240 Bulletin 37. 



23. The amount of water needed by a deciduous orchard to 

 keep it in good condition in southern Arizona from March to 

 November is about 21 inches, which can be stored in the soil In- 

 die application of about three feet during winter. * 



24. The amount that need be applied to grow a green- 

 manuring crop and store enough water in the soil to carry a de- 

 ciduous orchard through the summer is about four feet. 



25. Deep winter irrigation followed by thorough summer 

 cultivation is better for deciduous orchards in southern Arizona 

 than the frequent application of small amounts of water during 

 the growing season. 



