112 Nebraska Agricultural Exp. Station, Research Bui. 6. 
Table 36. — Relation of water used by plants to atmospheric humidity. 
1911. Rogue's Yellow Dent corn used. Grown in potometers 
16 by 36 inches. Harvested at silking stage. 
Dry 
green- 
house 
Humid 
green- 
house 
Number of potometers averaged 
Mean temperature, 12 hours of night 
(degrees F.) 
Mean temperature, 12 hours of day 
(degrees F.) 
Mean relative humidity, 12 hours night 
(per cent) 
Mean relative humidity, 12 hours day 
(per cent) 
Average dry weight per plant 
Average leaf-area per plant (square inches) 
Total water used per plant (kilograms) . . . 
Water used per gram dry weight (grams) . 
Water used per square inch leaf-area 
(grams) 
Water evaporated from 36 square inches 
free water surface (grams) 
5 
80.0 
91.0 
48.0 
37.0 
83.8 
1,079.0 
28.473 
340.0 
27.3 
3,891.0 
5 
75.0 
88.0 
72.0 
58.0 
107.7 
1,070.0 
23.030 
191.0 
19.2 
2,187.0 
Table 37. — Relation of water used by plants to atmospheric humidity. 
1912. Rogue's Yellow Dent corn used. Grown in potometers 
16 by 36 inches. Harvested at silking stage. 
Dry 
Humid 
Ratio 
green- 
green- 
dry to 
house 
house 
humid 
Number of potometers averaged 
5 
5 
Mean temperature 12 hours of day (F.) . . 
91.0 
90.0 
Mean temperature 12 hours of night (F.) . 
81.0 
76.0 
Mean rel. humidity 12 h'rs of day (per cent) 
49.0 
72.0 
Mean rel. humidity 12 h'rs of night (per cent) 
67.0 
82.0 
Average dry weight per plant (grams) .... 
100.9 
90.5 
Average leaf-area per plant (square inches) 
750.0 
729.0 
Total water used per plant (kilograms) . . . 
33.640 
19.067 
Grams water used per gram dry weight 
(grams) 
333.4 
210.7 
100:63 
Grams water used per square inch leaf- 
area (grams) 
44.85 
26.14 
100:58 
Water evaporated per square inch free 
water surface (grams) 
151.39 
80.03 
100:53 
