1262 



EARLE V. HARDENBURG 



TABLE 88. 



RELATION OF SPRAYING PRACTICE TO YIELD ON 282 MONROE COUNTY FARMS 

 IN 1913 



growing season, thereby increasing yield. The latter function naturally 

 is asserted late in the growing season. In 1913, Monroe County ex- 

 perienced one of the earliest killing fall frosts in its history. As a result, 

 not only the bean crop, but the potato crop as well, was cut down, causing 

 serious loss to the grower. Only about 7 per cent of the potato growers 

 reported the occurrence of late blight up to the time of this frost. It is 

 therefore evident that the possible advantages from fungicidal spraying this 

 year were almost entirely nullified. Under these conditions, frequency of 

 spraying could not -be expected to show a normal influence on yield. The 

 correlation coefficient (fig. 150) is 0.084 0.081. This shows insignificant 

 correlation in respect to both the coefficient and its probable error. 



Yield per acre, in bushels 



8 8 8 S I 



^ ci ri< Ci JH 



S S S 8 





i 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



11 







16 



19 



14 



11 



4 



2 



1 



















1 



68 



18 7 17 11 3 

 r = 0.084 0.081 



FlG. 150. CORRELATION OF FREQUENCY OF BORDEAUX SPRAYING, AND YIELD, ON 68 MONROE 



COUNTY FARMS IN 1913 



