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Abstract
A field study was conducted for two years to evaluate 9 MAP fertilizers produced from the major sources of PR deposits located in Florida, Idaho and North Carolina compared with reagent grade MAP. Sources varied in chemical composition and had 81 to 100% of the A.O.A.C. available P water soluble. Each source was applied to a Norfolk (Typic Paleudults) and a Hartsells(Typic Hapludults) soil at rates to supply 0, 29 and 59 kg P ha−1. Forage yields and P concentrations in harvested forage were increased by the application of P (P ⩽ 0.05) to both soils during the two year study. The concentration of P in harvested forage was affected by the source of MAP only on the Hartsells soil in 1988. Nitrogen was not affected by the source MAP in any of the forage samples tested. Yield differences among sources were observed only in 1987 on the Norfolk soil and in 1988 on the Hartsells soil. Performance of the fertilizers was not related to the percentage of water soluble P or the content of metallic elements.
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