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פותח על ידי קלירמאש פתרונות בע"מ -
Water uptake, active root volume, and solute leaching under drip irrigation: A numerical study -2009
Year:
2009
Source of publication :
Water Resources Research
Authors :
אסולין, שמואל
;
.
זילבר, אבנר
;
.
לאופר, אשר
;
.
רוסו, דוד
;
.
Volume :
45
Co-Authors:
Facilitators :
From page:
0
To page:
0
(
Total pages:
1
)
Abstract:
The use of saline water for irrigation is based on the concept that increasing irrigation water quantity may offset in part the negative effects associated with higher salinity. The main goals of this paper were (1) to investigate the impact of the controllable variables, the relative quantity (Qr), and the quality (C0) of the irrigation water on water uptake, active root volume, and solute leaching under daily drip irrigation in fine (clay) and coarse (sandy) textured soils; (2) to test the hypothesis that the reduced active root zone associated with salt accumulation may further reduce water uptake by plant roots; and (3) to assess consequences of using (C0-Qr) substitutions based on the FAO recommendations on salinity control with respect to agricultural and environmental aspects. Novel findings of this study suggest that in the clay soil mean water extraction rate, Sw is quite robust to C 0-Qr substitutions, and the decrease in transpiration, T, induced by increasing C0 is mainly due to the decrease in the soil volume providing most (90%) of the root water uptake, Vs. In contrast, in the sandy soil, Vs may increase with C0-Qr substitutions, and the decrease in T is mainly due to the decrease in Sw, induced by osmotic pressure head reduction. Consequently, in the clay soil, a simultaneous increase of Qr and C0 based on the FAO substitution curve may lead to an increase in root uptake efficiency, T/Vs, while it may cause the opposite effect in the sandy soil. Furthermore, compensation for the adverse effects of increasing C0 on relative transpiration, Tr, by C0-Qr substitutions is more efficient in the clay soil than in the sandy soil. The C0-Qr substitution approach may lead to an increase in the salt load leached below the root zone, thus increasing the potential for polluting groundwater resources. Results of the present study suggest that for both soils, from both agricultural and, particularly, environmental points of view, irrigation with high-quality water which may comply with economical criteria is desirable. Copyright 2009 by the American Geophysical Union.
Note:
Related Files :
drip irrigation
High quality water
irrigation
Root volume
sandy soils
Soil volume
transpiration
Water uptake
עוד תגיות
תוכן קשור
More details
DOI :
10.1029/2009WR008015
Article number:
0
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
25298
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:13
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Scientific Publication
Water uptake, active root volume, and solute leaching under drip irrigation: A numerical study -2009
45
Water uptake, active root volume, and solute leaching under drip irrigation: A numerical study
The use of saline water for irrigation is based on the concept that increasing irrigation water quantity may offset in part the negative effects associated with higher salinity. The main goals of this paper were (1) to investigate the impact of the controllable variables, the relative quantity (Qr), and the quality (C0) of the irrigation water on water uptake, active root volume, and solute leaching under daily drip irrigation in fine (clay) and coarse (sandy) textured soils; (2) to test the hypothesis that the reduced active root zone associated with salt accumulation may further reduce water uptake by plant roots; and (3) to assess consequences of using (C0-Qr) substitutions based on the FAO recommendations on salinity control with respect to agricultural and environmental aspects. Novel findings of this study suggest that in the clay soil mean water extraction rate, Sw is quite robust to C 0-Qr substitutions, and the decrease in transpiration, T, induced by increasing C0 is mainly due to the decrease in the soil volume providing most (90%) of the root water uptake, Vs. In contrast, in the sandy soil, Vs may increase with C0-Qr substitutions, and the decrease in T is mainly due to the decrease in Sw, induced by osmotic pressure head reduction. Consequently, in the clay soil, a simultaneous increase of Qr and C0 based on the FAO substitution curve may lead to an increase in root uptake efficiency, T/Vs, while it may cause the opposite effect in the sandy soil. Furthermore, compensation for the adverse effects of increasing C0 on relative transpiration, Tr, by C0-Qr substitutions is more efficient in the clay soil than in the sandy soil. The C0-Qr substitution approach may lead to an increase in the salt load leached below the root zone, thus increasing the potential for polluting groundwater resources. Results of the present study suggest that for both soils, from both agricultural and, particularly, environmental points of view, irrigation with high-quality water which may comply with economical criteria is desirable. Copyright 2009 by the American Geophysical Union.
Scientific Publication
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