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This article in CS

  1. Vol. 42 No. 2, p. 507-512
     
    Received: Apr 24, 2001


    * Corresponding author(s): jbs@gnv.ifas.ufl.edu
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doi:10.2135/cropsci2002.5070

Tifway Bermudagrass Response To Potassium Fertilization

  1. J. B. Sartain *
  1. Soil and Water Science Dep., Univ. of Florida, P.O. Box 110510, Gainesville, FL 32611

Abstract

Potassium fertilization rates used for ‘Tifway’ bermudagrass [Cynodon dactylon (L.) Pers. × C. transvaalensis Burtt-Davy] vary greatly among turfgrass managers and there is no consensus as to the actual quantity required or as to the best Potassium (K) source to use. Effects of K source and rate on Tifway bermudagrass shoot and root growth, quality and tissue K concentration were studied in a 3-yr field study in Central Florida. Turf was grown on an Arredondo fine sand (loamy, siliceous, hyperthermic, Grossarenic Paleudult). Two K sources (KCl and K2SO4) were applied at 8 rates (0, 3.7, 7.4, 9.8, 14.7, 22, 29.4, and 36.8 g K m−2 90 d−1) in conjunction with N applied monthly at 4.9 g m−2 Potassium chloride produced a more rapid shoot growth than did K2SO4, but this effect may be linked to the N source. Bermudagrass shoot growth rate and tissue K concentrations were increased by K fertilization up to 7.4 g K m−2 90 d−1 There was no additional increases in either of the aforementioned parameters, regardless of the K level applied. Turfgrass quality and root weight were not influenced by K application. Greater root weight was observed during May, June, and July than August, September, and October. Observed turfgrass growth responses to Mehlich-1 extractable K levels suggest that 30 mg K kg−1 soil may be adequate for optimum growth. For an N application rate of 4.9 g m−2 mo−1, K fertilization levels above 9.8 g K m−2 90 d−1 probably will not enhance Tifway bermudagrass shoot and root growth, quality, or tissue K concentration.

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Copyright © 2002. Crop Science Society of AmericaPublished in Crop Sci.42:507–512.