Comparison of water distribution mechanisms under two localized irrigation techniques (Drip Irrigation & Buried Diffuser) for one week irrigation period in a sandy soil of southeastern Tunisia
EGU2017-8489
Ines Gasmi (1), Radka Kodešová (2), Mohamed Mechergui (3), Antonín Nikodem (2), and Mohamed Moussa (1) (1) Dept. of Eremology and Combating Desertification,Institute of Arid Regions, Medenine,Tunisia (
[email protected]), (2) Dept. of Soil Science and Soil Protection, Czech University of Life Sciences, Prague, Czech Republic, (3) Dept. of Agricultural Engineering Waters and Forests, National Agronomic Institute of Tunisia, Tunis, Tunisia
Introduction
Buried Diffuser
Results & discussion
Arid climate Water deficit
Limited water resources
Human consumption exceeds available hydrological resources
Rarity of rain makes impossible to practice rain-fed agriculture
- Drip irrigation: period of 7 days, 100% applied dose (230 mm)
- Buried diffuser: period of 7 days, 100% applied dose ( 230 mm) SWC (cm3/cm3) 0.00
Increase Productivity
Improving Soil Quality
Preserving water resources
Protecting resources against climate change vulnerability
0.20
0.30
0.40
0.50
0.00
0.00
0.00
10.00
10.00
20.00
20.00
Depth (cm)
Depth (cm)
Use of new irrigation techniques
0.10
SWC (cm3/cm3)
30.00 40.00
70.00 th, t=30
th, t=180
th, t=2880
- Drip irrigation: period of 7 days, 50% applied dose (115 mm)
th, t=5
- Buried diffuser: period of 7 days, 50% applied dose ( 115 mm)
Irrigation) to identify the technique that ensure the best water distribution and promotes the propagation of the root zone with a
0.10
0.20
0.30
0.40
0.00
0.50
50.00
th, t=30
th, t=180
th, t=720
Buried diffuser is a new technique for localized subsurface
0.10
0.20
0.30
0.40
0.20
0.30
0.40
30.00
Conclusion
40.00 50.00 70.00 th, t=5
th, t=30
th, t=180
th, t=30
th, t=180
th, t=14400
th, t=2880
- Buried diffuser: period of 10 days, 50% applied dose ( 115 mm) SWC (cm3/cm3)
0.00
0.10
0.20
0.30
0.40
0.00
0.50
0.10
0.20
0.30
0.40
10.00
Depth (cm)
5.00 10.00 15.00 20.00 25.00
ϴcc=0.15
RESEARCH POSTER PRESENTATION DESIGN © 2015
www.PosterPresentations.com
ϴs=0.42
and ϴr=0.09
-
Most important irrigation efficiency,
-
Less loss of irrigation water by evaporation and by infiltration.
40.00
50.00
Acknowledgement
70.00
35.00
th, t=5 th, t=30
th, t=180
th, t=30
th, t=180
th, t=14400
th, t=720
The soil hydraulic parameters have been determined in the laboratory of
Hydrus code. -
Conservation of water for a longer time in the soil depth,
30.00
Irrigation treatments
DI 7 Days (100%)
DI 7 Days (50%)
DI 10 Days (100%)
DI 10 Days (50%)
BD 7 Days (100%)
BD 7 Days (50%)
BD 10 Days (100%)
BD 10 Days (50%)
Final stock (mm)
9.45
5.6
4.8
1.5
18.2
7.6
10.8
8.4
Stock provided by irrigation (mm)
62.1
33.6
78.3
31.9
97.2
85.8
118.8
79.2
obtained for different times and the dynamic profile presented by
cm3/cm3
-
20.00
60.00
30.00
Advantages of the Buried diffuser on the Drip Irrigation technique:
0.50
0.00
0.00
th, t=5
The interpretation is based on the profiles of soil water content
cm3/cm3;
0.50
60.00
- Drip irrigation: period of 10 days, 50% applied dose (115 mm)
Depth (cm)
0.10
20.00
SWC (cm3/cm3)
-
conservation in arid Zones.
10.00
th, t=5
an irrigation period varied from 7 to 10 days.
irrigation, patented at the Institute of Arid Regions, Medenine-
0.00
50.00
same flow rate (4l/h) of complete and half irrigation dose and of
th, t=10080
Tunisia; this technique allows the optimization of use and water 0.00
0.50
40.00
Those cases are; Drip Irrigation and Buried Diffuser with the
th, t=180
SWC (cm3/cm3)
30.00
profile and its period is depending on the condition of each case.
th, t=30
- Buried diffuser: period of 10 days, 100% applied dose ( 230 mm)
Depth (cm)
Depth (cm)
Installed Buried Diffuser for vegetables (www.chahtech.com)
th, t=5
20.00
complete the evaluation of the applied water, we added a fourth
0.50
70.00
10.00
only are presented three profiles of t=5; 30 and 180min. To
0.40
40.00
60.00
Simulation of irrigation was conducted for 3 hour duration and
0.30
30.00
0.00
using Hydrus 1D.
0.20
60.00
0.00
Soil hydraulic parameters were simulated by inverse modeling
0.10
20.00
SWC (cm3/cm3)
using Tempe cells method.
th, t=10080
10.00
- Drip irrigation: period of 10 days, 100% applied dose (230 mm)
40-60cm) for the determination of the SWRC that measured by
th, t=180
0.00
0.00 5.00 10.00 15.00 20.00 25.00 30.00 35.00 40.00 th, t=5
Soil samples were taken from three horizons (0-20, 20-40 and
th, t=30
SWC (cm3/cm3)
Depth (cm)
Depth (cm)
under two localized irrigation techniques (Buried Diffuser & Drip
-
0.50
60.00
th, t=5
In this study, we simulated using Hydrus 2D/3D the water flow
-
0.40
50.00
60.00
0.00
-
0.30
40.00
SWC (cm3/cm3)
Methods
0.20
30.00
50.00
Objectives
better saving of water resources.
0.10
cm3/cm3
Stock of water left under the root zone (%) Irrigation efficiency (%)
Soil Science and Soil Protection, Czech university of life sciences, Prague, Czech Republic, and this project funded by the Insitute of Arid Regions, Medenine,Tunisia
15
16
6
4.7
18.7
8.8
9
10.6
85
84
94
95.3
81.3
91.2
91
89.4
