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Response of Coastal Bermudagrass to Soil Applied Sulfur, Magnesium, and Potassium¹

A pot experiment was conducted using several acid sandy soils of Texas to determine their sulfur and magnesium requirements and the rapidity with which these elements can become limiting when using 400 ppm N and 200 ppm P. Potassium was applied at the rate of 50, 200, and 400 ppm K.

Yield of Coastal bermudagrass (Cynodon dactylon (L.) Pers.) was significantly increased (1% level) by the application of 32 ppm S. Magnesium at the rate of 48 ppm Mg and potassium above the rate of 50 ppm K did not affect yield significantly until the third harvest.

Sulfur content of the forage was increased only by the application of S. Magnesium content was increased by the application of Mg, but was decreased by the application of S and K. Potassium content was increased by the application of K and S and decreased by the application of Mg.

Key Words: Forage • Nutrient uptake • Sulfur deficiency

² Graduate assistant and Associate Professor, Texas A&M University, College Station; and Professor, Department of Agronomy, University of Kentucky, Lexington.

Received for publication February 2, 1972.