174 



THE POTATO 



np-x-t larger, and so 

 tuber weighing over 



crop consist of small tubers, tht 

 on, does not always hold, as a 

 seven ounces has been 

 produced the first year. 

 The Burbank potato was 

 full size the first year it 

 was grown from seed, 

 and many breeders feel 

 that unless the tubers 

 are of edible size the 

 first year they are not 

 likely to be worth fur- 

 ther care. Frequently 

 the tubers_d6~not_ ..reach 

 full size until the second 

 year. 1 The tubers from 

 each plant must be kept 

 separate, the best selected 

 and planted again. The 

 distance apart varies be- a _ stigma , where p,,^ is applied . 



tweeil 26 X 12 and 40 X .* Style, down which the pollen tube 

 i TTT-J 1 goes to the ovary, c, where it fertilizes 



40 inches. Wider plant- the ovllle> which become the seeds (see 



FIG. 51 1'ISTIL OF POTATO 

 FLOWER, SHOWING THE PARTS 



Pig- & rf Attachment of stamens, 

 removed to prevent self-fertilization. 



e _ FetalS) partly torn away to expose 



ovary. /Sectional view of calyx. 



ing permits the Study of 

 *1 ;^j; U, 1 TV, 



the individual. The 



third, fourth, and fifth 



year field culture is given, 



and a variety may be found worthy of a name and 

 further trial before distribution. The breeder's aim is 

 to produce varieties which excel in productivity, 

 powerjo resist diseases, earliness, quality, percentage 



Minn. Bui. 87, p. 



