SUMMAKY. 35 



A general average of all of these experiments shows that the weeded 

 plats produced 95.1 per cent as much fodder and 99.108 per cent as 

 much grain as the cultivated ones. If there was any difference 

 between either set of plats in regard to thoroughness in keeping 

 down weeds it was in favor of the cultivated plats. 



Although it remains to be demonstrated how far this principle may 

 be applied in any particular section, as a general average for all the 

 regions in which this work was done it may be concluded that the 

 proposition just stated is substantially true. If this be accepted, 

 weed control becomes the principal object of cultivation. 



Weeds may be attacked in two ways: (1) By the use of tillage 

 implements, the primary purpose of which is their eradication, and 

 (2) by adopting cropping systems having that object in view. 



257 



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