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		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

Cold weather protection

87. If the temperature where you are often falls below 15°C, you will have to keep the waste mixture in your biogas unit warm.

88. If you put your biogas unit under the ground or partly under the ground, this will help to keep the waste warm.

Keep the waste warm

89. You can keep the waste mixture in your biogas unit warm by putting leaves, grass, straw or maize stalks around the large drum.

Keep the mixture warm

90. You can also keep it warm by adding a bucket or two of poultry drop, pigs mixed with other waste to the waste already in the large drum. Use one part of poultry droppings to three parts of other waste.

Use poultry droppings