{"type": "FeatureCollection", "features": [{"id": "10.1007/s11104-009-0044-8", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:15:06Z", "type": "Journal Article", "created": "2009-06-15", "title": "Spatial Patterns Of P Fractions And Chemical Properties In Soils Of Two Native Shrub Communities In Senegal", "description": "Two shrub species (Piliostigma reticulatum (D.C.) Hochst (Caesalpinioideae) and Guiera senegalensis J.F. Gmel (Combretaceae) are commonly found in farmers\u2019 fields at varying densities in semi-arid Senegal and throughout the Sahel where soils have chronically low phosphorus (P) availability. It seems plausible that shrub litter and the rhizospheres could influence P fractions and other chemical soil properties that affect crop productivity. Thus, a study was done at two sites, on the distribution of inorganic and organic soil P pools, organic C levels, and pH in soil beneath and outside the canopies of P. reticulatum and G. senegalensis (0-30 cm depth). Both sites had low total P ranging from 64 mg P kg\u22121 to 135 mg P kg-1, and low extractable PO4 (resin Pi) (1\u20136 mg P kg\u22121) with P fractions dominated by NaOH-P. Organic P (Po) made up about 50% of total P, and most of the organic P (>60%) was found in the NaOH-P fractions. The labile P, particularly bicarb-Po was higher in soil beneath shrub canopies (8.4 mg P kg \u22121), than outside the canopy (6.2 mg P kg \u22121). Similarly, C, N and P to a lesser extent, were more concentrated beneath shrub canopies. P. reticulatum soil was dominated by the NaOH-Po fraction, whereas G. senegalensis had higher bicarb-Po at one of the study sites. An index of biologically available organic P (Bicarb-Po) / (Bicarb-Po + Bicar-Pi + Resin Pi) was > 60% and indicates that biological processes represent an important part of P cycling in these shrub ecosystems. The differential ability of shrubs in modifying soil chemical properties under their canopies has major implications for biogeochemical cycling of nutrients and C in sandy soils of semi arid Sahelian ecosystems.", "keywords": ["2. Zero hunger", "550", "Total C", "04 agricultural and veterinary sciences", "15. Life on land", "01 natural sciences", "630", "Canopy soil", "Semi-arid", "Sahel", "0401 agriculture", " forestry", " and fisheries", "Shrubs", "P fractions", "0105 earth and related environmental sciences"], "contacts": [{"organization": "Dossa, E. L., Diedhiou, S., Compton, J. E., /Assigbets\u00e9, Komi, Dick, R. P.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1007/s11104-009-0044-8"}, {"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/s11104-009-0044-8", "name": "item", "description": "10.1007/s11104-009-0044-8", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1007/s11104-009-0044-8"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-06-16T00:00:00Z"}}, {"id": "10.1071/sr08108", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:18:35Z", "type": "Journal Article", "created": "2009-02-18", "title": "Tillage System Affects Phosphorus Form And Depth Distribution In Three Contrasting Victorian Soils", "description": "<p>  Major changes in tillage practices have occurred over the past 2 decades across the diverse range of soil types and rainfall zones that characterise cropping systems in southern Australia. However, there has been little corresponding change in the management of nutrients, especially phosphorus (P). This study investigated the effects of tillage and crop rotations on the stratification and transformation of P in soil profiles from 3 tillage/rotation trials encompassing 3 agro-ecological zones of southern Australia. Soil samples were collected from field trials at Longerenong (Vertosol, average rainfall 420\uffe2\uff80\uff89mm), Walpeup (Calcarosol, rainfall 325\uffe2\uff80\uff89mm), and Rutherglen (Chromosol, rainfall 650\uffe2\uff80\uff89mm) in Victoria. Soil samples from various depths were sequentially analysed for organic and inorganic P fractions. Phosphorus accumulated in the surface soil (0\uffe2\uff80\uff930.1\uffe2\uff80\uff89m) across all sites and tillage practices/rotations studied but the proportion of P in different chemical fractions varied markedly among soil types and tillage practice/rotation. In the sandy Calcarosol, a