142 



HATCH EXPEKIMENT STATION. 



[Jan. 



5. Field Experiments to study the Effect of Phos- 

 phatic Slag and Nitrate of Soda, as compared 

 with Ground Bone, on the Yield of Oats and 

 Corn. 



The field used for this experiment is situated along a 

 gently sloping ground, in the south-east corner of the farm. 

 The soil consists of a sandy loam, and has been for several 

 years under a careful system of cultivation and manuring. 

 The productiveness was considered of uniform character 

 when the experiment was planned in 1893. The area en- 

 gaged in the observation was divided into two plats running 

 along the slope from north to south. One plat, situated 

 along the east side of the field, measured one acre (Plat 1) ; 

 Plat 2 was situated along the west side of the field and 

 measured one and nine-tenth acres. 



Plat 1 was fertilized with 600 pounds of fine-ground bone 

 and 200 pounds of muriate of potash per acre ; Plat 2 was 

 fertilized with 800 pounds of fine-ground phosphatic slag 

 (odorless phosphate), 200 pounds of muriate of potash and 

 200 pounds of nitrate of soda per acre. 



The amounts of manurial ingredients used per acre cor- 

 respond to (in pounds) : — 



Plat 2 



(Phosphatic 



Slag). 



Potassium oxide, 

 Phosphoric acid, 

 Nitrogen, 



104 



166 



31 



Composition of Fertilizer applied {Per Cent.). 



Ground bone, 

 Phosphatic slag, 

 Muriate of potash, 

 Nitrate of soda, . 



Nitrogen. 



4.09 

 15.70 



Phosphoric 

 Acid. 



21.86 

 20.84 



Fotassium 

 Oxide. 



52.20 



