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NR (Nitrate reductase, A), NiR (nitrite reductase, B), GS (glutamine synthetase, C), GDH (glutamate dehydrogenase, D) and AS (asparagine synthetase, E). N1: 0, N2: 1.36, N3: 1.81, N4: 2.26, N5: 2.72 kg N/ year [CO(NH2)2, N ≥ 46.67%].
