Growth of `Tifway' Bermudagrass Following Application of Nitrogen and Iron with Trinexapac-ethyl

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  • 1 Crop and Soil Science Department, University of Georgia, Georgia Station, Griffin, GA 30223-1797

A field study was conducted to assess the effects of N and Fe with trinexapac-ethyl (TE) on established `Tifway' bermudagrass (Cynodon dactylon × C. transvaalensis) during 2 years at Griffin, Ga. There were no TE × Fe or N treatment interactions when applied in three applications at 4-week intervals each year. Combinations of Fe with TE improved turfgrass quality over TE alone at 1 to 2 weeks after each treatment. The improvement from Fe sources was 17 % higher with Sprint 300 and SoluPlex, 33% higher with Ferromec and LawnPlex, and 67% higher with ferrous sulfate. Vegetative suppression of `Tifway' bermudagrass at 14 weeks after treatment ranged from 46% in 1994 to 28% in 1995 when treated with TE at 0.1 kg·ha-1 in three applications at 4-week intervals. Neither N or Fe influenced vegetative growth when applied with TE. Chemical name used: 4 (cyclopropyl-α-hydroxy-methylene)-3.5-dioxocyclohexanecarboxlic acid ethyl ester (trinexapac-ethyl).

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