Potassium, Boron, Nitrogen, and Lime Effects on Corn Yield and Earleaf Nutrient Concentrations1
- J. R. Woodruf,
- F. W. Moore and
- H. L. Musen2
Intensified production practices have included irrigation and higher-than-traditional rates of N and K to reach high yield goals for corn (Zea mays L.). Previous studies have shown that B is low in southeastern Coastal Plain soils and that additions of high rates of N, K, and lime to soils low in B may decrease B availability. This 3-yr factorial experiment was conducted on a Dothan loamy sand (Plinthic Paleudults) to examine the effects and interactions of B, K, N, and lime on corn yield and earleaf nutrient concentrations with the objective of better defining B needs of intensive corn production. Two levels of B (0 and 2.24 kg ha−1), K (131 and 317 kg ha−1), N (202 and 426 kg ha−1), and lime (0 and 1120 kg ha−1) were employed. Corn yields showed a positive response to N in 1982, a negative response to lime in 1983, and no response to individual factors in 1984. There was a trend in 1982 and 1984 toward less yield (average 18.2% less) where high K was added with no B, compared to where low K was added with no B. There was a significant B ✕ K interaction effect (P≤0.05) on yield in 1984, and the same effect (P≤0.01) appeared for the 3-yr combined analysis of variance. Earleaf B was influenced by N ✕ B interaction in 1982 and lime ✕ K interaction in 1984. The results showed that B fertilization was necessary to prevent yield reduction where high K fertilization was used.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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