Hernández Alpizar, L., Mora Molina, J. and Coy Herrera, R. 2020. Nitrate monitoring in oil palm drainages (Elaeis guineensis): A tool for crop sustainability. UNED Research Journal. 12, 1 (Mar. 2020), e2807. DOI:https://doi.org/10.22458/urj.v12i1.2807.