194 BULLETJN 273. 



forage, ear corn and stover was obtained when all three fertilizers were 

 added. (The previous year the same combination gave the highest 

 yield of timothy.) 



The residual effect of barnyard manure was greater than that of any 

 combination of artificial fertilizers. Ten tons per acre show an increase 

 of 110% in ear corn and 20 tons per acre an increase as high as 

 ]I5%. The increase in stover and forage, though not quite so high as 

 in ear corn, was much greater than that of any combination of mineral 

 fertilizers. 



The increase in yield of hay in 1905—06-07 was in every case worth 

 more than the cost of fertilizers applied, so that the increase in yield 

 of corn was clear gain. 



Figuring on the current market prices for the fertilizers, and 50 cents 

 per ton for farm manures, the use of 20 tons of farm manure applied 

 twice to timothy but not used for corn, gave a gain of $108 per acre 

 in four year. Ten tons of manure gave a gain of ^/2 per acre, and 

 the most profitable combination of fertilizer constituents produced a 

 gain of $60.85. 



