166 THE OLIVER PLOW BOOK 



hand corner of the furrow where they interfere very little 

 with the upward trend of moisture and thus rapidly 

 help make humus out of the weeds. 



The combined rolling coulter and jointer is the only 

 attachment that has been invented for use with plows 

 which absolutely assures that all kinds and sizes of trash 

 will be buried deep enough in the ground for the suc- 

 cessful eradication of insects which plowing puts out 

 of business. Whatever time of the year it may be neces- 

 sary for plowing it is always advisable to have that plow 

 equipped with a combined rolling coulter and jointer 

 and to see that all trash is buried on the bottom of the 

 furrow. 



