558 



Journal of Agricultural Research 



Vol. XIX, No. II 



Table X. — Three-year summary of yields of viarketable tubers per acre from lo8 Rural 

 New Yorker tuber lines — Continued 



Tuber line No. 



483 



484 



485 



486 



487 



48S 



489 



490 



491 



492 



493 



494 



495 



496 



497 



498 



499 



500 



501 



502 



503 



504 



505 



506 



507 



508 



509 



510 



511 



512 



513 



514 



515 



516 



Averas;e 



1916 



Pounds. 



io>453 



11,615 



9,292 



8, 711 

 II, 615 



10, 453 



9, 292 



5, 207 



6, 969 



10,453 



11, 613 

 8, 711 



II, 615 

 9,872 

 12, 195 

 13.' 938 

 io> 453 

 8, 130 



8, 130 

 4, 646 

 4, 646 

 6, 969 

 6,388 

 4, 646 

 9,872 



4, 646 



5, 226 



7.549 

 8,711 

 4, 646 



8, 711 



6, 969 

 6, 969 

 6, 969 



9, 292 



8,831 



Pounds. 

 16, 725 

 18, 584 



16, 261 

 12, 195 

 20, 907 



17,654 



18, 119 



19, 048 

 18, 584 

 18, 584 

 22, 300 

 23, 694 



18, 584 



20, 442 



19, 048 



i9> 513 

 23, 694 



19,513 



21, 029 



22, 300 

 22, 765 

 22, 765 



20, 907 

 23,230 



18, 584 

 24, 623 



19, 048 



21,371 



21, 029 

 25, 088 

 21,836 



22, 300 

 22, 300 

 22,300 

 22, 300 



17, 190 



1918 



Pou^ids. 

 17,035 



20, 538 

 11,247 



17,551 



18, 119 

 24, 049 



21,371 



19, 048 

 22, 494 

 13, 692 

 17,887 

 23,488 



18, 826 



16, 260 



19,315 



21, 760 



20, 674 



22,455 



17, 190 

 14, 670 

 22, 765 



19, 977 



19, 513 



20, 442 



18, 093 



20, 049 



21, 516 



17,115 

 12,389 



25,552 



19, 560 



19, 560 



20, 674 

 20, 442 



17,654 

 20, 907 



21, 864 1 19, 787 



3-y«jr 

 average. 



Poun 

 14 

 16 

 12 

 12 

 16 



17 

 16 



14 

 16 



14 

 17 

 18, 

 16 



15 

 16 

 18 

 18 

 16 

 15 

 13 

 16 

 16 



15 

 16 



15 

 16 



15 

 15 

 14 

 18 

 16 

 16 

 16 

 16 

 16 

 15 



ds. 



737 

 912 

 266 

 819 

 880 



385 

 260 



634 

 015 

 243 

 266 



631 

 341 

 524 

 852 

 403 

 273 

 699 

 449 

 872 



725 

 570 

 602 

 106 

 516 



430 

 263 



345 

 043 

 428 

 702 

 276 

 647 

 570 

 415 

 409 



16, 820 



The data included in these tables indicate that with few exceptions 

 high-yielding lines are not consistent high yielders, neither are all low- 

 yielding lines consistent low yielders. The following brief field notes 

 taken in 191 8 do not indicate that yield records will be found very satis- 

 factory in dealing with degeneration. For instance, line 448 has a very 

 good performance record. It ranked first in 1916, appeared among the 

 highest-yielding 20 in 191 8, only missed b}- a narrow margin a place 

 among the best 20 in 1917, and ranks seventh according to the 3-year 

 average. But unless the vine characteristics are very deceiving, its 

 yielding power will drop at least 50 per cent during the next two years. 

 One-third of these lines with promising performance records contained 

 some plants with degenerate tendencies. The field notes of 191 8 indicate 

 to what extent degeneration appears among the lines that have ap- 

 peared for at least two out of three years among the 20 highest-yielding 

 or would be ranked with the 20 highest according to the 3-year average. 



