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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 Hybrids 1
Author(s) -
Gallaher Raymond N.,
Parks W. L.,
Josephson L. M.
Publication year - 1972
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1972.00021962006400050029x
Subject(s) - hybrid , potassium , agronomy , loam , human fertilization , biology , potash , yield (engineering) , fertilizer , horticulture , zoology , chemistry , soil water , ecology , materials science , organic chemistry , metallurgy
Three corn ( Zea mays L.) genotype groups including: inbreds T101, T105, T1ll, T115; 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 yield 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.