Promchuea, S., Wongsri, O., Thanarak, K., Srikul, S., Kolasuek, S., Chawana, C., Jindadach, Y. and Petchrrun, T. 2026. A New Hybrid Oil Palm Variety: DOA Surat Thani9. Thai Agricultural Research Journal. 44, 2 (Aug. 2026), 116–128. DOI:https://doi.org/10.14456/thaidoa-agres.2026.10.