NENA REGIONAL STAKEHOLDERS WORKSHOP
on
Operationalizing the Regional Collaborative Platform to address water consumption, water productivity and drought management in
Agriculture
Session II: Crop Water Productivity
Case Study Tunisia,
Nabil Sghaier
October 27-29, 2015, Cairo Egypt
Major agricultural systems in Tunisia
• Rainfed agricultural areas: 4 575 540 ha (18 % is fallow),
• Mixed irrigated areas: 415 900 ha,
• Rangeland: 4 798 540 ha
Source: ONAGRI (2012) http://www.onagri.nat.tn/statistiques
Major crops in Tunisia • Cereals (North): 1 440 180 ha (33 % of cultivated area),
• Olives (Central part and North): 1 800 000 ha (40 % of cultivated area),
• Dates (Oasis of Southern Tunisia): 22 500 ha
• Fruit trees: 475 280 ha (11 %),
• Irrigated tree crops: 204 000 ha,
• Vegetables: 160 280 ha
Source: ONAGRI (2012) http://www.onagri.nat.tn/statistiques
Methods used by the Ministry of Agriculture to monitor crop yield
- Objective method at governorate level: field sampling+extrapolation
method (statistical department of MA: DGEDA),
- Non objective method at delegation level: sub-governorate (in-situ
visit of farmers and visual expertise (Agricultural production
department of MA: DGPA)
Agencies of the Ministry of Agriculture which are involved with CWP
• Agriculture Production Department (DGPA), National Institute of Field Crops (INGC), Rural
Engineering Department (irrigation), Agricultural Research and Higher Education Institute
(IRESA),..
Major on-going programs/projects for RS CWP determination
• Demonstration/research projects (WLI, ACLIMAS, IRA-project)
Methods used by the Ministry of Agriculture to monitor crop water use and evapotranspiration
• Indirect method using irrigation water accounting through
inflow/outflow of water into reservoirs, water level of reservoirs,
piezometers and water gauges in irrigation networks (GDA), crop
water requirement (FAO 56 method),
• No routine monitoring by RS, only experimental /research work
Water productivity for cereal crops in Tunisia
Yield and total water supply (P+I) at different scales
0
2
4
6
8
200 400 600 800
t/ha
Precipitation+Irrigation (october - mai ) mm
Yield and total water supply (P+I)/farmers
Ref. New Medit 1/2015
0
4
8
12
16
20
200 400 600 800
kg mm-1 ha-1
Precipitation+Irrigation (october - mai ) mm
WP and total water supply (P+I)/farmers
Ref. New Medit 1/2015
-1
0
1
2
3
4
0 4 8 12 16 20
MC
V (
Mil
le D
T/h
a)
WP (kg mm-1 ha-1)
Ref. New Medit 1/2015
Margin on variable cost and WP
1 Mille DT ≈ 500 USD
Routes for improvement and tools
15
10
Barely
20
25
0
2
4 6
8
10
12
14
Bread wheat 20
15
10
5
0 1910 1920 1930 1940 1950 1960 1970 1980 1990
1910 1920 1930 1940 1950 1960 1970 1980 1990
1910 1920 1930 1940 1950 1960 1970 1980 1990
Durum wheat
5
0
Cereal yield in Tunisia (q/ha) 1910-1997
SWIM (Sustainable Water Integrated Management) - Demonstration
Project Theme: Water and Climate Change
"European Neighborhood and Partnership (ENP) financial co-operation with Mediterranean countries“
EuropeAid/131046/C/ACT/Multi
Funded by Implemented by
Project duration December 29, 2011-December 28, 2015
Target Region Contact Person
Prof.Dr. Netij Ben Mechlia
INAT, Tunisia
E-mail:
North-Eastern Tunisia
Indicator Actual Target
Cereal Yield (q/ha) 23 32
WP for cereals (Kg/m3) 0.6 0.8
Actual and target WP for cereal in North Eastern Tunisia (Results of undergoing ACLIMAS project)
Yield, ETa, Durum Wheat, Karim variety
y = 1.35 x - 0.24
R 2 = 0.87
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
0.4 0.6 0.8 1.0 1.2
ETa / ETc
Y /
Y m
Identify areas with with high potential gain in WP (Y/ETa) in Tunisia: tools
• Yield estimation at sub-governorate level (delegation unit),
• Estimation of consumptive water use (ETa),
- ETa information is derived from RS data,
- In Tunisia, ET at spatial resolution of 375 X 375 m would be valuable (ALEXI ET),
- For higher spatial resolution for vegetables/fruit tree crops, disaggregation technique
is suggested,
- Daily ETa information,
• Better understanding of the crop yield ET relationships,
• Appropriation of the technology of RS-based ET retrieval and mapping,
• More precise data on actual yield using objective method (using delegation reporting
unit instead of governorate).
• Yield/Biomass estimation at pixel level using agrometeorological/empirical approaches.
• Crop mapping using phenological/calendar approach ,
To have an operational RS CWP in Tunisia
During this week, Prof Netij is organizing a workshop on cereal
productivity and productivity assessment and improvement
with different stakeholders from MA. So we can set up an
operational network for monitoring and technology transfer,
Thank you for your attention
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