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Long-Term Fertility Requirements of Coastal Bermudagrass, I. Potassium¹

Asbstract: A trial inwdving four levels of K on coastal bermudagrass was conducted over an ll-year period on a Eustis sand. Applied K increased yields by about one-third the first year with K deficiency becoming so acute on the K0 treatment in succeeding years as to virtually eliminate the stand on that treatment after the 7th year. Under low to moderate rates of applied K, the grass removed far more K than was applied. Roots penetrated to a depth of at least 24,t cm and exchangeable K was affected to a depth of 122 cm. K content of the forage declined linearly from the beginning to the end of the growing season underlow to intermediate levels of applied K. Optimum K content fluctuated widely both between and within growing seasons as did the degree of luxury consumption. Exchangeable K appears to be preferable to the strongacid method in identifying zones in this soil affected by the application of K. Neither method was effective in identifying snpplies of native K. Findings indicate that long-term trials with plants of this kind can be of value.

Key Words: Cyndadon • K content • removal • exchangeable K • strong-acid K • seasonal trends

² Professor of Soil Science, North Carolina State Univerity at Raleigh. The author wishes to express appreciation to J. R. Piland and his staff for the plant analyses, to the staff of the Soil Testing Laboratory, North Carolina Department of Agriculture for tlhe soil analyses, and to D. D. Mason and L. A. Nelson for the statistical treatment of the data.

Received for publication March 6, 1968.