In an attempt to identify phenotypic traits for N-response and NUE in the earliest stages of plant growth, we analyzed the N-responsive germination, respiration, urease activities, and root/shoot growth of 21 Indica genotypes of rice ( Oryza sativa var. The biological improvement of fertilizer nitrogen use efficiency (NUE) is hampered by the poor characterization of the phenotype and genotype for crop N response and NUE. 4Indian Agricultural Statistics Research Institute, Pusa, India.3Anant Cooperative Housing Society, Pune, India.2Indian Institute of Rice Research, Hyderabad, India.1School of Biotechnology, Guru Gobind Singh Indraprastha University, Dwarka, India.Narendra Sharma 1, Vimlendu Bhushan Sinha 1, Neha Gupta 1, Soumya Rajpal 1, Surekha Kuchi 2, Vetury Sitaramam 3, Rajender Parsad 4 and Nandula Raghuram 1*
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