Studies on growth and damage-ratio by treading-pressure of Japanese lawn grass planted in various periods under the different Arakida-clay content and turfing-method

Abstract

In these studies, the authors investigated and observed the growth and damage-ratio by treading pressure of Japanese lawn grass (Chu-shiba, one variety of Zoysia matrella MERR.) planted in various periods under the different Arakida-clay contents and turfing-methods.
The results obtained are as follows:
(1) In case of non-tread, with increased mixture of Arakida-clay, height of plants and cutting weight are decreased, while leaves become lighter in colour, and increase its hardiness.
(2) In case of tread, with increased mixture of Arakida-clay, the damage-ratio of Japanese lawn grass is rather decreased, but the hardiness of soil should be increased, so that their growth becomes worse.
(3) In case of over treed, the damage-ratio of lawn is remarkable. Especially, by tread after cutting, the damage-ratio is more remarkable than what is by only tread.
(4) Lawn grass for sports ground must be planted not later than June or July, and we should not be able to good results after August.
(5) Damage-ratio by tread is remarkable in high growth period.
(6) In the method of Hira-bari, lawn grass grows in same condition as in Meji-bari, Suji-bari and Ichimatsu-bari, In Sujimakishiba and Makishiba, it grows better than above case.
(7) In case of tread, the wider no-turfing space, the more remarkable the damage-ratio.
(8) In 120 times treading/80cm × 80cm a day generally, upper parts of lawn grass are damaged perfectly after for 2 weeks. After the treading for one month, it needs at least 3 or 4 weeks to recover.