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

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Abstract
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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