146 Weeds. 



weeds those parts of a farm which are sub- 

 jected to a periodical overflow of water 

 coming down from lands where they 

 abound. The most that can be done, under 

 such circumstances, is to keep them cut 

 down as they spring up, so that they can- 

 not mature their seeds. 



Modes of Eradication. 



The following are the modes of eradica- 

 tion that have been found most successful 

 in dealing with ragweed and kinghead. 



/. Modifying the rotation and autumn 

 cultivation. Modify the rotation, and give 

 special attention to autumn cultivation. 

 Happily, the rotation will not require seri- 

 ous modification where careful attention is 

 given to the working of the soil in autumn, 

 but late-ripening cereals should not be 

 grown in the meantime, nor should timothy 

 nor any of the forms of clover be allowed 

 to produce a seed crop in the infested fields 

 until the ragweed is much reduced. As 

 soon as the cereal crops are harvested, the 

 ground should be plowed or disked. It 

 may then be occasionally stirred until the 

 late plowing that is given on the approach 

 of winter. Autumn cultivation is peculiarly 



