Written by Tom Reynolds
The Sustainable Farming Incentive (SFI): A Review of Legume Fallow and Herbal Lays
Reflecting on 2024, two options, the Legume Fallow and Herbal Lays, stand out for their potential benefits and challenges. Here, we review these options based on practical experiences and their implications for farm systems.
Legume Fallow Option
Challenges and Considerations:
- Establishment Difficulties: Small-seeded legumes like clover and vetch can be challenging to establish. Expensive seed mixes and reliance on shallow cultivation or broadcasting add to the complexity, particularly under varying moisture conditions at harvest.
- Time Pressures: Busy harvest periods may not allow for the precise timing needed for optimal establishment.
- Grass Weed Control: A lack of effective grass weed management during the fallow period can undermine the benefits of this option.
- Slug Activity: Increased slug pressure often affects the following crop, requiring vigilance and management.
- Nitrogen Lock-Up: Woody growth during the autumn can tie up nitrogen, making the establishment of first wheats particularly difficult in no-till systems.
- Short-Term Benefits: Realizing the benefits of the legume fallow within one year is challenging. The option is best seen as a two-year commitment, with improvements such as nitrogen fixation and soil structure enhancement becoming apparent over time.
Key Benefits:
- Nitrogen Fixation: Legumes fix atmospheric nitrogen, benefiting subsequent crops by reducing synthetic fertilizer needs.
- Soil Structure: Deep-rooting plants like vetch and berseem clover improve soil porosity and resilience.
- Pollinator Support: Legume fallows attract pollinators, enriching the farmed landscape’s biodiversity.
Suggestions for Improvement:
- Focus on more reliable species such as beans, peas, vetch, and berseem clover.
- Consider combining legume fallow with a summer or overwintered cover crop for more immediate results. Though this requires three establishments, it offers three opportunities to manage weeds, build soil health, and enhance productivity.
Herbal Lays
Challenges and Considerations:
- Establishment: Thin soils benefit immensely from herbal lays, but herbicide use in chemical farming can hinder establishment. Proper timing and reduced reliance on herbicides are critical.
- Clover Management: Difficulty in destroying clover can be seen as a benefit, with its persistence aiding nitrogen availability and soil coverage.
- Time to Mature: Like legume fallows, herbal lays require patience. Significant improvements in soil health and productivity typically emerge after three years.
Key Benefits:
- Soil Health: The inclusion of herbs like chicory and plantain alongside legumes improves soil structure, organic matter, and water retention.
- Livestock Integration: Herbal lays create opportunities to incorporate livestock into arable systems, diversifying income streams and enhancing nutrient cycling.
- Thin Soil Suitability: On marginal soils, herbal lays provide a transformative impact, building resilience and productivity.
Practical Insights for SFI Options
Both options require a long-term view to realize their full potential. Immediate results may be better achieved by stacking options, such as:
- A summer cover crop.
- An overwintered cover crop.
- A spring-summer cover crop.
This approach offers multiple benefits, including weed management, soil health improvement, and pollinator support, albeit with increased establishment efforts.
Conclusion
The SFI options, while promising, demand careful planning and realistic expectations. In particular, the legume fallow and herbal lays options shine as investments in future soil health, nitrogen management, and biodiversity. By aligning practices with these insights, farmers can maximize the program’s benefits while addressing immediate farm challenges.
