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This article in SSSAJ

  1. Vol. 27 No. 1, p. 61-65



Effects of Temperature and Moisture on Phosphorus Uptake from a Calcareous Saskatchewan Soil Treated with Several Pelleted Sources of Phosphorus1

  1. J. D. Beaton and
  2. D. W. L. Read2



The effects of temperature, moisture, and P source during the initial soil-fertilizer reaction period on subsequent P uptake by oats were investigated in a growth chamber. Phosphorus-treated soil with moisture adjusted to four different tensions was stored at 5°, 16° and 27°C. for 1 week and for 7 weeks. Following these storage intervals, P uptake by oats was measured using a shortterm method.

Uptake of P from soil treated with mono- and diammonium phosphates was greater following reaction of the fertilizer with soil at 5°C. than at either 16 or 27°C. No significant differences between 16° and 27° were observed.

Moisture tension during the I-week reaction period did not influence P uptake. Following the 7-week reaction period, uptake of P was favored by the 2.0-bar moisture tension treatment. It was lowest from soil reacted at 0.4 bar. Water-soluble sources such as monocalcium phosphate and mono- and diammonium phosphates were the most sensitive to differences in moisture.

Availability of the source decreased in the order mono-ammonium phosphate > diammonium phosphate > mono-calcium phosphate > dicalcium phosphate dihydrate > anhydrous dicalcium phosphate > check.

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