This Investigation was conducted to determine the rolling wear injury on Manila grass (Zoysia matrella).
The treatments applied were a factorial combination of number of passes and interval of rolling.(Tab.)
Soil hardness and visual rating of area (covered with green leaves, withered leaves and naked soil) were measured almost every 7 days. After three months' treatment, weight of stems, stolons and roots, length of stolons and number of stems were measured.
After the start of rolling, the soil was compacted due to the day passing. However after one month passed, increasing of soil hardness stopped at all plots, and soil hardness remained thereafter at the value de4ermined by rolling frequency per a day with small fluctuations without concerning total rolling frequency. In all plots of present experiments, the ratio of area covered with green leaves remained over 70% at the end of growing season, so it may be said that the turf will not completely weared within these frequency of rolling.(less than 30 times per a day)
Stolon growth of turfgrass is supressed by rolling. In the plots rolled everyday, maturing ather than elongation was supressed, and in the plots rolled every fourth day, elongation rather than maturing was more supressed on the contrary.
Weigt per unit length of stolons at the plots rolled every four days are similar to that at the controlled plots, but it was about 2/3 at the plot rolled every day compared with the weight at controlled plot.
The number of living and dead stems and traces of teared stems were counted. Total number of stems, including traces, was largest at the plots rolled everyday. But many stems had been teared at these plots because stolons had not efficiently matured. At the plots rolled every four days, fewer stems were initiated because the stolons had not sufficiently elongated. As the result, it was the plots group rolled every two days that had most living stems within three treatment groups of this experiment.
The weight of green leaves showep the same result.
It can be suid from this experiment that although the total number of rolling is same, the turf grass wear injury can be slightly reduced by setting no rolling day, however the injury will increase by excess rolling in one day by setting more days of repose.

View full abstract