Compost process require the emphasizes of nitrogen ratio, the C:N ratio and calcium. So what makes calcium to be important at composting process? One product of the breakdown of organic matter by bacteria is organic acids.
In a well aerated compost pile, these organic acids are themselves broken down in the later stages of the composting process, but if there is any shortage of oxygen, they can begin to accumulate, making the compost acidic. This is a problem because bacteria do not like acidic conditions at all.
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