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NOTES

Trinexapac-ethyl effects on kentucky bluegrass evapotranspiration

^a Dep. of Horticulture, 1-87 Agriculture Building, Univ. of Missouri, Columbia, MO 65211
^b Dep. of Horticulture and Landscape Architecture, Colorado State Univ., Fort Collins, CO 80523

Corresponding author (ErvinE{at}missouri.edu)

Many researchers have reported that trinexapac-ethyl [4-(cyclopropyl-hydroxy-methylene)-3,5-dioxo-cyclohexane-carboxylic acid ethylester] effectively reduces turfgrass leaf elongation and subsequent clipping production. Our hypothesis is that trinexapac-ethyl (TE) induced canopy growth and conductance reductions may also reduce turfgrass evapotranspiration (ET) rates. This study was conducted to determine if application of TE to mature, field-grown Kentucky bluegrass (Poa pratensis L. `NuStar') would result in reduced weekly ET rates as measured by weighing bucket lysimeters. A randomized complete block design was used to compare the weekly ET rate (mm week^-1) of Kentucky bluegrass (KBG) treated or not with TE (0.27 kg ha^-1). Weighing bucket lysimeters containing KBG were treated with TE three times per year at 6-wk intervals in 1995, 1996, and 1997. Trinexapac-ethyl reduced KBG weekly ET in 5 wk out of a total of 34 wk sampled over 3 yr. Higher ET rates were not correlated with weekly clipping production for either untreated or TE-treated KBG. Possible ET reductions, coupled with reduced clipping production, indicate TE is an effective tool for managing numerous turfgrass systems.

Abbreviations: ET, evapotranspiration • ET_o, grass reference evapotranspiration • KBG, Kentucky bluegrass • LAI, leaf area index • PGR, plant growth regulator • PVC, polyvinyl chloride • r_c, canopy resistance • TE, trinexapac-ethyl • WAT, weeks after treatment

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