116 



POTATOES AND POTATO CULTURE 



large or commercial potatoes. From the standpoint of value 

 there is comparatively little difference shown. 



Experiment Y. 



Comparative results froin growing potatoes luitJi and with- 

 out barnyard manure, other conditions being the same. 



The soil selected for this experiment well represented the 

 average cultivated field of New England. It had been stocked 

 down to grass for about five years and needed taking up and 

 handling. The grass crop the previous year was light and 

 about paid for harvesting. The field was plowed up and well 

 fitted. The x)lanting Avas done on May 21st and crop harvested 

 October 16th. The soil was of a medium clay loam. 



The following table gives the comparative results: 



PLOT. 



How Fertilized. 



Barnyard Manure. 



Commercial Fer- 

 tilizer. 



Yield per Acre — Bushels. 



Large. Small. Total. 



1 

 2 

 3 

 4 

 5 

 6 

 7 

 8 



None 



15 cords 



None 



15 cords 



None 



15 cords 

 None.. .. 

 15 cords 



None 



None 



750 pounds 



750 

 1,500 



1,500 " 

 2,000 '• 

 2,000 



191 

 306 

 290 

 391 

 315 

 423 

 240 

 289 



It is evident from the above that in each instance where barn- 

 yard manure was used there was an increase in yield of pota- 

 toes. 



Where barnyard manure alone was used the increase was 127 

 bushels of marketable potatoes, or 115 bushels in all. 



Where barnyard manure plus 750 pounds of commercial fer- 

 tilizer was used as compared with a plot containing 750 pounds 

 of commercial fertilizer withou barnyard manure, the increase 

 was 107 bushels of marketable potatoes, or 101 bushels total, 

 large and small. 



Where the conditions were the same excepting the manure 

 was absent in one plot and 1,500 pounds of commercial fertilizer 



