Transpira'ion as a Factor in Crop Production. 131 
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Fig. 17. — Mature plants with leaves removed grown in the four different 
degrees of soil saturation. 1914. Left to right: 1, 50 per cent 
relative soil saturation, without manure; 2, 50 per cent relative soil 
saturation, with manure; 3, 70 per cent relative soil saturation, without 
manure; 4, 70 per cent relative soil saturation, with manure; 5, 95 per 
cent relative soil saturation, without manure; 6, 95 per cent relative 
soil saturation, with manure; 7 and 8 are without and with manure, 
respectively, having an initial relative soil saturation of 70 per cent, 
which was reduced daily by supplying only two-thirds as much water 
as the plants in the 70 per cent relative saturation transpired each day. 
See Table 55. 
EFFECT OF DEFICIENCY OF SOIL MOISTURE. 
(THREE-YEAR AVERAGE.) 
A shortage of moisture, existing in an average relative satura- 
tion of 49 per cent, decreased the moisture-free weight of stalk 
37.3 per cent, the weight of ear 28.5 per cent, the weight of leaves 
9.9 per cent, and the total dry matter 30.7 per cent. The total 
water transpired was reduced 36.8 per cent, and the leaf-area 
