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, Pakistan, v. 21, n. 1, p. 102 – 106, 2020. DOI: 10.21743/pjaec/2020.06.12. Disponível em: https://pjaec.pk/index.php/pjaec/article/view/127. Acesso em: 3 jul. 2025.