Wongkaew, A., Saito, H., Chueasamat, A., Aramrak, S., Nakasathien, S., Sreewongchai, T. Small-scale spatial variability of selected soil properties in a sloped cultivation area  A case study of Phetchabun province’s highland region, Thailand. Int. J. Agric. Tech. [internet]. 2026 Mar. 24 [cited 2026 Sep. 24];22(2):1017-44. available from: https://li04.tci-thaijo.org/index.php/IJAT/article/view/10525