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Correlation of Phosphorus Soil Test Values With Rice Yields in Thailand¹

ABSTRACT

The Bray P-2 soil test was applied to Thailand rice soils, and the values obtained were correlated with rice yields according to the expression log (A — y) = log A — c₁b₁ — c log x. The calculated and obtained yields of rice for the various soil test values and phosphorus fertilizer rates are reported. Comparisons of the obtained and calculated yields show that the Bray P-2 soil test values correlate with rice yields and that the test can be used on the rice soils of Thailand.

¹ Contribution from the Department of Agronomy, University of Illinois, Urbana. Part of a thesis submitted in partial fulfillment of the requirements of the M. S. Degree at the University of Illinois.

² Chief, Soil Analysis Section, Department of Agriculture, Bangkok, Thailand; former Soils Advisor to USOM Thailand and now with International Minerals and Chemical Corp., Skokie, Illinois; and Professor of Soils, University of Illinois, respectively.

Received for publication August 7, 1962. Accepted for publication January 7, 1963.