Effects Of Water Stress And Phosphorus On Growth Of Kentucky Bluegrass

Turf is gained unprecedented attention and recognization because of its important function for maintaining ecological balance, beautifying living environment, and boosting the development of economy and sports. But much water will be expended in turf establishment and management which are consequentially conflicted with lack of water resource supply. In addition, turf quality and its function exertion are directly influenced by fertilization, and serious environmental problem will be resulted from improper fertilization. So the utilization of water and nutrient of turf will be profoundly influenced by the interaction between water and nutrient. In this article, effect of water stress and phosphorus on growth of Kentucky bluegrasss was studied for affording the theoretical gist of rational irrigation and fertilization of turf aiming at the problem of water and fertilizer resource lack and environmental contaimination.In this experiment, water consumption was reduced by high drought stress, there was no effect of phosphorus addition on water consumption. Color and uniformity quality of evening treatment was significantly reduced by drought stress, and was alleviated by phosphorus addition. The tillering difference was increased with phosphorus addition under no or medium drought stress. Clipping fresh weight and total fresh weight, clipping dry weight and total dry weight, stubble fresh and dry weight, and shoot and root total dry weight were reduced with increase of time and extent of drought stress, and were all increased with phosphorus addition. Clipping water content was reduced by drought stress, and was increased by phosphorus addition. Water content of Midnight was higher than that of Brilliant under high drought stress. Grass root was mainly located at the upper layer, and root of upper layer was increased by phosphorus addition under no drought stress. Upper layer root was reduced, and middle and under layer root were increased by drought stress, the promoting effect of phosphorus addition on middle and under layer root was higher than that of upper layer root. Ratio of root to shoot of Midnight under low phosphorus treatment and Brilliant was increased under high drought stress, and there was no effect of phosphorus addition on ratio of root to shoot.