Improving the estimation of evaporation by the FAO-56 dual crop coefficient approach under subsurface drip irrigation

V. Phogat, J. Šimůnek, M.A. Skewes, J.W. Cox and M.G. McCarthy

Agricultural Water Management, 2016, vol. 178, issue C, 189-200

Abstract: Partitioning of evapotranspiration and estimating of irrigation contribution to evaporation play a crucial role in managing scarce water resources and help in increasing the water productivity of crops, especially of sparsely vegetated plants. In this study, the FAO-56 dual crop coefficient (DCC) approach for estimating evaporation from soil under cropped conditions is adapted for subsurface drip irrigation (SDI). This new approach involves one additional variable, the fraction of the irrigation depth contributing to evaporation (fI,Es), which was defined and integrated into the FAO-56 equations for estimating daily water balance from the evaporation layer (0–15cm). Impacts of soil texture, heterogeneity, irrigation depth, design parameters of the irrigation system on fI,Es, and the fraction of the soil surface wetted by irrigation (fw) (and consequently the exposed and wetted fraction (few)), were evaluated through HYDRUS-2D simulations. The modified procedure was compared with the existing FAO-56 method for estimating components of annual ET for wine grape under SDI.

Keywords: FAO-56 dual crop coefficient; Evaporation; Subsurface drip; Evapotranspiration; Wine grape (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (8)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:178:y:2016:i:c:p:189-200

DOI: 10.1016/j.agwat.2016.09.022

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