2. Yuma Valley - Arizona state - USA

3. Yuma Yuma is in the extreme south west of Arizona – on the R. Colorado next to California and the border with Mexico.

4. Temperature – very hot. 35*C in summer. Annual rainfall total from 1993 to 2002– (about 3 inches) 8cms a year on average

5. Yuma – Winter Salad Bowl Capitol of the USA

6. Colorado river - irrigation channel Lot of evaporation loss.

7. Furrow irrigation

8. Yuma – sprinkler system Uses less water than furrow irrigation. Cools the soil surface temperature when salad starting to grow.

9. Central pivot sprinklers Circular fields

10. Drip irrigation – feeds water slowly and directly to roots

11. Dole Salad Packing Factory

12. Mexican migrant workers Seasonal low paid work

13. Competition for Water

14. Colorado water runs out.

15. Rising costs Too much fertiliser used

16. Rise of organic farming

17. Farming is run by big businesses Agribusiness Small family farms dying out

18. Young people need specialist education for a career in farming

19. The River Colorado One giant plumbing system?

20. Is the farming sustainable?

21. Back to the Desert?