To provide a better environment for roots, soil amendment is used to help improve the physical properties of soil, such as water retention, permeability, water infiltration, drainage, aeration, and structure.

It brings different effects depending on the kind of soil it is applied to. For example, on clayey soils, it betters the aggregation, porosity and permeability, aeration, drainage, and rooting depth. Meanwhile on sandy soils, it improves the water- and nutrient-holding capacity.

To use the full potential of soil amendment, the duration, soil texture, soil salinity and plant sensitivity to salt and salt content, and pH of the amendment are only a few of the factors to be considered.

For a quick improvement of soil physical properties, the best choice would be an amendment that decomposes rapidly. To achieve a long-lasting improvement, it is recommended to use a slow-decomposing amendment. To have both quick and long-lasting improvement, choose a combination of amendments. (Colorado State University Extension)

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