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Influence of plant, soil, and water on the leaching fraction
Year:
2008
Source of publication :
Vadose Zone Journal
Authors :
Ben-Gal, Alon
;
.
Volume :
7
Co-Authors:
Dudley, L.M., Dep. of Geological Science, Florida State Univ., Tallahassee FL 32306-4100, United States
Ben-Gal, A., Environmental Physics and Irrigation, Agricultural Research Organization, Gilat Research Center, D.N. Negev 85280, Israel
Shani, U., Dep. of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Facilitators :
From page:
420
To page:
425
(
Total pages:
6
)
Abstract:
Reducing the amount of drainage water that contains salts, nutrients, and trace elements may reduce environmental contamination to groundwater by reducing the dissolution of trace-element-containing minerals, maximizing chemical precipitation of salts, and improving nutrient uptake efficiency. If salt accumulates, transpiration and yield will decrease and some fraction of the irrigation water will not be extracted by roots, subsequently becoming drainage. We modeled yield and salt and water budgets under conditions of extended irrigation with poor quality water in amounts ranging from 0.6 to 1.6 times the ratio of irrigation (I) to reference evaporation (E0). The surface boundary conditions were taken from a field experiment where melon (Cucumis melo ssp. melo cv. Galia) was irrigated with waters of electrical conductivities of 1.2, 3, 6, and 9 dS/m at I/E 0 = 1.0 for a growing season (1152 h). The model contained one-dimensional solutions to Richards' equation with a root-sink term and the equation of continuity for salt transport. Solutes were treated conservatively. For any given salinity value, the leaching fraction had a minimum value corresponding to the irrigation level where a minimum amount of water was used to control salinity and those minimum values were 0.11, 0.24, 0.44, and 0.54 for salinity levels 1.2, 3, 6, and 9 dS/m. Yield reduction for these irrigation levels were 80, 70, 60, and 40% of maximum possible yields, suggesting an economic price to minimizing drainage and further suggesting that plant-irrigation-drainage relationships are highly self-regulating. © Soil Science Society of America. All rights reserved.
Note:
Related Files :
Cucumis melo
drainage water
Economic Analysis
irrigation system
Richards equation
salinity
trace element
transpiration
Show More
Related Content
More details
DOI :
10.2136/vzj2007.0103
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
29186
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:44
Scientific Publication
Influence of plant, soil, and water on the leaching fraction
7
Dudley, L.M., Dep. of Geological Science, Florida State Univ., Tallahassee FL 32306-4100, United States
Ben-Gal, A., Environmental Physics and Irrigation, Agricultural Research Organization, Gilat Research Center, D.N. Negev 85280, Israel
Shani, U., Dep. of Soil and Water Sciences, Faculty of Agricultural, Food and Environmental Sciences, Hebrew Univ. of Jerusalem, P.O. Box 12, Rehovot 76100, Israel
Influence of plant, soil, and water on the leaching fraction
Reducing the amount of drainage water that contains salts, nutrients, and trace elements may reduce environmental contamination to groundwater by reducing the dissolution of trace-element-containing minerals, maximizing chemical precipitation of salts, and improving nutrient uptake efficiency. If salt accumulates, transpiration and yield will decrease and some fraction of the irrigation water will not be extracted by roots, subsequently becoming drainage. We modeled yield and salt and water budgets under conditions of extended irrigation with poor quality water in amounts ranging from 0.6 to 1.6 times the ratio of irrigation (I) to reference evaporation (E0). The surface boundary conditions were taken from a field experiment where melon (Cucumis melo ssp. melo cv. Galia) was irrigated with waters of electrical conductivities of 1.2, 3, 6, and 9 dS/m at I/E 0 = 1.0 for a growing season (1152 h). The model contained one-dimensional solutions to Richards' equation with a root-sink term and the equation of continuity for salt transport. Solutes were treated conservatively. For any given salinity value, the leaching fraction had a minimum value corresponding to the irrigation level where a minimum amount of water was used to control salinity and those minimum values were 0.11, 0.24, 0.44, and 0.54 for salinity levels 1.2, 3, 6, and 9 dS/m. Yield reduction for these irrigation levels were 80, 70, 60, and 40% of maximum possible yields, suggesting an economic price to minimizing drainage and further suggesting that plant-irrigation-drainage relationships are highly self-regulating. © Soil Science Society of America. All rights reserved.
Scientific Publication
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