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THE FARMERS HANDBOOK. 



0. SmotJtering Crop*. — The growth of a crop that by reason of its dense 

 foliage excludes light and air from the surrounding soil, either in rotation 

 with or in combination with the main crop, is a measure often adopted for 

 the control of weeds. Green manure crops can sometimes be put to this use 

 in addition to their normal function. 



The application of artificial nitrogenous fertilisers to a weed infested 

 stand of a fodder crop such as lucerne often results in such a vigorous growth 

 as to smother and crowd out the weeds. 



7. Drainage. — Species of weeds that are common to low-lying areas are found 

 to disappear when an infested area is drained and pur to more profitable use 

 by being sown to a useful crop 



i s . Chemical Exterminators. — There are a number of chemical substances 

 which are injurious to plant growth and which may under some circumstances 

 be applied to the destruction of weeds, but under general conditions the cost 

 of their purchase and application is too great for their use on large areas. 



Proclaimed Weeds in New South Wales. 



The following is a list of plants declared to be noxious in various Shires 

 and Municipalities in New South Wales, up to 31st July, 1922 : — 



