Oct. 15. 1914 



Wafer Requirement of Plants 



the plants at the time of transplanting. The three remaining varieties 

 show somewhat greater differences than in 191 1 , and the order is reversed. 

 The probable error of the water requirement of emmerin the 191 1 exper- 

 iments was abnormally high, so that the 1912 series (PI. Ill, fig. 4, 

 and PI. VII, fig. 4) may be considered more nearly representative of 

 the relative position of this crop. 



The water requirement of different varieties based on grain production 

 is as follows : 



Variety of wheat Water requirement 



Emmer (including glumes) 984±iS 



Turkey 995±22 



Kharkov i, o64±6o 



Kubanka i, in ±37 



Emmer (without glumes) i, 243 ±23 



Spring Ghirka i,468±34 



Bluestera i, 573 ±49 



In order to reduce the results obtained with emmer to a basis com- 

 parable with the other varieties, the calculations should be made upon 

 the weight of the grain without the glumes, which constitute about 21 

 per cent of the total weight. When this is done, it will be seen that the 

 water requirement of the different varieties based on grain production 

 follows the same order as when based on the production of dry matter. 

 The Turkey wheat again gives the lowest value for the water require- 

 ment, although the Turkey, Kharkov, and Kubanka may be considered 

 substantially in agreement when the errors of the experiment are con- 

 sidered. The detailed results are given in Table V. 



T.\BLE V. — Water requirement of different -varieties of wheat at Akron, Colo., in Ipl? 



and 1 91 2 



