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humus

Rich, black organic material; the living component of soils where plant and animal matter has been allowed to decompose. Ideal humus: 100 parts carbon, 10 parts nitrogen, 1 part phosphorous, 1 part sulfur. Most of the important micronutrients are cations; the most important anions are boron and molybdenum. Fertile soil contains 4-10% organic matter.

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