A STUDY OF FACTORS INFLUENCING THE YIELD OF POTATOES 1183 



extent, in Franklin and Clinton Counties, altho here much manure is 

 applied to new seeding and some is applied to oats. 



It is evident from table 23 that the region in which .only a small propor- 

 tion of the growers use fertilizer on potatoes is also the region in which the 

 least fertilizer is applied to an acre. The average application of manure 

 per acre in each region shown in the table, is reckoned not on the basis of 

 those acres alone which received manure, but on the basis of the total 

 potato acreage of those farms where manure was applied. Thus, on Long 

 Island, manure is applied to only a small proportion of the total potato 

 acreage per farm, while in the other regions most of the acreage is covered. 

 The amount per acre averages nearly 10 tons, tho the rate varies from 

 10 to 20 tons. 



The extent to which fertilizer and manure are used in Monroe County 

 and in Franklin and Clinton Counties is fairly similar. The least fertilizer 

 is used in Steuben County. Whether more could be used profitably in any 

 of these regions is discussed in the subsequent studies. 



Value of manure and fertilizer on Long Island 



Inasmuch as the amount of seed used has been found to be a very 

 influential factor in determining yield, this factor is eliminated as far as 

 possible in the studies of other factors. Therefore, in studying the influence 

 of the value of manure and fertilizer on yield, the records were first sorted 

 into groups, according to the value of manure and fertilizer, and were then 

 resorted according to the amount of seed used, as shown in table 24: 



TABLE 24. 



RELATION OF VALUE OF MANURE AND FERTILIZER TO YIELD ON 330 LONG 

 ISLAND FARMS IN 1912 



