Physiological Studies and Ultrastructure of <i>Vigna sinensis</i> L. and <i>Helianthus annuus</i> L. under Varying Levels of Nitrogen Supply by Khadiga Alharbi, Samia A. Haroun, Amany M. Kazamel, Mohammed A. Abbas, Safia M. Ahmaida, Muneera AlKahtani, Latifa AlHusnain, Kotb A. Attia, Khaled Abdelaal, Rasha M. E. Gamel

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