No. 4.] 



MAXURIAL PROBLEMS. 



107 



From the foregoing table it will be seen tluit the total 

 yields of tubers in the case of plots 20, 18 and 24 were but 

 109.17, 173.92 and 121 bushels, respectively. It will be 

 noted also that the relative amount of small or unmerchant- 

 able tubers was very great, — a fact which has been observed 

 in many of the former experiments at the Rhode Island 

 station upon acid, un limed soil. A very marked contrast 

 is atlorded by Plot 'I'l in the first course, which was limed 

 immediately before the potatoes were planted, which pro- 

 duced a total of 267.17 bushels per acre, 215.5 bushels of 

 which were of merchantable size. It will be observed that 

 l)lots 20 and 18 produced a total of 2(57.84 and 300.5 

 bushels respectively in the second course, as compared Avith 

 109.17 and 173.92 bushels in the first course of the rotation ; 

 and in the second course, after the plots had been limed and 

 improved in tilth and fertility, the percentage of tubers of 

 merchantable size increased remarkably. 



The folloAving tables give the Aveights of winter vja and 

 straw obtained in the first course and in the first two years 

 of the second course of the rotation, in yields per acre : — 



First Course of Rotation. 



PLOT. 



Year. 



Straw 

 (Tons). 



Grain 

 (Bushels). 



Plot 20, 

 Plot 18, 

 Plot 22, 

 Plot 24, 



29.46 



28.13 

 29.20 



Second Course of Rotation. 



Plot 20, 

 Plot 18, 

 Plot 22, 

 Plot 24, 



16.25 

 24.46 



