The Bulletin. 7 



ajul 03 pounds respectively of phosphoric acid per acre. These 

 amounts of phosphoric acid would be supplied by 75, 150, 300, and 

 450 pounds respectively of 14 per cent acid phosphate. The results 

 show the hirgest yields, increases and profits to have come from the 

 apph'cation of 150 pounds of 14 per cent acid phosphate, or 21 

 pounds of ])hos])horic acid per acre. Larger quantities of phosphoric 

 acid gave profitable yields, but the profits were not as large as with 

 the abo\e amount when the quantities of nitrogen and potash were 

 not changed. 



8. Varying the amounts of the normal fertilizer application from 

 150 to 000 i^ounds per acre gave increased yields and profits for all 

 the applications, the most profitable returns resulting from 450 

 pounds of fertilizer per acre. After paying for the fertilizer itself 

 the following profits were obtained from different quantities of 

 fertilizer : 



150 pounds of fertilizer per acre gave a profit for corn and 



stover of $0.74 ; 

 300 pounds of fertilizer per acre gave a profit for com 



and stover of $14.29; 

 450 pounds of fertilizer per acre gave a profit for corn and 



stover of $17.82; 

 000 pounds of fertilizer per acre gave a profit for corn and 



stover of $12.83. 



9. In comparisons of dried blood and nitrate of soda as sources of 

 nitrogen, the total yields and increased yields over unfertilized plats 

 were quite uniform and do not show any decided advantage of either 

 nitrogen furnishing material over the other, or any one of the meth- 

 ods of application over the others, though the average results gave a 

 slightly larger profit with nitrate of soda as the source of nitrogen, 

 when two applications were made, one-half at time of planting, and 

 the other half about July first. Taking into consideration the addi- 

 tional cost of making the second application of nitrogen the best re- 

 turns for corn was from the application of all the fertilizer in the 

 drill before planting. 



10. When 300 pounds of fertilizer were applied each in the drill, 

 broadcast before planting, and divided into two equal parts, one-half 

 being applied in the drill before planting and the other half as a 

 side dressing about July 1, the broadcast application yielded 22 per 

 cent less in production and profit than did the other two methods of 

 application; the other two methods of application were practically 

 equal in increased yields and profits. 



11. Taking the conclusions under 9 and 10 together, it is seen that 

 where 300 pounds of fertilizer is used to the acre on this character 



