Objective
- Calibration of formulas for the estimation of evapotranspiration for the desertic conditions in North Africa;
- Determination of crop coefficients for a multiple level crop canopy as practised in the oasis;
- Elaboration of models for dimensioning surface irrigation systems under oasis conditions;
- Salt balance studies in the oasis.
Results
- Results have led to reasonable indications on crop coefficients for the different agricultural systems in the oasis. These results have been presented to development agencies in Tunisia during a 1 day seminar. The proceedings of this seminar will be available from December 1997. The improved understanding will provide a better decision basis for water management.
- Two research protocols for the project have been defined : evapotranspiration and crop coefficients and water management. The salt balance and drainage protocol is still in a preparatory stage.
- In Tunisia as well as in Morocco, data collection for the determination of evapotranspiration and crop coefficients has started and first results have led to some knowledge about the consumptive use of the multiple level crop canopy. Soil moisture and sapflow equipment has been tested thoroughly and testing results have led to an understanding of the transpiration behaviour of the separate crops.
- Two oases for the study of water management at oasis and plot level have been selected in Tunisia and presently research is ongoing. No results have been produced so far.
- The developed package of models will provide a tool for water managers to apply the generated knowledge to their advantage.
- Overall it is expected that the project will contribute to a more efficient use of the scarce water resources of the oasis in North Africa.
- The work is conducted on two sites in Tunisia and one site in Morocco where surface irrigation is represented by basin techniques on sandy soil;
- Assessment of crop water requirements by measurements of water retention and transpiration at a level where hydrological stress is avoided;
- Determination of the consumptive use in a hydrological parcel, serving as experimental plot, through the direct measurement of water content and controlled inflow;
- Calculation of the potential evapotranspiration (ETP) as a function of climatic parameters applying the Penman-Monteith formula. The formula for the ETP calculation in the oasis will be calibrated by measuring ETP inside and outside the oasis;
- Calculating global crop coefficients from water consumption and ETP;
- Assessment of the salt balance of the irrigation and drainage water through direct measurement of the electrical conductivity;
- Modelling of surface irrigation techniques for oasis conditions;
- Design of a monitoring and irrigation system on the basis of the developed package with particular emphasis on an adequate allocation of water to the individual parcels as well as to the appropriate management at the level of the parcel.
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Programme(s)
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Funding scheme (or “Type of Action”) inside a programme with common features. It specifies: the scope of what is funded; the reimbursement rate; specific evaluation criteria to qualify for funding; and the use of simplified forms of costs like lump sums.
Coordinator
6709 PA WAGENINGEN
Netherlands
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.