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Master Exit Seminar
Presenter: Chenchen Gu
The Effect of Brushing on Creeping Bentgrass Putting Green Quality
Abstract: Brushing is a daily practice method for golf course turfgrass maintenance which is done to stand the turfgrass plant prior to being cut. Creeping bentgrass (Agrostis stolonifera) is the primary turfgrass species used on golf course putting greens, but has a prostrate growth habit. Brushing promotes vertically oriented leaf tissue, which helps the plant tolerate lower mowing heights. Greater vertical growth promotes higher shoot density, which helps reduce the competitive ability of some weeds. However, different frequency of brushing could lead to variation in the structure of the turfgrass leaves. The mechanical or abrasive nature of brushing potentially can cause physiological injury to the turfgrass plant. The objectives of this research are to evaluate the variation of the green speed as well as to quantify the fluctuations in physiological benefits or stress and to investigate the morphological changes due to brushing creeping bent grass putting greens throughout the growing season. The two-year experiment was conducted on a ‘Penncross’ creeping bentgrass putting green on native soil located at the Ohio Turfgrass Foundation Research and Education Facility. In first three months of the first year, the treatments consisted of two different brushing frequencies, brushing once a week and brushing three times a week with brushing unit set at 2.54 mm, with untreated control. However, there was no significant difference among those treatments. Therefore we adjusted our treatments to brushing three times a week and brushing five times a week with brushing unit set at 0.00 m and continued the treatments in the second year of research. We found improvement in turf leaf texture and faster green speed with brushing while the variation of photochemical efficiency is not significant until the maximum temperature got lower than 15℃. In 2014 we observed a thinner leaf blade that appeared to have less leaf moisture in the brushed treatment compared to un-treated treatment. In 2015 we found increase in green speed with all brushing treatments and the reducing of the amount of cuticle wax is significant where double cutting had the greatest effect (P=0.05) while no physiological stress was indicated by measuring photochemical efficiency.