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Abstract: The use of the materials, bullock manure, poultry manure, pig slurry and straw are being investigated in the preparation of mushroom compost in Northern Ireland. A 'synthetic' compost prepared from straw and pig slurry is being developed and useful commercial yields are being achieved (400-500 lb mushrooms per ton of compost spawned). Selected bullock manure has consistently given yields in excess of conventional horse manure composts without the need for expensive organic nitrogen supplements. Poultry litter manure and pig slurry are proving to be cheap and effective sources of nitrogen for the supplementation of horse manure composts.
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