Table 3 Parameters measured in manure at different stages and methods applied
Parameter | Method | Determined during sampling (1), end of storage (2), end of acclimation (3) |
|---|---|---|
pH | Direct measurement in liquid manure | 1, 2, 3 |
Temperature | Direct measurement in liquid manure | 1, 2, 3 |
Redox potential | Direct measurement in liquid manure | 1, 2, 3 |
Dry matter content | Drying of subsamples of 10-g fresh mass at 105 °C overnight in a drying chamber. Quantification by weighting | 2, 3 |
Microbial activity | For testing the microbial activity several suggestions exist. In this case it was mineralisation of 14C-labeled glucose under anaerobic conditions | 3 |
NH4-N content | Ammonium-N, purge and trap-method. Quantification by titration [10] | 3 |
Nonvolatile N content | Analysis of dried manure by determination with element analyser after combustion | 3 |
Total N content | Calculation by addition of NH4–N content and nonvolatile N content | 3 |
Organic C content | Analysis of dried manure by determination with element analyser after combustion | 3 |
Total P content | Extraction of trace elements soluble in aqua regia [11] and phosphor quantification by ICP-OES with a matrix adjusted calibration [12] | 3 |
Total Cu content | Extraction of trace elements soluble in aqua regia [10] and phosphor quantification by ICP-OES with a matrix adjusted calibration [12]. Copper quantification by ICP-OES with a matrix adjusted calibration | 3 |