soil pore

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Any open space within the soil. Soil porosity is the percentage of pore space. Water will not drain freely through the fine capillary pores (average diameter < 0.03 mm), which retain water through surface tension, but drains freely through the larger non-capillary pores. With 2–5% soil porosity, most water flows directly to the subsurface.

Subjects: Earth Sciences and Geography.

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