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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

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.

Key Words: Regression analysis • Yield equation • Soil test • Ear leaf K • Genotype

² Formerly Graduate Student in Agronomy, University of Tennessee, (presently Graduate Student in Agronomy, University of Georgia); and Professors of Plant and Soil Science, University of Tennessee, respectively.

Received for publication January 14, 1972.