Lecture 7 — 177 — Potassium Nutrition 



level required by tomato plants grown in water cultures. 



Soil Science 27: 86-109, 1929. 

 LiLLELAND, 0. Experiments in K and P deficiencies with fruit 



trees in the field. Proc. Amer. Soc. Hort. Sci. 29 : 272-276, 



1932. 

 . and Brown, J. G. The potassium nutrition of fruit 



trees, I. Soil Analyses. Proc. Amer. Soc. Hort. Sci. 35: 



327-334, 1937. 



The potassium nutrition of fruit trees, 



II. Leaf Analyses. Proc. Amer. Soc. Hort. Sci. 36: 91-98, 

 1938. 



Nightingale, G. T., Schermerhorn, L. G. and Robbins, W. R. 

 Some effects of potassium deficiency on histological struc- 

 ture and nitrogenous and carbohydrate constituents of 

 plants. N. J. Agr. Exp. Sta. Bull. 499: 1-34, 1930. 



Page, J. B. and Baver, L. D. Ionic size in relation to fixation 

 of cations by colloidal clay. Proc. Soil Science Soc. 4: 150- 

 155, 1939. 



PiRSON, Andre, tjber die Wirkung von Alkali-ionen auf Wachs- 

 tum und Stoffwechsel von Chlorella. Planta, Archiv fiir 

 wissenschaftliche Botanik 29: 231-261, 1939. 



Richards, F. J. Physiological studies in plant nutrition, III. 

 Further studies of the effect of potash deficiency on the rate 

 of respiration in leaves of barley. Annals of Botany 46: 

 367-388, 1932. 



Schachtsschnabel, Paul. Aufnahme von nicht-austauschba- 

 rem Kali durch die Pflanzen. Zeitschrift f. Bodenkunde und 

 Pflanzenernahrung 48: 107-133, 1937. 



Steward, F. C. and Preston, G. The effect of salt concentra- 

 tion upon the metabolism of potato discs and the contrasted 

 effect of potassium and calcium salts which have a common 

 ion. Plant Physiology 16: 85-116, 1941. 



Wall, Monroe E. The role of potassium in plants III. Nitro- 

 gen and carbohydrate metabolism in potassium-deficient 

 plants supplied with either nitrate or ammonium nitrogen. 

 Soil Science 49 : 393-409, 1940. 



