西洋芝栽培の基礎的研究 (第1報) 種子の発芽及び生育に及ぼす鎮圧効果について

抄録

In this study, the authors made some experiments on the germination of the seeds of American and European lawn grasses (Kentucky bluegrass, colonial bentgrass-Astoria bent and Highland bent, redtop, Bermudagrass, Chewings fescue and Italian ryegrass) in Japan and repression effects on their growth, and the following results obtained.
(1) According to the size and weight of the seeds, plants were arranged as follows:
Size: Italian ryegass>Chewings fescue>Kentucky bluegrass>redtop>Bermudagrass>colonial bentgrass.
Weight: Italian ryegrass>Chewings fescue>Kentucky bluegrass>Bermudagrass>redtop>colonial bentgrass.
(2) In germination percentage, Chewings fescue, Italian ryegrass, redtop and Astoria bent were good, Highland bent and Bermudagrass were somewhat bad, and Kentucky bluegrass was the worst. As the seeds of Kentucky bluegrass and redtop became old, so much their germination percentages became low. Bermudagrass showed the highest percentage in autumn of the second year.Chewings fescue showed the highest germination percentage in spring of the third year, and so showed Italian ryegrass. The result of the experiment shows that most of American and European lawn grases have dormant period of some duration. Except a few specics, the seeds of American and European lawn grasses are available after the preservation of 2 or 3 years.
(3) The result of reprssion experiment were as follcws.
By the repression after sowing, the growth of American and European lawn grasses were quickened. Their weight (fresh and dry measure), the height of the plants, the amount of stems and stolons, the length and amaunt of roots increased. The best results were obtained in the following case.