Effects of phosphorus and potassium fertilizers on the yield and botanical and chemical composition of seven grass-legume mixtures, 1952-1954 - Hunt, O. J.; Wagner, R. E.,; United States. Agricultural Research Service. ([Beltsville, Md.], U.S. Dept. of Agriculture, Agricultural Research Service, 1963)
https://www.biodiversitylibrary.org/bibliography/70313
Keywords: Fertilizers|Forage plants|