16 



Fertilizers 



a higher degree of fertility is necessary in order to pro- 

 duce maximum crops, and the cost of production is again 

 proportionately greater. These facts strongly emphasize 

 the necessity of a careful study of the relation of farm 

 practice to the artificial losses of fertility. 



The artificial loss of fertility that may be incurred by 

 the sale of crops is largely measured by the knowledge of 

 the producer concerning the relation between the price 

 received for the crop and the fertility contained in it, 

 and thus removed when sold, and by his intelligence in 

 adjusting his methods so as to reduce to a minimum the 

 actual loss. 



The following tabular statement shows very clearly 

 the differences in the losses of the constituents in the sale 

 of different classes of plants : 



FERTILIZER CONSTITUENTS IN CEREALS AND VEGETABLES 



