Suparoek Junsupasen และ Issaraporn Amornsawatwattana;Chakrit Panpean. (2024) Soil pH and Nutrient Analyzer for Selecting Suitable Economic Crops. <i>RMUTL Engineering Journal</i>, <i>9</i>(2), 30-40.Suparoek Junsupasen และ Issaraporn Amornsawatwattana;Chakrit Panpean. "Soil pH and Nutrient Analyzer for Selecting Suitable Economic Crops". RMUTL Engineering Journal 9 (2024):30-40.Suparoek Junsupasen และ Issaraporn Amornsawatwattana;Chakrit Panpean. Soil pH and Nutrient Analyzer for Selecting Suitable Economic Crops. Rajamangala University of Technology Lanna:ม.ป.ท. 2024.