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Method for Predicting Potassium Uptake by Grain Sorghum¹

A greenhouse experiment using nutrient solution culture with graded levels of K was used to determine the concentration of K required in grain sorghum leaves for optimum growth. It was determined that growth of grain sorghum is reduced if the leaf K concentration is much below 1.5% at the full bloom stage. A field study was made to relate soil K parameters from eight different soils to concentration of K in grain sorghum leaves at the full bloom stage of growth. The best method of predicting K uptake by plants included both solution K and exchangeable K. A correlation coefficient of 0.890 was obtained between percent K in leaves and solution K + log (1 + exchangeable K).

Key Words: potassium availability

² Assistant Professor, Lower Rio Grande Valley Research and Extension Center, Weslaco 78596, and Professor of Soil Chemistry, Department of Soil and Crop Sciences, College Station, Texas.

Received for publication October 20, 1967.