286 



Bulletin 232. 



on eight plats receiving no fertilizer was at the rate of 2,160 pound>^ 

 per acre ; on three plats receiving only mineral fertilizers 2,890 pounds ; 

 on eight plats receiving nitrogen as nitrate of soda 4,676 pounds; 

 and on two plats receiving nitrogen in stable manure 4,805 pounds. 

 An apparent increase in yield of 10.3 bushels of oats and 4,137 

 pounds of timothy hay was obtained from two applications of 320 

 pounds of nitrate of soda, 320 pounds of acid phosphate and 80 

 pounds of muriate of potash. 



T^^br-^" ■ 



723 

 No treatment. 

 3200 lbs. hay per a. 



722 

 160 lbs. Nitrate Soda. 

 80 lbs. Muriate Potash. 

 640 lbs. Acid Phosphate. 

 4350 lbs. hay per a. 



721 

 160 lbs. Nitrate Soda. 



80 lbs. Muriate Potash. 

 320 lbs. Acid Phosphate. 

 4590 lbs. hay per a. 



Fig. 20. — Both the yield produced as well as the cost of applying will be affected by the 

 proportion of the ingredients of a fertilizer mixture. Observe the data for Plats 721, 722, 

 and 725 on the influence of proportion of Nitrate of Soda and Acid Phosphate. 



4. A single application of ten tons of stable manure produced an 

 apparent increase of 5.3 bushels of oats and 2,595 pounds of hay; 

 twenty tons produced an apparent increase of 11.2 bushels of oati 

 and 4,025 pounds of hay per acre. Where stable manure was ap- 

 plied a material proportion of the hay consisted of red and alsike 

 clover due to seed in the manure. 



5. If stable manure can be applied at fifty cents per ton, the net 

 gain from the use of ten tons was S10.55, and from twenty tons $15.14. 



