It is estimated that more than half of the global food supply depends on some type of water management. Growing seasons around the world rarely have the right amount of precipitation, and deficits and excesses of water are the most significant overall yield-limiting factors to crop production. … When evaporation rates are high, sustained irrigation can generate enough salt to eventually poison the crops. Groundwater in semiarid regions usually contains a lot of salts. Soils for Urban Farms, Gardens and Green Spacesīut the irrigation that nourished Mesopotamian fields carried a hidden risk.
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