The amount of water required to fill up the pore spaces in soil particles by replacing all air held in pore spaces, is known as

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Saturation capacity refers to the maximum amount of water that soil can hold in its pore spaces when all the air has been displaced. This is different from field capacity, which is the amount of soil moisture or water content held in the soil after excess water has drained away and the rate of downward movement has decreased, and available moisture, which is the portion of water in the soil that can actually be absorbed by plants.

The Amount of Water Required to Fill Up the Pore