AD Medium-term
AD Medium-Term offers great potential for biogas production where well managed Aber HSG leys are the cheapest source of nutrition for meat and milk production.
Studies that have been carried out at Germinal Horizon Aberystwyth show that Aber HSG ryegrasses perform better when compared to general grassland mixtures.
All Aber High Sugar Grass (HSG) varieties outperformed mixed grassland with the conclusion that higher water-soluble carbohydrate (WSC) content in grass has a positive effect on both the yield and rate at which biogas is produced.
Germinal is setting up further research at Germinal Horizon Aberystwyth to compare Aber HSG varieties with alternative feedstocks that have a range of D-values and at varying harvest dates.
Aber HSG varieties that have been bred for higher WSC content and rank high for D-value offer the ideal combination of characteristics for an AD feedstock, whether ensiled.
| kg/acre | Variety | Type |
| 6.00 | AberEcho | Hybrid ryegrass (T) |
| 8.00 | AberWolf | Perennial ryegrass |
| 14.00 |
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| Sowing rate | 34.5kg/ha (14kg/acre) |
| Sowing time | March/April or August/September |
| Sowing depth | 15mm (½ inch) or broadcast |
| Sowing instructions | – Drill into a fine tilth
– Moist and warm soil conditions (minimum 5˚C) – Roll before and after drilling for good soil-to-seed contact
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| Additional comments |