Abstract:

Field experiments and chemical analysis were carried out to study the effects of different nitrogen fertilizers on the polyphenols and there relationship with chemical composition of flue-cured tobacco leaves. The results showed that, the proportion of chlorogenic acid and rutin was in the majority (from 77.77% to 88.64%) in different amount of applied nitrogen; as the increasing of the amount of applied nitrogen, chlorogenic acid content, 4-o-caffeoyl quinic acid content, rutin content, scopoletin content and the totals of 5 kinds of polyphenols were decreased markedly at first, and then increased slightly, while neochlorogenic acid content had the increasing trend. The relationship between polyphenols content (5 kinds of polyphenols and there totals) and main chemical composition (nicotine content, total nitrogen content, the ratio of reducing sugar to nicotine and total nitrogen to nicotine) could be simulated by dualistic and quadratic equation respectively with highly significant relation.