Effect of complex microbial preparation of free-living and symbiotic nitrogen-fixing bacteria for agricultural crops by V. Goginyan, S. Harutyunyan, T. Stepanyan, G. Khachatryan, V. Bagiyan, R. Hovhannisyan, B. Harutyunyan, M. Kinosyan, N. Ghazanchyan, T. Davidyan, A. Verdyan, K. Chitchyan

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