Sept. I, 1920 



Line-Selection Work with Potatoes 



563 



EARLY SIX WEEKS TUBER LINES 517 TO 622 



While these lines were selected from stock being grown under the 

 name of Early Six Weeks, they all seem more typical of Red Early 

 Ohio. At first a mixture of Early Ohio and Early Six Weeks was sus- 

 pected, but observations on vine characteristics have led to the belief 

 that the less vigorous lines, more typical of Early Six Weeks, are nothing 

 more than degenerate types of Early Ohio. Such types are constantly 

 appearing within vigorous dark green lines typical of Early Ohio. With 

 this explanation I will still refer to these as Early Six Weeks lines. Varie- 

 ties of the Early Ohio types have proved very satisfactory under soil 

 and climatic conditions at the Station, yielding much better than other 

 standard early varieties like Irish Cobbler and Early Triumph, and with 

 less tendency to degeneration. 



The 3 -year performance record of these 100 lines is presented in Table 

 XVIII. The average annual yield has followed about the same curve as 

 in the other two varieties. There has apparently been ample variation 

 between lines in any one season and in the 3 -year average to furnish a 

 basis for selection. As in the other varieties, however, these variations 

 in yield have in many cases been rather inconsistent. 



Table XVIII. — Three-year summary of yields of marketable tubers per acre from loo 



Early Six Weeks tuber lines 



Tuber line No. 



517 



518 



519 



520 



522 



523 



524 



525 



526 



527 



528 



529 



530 



531 



532 



533 



534 



535 



536 



537 



538 



539 



540 



541 



542 



543 



545 



546 



547 



548 



417°— 20 4 



1916 



Pounds. 



I5>099 

 16, 261 



10, 453 

 9,872 



12,195 

 12,195 

 i3>357 

 14,518 

 12,776 



13,357 

 11,615 



13,938 



15,099 



12,776 



16, 261 



16, 261 



11,615 



6, 969 



8,711 



11,615 



9,292 



7,549 

 8,711 



11,615 

 9, 292 



12,776 

 6, 969 

 9,872 

 9, 292 



11,034 



Pounds. 

 20, 907 

 21,681 



24, 159 

 24, 004 

 28, 340 

 20, 907 



21,371 

 16,958 

 23, 230 

 19,977 

 22, 300 

 26, 482 

 22, 765 



27,565 

 22, 997 



25,320 

 14, 402 

 22, 765 

 25,088 

 22, 300 



19,977 

 21,836 



24, 159 

 22, 765 

 20, 648 

 18,351 

 17,654 

 25, 088 

 24, 624 

 26,017 



1918 



Pounds. 



19,513 

 8,802 



17,654 

 11,247 

 19. 804 

 13,692 

 13, 008 

 21, 271 



20, 293 

 II, 150 



12, 469 

 18,351 

 15, 099 

 22,713 

 18, 584 

 21,271 



15, 099 

 16,725 



18, 119 



15,331 

 11,615 



19, 048 



19,977 



21, 603 

 18, 119 



22, 300 

 7,652 



22,765 



13, 473 



25, 320 



3-year 

 average. 



Pounds. 

 18,506 

 15,581 

 17,422 



15,041 



20, 113 



15, 598 

 15,912 

 17,582 



18, 766 

 14,828 

 15,461 

 19, 590 

 17,654 



21, 018 



19, 280 



20, 950 



13, 705 

 15,486 

 17,306 



16,415 

 13,628 



16, 144 



17,615 



18, 661 

 16, 019 

 17,809 

 10, 758 



19, 308 



15, 796 



20, 790 



