INDEX 



A 



Acids, production of in soil, 221 



Aeration, influence on ammonifi- 

 cation, 115 



Aeration, influence on denitrifi- 

 cation, 134 



Aerobes, 59 



Alfalfa, influence of, on nitrifi- 

 cation, 128 



Alfalfa, influence of, on soil fer- 

 tility, 178-180 



Alinit, 141 



Alkali, influence of, on bacteria, 

 93, 190-199 



Alkali, influence of, on microor- 

 ganisms, 191-195 



Alkali, in irrigation water, 22c;, 

 227 



Alkali, kinds of, 191 



Alkali, removal of, from soiL 

 198-199 



Alkali, salts neutralization, 197 



Alkali, soil, 191 



Alkali, stimulation of bacteria by^ 

 192, 193 



Alkali, toxicity of, 194, 195 



Alkali, antagonism amongst, 195- 

 196 



Alkali, variation in toxicity in, 

 195 



Ammonification, 18, 113 



Ammonification, importance of 

 process, 117 



Ammonification, influence of aera- 

 tion, 115 



Ammonification, influence of al- 

 kalies on, 192, 193 



Ammonification, influence of ar- 

 senic on, 206 



Ammonification, influence of ma- 

 nure on, 215, 216 



Ammonification, influence of 

 moisture on, 115, 219, 220 



Ammonification, influence of re- 

 actions on, 115 



Ammonification, organisms caus- 

 ing, 113 



Ammonification, speed of, 114 



Ammonifiers, 96 



Ammonifiers, food requirements, 

 115 



Anaerobes, 59 



Animals, relation of bacteria to, 

 IS, 16, 17 



Animalcules, i 



Antagonism, 144, 195, 196 



Antiseptics, influence on soil, 202, 

 203 



Antibiosis, 61 



Arsenic, influence on ammonifica- 

 tion, 206 



Arsenic, influence on bacteria, 

 208, 209 



Arsenic, influence on nitrification. 

 207 



Arsenic, influence on nitrogen 

 fixation, 207 



