Preepremmot, P., Amkha, S., Chungopast, S., and Mala, T. “Effect of nitrogen fertilizer and Azospirillum product on growth of rice variety Pathum Thani 1 and bacterial diversity in the rhizosphere”. International Journal of Agricultural Technology 16, no. 5 (September 15, 2020): 1199–1216. accessed October 27, 2025. https://li04.tci-thaijo.org/index.php/IJAT/article/view/7420.