000226518 001__ 226518
000226518 005__ 20190722163233.0
000226518 037__ $$aSTUDENT
000226518 245__ $$aOptimization of drip irrigation using a sensor network in Sahel Region (Burkina Faso) - Analysis of soil water and plant dynamics in the framework of project Info4Dourou 2.0
000226518 269__ $$a2015
000226518 260__ $$c2015
000226518 336__ $$aStudent Projects
000226518 520__ $$aThe research project Info4Dourou 2.0 's main goal is to improve agriculture in semi-arid regions by developing a support system that optimizes agricultural production and water consumption based on continuous soil humidity measurements using a sensor network. In this context, the main purpose of the study was to give more scientific support to the agronomic model on which the sensor network is based. In particular the research aims at understanding the soil water and plant dynamics in order to give recommendations on the system design. The main feature of the system is to indicate when irrigation must be triggered and in which soil moisture conditions. The thesis developed a numerical model based on the software HYDRUS 2D to acquire a precise knowledge on the soil water dynamics and was calibrated and coupled with field experiments on two vegetable crops of eggplant and cabbage in Burkina Faso using drip kit irrigation systems. A great focus was given on the plant response to different irrigation schedules and to water stress, considering aerial biomass development, root distribution and final yields. Water stress was linked to continuous measurements of the soil matrix potential at different depth and locations. The field experiments showed that a daily irrigation frequency resulted to better canopy development during the first part of the growth but that great water savings are possible by optimizing the schedule. Water stress was difficult to track precisely by following daily sap flow behaviour which suggested that plant stress occurs before transpiration reduction, especially when biomass is building up. The adaptability of the root distribution was demonstrated and was clearly correlated with the wetted zone which depended on the irrigation schedule. From the numerical model, it was shown that using one sensor at a depth of about 10 cm was most appropriate in order to pilot irrigation during the whole crop growth. The analysis showed that most of the water savings could be achieved at relatively high threshold values and that low thresholds mainly resulted to transpiration reduction which was not advisable. A threshold of -20 kPa was proposed for the beginning of the growth stage which then decreases to a value of -50 kPa at full canopy development. These thresholds are believed to be adequate for most vegetable crops since they allow keeping the soil matrix potential in the root zone at values that are tolerated by most plants. An analysis of the influence of the soil texture also showed that similar values seem to perform well for most soils, if assuming an adaptation of the root distribution to the wetted zone. The study focused mainly on water stress but more research could be done on the impact of the irrigation system on nutrients availability for example.
000226518 6531_ $$aInfo4Dourou2.0 Burkina Faso
000226518 6531_ $$aBurkina Faso
000226518 6531_ $$atriggered drip irrigation
000226518 6531_ $$asensor network
000226518 6531_ $$asoil water and plant dynamics
000226518 6531_ $$aSemi-arid regions
000226518 6531_ $$aIrrigation water management
000226518 6531_ $$aSoil water modeling
000226518 6531_ $$aEggplant
000226518 6531_ $$aSoil matric potential threshold
000226518 700__ $$aMüller, Tom
000226518 720_2 $$aPerona, Paolo$$edir.$$g174097$$0243964
000226518 8564_ $$zn/a$$yn/a$$uhttps://infoscience.epfl.ch/record/226518/files/Master_thesis_Muller.pdf$$s8376772
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000226518 917Z8 $$x238265
000226518 937__ $$aEPFL-STUDENT-226518
000226518 973__ $$aEPFL
000226518 980__ $$bMASTERS$$aSTUDENT