Am looking for databases describing minimum standards for recycled water for irrigation?
In terms of permissible levels of Na Cl EC SAR BOD etc per water analysis of the water source.
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The Food and Agriculture Organization (FAO) of the UN has numerous datasets and papers relating to crop production. This paper 'Water Quality in Agriculture" discusses recommendations in a wide variety of aspects of irrigation. -
The FAO's AQUASTAT datasets cover information on water resources per country:
Within these datasets are data related to waste water treatment for crop production use.