136 



ELEMENTARY AGRICULTURE 



is by the use of commercial fertilizers. In this way 

 soil matter is bought and brought back to the farm to 

 take the place of that sold with the tobacco. Extensive 

 experiments have been made at the different agricul- 

 tural stations to determine the kind and amount of 



A TYPICAL TOBACCO FIELD. 

 (Oconto County, Wisconsin.) 



these fertiliers to use. The results show that they are 

 even better than barnyard manure for this crop. The 

 only way that the farmer can find out the kind and 

 amount best adapted to his soil is by careful experi- 

 ment. It must be remembered, however, that com- 

 mercial fertilizers tend to harden the soil, while barn- 

 yard manure improves its texture. 



