Intensified production practices have included irrigation and higherthan-traditional rates of N and K to reach high yield goals for com (ZI!Il 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 (Piinthic 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-'), 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 X K interaction effect (P::50.05) on yield in 1984, and the same effect (P::50.01) appeared for the 3-yr combined analysis of variance. Earleaf B was influenced by N X B interaction in 1982 and lime X K interaction in 1984. The results showed that B fertilization was necessary to prevent yield reduction where high K fertilization was used.Additio111ll index words: Potassium-boron interaction, Leaf boron, Leaf potassium, Leaf calcium, Zea mays L., Irrigation.

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