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Water-saving Technologies for Irrigated Rice in the Sahel

This study explores the use of water-saving technologies for irrigated rice in the Sahel region, aiming to improve production efficiency and reduce costs. The experiment examines different irrigation and weed control treatments and measures their effects on water usage, salinity levels, weed populations, plant growth, and yield components.

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Water-saving Technologies for Irrigated Rice in the Sahel

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  1. New technologies to save water for irrigated rice in the Sahel Michiel de Vries, Vincent Bado and Abdoulaye Sow Africa Rice Center (WARDA) Sahel Station - Senegal Africa Rice Congress 31 July – 4 August 2006, Dar es Salaam, Tanzania

  2. Back ground • 80% of rice production in Senegal is irrigated. • In irrigation agriculture in the SRV, water accounts for 25% of production costs • Improving water use efficiency will reduce costs and improve production efficiency • Water-less or aerobic rice can save water (Bouman et al. 2005 a, b), and is grown under saturated soil conditions, • without standing water and without water stress. Introduction

  3. Problem definition • Hypothesis: “Water-less rice can be beneficial for farmers is the Senegal River Valley” • Issues to be addressed: • Salinity and high temperatures may be a problem in the Sahel • Weeds may form an important constraint • Genetic material needs to be adapted to new conditions • Yield levels • To this end an on-station experiment was done Introduction

  4. Treatments • Irrigation treatments: (main plot) • Completely aerobic; • Aerobic until PI, then flooded; • Flooded until PI, then aerobic and • Completely flooded • Weed control treatments: (sub-plot) • Herbicide applied at 21 DAS; • Herbicide applied at 35 DAS and • no herbicide Methods

  5. Measurements • Measurements taken • Volume water irrigated • Water and salinity level in plots • Weed population • Plant growth data • Yield components Methods

  6. Plot water level Results

  7. Flood water salinity Threshold value 3.5 mS/cm Results

  8. Volume water applied Results

  9. Effects of water treatment Results Same letters are not different according to LSD, α=0.05

  10. Effects of Herbicide treatment Results Same letters are not different according to LSD, α=0.05

  11. Water x Herbicide interaction Results Same letters are not different according to LSD, α=0.05

  12. Conclusion • Under complete aerobic: 25% yield loss compared to flooded, 40% water saving • Under flooded-aerobic system no sig. yield loss, 34% water saving • Strong herbicide x water treatment interaction • Opportunities to save on water! Conclusion

  13. Next steps • On-station: • In-depth research N x Weed reactions on irrigation • Varietal screening of 42 advanced lines (20 NERICAs) • On-farm: • Collaboration with National partners • Sites along Senegal River • Socio-economic study Conclusion

  14. Thank you, Merci, Dieuredieuf, Asante sana ! Special thanks for technical assistance to: Mandieye Top, Gougna Gaye & Malick Sarr

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