Using Soil Sensors to Assess Soil Salinity

Crops & Soils Pub Date : 2024-10-31 DOI:10.1002/crso.20401
Shailesh Pandit, David E. Clay
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Abstract

This article is reproduced from Chapter 6 of the new book, Salinity and Sodicity: A Growing Global Challenge to Food Security, Environmental Quality and Soil Resilience, in a slightly modified form. The book is available for purchase from Wiley.com or Amazon.com. The article covers the use of electromagnetic (EM) sensors for measuring apparent electrical conductivity (ECa). In the field, electrical conductivity (EC) can be measured by two primary approaches: physical contact and electromagnetic (EM) induction. With physical contact, a current is injected into the soil, and the detector measures the resulting voltage. An EM meter does not make direct contact but uses a coil to produce an EM field. A sensor then measures the soil-induced changes to the original EM field. Both types of sensors measure the ECa, which is different from laboratory-derived EC values. When using ECa sensors, it is important to remember that they are sensitive to many factors, including salinity, soil moisture, bulk density, soil texture, and temperature. The purpose of this article is to provide an overview on the use of EM sensors to provide examples on the use of these sensors in the field. Earn 1.5 CEUs in Soil & Water Management by reading this article and taking the quiz at https://web.sciencesocieties.org/Learning-Center/Courses.

使用土壤传感器评估土壤盐度
本文转载自新书《盐度和钠度》第 6 章:对粮食安全、环境质量和土壤恢复能力的日益严峻的全球挑战》一书的第 6 章,略有改动。该书可从 Wiley.com 或 Amazon.com 购买。这篇文章介绍了使用电磁(EM)传感器测量表观电导率(ECa)的方法。在现场,可以通过两种主要方法测量导电率 (EC):物理接触和电磁感应。物理接触法是向土壤中注入电流,探测器测量由此产生的电压。电磁测量仪不直接接触,而是利用线圈产生电磁场。然后,传感器测量由土壤引起的原始电磁场的变化。这两种传感器测量的导电率都不同于实验室得出的导电率值。在使用 ECa 传感器时,一定要记住它们对许多因素都很敏感,包括盐度、土壤湿度、容重、土壤质地和温度。本文旨在概述电磁传感器的使用,并提供在现场使用这些传感器的示例。阅读本文并参加 https://web.sciencesocieties.org/Learning-Center/Courses 网站上的测验,即可获得 1.5 个土壤与水管理 CEU。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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