不同水肥处理对冷季型草坪草返青的影响

Effect of irrigation and fertilization at different level on regreening of cold-season turfgrass

用裂区实验研究了不同的灌水量和不同肥料处理对草坪草返青期的影响,测定了盖度和叶绿素含量。结果表明,每周灌水量15 mm时,草坪生长正常,当灌水量达到20 mm时比灌水量为5 mm时可提前返青14 d;并且氮磷肥配合施用有助于草坪返青,在灌水量较少时(5 mm和10 mm)效果尤为显著。施肥量为5 gN/m2时,草坪返青时间提前,叶绿素含量增加,叶色浓绿。叶面喷施3%尿素溶液(施肥量为1.25 gN/m2)处理效果不明显。灌水量为20 mm配合施用5 gN/m2对提早草坪返青和增加叶绿素含量最为有效。

The effects of irrigation and fertilization on the regreening of cold-season turfgrass, which has been established for one year, were studied through measuring the turf coverage and chlorophyll content in leaf. The results showed that irrigation at level of 15 mm per week could maintain the normal growth of turfgrass and the turfgrass was in good condition when it was 20 mm per week. The regreening date of turfgrass was 14 days earlier at 20 mm than 5 mm. Compared with sole urea application, the turfgrass regreening could be more effectively improved by applying urea together with phosphate fertilizer, especially at the low level of irrigation (3 mm and 10 mm). The increase of the coverage and chlorophyll content was obvious at 5g N/m^2 of application rate. But urea-spraying with 3% concentration did not show significant effect. It could be concluded that the treatment of 20 mm irrigation and 5 N g/m^2 of fertilization was the best for turfgrass regreening.