MICHIGAN EXPERIMENT STATION BULLETINS. 

 Tablk III. — Yield from different aviounis of seed, one foot apart. 



127 



Whole potatoes, 10 lbs 



Halves of potatoes, 5 lbs 



Quarters of potatoes, 2'/4 lbs... 

 Eighths of potatoes, 1J4 lbs... 

 Single eyes, 10 oz 



Clark's No. 1. 



o 

 t> 



lOO 

 98 

 96 

 94 

 92 





8-17 b 

 8-15 b 

 S-15b 



8-17 

 8-15 b 



«T3 

 w 



o a 



459 



2S8 



120 



83 



33 





233.5 



186.4 



126.5 



94.8 



64.9 



u 

 as 



129.8 



lOi.8 



79.7 



73.2, 



50.1, 



a 



03 



103.7 

 81.6 

 46.8 

 2l.6i 

 14.8i 



Beaaty of Hebron. 



o 



100 



98 

 96 

 94 1 

 921 



CD 



8-22b 

 8-15b 

 8-15 b 

 8-19 

 8-15 



(X) 0) 



d a 



461 

 254 



128 

 68 

 33 





244.7 



159.8 



76.5 



63.2 



61.5 



(D 



JO 

 u 



179.8 



103.7 



39.8 



41.6 



46.8 



■a 



CO 



64.9 

 56.1 

 36.7 

 21.6 

 14.7 



Market average for three years 



Average amount of seed 



Net gain per acre _ 



Single eyes. 



99.8 



4.3 



95.5 



The total yield in bushels per acre will be seen to be /bwr times as much 

 from whole tubers as from single eyes, with a gradual but regular decrease 

 of yield as the size of the seed decreased. There was less difference in 

 yield of marketable tubers, but the average yield was more than three 

 times as great. As is usually the case, also, the yield of small tubers was 

 in proportion to the size of the seed pieces used. 



The average yield for three years gives about the same results, except 

 that the past season, for the reason given, was unusually favorable for 

 whole tubers. 



We lind that although for the three years the average yield of the large 

 seed (whole) potatoes was greater than any of the smaller ones, that the 

 greatly increased amount of seed more than equaled the increased yield, 

 and hence it was less profitable than the use of halves. When planted 

 one foot apart the average result for three years would show that from 25 

 to 28 bushels per acre gave best results. For two or three feet between 

 the hills of course a smaller amount of seed would seem desirable, and for 

 that reason another experiment was arranged to ascertain the proper dis- 

 tance apart in rows for different-size pieces. 



DISTANCE TO PLANT POTATOES. 



The distances selected were for eyes. 1, 1^, 1-|, 1|, 2, and 2^ feet; for 

 halves and quarters 1, 1^, 2, and 2|- feet, and for whole ijotatoes 1, 2, and 3 

 feet. The results obtained are shown in Table IV. 



