556 



Journal of Agricultural Research 



Vol. XIX, No. II 



" The lines printed in bold-face type also appear in the group with good vine characteristics. This leaves 

 10 of the 19 lines with vines suggesting degenerate tendencies. Average of group, 29,267 potinds per acre. 



RURAL NEW YORKER TUBER LINES 409 TO 516 



Rural New Yorker has ranked very high in the variety tests conducted 

 at this Station. Experience would lead to the belief that, with the 

 possible exception of Russet Burbank, no main crop variety tested in 

 these experiments will give more uniformly satisfactory results upon 

 heavy types of irrigated land. Usually little difficulty is experienced in 

 maintaining good, vigorous stock where the seed is carefully selected 

 after the digger. The average yield of all strains of Rural tested in 191 6, 

 191 7, and 1 91 8 was 13,449 pounds of marketable tubers per acre. It 

 will be noted that the average yield of the 108 tuber lines for the same 

 period was 16,820 pounds. The 3-year performance record of these 

 lines is presented in Table X. Here, as well as in Table II, it is interesting 

 to note the variation in the average annual yield of all lines for the three 

 seasons. Within any one season the variation between tuber lines is 

 not so pronounced as it is in Green Mountain; but as yet none of these 

 lines has reached the final stage of degeneration as several Green Mountain 

 lines have. No effort is made to draw conclusions from Table X as a 

 whole, but in Tables XI and XII an effort has been made to present a 

 portion of the data included in Table X in such form that we may get 

 some idea of the value of a 3-year performance record in isolating high- 

 yielding lines. 



Table X. — Three-year summary of yields of marketable tubers per acre from 108 Rural 



New Yorker tuber lines 



Tuber line No. 



1916 



409 

 410 

 411 

 412 



413 

 414 



415 

 416 



417 

 418 

 419 

 420 

 421 



Pounds. 

 12,776 

 9,872 

 9,292 



13,357 

 9,292 

 9,872 



12, 776 



12,776 

 8,130 

 4,065 



11,034 



7,549 

 8,711 



Pounds. 

 22, 007 

 20, 907 

 22, 300 

 26,327 

 27, 876 

 23,230 

 25,919 

 21,371 

 24, 623 

 17,869 

 24, 159 

 24, 159 

 25,088 



1918 



Pounds. 

 17, 422 

 18,351 

 22,956 



24, 939 

 15, 648 

 26, 585 

 23, 961 

 28, 108 

 22, 683 

 14, 867 

 20, 442 

 20, 442 

 18, 584 



3-year 

 average. 



Pounds. 



17, 401 

 16,376 



18, 182 

 21, 541 



17, 605 



19, 895 



20, 885 

 20, 751 

 18,478 

 12, 267 



18, 545 

 17,383 

 17,461 



