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TURFGRASS SCIENCE

Kentucky Bluegrass Growth Responses to Trinexapac-Ethyl, Traffic, and Nitrogen

^a Crop and Soil Environmental Sciences, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061
^b Dep. of Horticulture and Landscape Architecture, Colorado State Univ., Fort Collins, CO 80523

* Corresponding author (EErvin{at}vt.edu)

Understanding the whole-plant response of Kentucky bluegrass (Poa pratensis L.) to the plant growth regulator (PGR) trinexapac-ethyl (TE) [4-(cyclopropyl--hydroxy-methylene)-3,5-dioxo-cyclohexane-carboxylic acid ethyl ester] while subjected to traffic and variable N rates would facilitate recommendations regarding its safe and effective use. The objectives of this study were (i) to investigate the extent and duration of TE-induced shoot growth suppression on Kentucky bluegrass and determine any interactive traffic or N effects, and (ii) to investigate if TE-induced reductions in shoot growth affect tillering, rooting, and quality of Kentucky bluegrass, and determine any interactive traffic or N effects. Trinexapac-ethyl (0.27 kg ha^-1) was applied to main plots three times a year at 6-wk intervals. Traffic was applied to subplots with a cleated roller. Four increasing rates of a slow-release N source were applied annually to sub-subplots. Trinexapac-ethyl consistently reduced clippings by 1 to 2 wk after treatment (WAT), with maximum suppression occurring at 3 to 4 WAT. Greater suppression occurred for July and August application dates relative to May. Traffic consistently reduced clippings and tiller density. Tiller density was increased by TE in 1996. Higher annual N did not, in general, affect tiller density, root mass, or quality. Repeated TE application did not affect Kentucky bluegrass root mass. Trinexapac-ethyl did not affect quality, while traffic consistently reduced it. Quality was poorest at the three highest N-rates under TE and traffic during the last treatment cycle of 1997. These results suggest caution when using TE on highly trafficked Kentucky bluegrass.

Abbreviations: LAI, leaf area index • PGR, plant growth regulator • TE, trinexapac-ethyl • WAT, weeks after treatment

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