The effectiveness of manure and commercial fertilizer in restoring the productivity of subsoils exposed by leveling
1950
Whitney, R.S. | Gardner, R. | Robertson, D.W.
A study was made of the comparative effectiveness of manure and commercial fertilizers on restoring the productivity of subsoils exposed by land leveling operations. The major factors involved in limiting the growth on the subsoils studied were a deficiency of available N and P. Both manure and commercial fertilizers were effective in producing practically normal yields of corn, sugar beets, and spring wheat in a very short time. Rather high rates of application were used. The importance of deep placement of phosphate was demonstrated.
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