About: http://webisa.webdatacommons.org/172928094

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Currently, measurements of soil fertility status, such as pH, phosphorous and potassium levels, are generally done by collecting soil samples on a grid for laboratory analysis.
http://www.w3.org/ns/prov#wasQuotedFrom	usda.gov