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The Effect of Soil Clay Content on Phosphorus Uptake¹

ABSTRACT

Observations have been made that plants remove more P from soil high in clay than from sandy soils at a similar level of P. These observations led to a study of P uptake by snap beans (Phaseolus vulgaris) as a function of clay content of the soil. Three Virginia soils, with 10, 22.5 and 63.5% clay, were used. Snap beans were grown in a growth chamber and the tops were analyzed for P. It was found that the amount of P absorbed by the plants at a given soil solution level increased with clay content. The similarity of the results with acid soils to those obtained with calcareous soils by Olsen and Watanabe suggested that their prediction value for uptake might be employed. The agreement between relative uptake and predicted relative uptake was rather good. Clay content is indicated as a prime factor in P availability.

Key Words: soil texture • phosphorus availability

¹ A joint contribution from the Virginia Agr. Exp. Sta. and the Texas Agri. Exp. Sta.

² Formerly graduate assistant, Virginia Polytechnic Institute, now Plant Physiologist, Escuela Nacional de Agricultura, Chapingo, Mexico.

³ Professor of Soil Chemistry, Texas A&M University, College Station, Texas

Received for publication January 23, 1967. Accepted for publication March 16, 1967.