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Published in Soil Sci Soc Am J 25:207-210 (1961)
© 1961 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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The Influence of Phosphorus Fertilization and Moisture on Growth and Nutrient Absorption by Spring Wheat: I. Plant Growth, N Uptake, and Moisture Use1

J. F. Power, D. L. Grunes and G. A. Reichman2

ABSTRACT

The effects of stored soil moisture, seasonal precipitation, and P fertilization upon spring wheat growth were studied in a field experiment under controlled moisture conditions on a Chestnut soil in eastern Montana. Plant growth, grain yields, and nutrient uptake were proportional to available moisture and were increased by P fertilization. A uniform yield increase from P fertilization was measured under all moisture conditions on this relatively low P soil, with no interactions between moisture supplies and P fertilization.

Phosphorus fertilization had no consistent effect upon total moisture use at any stage of growth. However, at soft dough and harvest, P fertilization increased the plant material produced per unit of moisture used. Correlation coefficients between plant growth or nutrient uptake and moisture use were extremely high as the crop approached maturity, for both fertilized and nonfertilized treatments.

NOTES

1 Contribution from the Soil and Water Conservation Research Division, ARS, USDA, Montana Agr. Exp. Sta., Bozeman cooperating. Montana Agr. Exp. Sta. Journal Series Paper No. 478. Presented before Div. IV, Soil Science of America, Nov. 19, 1959, at Cincinnati, Ohio.

2 Soil Scientists, Western Soil and Water Management Research Branch, SWCRD, ARS, USDA, Sidney, Mont., Mandan, N. Dak., and Mandan, N. Dak., respectively.

Received for publication August 8, 1960. Accepted for publication November 11, 1960.






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