Research by Nguyen Van Bo et al (2003) [3]; Nguyen Vi (1982) [61] concluded that nitrogen use efficiency depends on rice varieties, hybrid rice varieties usually have efficiency higher protein, reaching 10-14 kg grain / kg N was applied, while only 7-8 kg of pure rice paddy / kg N. On Red River alluvial soil, nitrogen making hybrid rice yield increased 40.1% 22,3- [2].
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