46 



Journal of Agricultural Research 



Vol. HI, No. I 



Table XXVII. — Water requirement of native and introduced grasses at Akron, Colo. 



in IQIJ — Continued 



WEEDS 



A number of weeds were grown in pots at Akron in 191 3, in order to 

 determine their water requirement. (Table XX\'III.) Most of these 

 were planted late in the season, after the crops of grain had been removed. 

 Pigweed and the annual sunflower were, however, started at the beginning 

 of the season. Three crops of pigweed were produced, the water require- 

 ment for the first, second, third, and combined cuttings, based on dry 

 matter, being 32.s±io, 326±4, 278±7, and 320±7, respectively. 



