Agricultural and Biosystems Engineering Publications

Document Type

Article

Publication Date

9-12-2012

Journal or Book Title

Soil Science Society of America Journal

Volume

76

Issue

5

First Page

1536

Last Page

1547

Research Focus Area(s)

Land and Water Resources Engineering

DOI

10.2136/sssaj2011.0391

Abstract

Fast and reliable methods for in situ monitoring of soil NO3–N concentration could help guide efforts to reduce NO3–N losses to ground and surface waters from agricultural systems. While several studies have been done to indirectly estimate NO3–N concentrations from time domain spectra, no research has been conducted using a frequency domain technique. Hence, the goal of this laboratory study was to estimate NO3–N concentrations from frequency-response data obtained in a frequency range of 5 Hz to 13 MHz. Dielectric spectra of soil samples wetted to five different volumetric water contents (VWC) with 24 solutions containing different concentrations of KNO3 and KCl were analyzed using a partial least squares (PLS) regression method. Global models could not estimate NO3–N concentrations with sufficient accuracy. Models based on the imaginary part of the permittivity were better than those based on the real part. The PLS model estimates were improved when low VWC data and high Cl concentration were eliminated, reducing the RMSE for NO3–N from 57 to 28 mg L−1. The best results were obtained when the PLS models were constructed at fixed VWC levels using the data without high Cl concentration. The performance of these models improved with increasing VWC level, reaching the lowest RMSE of 18 mg L−1 at VWC of 0.30 m3 m−3.

Comments

This article is from Soil Science Society of America Journal 76, no. 5 (2012): 1536–1547, doi:10.2136/sssaj2011.0391.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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