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This article in AJ

  1. Vol. 60 No. 5, p. 467-469
    Received: Oct 20, 1967

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Method for Predicting Potassium Uptake by Grain Sorghum1

  1. Billy W. Hipp and
  2. Grant W. Thomas2



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).

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