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The amount of water potentially available to plant growth that can be stored in the soil to 100 cm depth. Profile available water takes into account variations in soil horizons and is expressed in units of millimetres of water, i.e. in the same way as rainfall. Plants can only extract water where roots can grow. Thus where a root barrier occurs within 100 cm, the PAW reported will be the PAW to the root barrier. It is important to recognise that PAW is a potential value and not all the water is equally available. |