206 Nebraska Agricultural Exp. Station, Research Bui. 6. 
It appears that the best means of securing crops definitely 
suited to dry farming conditions is actually to grow and compare 
them under those conditions. 
WEEDS. 
One of the most practical cultural treatments which a farmer 
can give his crops is the reduction of weeds. Weeds require 
water and fertility the same as does the crop, and where a shortage 
of moisture exists the crop is certain to suffer from the presence 
of weeds. Weeds use moisture in proportion to their number and 
Fig. 24. — A field of corn which had been robbed of moisture by sunflowers 
and pig weeds. 1914. 
size. Wild sunflowers grown in these experiments consumed as 
much moisture individually as an entire hill of three large corn 
plants; 
WATER USED PER ACRE. 
Experience with potometer and field tests would indicate 
that caution must be taken in applying the results from 
potometer studies to general farm practice. 
It is impossible to estimate from potometer experiments the 
exact amount of water used per acre by a given crop under field 
