52 
BULLETIN 1377, U. S. DEPARTMENT OF AGRICULTURE 
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Fig. 8.— Chart showing the effects of soil reaction on the efficiency of rotation and the use of fer- 
tilizers, as indicated by the yields of corn at Wooster, Ohio. The plot numbers are given beldw 
the bars. L indicates the plots receiving lime. The unhachured space in each of the last two 
bars of the chemical-fertilizer series indicates how much greater the additive effects of conjoining 
rotation and the use of fertilizer are than the sum of the effects resulting when the two practices 
are acting independently of each other; or it may indicate to what extent the values of R and F 
overlap. The unhachured space in each of the last two bars in the manure series indicates to 
what extent the conjoint effects of rotation and the use of manure fall short of being fully additive. 
{Compare with Tables 49 and 50.) 
