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This article in AJ

  1. Vol. 52 No. 5, p. 247-250

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Initial and Residual Effects of Rock Phosphate and Superphosphate1

  1. E. C. Doll,
  2. H. F. Miller and
  3. J. F. Freeman22



After 26 and 27 years at the Campbellsville and Greenville experiment fields, respectively, yields of corn, wheat, and hay were generally maintained or increased on superphosphate, rock phosphate, and rock phosphate residual plots, but decreased on superphosphate residual plots. Initial availability of rock phosphate tended to be lower than that of concentrated superphosphate.

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