Potassium Rates and Sources for Coastal Bermudagrass
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During the past few years stands of 'Coastal' Cynodon dactylon have been reduced even though recommended rates of fertilizer have been applied. Many of the soils tested have been low in K. Coastal bermudagrass was fertilized with 9 K treatments on Cuthbert fine sandy loam (Typic Hapludult; clayey, mixed, thermic) and Darco fine sand (Grossarenic Paleudult loamy, siliceous, thermic) soils for 3 yr. Potassium treatments included rates of 0, 139, and 278 kg K/ha as KCl in single and split applications. Also, sulfur-coated muriate of potash and sulfur-coated potassium sulfate were applied at both 139 and 278 kg K/ha. Results indicate that in the long term, soil K would be depleted by high yields of Coastal bermudagrass with the K rates used in this study.-from Authors
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Nelson, L. R., Keisling, T. C., & Rouquette, F. M.