The trade value of a fertilizer does not necessarily indicate its exact 

 agricultural value. The trade value of' a given fertilizer simply shows 

 its cost in our general markets. The agricultural value of a fertilizer 

 shows its capacity in producing certain agricultural crops, and 

 depends not only upon the condition of the fertility of the soil upon 

 which the fertilizer is used, but also upon the physical condition of 

 the soil, the mode of cultivation, the season and the crop to be 

 raised. Experience alone can determine the general fitness and 

 approximate agricultural value of compound commercial fertilizers 

 and fertilizing materials. 



