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This study was conducted to find the effects of using PGR of trinexapac-ethyl on incline, which requires wide surface treatment.This study focused on finding the more effective way of PGR treatment based on the results of different amount of water treatment. The following are the results, In terms of turf length, we controlled the most when we used 150ml of water per ㎡, 250ml per ㎡ and non- treatment of water respectively. But, there could not find much difference between 150ml and 250 ml of water. In addition, there was not much difference between the PGR treatment and non-treatment after 4 weeks. In result of visual quality, 150ml of water scored highest, followed by non-treatment, and 250 ml respectively. I hope this study helps superintendent to find more effective way of applying PGR on the incline.