Field test of different sources of phosphorus
Noll, C.F., Gardner, F.D., Irvin, C.J.
Field test of different sources of phosphorus - Pennsylvania 1930 - 1-14 p. - Field, Sources, Phosphorus Pennsylvania Agricultural Experiment Station. Bulletin No. 252 .
Field test of different sources of phosphorus - Pennsylvania 1930 - 1-14 p. - Field, Sources, Phosphorus Pennsylvania Agricultural Experiment Station. Bulletin No. 252 .