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Irrigation amount dominates soil mineral nitrogen leaching in plastic shed vegetable production systems

浸出(土壤学) 环境科学 灌溉 氮气 农学 生产(经济) 土壤水分 土壤科学 化学 经济 有机化学 生物 宏观经济学
作者
Haofeng Lv,Weiwei Zhou,Jing Dong,Shipeng He,Fei Chen,Minghao Bi,Qunyan Wang,Junliang Li,Bin Liang
出处
期刊:Agriculture, Ecosystems & Environment [Elsevier BV]
卷期号:317: 107474-107474 被引量:15
标识
DOI:10.1016/j.agee.2021.107474
摘要

Flood irrigation and over fertilization lead to a large amount of nitrogen (N) leaching in conventional plastic shed vegetable production systems, resulting in low N use efficiency and huge environmental costs. Drip fertilization can significantly reduce N leaching by reducing irrigation and N application; however, the respective roles of each factor in reducing N leaching remain unknown. In this study, structural equation modeling was carried out to determine the direct and indirect relationships among factors related to N leaching in plastic shed tomato production across six consecutive growing seasons. Treatments were as follows: conventional flooding irrigation and fertilization (CIF); CIF + corn straw (CIF + C); CIF + wheat straw (CIF + W); drip irrigation and fertilization (DIF); DIF + corn straw (DIF + C); and DIF + wheat straw (DIF + W). The results showed that the most important contributing factor to N leaching in this study was water percolation, which is mainly controlled by irrigation amount. This suggests that irrigation amount has a greater effect than N input rate and straw addition. Compared to CIF, DIF significantly reduced N leaching by an average of 63.9% without compromising tomato yield, with significant increases of 52.9% and 28.1% in the water use efficiency (WUE) and partial factor productivity of applied N (PFP N ), respectively. Meanwhile, application of straw also resulted in a significant reduction in N leaching by reducing water percolation, with wheat straw having a greater effect than corn straw. Overall, excessive irrigation rather than N input was found to be the main cause of significant N leaching, highlighting the importance of optimal irrigation schemes. We therefore recommend precise drip irrigation and fertilization combined with straw addition for sustainable and environmentally-friendly plastic shed vegetable production. • Irrigation has greater effect on N leaching compared to N input and straw addition. • Water percolation and leachate N concentration were mainly controlled by irrigation. • Drip irrigation significantly reduced N leaching without compromising tomato yield. • Adding straw significantly reducing N leaching mainly by reducing water percolation.
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