Effects of Temperature and Moisture on Phosphorus Uptake from a Calcareous Saskatchewan Soil Treated with Several Pelleted Sources of Phosphorus1
- J. D. Beaton and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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