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The formula as presently given in the article includes chalk. Very strange, unless the source materials are severely acidic and the chalk is needed to neutralize the acid. I live in an area with numerous mushroom growing plants and none of them use chalk in their compost, nor do they use horse or cattle manure, although there is plenty of that available in the area. They also don't use blood. The formula typically consists of straw, peat moss and poultry manure. The soil in my area is heavy adobe for the most part, rather alkaline, but they don't use any of it in their mix. The spent compost doesn't alter the the pH of the soil appreciably, nor is it depleted of nitrogen, as evidenced by the lush, dark green growth when it is spread on lawns. Sorry, I can't provide a reference; this is from direct observation, as I just hauled in one ton of the stuff yesterday for the vegetable garden. The components of the mix were readily visible at the mushroom plant, stored in the open.—QuicksilverT@ 16:43, 26 March 2010 (UTC)[reply]
