A STUDY OF FACTORS INFLUENCING THE YIELD OF POTATOES 1205 



a bushel of seed less and a dollar's worth less of fertilizer per acre, the 

 varieties of the Green Mountain group yielded approximately 26 and 19 

 bushels per acre more, respectively, than did the Rural varieties; Under 

 the cool climatic and the good soil conditions of this region, therefore, 

 the Green Mountain type of potato is the more profitable. 



Summary of varieties in all regions 



A comparison of the principal potato groups produced in all four regions 

 during the years for which survey data were obtained, is shown in table 

 42. It should be understood that no specific recommendations for a given 

 region can be made on the basis of the comparisons drawn in this table. 

 Certain facts of interest, however, are evident. On the average, the 

 Green Mountain type is grown under more favorable climatic and soil 

 conditions than the other types, with more seed and more manure and 

 fertilizer per acre. Therefore, for the State as a whole, the Green Mountain 

 varieties have yielded more than have those of the Rural type. The table 

 shows that in the blight epiphytotic of 1912 in Steuben County, the rotting 

 of the white-sprout varieties in the field exceeded that of the blue- sprout 

 varieties by about 24 bushels per acre. For practically the same reasons 

 the Cobbler .type has outyielded the Rose as an early potato. The Early 

 Ohio owes its high average yield in 1912 to the large amount of seed and 

 fertilizer used. 



SOURCE OF SEED 



In the mind of the average grower, the source of his potato seed is of 

 small concern unless of necessity he is compelled to periodically change 

 his seed stock by obtaining it outside his home county. The only section 

 in New York where this is the case is Long Island. In table 43 are shown 

 the sources from which the seed supply was obtained for each of the surveyed 

 regions in 1912 and 1913. 



TABLE 43. SOURCE OF SEED IN THE FOUR REGIONS SURVEYED, IN 1912 AND 1913 



