34 BULLETIN 31, PORTO RICO EXPERIMENT STATION 
In the absence of definite knowledge as to the best time to apply 
fertilizer, applications may be made twice annually, the first soon 
alter the termination of the collection of the crop, and prior to the 
blossoming of the following crop in late November or December, and 
the second in May or June when the new crop is in process of develop- 
ment. The fertilizer should be well distributed over the range of the 
coffee roots and incorporated with the surface soil. 
Whether the application of chemical fertilizers to coffee will prove 
a profitable practice must depend upon the relation between cost of 
fertilizer and selling price of coffee. Within the period covered by 
the tests here reported the prices of both varied greatly. With high 
prices of coffee, use of fertilizers may prove profitable, and con- 
versely, with low prices it may entail a loss. 
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