The best in the world
I may be a little biased here because I work in a research and development capacity in the mushroom industry. If you get your compost from a reputable source it will be weed free and mushroom free! All mushroom tunnels go through a cookout stage (steamed for 24hrs) to kill off the mycelium and other things that may be in the compost. This is a legislative requirement. Some of the smaller farmers do not do this or do not do it effectively and this can lead to problems.
In relation to the value of compost as a fertiliser it is fantastic but it has to be left to overwinter. If anyone is interested in reading literature on this pm me and I can forward to enough bump to keep you going for a while. Most of the mushroom compost is spread on land at the moment as a fertiliser or in the reclaimation of mines and dumps. Potatoes love mushroom compost! I work with a lot of farmers around Ireland so if you let me know I can put you in touch with someone reliable in your area.
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