u 



ARID AGEICULTtTEE. 



continiaed long enougli, at the same time adding 

 nothing in plant food, there are few soils upon 

 which, sooner or later, farming M-ill not become 

 unprofitable. Confining the soil to one crop in- 

 duces the accumulation of insects and plant dis- 

 eases, which are peciiliar to that crop, and when 



Plate X. Government Farm, Cheyenne — 1908. 



the devastation arrives it hits quick and hard. 

 When grain farming is the principle aim in any 

 region, the best practice in addition to the resting 

 of the soil alternate seasons, is to adopt a system 

 of crop rotation which will add fertility. 



BOTATIOH or 

 CBOFS FOB 

 THE DBT 

 FABMEB 



Rotation of crops is not so necessary where 

 land is summer tilled every other year as it is to 

 keep up soil fertility on lands that produce an- 

 nual crops. However, a regular system of rota- 

 tion will pay on all dry farms. The principle 

 aim in a rotation for arid lands, is to keep up 

 the supply of available nitrogen. This is done 

 by the use of legumes which, throiigh the action 



