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HgNR (nitrate reductase, A), HgNiR (nitrite reductase, B), HgGS (glutamine synthetase, C), HgGDH (glutamate dehydrogenase, D) and HgAS (asparagine synthetase, E). N1: 0, N2: 1.36, N3: 1.81, N4: 2.26, N5: 2.72 kg/year of N fertilizer [CO(NH2)2, N ≥ 46.67%].
