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目的:确定广金钱草的合理施氮水平。方法:在大田栽培条件下,采用随机区组设计,研究了5个施氮水平(150,187.5,225.0,262.5,300.0 kg.hm-2)对广金钱草产量和活性成分含量的影响。结果:施氮可明显提高广金钱草产量及多糖、总黄酮和总皂苷含量,但提高的幅度并不总随施氮水平的上升而明显上升。其中,225.0,262.5,300.0 kg.hm-2施氮水平下产量的差异不显著;225.0,262.5,300.0 kg.hm-2施氮水平下多糖含量的差异不显著,300.0 kg.hm-2施氮水平下的总黄酮含量极显著低于150.0 kg.hm-2施氮水平(P<0.01),262.5,300.0 kg.hm-2施氮水平下的总皂苷含量差异并未达显著水平。结论:225.0~262.5 kg.hm-2为广金钱草的适宜施氮水平。
Objective: To determine the reasonable level of nitrogen fertilizer. Methods: The effects of five nitrogen application rates (150, 187.5, 225.0, 262.5, 300.0 kg · hm-2) on the yield and active ingredient content were studied under field cultivation conditions using randomized block design. Results: Nitrogen fertilizer could obviously increase the yield, polysaccharide, total flavonoids and total saponin content of A. chinense, but the increase range did not always increase obviously with the increase of nitrogen application rate. Among them, the yield of 225.0,262.5,300.0 kg.hm-2 was not significantly different. The difference of polysaccharide content of 225.0,262.5,300.0 kg.hm-2 was not significant at 300.0 kg.hm-2 The content of total flavonoids at nitrogen level was significantly lower than that at 150.0 kg · hm-2 (P <0.01), and the difference was not significant at 262.5 and 300.0 kg · hm-2. Conclusion: 225.0 ~ 262.5 kg.hm-2 is the suitable level of nitrogen fertilizer.