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Acoustic Compaction Layer Detection

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  021089,  2002 ASAE Annual Meeting . (doi: 10.13031/2013.9682) @2002
Authors:   M.Z. Tekeste, T.E. Grift, R.L. Raper
Keywords:   Precision Tillage, Hardpan, Soil Compaction, Fourier, Subsoiler

In order to study the dynamics of variation in three-dimensional soil surface caused by water erosion, a new system equipped with an automated photogrammetry was developed in our laboratory. The system consists of two digital cameras, a rain simulator with a twelve meters high tower, and a set of computer image analysis program of three-dimensional algorithm. The system was tested using soil boxes where soils were packed with a 10o slope and under conditions of (1) rainfall, (2) surface water flow, (3) the combination of both rainfall and surface flows and (4) intermittent surface flow. The measurement error of the system was evaluated using standard deviation (SD) between the depth of soil erosion due to measurement and analysis. The average SD was 2.8 mm for a clay soil and 2.0 mm for a sandy loam soil under rainfall conditions. The SD was reduced to 1.9 mm in a heavy clay soil under intermittent surface flow condition. The measuring error was affected by the light halation, as well as soil color, amount of water stored on the soil surface.

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