xvi Contents 



PART V 



Pages 



BACTERIA IN BARNYARD MANURE . . . .303-356 



CHAPTER XXVII 



MANURE: ITS COMPOSITION AND LOSSES 303-317 



Bacterial change in manure Mechanical constitution 

 and bacterial change Chemical composition and bac- 

 terial change. Losses from farmyard manure Value 

 of manures Losses of elements caused by digestion 

 Other causes for losses Importance of proper storing 

 The loss of nitrogen Aerobic and anaerobic decompo- 

 sition Bacterial activities and money losses. 



CHAPTER XXVIII 



THE BACTERIA IN MANURE AMMONIFICATION 318-325 



Changes in manure-bacteria Three stages of change 

 Bacteria and conditions affecting decomposition. Am- 

 monification Hippuric acid Uric acid The formation 

 of ammonia in liquid excreta Loss of ammonium car- 

 bonate Urease Other ammonia-forming bacteria 

 Importance of ammonification. 



CHAPTER XXIX 



DENITRIFICATION IN MANURES .326-336 



Nitrates in manure Denitrifying bacteria Experi- 

 ments in denitrification The danger of denitrification. 

 Losses of elementary nitrogen The problem of the loss of 

 nitrogen Recent information on the problem. Soluble 

 nitrogenous substances made insoluble The change of 

 available into unavailable nitrogen Conditions affect- 

 ing the change. Conclusion. 



CHAPTER XXX 



NITRIFICATION IN MANURES 337-341 



Nitrification in manures -Effect of liquid The compost 

 heap The loss of humus-forming material. 



