| A turf-type perennial ryegrass(Lolium perenne L cv. Pinnacle) was used for overseeding into Matrella grass(Zoysia matrella Mem), hybrid Bermuda grass(Cynodon dactylon X Cynodon transvaalensis) and St. Augustine grass(Stenotuphrum secundatum(Walt.) Kuntze.) turf in autumn in Nanjing, China. The effect of sowing rate, sowing date and cutting height of warm-season turf grasses on the growth of perennial ryegrass before winter, turf establishment rate, perennial ryegrass over-wintering rate and the turf quality were studied. When the warm-season turf grass returning green in spring, the effect of cutting height of ryegrass on the death rate of perennial ryegrass and the warm-season turf grass green returning rate were studied too. Meanwhile, the differences of three warm-season overseeding turfs were also studied in this experiment.The resulteds showed that overseeding perennial ryegrass into the Matrella grass(Zoysia matrella Merr.), hybrid Bermuda grass(Cynodon dactylon X Cynodon transvaalensis) and St.Augustine grass(Stenotuphrum secundatum(Walt.) Kuntze.) turf in autumn in Nanjing prolonged the green period of the warm-season turfs.Overseeding rate is the key factor that affected the turf establishment rate before winter. Higher sowing rate resulted in higher plant density, faster turf establishment rate and green period linkage rate, but leaded to less tillers and thinner plant of the perennial ryegrass.Earlier sowing date and lower cutting height of warm-season turf grasses resulted in more tillers, stronger plant, better growth situation and faster turf establishment rate of the perennial ryegrass. The establishment rate of overseeding turf cut by 2cm was faster than that cut by 3cm of warm-season turf grasses, and the establishment rate cut by 3cm was faster than by 5cm.In warm-season grass green returning stage, lower spring cutting height of the perennial ryegrass resulted in faster species changing rate of the overseeding turf. The warm-season grasses green returning rate in the turf with 2cm cutting height was significantly faster than that with 3cm.The effects of different warm-season turf on the ryegrass growth situation, the turf establishment rate, and the green period linkage rate of the overseeding turf were significantly different. The effects of Augustine grass turf on the ryegrass growing in the seedling stage were the greatest, its fresh biomass weight above ground and tillers was the least, and the turf establishment rate and green period linkage rate were slow; The effects of Matrella grass turf on the ryegrass ever more than that of hybridBermuda grass turf, the growing situation of the ryegrass in the seedling stage, turf establishment rate and turf green period linkage rate had significant difference from other two turfs.In warm-season grasses green returning stage, ryegrass delayed the green returning date of three different warm-season turfs, but the effect was different. In Augustine grass overseeding turf, the death rate of ryegrass was most quickly, and the ryegrass had the least effect on the green returning of Augustine grass; in the hybrid Bermuda grass overseeding turf, the ryegrass death rate was significantly greater than that in the Matrella grass overseeding turf, but there is no significant difference on the grass green returning rate between Matrella grass and hybrid Bermuda grass.In the turf establishment stage before winter and in the warm-season turf grasses green returning stage after spring, the turf quality of different overseeding turf was different, the Augustine grass overseeding turf was worst, but the Matrella grass overseeding turf and the hybrid Bermuda grass overseeding turf showed no significant difference.Overseeding warm-season turfs with cutting height of 2cm or 3cm and with sowing rate of 20g/m2 or 30g/m2 in October in Nanjing, the Matrella grass turf and hybrid Bermuda grass turf prolonged its green period to a whole year. When sowing rate reached to higher level of 30g/m2, the Augustine grass turf prolonged its green period to...
|
PDF Full Text Request