 |  | Better Farming Series 31 - Biogas: What it is; How it is made; How to use it (FAO, 1984, 52 p.) | ||
 |  | (introduction...) | ||
| | Preface | ||
|  | Introduction | ||
| | How to build a small biogas unit | ||
| | Waste materials | ||
| | Time | ||
| | Cold weather protection | ||
| | Stirring the waste mixture | ||
| | When the gas is made | ||
| | Using your biogas | ||
| | Using the fertilizer | ||
| | Taking care of your biogas unit | ||
| | Making more biogas | ||
