Karakterisasi Tanah Sawah Akibat Pengairan Berdasarkan Sifat dan Mineral Magnetik Di Nagari Sungai Tarab dan Padang Laweh  Kecamatan Sungai Tarab

Fajar Budi Raharja; Arif Budiman

doi:10.25077/jfu.15.6.570-577.2026

Authors

Fajar Budi Raharja Departemen Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas
Arif Budiman Departemen Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Andalas

DOI:

https://doi.org/10.25077/jfu.15.6.570-577.2026

Keywords:

Black Soil, Brown Soil, Magnetic Susceptibility, X-Ray Fluorescence

Abstract

The difference in the color of paddy soil—jet black in Nagari Sungai Tarab and brown in Nagari Padang Laweh—serves as an initial indicator of variations in soil characteristics, specifically regarding mineral composition and magnetic properties. This study aims to characterize paddy soil based on its magnetic properties and oxide composition under different irrigation conditions in Nagari Sungai Tarab and Nagari Padang Laweh, located in the Sungai Tarab District, Tanah Datar Regency, West Sumatra. Soil samples were collected at a depth of 20 cm, with 10 samples taken under dry conditions and 10 under submerged (flooded) conditions at each location. Characterization was conducted by measuring low-frequency magnetic susceptibility (κ_lf) using a Bartington MS2B instrument and analyzing oxide composition via X-Ray Fluorescence (XRF). The results indicate that the mean κ_lf values in Nagari Padang Laweh are higher than those in Nagari Sungai Tarab, under both dry and submerged conditions. At both locations, the mean κ_lf values are lower under submerged conditions compared to dry conditions. The magnetic properties governing the κ_lfvalues are thought to be related to the contribution of paramagnetic and ferrimagnetic minerals within the soil. XRF analysis of selected samples reveals that Fe₂O₃ concentrations decrease under submerged conditions, and κ_lfvalues tend to increase as Fe₂O₃ concentrations rise. The observed difference in soil color—jet black in Nagari Sungai Tarab versus brown in Nagari Padang Laweh—is likely linked to variations in the characteristics of organic matter and iron oxides.Research has been conducted to characterise paddy soil due to irrigation based on the properties and magnetic minerals of the soil..

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