144 



TILTH AND TILLAGE 



board plow cannot be used. The disk plow may be used success- 

 fully in plowing loose peat soils. 



A prairie breaker. 



Best Time to Plow. — The best time to plow depends largely 

 upon the object to be attained. Since nearly all plowing is done 

 in the fall and spring, it would be well to consider here a few 

 important points concerning fall and spring plowing. 



Fig. 80. — One type of disk plow. 



Fall Plowing. — Usually farmers find it convenient to plow in 

 the late fall, because farm work then is not so pressing as in other 

 seasons; moreover, the congestion of work in the spring is much 

 relieved when the plowing is done at this time. When soils are 

 to be plowed deeply, or when the seed bed is to be deepened, late 



