Crop response surfaces and economic optima in fertilizer use
Heady, Earl O., Pesek, John T., Brown, W.G.
Crop response surfaces and economic optima in fertilizer use - Iowa 1955 - 291-332 p. - Iowa Agricultural Experiment Station. Research Bulletin No. 424 .
Fertilizers
Crop response surfaces and economic optima in fertilizer use - Iowa 1955 - 291-332 p. - Iowa Agricultural Experiment Station. Research Bulletin No. 424 .
Fertilizers