Muangprasert N. Rainfed Paddy Soil Fertility Evaluation in Upper Northern Region for Effective Fertilizer Application. Thai Agric.Res.J. [internet]. 1997 Jan. 23 [cited 2026 Oct. 1];15(1):55-6. available from: https://li01.tci-thaijo.org/index.php/thaiagriculturalresearch/article/view/236522