182 Nebraska Agricultural Exp. Station, Research Bui. 6. 
rather regularly increased; the water used per gram dry matter 
was rather regularly decreased; and the per cent ash content 
and the amount of transpiration per gram ash content were 
somewhat irregularly decreased. 
EFFECT OF KIND OF CROP AND VARIETY UPON RELATION OF TRANSPIRATION 
TO ASH CONTENT. 
Ash determinations were made for all of the corn varieties 
described in pages 159 to 169, and are reported in Table 79. 
Considerable variation exists in the ash relationships of the 
different varieties of corn, but there appears to be no absolute 
correlation between the percentage of ash, the amount of water 
transpired per gram ash content, or the transpiration per gram 
dry matter. The sunflowers possessed a high percentage of ash 
and water requirement per gram of ash and per gram dry matter. 
The two sorghum varieties were slightly lower in the amount of 
water transpired per gram ash content than was the corn. Of 
the 12 corn varieties, the Chinese corn and Roberts' hybrid, 
which was related to Chinese corn, had the lowest transpiration 
per gram ash content. Averaging together the five corn varieties 
with a water requirement per gram dry matter of 260 or above, 
and in a second group those varieties with a water requirement 
ratio of less than 260, we get the following relationships: 
First 
Second 
group 
group 
Water transpired per gram dry matter (grams) 
276 
249 
Water transpired per gram ash content (kilograms) 
5.01 
4.29 
Ash content (per cent) 
5.53 
5.82 
Total dry matter (grams) 
439 
411 
