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Influence of Temperature and Moisture on Soil Phosphorus: II. Effect Prior to and During Cropping on Soil Phosphorus Availability for Millet¹

ABSTRACT

Millet was grown with and without added phosphorus at one temperature and moisture level on samples of two soils which had been incubated for 74 days at 23°, 2.7°, and –20.5° C. and at moistures of 40, 60 to 70 and 100 percent of field capacity. The higher the soil temperature prior to cropping, the greater was the yield of dry matter and phosphorus uptake. Soil moisture contents prior to cropping did not affect yield and phosphorus uptake. Millet was also grown at three soil moisture levels and at two soil temperatures. The effect depended on the accompanying temperature. The soil moisture level did not affect the yield and phosphorus uptake at a soil temperature of 16° C. but did affect it at a soil temperature of 21° to 33° C. during the cropping period. Response to phosphate in field trials with wheat was related to both temperature and rainfall during the growing season.

¹ Journal Paper No. 1534. Purdue University Agr. Exp. Sta. Contribution from the Department of Agronomy.

² Former graduate student, now Research Officer (soils), Canada Department of Agriculture, and Professor of Soils, Purdue University, respectively. The investigation was conducted by the senior author while on Educational Leave from the Canada Department of Agriculture.

Received for publication February 5, 1960. Accepted for publication May 9, 1960.