HOW PLANTS OBTAIN THEIR LIQUID FOOD. 43 



Fig. 27. 

 2% solution potassium 

 nitrate. 



Fig. 28. 



io# solution potassium 



nitrate. 



Fig. 29. 

 ■zq'/c solution potassium 

 nitrate. 



Figures 27-29. — Pumpkin seedlings, soil watered with solution of potassium nitrate of 

 [ifferent strengths. Photographed immediately after the application of the solution to 

 he soil. 



Fig. 30. 

 2% solution potassium 



Fig- 3i- 

 10% solution potassium 



Fig. 32. 

 20% solution potassium 

 nitrate. nitrate. nitrate. 



Figures 30-32. — Pumpkin seedlings, soil watered with solution of potassium nitrate 

 of different strengths. Photographed four hours after application of the solution to 

 the soil. 



