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This article in SSSAJ

  1. Vol. 37 No. 3, p. 379-381
     
    Received: Sept 13, 1972
    Published: May, 1973


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doi:10.2136/sssaj1973.03615995003700030020x

Diffusion of Zinc in Soils as a Function of Applied Zinc, Phosphorus, and Soil pH1

  1. James R. Melton,
  2. Samuel K. Mahtab and
  3. Allen R. Swoboda2

Abstract

Abstract

Self-diffusion coefficients, D, of 65Zn were determined in two Texas soils. In the Norwood loam, a calcareous soil of pH 8.2, the effect of applied P and Zn on diffusion coefficients was studied. As the applied P was raised from 0 to 240 ppm, the D value obtained at 0 ppm Zn decreased significantly from 11.73 × 10-11 to 8.57 × 10-11 cm2/sec; at 40 ppm Zn, the D value decreased significantly from 28.51 × 10-11 to 16.33 × 10-11 cm2/sec. Zinc diffusion doubled as the applied Zn was increased from 0 to 40 ppm at all levels of applied P. In the Nacogdoches sandy loam, a soil initially of pH 6 but subsequently raised to pH 7.2 and 7.9 by liming, there was little difference between the D values obtained at pH 7.2 and 7.9. When the applied Zn was increased from 0 to 20 ppm, the D value increased from 5.35 × 10-11 to 7.83 × 10-11 cm2/sec at pH 7.2 and from 3.97 × 10-11 to 6.26 × 10-11 cm2/sec at pH 7.9. However, D values obtained at pH 6 were much larger than those obtained at pH 7.2 and 7.9. As the Zn level was raised from 0 to 20 ppm at pH 6, the D value increased from 19.90 × 10-11 to 19.53 × 10-9 cm2/sec. It appears from this study that the effect of Zn and pH on diffusion of Zn is greater than that of applied P.

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