36 



Journal of Agricultural Research 



Vol. Ill, No. 



duction of a pound of dry matter. The total dry matter produced by 

 Peruvian was, however, much less. The water requirement for each of 

 the several cuttings made of these crops is shown in Table XXI. 



Table XXI. — Water requirement of different cuttings of legumes 



Crop. 



First 

 cutting. 



Second 

 cutting. 



Third 

 cutting. 



Combined 

 cutting. 



Alfalfa, Peruvian 



Clover, red 



Alfalfa, Grimm. .. 

 Vetch, hairj' 



651 ±i6 

 7i8±ii 

 804 ±9 



853 ±23 



725±i8 

 876±i4 

 878±8 

 56o±io 



596±i2 



i,oi5±49 

 8i8±ii 



65i±i2 

 789 ±9 

 834±8 

 690 ±8 



Taking the water requirement of the first cutting in each instance as 

 a basis of comparison, the second crop of Grimm alfalfa required 8 per 

 cent more water, Peruvian alfalfa 1 1 per cent more, red clover 22 per 

 cent more, while hairy vetch required 34 per cent less. On the same 

 basis the third cutting of Grimm alfalfa required 2 per cent more water 

 than the first, 8 per cent more for Peruvian, and red clover 41 per cent 

 more. Comparing the combined cuttings, Peruvian alfalfa and hairy 

 vetch required 18 per cent less water than Grimm, and red clover 5 per 

 cent less. Grimm alfalfa was the only one of the lupines grown at Akron 

 during both 1912 and 1913. Its water requirement in 1912 was 659J: 16; 

 in 1 91 3, 834 ±8, an increase of 27 percent. 



ALFALFA, SUDAN GRASS, AND MILLET GROWN DURING THE LATE 

 SUMMER AND AUTUMN AT AKRON, COLO., IN 1912 



In Table XXII are given the results of water- requirement measure- 

 ments based on the total dry matter produced by crops grown during 

 the late summer and autumn and planted in pots which had already 

 produced a crop earlier in the season. The soil was not changed, 

 and no additional fertilizer was added. These forage crops can not be 

 said to have been grown out of season, except in that the plantings were 

 made too late in the season to permit the plants to reach their full 

 development before harvesting. 



Table XXII. — Water requirement of alfalfa, Sudan grass, and millet grown during the 

 late summer and autumn at Akron, Colo., in Igi2, without additional fertilizer. 



