Testing the Model Efficiency of HYDRUS 2D/3D Under Desert Conditions for Water Content and Pore Electrical Conductivity: a Case Study in an Olive Orchard

Faúndez Urbina Carlos, Kremer Fariña Cristian, Garrido Salinas Marco, Galleguillos Mauricio, Aponte Humberto, Honorio de Miranda Jarbas, Seguel Seguel Oscar

Research output: Contribution to journalArticlepeer-review

Abstract

The water crisis is a concern for Chilean agriculture. Testing new methods based on computer simulations is urgent to optimize irrigation. This study aimed to assess the model efficiency of HYDRUS 2D/3D simulations of volumetric water content (θ) and pore electrical conductivity (ECp) in an olive tree variety Kalamata under desert conditions. The model efficiency was assessed by comparing model simulations against observations of θ and ECp in five frequency domain reflectometry (FDR) sensors installed in the soil profile. Model simulations were improved by calibration using PEST software. Global sensitivity analysis was performed before calibration, analyzing both θ and ECp model outputs. Outcomes of sensitivity analysis indicate that the surface area associated with transpiration (ST) and the slope of the stress response function (s) are relevant parameters for θ and ECp. Both parameters were calibrated along with the saturated water content (θs) and pore size distribution (n) parameters of the second material. Calibration improved HYDRUS 2D/3D simulations for θ but not substantially for ECp. However, the Nash–Sutcliffe and the root mean square error (RMSE) are comparable with previous research for both variables. Furthermore, the s parameter decreases after calibration, indicating that Kalamata variety is tolerant to salt, which is in line with previous research. HYDRUS 2D/3D represents the θ variation in time and space with acceptable precision for olive trees under desert conditions. Additionally, subsequent studies should focus on the value of s, which is variety dependent, and ST, which requires the actual root volume.

Original languageEnglish
Pages (from-to)1859-1872
Number of pages14
JournalJournal of Soil Science and Plant Nutrition
Volume22
Issue number2
DOIs
StatePublished - Jun 2022
Externally publishedYes

Keywords

  • Arid conditions
  • Eco-hydrology
  • Salinity
  • Stress response parameters
  • Surface area associated with transpiration

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