Effects of alternate drip irrigation and nitrogen fertilization on yield and water-nitrogen use efficiency of cucumber in a solar greenhouse

摘要

In order to investigate the effects of alternate drip irrigation and nitrogen fertilization on yield and water-nitrogen use efficiency of cucumber (Jinyuan 578) in a solar greenhouse, we conducted an experiment utilizing split-plot design with drip irrigation as main plots and nitrogen as subplots. The main plots were drip irrigated (alternate drip irrigation, A, and conventional drip irrigation, C), the subplots were the amount of nitrogen (0 level: 0 kg N hm2, 1 level: 320 kg N hm2 and 2 level: 640kg N hm2). The six treatments in total were designated AO, Al, A2, CO, CI, and C2(i respectively. The results showed that: 1) The leaf area of A2 was the largest, 35.5% higher than that of C2. Under low nitrogen treatments, the trend was opposite, Al reduced 18.4% compared with CI; 2) The yield of Al increased by 12.9% compared with CI, and the yield of A2 increased by 11.1% compared with C2; the WUE of Al was Increased by 16.6% compared with CI, the WUE of S2 increased by 14.7% compared with C2; the ANUE of Al increased by 45.4% compared with CI; the ANUE of A2 increased by 215.7% compared with C2; there was no significant difference in yield and WUE between Al and A2, while the ANUE of Al increased by 44.1% compared with A2. In conclusion, alternatedrip irrigation with mid-level rate of nitrogen can significantly increase yield and improve the use efficiency of water and nitrogen and can be used as an effective water-nitrogen management tool in solar greenhouses to achieve the goal of "water-saving and reducing fertilizer" cultivation.