"TUBER-UNIT" METHOD OF SEED-POTATO IMPROVEMENT. 29 



The seed-selection plat need not be divorced from the potato field. 

 It can quite as readily be a portion of it, provided it is so located as 

 to make it easily accessible for note taking. 



NOTE BLANKS. 



The note blanks shown in Table 1 are those which have been 

 prepared for use in the Office of Horticultural Investigations and 

 Arlington Farm. Note Blank I is prepared with especial reference 

 to the first season's work. 



Note Blank II is designed for notes to be taken on the selected 

 tuber units hi the second and subsequent season in which they are- 

 studied. The only difference between the two blanks is with respect 

 to the notes on the upper part of the sheet in which provision has 

 been made in Note Blank II for recording the previous year's 

 data relative to the time and place of selection of the tuber unit, 

 together with yield of tubers secured. With such data recorded, 

 the observer can very readily compare the behavior of the selection 

 in any given season with that of the preceding one. Each note b'ank 

 has provision for notes on 10 tuber units. 



SUMMARY. 



(1) Good seed is of vital importance in the production of a maxi- 

 mum crop of potatoes. 



(2) Good seed may be obtained by the tuber-unit method through 

 the elimination of unproductive and weak plants. 



(3) Like produces like. Plant tubers from unproductive or weak 

 plants and you will reap a similar harvest. 



[Cir. 113] 



