Abstract
AbstractCrop evapotranspiration under deficit soil water conditions must be quantified to accurately manage deficit irrigation and crop water stress and achieve targeted water savings. A stress coe...
Highlights
The crop coefficient method as described in Food and Agriculture Organization (FAO) Irrigation and Drainage Paper 56 (FAO-56) (Allen et al 1998) is commonly used to estimate evapotranspiration of crops and other vegetated surfaces
When root water uptake is limited by large negative soil water potential due to soil water deficit (SWD), stomata close to preserve plant turgor
The difference between reduction in irrigation amount and ETa was because all treatments received the same amount of precipitation, deficit irrigation treatments used more stored soil water, and, in 2008, the deficit treatments lost less water to deep percolation
Summary
The crop coefficient method as described in Food and Agriculture Organization (FAO) Irrigation and Drainage Paper 56 (FAO-56) (Allen et al 1998) is commonly used to estimate evapotranspiration of crops and other vegetated surfaces. In this method, the evapotranspiration of a nonstressed crop (ETc) is the product of the calculated evapotranspiration of a standardized reference crop (ETref) multiplied by a crop coefficient specific to a crop, the growth stage, and growing conditions. Under the nonstandard condition in which inadequate soil water restricts the ability of the crop to meet the evaporative potential of the atmosphere, a stress coefficient (Ks) is used to scale the depression of transpiration due to water deficit. Stomata closure is represented in the Penman-Monteith combination equation by an increase in bulk surface resistance (Jensen and Allen 2016; Ortega-Farias et al 2006)
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