190 



DRY-FARMING 



moisture of two seasons for the use of one crop ; and 

 to set free fei'tility to enable the ].)lant to grow with 

 the least amount of water. It is not yet fully under- 

 stood what changes occur in fallowing to give the soil 

 the fertility wliich reduces the water needs of the 



Fiu. 46. 



Dr\--fann i)otatoos, Rosebud Co., P^IontaDa, l!-)09. 

 bushels per acre. 



Yield, 2S2 



plant. The researches of .Vtkinson in M(jntana, 

 Stewart and Graves in Utah, and Jensen in South 

 Dakota make it seem probal)Ie that the formation of 

 nitrates plaj's an important ]:)art in the whole process. 

 If a soil is of such a nature that neither careful 

 deep plowing at the right time iKjr constant crust 



