28 



Journal of Agricultural Research 



Vol. III. No. I 



the last cutting was made. The following values (Table XVIII) were 

 obtained for the water-requirement ratio: 



T.^BLE XVIII. — Summary of water-rajuiremcnt measurements of legumes at Akron, 



Colo., in igi2 



Crop. 



Alfalfa, Grimm 



Alfalfa, Grimm, A. D. I. selection. 



Clover, sweet 



Chick-pea 



Cutting. 



592 ± 13 

 6oo±i7 

 547 ±12 



790±io 

 853 ±13 

 677±i4 



Third. Combined. 



506 ±5 

 421 ±10 

 598±i8 



65g±6 

 657±ii 

 638±4 

 5io±i4 



The two alfalfas and the sweet clover were planted on the same day, 

 and the crops in each instance were all cut on the same day, so that the 

 results in the Table XVIII are comparable. The A. D. I. strain of 

 Grimm alfalfa gave a slightly higher ratio than the unselected Grimm 

 during the second period, but lower during the third period, when it made 

 a better growth. (See "Dry matter," column 3, Table XIX.) Sweet 

 clover, as in 191 1, proved somewhat more efficient than alfalfa during 

 the first and second periods. During the third period sweet clover was 

 less efficient than alfalfa. 



The chick-pea proved the most efficient of the legumes tested. Its 

 growth period does not coincide with that of the other legumes, but 

 approximates a combination of the lirst and second periods. (See Table 

 XIX.) It thus appears to be distinctly more efficient in the use of water 

 than either alfalfa or sweet clover. Chick-pea has, however, a relatively 

 high water requirement compared with the small grain crops, which is in 

 accord with Leather's measurements (Leather, 1910, p. 156). 



Table XIX. — Water requirement of different legumes at Akron, Colo., in igi2 



