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Coastal Bermudagrass Forage Production and Chemical Composition as Influenced by Potassium Source, Rate, and Frequency of Application 1
Author(s) -
Adams William E.,
White A. W.,
McCreery R. A.,
Dawson R. N.
Publication year - 1967
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1967.00021962005900030012x
Subject(s) - forage , loam , agronomy , fodder , environmental science , growing season , composition (language) , chemical composition , zoology , chemistry , biology , soil water , soil science , linguistics , philosophy , organic chemistry
The influence of K source, rate, and frequency of application was studied on intensively managed ‘Coastal’ bermudagrass grown on Cecil sandy loam soil. The N, P, and K contents of the forage and the forage production were not influenced by the chloride or sulfate source of K. The 185 kg/ha K rate applied as KCl in 4 equal splits—at the initiation of spring growth and after each of the first 3 harvests—produced about 15,700 kg/ha of forage and the most efficient K utilization. Efficiency was reflected by (i) more uniform seasonal forage distribution and (ii) a more uniform K content (average 1.5%) throughout the growing season as contrasted with applying all the K in the spring. This management practice of splitting the K application increased the kilograms of forage produced per centimeter of rainfall by 14% and the efficiency of applied K by 14%. The K‐Ca‐pyrophosphate source produced significantly more forage with a significantly lower K content than either the sulfate or chloride sources of K. One hundred eighty‐five kg/ha of K applied in four equal splits, rather than at one time, doubled the exchangeable K in the surface 15 cm of soil, produced earlier spring growth of the Coastal bermudagrass, and a higher forage yield in the first harvest.