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A Field Comparison of Eight Phosphate Fertilizers¹

Synopsis: Differences in yields of corn from different phosphate sources were small, and in nearly all cases statistically insignificant. Fused phosphate produced a significantly higher yield of hay than any other source. Differences in yield from other treatments were insignificant. Regular grade superphosphate, concentrated superphosphate, and dicalcium phosphate produced the highest yields of potatoes; rock phosphate produced only about 60% as high potato yield as these even at double the P₂O₅ rate. The other materials were intermediate. Tests at the close of the experiment showed the most extractable phosphorus in plots receiving rock phosphate, fused phosphate, or calcium metaphosphate.

² Professor and Assistant Professor of Agronomy and Associate Professor of Agricultural Chemistry, respectively.

Received for publication May 4, 1956.