164 



SOUTHERN FIELD CROPS 



abundantly dry for plowing), more harm than good will 

 result. 



Since the subsoil is compact, much power is needed to pull 

 a subsoil plow (Fig. 78), making this a rather expensive 

 operation. While there are many exceptions, the majority 

 of experiments in subsoiling land subsequent to January 1 

 have shown no immediate increase, or not enough to pay 

 for the extra cost of subsoiling. Subsoihng, when needed 



FiQ. 79. — A Turn-plow. 



at all, should not be done more frequently than once in 

 two or three years. It is usually more practicable to in- 

 crease the depth of ordinary plowing than to practice sub- 

 soiling. 



Implements used in preparation for corn. — Besides the stalk 

 cutter, the implements for preparation are usually either the turn- 

 plow (Fig. 79), which may be of various sizes and patterns, or the 

 disk-plow (Fig. 80). The latter is suited only to level plowing but 

 does its work more completely than the turn-plow, though appar- 

 ently at greater expenditure of horse power. Use is sometimes 



