Final answer:
Decomposition is the primary source of nutrients in soil, contributing to the breakdown of organic matter into components that dissolve and enrich the soil.
Explanation:
Most of the nutrients in soil come from decomposition. Decomposition of organic material contributes to the nutrients in the soil by breaking down organic matter into components that can dissolve in the soil solution. Aside from decomposition, additions from rain, snowfall, and dust as well as weathering of soil minerals also play a role in adding nutrients to the soil.
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