WATER REQUIREMENT OF DIFFERENT KINDS OF PLANTS. 
83 
Table LXXII. — Summ a r y of water requirement determinations for different crops as 
influenced by climate. 1 
Crop. 
Lawes, 
1850, 
Rotham- 
sted. 
Eng- 
land. 
Wollnv. 
Hell- 
riegel, 
1883, 
M ™* h ' i Dahme, 
_ Ge _ r : ! Ger- 
Madison. 
Wis. 
Von Seel- 
lSs98. **{$«*■ 
■ Gott - S. 
^eV^ ^tah. 
manv. 
Leather, i and 
1910-11. ' Shantz, 
Pusa. | 1913. 
India. Akron, 
Colo. 
Wheat 
Oats 
235 
665 
774 
359 
401 
297 
377 
54i' 
388 
350 " 
333 
546 
554 
469 
468 
507 
614 
Barlev 
258 
' 
539 
Rve ' 
- 
724 
Corn 
233 


386 
337 
437 
369 
306 
Millet 
447 
275 
214 
23.5 
251 
Peas 
416 
292 
330 
477 
481 
M 
563 
soo 
Clover (red) 
709 
\haha 
1.068 
263 
373 
818 
- 
912 
843 
490 
371 
337 
i78 
Rape 

441 
496 


423 
28 
44S 
807 
263 
312 
635 
811 
212 

Rice 

377 
336 
MS 
76-5 
1 Summari: rpect to crops without respect to varieties. Includes only crops grown to ma- 
turity. The data are not strictly comparable, even in the case of a single investieation. The reader should 
consult the detailed discussion of each investigation in the earlier portions of this bulletin. 
Lawes, working in England, obtained a lower value for the water 
reqiiireinent than any other investigator. Hellriegel and Yon Seel- 
horst. in Germany, both obtained comparatively low values, while 
Wolkiy's results are comparatively high. King, working in Wis- 
consin, obtained lower values than the writers obtained in north- 
eastern Colorado. Widtsoe's results at Logan. Utah, agree closely 
with those of the writers, being from 4 to 7 per cent higher for all 
crops except the sugar beet, which was 32 per cent higher. Leather, 
at Pusa. India, obtained lower values for oats, barley, corn, and 
peas, but higher values for wheat and sorghum than did the writers. 
Wollny's results are higher than the writers' in every case where the 
same crop was grown, with the single exception of corn. 
The relative positions of the different crops vary greatly in the 
different investigations. "Wheat and barley alternate, wheat having 
the higher water requirement in Hellriegel's and Leather's deter- 
minations and barley ranking higher in Lawes' s, Von Seelhorst's, and 
