growing crops ^ or where an application of Nitrogen is desirable ^^^'^ '°'" 



in the maturing of a crop^ the Nitrate of Soda is preferable to ^"^^ 



dried blood. " ^ 



The results obtained from the several ^ 



, ... Summary, 



experiments enumerated seem to mvite the 



following conclusions: 



I, That in order to study the action of the three essen- 

 tial elements of plant food, Nitrogen, phosphorus and 

 potassium, a soil must be used that is fairly deficient in 

 plant food, 



1. That potash when used in any considerable amount, 

 either alone or in connection with Nitrate of Soda, pro- 

 duced conditions unsuitable to plant growth. 



3. When phosphoric acid was used alone or in con- 

 nection with Nitrate of Soda or muriate of potash, even in 

 large amounts, a marked increase in the growth of the 

 plants was obtained. 



4. The muriate of potash proved somewhat superior to 

 the sulphate, the increase in each case being but slight. 



5. But little difference seems to obtain in the efficiency 

 of different forms of available phosphoric acid. 



6. In each instance chemical fertilizers proved slightly 

 superior to stable manures. 



7. The application of liquid fertilizers from below by 

 the sub-watering method proved perfectly feasible and gave 

 satisfactory results. 



8. Nitrate of Soda gave quicker returns than did dried 

 bloody and seems best adapted to lettuce culture. 



9. The sub-watered plants made a better growth than 

 the surface watered ones. 



