{"type": "FeatureCollection", "features": [{"id": "10.1007/s11104-010-0626-5", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:14:48Z", "type": "Journal Article", "created": "2010-11-11", "title": "Does the combined application of organic and mineral nutrient sources influence maize productivity? A meta-analysis", "description": "The combined application of organic resources (ORs) and mineral fertilizers is increasingly gaining recognition as a viable approach to address soil fertility decline in sub-Saharan Africa (SSA). We conducted a meta-analysis to provide a comprehensive and quantitative synthesis of conditions under which ORs, N fertilizers, and combined ORs with N fertilizers positively or negatively influence Zea mays (maize) yields, agronomic N use efficiency and soil organic C (SOC) in SSA. Four OR quality classes were assessed; classes I (high quality) and II (intermediate quality) had >2.5% N while classes III (intermediate quality) and IV (low quality) had <2.5% N and classes I and III had <4% polyphenol and <15% lignin. On the average, yield responses over the control were 60%, 84% and 114% following the addition of ORs, N fertilizers and ORs + N fertilizers, respectively. There was a general increase in yield responses with increasing OR quality and OR-N quantity, both when ORs were added alone or with N fertilizers. Surprisingly, greater OR residual effects were observed with high quality ORs and declined with decreasing OR quality. The greater yield responses with ORs + N fertilizers than either resource alone were mostly due to extra N added and not improved N utilization efficiency because negative interactive effects were, most often, observed when combining ORs with N fertilizers. Additionally, their agronomic N use efficiency was not different from sole added ORs but lower than N fertilizers added alone. Nevertheless, positive interactive effects were observed in sandy soils with low quality ORs whereas agronomic use efficiency was greater when smaller quantities of N were added in all soils. Compared to sole added ORs, yield responses for the combined treatment increased with decreasing OR quality and greater yield increases were observed in sandy (68%) than clayey soils (25%). While ORs and ORs + N fertilizer additions increased SOC by at least 12% compared to the control, N fertilizer additions were not different from control suggesting that ORs are needed to increase SOC. Thus, the addition of ORs will likely improve nutrient storage while crop yields are increased and more so for high quality ORs. Furthermore, interactive effects are seldom occurring, but agronomic N use efficiency of ORs + N fertilizers were greater with low quantities of N added, offering potential for increasing crop productivity.", "keywords": ["Soil nutrients", "0106 biological sciences", "Soil management", "Soil Science", "Plant Science", "fertilidad del suelo", "maize", "Soil fertility", "Soil degradation", "Agronomic n use efficiency", "01 natural sciences", "Soil quality", "ma\u00edz", "Soil", "abonos npk", "npk fertilizers", "Field Scale", "2. Zero hunger", "Soil organic matter", "Sub-Saharan Africa", "soil fertility", "04 agricultural and veterinary sciences", "Interactive effects", "15. Life on land", "Organic resource quality", "Yield response", "Integrated soil fertility management", "Meta-analysis", "Zea maize", "Soil conservation", "Fertilization", "0401 agriculture", " forestry", " and fisheries"]}, "links": [{"href": "https://doi.org/10.1007/s11104-010-0626-5"}, {"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/s11104-010-0626-5", "name": "item", "description": "10.1007/s11104-010-0626-5", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s11104-010-0626-5"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2010-11-12T00:00:00Z"}}, {"id": "10.1016/j.soilbio.2017.04.016", "type": "Feature", "geometry": null, "properties": {"updated": "2026-05-25T16:16:56Z", "type": "Journal Article", "created": "2017-04-29", "title": "Soil Macrofauna Abundance Under Dominant Tree Species Increases Along A Soil Degradation Gradient", "description": "Abstract   Soil macrofauna contribute to key soil functions underpinning soil-mediated ecosystem services. There is limited understanding about the role of trees as \u2018resource islands\u2019 for soil macrofauna in agricultural landscapes and how this interaction is affected by soil degradation status. The study assessed the spatial influence of three dominant trees namely,  Croton megalocarpus ,  Eucalyptus grandis  and  Zanthoxylum gilletii , on soil macrofauna abundance, along a soil degradation gradient resulting from continuous cultivation for 10, 16 and 62 years. It was hypothesised that spatial variation in soil macrofauna abundance is affected by duration of cultivation, tree species and distance from the tree trunk. Soils cultivated for 10 years showed highest soil nutrient levels. Notably, soil C and N were higher below the canopy of  C.\u00a0megalocarpus  (64.6\u00a0g\u00a0kg \u22121  C; 6.7\u00a0g\u00a0kg \u22121  N), than  E.\u00a0grandis  (58.7\u00a0g\u00a0kg \u22121  C; 5.9\u00a0g\u00a0kg \u22121  N) and  Z.\u00a0gilletii  (54.5\u00a0g\u00a0kg \u22121  C; 5.6\u00a0g\u00a0kg \u22121  N) after 10 years of cultivation. Similar trends were also found after 16 and 62 years of cultivation, although the mean values for the two elements were below 40.0\u00a0g\u00a0kg \u22121  and 4.0\u00a0g\u00a0kg \u22121 , respectively. Higher soil macrofauna abundance was found after 16 and 62 years of cultivation, though this was dependent on tree species and soil macrofauna group. Earthworm abundance was highest below the canopy of  Z.\u00a0gilletii  averaging 389 individuals and 160 individuals m \u22122 , respectively, compared to 14 individuals m \u22122  after 10 years of cultivation. Conversely, beetles showed higher numbers under  E.\u00a0grandis  and  C.\u00a0megalocarpus  than under  Z.\u00a0gilletii . Highest numbers of termites and centipedes were found under  E.\u00a0grandis  after 16 years of cultivation. These findings support the importance of a diverse tree cover in agricultural landscapes to conserve soil macrofauna communities and the contribution of their activity to soil ecological functions.", "keywords": ["Eucalyptus grandis", "570", "Spatial variation", "Croton megalocarpus", "0401 agriculture", " forestry", " and fisheries", "04 agricultural and veterinary sciences", "Zanthoxylum gilletii", "15. Life on land", "Organic resource quality", "Soil biodiversity"]}, "links": [{"href": "https://doi.org/10.1016/j.soilbio.2017.04.016"}, {"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.2017.04.016", "name": "item", "description": "10.1016/j.soilbio.2017.04.016", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.soilbio.2017.04.016"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2017-09-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Organic+resource+quality&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=Organic+resource+quality&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=Organic+resource+quality&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=Organic+resource+quality&offset=2", "hreflang": "en-US"}], "numberMatched": 2, "numberReturned": 2, "distributedFeatures": [], "timeStamp": "2026-05-26T13:16:36.215707Z"}