64 



BUllLETIX 1039, U. S. DEPAETMEXT OF AGEICLTLTUEE. 



The yields of the wheat, flax, and the mixtures of both are shown 

 in Table XL VII. 



Table XLYII. — Yields of flax and wheat separately and mixtures of these crops 

 groirn on irrigated land on the Belle Fourche Experiment Farm in 1917 

 and 1918. 



Crop. 



Rates of seeding and yields per acre 

 (pounds)". 



Seeding. 



Yields. 



1917 



191 S Average. 



Flax 



Mixture{^-;:;;;;;;;;:;:;:;;:::;:::::::::::::::::::::::;:::: H } 



Wheat 37 



™-K^k^v;;:::::::;::::::::::::::::::::::;:;:;:::::::::: tI 



"Wheat 75 



941 

 1,150 

 1,100 

 1,-125 

 1,300 



S67 

 1,408 

 1,308 

 1,467 

 1,442 



904 

 1,279 

 1,204 

 1,446 

 1,371 



Larger total j'ields of wheat and flax were obtained from the mix- 

 tures than from either crop grown alone. Wheat predominated in 

 the mixtures. • The value of the practice of growing the mixture 

 of wheat and flax will depend on the relative prices and yields of the 

 two crops. The cost of separating the thrashed crop must also be 

 considered. It was necessary to let the wheat stand for some time 

 after it was rij^e before the flax could be harvested, and it was also 

 rather difficult to thrash the flaxseed without cracking man3^ of the 

 wheat grains. 



COMPARISON OF GRAIN CROPS. 



In 1912, 1913, and 1914 the only small grains grown in the cereal 

 experiments under irrigation were spring varieties of wheat, oats, 

 barley, and emmer. In 1915 and since several additional grains have 

 been grown. The annual and average yields of the leading varieties 

 of each of the grains grown in 1915 and later are shown in Table 

 XLVIII. 



Winter wheat and winter rye were grown during only four of the 

 five years from 1915 to 1919, inclusive, while winter spelt, winter 

 emmer, proso, and buckwheat were grown only two years each. In 

 terms of pounds of grain per acre, winter wheat gave the highest 

 yield in 1915, oats in 1916 and 1919, spring wheat in 1917. and barley 

 in 1918. Chevalier II barley has outyielded all other grains during 

 both the 4-year and the 5-year periods, for which the average yields 

 are shown in Table XLVIII. Vernal spring emmer and White Rus- 

 sian oats gave the next highest yields of grain. Winter emmer, win- 



