Chapter 21. S. C. Chang. 1965. Phosphorous and potassium tests in rice soils. Pages 373-381. In: The Mineral Nutrition of the Rice Plant. Proceedings of a Symposium at IRRI, Los Baños, Laguna, Philippines, February 23-28, 1964, Johns Hopkins Press, Baltimore, Maryland, USA, 494 pages.

Keywords: Oryza sativa, phosphorous test of rice soils, potassium test of rice soils, and interpretation of test values for fertilizer recommendations