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Selected Publications |
Reference
Spatio-temporal variability of acid sulphate soil in the plain of reeds,
Vietnam. Impact of soil properties, water management and crop husbandry on the growth and
yield of rice in relation to microtopography.
Ph.D Thesis, 1998.
Authors :
Olivier Husson
Summary :
Acid sulphate soils in the Mekong delta cover 1.6 million hectares, of
which 400000 ha are located in the Plain of Reeds. Due to the presence of pyrite that
yields acid when oxidised, all acid sulphate soils are (potentially) strongly acidic.
Reclamation of the 150000 ha of severely acid sulphates soils still uncultivated in 1990
became a national priority and now attracts local farmers and migrants. However, these
soils present important agronomic problems and farmers urgently need advice to reclaim
them. However, the development of recommendation and the cultivation of acid sulphate
soils on a large scale are made difficult by their very high variability.
The objectives of this thesis are to :
 | characterise and explain spatio-temporal variability, at various scale,
of acid-sulphate soils and water in the Plain of Reeds, Vietnam,
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| assess the impact of soil and water variability on rice cultivation,
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| develop a simple model of rice yield build-up under conditions following
land reclamation of several acid-sulphate soils in the Plain of Reeds,
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| apply this model to identify and rank limiting factors, to precisely
identify the optimal time window for cultivation and develop optimal agricultural
practices (in particular water management and fertilisation) for the main cropping
conditions found in the Plain of Reeds.
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Keywords :
Acid sulphate soils / Variability / Microtopography / Plain of Reeds /
Vietnam / Rice / Land reclamation / Yield components / Covariance analysis / Water
management / Fertilisation / On-farm research / Integrated study.
Contacts :
cirad-ca@netnam.org.vn
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