the trees. The coiling nature and the added labour requirements for weed control would limit the use of these mixtures by smallholder farmers who are labour constrained. Agroforestry trees and non-twining legumes could be promoted instead.", "keywords": ["580", "2. Zero hunger", "Residual effects", "Herbaceous legumes", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "Mixed fallows", "15. Life on land", "Soil fertility"], "contacts": [{"organization": "Mafongoya, Paramu, L., Jiri, Obert,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s10705-016-9776-z"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Nutrient%20Cycling%20in%20Agroecosystems", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1007/s10705-016-9776-z", "name": "item", "description": "10.1007/s10705-016-9776-z", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s10705-016-9776-z"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2016-04-07T00:00:00Z"}}, {"id": "10.1016/j.still.2008.05.016", "type": "Feature", "geometry": null, "properties": {"license": "Open Access", "updated": "2026-09-22T16:16:41Z", "type": "Journal Article", "created": "2008-09-10", "title": "Effect Of Organic And Inorganic Nutrient Sources On Soil Mineral Nitrogen And Maize Yields In Central Highlands Of Kenya", "description": "Abstract   High population pressure in the central highlands of Kenya has led to continuous cultivation of land with minimal additional inputs leading to soil nutrient depletion. Research work has reported positive results from use of manure and biomass from  Tithonia ,  Calliandra ,  Leucaena ,  Mucuna  and  Crotolaria  for soil fertility replenishment. An experimental field was set up in Chuka Division to test different soil nutrient replenishment treatments. The experimental design was randomised complete block with 14 treatments replicated three times. At the beginning and end of the experiment, soil was sampled at 0\u201315\u00a0cm depth and analysed for pH, Ca, Mg, K, C, N and P. End of the 2000/2001 short rains (SR) season and 2001 long rains (LR) season, soil samples were taken at 0\u201330, 30\u2013100 and 100\u2013150\u00a0cm for nitrate and ammonium analysis. All the treatments received an equivalent of 60\u00a0kg\u00a0N\u00a0ha \u22121 , except herbaceous legume treatments, where N was determined by the amount of the biomass harvested and incorporated in soil and control treatment received no inputs. Results indicate soil fertility increased slightly in all treatments (except control) over the 2-year study period. Average maize grain yield across the treatments was 1.1, 5.4, 3.5 and 4.0\u00a0Mg\u00a0ha \u22121  during the 2000 LR, 2000/2001 SR, 2001 LR and 2001/2002 SR, respectively. The reduced yield in 2000 LR and 2001 LR are attributed to poor rainfall distribution during the two seasons. On average,  Tithonia  with half recommended rate of inorganic fertilizer recorded the highest (4.8\u00a0Mg\u00a0ha \u22121 ) maize yield followed by sole  Tithonia  (4.7\u00a0Mg\u00a0ha \u22121 ). Highest average concentration (144.8 and 115.5\u00a0kg\u00a0N\u00a0ha \u22121 ) of mineral N was recorded at the 30\u2013100\u00a0cm soil depth at the end of both 2000/2001 SR and LR, respectively. The lowest average concentration (67.1\u00a0kg\u00a0N\u00a0ha \u22121 ) was recorded in the 100\u2013150\u00a0cm soil depth in both seasons, while during the 2001 LR, the 0\u201330\u00a0cm soil depth recorded the lowest concentration (52.3\u00a0kg\u00a0N\u00a0ha \u22121 ). The residual mineral N in the 100\u2013150\u00a0cm soil depth doubled at the end of the LR 2001 compared to what was present and the end of the SR 2000/2001 season in all treatments. This shows that there is substantial amount of mineral N that is being leached below the rooting zone of maize in this region.", "keywords": ["2. Zero hunger", "Long rains", "Central highlands of Kenya", "Herbaceous legumes", "Short rains", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "Maize yield", "15. Life on land", "Biomass transfer", "630", "6. Clean water"]}, "links": [{"href": "https://doi.org/10.1016/j.still.2008.05.016"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20and%20Tillage%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.still.2008.05.016", "name": "item", "description": "10.1016/j.still.2008.05.016", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.still.2008.05.016"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-05-01T00:00:00Z"}}, {"id": "10.1111/j.1475-2743.2009.00244.x", "type": "Feature", "geometry": null, "properties": {"license": "Closed Access", "updated": "2026-09-22T16:18:00Z", "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=Herbaceous+legumes&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=Herbaceous+legumes&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=Herbaceous+legumes&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Herbaceous+legumes&offset=3", "hreflang": "en-US"}], "numberMatched": 3, "numberReturned": 3, "distributedFeatures": [], "timeStamp": "2026-09-22T21:01:21.339709Z"}