356 OF WEEDING. 



as the produce of his own seed is often more productive 

 than the changed.* 



In regard to changing the seed of grain crops, there is 

 every reason to believe, (as will be more fully explained 

 in the Appendix, on the diseases of wheat), that by pro- 

 curing seed from foreign countries, in particular from the 

 Cape of Good Hope, the mildew, and other distempers to 

 which wheat is liable, might be prevented. 



As to harrowing the ground, or rolling it, these ope- 

 rations, however important, are so well known, and so 

 similar, according to the Scotch and English systems of 

 husbandry, that it seems unnecessary to dwell upon them 

 in this place. 



SECT. VIII. Of Weeding. 



THE subject of Weeding has rarely been discussed 

 with that attention which its importance merits; and it 

 has been well observed by Mr Brown of Markle, that the 

 most experienced farmers are puzzled, how to extirpate 

 the various sorts of those noxious plants ; for the same 

 operations, which destroy one species of weeds, will some- 

 times encourage the growth of another. 



The following observations on weeding, are principally 

 extracted from the communications of that experienced 

 farmer, and those of Mr Kerr, the intelligent reporter of 

 the Berwickshire husbandry. 



Weeds are either annual, which come to perfection 



* Taking up the potatoes intended for seed early, effectually prevents 

 the curl. 



