Index — 220 — Hoagland 



Base exchange, 12-16 



Bicarbonate ions and orgajiic acids, 132 



— — and salt absorption, 144 



— — , soil solution, 12 

 Biochemical investigations, 22-24 

 Biochemistry, salt absorption, 126 

 Bioelectric potentials, 65, 66 



Black alkali soils, 13-15; plates 4, 5 



Boron, essentiality of, 27, 28, 29, 31 



Boron deficiencies in soil and liming, 32 



Boron, functions of, 31 



Boron tolerance, 33-34 



Bromide, accumulation in vacuole, 51-53 



Bromide ions, radioactive, 63 



Bromide, test ion, 51 



Buffer systems and accumulation of salts, 130-136 



Buffer systems in plants, 128, 129, 167 



Calcium, absorption by roots, 61 



Calcium absorption, relation to potassium, 164-166 



Calcium in buffer systems, 130, 131, 168, 169 



Calcium colloid in soil, 14; plate 3 



Calcium, hydrogen-ion relations, 114 



Calcium, state in plant, 167 



Carbohydrate and salt accumulation, 59 



Carbon dioxide, aerobic production, 55 



Carbon dioxide concentration in culture, 115 



Chlorosis, effect of zinc on, 43 



Citrate cycle, 140 



Citric acid in plant, 135-137 



Clay colloids, 12, 13, 15, 17, 119; plate 3 



Clay colloids, crvstalline structure, 15-17 



Climatic factors,' 20, 21, 22, 118, 119 



Climatic factors and nitrogen utilization, 142 



Climatic factors and salt absorption, 81 



Cobalt, essentiality of, 29, 43 



Cobalt, deficiency for animal, 44 



Composition of plants, effect nutrient solution, 109, 110 



Concentrations of nutrients, culture solutions, 107, 108 



Contact mechanism, 120, 121 



Controlled chambers for plant experiments, 20-22; plates 6, 7 



Copper deficiencies in soil, 32 



Copper, essentiality of, 27-29; plates 8, 9 



Cyanide, as inhibitor of salt absorption, 143 



Cytochrome oxidase, 146 



Die-back disease, prunes, 150-152, 163, 164; plates 27, 28 

 Donnan equilibrium, 50 



Electrical resistance, Halicystis, 66 

 Essential elements, 20 



