CHAPTER XI 

 METHODS OF USE OF FERTILIZERS 



THE primary object in the use of a commercial fertilizer 

 is to receive a profit from the increase in the yield of crops 

 from the land to which it is applied; and this may be 

 derived either from the immediate crop, or from the larger 

 yield of a number of crops. That the greatest immediate 

 or prospective profit may be gained, a wide knowledge of 

 conditions which have either a direct or indirect bearing 

 upon the result is essential. 



CONDITIONS WHICH MODIFY THE USEFULNESS OF 

 FERTILIZERS 



In fact, the controlling conditions surrounding the 

 matter are so numerous and so various that it is impossible, 

 with our present knowledge, to lay down positive rules for 

 our guidance. At best, only suggestions can be offered. 



We may possess a full knowledge of both the kind and 

 form of existing fertilizer supplies, their cost and the action 

 under known conditions of the constituents contained in 

 each, as well as their maximum capability for increasing 

 the crop, but together with this knowledge, it is essential 

 that we should know how these facts and principles must 

 be applied to each individual crop, soil and condition, and 

 yet even with this, absolute certainty of profit is not 

 guaranteed. A few of the more important conditions 



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