Yield, N, and S Content of Corn as Affected by N and S Fertilization on Coastal Plain Soils1

Abstract

AbstractSince there is an increasing use of high analysis fertilizers containing very little sulfur, two field experiments were conducted to evaluate the S requirements of corn (Zea mays L.) grown on Coastal Plain soils under present management practices. The soils used were Goldsboro loamy sand (Aquic Paleudult) and Wagram loamy sand (Arenic Paleudult). Experiments consisted of a complete factorial arrangement of nitrogen rates (which varied from 56 to 224 kg/ha) and S rates (which varied from 0 to 66 kg/ha). Gypsum was used as the source of S. The hybrid ‘Pioneer 3369A’ was grown at both sites. Nitrogen fertilization had the largest effect on yield and N content of corn grain. The effects of S fertilization depended on the N supply. With 56 or 112 kg N/ha, S additions had no effect or depressed grain yields and N content. With 168 or 224 kg N/ha, S fertilization significantly increased grain yields and N content of corn grain. Total amounts of S accumulated by corn varied from 7 to 20 kg/ha depending on soil type, N, and S rates. Nitrogen fertilization had a larger effect than S fertilization in determining total S accumulation in grain and stover. This study indicated that additions of 30 to 60 kg S/ha to adequately N‐fertilized corn crops are likely to improve grain yield and quality of corn grown on Coastal Plain soils, particularly on those having deep sandy A horizons.