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Percolation of water in the soil; see under water storage capacity.

The water that is vital for plants seeps into the soil after rainfall (rain, hail, sleet, snow). A small proportion also comes from surface precipitation (dew, frost) formed by condensation, which is absorbed directly by the dew roots just below the surface. The non-solid soil substance consists of pores of varying size, which are filled with air and/or water. The pores can make up 30 to 60% of the total volume. Depending on the pore volume, the porosity - the ratio of the void volume to the total volume - results. In dry soil all pores are filled with air.

Wasserspeicherungs-Vermögen - Graphik mit Bodenstruktur und Begriffen

The seeping water first displaces the air in the fine pores, until finally, in moist soil, air remains only in the coarse pores. Adhesive or capillary water is the water held against gravity that adheres in pores smaller than 10 µm due to the surface tension of the water (meniscus = concave water surface). The amount of adhesive water that the soil with its pores can hold against gravity is called water capacity (WK) or...

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