Study On The Fertilizers And Pesticides Leachate And Water Environment Impact Of Chongqing Golf Course

In this paper, the leaching characteristics of urea, potassium dehydrate phosphate, chlorothalonil and triadimefon used in golf green turfgrass; the impacts of fertilizer application amount, pesticide application amount and rainfall on the concentration of pollution factors in the leachate were studied by laboratory soil column leaching experimentation in the climatic conditions of Chongqing. Based on the laboratory simulate studies, the concentration of nitrate, nitrite, ammonia nitrogen, total phosphorus of artificial lake water of five golf courses in Chongqing were tested and analyzed; the water environment issues of golf in Chongqing area were analysis studied.The concentration of nitrate in the leachate rises significantly with the increasing of nitrogen fertilizer application amount; it was also affected by phosphorus fertilizer application amount, but not significant. If the application amount of nitrogen fertilizer on golf green turfgrass was controlled in 5.6g/m2 once, the pollution of the surface water by nitrate in the leachate can be ignored. The concentration of nitrite in the leachate is almost the same with different fertilization conditions during the whole year, and doesn't change with the seasons, even if the application amount of nitrogen fertilizer was 60g/m2 per year, it could also reach A class of Environment quality standards for landscape (GB-12941-91). The concentration of ammonia nitrogen relates to nitrogen fertilizer application amount and phosphorus fertilizer application amount, and changes with the different rainfall and seasons. With the increasing of leaching times, the concentration of ammonia nitrogen reached a peak in all processing, after that, it reduced gradually and stabilized. The application amount of phosphorus fertilizer can significantly affect the leaching of phosphorus. The concentration of total phosphorus in the leachate increased with the increasing of the phosphorus fertilizer application amount, it was also affected by seasons and rainfall. If the application amount of phosphorus fertilizer was controlled in 3.2g/m2 once, the pollution of the surface water by total phosphorus in the leachate can be ignored.The concentration of triadimefon in the leachate increased with the increasing of the triadimefon application amount, if the application amount was between 0.15-0.60 g/m2·once, taking 0.1mg/L as the critical value, the concentration of triadimefon in the leachate wouldn't over the standard at any time after spraying. The concentration of chlorothalonil in the leachate was very low even if twice the normal application amount. The chlorothalonil had little pollution to both surface and underground water if the application amount was controlled in 0.10-0.40 g/m2·once.After sampling and analyzing, it was found that the maximum concentration of nitrate in the artificial lakes of five golf courses in Chongqing area appeared in summer with heavy rainfall. The concentration of nitrate was over 25m/L in three golf courses'artificial lakes. The concentration of ammonia nitrogen seasonal exceeded V class water standards of Environment quality standards for surface water quality (GB3838-2002). The nitrite concentration of artificial lakes investigated reached A class of Environment quality standards for landscape (GB-12941-91); the total phosphorus concentration of C1 and C2 artificial lakes couldn't reach V class water standards in summer with heavy rainfall.