I just got a bag of powdered dolomite lime. I'm not quite sure how much I need to add and if I should add any.
I'm using mostly old compost, worm castings and peat in my "upper" soil mix. How much would you say for a 2x2x2 hole (in cups or handfuls please)?
It's good for the Magnesium and Calcium
(their absence can cause nute lock).
I googled worm castings and lime and several growers use them together so it's not a problem to mix limes and worm castings (= not animal manure)
However, I think we should avoid manures and lime as this other article points out:
All soils having a deficiency of calcareous earth, and which do not effervesce with acids, are improved by lime, either mild or quick lime. Sandy soils are improved more than clay. When a soil deficient in calcareous matter contains much soluble vegetable matter, the application of quick lime should always be avoided, as it either tends to decompose the soluble matters, by uniting to them carbon and oxygen so as to become mild lime, or it combines with the soluble matters and forms compounds having less attraction for water than the pure vegetable substance. The case is the same with regard to most animal manures, but the operation is different in different cases, and depends upon the nature of the animal matter. Lime forms a kind of insoluble soap with oily matters, and then gradually decomposes them by separating from them oxygen and carbon. It combines likewise with the animal acids, and probably assists their decomposition by abstracting carbonaceous matter from them combined with oxygen, and consequently it must render them less nutritive. It tends to diminish likewise the nutritive powers of albumen from the same causes, and always destroys to a certain extent the efficacy of animal manures, either by combining with certain of their elements, or giving them new arrangements. Lime should never be applied with animal manures unless they are too rich, or for the purpose of preventing noxious effluvia. It is injurious when mixed with common dung, and tends to render the extractive matter insoluble; and with almost all soft animal or vegetable substances lime forms insoluble composts, and thus destroys their fermen-tive qualities.
Such compounds, however, exposed to the continual action of the air, alter in course of time: the lime becomes a carbonate, and the animal and vegetable matter enter by degrees into new compounds suited for vegetable nourishment. In this view lime presents two great advantages for the nutrition of plants: the first, that of disposing certain insoluble bodies to form soluble compounds; the second, that of prolonging the action and nutritive qualities of substances beyond the time during which
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they would be retained if these substances were not made to enter into combination with lime.
So lime cancels the good effects of animal manures.
Other articles don't make such a big deal about manures and lime, just mentioning lime as a fertilizer like manures are. Actually when you google it, the 1st page is Corto's post, lol!!! I don't know???!!!?? I'll just add a bit of lime (how much? thanks)
and a bit of manures in the "upper soil mix" leaving most of the rich stuff at the botttom without any lime
. But before adding lime we should test the pH, as an alkaline soil can be as bad as an acidic soil (and mj likes it more on the acidic side).
Later and good luck!
Edited by Corto Malteze, 10 April 2009 - 11:52 AM.