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A term describing a lime or limestone containing both magnesiumcarbonate and calcium carbonate. An element, usually occurring as magnesium carbonate, which is acompound useful in correcting soil acidity. Any material, either organic or inorganic, containing a superabundanceof plant food or material which upon decomposition or nitrificationbecomes available plant food. An earthy, crumbly deposit consisting chiefly of clay and calcium car-bonate much used as a substitute for land lime. "Green sand" marlmay be acid, but good chalk marl is valuable for neutralizing acids. Black swamp earth which varies widely in available plant food,very similar to peat except that water is not constantly present duringthe process of decay; hence the nitrifying bacteria are present and thematerial is better suited for immediate use as plant food. It is in anIntermediate stage between leaf mould and peat. |
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