Fertilizer evaluation of monoammonium and diammonium phosphates by means of pot cultures
1950
MacIntire, W.H. | Winterberg, S.H. | Clements, L.B. | Sterges, A.J.
Under the ideal conditions imposed in the greenhouse, the unique Wilson Dam diammonium phosphate registered as an effective source of NH4 on soils of adequate calcium content and on limestoned or dolomited soils. Rational-rate incorporations of that phosphate should not prove harmful to seedling emergence. When the moisture content of a soil is such as to preclude undue localized concentration of solutes, the two phosphates of ammonium should register identically in the effectiveness of their nitrogen contents, when PO4 adjustment is provided. In the greenhouse experiments, the parallel incorporations of the two ammonium phosphates were maintained under moisture control. It does not follow, however, that under field conditions of indeterminate rainfall, the two materials will behave in identical manner as to chemical and biochemical transitions, or that either material would induce a "salt effect" under adverse climatic conditions. It may be that diammonium phosphate can be used advantageously in effecting enrichment and desired balances in manufactured fertilizers, and the present findings may have suggestive value as to such inclusions and possible utility of the stabilized binary ammonium phosphate for direct applications. The findings do not commit the authors as to the advisability of the commercial production of diammonium phosphate, or to advocacy of its use as a separate fertilizer.
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