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Wastewater irrigation was initiated as early as 1958 in the suburb of Shijiazhuang, China. This has resulted in groundwater becoming contaminated by nitrate to a depth of about 100m with an average concentration of 40mg NO3−/L. The annual average irrigation rate of wastewater in this area is about 430mm, and the water table is relatively stable in contrast to the surrounding area, where no wastewater...
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