Posted: Yesterday at 09:39
Note of caution with mushroom compost Tootles.
mushroom compost will not qualify as organic. I can't find a mushroom producer selling mushroom compost as certified organic. Its not possible.
They use products like methoprene, cyromazine and diflubenzuron, Dimlin and Diazanon to control flies and fungus gnats. Also benomyl, thiabendazole and chlorothalonil to control any fungal infections.
These chemicals are what is termed "persistent" in that they do not break down quickly or under microbial action.
Nutrient levels are negligible. (N=0.7% , P= 0.3% , K= 0.3% ) compared to manure
(N=1%, P=1%, K=1% approx)
There is also a high salt level and chalk added in most spent mushroom compost that has to be leached out before the crop is planted.
It does make a good soil conditioner but you are not getting a nutrient level high enough to grow a good crop of plants.