HOW PLANTS OBTAIN THEIR LIQUID FOOD. 43 



Fig. 27. Fig. 28. Fig. 29. 



2% solution potassium 10/6 solution potassium 20$ solution potassium 



nitrate. nitrate. nitrate. 



Figures 27-20. Pumpkin seedlings, soil watered with solution of potassium nitrate of 

 different strengths. Photographed immediately after the application of the solution to 



tVi*i cri1 



Fig. 30. Fig. 31. Fig. 32. 



2% solution potassium io# solution potassium -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. 



