Before revision: Example values for crops +Approximate values of seasonal crop water needsCropCrop water needs mm / total growing periodSugarcane1500–2500Banana1200–2200Citrus900–1200Potato500–700Tomato400–800Barley/oats/wheat450–650Cabbage350–500Onions350–550Pea350–500 Water sources Traditional irrigation channel in Switzerland, collecting water from the high Alps Irrigation is underway by pump-enabled extraction directly from the Gumti, seen in the background, in Comilla, Bangladesh.
After revision: Groundwater and surface waterExample values for crops +Approximate values of seasonal crop water needsCropCrop water needs mm / total growing periodSugarcane1500–2500Banana1200–2200Citrus900–1200Potato500–700Tomato400–800Barley/oats/wheat450–650Cabbage350–500Onions350–550Pea350–500 Water sources Traditional irrigation channel in Switzerland, collecting water from the high Alps Irrigation is underway by pump-enabled extraction directly from the Gumti, seen in the background, in Comilla, Bangladesh.