国立研究開発法人 国際農林水産業研究センター | JIRCAS

Monitoring Electrical Conductivity and Nitrate Concentrations in an Andisol Field Using Time Domain Reflectometry

JARQ : Japan Agricultural Research Quarterly
ISSN
00213551
書誌レコードID(総合目録DB)
AA0068709X
本文フルテキスト

To establish sustainable agricultural practices, monitoring soil water and solute distributions in actual field conditions is important. Because the estimation of electrical conductivity (EC) using time domain reflectometry (TDR) is considered to be affected by Andisols because of their unique dielectric properties, in this study, we investigate the potential for the continuous monitoring of EC and nitrate concentrations using TDR in an Andisol field. The study was performed from December 2007 to August 2008. To estimate soil solution EC (ECw), the relationship among ECw, apparent EC (ECa) and volumetric water content (θ) for an Andisol was investigated, and three models (Rhoades model, Extended Rhoades model and Hilhorst model) were applied to describe this relationship. The Rhoades model was found to be reasonably accurate in describing the ECw-ECa-θ relationship, while the Hilhorst model showed reasonable agreement with the experimental data. In the field experiment, ECw values estimated using TDR with the Rhoades model correlated with those obtained from solution samples and a linear regression between ECw and soil nitrate concentrations was obtained from the field experimental data. The use of this regression with ECw estimated from TDR measurements, together with the Rhoades model, is considered a useful tool for the continuous monitoring of soil nitrate concentrations in Andisol fields under transient conditions.

刊行年月2015-07-01
作成者MIYAMOTO TeruhitoKAMEYAMA KojiIWATA Yukiyoshi
著者キーワード

soil physics

solute transport

公開者Japan International Research Center for Agricultural Sciences
データ作成日2015-07-01
国立情報学研究所メタデータ主題語彙集(資源タイプ)Journal Article
49
3
開始ページ261
終了ページ267
DOI10.6090/jarq.49.261
権利Japan International Research Center for Agricultural Sciences
言語eng