44 



The Bulletin 



The experiments in Table 6 were planned with a view of throwing 

 as much light as possible on these questions of nitrogen fertilization in 

 corn growing. In the tests all of the phosphoric acid and potash were 

 applied in the drill before planting. 



On three plats 15^, ll^, and 9^ one-half the nitrogen was supplied as 

 dried blood and was applied with the phosphoric acid and potash before 

 planting, the other half of the nitrogen being supplied as nitrate of soda 

 and was applied about July 1. On three other plats 1^, 12^ and 10^^ 

 all of the nitrogen was supplied by nitrate of soda, one-half being ap- 

 plied before planting with phosphoric acid and potash, and the other 

 half about July 1. On still three other plats 2-^, 132, ^^^(j i;i^2^ j^j^g 

 nitrogen was supplied by dried blood, one-half being applied before 

 planting, with the phosphoric acid and potash, and the other half 

 about July 1. On three more plats 3^, 1^ and 12^^ four-fifths of the 

 nitrogen was furnished by dried blood and one-fifth by nitrate of soda, 



TABLE VII— RESULTS OF FERTILIZER EXPERIMENTS WITH CORN; SHOWING 



Results IN "Old Field" 



Number 



of 



Plat 



Fertilizer Application Per Acre 



82 



12 



Unfertilized.. 0= 



( 69.2 Pounds 13% Blood N= 



150 Pounds 14% Acid Phosphate.. P= 



[ 22.5 Pounds 20% Manure Salt K= 



Fertilizer applied in drill before planting . 



Unfertilized.. ..0= 



f 69.2 Pounds 13% Blood. N= 



150 Pounds 14% Acid Phosphate. P= 



[ 22.5 Pounds 20% Manure Salt. K= 



The fertilizer on this plat was divided into two equal 



parts, J^ being applied in the driU before planting, 



and ^2 as side dressing about July 1. 



[ 69.2 Pounds 13% Blood N= 



150 Pounds 14% Acid Phosphate P= 



[ 22.5 Pounds 20% Manure Salt K= 



The fertilizer on this plat was applied broadcast be- 

 fore planting. 





oPh 



T! 'OT3 



as: So 



^ Oh 



O 



M 



.£1 

 m 

 <S 



■^^ 

 o 



«- ID 



o ■ 



Yield in Bushels of 

 Shelled Corn Per Acre 



a, 



21 



1903 1 1904 



22.9 29.9 



4. 5 J 



28.6 



36.4 



Ave. 



26.4 

 32.5 



6' 

 9» 



21 



4.5 



21.3 

 15.2 



25.6 



27.7 



23.5 

 21.5 



8' 



21 



19.9 



32.0 



4.5 



26. 



