Abstract
Bouldin and Sample1 and Beaton and Read2 reported that uptake of phosphorus from calcareous soils was greater from monoammonium phosphate (MAP) than from diammonium phosphate (DAP) treatments. The formation of relatively unavailable reaction products was believed to be responsible for the differences observed in the latter work. Identification of the soil-fertilizer reaction products formed from MAP and DAP would assist in understanding the responses obtained with these materials since plants obtain most of their fertilizer phosphorus from such reaction products.
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