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Residual Effects of Acid Phosphate and Rock Phosphate 1
Author(s) -
Baker W. G.
Publication year - 1925
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1925.00021962001700030008x
Subject(s) - residual , citation , phosphorite , library science , phosphate , chemistry , mathematics , computer science , algorithm , biochemistry
There is a growing need in the Middle West for phosphate fertilizers. With a more general recognition of this need comes the question, " how long will an application of phosphorus benefit crops ? To answer this question, the effect of applications of phosphorus carriers on ~crops grown on various soils should be determined over a period of years following the application. Investigational reports are meagre concerning the length of time residual effects will occur after an application of a phosphate fertilizer. Some writers mention the duration of residual effects, but they do not give any data showing these effects. In planning systems of farming and soil management where it would be advantageous to apply the fertilizer only once or twice during the rotation, it is important to know how long the phosphate will have an effect on crop growth. The work reported in the following pages was planned to throw some light on the question by determining the residual effects of acid phosphate and rock phosphate on some typical Iowa soils in the field and greenhouse.