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Abstract

 

This article in AJ

  1. Vol. 52 No. 5, p. 247-250
     

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doi:10.2134/agronj1960.00021962005200050002x

Initial and Residual Effects of Rock Phosphate and Superphosphate1

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

Synopsis

Synopsis

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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