Inhibition of Shoot Growth in the Kentucky Bluegrass by Application of Mepiquat-Chloride

Young-Sun  Kim12,*   Hyeok-Jae  Heo1   Jeong-Ho  Youn3   Geung-Joo  Lee4,*   

1Division of Life & Environmental Science (Horticulture Major), College of Natural and Life Sciences, Daegu University, Gyeongsan 38453, Korea
2Institute of Basic Science, 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 evaluate the inhibition effect of mepiquat-chloride (MC) on the growth of Kentucky bluegrass (Poa pratensis) by investigating visual quality indices, shoot length and clipping yield. As compared with control, turf color index, chlorophyll index and visual quality in the Kentucky bluegrass treated with MC was not significantly different, meaning those was not affected on the damage of Kentucky bluegrass by MC application. While the shoot length of MC treatments was decreased by 11.7-13.4% on 28 day after treatment than that of control, clipping yield not significantly different. Compared with trinexapac-ethyl (RT), shoot length and clipping yield of MC treatments were not significantly different. The applying amount of MC was correlated with shoot length negatively (p<0.05). These results indicated that the MC application was inhibited the shoot elongation of Kentucky bluegrass, and that MC might be chosen another plant growth regulator applying to Kentucky bluegrass in the turfgrass management.

Figures & Tables

Fig. 1. Clipping yield of Kentucky bluegrass after application of mepiquat-chloride in pot experiment. Treatments were as follows; Control (non-treatment of plant growth regulator), RT (TE 0.01 a.i. g m; 2,500 fold dilution), HM (MC 0.033 a.i. g m; 2,000 fold dilution), RM (MC 0.066 a.i. g m; 1,000 fold dilution), DM (MC 0.132 a.i. g m; 500 fold dilution). TE and MC mean trinexapac-ethyl and mepiquat-chloride, respectively. TE and MCs were applied on Kentucky bluegrass on June 11 in 2019. Error bars indicates standard deviation and different letters indicates significant different at ≤0.05 level according to Duncan’s multiple range test.