1176 



EARLE V. HARDENBURG 



TABLE 19. 



RELATION OF DEPTH OP PLOWING TO YIELD ON 261 MONROE COUNTY FARMS 

 IN 1913 



apparent relation between depth of plowing and yield. With approxi- 

 mately the same fertilization for each depth of plowing, the slight tend- 

 ency for increased yields at the deeper plowing may easily be attributed to 

 the larger amount of seed planted. 



The coefficient of correlation shown in figure 134 is 0.006 0.039. Both 



Yield per acre, in bushels 



1 



2 



52 



100 



106 



33 



5 



299 



1 7 38 7(X 50 60 34 24 8 4 1 1 

 r = 0.006 d= 0.039 ' 



FlG. 134. CORRELATION OF DEPTH OF PLOWING AND YIELD ON 299 MONROE COUNTY FARMS 



IN 1913 



the coefficient and its probable error indicate alack of relationship between 

 depth of plowing and yield for this region. Apparently the minimum 

 depth of plowing was sufficient for maximum production in Monroe 

 County soils. 



Depth of plowing in Franklin and Clinton Counties 



The figures shown in table 20 indicate that depth of plowing does not 

 influence yields in Franklin and Clinton Counties. Tho the amount of seed 



