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The yield of biogas from a particular feedstock will vary according to:
- Dry matter content, food wastes in particular will vary greatly
- The energy left in the feedstock, if it has undergone prolonged storage it may already have begun to break down
- Length of time in the digester
- The type of AD plant and the conditions in the digester
- The purity of the feedstock
The table below shows data on the potential biogas yields of feedstocks commonly used in anaerobic digestion (numbers given in italics are from a report by the NNFCC and Andersons Centre, all other numbers are from Biogas from Energy Crop Digestion by the IEA). All figures are based on fresh weight unless stated.
| Feedstock | Dry Matter % | Biogas Yield m3/tonne | Feedstock | Dry Matter % | Biogas Yield m3/tonne |
| Cattle slurry |
10 |
15-25 |
Potatoes |
- |
276-400 |
| Pig slurry |
8 |
15-25 |
Rye grain |
- |
283-492 |
| Poultry |
20 |
30-100 |
Clover grass |
- |
290-390 |
| Grass silage |
28 |
160-200 |
Sorghum |
- |
295-372 |
| Whole wheat crop |
33 |
185 |
Grass |
- |
298-467 |
| Maize silage |
33 |
200-220 |
Red clover |
- |
300-350 |
| Maize grain |
80 |
560 |
Jerusalem artich. |
- |
300-370 |
| Crude glycerine |
80 |
580-1000 |
Turnip |
- |
314 |
| Wheat grain |
85 |
610 |
Rhubarb |
- |
320-490 |
| Rape meal |
90 |
620 |
Triticale |
- |
337-555 |
| Fats |
up to 100 |
up to 1200 |
Oliseed rape |
- |
340-340 |
| Nettle |
- |
120-420 |
Reed canary grass |
- |
340-430 |
| Sunflower |
- |
154-400 |
Alfalfa |
- |
340-500 |
| Miscanthus |
- |
179-218 |
Clover |
- |
345-350 |
| Whole maize crop |
- |
205-450 |
Barley |
- |
353-658 |
| Flax |
- |
212 |
Hemp |
- |
355-409 |
| Sudan grass |
- |
213-303 |
Wheat grain |
- |
384-426 |
| Sugar beet |
- |
236-381 |
Peas |
- |
390 |
| Kale |
- |
240-334 |
Ryegrass |
- |
390-410 |
| Straw |
- |
242-324 |
Leaves |
- |
417-453 |
| Oats grain |
- |
250-295 |
Fodder beet |
- |
420-500 |
| Chaff |
- |
270-316 |
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A comprehensive list of biogas yield data is available via the CROPGEN Database. The full database contains data for 729 different feedstocks and is available to download in Access format from CROPGEN here (4th item on the table).
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