Plant Nutrition — 221 — Index 



Exudation, 60, 83, 84-88 

 Exudation, auxin effects, 84-86 

 Exudation, CO2 eflfects, 86, 87 

 Exudation, cycles, 85 

 Exudation, oxygen effects, 86, 87 



Fertilizers, fixation by soil colloids, 16 



Glass houses for plant experiments, 21, 22 

 Glutamic acid, 141 

 Glutamine, 139, 141, 142 

 Guttation, 84 



Hydrogen-ion concentration of culture, 17, 18, 61, 112-114; 



plate 23 

 Hydrogen-ion concentration of sap, 52, 61, 132, 134 

 Hydrogen ions, biological generation in soil, 12 

 Hydroponics, 105; plate 20 



Iodine, essentiality of, 29 



Ion exchange in roots, 63, 120, 121 



Kaolinite, 16 



Liming of soil, 16 



Little-leaf disease, 34, 36; plate 12 



Magnesium in buffer systems, 167, 168 



Magnesium, relation to potassium, 164-166 



Malic acid, 135-137 



Malonic acid, 142, 143 



Manganese and aeration of culture, 30 



Manganese, deficiencies in soil, 32 



Manganese, essentiality of, 27-29 



Mangenese, functions of, 30-31 



Metabolism, effects on a.bsorption of salts, 54, 75, 122, 144-146 



Metals in oxidation-reduction, 23, 30 



Micronutrient element, use of term, 28 



Micronutrient elements, 26 



, functions of, 29-31 



Micronutrients and animal nutrition, 43-45 

 Micronutrients, availability in soil, 32; plates 12, 13 

 Micronutrients, concentrations in culture solutions, 29, 110; 



plates 8-12, Ha, 14b 

 Micronutrients, impurities in water and salts, 27-28, 33 

 Micronutrients, practical aspects, 32 

 Micro-organisms in water cultures, 106 

 Micro-respirometer methods, 62, 142 

 Mobility of ions in cells, 66 

 Molybdenum, essentiajity of, 28; plates 10, 11 

 Molybdenum, role of, 29 

 Molybdenum, toxicity to animals, 45 



