What is the formula of water use efficiency?
The water use efficiency is the ration between dry matter production of a plant (the output) divided by evapotranspiration. Therefore the equation for Water use efficiency (WUE) will be written as: Dry matter production (kg/ha) / ET (in mm).
How do you calculate instantaneous water use efficiency?
The instantaneous WUE is calculated as the net photosynthetic rate (An) divided by transpiration rate (E).
How do you calculate transpiration efficiency?
At a plot level, it can be defined as water-use efficiency (WUE) = grain yield/water received (in millimetres; through either irrigation or rain) or as WUE = total biomass/evapotranspiration. At a plant level, the transpiration efficiency (TE), an important component of WUE, is defined as TE = biomass/water transpired.
How do C4 plants increase their water use efficiency?
Improved leaf and plant water use efficiency in C4 species is due to both higher photosynthetic rates per unit leaf area and lower stomatal conductance. By contrast, leaf and plant water use efficiency is increased in C4 plants under elevated CO2 because of reduced stomatal conductance.
Which method is highest water use efficiency?
The center of the leaf (to the side of the main vein) and the middle edge have the highest photosynthetic rates and transpiration rates, but the tip of the leaf has the highest water-use efficiency.
What is irrigation water use efficiency?
In irrigation, Water Use Efficiency (WUE) represents the ratio between effective water use and actual water withdrawal. It characterizes, in a specific process, how effective is the use of water. Along a canal, the conveyance efficiency is the ratio between the volume of water at delivery points and inflow at entrance.
What is photosynthetic water use efficiency?
photosynthetic water-use efficiency (also called instantaneous water-use efficiency), which is defined as the ratio of the rate of carbon assimilation (photosynthesis) to the rate of transpiration, and.
How do you calculate rainwater efficiency?
The Rain Water Use Efficiency (RWUE) was calculated by dividing the grain yield (kg/ha) to cumulative rainfall (mm) from sowing to harvest.
What is transpiration efficiency?
Transpiration efficiency (TE), which is defined as the amount of biomass produced per unit of water transpired, has been suggested as a trait of interest to improve yield in drought-prone environments, in particular where crops rely on stored soil moisture [3,4,5].
Which type of photosynthesis achieves the highest water use efficiency?
photosynthesis
Since C4 species can maintain high photosynthetic rates even when stomatal conductance is low compared with their C3 counterparts, it follows that C4 photosynthesis promotes higher water use efficiencies (WUEs) than are found in C3 species (e.g. Rawson et al., 1977; Morison and Gifford, 1983; Monson, 1989; Huxman and …
What is field water use efficiency?
Crop water use efficiency is the yield of the crop (y) per unit of water lost through evapotranspiration of the crop (ET) whereas field water use efficiency is the ratio of yield of the crop to total amount of water used in the field (or in other words water requirement – WR).
What is the formula of WUE?
How is the efficiency of water use calculated?
Water use efficiency (WUE) is usually calculated based on the grain yield or total biomass produced per unit of water consumed by crops. The quantity of water consumed by crops is estimated according to the total amount of water used from the plant and soil surfaces in addition to that retained within plant structures.
Why is water use efficiency important in agriculture?
Water-use efficiency is an important subject in agriculture in semiarid regions, because of the increasing areas under irrigation and the high water requirements of crops.
How does temperature affect the efficiency of water?
Once the temperature exceeded the threshold, further increases in temperature reduced water-use efficiency as a result of increased rates of evapo-transpiration. The temperature threshold differs from the optimal temperature for photosynthesis, and differs between plant species (Wang et al., 2010).