Lecture 7 



ASPECTS OF THE POTASSIUM NUTRITION OF 

 PLANTS AS ILLUSTRATING PROBLEMS OF 

 THE SYSTEM, SOIL-PLANT-ATMOSPHERE (in- 

 troductory statement) :- Reactions of potassium 

 IN THE SOIL — The capacity of the soil to supply 

 potassium to plants — a physiological aspect 

 of potassium supplying power of soils — inter- 

 relations of bases in absorption and the role 

 of potassium in plant sap buffer systems — 

 Other functions of potassium — Relations op 

 nitrogen, phosphorus and potassium . . 150 



PLATES 178 



GENERAL INDEX 219 



AUTHOR INDEX 225 



