CLASSIFICATION OF AMERICAN WHEAT VARIETIES. 



11 



commercial varieties have been given the most careful study. Many- 

 varieties not previously known were obtained and grown. Each 

 year the varieties studied during the preceding season, with all new 

 material obtained, were grown in the classified order presented herein. 

 Each year, therefore, the classification became more definite and 

 complete. There still remains much to be learned about the Ameri- 

 can varieties, but it is thought that publication of the information 

 compiled to date should no longer be delayed. 



CLASSIFICATION NURSERIES. 



Classification nurseries have been grown in several widely sepa- 

 rated sections of the United States. This was necessary in order 

 to determine the expression of varieties under different environments 

 and thus embrace a scheme of classification which would be workable 

 wherever the varieties happened to be grown. It also guarded 

 against the loss of certain types, which often results if wheat is 

 grown at only one place. In Table 1 is shown the location of 18 

 experiment stations where classification nurseries have been sown, 

 as well as the annual and total number of sowings which were made. 



Table 1. — Annual and total number of rotes sown in the classification nurseries 

 of fall and spring wheat at one or more of 18 experiment stations in the 

 United States during the 6-year period from 1915 to 1920, inclusive. 





1015 



1916 



1917 



1918 



1919 



1920 



& a 



Station. 



a 

 fc 



bo 



'u 

 ft 

 02 



73 



en 



bo 



ft 

 m 



03 



tab 



_g 

 ft 



02 





bo 



PI 



ft 



02 



« 

 fq 



bh 



a 



ft 

 m 



"o3 



tub 



.3 



m 



bib 



CSS fe 



Chico, Calif 



146 





790 





902 





950 

 9*4 

 950 



1,091 

 1,091 



720 

 495 

 495 

 186 



720 

 495 



1,419 

 480 

 235 

 126 



480 

 480 

 109 



5,647 

 3,985 









152 



691 



313 



1,804 



554 



6 765 







421 







164 



307 

 430 



313 











784 



Nephi, Utah 





















430 



Bozerhan, Mont 





















126 





126 







680 



302 



619 















1,299 



Akron, Colo 





















302 



Fort Collins, Colo 





















126 





126 



Williston, N . Dak 













554 











554 



Dickinson, N. Dak 





787 





















787 



Newell, S. Dak 







619 



















619 



St. Paul, Minn 





657 





















657 







534 





















534 







550 





















550 











736 

 301 





523 









235 





1,494 

 301 



Ithaca, N. Y... 











































Total 



146 



2,990 



3,054 1.864 



3, 743 



1,108 



3,367 



2,182 



1,896 



1,215 



2,747 



1,009 



25,381 









Table 1 shows that during the six years 1915 to 1920 more than 

 25.000 :-:< pa rate sowings were made Most of these were made at 

 experiment stations in the western United States. The greatest num- 

 ber of sowings at any one station, totaling (5,705, was made at the 

 Sherman County branch station at Moro, Oreg.; the second greatest, 

 5,647, ;it the Want-Introduction Garden, Chico, Calif.; and the third 



