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This article in AJ

  1. Vol. 64 No. 5, p. 645-647
    Received: Jan 14, 1972

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Effect of Levels of Soil Potassium, Fertilizer Potassium, and Season on Yield and Ear Leaf Potassium Content of Corn Inbreds and Hybrids1

  1. Raymond N. Gallaher,
  2. W. L. Parks and
  3. L. M. Josephson2



Three corn (Zea mays L.) genotype groups including: inbreds T101, T105, Till, TII5; their six possible single cross hybrids; and three double cross permutations were grown on a Hartsells loam soil at four rates of K fertilization for 3 years to evaluate their K requirements. The hybrids responded to higher rates of K fertilization than the inbreds. However, the leaf K values for the inbreds should be greater than the 1.5% critical level of hybrids for maximum yields. Seasonal variation in rainfall, temperature, and sunlight caused large differences in yield and ear leaf content of K. A quadratic regression model was fitted to yidd of corn and percent K content of the ear leaf for each genotype group. Results indicated that the model would be more useful in accounting for variation in yield and K concentration for double-cross hybrids than for single-cross hybrids or inbreds. The linear effect of fertilizer K accounted for more yield and ear leaf K content differences than any other factor studied.

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