Plant Nutrition _223— Index 



Potassium, in buffer systems of plant, 130-131, 167-169 



Potassium, contact tlieory absorption, 156, 160 



Potassium, deficiency for prune trees, 150-152; plates 27, 28 



— deficiency in soils, 151, 162-163; plates 27, 28 



— effect on carbohydrate synthesis, 170-173 



— effect on respiration, 175 



— effect on starch formation, 171 



— effect on sugar concentration, 170 



- — effect wetting- and drying on fixation by soil, 153 



— exchangeable, 152 



— fixation by soil, 152-154, 158, 160-162 



— interrelation of bases in plant, 164-169 

 ■ — luxury absorption of, 167 



— nitrogen interrelations, 170, 174-175 



— nitrogen aaid phosphorus relations, 173-174 



— in photosynthesis, 170-173 



— in plant buffer systems, 164 



— in protein synthesis, 170, 171, 175 



— radioactive, 62, 63, 175 



— relation to available carbohydrate, 173 



— relation to climatic environment, 172, 173 



— relation to fruiting, 163-164 



— relations to sodium and rubidium, 168, 169 



— replaceable in soil, 153, 156-158, 160-161 



— replacement by sodium, 169 



— in sap, 168 



— soil solution, 8, 151, 154-160 



— state in plant, 175 



— supplying capacity of soil, 154 



Protein metabolism and salt accumulation, 55, 143-145, 175 



Proteins, synthesis, 141, 170, 175 



Protoplasmic membranes, permeability to cations, Q% 



Radioactive bromide, 52, 142 



Radioactive isotopes, use in absorption studies, 52-53, 62-63 



Radioactive isotopes, use in experiments, 53, 54; plate 19 



Radioactive phosphate, 94-95, 97-98; plate 19 



Radioactive rubidium, 52, 158-159 



Radiographs, 97; plate 19 



Respiration, aerobic, 55, 57-59 



Respiration of roots, effects of salts on, 126-128 



Respiratory inhibitors, 142-143 



Respiratory quotient, 134 



Root pressure, 83 



Root pressure, cycles, 85 



Roots of barley, growth conditions, 56; plates 17, 18, 2U, 26 



Roots of barley, root-shoot relations, 56-57 



Salt balances, 19, 108-112 



Salts, distribution in plant, 77-80, 100 



Sand culture, 115; plate 20 



Saps, buffer systems, 130-136 



