CULTIVATION 49 



The harrows are the heavy type spike harrows and are 

 run with the teeth straight down. We drive the same way 

 the corn is planted. As stated in the previous chapter, fur- 

 row openers are used on the planter runners. By using this 

 attachment all the corn plants are in a furrow which protects 

 them from the harrow teeth. 



If the field is cloddy, as is sometimes the case in dry sea- 

 sons, the harrow is preceded by the roller. This pulverizes 

 the clods and prevents the harrow from dragging them into 

 the furrow. The first planted fields are often harrowed twice 



(Courtesy John Deere Plow Co.) 



COMBINATION BIDING AND WALKING 

 CULTIVATOE 



before we have finished planting the last. (See illustrations.) 

 Unless furrow openers have been used we do not advocate 

 harrowing corn after it is up. In some cases the weeder 

 might be an improvement over the harrow in cultivating 

 young corn. 



DEPTH OP CULTIVATION 



There is more or less difference of opinion on this partic- 

 ular point. The objections to surface cultivation, when it 



