Anongnat Sirirak และ Buncha Somboonsuke and Narumon Preuksa. (2020) Determines of Professional Standard for Practitioners of Plant Nutrition Management in Rubber Tree. <i>Khon Kaen Agriculture Journal</i>, <i>48</i>(4), 797-808.Anongnat Sirirak และ Buncha Somboonsuke and Narumon Preuksa. "Determines of Professional Standard for Practitioners of Plant Nutrition Management in Rubber Tree". Khon Kaen Agriculture Journal 48 (2020):797-808.Anongnat Sirirak และ Buncha Somboonsuke and Narumon Preuksa. Determines of Professional Standard for Practitioners of Plant Nutrition Management in Rubber Tree. Faculty of Agriculture:ม.ป.ท. 2020.