Dielectric-Based versus Gravimetrically Measured Water Content in Relations to Texture and Organic Carbon of Highland Soils

Hermawan, Bandi and Agustian, Indra and Murcitro, B.G and Sukisno, Sukisno (2017) Dielectric-Based versus Gravimetrically Measured Water Content in Relations to Texture and Organic Carbon of Highland Soils. In: The International Conference-Sustainable Agriculture, Food and Energy (SAFE2017), 21-24 August 2017, Shah Alam-Malaysia. (Unpublished)

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Abstract

Abstract— This study aimed to determine relations between texture and organic carbon to the water content measured using the field and laboratory methods for highland soils in Sumatera, Indonesia. Five locations covered with different annual crops were selected for the measurements of actual soil water content and the sample collections for the laboratory analyses. Soil water content was first determined in situ by measuring the electrical impedance Z (in kΩ) using a portable impedance meter and converting the data into soil water content θ (g.g-1) according to the following equation: θ = a.Zb where a = 0.45 and b = -0.15. A soil sample was then taken from the same point and soil depth of the dielectric measurement, put tightly in the plastic bag and brought to the laboratory for the analyses of field soil water content, texture, and carbon organic. The measurement and sampling were repeated at ten points for each location; therefore there were 50 pairs of data collected in this study. Results showed that the actual soil water content in the field was related more closely to the clay fraction rather than to sand, silt and carbon organic contents. The dielectric-based predicted were consistently lower than the gravimetrically measured values of soil water content, therefore further studies were required to improve the accuracy of the proposed instrument. Keywords— electrical impedance; gravimetric water content; organic carbon; texture.

Item Type: Conference or Workshop Item (Paper)
Subjects: S Agriculture > S Agriculture (General)
Divisions: Faculty of Agriculture > Department of Soil Science
Depositing User: Mr. Bandi Hermawan
Date Deposited: 02 Jun 2020 09:52
Last Modified: 02 Jun 2020 09:56
URI: http://repository.unib.ac.id/id/eprint/21185

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