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The purpose of Survey and Study on Above-ground Biomass of Rubber Plantations in Pa Yup Nai Sub-district, Wang Chan District, Rayong Province was to survey and study above-ground biomass of the rubber plantations in Pa Yup Nai Sub-district, Wang Chan District, Rayong Province. The research was divided into 2 parts: 1) a preliminary survey of the rubber tree population and 2) an above-ground biomass study. Samples were collected from 80 rubber trees/rai at a distance of 2.5 x 8 meters. According to the measurement of diameter of the rubber tree samples, the diameter at breast height (DBH) was 14.538 ± 3.218 cm with the lowest value of 7.643 cm and the highest value of 22.930 cm. The height of the rubber tree samples was 12.940 ± 2.580 m with the lowest value of 7.420 m and the highest value of 20.720 m. In terms of the total above-ground biomass yield in the trunk, the highest value was 4,442.997 (kg/rai), followed by the leaf which was to 526.995 (kg/rai) and the branch which was 4.597 (kg/rai). The total above-ground biomass yield of various components of the rubber tree was equal to 4,974.589(kg/rai).
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