Abstract
The efficiency of two forms of phosphate — polyphosphate and orthophosphate — was compared at different levels of phosphorus on two zinc-deficient soils. On both soils, polyphosphate showed its superiority in drymatter production compared with diammonium phosphate. This difference appears mainly due to a difference in the reaction of these two forms with soil zinc. Presence of polyphosphate in soil leads to the liberation of soil zinc susceptible to ammonium acetate extraction, probably through the formation of a complex between polyphosphate and soil zinc. On the contrary, the reaction of diammonium phosphate with soil zinc rendered the latter less available and resulted in a decrease of dry-matter production. The differences in the two forms were marked particularly in the absence of applied zinc.
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