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| DOI: | 10.1016/j.agwat.2017.09.012 |
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| Web URL(s): | http://www.sciencedirect.com/science/article/pii/S0378377417303074
Last checked: 12/13/2017
Access conditions: Item is within a limited-access website |
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| Publication Type:
| Refereed |
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| Author(s): | Raij, Iael;
Ben-Gal, Alon;
Lazarovitch, Naftali |
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| Author Affiliation: | Raij and Lazarovitch: Wyler Department of Dryland Agriculture, French Associates Institute for Agriculture and Biotechnology of Drylands, The Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boqer Campus, Midreshet Ben-Gurion, Israel; Ben-Gal: Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Gilat Research Center, Israel |
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| Title: | Soil and irrigation heterogeneity effects on drainage amount and concentration in lysimeters: A numerical study |
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| Source: | Agricultural Water Management. Vol. 195, January 1 2018, p. 1-10. |
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| Publishing Information: | [Amsterdam]: Elsevier Scientific Pub. |
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| # of Pages: | 10 |
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| Keywords: | TIC Keywords: Comparisons; Drainage rate; Evaluative methods; Evapotranspiration; Hydraulic conductivity; Irrigation rates; Irrigation scheduling; Leaching fractions; Lysimeters; Molarity; Saline water; Soil uniformity; Water uptake
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| Abstract/Contents: | "Water and solute fluxes measured from lysimeters located in the field can be used to estimate evapotranspiration, for irrigation scheduling and in solute leaching management. System-imposed heterogeneities are expected to affect the variability of the measured fluxes, and therefore the uncertainty of data obtained using lysimeters. In this study, local heterogeneities in soil hydraulic conductivity and dripper discharge rate were studied and their effect on drainage amount and concentration assessed. Three-dimensional simulations were performed with HYDRUS (2D/3D) with 100 simulations per treatment. The effect of three levels of soil and irrigation heterogeneities was studied for lysimeters of two different sizes (1 m2 and 0.5 m2). Additionally, three leaching fraction levels and water uptake reduction due to solute stress were evaluated. Coefficient of variations of the drainage amount and solute concentrations were evaluated for the different scenarios. Irrigation heterogeneity caused higher variability in drainage amount while soil heterogeneity caused higher variability in drainage concentration. The larger the lysimeter, or the higher the leaching fraction, the lower the variability for both drainage concentration and amount. Combined soil and irrigation heterogeneities produced no synergistic effect, suggesting that the variability measured in lysimeters was governed by the factor that caused the highest variability. When water uptake reduction due to salinity was considered, the same trends were observed. The results from this study can help to decide if to use either drainage concentration or amount values, for saline water irrigation management using lysimeters, according to the soil or irrigation heterogeneity levels." |
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| Language: | English |
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| References: | 37 |
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| Note: | Figures
Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Raij, I., A. Ben-Gal, and N. Lazarovitch. 2018. Soil and irrigation heterogeneity effects on drainage amount and concentration in lysimeters: A numerical study. Agric. Water Manage. 195:p. 1-10. |
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| DOI: 10.1016/j.agwat.2017.09.012 |
| Web URL(s):
http://www.sciencedirect.com/science/article/pii/S0378377417303074
Last checked: 12/13/2017
Access conditions: Item is within a limited-access website |
| 
MSU catalog number: b2205878a |
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