Effects Of Rootzone Composition On Performanance Of Golf Green In Bei Jing

Golf green is a relative week research field of turfgrass science in our country, which is crucial for the development and intercommunition of athletic sports. Rootzone physical properties have great effects on performance of sport turf. A good rootzone will produce a high quality of sport turf, and significantly save the cost of latter maintenance, which have the basic and long-term constraints to turf sward characteristics and turf playing quality. The experiment includes four treatments: soil-based rootzone(T1), pure sand rootzone(T2), partically amendes sand rootzone(T3), fully amended sand rootzone(T4). The plots were constructed within 2×3㎡.The results showed that performance of sport turf could be objectively, quantitatively and comprehencively assessed by using an Integrated Rate Methodology(IRM) model through computing the Comprehensive Performance Index(CPI). The main results are as follows:1. There were many factors effecting rootzone physical properties. Soil saturated hydraulic conductivity and infiltration rate of new turf were not up to standards of USGA. With sand content increasing, soil saturated hydraulic conductivity, infiltration rate and air-filled porosity increased. Compared to sand-base rootzone, total porosity and water-filled porosity of soil rootzone were more, and bulk denstity was less. pH of four rootzones were alkaline that is mainly caused by irrigation water.2. Soil physical properties affected sward characteristics of sport turf, especially to performance and root growth of turf. The main percentage of root mass were 75%-90% in the 0-50mm depth, and root distribution was in the 30cm of surface, which agreed with the majority of researchers. Root mass and root distribution of sand-base rootzone were better than soil-based rootzone.3. By , IRM could comprehencively, quantitatively and objectively assess, dynamic monitor and appear a decision-making tool in seasonal management of sport turf. 4. Peat offen was used to amend sand-base rootzone. T3 could be instead of T4 which was recommended by USGA. The CPI of four rootzones was: T3(0.89) > T4(0.71) > T2(0.68) > T1(0.56).