1895.] PUBLIC DOCUMENT — No. 33. 259 



The phosphatic ylag, Mona guano, South Carolina phos- 

 phate and Florida phosphate were applied at the rate of 850 

 pounds per acre ; dissolved bone-l)lack at the rate of 500 

 pounds per acre. Nitrate of soda was applied at the rate of 

 250 pounds per acre and potash-magnesia sulphate at the 

 rate of 300 pounds per acre. 



Potatoes w^ere raised upon the plats in 1890 ; in 1891 win- 

 ter wheat was employed (for details see ninth annual report) ; 

 in 1892 serradella was the crop experimented with (see tenth 

 annual report) ; and in 1893 a variety of Dent corn, Pride 

 of the Noi-th (see eleventh annual report). 



1894. — During the preceding season it was decided to 

 ascertain the after-effect of the phosphoric acid ai)plied 

 during previous years by excluding it from the fertilizer 

 applied. In addition, to secure the full effect of the phos- 

 phoric acid stored up, the potassium oxide and nitrogen 

 were increased one-half, as compared with preceding seasons. 

 A grain crop (barley) calling for a liberal amount of phos- 

 phoric acid was chosen for the trial. The field was ploughed 

 April 17, the fertilizer being applied broadcast April 2"', 

 and harrowed in. Below is given a statement of fertilizer 

 applied : — 



Plat 1 (6,494 square feet) ( 64J pounds of nitrate of soda. 



^ ( 8( pounds of potash-magaesia sulphate. 



Plat 2 (6,565 square feet), j 65^ pounds of nitrate of soda. 



^ (88 pounds of potash-maguesia sulphate. 



Plat 3 (6,636 square feet) < 66 pounds of nitrate of soda. 



(89 pounds or potash-maguesia sulphate. 



Plat 4 (6,707 square feet) J 663 pounds of nitrate of soda 



^ ' ^ (90 pounds of potash-magnt-Bia sulphate. 



Plat 5 (6,778 square feet) j 6;| P0""d8 of nitrate of soda. 



' ( 90J pounds or potash-magnesia sulphate. 



May 2 the barley was sown in drills two feet apart, at the 

 rate of two bushels i)er acre. May 8 the barley was coming 

 up on the plat. The field was kept free from weeds by cul- 

 tivation. 



Height of Plants. 

 [Inches.] 



Plat 1. 



Plat 2. 



Plat 3. 



Plat 4. 



Plat 5. 



June 12 14 I 13 10 | 14 



June 18 I 18 1 15 12 I 16 



June 26 28 26 21 I 24 



14 

 16 

 27 



