CEREAL EXPEEIMENTS AT THE AKRON FIELD STATION. 



19 



Table XII. — Annual and average yields of Kharof winter ivheat in a date-of-seeding 

 test at the Akron Field Station, Akron, Colo., in 1911, 1913, 1914, and 1915. 



Date of seeding. 



Yield per acre (bushels). 



1911 1913 1914 1915 Average, 



Sept. 16 to 30, inclusive. 

 Oct. 1 to 15, inclusive. . . 

 Oct. 16 to 31, inclusive . . 

 Nov. 1 to 30, inclusive . . 



15.5 

 16.1 



15.6 

 15.6 

 12.6 



8.6 



26.0 

 26.6 

 11.3 

 13.6 



27.3 

 34.2 

 25.8 

 26.6 



21.1 



23.1 



16.6 



15.1 



a Three-year average. 



The sowings made during tlie first 15 days in October have given 

 yields as high as or higher than those from any other date of seeding 

 dming the last three years of the test. In 1911 an early sowing 

 (Sept. 6) gave the highest yield, 16.8 bushels, and a late sowing 

 (Nov. 11) ranked second. The average of the yields from sowings 

 made between September 15 and October 15 is 22.1 bushels, which 

 is 5.5 bushels higher than the yield from sowings made during the 

 following 15-day period. 



SPRING WHEAT. 1 



Spring wheat is an important crop in this section of the Great 

 Plains. It can be sown early on land prepared during the late fall. 

 It has given good yields when conditions were favorable. The vari- 

 eties which have given the highest yields are durum wheats. In 

 addition to the varietal experiments, a rate-of-seeding test has been 

 conducted with Amautka durum wheat since 1911. 



VARIETAL EXPERIMENTS. 



Experiments with spring wheat have been conducted both on field 

 plats and in the nm-sery. These will be discussed separately. 



PLAT EXPEEIMENTS. 



A total of 44 varieties of spring wheat have been grown in field 

 plats for one year or more. Table XIII shows the annual and average 

 yields of these varieties, arranged in groups according to their rela- 

 tionships. 



Seven varieties of durum wheat have been grown continuously 

 during the eight years. Pehssier (C. I. No. 1584) has given the 

 highest average yield, 22.4 bushels per acre. Velvet Don (C. I. No. 

 1445) ranks second, and Amautka (C. I. No. 1493) is third. The 

 fourth variety in rank is the Galgalos (C. I, No. 2398), a soft white 

 common wheat which belongs to none of the groups grown commer- 

 cially. Amautka 6Pl (C. I. No. 4064) has given an average yield 

 of 27.6 bushcLs per acre for the six years in which it has been grown. 



' For a 'Usciisslon of the groups and varieties of luird spring wheat, see Ball, C. R., and Clark, J. A., 

 Varieties of hard .spring wheat. U. 8. Dept. Agr., Farmers' Bui. 080, 20 p., 7 fig. 1915. 



