24 



Journal of Agricultural Research 



Vol. Ill, No. I 



for comparison with the Akron measurements. The computed values 

 for Akron are given in Table XV. 



Table XV. — Observed water requirement of varieties of sorghum at Amarillo, Tex., and 

 computed water requirement for Akron, Colo., in IQ13 



Variety. 



Dwarf BlackhuU kafir 



White kafir 



Early BlackhuU kafir. 



White mile 



KafirXdurra 



Feterita 



It will be noted (Table XV) that Dwarf BlackhuU kafir and iMinnesota 

 Amber sorghum were the most efficient in the use of water of the eight 

 varieties of sorghum tested at Amarillo in 191 3. The least efficient was 

 feterita. The kafir Xdurra hybrid had practically the same water 

 requirement as feterita. The latter has been extensively featured 

 recently as a drought-resistant crop particularly adapted to the South- 

 west. It does not appear, however, that its drought-resistant qualities 

 are ascribable to an efficiency in the use of water, this variety being the 

 highest in water requirement of all the sorghums tested at Amarillo in 

 1913. Vinall and Ball (1913, p. 27) have suggested that the success of 

 feterita during recent dry years has been due to a thin stand resulting 

 in part from poor germination. When grown under identical conditions 

 as to stand, it showed no greater drought resistance than milo or kafir. 



Table XVI. — Water requirement of sorghum at .Amarillo, Tex., in IQIJ 



