Rice cultivation produces a lot of methane gas, and it's important to measure it accurately. A new method was developed using a gas chromatography machine that doesn't need expensive automatic gas samplers. By manually injecting samples and using a specific split pattern, researchers were able to detect methane effectively. The method showed good results with low variability, high accuracy, and low detection limits. It can also be used to measure methane from different types of rice treated with certain substances. This manual injection approach is a reliable and precise way to detect methane gas in rice cultivation.