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Transient Detection of Soil Water Content and Mechanical Resistance by a Horizontal Pentrometer Combined with an Impedance Sensor

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

Citation:  2007 ASAE Annual Meeting  071007.(doi:10.13031/2013.23083)
Authors:   P Schulze Lammers, Y Sun, D Ma
Keywords:   Soil compaction, Water content, Penetrometer, On-the-go measurement

In order to evaluate larger areas of fields and for mapping of instant soil conditions a combined horizontal penetrometer was designed for the on-the-go and simultaneous measurement of soil water content and mechanical resistance. The maximum sampling rate for both sensors was 10 Hz and the maximum operating depth was 20 cm. For the water content sensor, an impedance principle based on the effect of the fringe field capacitance was used. Four experiments were carried out in the field. These experiments included: soil water content profiles test, soil compaction measurement test, effect of the operating velocity on the water content and resistant force measurement, effect of operating depth on the force measurement. The experimental results showed that the combined horizontal penetrometer responses to changing soil conditions –compaction and water content- and the design provides a low and compensable impact of the operation depth and velocity. Thus the penetrometer is a promising tool since it can provide more useful information on soil physical conditions (e.g. traficability).

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