link title This page is to prepare and collect information for one or more chapters in the course. --John Eagles 09:21, 23 December 2011 (PST)
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Lava flour (or basalt flour) is used to enrich compost and to combat plant diseases. It adds many minerals to the soil.
Part of a mud brick made from sand, straw, saw dust and 15 % bentonite. Bentonite, a type of clay, can be added to compost or directly to the soil. It helps building up the clay-humus complex to enhance the fertility of a soil.
