SUBSOIL PLOWING 



17 



and high subsoil, it is almost essential to practice 

 trenching if the best results are to be obtained; 

 and this is especially true when deep-rooted plants, 

 like beets, parsnips and other root-crops, are desired. 

 In places which can be entered with the plow, 

 deep and heavy plowing to the depth of seven to 

 ten inches may be desirable upon hard lands, 

 especially if such lands cannot be plowed very 



8. Types of subsoil plows. 



often; and the depth of the pulverization is often 

 extended by means of the subsoil plow. This 

 subsoil plow does not turn a furrow, but a 

 second .team draws the implement behind the 

 ordinary plow, and the bottom of the furrow is 

 loosened and broken. Fig. 7 shows a home-made 

 subsoil plow, and Fig. 8 two types of commer- 

 cial tools. It must be remembered that it is the 

 hardest lands which need subsoiling, and that, 

 therefore, the subsoil plow should be exceedingly 



