196 



HATCH EXPERIMENT STATION. 



[Jan. 



(plats 1, 2, 3), and others (plats 4, 5, 6) in the form of the 

 highest grade of potassium sulphate (95 per cent.). The 

 subsequent tabular statement shows the quantities of manu- 

 rial substances applied to the different plats : — 



Plats. 



Plat 1, 

 Plat 2, 

 Plat 3, 

 Plat 4, 

 Plat 5, 

 Flat 6, 



Annual Supply of Manurial Substances. 



Sulphate of ammonia, 

 Muriate of potash, 

 Dissolved bone-black. 

 Nitrate of soda, . 

 Muriate of potash, 

 Dissolved bone-black, 

 Dried blood. 

 Muriate of potash. 

 Dissolved bone-black, 

 Sulphate of ammonia. 

 Sulphate of potash, . 

 Dissolved bone-black, 

 Nitrate of soda, . 

 Sulphate of potash, . 

 Dissolved bone-black, 

 Dried blood. 

 Sulphate of potash, . 

 Dissolved bone-black, 



38 

 30 

 40 

 47 

 30 

 40 

 75 

 30 

 40 

 38 

 30 

 40 

 47 

 30 

 40 

 75 

 30 

 40 



This proportion corresponds per acre to : — 



Pounds. 



Phosphoric acid (available), 50.4 



Nitrog-en, 60. U 



Potassium oxide, 120.0 



A computation of the results of a chemical analysis of 

 twenty prominent garden rro])s shows the average relative 

 proportion of the three above-stated ingredients of plant 

 food : — 



Nitrogen, 

 Potassium oxide, 

 Phosphoric acid, 



Per Cent. 

 2.2 



2.0 

 1.0 



One thousand pounds of green garden vegetables contain 

 on the above-stated basis of relative proportion of essential 

 constituents of plant food : — 



Nitrogen, 

 Potassium oxide, 

 Phosjihoric acid, 



4.1 

 3.9 

 1.9 



