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

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.

¹ Contribution from the Experimental Farm, Research Branch, Canada Department of Agriculture, Swift Current, Sask. Mr. A. Dueck Conducted the growth chamber operations and made the phosphorus analyses. Mr. L. Timushka translated V. P. Dadykin's paper. Presented before the Twelfth Western Phosphate Conference, March 22, 1962, at Reno, Nev.

² Formerly Physical Chemist, Soil Section, Experimental Farm, Swift Current, Sask.; now Soil Scientist, Research and Development Div., The Consolidated Mining and Smelting Company of Canada Limited, Trail, B.C.; and Irrigation Agronomist, respectively.