14 



Journal of Agricultural Research 



Vol. Ill, No. I 



Table VII. — Water requirement of different varieties of barley at Akron, Colo., in IQ12- 



Continued 



RYE 



The measurement of the water requirement of spring rye at Akron 

 in 191 1 showed a surprisingly high figure — 54 per cent above that of 

 Kubanka wheat. The 191 2 measurements (Table VIII) gave 496 ±9 

 for the water requirement of rye when based on dry matter and i ,802 ± 62 

 when based on grain production. The 191 2 (dry matter) ratio is thus 

 about 26 per cent above Kubanka wheat, a marked increase in the rela- 

 tive efficiency in comparison with the 1911 ratio. In fact, rye exhibited 

 the greatest reduction in water requirement of all the crops tested in 

 1912. 



A consideration of the water requirement of crops grown out of season 

 in 191 1 showed that rye was unusually efficient during the cool fall 

 period. This result as well as the increase in efficiency in 191 2 suggests 

 that rye may be unusually responsive to climatic conditions and that 

 it is relatively better adapted to low temperature than the other small 

 grains. 



Table VIII. — Water requirement of rye at Akron, Colo., in igi2 



