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-forraing material. 



