|Bio-Intensive Approach to Small-Scale Household Food Production (IIRR, 1993, 180 p.)|
In heavy clay, cover crops add humus and stimulate microorganisms to-loosen rock-hard compaction and create a crumbly, well-aerated and well-drained soil structure.
In sandy soils, the extensive, deep-penetrating roots of cover crops bring up needed nutrients that have leached into the subsoil. As the nutrients decompose, the matted roots give the soil enough body to hold onto nutrients and water that otherwise would quickly drain below the reach of plants.
In nitrogen-deficient soils, velvet bean, hyacinth bean, jackbean and winged bean treat nitrogen deficiency.
In dry conditions, cover crops maintain lower soil temperatures and, thereby, conserve microorganisms and earthworms, and generally conserve the soil's organic matter and humus.
Quick Ways To Better Sail. 1990. Organic Gardening Magazine. 16 pp.