200 
Journal of Agricultural Research 
Vol. Vtl, No. 4 
Fig. 15.—Graph showing a linear relation between the logarithm of the transpiration-evaporation ratio 
of Alfalfa E-23 (in the open) and the time. 
c /(JA/£ /S /4 xJULy 
Fig. 16.—Observed daily ratios of transpiration to evaporation during early stages of growth of Sudan 
grass (shown by circles) compared with exponential graph computed from the relationship shown in fig¬ 
ure zi (solid line). 
