46 



BULLETIN 1039, U. S. DEPAETMEI^s^T OF AGEICULTT'EE, 



soil was dry enougli to be in condition for seeding before the irrigated 

 land. This favored higher yields from the dry land. 



On the whole, the yields fi'om the cereal plats on irrigated land are 

 considerably higher than the average for the region, where the condi- 

 tions, as on the Belle Foiirche Experiment Farm, usually are not 

 favorable for maximum grain yields. 



EXPERIMENTS WITH WHEAT. 



SPRING WHEAT. 



VABIETAL EXPEPJMENTS. 



Ten varieties of spring wheat have been grown in the experiments 

 on irrigated land. Three of these were grown during the entire 

 period from 1912 to 1919. The experiments were on rather poor soil 

 from 1912 to 1915. The seeding was late in 1915. In 1916 the wheat 



COMMON 



Pf?£STON: 



CH/9MPL/9/N 



y/£LD P£R/9C/f£ 

 to /S 20 



^30 



Fig. 14. — Diagram showing the average yields, in bushels per acre, of the leading varieties 

 of spring wheat on irrigated land at the Belle Fourche Experiment Farm for the 6-year 

 period from 1914 to 1919, inclusdve. 



was damaged by soil blowing and also was severely attacked by rust. 

 Good yields of most varieties of spring wheat were obtained in 1917, 

 1918, and 1919. The yields of the spring- wheat varieties on irrigated 

 land are shown in Table XXXIII. The average yields for six years 

 also are shown in figure 14. 



The average yield of the Kubanka variety during the 8-year 

 period, 1912 to 1919, inclusive, was 25.2 bushels per acre. During 

 this same period Power yielded 20.8 bushels and Haynes Bluestem 

 18.6 bushels per acre. During the 6-year period, 1914 to 1919, in- 

 clusive, Kubanka yielded an average of 27 bushels per acre. The 

 next highest yielding variety was Champlain. which produced 22 

 bushels per acre. Marquis during this period yielded only 20 bushels 

 per acre. This was partly due to poor growth in 1917 and 1919. In 

 1917 the Marquis was sown at 4 pecks per acre, by mistake, while 

 the other varieties were sown at the rate of 5 pecks per acre. The 



