7° 



PHYSIOLOGY OF NUTRITION 



Pj(; 44 —Growth of oats with various fertilizers. O, without.addition to the soil; KP, 

 with addition of potassium and phosphoric acid; KPN, with addition of potassium, phosphonc 

 acid and potassium nitrate. (^After P. Wagner.) Compare- with Pig. 45- 



Fig. 45. — Growth of peas with various fertilizers. 0, without addition to the soil; KP, 

 with addition of potassium and phosphoric acid; KPN, with addition of potassium, phos- 

 phoric acid and potassium nitrate. (After P. Wagner.) Compare with Fig. 44. 



