Water affects soil formation, structure, stability and erosion but is of primary concern with respect to plant growth. Water is essential to plants for four reasons:
- It constitutes 85%-95% of the plant's protoplasm.
- It is essential for photosynthesis.
- It is the solvent in which nutrients are carried to, into and throughout the plant.
- It provides the turgidity by which the plant keeps itself in proper position.
In addition, water alters the soil profile by dissolving and redepositing minerals, often at lower levels, and possibly leaving the soil sterile in the case of extreme rainfall and drainage. In a loam soil, solids constitute half the volume, air one-quarter of the volume, and water one-quarter of the volume, of which only half will be available to most plants.
Read more about this topic: Soil
Other articles related to "soil, water, soil water, soils":
... Another important element of Richard’s work was in the field of soil-water-plant relations, and led to the standardisation of characteristic soil-water properties ... USDA Salinity Laboratory in Riverside, Richards correlated water content at certain water potential values with then current soil water parameters ... much to knowledge of the energy status and transport of water in soil ...
... All those brought through the roots, with the exception of hydrogen, which is derived from water, are taken up in the form of ions ... All the hydrogen utilised by the plant originates from soil water and participates with the carbon dioxide in the photosynthetic production of sugars and release of oxygen as a byproduct ... nutrient needs supplemented by spraying a water solution of nutrients on their leaves, but nutrients are typically received through the roots by Mass flow ...
... The role of soil in retaining water is significant in terms of the hydrological cycle including the relative ability of soil to hold moisture and changes in soil moisture over time Soil water that is not retained or ... Soil that is at field capacity (among other reasons) may preclude infiltration so to increase overland flow ... Both effects are associated with ground and surface water supplies, erosion and salinity ...
... He worked at the USDA Bureau of Soils from 1902 to 1906 as a soil physicist ... His fields of expertise included soil physics, gas properties, acoustics, fluid mechanics, and blackbody radiation ... Buckingham's first work on soil physics is on soil aeration, particularly the loss of carbon dioxide from the soil and its subsequent replacement by oxygen ...
... Vegetation influences slope stability by removing water through transpiration ... Transpiration is the vaporisation of liquid water contained in plant tissue and the vapour removal to the air ... Water is drawn up from the roots and transported through the plant up to the leaves ...
Famous quotes containing the words water and/or soil:
“Before the land rose out of the ocean, and became dry land, chaos reigned; and between high and low water mark, where she is partially disrobed and rising, a sort of chaos reigns still, which only anomalous creatures can inhabit.”
—Henry David Thoreau (18171862)
“But the nomads were the terror of all those whom the soil or the advantages of the market had induced to build towns. Agriculture therefore was a religious injunction, because of the perils of the state from nomadism.”
—Ralph Waldo Emerson (18031882)