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Yuma Valley - Arizona state - USA
Yuma Yuma is in the extreme south west of Arizona – on the R. Colorado next to California and the border with Mexico.
Temperature – very hot. 35*C in summer. Annual rainfall total from 1993 to 2002– (about 3 inches) 8cms a year on average
Yuma – Winter Salad Bowl Capitol of the USA
Colorado river - irrigation channel Lot of evaporation loss.
Yuma – sprinkler system Uses less water than furrow irrigation. Cools the soil surface temperature when salad starting to grow.
Central pivot sprinklers Circular fields
Drip irrigation – feeds water slowly and directly to roots
Dole Salad Packing Factory
Mexican migrant workers Seasonal low paid work
Competition for Water
Colorado water runs out.
Rising costs Too much fertiliser used
Rise of organic farming
Farming is run by big businesses Agribusiness Small family farms dying out
Young people need specialist education for a career in farming
The River Colorado One giant plumbing system?
Is the farming sustainable?
Back to the Desert?
One area can illustrate that the supply of & demand for Water Varies over Time & Space A case study of the Colorado drainage basin SW USA.
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