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Article Dans Une Revue Soil Science Society of America Journal Année : 2011

Vertical and lateral variations of soil immobile water fraction in two tillage systems

Résumé

A better understanding of water and solute movement in soils is crucial to limit the environmental impact of agricultural practices. Th e objective of this study was to compare preferential fl ow in soil due to mobile-immobile water partitioning at various depths in two tillage systems. Since 2000, an agricultural fi eld has been divided into two plots cultivated using two tillage systems: conventional tillage with moldboard plowing (CT) and conservation tillage with disk harrowing (MT). Th e hydraulic conductivity at −1-cm matric head, K−1, and the immobile water content of diff erent soil compartments identifi ed with a morphological description in each tillage system were measured using tension disk infi ltrometers and a Br− tracer. Measurements were performed in 2005. A higher spatial variability of K−1 was observed in the CT plot than in the MT plot. Th e immobile water fraction at -1-cm matric head under CT ranged from 0.039 to 0.947 with a mean of 0.524 (CV = 55%). Under MT, the immobile water fraction ranged from 0.216 to 0.882 with a mean of 0.631 (CV = 30%). Soil structure variation due to plowing was found to signifi cantly infl uence the soil immobile water fraction under CT, while it was more uniform under MT at the 1-m observation scale.
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Dates et versions

hal-01019330 , version 1 (07-07-2014)

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Lionel Alletto, Yves Coquet, Pierre Vachier, Christophe Labat. Vertical and lateral variations of soil immobile water fraction in two tillage systems. Soil Science Society of America Journal, 2011, 75 (2), pp.498-508. ⟨10.2136/sssaj2010.0267⟩. ⟨hal-01019330⟩
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