USE OF PHOSPHORUS IN DIFFERENT FORMS 259 



The data thus far reported concern only the clover and oats for 

 1908, and they almost certainly show more marked differences than 

 will appear from long-continued and more general experiments : 



OHIO EXPERIMENTS WITH LIME AND RAW PHOSPHATE 



(a) Average of 14 Otherwise Unfertilized Plots 



(b) Average of 26 Otherwise Fertilized Plots 



Even if we assume that the lime produced no increase, the effect 

 of the raw phosphate is very marked. On the " otherwise unfer- 

 tilized " land one ton of raw phosphate per acre produced 1.41 

 tons more clover and 15.1 bushels more oats, the value of which, 

 at $6 per ton and 30 cents a bushel, respectively, would amount 

 to $12.99, or enough to pay for two tons of ra\v phosphate at $3.50 

 per ton where the freight rate does not exceed $3 (as in southern 

 Illinois). 



The two-ton application produced markedly greater effect on the 

 oats, but not on the clover. These results include two entirely 

 separate series of plots, and each reported yield is the average from 

 a large number of plots. The data must not be considered as ex- 

 ceedingly trustworthy, but we must agree with Director Thome's 

 statement that " it looks as though we were getting something 

 worth while there." Knowing that the effect of lime where needed 



