<http://webisa.webdatacommons.org/prov/282620837>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/131378403> .
<http://webisa.webdatacommons.org/prov/456929332>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/131378403> .
<http://webisa.webdatacommons.org/131378403>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<iastate.edu> .
<http://webisa.webdatacommons.org/131378403>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/131378403>	<http://www.w3.org/ns/prov#value>	"In particular, if urea or other materials have a significant percentage of particles less than 1 mm it is difficult to throw very far with a spinner and a narrower swath is required." .