title: Ionic Species in Orthophosphate Absorption by Barley Roots.
authors.affiliation: SOIL AND WATER CONSERVATION RESEARCH BRANCH, AGRICULTURAL RESEARCH SERVICE, U. S. DEPARTMENT OF AGRICULTURE, BELTSVILLE, MARYLAND.
authors.forename: C E
authors.initials: CE
authors.lastname: Hagen
authors.forename: H T
authors.initials: HT
authors.lastname: Hopkins