Impact Of Zeolite On Yield-increasing And Water-saving Performance Under Different Water And Nitrogen Management

The tasks to reduce water consumption and improve the nitrogen use efficiency, strengthen the water and nitrogen management have become a research hotspot in rice production. The clinoptilolite can significantly improve the soil water-holding capacity and cation exchange capacity. Therefore, pot and the non-weighing lysimeter experiments were used to clarify the yield-increasing effects by zeolite under different water and nitrogen managements, respectively. We conducted two experiments to study the effects of clinoptilolite under different irrigation models and nitrogen levels on paddy soil characters and rice yield, nitrogen accumulation and the influence on water-nitrogen utilization efficiency. Main conclusions are as follows:(1) Increasing nitrogen application significantly increased rice leaf area index, the dry matter accumulation of rice stem, and eventually improve the rice grain yield. With increasing nitrogen application, clinoptilolite (0?10 t/hm2) in different growth stages could significantly improve rice leaf area index, stem and leaf dry matter accumulation amount and rice yield. Overuse of clinoptilolite may lead to a decrease in rice leaf area and dry matter accumulation and rice yield. Clinoptilolite mixed with nitrogen fertilizer is more obvious. Clinoptilolite (5?10 t/hm2) mixed with nitrogen fertilizer increase the rice production by 614?809 kg/hm2, and increase rice yield rate by 8.6%?11.4%.(2)The increase of nitrogen can significantly increase rice total nitrogen accumulation on the above ground, but the nitrogen use efficiency significantly lower; clinoptilolite can both significantly increase the total nitrogen accumulation and nitrogen utilization efficiency. Increasing clinoptilolite can significantly enhance the water productivity, and rice quality showed no significant changes.(3) Compared with the conventional flood irrigation, Severe alternate wetting and drying irrigation can significantly reduce water consumption of rice, but significantly reduced the dry matter accumulation and rice yield; And mild alternate wetting and drying irrigation does not significantly affect the rice yield. And mild alternate wetting and drying irrigation mode with clinoptilolite used in paddy field can significantly increase rice yield and nitrogen use. At the same time, it significantly further saved water on the basis of dry-wet alternate irrigation.(4) Paddy field application of clinoptilolite can increase the paddy soil CEC, Z2 (7.5 t/hm2) effect is remarkable.Zeolite unique physical and chemical properties can affect negatively charged colloid organic matter and mineral in the soil colloid and the nature of the number of significant increase in the paddy soil CEC, enhance the application of the buffering capacity of the soil and retention capacity.