124 Nebraska Agricultural Exp. Station, Research Bui. 6. 
Fig. 15. — Free-water-surface evaporation jars at four elevations in an oat 
field. 1913. The oats have grown up around the lowest jar so that it 
cannot be seen in the picture. When the oats were full grown, only the 
upper jar showed above the plants. 
moisture from the soil by surface evaporation. In 1913 the first 
records of evaporation at different elevations in corn were ob- 
tained when the corn had made practically no growth and the 
comparative evaporation rates were little affected by the sur- 
rounding crop. During the first week (Table 44) the evaporation 
10 feet above the ground was 220 per cent of that on the ground 
surface, while at the time the corn reached maturity the upper 
evaporation was 430 per cent of that from the lower jar. Table 
50 on page 123 summarizes the relative losses in the five tests. 
RELATIVE WIND VELOCITIES 3 FEET AND 10 FEET ABOVE THE GROUND IN A 
CORNFIELD. 
Relative wind velocities were determined during 50 days in 
1914 (July 17 to September 5) at elevations of 10 feet and 3 feet 
above the ground in a cornfield. The movement of the wind 
