Summary
This two-year field experiment in south-western France evaluated whether sowing cover crop mixtures improves establishment success and biomass yield stability compared to pure stands of brassicas, legumes, and grasses. Brassica species demonstrated the highest emergence vigour and a positive correlation between establishment and final biomass yield, whilst legumes such as faba bean showed slower emergence and biomass yields dependent primarily on post-establishment climate. The findings suggest that establishment vigour and mixture composition strategies may influence the consistency of ecosystem service provision in cover cropping systems.
Regional applicability
The study was conducted in south-western France under temperate European conditions, which share climatic and agronomic similarities with southern and central United Kingdom regions. Results on brassica emergence dynamics and legume performance may be transferable to UK cover cropping practice, though the significant intra- and inter-annual variability observed suggests that UK practitioners should account for local weather variation and seasonal timing when selecting cover crop species and mixtures.
Key measures
Seedling emergence vigour (°Cd), final emergence rates, establishment success, biomass yield (t·ha⁻¹), soil cover, weed suppression, nitrogen catch crop and nitrogen green manure services
Outcomes reported
The study compared seedling emergence dynamics, establishment success, emergence vigour, and final biomass production of cover crop mixtures versus pure stands over a two-year field trial. It also evaluated ecosystem service provision including soil cover, weed suppression, nitrogen catch crop capacity, and nitrogen green manure potential.
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