影响暖季型草与黑麦草交播草毯返青的因素

Factors Influencing Warm-season Turf Carpet Turning Green while Overseeding with Ryegrass

为解决无土生态基质交播草毯在长沙地区春季出现暖季型草返青困难的问题,对冷暖季型草交播草毯的潜在影响因素如暖季型草品种、暖季型草种植块径、黑麦草播种量及播种时间等进行了研究。结果表明：在养护管理得当的情况下,于休眠期（11-12月）种植暖季型草毯与其他时期播种的在返青方面无明显差别;对于暖季型草品种,天堂419或兰引三号（10-11月使用天堂419,12月使用兰引）具有更快的返青速度;将草茎单块面积增大有助于其春季返青;黑麦草播种量10月播种时应控制在10 g/m^2左右,往后逐渐增加量,12月可播种20 g/m^2,这样可保证次年3-4月黑麦草植株密度不会特别大。

In order to resolve the problem that the warm-season grass of soilless substrate overseeding turf carpet is difficult to turn green, some potential influencing factors, including warm-season grass species, warm-season grass planting block diameter, seeding rate and planting time of ryegrass were researched in this study. The results showed that with appropriate cultivation management, when warmseason grass was sown in crop resting period（November to December）, the turning green situation had no obvious difference with those sown in other period of times. In terms of warm-season grass species, TIFTON 419（sown in October to November） and Lanyin No.3（sown in December） were of higher turning green rate than that of others. Increasing the area of single planting block was beneficial for warm season grass turning green in spring. The sowing density of ryegrass should be around 10 g/m^2 in October, then be increased progressively and could reach 20 g/m^2 in December, which would ensure the plant density of ryegrass not being too large in the next March to April.