Drip fertigation significantly reduces nitrogen leaching in solar greenhouse vegetable production system

文献类型： 外文期刊

第一作者： Lv, Haofeng

作者： Lv, Haofeng;Lin, Shan;Wang, Yafang;Zhao, Yiming;Li, Yingjie;Du, Jiuyue;Wang, Jingguo;Lian, Xiaojuan;Wang, Zhengxiang;Butterbach-Bahl, Klaus;Butterbach-Bahl, Klaus

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关键词： Solar greenhouse tomato; Drip fertigation; Conventional flooding irrigation; Straw addition; N leaching

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2019 年 245 卷

页码：

收录情况： SCI

摘要： Vegetable production in solar greenhouses in northern China results in the excessive use of nitrogen (N) fertilizers and water via flooding irrigation, Both factors result in low N use efficiency and high environmental costs because groundwater becomes contaminated with nitrate (NO3-). Four consecutive tomato (Lycopersicum esculentum Mill.) cropping seasons were tested whether drip fertigation and/or the incorporation of maize straw (S) may significantly reduce NO3- and dissolved organic N (DON) leaching while increasing the water-use efficiency (WUE) and partial factor productivity of applied N (PFPN) of the tomatoes. The following treatments were used: (1) conventional flooding irrigation with overfertilization (CIF, 900 kg N ha(-1) season(-1)), (2) CIF + S, (3) drip irrigation with optimized fertilization (DIF, 400 kg N ha(-1) season(-1)), (4) DIF + S. We found that (1) DIF significantly increases the PFPN and WUE by 262% and 73% without compromising the yield compared with CIF, respectively. (2) For CIF, approximately 50% of the total N input was leached at a NO3-/DON ratio of approximately 2:1. (3) Compared with CIF, DIF reduced NO3- and DON leaching by 88% and 90%, respectively. Water percolation was positively correlated with N leaching (p < 0.001). (4) Straw application only reduced NO3- leaching losses in the first year and did not affect DON leaching overall, although DON leaching was increased in DIF in the first growing season. In conclusion, DIF significantly reduces NO3- and DON leaching losses by approximately 90% compared with the current farmer practice (CIF). Considering the significant DON leaching losses, which have been overlooked because previous measurements focused on NO3-, DON should be considered as a primary factor of environmental pollution in conventional solar greenhouse vegetable production systems. (C) 2018 Elsevier Ltd. All rights reserved.

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