buds at the expense of next year's fruit. The ordinary am- Food ' or 

 moniates are not satisfactory for orchard work, as they con- ant! 

 tinue to supply available ammonia all through the season ; not I47 

 enough in the early part of the year to properly set the fruit, 

 hence severe dropping; too much late in the year when none 

 is needed and which causes the formation of leaf rather than 

 fruit buds. The soil between the trees should be regularly 

 tilled, much as in corn growing. That it is not generally done 

 is no argument against the value of such cultivation methods. 



UNIVERSITY OF ARIZONA AGRICULTURAL 

 EXPERIMENT STATION. 



Timely Hints for Farmers, No. 31. 



PROF. W. W. SKINNER. 



A fertilizer of about the composition given below has 

 frequently been advised by the Station for fertilizing orange 

 orchards, and is believed to be in every way suited to the 

 purpose. It should be applied at the rate of from 500 to 

 1,500 pounds to the acre, according to age of trees and 

 quality of soil, and "plowed in deeply at the edge of the 

 branches, about the beginning of the growing season." 



Formula : 



Pounds. 



Bone tankage (10 per cent ammonia) 1,000 



Nitrate of Soda 140 



Sulphate of potash 60 



Dissolved bone (16 per cent, available phosphoric acid) 800 



2,000 



