30 University of California Publications in Agricultural Sciences [Vol.3 



optimum moisture percentage in the same soil are not far apart. 

 While the height of the trees is greatest at moisture percentages in 

 excess of that of the moisture equivalent, the most vigorous appearance 

 of the trees is obtained with percentages of soil moisture very close 

 to the moisture equivalent. As above stated, it is not possible now 

 to discuss the detailed results of the moisture determinations in the 

 orchard, but in general it was true that the soil moisture percentages 

 rarely fell to the wilting point in the orchard soil and very infre- 

 quently rose to the optimum under the system of irrigation practiced. 

 In the orchard under consideration, therefore, a lack rather than an 

 oversupply (a common condition elsewhere in California) of water 

 seems to be the rule. 



