Influence on leaching water salinity and nutritive elements for irrigating green turfgrass with recycled water.

The mixture of gypsum and peat, wetting agent and sand were applied every month in green turfgrass, which was irrigated with tap water, secondary recycled water and tertiary recycled at the same time. The results showed that the pH and metalion (Cu2 + , Fe2 + , Zn2 + ) content of leachate were not changed significantly (P 0.05). After applying the mixture of gypsum and peat and irrigating with secondary recycled water, the EC of leachate was 5.83 mS/ cm, which was significantly 4.07, 3.32 mS/ cm higher than irrigating with tap water and tertiary recycled water (P 0.05) respectively. The similar result was showed when wetting agent and sand were used as matrix. The concentration of Na+ , total nitrogen and total phosphorus was also changed significantly while irrigating with secondary recycled water (P 0.05). It also showed that the surface water would not be polluted by irrigating with tertiary recycled water in green turfgrass for long time, however, a potential influence could happen to surface water using secondary recycled water. So the secondary recycled water should be treated further to reduce the hazards