Final answer:
Plants primarily obtain nutrients from the A horizon, also called the topsoil, which is a crucial layer rich in organic and inorganic nutrients for plant growth.
Explanation:
Plants get the majority of their nutrients from the A horizon of the soil. The A horizon, also known as the topsoil, is rich in organic material and inorganic products of weathering, making it a vital source of nutrients for plant growth. Rainwater percolating through this layer carries essential materials for plants, and microbial processes support plant growth in this horizon.
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