14 

 Table IX. — Osmotic Pressure Determinations. 



Sample 



Section. Treatment. A'. 



3-21 

 403 



3 90 

 1 . 10 



567 

 3 40 

 4.80 

 5 80 

 2.87 

 4-43 



5-34 

 4.78 

 530 

 4-55 



391 

 5 10 



5 40 



3-75 

 4.82 

 4-32 

 4.14 



4.00 

 4.62 

 4.98 

 3.81 

 2.65 

 4.92 



463 

 4.92 



2.92 1. 77 1 21.40 

 5.52 1.338 16. 13 



?an be made between the 

 values for the osmotic pressure determined in successive sets on account 

 of variations due to temperature, physiological scarcity of water, etc., 

 but the values obtained from plants in adjacent sections at the one time 

 are regular enough to be comparable. 



From the values for osmotic pressure of Samples 7, 8, 2 and i of the set 

 of 1 2-9- 1 4 the conclusion was drawn that the osmotic pressure within 

 the plants increased as the quantity of ammonium sulfate applied to the 

 soil was increased. Samples 2, 3 and 4, and 5, 6 and 7 of the set of 1-9-15 

 gave similar results with increasing applications of sodium phosphate 

 and potassium sulfate. The values obtained from the application of 

 sodium phosphate were in every case lower than those obtained from appli- 

 cation of equal quantities of potassium sulfate or ammonium sulfate. The 



