{"type": "FeatureCollection", "facets": {"type": {"type": "terms", "property": "type", "buckets": [{"value": null, "count": 2}, {"value": "Journal Article", "count": 1}]}, "soil_chemical_properties": {"type": "terms", "property": "soil_chemical_properties", "buckets": [{"value": "soil nutrient availability", "count": 3}]}, "soil_biological_properties": {"type": "terms", "property": "soil_biological_properties", "buckets": []}, "soil_physical_properties": {"type": "terms", "property": "soil_physical_properties", "buckets": []}, "soil_classification": {"type": "terms", "property": "soil_classification", "buckets": []}, "soil_functions": {"type": "terms", "property": "soil_functions", "buckets": []}, "soil_threats": {"type": "terms", "property": "soil_threats", "buckets": []}, "soil_processes": {"type": "terms", "property": "soil_processes", "buckets": []}, "soil_management": {"type": "terms", "property": "soil_management", "buckets": []}, "ecosystem_services": {"type": "terms", "property": "ecosystem_services", "buckets": []}}, "features": [{"id": "10.1016/j.apsoil.2007.12.011", "type": "Feature", "geometry": null, "properties": {"updated": "2026-04-04T16:15:46Z", "type": "Journal Article", "created": "2008-02-20", "title": "Changes In Soil Enzymes Related To C And N Cycle And In Soil C And N Content Under Prolonged Warming And Drought In A Mediterranean Shrubland", "description": "Open AccessPeer reviewed", "keywords": ["Soil protease", "2. Zero hunger", "13. Climate action", "Soil ammonium availability", "Soil \u03b2-glucosidase", "Climate change", "0401 agriculture", " forestry", " and fisheries", "Soil urease", "04 agricultural and veterinary sciences", "15. Life on land", "Soil nitrate availability", "6. Clean water"]}, "links": [{"href": "https://doi.org/10.1016/j.apsoil.2007.12.011"}, {"rel": "related", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/Applied%20Soil%20Ecology", "name": "related record", "description": "related record", "type": "application/json"}, {"rel": "self", "type": "application/geo+json", "title": "10.1016/j.apsoil.2007.12.011", "name": "item", "description": "10.1016/j.apsoil.2007.12.011", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/10.1016/j.apsoil.2007.12.011"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date": "2008-06-01T00:00:00Z"}}, {"id": "327b8820-6d15-4852-b6f6-6cb717eee6fa", "type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [-180.0, 90.0], [180.0, 90.0], [180.0, -90.0], [-180.0, -90.0]]]}, "properties": {"themes": [{"concepts": [{"id": "geoscientificInformation"}], "scheme": "https://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_TopicCategoryCode"}], "updated": "2022-11-03T10:09:22", "language": "eng", "title": "Soil Nutrient Retention Capacity (HWSD)", "description": "On the basis of soil parameters provided by the Harmonized World Soil Database (HWSD) seven key soil qualities important for crop production have been derived, namely: nutrient availability, nutrient retention capacity, rooting conditions, oxygen availability to roots, excess salts, toxicities, and workability. Soil qualities are related to the agricultural use of the soil and more specifically to specific crop requirements and tolerances. For the illustration of soil qualities, maize was selected as reference crop because of its global importance and wide geographical distribution.\n\nNutrient retention capacity (SQ2)\n\nNutrient retention capacity is of particular importance for the effectiveness of fertilizer applications and is therefore of special relevance for intermediate and high input level cropping conditions.\nNutrient retention capacity refers to the capacity of the soil to retain added nutrients against losses caused by leaching. Plant nutrients are held in the soil on the exchange sites provided by the clay fraction, organic matter and the clay-humus complex. Losses vary with the intensity of leaching which is determined by the rate of drainage of soil moisture through the soil profile. Soil texture affects nutrient retention capacity in two ways, through its effects on available exchange sites on the clay minerals and by soil permeability.\n\nThe soil characteristics used for topsoil are respectively: Organic Carbon (OC), Soil Texture (Text), Base Saturation (BS), Cation Exchange Capacity of soil (CECsoil), pH, and Cation Exchange Capacity of clay fraction (CECclay). Soil pH serves as indicator for aluminum toxicity and for micro-nutrient deficiencies.\n\nThe most limitingof these soil characteristic is combined with the average of the remaining less limiting soil characteristics to estimate nutrient retention capacity SQ2.