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TURFGRASS SCIENCE

Nitrogen Use in Tifway Bermudagrass, as Affected by Trinexapac-Ethyl

^a Dep. of Horticulture, Forestry, and Recreation Resources, Kansas State Univ., 2021 Throckmorton, Manhattan, KS 66506-5507
^b Crop Science Dep., North Carolina State Univ., 100 Derieux St. Box 7620, Raleigh, NC 27695-7620

^* Corresponding author (mfagerne{at}oznet.ksu.edu).

Nutrient movement from turfgrass systems into surface and ground water is a public concern. Data indicate that actively growing turf rapidly immobilizes applied N, thus restricting nutrient movement. It is possible, however, that growth suppression with plant growth regulators (PGRs) could reduce N demand and thus N uptake, resulting in greater leaching losses. An experiment was conducted with column lysimeters to investigate the effects of trinexapac-ethyl (TE) on nitrate leaching and N-use efficiency in Tifway bermudagrass (Cynodon dactylon x C. transvaalensis). The experiment was conducted in a growth chamber with day/night temperature set at 29/24°C and a 12-h photoperiod. Trinexapac-ethyl was applied twice at 4-wk intervals at 0.11 kg a.i. ha^–1. Ammonium nitrate (AN) was applied at 50 kg N ha^–1 2 wk after each TE application, and again 6 wk after the second TE application. Separate sets of columns received ¹⁵N-labeled AN for the first two applications. Irrigation was scheduled to provide a leaching fraction of 50%; leachate was collected after each irrigation and analyzed for nitrate and ammonium. Cumulative nitrate leaching was unaffected by TE after the first two N applications, but was reduced 60% by TE following the third N application. Trinexapac-ethyl reduced ¹⁵N allocation to clippings by 25% and increased ¹⁵N allocation to roots and rhizomes; total recovery of applied ¹⁵N in tissues was 65%. Results demonstrate chemical growth suppression with TE does not reduce N uptake or increase nitrate leaching from bermudagrass.

Abbreviations: AN, ammonium nitrate • ET, evapotranspiration • PGR, plant growth regulator • TE, trinexapac-ethyl

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