Relative values of some nitrogenous fertilizers
Withers, W.A., Fraps, G.S.
Relative values of some nitrogenous fertilizers - Raleigh 1900 - 13-22 p. - Nitrogen, Fertilizers North Carolina Agriculture Experiment Station. Bulletin No. 176 .
Relative values of some nitrogenous fertilizers - Raleigh 1900 - 13-22 p. - Nitrogen, Fertilizers North Carolina Agriculture Experiment Station. Bulletin No. 176 .