citation
Singh, Y et al., 'Enhancing nitrogen use efficiency for sustainable rice-wheat production system in the Indo-Gangetic plains in India', vol. p. 139-164, ill. Ref, In: Agricultural nitrogen use and its implications, ed. by Y. P. Abrol, N. Raghuram and M. S. Sachdev, New Delhi: I.K. International Publishing House Pvt. Ltd, 2007
