CHAPTER XVII 

 THE PRINCIPLES OF INTERCULTURE 



TILLAGE MACHINERY 



A GREAT variety of tools has been developed especially 

 adapted for the tillage of corn. For the first cultivation 

 of drilled or checked corn, the common smoothing harrow 

 is often used. It is an excellent tool for this purpose as 



Pig. 61. — The weeder. A very useful tool on loose soil, for cultivating 

 corn the first four weeks. Cultivates three rows at a time. 



it works a wide swath and kills young weeds effectively. 

 One disadvantage is that it carries considerable trash es- 

 pecially where there are many large corn stubbs in the 

 land. In this case the weeder is much better than the 

 spike tooth harrow, as it clears of trash and does less in- 

 jury to the young plants. When the weather is dry and 



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