<Li> The absence of toxic substances which may inhibit plant growth . </Li> <P> The following properties contribute to soil fertility in most situations: </P> <Ul> <Li> Sufficient soil depth for adequate root growth and water retention; </Li> <Li> Good internal drainage, allowing sufficient aeration for optimal root growth (although some plants, such as rice, tolerate waterlogging); </Li> <Li> Topsoil with sufficient soil organic matter for healthy soil structure and soil moisture retention; </Li> <Li> Soil pH in the range 5.5 to 7.0 (suitable for most plants but some prefer or tolerate more acid or alkaline conditions); </Li> <Li> Adequate concentrations of essential plant nutrients in plant - available forms; </Li> <Li> Presence of a range of microorganisms that support plant growth . </Li> </Ul> <Li> Sufficient soil depth for adequate root growth and water retention; </Li>

Which feature of a soil would most influence its fertility
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