Isla, Ramon, Montserrat Salmeron, Jose Cavero, Maria-Rosa Yagüe, and Dolores Quilez. 2015. “Utility of the End-of-Season Nitrate Test for Nitrogen Sufficiency of Irrigated Maize under Mediterranean Semi-Arid Conditions”. Spanish Journal of Agricultural Research 13 (1), e0902. https://doi.org/10.5424/sjar/2015131-6806.