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Water potential is the potential energy of water per unit volume relative to pure water in reference conditions. Water potential quantifies the tendency of water to move from one area to another due to osmosis , gravity , mechanical pressure and matrix effects such as capillary action (which is caused by surface tension ).
In ecology, pressure-volume curves describe the relationship between total water potential (Ψt) and relative water content (R) of living organisms. These values are widely used in research on plant-water relations and provide valuable information on the turgor, osmotic and elastic properties of plant tissues. [1] [2] [3] [4]
Water retention curve is the relationship between the water content, θ, and the soil water potential, ψ. The soil moisture curve is characteristic for different types of soil, and is also called the soil moisture characteristic. It is used to predict the soil water storage, water supply to the plants (field capacity) and soil aggregate stability.
Midday leaf water potential is less commonly used as it is more variable and does not correlate well with other physiological measurements of water status. However, midday water potentials can be used to determine times of peak water stress or diurnal changes in plant water status. [5] Additional variables and methods that involve pressure ...
Turgor pressure can be deduced when the total water potential, Ψ w, and the osmotic potential, Ψ s, are known in a water potential equation. [30] These equations are used to measure the total water potential of a plant by using variables such as matric potential, osmotic potential, pressure potential, gravitational effects and turgor pressure ...
The low water potential of the atmosphere, and relatively higher (i.e. less negative) water potential inside leaves, leads to a diffusion gradient across the stomatal pores of leaves, drawing water out of the leaves as vapour. [1] As water vapour transpires out of the leaf, further water molecules evaporate off the surface of mesophyll cells to ...
The driving force of the movement of water is the water potential gradient. The water potential gradient is defined by comparing the potential energy of water to pure water at standard conditions. This water potential gradient must be maintained from the soil through the plant and into the air via transpiration. [1] In the xylem, water is ...
On the other hand, as the VPD increases, the plant needs to draw more water from its roots. In the case of cuttings, the plant may dry out and die. For this reason the ideal range for VPD in a greenhouse is from 0.45 kPa to 1.25 kPa, ideally sitting at around 0.85 kPa. As a general rule, most plants grow well at VPDs of between 0.8 and 0.95 kPa.