172 Nebraska Agricultural Exp. Station, Research Bui. 6. 
relative intake of soil solutes of suppressing the transpiration 
rate thru increased atmospheric humidity. 
Ash determinations were made of plants grown in comparable 
potometers in the field during 1913 and 1914 in the test for deter- 
mining the seasonal effects upon transpiration. The 1913 and 
1914 soil saturation tests also contained comparable plants during 
the two seasons 1913 and 1914, for which ash determinations 
have been made. The reader is referred to Tables 69, 70, and 71 
for detailed data concerning these relationships, which are sum- 
marized in Table 72. 
Table 70. — Effect of difference in seasonal climatic conditions upon 
the relation between transpiration and the ash content of corn 
plants. 1913 and 1911+. 1 
Year 
1913 
1914 
Ratio 1913 
to 1914 
Dry weight per plant (grams) 
372.00 
443.00 
Total weight of ash (grams) 
23.68 
22.29 
Ash content (per cent) 
6.37 
5.03 
100:79 
Total water transpired per plant (kilos) 
165.00 
123.00 
100:75 
Water used per gram dry matter (grams) . . . 
445.00 
277.00 
100:62 
Water transpired per gram ash content 
(kilograms) 
6.97 
5.52 
100:79 
Water transpired per sq. in. leaf-area 
(grams) 
155.00 
103.00 
100:66 
Water evaporated per sq. in. free water 
surface 2 (grams) 
476.00 
284.00 
100:60 
1 Further data concerning these plants are reported in Tables 33 and 34, 
which contain five years' results showing the transpiration relationships in 
similarly treated potometers to seasonal climatic differences. 
2 Average for July and August. 
By averaging the per cent ash ratios in the dry and humid 
greenhouses for the plants grown in both the large and small 
potometers during 1912, we secure an average ratio of 100:95.5. 
A similar ratio for the field potometers in 1913 and 1914 secured 
by averaging the ratios from the three different degrees of soil- 
moisture content and also from the plants reported in Table 70 
gives a ratio of 100:93.5. The data of the three tables as sum- 
marized in Table 72 indicate that there may be considerable 
variation in per cent ash of the corn plant, but that as a general 
principle the per cent ash is slightly lower under climatic condi- 
tions having a low evaporation coefficient. 
