Effects of Fertilization Methods of Nitrogen on Yield and Contents of Volatile Oil and Total Flavonoid of Schizonepetate nuifolia

The effects of different fertilization methods of nitrogen on yields and contents of volatile oil and total flavonoid of Schizonepetate nuifolia were studied with equal amount of nitrogen,the fertilization methods of nitrogen were planned with applying as base fertilizer, applying as base fertilizer + topdressing in branching period,applying as base fertilizer + topdressing in branching period + topdressing in budding period,no fertilizer( CK).The results showed that application of nitrogen fertilizer could promote the growth and significantly improve the yield of Schizonepetate nuifolia,the effect of applying as base fertilizer + topdressing in branching period was best.The application of nitrogen fertilizer also could significantly increase the total number of branches and the panicle number,it was not affected by fertilization method.The total flavonoid content was increased significantly by application of nitrogen,and the fertilization method with best effect was applying as base fertilizer + topdressing in branching period + topdressing in budding period.The effects of different fertilization methods on yield and contents of volatile oil and total flavonoid were different in the conditions of equal amount of nitrogen,applying nitrogen as base fertilizer could significantly increase the plant height,improve the accumulation of dry matter of spikes and whole plant,but make it difficult for the accumulation of dry matter of stems and leaves,and also obviously improve the volatile oil content and yield of stems and leaves,but significantly inhibite the accumulation of total flavonoids of stems and leaves.The fertilization method of applying as base fertilizer + topdressing in branching period could significantly increase plant height and the accumulation of dry matter,increase the volatile oil yield Table 2 The fertilization amount and time of nitrogen on Schizonepetate nuifolia( kg / hm2)and the total flavonoids content and yield of stems and leaves, but decrease the volatile oil content.The method of applying as base fertilizer + topdressing in branching period + topdressing in budding period could make the plant height slightly reduced,improve the accumulation of dry matter, increasethe content and yield of volatile oil, and significantly inhibite the accumulation of total flavonoids of stems and leaves.