156 Bulletin 130. 



In addition to the cultivation which was given these plats they 

 were sprayed four times, once with Bordeaux mixture* alone and 

 three times with a Bordeaux and Paris Green mixture. 



In addition to the series of plats, a measured acre was selected 

 which had been in timothy and clover the previous year. The 

 soil was a clay loam and during the winter of 1895-6 was given a 

 light top-dressing of barn manure. In the spring the coarse 

 material was raked off with a horse rake, and the land was fitted 

 and planted to Rural New Yorker No. 2 potatoes. This acre 

 received six cultivations and gave a yield of 314 bushels. 



AVERAGE YIELD PER ACRE FOR 1 895. 



Plats receiving 13 cultivations, 



9 " .... 



AVERAGE YIELD PER ACRE FOR 1 896. 

 Plats receiving II cultivations, 



The one-acre field, 6 cultivations. 



Fertilized plats receiving 7 cultivations, 

 Average yield per acre for New York state 



(United States Census), 1890, . . . 68.8 

 Average yield per acre for New York 



state, 1895, 122. " 



Average yield per acre for all plats and the 



one acre at Cornell University for 1895 



and 1896 333-34 " 



From these results we are led to conclude that in potato raising 

 the matter of tillage is too often neglected. The results ob- 

 tained two years in succession without any application of fertil- 

 izer show that the average yield of New York state is far below 

 what it need be. The soil on which these experiments were con- 

 ducted was not more rich in plant-food than the ordinary soils. 

 The average analyses of forty-nine soils shows the following 

 amount of potential plant-food to be contained in an acre to the 

 depth of eight inches :t 



* The Bordeaux mixture was made as follows : Copper sulphate 6 pounds, 

 quick lime 4 pounds, water 45 gallons. 



t For more extended soil analyses see Roberts' " TheFertility of the Land." 



