POTATO BKEEDING AND SELECTION". 



29 



Potato tuber-unit progeny record {2d or . . year selection). 



Accession No Tiiber-unit No Variety Selected 191... 



Selection made by P. O. address 



Selected unit yielded tubers, of which were large (weight, lbs oz.); were 



small (weight, lbs oz.). 



Selected tubers planted, , 191 . . . Character of soil 







Sprouts. 



Plants. 



Tubers. 



-d 





1 





3 



S a 



>■■'§ 





a a 



Ot3 



a* 



a 



Weight. 



Pi 



a 



OQ 



Weight. 



Total. 



s 



V 







1 

 P. 

 P< 



< 



eg 



o 



O 



PI 

 g 



o 



o 



o 



1 



! 



1 i 





























1 ! ' 1 





















j 







! i i i 





























II 1 ■ 































1 i 1 































i ! 1 

































' 1 i 

















. 



" 















J 



1 

































1 



! 

































1 



1 































Total... 





































! 





! 

























Aver- j 

 age . . 



1 



































































GcTKral obscrvationx.- 



DEPARTMENTAL INVESTIGATIONS. 



During the season of 1911 rather extensive studies were undertaken 

 ])y tlie OfFioe of Horticultural Investigations and the Arlington 

 Experimental Farm (now the Office of Horticultural and Pomological 

 Investigations), looking toward the standardization of a considerable 

 varietal collection by the tuber-unit method. This work was carried 

 on at llonooye Falls, N. Y. Hill selections were also made the same 

 season in a field of Tri.sh Cobblers near Portsmouth, Va. 



TUBER-UNIT STUDIES. 



In HU 1 some 150 standard commercial varieties of potatoes 

 wore ])lanted on the tuber-unit basis (PI. XIV), in order that their 

 ))urity and unif(jrmity in size and type might be more closely studied. 

 The seed used wus grown in Burlington, Vt., in 1010, on land which 

 liad not gi-own a cultivated crop of any kind for ut least 1^5 years. 

 In addition to this, the seed was selected from the most ])roiiiising 

 hills at the time tlie cro]) wiis harvested. Tlie tul)ers us a whole 



