氮素用量对狗牙根营养体建坪效果的影响

Nitrogen rate effects on the establishment of bermudagrass from stolons

为了了解不同氮素用量对狗牙根营养体建坪效果的影响,以邯郸狗牙根和保定狗牙根为供试材料,设每半月施用0 g/m^2、1 g/m^2、2 g/m^2和4 g/m^2氮。结果显示:随氮素用量增加,狗牙根建坪期的草坪盖度明显增大,成坪速度加快,4 g/m^2氮处理下邯郸狗牙根和保定狗牙根的成坪天数分别为30 d和32 d,比不施氮处理分别缩短9 d和10 d;匍匐茎生长速率随氮素用量增加而显著加快,2个供试品种4 g/m^2氮处理的平均匍匐茎生长速率达到1.27 cm/d,分别是不施氮和1 g/m^2氮处理的2.1倍和1.6倍;施用氮素可提高狗牙根叶片叶绿素含量,改善草坪色泽和外观质量,供试品种4 g/m^2氮处理的草坪外观质量评分分别较不施氮处理高1.7分和1.9分;2 g/m^2氮处理的狗牙根成坪速度和草坪外观质量与4 g/m^2氮处理无显著差异,但4 g/m^2氮处理明显增加了草屑累积量,不利于草坪养护。综合考虑,在试验土壤条件下,采用狗牙根匍匐茎建植草坪时,以每半月施用2 g/m^2氮为宜。

Effects of different nitrogen rates on turf establishment of bermudagrass from stolons were studied taking Baoding bermudagrass and Handan bermudagrass as research objects.Nitrogen was applied at 0,1,2,4 g/m^2 every half month.It was indicated that the turfgrass cover,growth rate of stolon,and establishment speed increased significantly as the nitrogen rate increased.The establishment speeds of Handan bermudagrass and Baoding bermudagrass were 30 days and 32 days at 4 g/m^2 respectively,9 days and 10 days less than that of the N-unapplied treatment;the average stolon growth rate of both cultivars was 1.27 cm/d,which was 2.1 times and 1.6 times of N-unapplied treatment and 1 g/m^2 N treatment.Application of nitrogen increased the content of chlorophyll and improved visual turf quality,and the turf visual quality ratings of Handan bermudagrass and Baoding bermudagrass at 4 g/m^2 were 1.7 and 1.9 higher respectively than the N-unapplied treatment.The establishment speed and turf quality had no significant difference between treatments of 2 g/m^2 and 4 g/m^2,but the clipping yield at 4 g/m^2 was much more than that at 2 g/m^2.For turf establishment of bermudagrass from stolons,applying N at 2 g/m^2 every half month was suggested for the soil as used in this study.