«Effect of the Nitrate-Urea Ratio, Nickel Levels, and Light Intensity on the Development of Lactuca Sativa L. Under Hydroponic Conditions». Agro Productividad (mayo 20, 2026). Accedido mayo 21, 2026. https://mail.revista-agroproductividad.org/index.php/agroproductividad/article/view/3821.