SOIL MANAGEMENT. 



57 



WEEDS. 



To most the harmful effects of weeds are obvious ; never- 

 theless, it is safe to say that in South Africa no general cultural 

 operations would have a greater beneficial effect on crop pro- 

 duction than would the determined control of weeds. Not only 

 do weeds reduce crop yields, but in seasons when moisture is 

 a limiting factor they may be responsible for complete failures 

 of crops. 



A weed may be defined as a plant out of place, or, any 

 plant growing where it is not wanted. 



The following is a Ust of the noxious weeds proclaimed in 

 the various Provinces of the Union : — 



