82 



THE OLIVER PLOW BOOK 





Result of a portion of a field plowed with the combined rolling coulter 

 and jointer attached to the plow. 



ferent treatment. The habit of cutting the tops of 

 these plants is not always the most desirable method 

 because very many of them will put out new leaves and 

 produce seeds, consequently, if the cutting method is 

 practiced the tops must be cut sufficient times during the 

 season to prevent the plants going to seed. Perennial 

 weeds, or those that grow from the roots, are the most 

 difficult to handle. A method of cultivation that will 

 expose the roots to the surface, and prevent them start- 

 ing growth is the most successful. 



In all these different types of weeds one striking fact 

 stands out. That is both weed and legitimate plants 

 require the gases from the air which must come in 

 through the leaves and stem. This being true the first 

 course in the destruction of weeds is to prevent this food 



