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Materials and Methods Soil type was a Fruitfield coarse sand soil with approximately 1.5 percent organic matter and soil pH of 6.0 (buffer pH of 7.0). A spring soil test reported 134 ppm P (very high), 98 ppm K (low), and 11 ppm S (low/medium) in the topsoil. Spring tillage included chisel plowing and disking. Pioneer P1324 hybrid corn seed was planted on May 7. Plant emergence was uniform and final stand counts averaged 31,000 plants/acre. Weed control was achieved by applying s-metolachlor + atrazine + mesotrione herbicide crop pre-emergence on May 13 and a post emergence application of glufosinate + atrazine on June 11. Potash (0-0-60) fertilizer was broadcast at a rate of 200 lb/acre on April 4. Total N (nitrogen) application for the season was 200 lb/acre and applied in split applications as dry urea broadcast on May 24 and liquid UAN through irrigation on July 2 and July 20. Plots were arranged in a randomized complete block design with four replications. A treatment plot consisted of six rows 50 ft long. Calcium sulfate (21% Ca, 17% S) was used as the sulfur source and banded between plot rows at rates equal to 10, 20, and 40 lb/acre sulfur on May 29. An irrigation water sample was collected in July for quality analysis by Texas A&M Water Testing Laboratory, College Station, Texas. Plant tissue sampling occurred on July 19 when corn was at the R1 growth stage by collecting leaves that were opposite and below the primary ear. Plant samples were sent to A&L Analytical Laboratories, Memphis, Tennessee, for nutrient concentration analysis. Yield determinations were made on October 16 by harvesting the center two rows of each plot.

Corn Response to Sulfur Fertilization when Grown on Irrigated Sandy Soil