Question

how is loamy soil best for growing crops

Answer 1

The best soil, sandy loam, for most plants is rich in nutrients, well-draining and has a neutral or near-neutral pH. Loam allows the movement of water, air and nutrients to plant roots. Because roots are able to fully develop, plants are better able to withstand wind and drought when grown in loam.
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Answer 2

Loam soils are best for plant growth because sand, silt, and clay together provide desirable characteristics. First, the different-sized particles leave spaces in the soil for air and water to flow and roots to penetrate. The roots feed on the minerals in the suspended water.