{"properties":[{"id":"ph","name":"Soil pH","description":"Acidity or alkalinity under a stated extraction method.","standard_unit":"pH","accepted_aliases":["pH","reaction","ph_h2o"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"supported"},{"id":"organic_carbon","name":"Organic carbon","description":"Carbon associated with soil organic matter.","standard_unit":"%","accepted_aliases":["SOC","soil organic carbon","oc"],"conversion_notes":"Mass-fraction units may be converted only with an explicit formula; organic matter is not converted to carbon without a stated method.","method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"organic_matter","name":"Organic matter","description":"Reported soil organic matter mass fraction.","standard_unit":"%","accepted_aliases":["OM","som"],"conversion_notes":"OpenSoil does not infer organic carbon from organic matter.","method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"supported"},{"id":"sand","name":"Sand","description":"Sand-sized mineral fraction under the provider's particle-size method.","standard_unit":"%","accepted_aliases":["sand_total","sandtotal"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"supported"},{"id":"silt","name":"Silt","description":"Silt-sized mineral fraction under the provider's particle-size method.","standard_unit":"%","accepted_aliases":["silt_total","silttotal"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"supported"},{"id":"clay","name":"Clay","description":"Clay-sized mineral fraction under the provider's particle-size method.","standard_unit":"%","accepted_aliases":["clay_total","claytotal"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"supported"},{"id":"cation_exchange_capacity","name":"Cation exchange capacity","description":"Capacity of soil to retain exchangeable cations under a stated method.","standard_unit":"cmol(+)/kg","accepted_aliases":["CEC","cec7","ecec"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"bulk_density","name":"Bulk density","description":"Oven-dry soil mass per bulk volume under stated water tension and fragment treatment.","standard_unit":"g/cm³","accepted_aliases":["BD","dbthirdbar"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"supported"},{"id":"total_nitrogen","name":"Total nitrogen","description":"Total soil nitrogen under a stated analytical method.","standard_unit":"%","accepted_aliases":["TN","nitrogen_total"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"available_phosphorus","name":"Available phosphorus","description":"Operationally defined extractable phosphorus.","standard_unit":"mg/kg","accepted_aliases":["P","available P","extractable phosphorus"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"electrical_conductivity","name":"Electrical conductivity","description":"Conductivity of a stated soil-water extract.","standard_unit":"dS/m","accepted_aliases":["EC","conductivity"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"supported"},{"id":"calcium","name":"Calcium","description":"Reported calcium concentration or exchangeable amount.","standard_unit":"mg/kg","accepted_aliases":["Ca"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"magnesium","name":"Magnesium","description":"Reported magnesium concentration or exchangeable amount.","standard_unit":"mg/kg","accepted_aliases":["Mg"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"potassium","name":"Potassium","description":"Reported potassium concentration or exchangeable amount.","standard_unit":"mg/kg","accepted_aliases":["K"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"sodium","name":"Sodium","description":"Reported sodium concentration or exchangeable amount.","standard_unit":"mg/kg","accepted_aliases":["Na"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"iron","name":"Iron","description":"Reported iron concentration under a stated extraction or total analysis.","standard_unit":"mg/kg","accepted_aliases":["Fe"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"manganese","name":"Manganese","description":"Reported manganese concentration under a stated extraction or total analysis.","standard_unit":"mg/kg","accepted_aliases":["Mn"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"zinc","name":"Zinc","description":"Reported zinc concentration under a stated extraction or total analysis.","standard_unit":"mg/kg","accepted_aliases":["Zn"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"boron","name":"Boron","description":"Reported boron concentration under a stated extraction or total analysis.","standard_unit":"mg/kg","accepted_aliases":["B"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"selenium","name":"Selenium","description":"Reported selenium concentration under a stated analytical method.","standard_unit":"mg/kg","accepted_aliases":["Se"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"},{"id":"arsenic","name":"Arsenic","description":"Reported arsenic concentration under a stated analytical method.","standard_unit":"mg/kg","accepted_aliases":["As"],"conversion_notes":null,"method_dependency_warning":"Values can depend on preparation and analytical method; compare only when methods, units, depth intervals, and data kinds are compatible.","status":"planned"}],"warning":"A canonical name and unit do not make unlike methods, depths, or data kinds scientifically comparable."}