ethods of calculating amount of manure produced on
the farm 252, note
Fermentation of farmyard manure--
Action of _micro-organic_ life in producing fermentation 255
Two classes of _bacteria_ active in this work, _aerobies_
and _anaerobies_ 255
Conditions influencing fermentation--
_Temperature_ 256
_Openness to the air_ 256
_Dampness_ 257
_Composition of manure_ 257
Products of fermentation 257
Analyses of farmyard manure--
Dr Voelcker's experiments 259
Variation in composition 259
Amounts of _moisture_, _organic matter_
(containing _nitrogen_), and _mineral matter_ 260
Its manurial value compared with _nitrate of soda_,
_sulphate of ammonia_, and _superphosphate_ 260
Comparison of fresh and rotten manure--
The nature and amount of loss sustained in the process of
_rotting_ 261
Ought manure to be applied _fresh_ or _rotten_? 262
Relative merits of _covered_ and _uncovered_ manure-heaps 263
Methods of application of farmyard manure to the field--
Merits and demerits of the different methods 265
Setting it out in _heaps_ 265
Spreading it _broadcast_, and letting it lie 266
Ploughing it in immediately 267
Value and function of farmyard manure--
As a supplier of the necessary elements of plant-food 268
As a "universal" manure 269
Proportion in which _nitrogen_, _phosphoric acid_, and
_potash_ are required by crops 269
Proportion in which they are present in farmyard manure 270
Farmyard manure _poor in nitrogen_ 270
Lawes' and Gilbert's experiments 271