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This article in AJ

  1. Vol. 56 No. 6, p. 555-558
    Received: Feb 15, 1964

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Phosphorus Availability in Reddish Brown Lateritic Soils. I. Laboratory Studies1

  1. L. A. Alban,
  2. S. Vacharotayan and
  3. T. L. Jackson2



NH4F extracted Al-phosphates plus monoor di-calcium phosphate, NaOH extracted Fe-phosphates, and H2SO4 extracted calcium phosphates remaining in the sample. Adding mono-calcium phosphorus to 2 soils increased the NH4F- and the NaOH-extractable P but had no effect on the H2SO4-extractable P. NH4F- and H2SO4-extractable P in soil correlated best with P content of oats and clover. Uptake of P by oats and clover during a cropping period was significantly correlated with loss of NH4F-extractable P from the soil.

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