河西绿洲地区水氮耦合对大豆产量的影响

黑河中游地区由于农业水资源紧缺、灌溉方式粗放及水肥的不合理调配，导致该区水土资源浪费严重，为了节约水土资源，提高当地生产水平，本文基于2021年5-9月在水资源紧缺的黑河中游地区（张掖市民乐县益民灌溉试验站）采用膜下滴灌调亏灌溉技术，通过田间试验和理论分析相结合，主要研究膜下滴灌水氮耦合下大豆干物质积累及对产量的影响，研究结果表明：灌水量一定的情况下，适量增施氮肥可以促进大豆干物质的积累，但过量的氮素会导致大豆干物质的积累程下降趋势。N2W2处理是实现大豆产量较优的水氮耦合模式，较CK（不施氮量）、N1、N3(高施氮量)处理相比显著提高大豆产量39.94%、13.11%、20.73%。

Effect of water and nitrogen coupling on soybean yield in hexi oasis

Due to the shortage of agricultural water resources, extensive irrigation methods and unreasonable allocation of water and fertilizer, the water and soil resources in the middle reaches of the Heihe River are seriously wasted. In order to save water and soil resources and improve the local production level, this paper, based on the combination of field experiments and theoretical analysis, adopts the technology of drip irrigation under film to adjust deficit in the middle reaches of the Heihe River (Minle County Yimin Irrigation Station, Zhangye City) where water resources are scarce from May to September 2021, This paper mainly studied the dry matter accumulation of soybean and its effect on yield under the coupling of water and nitrogen under mulch drip irrigation. The results showed that under a certain amount of irrigation, the appropriate amount of nitrogen fertilizer could promote the dry matter accumulation of soybean, but excessive nitrogen would lead to a downward trend in the accumulation process of dry matter of soybean. N2W2 treatment is a water nitrogen coupling mode to achieve better soybean yield. Compared with CK (no nitrogen application), N1, N3 (high nitrogen application) treatment, N2W2 treatment significantly increased soybean yield by 39.94%, 13.11%, 20.73%.