Real-Time Measurement of CH₄ and CO₂ Concentrations for Estimating Methane Emissions from Rice Fields

User Benefits

- The portability of this gas analyzer means the user can decide where to place it, such as near a rice field, to continuously measure CH₄ and CO₂ emissions. - The CGT-7100 analyzer unit has a built-in pump, filter, dehumidifier, and other sample pretreatment equipment, so it does not require other equipment to perform measurements. - Data can be stored on a USB flash drive for easy editing on a computer or sharing with other departments.

Introduction

CH₄ is a gas that has a greenhouse effect about 28 times greater than CO₂. One source of CH₄ gas emissions is flooded rice fields. They release the CH₄ gases generated by microorganisms living in the soil into the atmosphere. Since CH₄ emissions from rice fields account for a significant proportion of greenhouse gases emitted from the agriculture, forestry, and fishery industry, various measures are being implemented to reduce emissions, such as managing the water and soil used in rice fields and improving the fertilizers used. The closed chamber method measures variations in gas concentrations due to gases exchanged with plants, such as rice. In this article, a CGT-7100 portable gas analyzer measures the concentration of CH₄ and CO₂ generated inside a specialized chamber placed on the surface of rice paddy soil.

July 1, 2025 GMT