A layer of soil (A Horizon) is on the upper floor (Top soil) is best with A layer of soil water, mainly consisting of a rock, mineral, and อินทรีย objects degrade completely. Soil clay agricultural area with dark floors will be County to loosen. When the root's digestion plants and has retained อินทรีย object. Normally, the structure of the soil, the soil is soft, but if the konklom condensation. The structure of the soil in A floor-pad.
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