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 RIDING AND WALKING 
CULTIVATOR 
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. 
Depre or CULTIVATION 
There is more or less difference of opinion on this partic- 
ular point. The objections to surface cultivation, when it 
