ECONOMICS OF WEEDS 



59 



The Connecticut Experiment Station has shown that in 

 the case of eleven feeds upon the market, there were the 

 following numbers of weed seeds in one pound of each : — 



No. I . . ... 11,528 No. 7 



No. 2 7,800 No. 8 



No. 3 29,324 No. 9 



No. 4 22,224 No. 10 



No. 5 . . . . . 8,574 No. II 



No. 6 27,100 



8,160 

 10,360 

 48,663 

 21,267 

 86,000 



The seeds thus present in such enormous numbers be- 

 longed to a comparatively few species of the most trouble- 

 some weeds. Among the most abundant of these were the 

 foxtail grasses, white pig- 

 weeds, knot-weeds, char- 

 lock, black mustard, rag- 

 weed, sorrel, docks, and 

 thistles. "All of these 

 weeds are characteristic of 

 grain screenings which are 

 the refuse separated from 

 the grain, in order to mak« 

 the latter marketable or fit 

 for miUing. These screen- 

 ings vary a good deal in quality. Thus an analysis recently 

 made here of wheat screenings showed about 33 per cent 

 of flax and shrunken cereal, 1 5 per cent of foxtails, 8 per 

 cent of bindweeds and pigweeds, 1 5 per cent of weed seeds 

 of other species, and 21 per cent of dust, broken seeds, 

 and sand." 



Length of Life 



One of the most important considerations in regard 

 to any weed is its length of life. If it lives but one 



Broad-leaved Dock 

 Growth of First Season 



