What is potential evapotranspiration in agriculture?

What is potential evapotranspiration in agriculture?

Potential evapotranspiration (Ep) is the water vapor flux under ideal conditions of complete ground cover by plants, uniform plant height and leaf coverage, and an adequate water supply; From: Trace Fossils, 2007.

What causes potential evapotranspiration?

The rate of potential evapotranspiration (PET), the amount of water that could potentially be lost to evaporation over a vegetated surface given meteorological conditions at the time, is dependent on the intensity of solar radiation, air temperature, humidity and wind speed.Jul 25, 2012

Why does potential evapotranspiration occur?

Potential evapotranspiration, or PET, represents the combined loss of water through: 1) the plant's process of transpiration via its vascular system, and 2) evaporation of water from the earth's surface. Both are influenced by temperature, humidity, sunlight, and wind.

What causes potential evapotranspiration to vary from month to month?

Assuming that moisture is available, evapotranspiration is dependent primarily on the availability of solar energy to vaporize water. Evapotranspiration therefore varies with latitude, season of year, time of day, and cloud cover.

What is meant by potential evapotranspiration?

Potential evapotranspiration (Ep) is the water vapor flux under ideal conditions of complete ground cover by plants, uniform plant height and leaf coverage, and an adequate water supply; From: Trace Fossils, 2007.

What does evapotranspiration mean for crops?

Evapotranspiration is an estimate of the loss of water from both plants and the soil. The main drivers of evapotranspiration are sunlight, wind, humidity and temperature.

What is crop evapotranspiration?

Crop evapotranspiration is a physical process in which water passes from the liquid to the gaseous state while moving from the soil to the atmosphere. It refers to both evaporation from soil and vegetative surfaces and transpiration from plants.Apr 15, 2005

Is an increase in evapotranspiration good?

In a warming climate, increased evapotranspiration may shift the fraction of precipitation that runs off as surface water or infiltrates to the subsurface as recharge. Long-term shifts in recharge patterns can change groundwater levels and subsequently groundwater surface water interactions and soil moisture17,18.Feb 13, 2020

Why is potential and actual evapotranspiration important?

The ratio of actual and potential evaporation is an important indicator of aridity. This indicator describes the capacity of the prevailing climate to evaporate water from soils, plants, open water or other surfaces.

Why is potential evapotranspiration important?

Potential evaporation transpiration calculations are useful in calculating plant water requirements and also the losses of water to evaporation from open areas such as irrigated fields and reservoirs.

What is the relationship between actual evapotranspiration and potential evapotranspiration?

PE is the demand or maximum amount of water that would be evapotranspired if enough water were available (from precipitation and soil moisture). AE is how much water actually is evapotranspired and is limited by the amount of water that is available.