Concerns about irrigation generally center on whether there is enough water at the right time to support agricultural requirements. An issue that gets less attention is the quality of the water applied to the crops. This study finds that almost 900 million people are at risk from crops irrigated with water that received low levels of wastewater treatment. Are you measuring the quality of water used for irrigating the food you eat?

http://iopscience.iop.org/article/10.1088/1748-9326/aa75d1/pdf

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