116 FOOD FOR PLANTS 



month. The last cultivation is done best by a disk 

 harrow. 



Formulas for full-grown citrus trees in tabular 

 form are as follows : 



Rates per Acre 



Nitrate o£ Soda alone 200 lbs. • 



or preferably 



Nitrate of Soda 400 lbs. 



Acid, or Superphosphate 400 lbs. 



When potash salts can be conveniently obtained 

 we advise the use of fifty pounds of sulphate of potash 

 to the acre every other year. 



These formulas it is believed will also be found 

 very satisfactory for both full-grown lemon trees and 

 full-grown grapefruit. 



SOILS AND OTHER FACTORS IN RELATION 

 TO CROP PRODUCTION IN CALIFORNIA. 



The use of Chilean Nitrate is increasing year by 

 year in England, and it is coming to be more and 

 more appreciated there, as well as on the continent of 

 Europe. 



In fact, everywhere in the world where there is 

 progressive and enlightened experiment work, the 

 unique qualities of Chilean Nitrate are putting it 

 ahead of every other nitrogenous plant food. No 

 reputable authority in the world has ever advocated 

 such large quantities of Chilean Nitrate per acre as 

 would result in any abnormal accumulation of alkali. 

 Moreover, the use of acid phosphates, associated as 



