i6 



COMMON WEEDS 



figures (taking 2.2 lb.= i kilogram, and 2.48 acres = 

 i hectare) : 



a Weight of weeds included with hay and straw. 



In an instructive experiment carried out in 1907 and 

 1908 at University College Farm, Reading, it was found 

 that when mangolds were not weeded after the plants 

 were singled the yield in the two years averaged 16^ 

 tons per acre, while on a similar plot on which the 

 weeds were kept down by hand weeding only, without 

 hoeing, the yield averaged 39 tons. When kept clean 

 by hoeing the yield was practically the same as with 

 hand weeding, but with two hoeings only the yield 

 averaged 37^ tons per acre ; with one hoeing only the 

 yield was 31 tons. Two points in this experiment stand 

 out clearly : one hoeing only appears to have almost 

 doubled the yield ; while hand weeding, and keeping 

 quite clean by hoeing, had about the same effect 

 and much more than doubled the yield, the " no 

 weeding " and " hand weeding " comparing in yield as 

 100 to 240. (See also Charlock, p. 59.) 



Finally, as will be observed at p. 367, the loss in 

 purchasing agricultural seeds will be 245. in every .5 



