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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:
A distinction is made between natural and actual soil fertility. The former is determined by the nutrients and moisture present in the soil and by other environmental conditions. Actual soil fertility is the amount of nutrients and moisture derived from the soil by the plants in a given year.