Journal of Integrative Agriculture ›› 2022, Vol. 21 ›› Issue (4): 1215-1224.DOI: 10.1016/S2095-3119(21)63853-4

所属专题: 农业经济与管理合辑Agricultural Economics and Management

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  • 收稿日期:2021-05-24 接受日期:2021-11-01 出版日期:2022-04-01 发布日期:2021-11-01

Wastewater irrigation and crop yield: A meta-analysis

WANG Han-jie1, Jingjing WANG2, Xiaohua YU3   

  1. 1 College of Economics and Management, Southwest University, Chongqing 400715, P.R.China
    2 Department of Economics, University of New Mexico, NM 87131, USA
    3 Department of Agricultural Economics and Rural Development, University of Goettingen, Goettingen 37073, Germany
  • Received:2021-05-24 Accepted:2021-11-01 Online:2022-04-01 Published:2021-11-01
  • About author:WANG Han-jie, E-mail: whjlee@163.com; Correspondence Xiaohua YU, E-mail: xyu@uni-goettingen.de
  • Supported by:
    The contribution of Dr. Hanjie Wang (Southwest University, China) is supported by the National Social Science Fund of China (20CSH048, 20AZD024 and 21ZDA062), the National Natural Science Foundation of China (71773099), the Humanities and Social Sciences Project Funded by the Ministry of Education, China (21YJC790110), and the Rural Finance Survey of the Ministry of Agriculture and Rural Affairs, China (05190084).

摘要:

尽管农业污水灌溉是应对水资源匮乏的潜在适应性策略,但污水灌溉对粮食产量的影响在不同研究中存在较大差异,这使得我们难以全面评估污水灌溉对全球粮食安全的作用。基于1987—2021年62项农学试验研究数据,本文采用Meta分析方法研究了污水灌溉对粮食产量异质性的影响因素。研究结果表明:(1)污水灌溉的平均粮食增产效应为19.7%;(2)生活污水和养殖污水灌溉能够显著提高粮食产量,但工业污水灌溉的作用显著为负;(3)生活污水的养分浓度与粮食产量存在显著的正相关关系;(4)农学试验设计,如田间试验、试验次数以及化肥使用,是导致不同研究中粮食增产效应差异的影响因素;(5)粮食增产效应在外文和中文文献中存在显著差异;(6)现有文献主要揭示了污水灌溉对粮食产量的短期效应,其长期影响将是未来的一个重要研究问题。


Abstract: Although wastewater irrigation in agriculture could be a potential adaptation to water scarcity, its effect on crop yield varies in the literature, making it difficult to evaluate its role in global food security comprehensively.  Using agronomic experiment data from 62 studies between 1987 and 2021, we employ a meta-analysis to analyze the factors contributing to the heterogeneous effects of wastewater irrigation on crop yield.  Our findings can be summarized as (1) the mean yield growth effect of wastewater irrigation is 19.7%; (2) domestic and breeding wastewater irrigation could significantly increase crop yield, while industrial wastewater has a negative effect although not significant; (3) high nutrients concentration of domestic wastewater is significantly positively correlated with crop yield; (4) agronomic experiment designs in terms of field experiment, experiment times, and fertilizer use could contribute to the divergent crop yield effects across the studies; (5) there is a publication bias of the research results between the English and Chinese literature; (6) the literature mainly sheds light on the short-run effect, and the long-run impact shall be an important research question in the future.

Key words: wastewater irrigation , crop yield ,  food security ,  meta-analysis