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Subsurface Drainage of Valley Bottom Irrigated Rice Schemes in Tropical Savannah - Case Studies of Tiefora and Moussodougou in Burkina Faso (Paperback)
Loot Price: R1,076
Discovery Miles 10 760
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Subsurface Drainage of Valley Bottom Irrigated Rice Schemes in Tropical Savannah - Case Studies of Tiefora and Moussodougou in Burkina Faso (Paperback)
Series: IHE Delft PhD Thesis Series
Expected to ship within 12 - 17 working days
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Total price: R1,096
Discovery Miles: 10 960
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This study was built to investigate the impact of subsurface
drainage on iron toxicity in Tropical Savannah irrigated rice
valley bottoms. The research leaned upon two complementary
approaches: field investigations and designed experiments.
Important results, covering several fields, where achieved. For
example, It appeared that single-season irrigation schemes present
higher iron toxicity and acidity risks than double-season ones -
750 up to 1800 mg/l of Fe2+ higher in the single-season scheme of
Moussodougou than in the double-season scheme of Tiefora.
Furthermore, a statistical analysis of flow time series (ARIMA
model) data was performed. It showed that with a simple water level
measurement probe installed at the main gate of the scheme, it
becomes possible not only to quantify irrigation water consumption,
but also to diagnose farmers' irrigation schedule, providing them a
means to defuse potential conflicts due to inequity in water
distribution. Finally, it was shown that subsurface drainage
increases ferrous iron concentration in hematite dominant soils
soil - from 935 mg/l to more than 1106 mg/l in the case of the soil
of Moussodougou - but also fortunately alleviate soil acidity -
from pH 5.6 to 7.3 in Moussodougou. This effect will eventually
reduce ferrous iron intake by rice roots, alleviating toxicity.
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