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TURFGRASS SCIENCE

Nitrogen/Potassium Fertilization Ratios for Bermudagrass Turf

^a Everglades Research and Education Center, Univ. of Florida, P. O. Box 8003, Belle Glade, FL 33430 USA
^b Ft. Lauderdale Research and Education Center, Univ. Florida, 3205 College Ave., Ft. Lauderdale, FL 33314 USA

ghs{at}gnv.ifas.ufl.edu

Turfgrass fertilizers often contain approximately one-half as much potassium (K) as nitrogen (N), on a weight basis. Since K fertilization has been shown to be very beneficial for turfgrass appearance and growth, higher rates of K fertilization, relative to N, have been suggested. The effect of K/N fertilization ratios on `Tifgreen' bermudagrass [Cynodon dactylon (L.) Pers. x C. transvaalensis Burtt-Davy] growth and quality was studied over a 3-yr period in south Florida for three rates of N fertilization. Severe K deficiencies were observed in the absence of K fertilization. However, increasing K fertilization beyond a K/N fertilization ratio of 0.5 to 1 had virtually no effect on turfgrass appearance, growth, on resistance to bermudagrass decline, or on root weight. Increasing K fertilization relative to N fertilization did not provide commensurate increases in tissue K.

Abbreviations: FLREC, Ft. Lauderdale Research and Education Center • Q1, Q2, Q3, Q4, Quarter 1, Quarter 2, Quarter 3, Quarter 4

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