The Evapotranspiration (ET) rate equals the total loss of water by evaporation from the soil surface, plus the transpiration from turfgrass or ornamental plants, over a given area, in 24 hours. ET = inches/day

Evapotranspiration (ET) is a term used to describe the water consumed by plants over a period of time. Evapotranspiration is the water loss occurring from the processes of evaporation and transpiration. Evaporation occurs when water changes to vapor on either soil or plant surfaces.

ET (o) is defined as the ET rate of healthy turf, completely covering the ground to a uniform height of 4 -6 inches and having an adequate supply of water with no microclimate factors influencing it. Why is ET important? Evapotranspiration or reference ETo, is an important reference point for irrigation water use calculations.

The most commonly practiced way of estimating the crop ET rate (or crop water use rate) for a specific crop requires first calculating reference ET (ETref) and then applying the crop coefficients (Kc) to estimate actual crop ET (ETc) as:

Alfalfa-reference ET is defined as the ET rate from an extensive, uniform surface of dense, actively growing alfalfa, about 20 inches tall and not short of soil water. The terms “reference ET” and “reference crop ET” often are used interchangeably and they both represent the same ET rate from a tall alfalfa surface.

This chapter explains the concepts of and the differences between reference crop evapotranspiration (ET o) and crop evapotranspiration under standard conditions (ET c) and various management and environmental conditions (ET c adj).

Understanding evapotranspiration, also called ET, the rate at which plants use water is fundamental to proper irrigation scheduling and management.

The Evapotranspiration (ET) Method is an excellent way to determine how much water to apply based on estimates of the amount of water lost from the vineyard. Evapotranspiration is the sum of water loss from evaporation from the soil surface and a plant’s loss of water through transpiration (water vapor moving out of leaf stomata).

2020年9月28日 · By calculating the ET rate, we can approximate moisture loss and determine how long and often to run sprinkler systems and drip irrigation lines. To find information on the ET rate in your area, visit Irrigation.org.

In general, ET can be defined as the transfer of water in the form of water vapor (very small water particles that cannot be visually seen) from the soil surface, a water body, vegetation, and other surfaces to the atmosphere. Water evaporates from any …