capillary porosity
The aggregate volume of small pores within a particular soil to retain water against the force of gravity.
GardenWeb Glossary of Botanical Terms
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Porosity
Porous terra-cotta allows plant roots to breath while still offering some insulation.
An air-filled porosity test is done to check this, by putting a measured amount of potting mix in a cylinder and adding water until it is thoroughly soaked. The water is allowed to drain out and the drainage water is measured for volume.
Perlite Small globules of heat expanded volcanic rock used to increase the porosity and drainage of potting mixes. Often used in the rooting of cuttings as it is both inert and sterile.
Compost scientists say compost piles need porosity—the ability for air to move into the pile. I like to think of porosity in terms of fluffiness. A fluffy pile has plenty of spaces—or pores—for air to move about.
Aeration can also be affected by wind, moisture content, and porosity (spaces between particles in the compost pile). Composting reduces the pile’s porosity and decreases air circulation.
Its porosity and sponge-like structure help aerate soil and retain moisture, while at the same time allowing for good drainage.
They do however have some porosity which allows limited moisture movement with the wood underneath, providing more stability between the stain and the substrate.
Pots come in a range of colors, sizes, shapes, and designs. Glazing reduces porosity, so soil retains water longer. Glazed saucers protect surfaces from moisture.
Available in a variety of colors and designs
Retains water better than unglazed clay ...
Compost, rich in organic matter, can successfully be used for potting soil. Adding material to increase it porosity may be necessary. Materials used to create beneficial air pockets in potting soil include:
Vermiculite.
Perlite.
Sand.
Bark.
Along much of Colorado's Front Range, soils may be shallow, gravelly or consist of heavy clays that drain poorly and have low porosity. These conditions prevent deep-root development of tall fescue.
Tilth-The physical condition of a soil, e.g., aggregation, porosity, etc., and its ability to support seed germination and plant growth.
Activated charcoal is used to de-activate pesticides (mainly herbicides) and is available at water conditioning companies. Due to its high degree of microporosity, ...
Commercial seed-starting mixes, usually composed of vermiculite and peat, without any true soil, are recommended for starting seeds. They're sterile, lightweight and free from weed seeds, with a texture and porosity especially suited to the needs of ...
These organisms work the soil, break down the organic matter into a usable form and provide the porosity that is so much needed. Air and water can penetrate better when not tilled.
Marantas flourish in medium or filtered light. Full sunlight will burn the leaves, causing dry brown edges to appear. Soil should be humus-rich, with some peat moss and bark chips and a bit of perlite or sand for porosity.
 See also: Water, Plant, Soil, Grow, Drainage
  
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