Temitope Olabisi Abodunrin, and Yemisi T. Afolabi , trans. 2020. “Assessment of the Effect of Glycine, Oxalic Acid and Nitrogen-Phosphorus-Potassium (NPK) Fertilizer As Nutrient Supplement Using Phosphate and OxalicAcid As Indices”. Pakistan Journal of Analytical & Environmental Chemistry 21 (1): 102 – 106. https://doi.org/10.21743/pjaec/2020.06.12.