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.
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