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Variability in Results from Greenhouse Pot Experiments Comparing Phosphorus Rates and Sources¹

Synopsis: Highly significant decreases were found in C.V. with increases in mean yields of dry matter by corn, small grains, and grasses. Error mean squares and standard errors per pot increased with mean yields. Variability in uptake of P was equal to or greater than for yields of dry matter by the various crops. Stands of plants and method of mixing phosphates affected variability.

² Agronomist. Credit is due S. H. Winterberg (deceased) and L. B. Clements for conduct of the experiments at Knoxville, and to J. D. DeMent, L. B. Clements, C. M. Hunt, B. N. Bradford, and others, at Wilson Dam.

Received for publication May 12, 1958.