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Subsurface Drainage of Valley Bottom Irrigated Rice Schemes in Tropical Savannah
Af: Amadou Keita Engelsk Hardback
SPAR
kr 212
Subsurface Drainage of Valley Bottom Irrigated Rice Schemes in Tropical Savannah
Af: Amadou Keita Engelsk Hardback

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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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.

Produktdetaljer
Sprog: Engelsk
Sider: 222
ISBN-13: 9781138381643
Indbinding: Hardback
Udgave:
ISBN-10: 1138381640
Udg. Dato: 27 sep 2018
Længde: 0mm
Bredde: 240mm
Højde: 170mm
Oplagsdato: 27 sep 2018
Forfatter(e): Amadou Keita
Forfatter(e) Amadou Keita


Kategori Sedimentologi og pedologi


Sprog Engelsk


Indbinding Hardback


Sider 222


Udgave


Længde 0mm


Bredde 240mm


Højde 170mm


Udg. Dato 27 sep 2018


Oplagsdato 27 sep 2018

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