greater proportion of fertiliser P was transformed into labile (resin-P) forms, whereas it tended to accumulate in non-labile pools in the finer textured Vertosol and Chromosol. The effects of tillage and crop rotation were generally confined to the topsoil with P strongly stratified in the topsoil in direct-drill and zero-tillage treatments compared with conventional tillage. The implications for management of P fertilisers in Victorian cropping systems are discussed. </p>", "keywords": ["2. Zero hunger", "Soil N", "0503 (four-digit-FOR)", "050304 Soil Chemistry (excl. Carbon Sequestration Science)", "Crop rotation", "Long-term trials", "0401 agriculture", " forestry", " and fisheries", "Agro-ecological zone", "04 agricultural and veterinary sciences", "Soil type", "15. Life on land", "P fractions", "Tillage systems"], "contacts": [{"organization": "Tang, Caixian., Vu, Dang Thanh., Armstrong, R. D.,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.1071/sr08108"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Soil%20Research", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1071/sr08108", "name": "item", "description": "10.1071/sr08108", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1071/sr08108"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2009-01-01T00:00:00Z"}}, {"id": "10.4067/s0718-95162013005000069", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-13T16:22:19Z", "type": "Journal Article", "created": "2013-12-06", "description": "We conducted a 3-year field experiment on an Anthrosol paddy soil to investigate changes in crop yield, P uptake and soil organic phosphorus (P) fractions after 3 years of conventional tillage (CT) conversion to no-tillage (NT) under a rape - rice rotation in central China. Treatments were established following a split-plot design of a randomized complete block with tillage practice as the main plot and fertilizer as the sub-plot treatment. The yields of rape and rice ranged from 1378 to 2264 kg ha-1 and from 5895 to 9453 kg ha-1 across 3 years, respectively. Moreover, P uptake for rape and rice (aboveground) varied from 3.9 to 10.4 kg ha-1 and from 9.5 to 32.0 kg ha-1, respectively. Fertilization significantly enhanced crop yields and P uptake, but tillage did not affect the yields and P uptake. Fertilization significantly increased total P concentrations, acid phosphatase activity, Bray-1 P and labile organic P in the 0-5 cm soil layer. Compared to the CT treatments, the NT treatments had significantly higher acid phosphatase activity, total P, Bray-1 P, total organic P and organic P fractions in the 0-5 cm soil layer but lower organic P fractions in the 5-20 cm soil layer. Therefore, our results suggest that short-term NT does not enhance organic P concentrations in the 0-20 cm soil layer, and only improve P availability on the soil surface.", "keywords": ["2. Zero hunger", "0301 basic medicine", "0303 health sciences", "03 medical and health sciences", "Fertilization", "P uptake", "tillage practices", "organic P fractions", "yield", "6. Clean water"], "contacts": [{"organization": "Zhang, Z.S, Cao, CG, Cai, M.L, Li, C.F,", "roles": ["creator"]}]}, "links": [{"href": "https://doi.org/10.4067/s0718-95162013005000069"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Journal%20of%20soil%20science%20and%20plant%20nutrition", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.4067/s0718-95162013005000069", "name": "item", "description": "10.4067/s0718-95162013005000069", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.4067/s0718-95162013005000069"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2013-01-01T00:00:00Z"}}], "links": [{"rel": "self", "type": "application/geo+json", "title": "This document as GeoJSON", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=P+fractions&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=P+fractions&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=P+fractions&", "hreflang": "en-US"}, {"rel": "last", "type": "application/geo+json", "title": "items (last)", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items?keywords=P+fractions&offset=3", "hreflang": "en-US"}], "numberMatched": 3, "numberReturned": 3, "distributedFeatures": [], "timeStamp": "2026-04-15T03:18:22.089282Z"}