92 Weeds. 



a farm is fairly well cleaned, then it is sim- 

 ply inexcusable to allow noxious weeds — 

 at least those which are most troublesome — 

 to mature their seeds. To allow them to 

 do so is to show an indifference to one's 

 best interests which cannot be defended. 



The specific modes of hindering weeds 

 from ripening their seeds will of course 

 vary with the particular weed, and also with 

 the crop in which it grows. Several of 

 these specific modes will be described at 

 length in the following chapter. 



As was said above, one of the best and 

 most reasonable means that can be adopted 

 for preventing weeds from ripening their 

 seeds is by a modification of the rotation. 

 The correctness of this opinion will at once 

 be apparent when we think, first, of the 

 unreasonableness of growing a crop a very 

 large portion of which consists of weeds, 

 while we may just as well grow some other 

 crop that will mature at a different season 

 and be comparatively free from weeds ; 

 and, second, that with some crops, certain 

 weeds cannot be prevented from ripening 

 in them without the infliction of consider- 

 able injury to the crop amid which they 

 grow. In any case, however, the hope of 



