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Hypothesis: If the permeability of different soil types are tested then sand will be the most permeable, and clay the least permeable. Variables: Independent Variable: Type of soil Dependent Variable: Permeability Control Variable: amount of moisture added, amount of soil, temperature Experimental Set-Up:
Soil texture is the size of the solid particles in a soil. It is important because it affects the moisture content and aeration (the circulation of air). It also affects the retention of nutrients, the ease of cultivation, and the root penetration of crops and other vegetation.