16 



BULLETIJSr 402, U. S. DEPAETMENT OF AGEICULTURE. 



made in the fall, but some plats were recorded as having good stands. 

 The causes for the failure shown by zero yields in 1909 are not appar- 

 ent. The formaldehyde treatment was charged with the failure at 

 the time, but winterkilling was more probably the cause. Enough 

 seed was obtained from most of the varieties for resowing. The crop 

 was not sufficiently large, however, to pay the cost of harvesting, 

 and for that reason the yields are recorded as zero. This year is 

 included in calculating the average yields. 



Table IX. — Annual and average yields of 17 varieties of winter wheat grown at the 

 Akron Field Station, Akron, Colo., in the 8-year period, 190S to 1915, inclusive. 





C^I. 



No. 









Yield per 



icre (bushels). 







Group and variety. 



1903 



1909 



1910 



1911 



1912 



1913 



1914 



1915 



Average. 



All 

 years 

 grown. 



Six 

 vears, 

 1910 to 

 1915. 



Crimean: 



Alberta Red 



2979 

 1543 

 1432 

 1436 

 1437 

 1559 

 1442 

 1583 

 4207 

 2908 

 1539 

 1558 

 1571 

 2998 



3330 

 1305 

 1438 



21.1 



"19." 2" 

 19.1 

 14.6 











'23.'6" 



12.5 





17.8 

 12.5 



31.1 

 24.5 



31.3 



18.4 



19.0 



19.8 









Crimean . ... 









Do 





 



38.3 

 34.8 

 36.9 

 27.9 

 29.8 



17.9 

 13.3 

 11.5 

 10.0 

 14.2 

 10.3 

 17.3 



33.1 

 32.5 

 32.7 

 34.3 

 37.5 

 33.2 

 35.4 



12.6 

 14.0 

 17.0 

 16.1 

 16.6 

 18.5 

 18.1 



28.3 

 2.5.3 

 39.6 

 26.6 

 25.9 

 26.1 

 30.1 



26.6 

 26.6 

 29.0 

 27.6 

 29.2 

 28.3 

 30.5 



22.0 

 20.2 

 27.8 

 20.4 

 21.6 

 23.3 

 26.4 

 20.6 



26.1 



Do 



24.3 



Do 



27.8 



Kharkof 



20.6 

 19.3 





 



23.7 



Do 



25.5 



Kliarlcof, 6P4 











26.8 

 20.6 



26.4 



Torgova 









Turlcey 



15.8 

 19.8 

















Do 







29.6 



11.5 



43.2 

 28.8 



17.5 



'38."3' 



7.3 

 6.8 



6.5 

 12.8 

 17.3 



25.1 

 25.0 



13.8 

 30.5 

 24.0 



28.1 

 23.3 



26.6 

 26.4 

 22.8 



20.6 

 21.0 



16.1 

 18.0 

 21.5 



24.1 



Do. 





Miscellaneous: 



BuffumNo. 17 













Diehl Mediterranean 



10.4 

 15.6 





 



37.1 

 38.5 



8.9 

 15.8 



26. i 







The yields in 1910 were high, due to the favorable distribution of 

 precipitation. In 1911 a lack of moisture caused the lowest yields 

 of any of the years for which yields are recorded. The average 

 yield of all varieties of the Crimean group in 1911 was 12.7 bushels 

 per acre. 



The year 1912 again gave high yields, the average for the Crimean 

 group being 34.5 bushels per acre. This is 4 bushels more than the 

 next highest yield, 30.5 bushels per acre, produced in 1910. 



The crops of 1914 and 1915 were only of ordinary size. It is well 

 to note that the yield of grain was not increased in proportion to the 

 increased rainfall of the year 1915. This is due to unfavorable dis- 

 tribution, which resulted in a lack of moisture during ripening. 



Six varieties have been tested during the 8-year period. Of these, 

 Crimean (C. I. No. 1436) has given an average yield of 22 bushels per 

 acre. The second in rank is Kharkof (C. I..N0. 1583), with an average 

 yield of 21.6 bushels. In 1910 two varieties of promise were intro- 



