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This article in AJ

  1. Vol. 59 No. 3, p. 247-250
     
    Received: Dec 10, 1966
    Published: May, 1967


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doi:10.2134/agronj1967.00021962005900030012x

Coastal Bermudagrass Forage Production and Chemical Composition as Influenced by Potassium Source, Rate, and Frequency of Application1

  1. William E. Adams,
  2. A. W. White,
  3. R. A. McCreery and
  4. R. N. Dawson2

Abstract

Abstract

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 KCI 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 uni.form 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.

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