Is it good to mix sand with soil?
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When you mix coarse sand granules into your soil, it helps to establish more small air pockets in the soil mixture. These air pockets provide passageways for plant roots to successfully reach nutrients, oxygen and water. In addition, those sand granules will also help to encourage water drainage in the soil.
I usually add some sand to my soil. I did a few granulometric analysises, which show that my soil has high percentages both of clay and of silt (so very low in sand). On a figure (which now I can’t find anymore), I saw that more sand will help to keep more water in soil (there is, IIRC, a sweet point of around 30% of sand; much more sand will make water flow away).