A STUDY OF FACTORS INFLUENCING THE YIELD OF POTATOES 1185 



TABLE 25. 



RELATION OF VALUE OF MANURE AND FERTILIZER TO YIELD ON 155 FARMS 

 IN STEUBEN COUNTY IN 1912 



Yield per acre, in bushels 



8 K 8 8 



i - 7 ~ 1 ^ 



CO i I CO -H CO i-H 



$ 0-$ 1 



$ 1-$ 5 



$ 6-S10 



| $11-115 



$16-$20 



a $21-$25 



g $26-430 



^ $31-$35 



* $36-$40 



$41-$45 



$46-$50 



1 3 24 61 70 72 52 38 9 10 2 00 1 343 

 r = 0.289 0.033 



FlG. 137. CORRELATION OF VALUE OF MANURE AND FERTILIZER, AND YIELD, ON 343 STEUBEN 



COUNTY FARMS IN 1912 



Value of manure and fertilizer in Monroe County 



The influence of manure and fertilizer in Monroe County is marked, and, 

 except in a few cases where too few records were available, the results are 

 consistent under constant amounts of seed used. It is evident from table 

 26 that not enough manure and fertilizer was used in this region so that the 



