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This article in SSSAJ

  1. Vol. 28 No. 3, p. 409-412
    Received: July 24, 1963
    Accepted: Sept 13, 1964

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The Influence of Soil Temperature and Phosphorus Fertilizers of Different Water-Solubilities on the Yield and Phosphorus Uptake by Oats1

  1. V. W. Case,
  2. N. C. Brady and
  3. D. J. Lathwell2



The effect of root zone temperatures of 15°, 20°, and 25°C. and P sources having water-solubilities of 1, 25, 50, and 100% were evaluated in two greenhouse experiments using oats as a test crop. Oats were grown for 43 days and height, dry weight, and P uptake were determined.

Height response to added P was greatest at 15°C. and least at 25°C. The effects of temperature on height were greatest where no P was applied. There was a marked response in forage yields and in P uptake to increasing amounts of applied P and to increasing soil temperature. Root yields and P uptake, however, were highest at 15°C. and lowest at 25°C. In both tops and roots the temperature effect was greater at high rates of P than at low rates of P application.

In the winter experiment using ammoniated superphosphates, yields and P uptake by oat forage decreased as the percentage of water-soluble P decreased, except at the lowest percentage of water-soluble P where yield and P uptake were not related to water-solubility of P. In the fall experiment where mixtures of MCP and DCP were used, the source of P had little effect on yield and P uptake.

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