The 'Brazilian Test' as an indicator of workability for paddy soils in Vietnam

W.B. Hoogmoed, V.L. Nguyen

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

Abstract

Farmers in Mekong delta prefer to till their soil in dry conditions when possible. They claim that crops establish and yield better when the field have been ploughed when dry compared to the wet preparation by puddling. Experiments were carried out to investigate the optimum workabilty range for the soils (heavy clay soils without any sand) in the area. A simple laboratory test procedure to serve as an alternative to field testing was developed. The test assesses the behaviour of soil under compressive forces. Soil aggregates from 5 different soils in the area were compressed into small discs at various mosture content levels and aggregate size classes. After drying, the tensile strength of the discs was determined using the “Brazilian test”. It was found that the strength of the discs was strongly dependent on moisture content at compaction, aggregate size and compressive force, but also the organic matter content of the soils played an important role. The Brazilian test provided useful information with respect to soil behaviour under tillage, in addition to the field tests.
Original languageEnglish
Title of host publicationProceedings of the 17th International Conference of ISTRO, Kiel, Germany, August 28th - Sept. 3rd. 2006
PublisherInternational Soil Tillage Research Organization
Pages1166-1171
Publication statusPublished - 2006
Event17th International Conference of ISTRO "Sustainability - its Impact on Soil Management and Environment" -
Duration: 28 Aug 20063 Sep 2006

Conference

Conference17th International Conference of ISTRO "Sustainability - its Impact on Soil Management and Environment"
Period28/08/063/09/06

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