A THIRTY-YEAR FERTILIZER TEST. 



131 



? Manure 



U N^P^K 



11 P^K 



5 Lime 



Average Of Checks, 



Pounds Of StoVer 

 to a Bushel Of Com 



84.4 

 230.8 



81.9 

 1670 



FiG.Jl. — South Soil Test. Total yields per acre. Ten corn crops. 



