Podong, Chattanong, & Saisunee Junta. " Change in the Status of Secondary Macronutrient Levels in Soil with the Long-term Application of Chemical Fertilizers in Allium ascalonicum L. Plots in Lablare District, Uttaradit Province." Naresuan University Journal: Science and Technology (NUJST) [Online], 28.2 (2020): 94-110. Web. 19 Apr. 2024