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Densification des sols sableux sous culture mécanisée : cas du Nord-Est Thaïlandais

Abstract : The thesis focuses on sandy soils of Northeast Thailand. A compact and resistant layer developed at low depth is a main constraint for agriculture. The thesis follows a sequence of studies that investigates (i) the physical properties of these soils in various situation natural or cultivated, (ii) the main mechanisms explaining the different physical states recorded and (iii) the research of methods for rehabilitation of damaged soils. Results highlighted the aeolian origin of the soils. This origin gives them a striking textural homogeneity and unique mechanical characteristics. Very sensitive to compaction, they collapse at low water content and under low mechanical pressure. Conventional tillage practices are not suitable as they induce structural instability. However alternative techniques as slotting or biological drilling are efficient.
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Submitted on : Thursday, March 29, 2018 - 11:24:21 AM
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Grégory Lesturgez. Densification des sols sableux sous culture mécanisée : cas du Nord-Est Thaïlandais. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2005. Français. ⟨NNT : 2005NAN10008⟩. ⟨tel-01748088⟩



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