CIRCULAR 



Concerning Co-OperatJve Experiments in 



Potato Culture, 



No 18. 



Cornell University Revised Edition. 



Agricultural Experiment Station, 

 I. P. ROBERTS, Director. 



Ithaca*, N. Y., April, 1900. 



Such marked results in potato growing have been secured during 

 recent years on tiie Cornell Experiment Station grounds, that it has 

 been thought desirable to test the methods employed here to ascer- 

 tain whether thej will give similar results on other soils and in 

 other hands. It is hoped also by having the tests made by the 

 farmers on their own farms, to attract the attention of potato grow- 

 ers to improved methods as it has not been possible to do by the 

 work done at the Station. 



The land used for these experiments at the Station is a gravelly 

 soil which analysis has shown is carrying little more than half the 

 potential plant food found in average soils. (See Bulletin 130, p. 

 157.) It lias not been manured or fertilized since the autumn of 

 1893 (see the same, p. 157) and has produced heavy crops of grain, 

 forage or roots each season till planted to potatoes. (See Bulletin 

 135, pp. 277, 287.) 



In 1895 eight plats averaged at the rate of 352.6 bushels per acre, 

 ranging from 301 to 415 bushels, according to treatment. This 

 season was especially favorable for potatoes and the average for the 

 State was extra high, being 122 bushels per acre. (See Bulletin 

 140, p. 389.) 



In 1896 nine plats averaged at the rate of 352.6 bushels per acre, 



191 



