Oct. 23, 1916 Daily Transpiration during Normal Growth Period 
175 
time of cutting. Various crops show their individuality by departing 
more or less from these types. By comparing the transpiration of two 
crops during any period with their total transpiration the relative 
demand of the crops for water during this period can be shown. Such 
a comparison is given in Table V for the 10-day period in 1914 from 
July 7 to 16, inclusive, which represents a period of maximum transpira¬ 
tion activity. 
TablU V .—A comparison of transpiration during the 10-day period July 7 to 16, IQ14 » 
with total transpiration of crop 
Croj 
Total trans¬ 
piration. 
Transpiration 
period Ji 
Actual. 
during to-day 
lly 7-16. 
Percentage of 
total. 
Kgm . 
Kgm. 
Wheat, Kubanka. 
160 
40. 0 
25 
Wheat, Galgalos. 
186 
46.9 
25 
Oat, Swedish... 
158 
43*4 
27 
Oat, Burt... 
154 
40. $ 
26 
Barley. 
91 
22. 0 
24 
Rye.... 
121 
3 °-s 
25 
Cowpea. 
112 
3*-7 
28 
Lupine. 
76 
17. 2 
23 
Millet, Kursk. 
89 
23-9 
27 
Millet, Siberian. 
IOO 
25-7 
26 
Com, Northwestern Dent. 
112 
27. < 
2< 
Com, Algeria. 
137 
26.9 
20 
Sorghum, Minnesota Amber. 
I30 
26.8 
21 
Sorghum, Dakota Amber. 
126 
26.2 
21 
Sudan grass (in inclosure). 
no 
29.0 
26 
Sudan grass (in open). 
88 
21.9 
25 
The relative transpiration of the small grains during this period was 
very nearly the same, ranging from 24 to 27 per cent of the total trans¬ 
piration. This group, including the millets, shows a uniformity in this 
respect which is remarkable. Sudan grass, grown both outside and 
inside the screened inclosure, showed a relative transpiration loss during 
this period agreeing closely with the small grains. The same is true 
with Northwestern Dent com, an early-maturing variety. Algeria com 
and the two varieties of sorghum, on the other hand, show a lower rela¬ 
tive transpiration during this period, owing to the fact that they mature 
later than the other crops considered. 
Similar data covering a 10-day period in August are presented in 
Table VI. All of the crops show a lower transpiration than during the 
July period, except Sudan grass and Algeria com, which had not yet 
begun to ripen. 
Amaranthus and the alfalfas were cut the second time at the end of 
this period. The ratios show that nearly one-half of the total water 
used by the alfalfas in the production of the second crop was transpired 
during this 10-day period. In the case of Amaranthus the percentage 
was even greater. 
