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Nitrate Content Prediction in Soil using TDR Bulk Electrical Conductivity, Water Content, and Bulk Density Data

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

Citation:  2007 ASAE Annual Meeting  072269.(doi:10.13031/2013.23047)
Authors:   M Krishnapillai, R Sri Ranjan
Keywords:   nitrate contamination, TDR, electrical conductivity, non-destructive measurement

The high mobility of nitrate ions in soil can lead to groundwater contamination. Therefore, the nitrate concentration in soil has to be monitored to assess the extent and variation in nitrate concentration as a function of time. Nitrate concentration measurement in soil is often done by sampling the soil and analyzing it in the laboratory to estimate the nitrate concentration. This is a tedious method when a number of samples have to be analyzed. This paper presents the results of a laboratory experiment in which an effort was made to predict the nitrate solute concentration from Time Domain Reflectometry (TDR) measured bulk electrical conductivity, water content, and bulk density data of the soil.

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