"The Phosphorus concentration of the exuded sap of corn as a measure of the available phosphorus in the soil."; "Pierre, W. H. (William Henry), 1898-", "Pohlman, G. G. (George Gordon), 1902-"; "Soils--Phosphorus content.", "Corn--Analysis.", "Sap.", "Phosphorus in agriculture."; "Pohlman, G. G. (George Gordon), 1902-", "Pierre, W. H. (William Henry), 1898-"; "1933"; "Journal article reprint from: Journal of the American Society of Agronomy, v.25:no.2 (1933:Feb.)."; ""; "P17740"; "pec"; "Phosphorus in agriculture.", "Sap.", "Soils--Phosphorus content.", "Corn--Analysis."; "14256"; .