Inhibition Influences of Prohexadion Calcium on Growth of Creeping Bentgrass

Young-Sun Kim1,2,*   Eun-Hye Park1   

1Division of Life and Environmental Science, Daegu University, Gyeongsan 38453, Korea
2Institute of Natural Sciences, Daegu University, Gyeongsan 38453, Korea

Abstract

This study was conducted to investigate effects of prohexadione-calcium (PC) on the inhibition of shoot elongation, growth in creeping bentgrass (A. palustris H.), and PC’s effectiveness. Treatments were follows; Control, trinexapac-ethyl treatment (TE; TE 0.01 a.i. mL m-2 100 mL-1), half recommended amount of PC (HP; PC 0.005 a.i. mL m-2 100 mL-1), recommended amount of PC (RP; PC 0.01 a.i. mL m-2 100 mL-1) and double recommended amount of PC (DP; PC 0.02 a.i. mL m-2 100 mL-1). Turf color index, chlorophyll index and visual turfgrass quality of creeping betngrass after application PC were not significantly different in pot and plot experiment. In pot experiment, shoot length and clipping yield of PC treatments were decreased by 34-39% and 43-58%, respectively. As calculated with linear regression formula between day after PC treatment and shoot length, effectiveness of TE, HP, RP and DP was 43, 47, 48 and 63 days, respectively. These results indicated that PC application was inhibited from shoot elongation and turfgrass growth in creeping bentgrass, and unaffected on turfgrass damage. Also, it could replace prohexadione-calcium with trinexapac-ethyl as plant growth retardant in turfgrass management.

Figures & Tables

Fig. 1.Clipping yield of creeping bentgrass in pot after application prohexadione-calcium in pot test. Treatments were as follows; Control, TE (trienexapac-ethyl [TE] 0.01 a.i. g m 100 mL), HP (prohexadionecalcium [PC] 0.005 a.i. g m 100 mL), RP (PC 0.01 a.i. g m 100 mL), and DP (PC 0.02 a.i. g m 100 mL). TE and PCs were applied on June 11 in 2019, and clipping yield of PC treatments sampled on July 9. Error bars indicates standard deviation and different letters indicates significant different at P≤0.05 level according to Duncan’s multiple range test.