134 



HATCH EXPERIMENT STATION. 



[Jan. 



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. 



Annual Supply of Manurlal Substances. 



Pounds. 



Plat 1, 

 Plat 2, 

 Plat 3, 

 Plat 4, 

 Plat 5, 

 Plat 6, 



Sulphate of ammonia, 

 Muriate of potash, 

 Dissolved bone-b!acli, 

 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 



Nitrogen, 60.0 



Potassium oxide, 120.0 



A computation of the results of a chemical analysis of 

 twenty prominent garden crops shows the following average 

 relative proportion of the three above-stated ingredients of 

 plant food : — 



Per Cent. 



Nitrogen, 2.2 



Potassium oxide, 2.0 



Phosphoric acid, . . . . 1.0 



One thousand pounds of green garden vegetables contain, 

 on the above-stated basis of relative proportion of essential 

 constituents of plant food : — 



Pounds. 



Nitrogen, 4.1 



Potassium oxide, . 3.9 



Phosphoric acid, 1.9 



The weights and particular stage of growth of the vege- 

 tables when harvested control, under otherwise corresponding 

 conditions, the actual consumption of each of these articles 

 of plant food. Our information regarding these points is 

 still too fragmentary to enable a more detailed statement 



