PHOSPHATE FERTILIZERS FOR THE TEXAS BLACKLANDS

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Abstract
Eleven phosphate fertilizers labelled with P32 were tested to detn. their relative availability to beans grown on Houston black clay and Susquehanna sandy loam in greenhouse tests. On Houston soil, superphosphate, double superphosphate, mono-Na phosphate, mono-K phosphate, mono-NH4 phosphate, mono-Mg phosphate and phosphoric acid were readily utilized, whereas di-Ca phosphate and tri-Ca phosphate were utilized hardly at all. Ammoniated superphosphate and Cametaphosphate were intermediate in availability. On Susquehanna soil, the relative order of availability was essentially the same except that di-Ca phosphate and tri-Ca phosphate were considerably more available than on the calcareous Houston soil.

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