Effects of different soil water treatments with reclaimed water irrigation on quality and physiological and biochemical characteristics of lawn

In order to the tension of urban water resources for the purpose of expanding the reuse of sewage and insuring good quality of urban lawn, the pot experiments of blue grass irrigated with reclaimed water under different water treatments were conducted. Six irrigation treatments were conducted: proper irrigation with fresh water(K), full irrigation with reclaimed water(RFI), proper irrigation with reclaimed water(RPI), light water stress irrigation with reclaimed water(LWS), medium water stress irrigation with reclaimed water(MWS), severe water stress irrigation with reclaimed water(SWS). The irrigation start-point is 70%fc(field water capacity), 80%fc, 70%fc, 60%fc, 50%fc, 40%fc, respectively. For six treatments, irrigation amount for an irrigation event was the same. The results showed that the water treatment had a significant effect on the tiller-development process and the texture. In order to obtain thick lawn, the soil water content should be kept over 60%fc. Once the soil water content was lower than 50%fc, the growth of blue grass was affected. The proline content was the most sensitive to drought stress. With the increase of water stress, the proline content was significantly increased. The result indicated that the proline content was correlated with the soil water content. With a lengthening of growing season the low temperature had a negative effect on turf grass growth.