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There are three types of soil: the acidic soil, alkaline soil (or base) and the neutral soil. Their nature varies according to their ph. Below the index 7, the soil is alkaline, more than 7 it is acid! Between 6.5 and 7.5, the soil is neutral, constituting the ideal configuration for the vast majority of cultures. For surely the nature of your soil, kits are available in garden to a test, knowing that in general a sandy soil or organic acid is, unlike a limestone which is rather alkaline.
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