\n\nNote that the classes used in the Soil Quality evaluation are:\n\n1: No or slight limitations\n\n2: Moderate limitations\n\n3: Sever limitations\n\n4: Very severe limitations\n\n5: Mainly non-soil\n\n6: Permafrost area\n\n7: Water bodies\n\nRemember that classes are qualitative not quantitative. Only classes 1 to 4 are corresponding to an assessment of soil limitations for plant growth. Class 1 is generally rated between 80 and 100% of the growth potential, class 2 between 60 and 80%, class 3 between 40 and 60%, and class 4 less than 40%.", "formats": [{"name": "GeoTIFF"}, {"name": "WWW:DOWNLOAD-1.0-http--download"}, {"name": "OGC:WMS-1.3.0-http-get-map"}, {"name": "WWW:LINK-1.0-http--link"}], "keywords": ["harmonized world soil database", "soil quality", "Soil Nutrient availability", "Tag_soil", "HiH_SOIL", "World"], "contacts": [{"name": "Ronald Vargas", "organization": "Food and Agriculture Organization of the UN", "position": null, "roles": ["pointOfContact"], "phones": [{"value": null}], "emails": [{"value": "GSP-Secretariat@fao.org"}], "addresses": [{"deliveryPoint": [null], "city": null, "administrativeArea": null, "postalCode": null, "country": null}], "links": [{"href": null}]}]}, "links": [{"href": "http://www.fao.org/docrep/018/aq361e/aq361e.pdf", "name": "Report: Harmonized World Soil Database Version 1.2 February 2012", "protocol": "WWW:DOWNLOAD-1.0-http--download", "rel": null}, {"href": "https://data.apps.fao.org/map/gsrv/gsrv1/gsoc/wms?service=WMS&version=1.3.0&request=GetCapabilities", "name": "gsoc:sq2", "description": "HWSD - Soil Nutrient retention capacity", "protocol": "OGC:WMS-1.3.0-http-get-map", "rel": "information"}, {"href": "https://storage.googleapis.com/fao-maps-catalog-data/geonetwork/gsoc/SQ/sq2.tif", "description": "Download - SQ2 (TIFF)", "protocol": "WWW:LINK-1.0-http--link", "rel": null}, {"rel": "self", "type": "application/geo+json", "title": "327b8820-6d15-4852-b6f6-6cb717eee6fa", "name": "item", "description": "327b8820-6d15-4852-b6f6-6cb717eee6fa", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main/items/327b8820-6d15-4852-b6f6-6cb717eee6fa"}, {"rel": "collection", "type": "application/json", "title": "Collection", "name": "collection", "description": "Collection", "href": "https://repository.soilwise-he.eu/cat/collections/metadata:main"}], "time": {"date-time": "2022-11-03T10:09:22Z"}}, {"id": "e00c65cd-7577-4ebe-a888-5eaf7930acf5", "type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[-180.0, -90.0], [-180.0, 90.0], [180.0, 90.0], [180.0, -90.0], [-180.0, -90.0]]]}, "properties": {"themes": [{"concepts": [{"id": "geoscientificInformation"}], "scheme": "https://standards.iso.org/iso/19139/resources/gmxCodelists.xml#MD_TopicCategoryCode"}], "updated": "2022-11-03T10:00:19", "language": "eng", "title": "Soil Nutrient Availability (HWSD)", "description": "On the basis of soil parameters provided by the Harmonized World Soil Database (HWSD) seven key soil qualities important for crop production have been derived, namely: nutrient availability, nutrient retention capacity, rooting conditions, oxygen availability to roots, excess salts, toxicities, and workability. Soil qualities are related to the agricultural use of the soil and more specifically to specific crop requirements and tolerances. For the illustration of soil qualities, maize was selected as reference crop because of its global importance and wide geographical distribution.\n\nThis soil quality is decisive for successful low level input farming and to some extent also for intermediate input levels. Diagnostics related to nutrient availability are manifold. Important soil characteristics of the topsoil (0-30 cm) are: Texture/Structure, Organic Carbon (OC), pH and Total Exchangeable Bases (TEB). For the subsoil (30-100 cm), the most important characteristics considered are: Texture/Structure, pH and TEB.\n\nThe soil characteristics relevant to soil nutrient availability are to some extent correlated. For this reason, the most limiting soil characteristic is combined in the evaluation with the average of the remaining less limiting soil characteristics to represent soil quality SQ1.\n\nNote that the classes used in the Soil Quality evaluation are:\n\n1: No or slight limitations\n\n2: Moderate limitations\n\n3: Sever limitations\n\n4: Very severe limitations\n\n5: Mainly non-soil\n\n6: Permafrost area\n\n7: Water bodies\n\nRemember that classes are qualitative not quantitative. Only classes 1 to 4 are corresponding to an assessment of soil limitations for plant growth. 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