Concentration and reserves of nitrogen in soils and plant matter in blocks of grass ecosystems of the North‐Western Precaspian region, Russia by G. N. Gasanov, T. A. Asvarova, K. M. Gadzhiev, R. Z. Usmanov, M. A. Arslanov, M. R. Musaev, R. R. Bashirov, K. B. Gimbatova, A. S. Abdulaeva

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