Sangtong, Prapit. “Changes in the Phosporus Status of Paddy Soils after the Addition of Phosphate and Lime”. Thai Agricultural Research Journal 3, no. 2 (May 1, 1985): 79–84. accessed October 1, 2026. https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/245254.