Effective quantitative and qualitative management of water for irrigation is crucial in many regions and the use of reclaimed water is a possible solution. Quantifying the impact of the use of such water is thus important. Using life cycle assessment methodology, this study analyzes the impact of water reuse irrigation and farmers’ practices in greenhouse cucumber production. Three scenarios concerned sources of water for irrigation and agricultural practices: the first scenario used surface water including reclaimed water, the second used groundwater. The third scenario resembled the first but also accounted for fertilizer application based on theoretical cucumber requirements. The third scenario showed 35% less fertilizer is required than the quantities farmers actually use. Our results show that the higher environmental impact of irrigation using reclaimed water than using groundwater is mainly due to over-fertilization. Comparison of the first and third scenarios also showed that the reduction in the environmental impact under the third scenario was significant. We conclude that LCA is a useful tool to compare the impacts of different water sources and farmers’ irrigation/fertilization management practices, and in particular, that the quantity of nutrients in reclaimed water should be deducted from the actual amount applied by the farmers.

在许多地区，对灌溉用水进行有效的定量和定性管理至关重要，而再生水的使用是一种可能的解决方案。因此，量化使用此类水的影响非常重要。本研究使用生命周期评估方法，分析了回用水灌溉和农民实践对温室黄瓜生产的影响。三种方案涉及灌溉和农业实践用水来源：第一种方案使用包括再生水在内的地表水，第二种方案使用地下水。第三种情况与第一种情况相似，但也根据理论黄瓜需求说明了肥料的施用。第三种情况表明所需肥料比农民实际使用的肥料少35％。我们的结果表明，使用再生水灌溉比使用地下水灌溉对环境的影响更大，主要是由于施肥过多。比较第一种情况和第三种情况还表明，第三种情况下对环境的影响明显降低。我们得出的结论是，生命周期评估是比较不同水源和农民灌溉/施肥管理实践的影响的有用工具，特别是，应从农民的实际用量中扣除再生水中的养分含量。