Water storage capacity is one aspect of the complex process of plant water balance. Other components are water extraction and water stress (see there in detail).
For optimum growth, vines require soils with good water storage capacity and a constant, but not excessive, water supply. A soil with this characteristic can store water efficiently and release it slowly, which enables even irrigation and reduces the risk of drought stress. The essential water seeps into the soil after precipitation (rain, hail, sleet, snow).
A small proportion also comes from surface precipitation formed by condensation (dew, frost), which is absorbed directly by the dew roots located just below the surface. The non-solid soil substance consists of pores of different sizes that are filled with air and/or water. The pores can make up around one third to two thirds (30-60%) of the total volume. The porosity - the ratio of the void volume to the total volume - depends on the pore volume. In dry soil, all pores are filled with air.
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For my many years of work as an editor with a wine and culinary focus, I always like to inform myself about special questions at Wine lexicon. Spontaneous reading and following links often leads to exciting discoveries in the wide world of wine.
Dr. Christa Hanten
Fachjournalistin, Lektorin und Verkosterin, Wien