72 



Two other tables give tlie yield of merchautable and umiiercliantablo 

 I)otatoes iu each row, aud the average yield per hill for the different 

 lots. The highest yield of merchantable potatoes from 100 tubers was 

 G23 potatoes weighing 102f pounds from tubers averaging 8 to 10 ounces ; 

 the lowest was 3G3 potatoes weighing G2 pounds from tubers averaging 

 1 to 2 ounces. The highest average yield per hill of merchantable pota- 

 toes was from seed which weighed from 8 to 14 ounces per tuber. 

 From seed tubers weighing 1 to 2 ounces the average yield was only 3.6 

 merchantable tubers weighing 10 ounces. In general the i^roductiveness 

 per hill was greater with the largest tubers aud decreased quite con- 

 stantly with a decrease of weight in the seed. The relation of the size 

 of the seed tuber to the amount of the crop is illustrated by a diagram. 

 Calculations are reported which show that while 81 bushels of 10 to 12- 

 ounce tubers would be required to plant an acre, at the rate employed 

 iu this experiment only 11 bushels of 1 to 2-ounce tubers would be re- 

 quired for the same area. 



The table herewith gives calculated results per a(;re, merchantable 

 and unmerchantable potatoes being classed together in the total yield. 



Eatimated yields, cost of seed, value of crop, and balanve iii, favor of crop per acre. 



Weight of seed and 



distance planted 



iipait. 



Value of 



crop per I IJalanco 

 acre at 40 in favorof 

 cents per j crop, 

 bushel. 



$58. 40 

 88. 00 

 78.00 

 67. 20 

 63. 20 

 58.40 

 56.40 

 51.20 



$10. 40 

 17. 25 

 28. 50 

 28.20 

 35.45 

 38.90 

 42.90 

 42.95 



It appears that in this experiment, with one slight excei)tiou, the 

 larger the tuber planted the smaller the profit, aud vice versa. 



2. Comparison of lar(je and medium sized ichole tubers., halves, quarters, 

 and single eyes. — Potatoes were planted on six plats, each one fourth acre. 

 The results are stated in two tables, which give data for the season of 

 growth and the yield and value of crop for each amount of seed used. 

 The largest yield and next to the largest profit were with whole potatoes. 

 The largest profit was with quarters. " Large whole tubers produced 

 a larger crop and greater value over cost of seed than did the medium 

 sized tubers. Single eyes from large tubers gave a larger aud more 

 valuable crop than single eyes from medium sized tubers." 



3. Comparison of tchole tubers with halves from wholes of the same 

 wfiijht. — "This experiment had two objects : (a) To note the difference in 

 yield between a certain number of tubers of the same size, planted 

 >Yhole, aud twice that number of halves from potatoes of the same size 



