Growth Inhibition Responses of Kentucky Bluegrass after Applying Trinexapac-Ethyl Solution Diluted to Two Concentration

Young-Sun Kim1,2,*   Jeong-Ho Youn3   Geung-Joo Lee4,*   

11Division of Life and Environmental Science, Daegu University, Gyeongsan 38453, Korea
2Institute of Natural Sciences, Daegu University, Gyeongsan 38453, Korea
3Hanul Co., Ltd., Hapcheon 13206, Korea
4Department of Horticulture and Department of Smart Agriculture Systems, Chungnam National University, Daejeon 34134, Korea


This study was conducted to investigate influences of various trinexapac-ethyl (TE) application on growth inhibition and visual quality in Kentucky bluegrass (Poa pratensis L). Treatments were as follows; Control (Non-treatment), H100 (0.005 a.i. g m-2 100 mL-1), H300 (0.005 a.i. g m-2 300 mL-1), R100 (0.01 a.i. g m-2 100 mL-1) and R300 (0.01 a.i. g m-2 300 mL-1). Turf color index, chlorophyll index and visual quality of Kentucky bluegrass were not significantly different, so that not showed damages of TE application. Shoot length and clipping yield in TE treatments were decreased by its application amount, but unaffected by its diluting concentration. Compared to time treated TE, shoot length was decreased at June than May, and clipping yield increased. These results indicated that TE amount applied on Kentucky bluegrass decreased shoot elongation and clipping yield and its application concentration was unaffected on. Also, turfgrass growth was influenced by application time of TE.

Figures & Tables

Fig. 1. Clipping yield of Kentucky bluegrass in pot after application trinexapac-ethyl (TE). Treatments were as follows; Con (Non-treatment of TE), H100 (0.005 a.i. g m; 5,000 fold dilution), H300 (0.005 a.i. g m; 15,000 fold dilution), R100 (0.01 a.i. g m; 2,500 fold dilution), R300 (0.01 a.i. g m; 7,500 fold dilution). Application of TE was carried out on May 8 and June 4 in 2019. a-d: Means with the same letters within column are not significantly different by Duncan's multiple range test at P≤0.05 level.