| In order to solve the problem that the turfgrass have a long scorch period in winter, the effect of irrigation and fertilization on the green period of turf established with 3 turfgrasses (Poa pratensis, Loliumperenne, Festuca rurba) were studied. This research is aimed to set up the best procedure of irrigation and fertilization which could prolong the turf green period in northwest area. The results indicated that: The regreening could be improved by 20 mm of irrigation per week at early March. The irrigation shouldn't be less than 15 mm per week even lack of water. Turfgrass greening date was earlier by using 5g N/m2 or N 2.5g·m2+P2O5 1.5 g/m2 which could increase chlorophyll and enhance photosynthesis. Moreover, the application of phosphorus fertilizer could significantly enable the earlier regreening of turfgrass if the irrigation was not enough. Meanwhile, the photosynthesis efficiency could be increased, but the content of chlorophyll in leaf could not be increased obviously. The physiological and biochemical indexes were stable in regreen period of turfgrass and the difference was not significant. With the air temperature falling, the turfgrass began to scorch in early November and totally scorched in the last ten-days of December. During this period, the physiological and biochemical indexes were changed distinctly, the contents of chlorophyll and catalase decreased, while the contents of raline, MDA and cell membrance permeability increased, especially the accumulations of proline and cell menbrance permeability. Turfgrass scorch could be delayed to the middle ten days of January next year by using nitrogen 5g/m2 at early September, October and November together with 20mm of irrigation per week. This treatment was able to prolong growing period and improve the sight effect and using value of turfgrass. |
