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Activator added Alfalfa animal manure autumn bark beans bedding benefit boards cardboard chopped clubroot comfrey COMPOST ACTIVATORS compost container compost heap compost trench compost tumbler composting process courgettes covered crop decompose digging Doubleday Research Association feeding Fenugreek fertilisers flowers fresh g per sq grass mowings grow green manures growth HDRA heat heavy soils Henry Doubleday Research ideal ingredients intensive farms kitchen scraps layer leaf mould leaf mould heap leaves legumes lengths 5 cm manure or compost Materials Timber mixed moisture nitrogen and potassium organic garden organic materials perennial plant foods plant material plastic Poultry manures prunings quantities recycled roots rotted Search Press shredded shredder Sinapis alba slide soil conditioner soil structure Sow broadcast sown sq metre stacked straw Strawy manures suitable supply surface mulch take longer tend tough Trifolium vegetable Vicia faba waste weed seeds weedkillers well-rotted winter worm compost Zealand box