The purpose of the study was to research the growth and change in the content and constituents of essential oil of lemon verbena in different period in Shanghai and to discover the best harvest time and organ.
本实验是为摸索柠檬马鞭草在上海地区的生长规律及不同生长时期精油含有率和成分的变化,以找到最佳收获时间和收获器官而设计此方案。
The checking results of field data shows that the calculation accuracy of THD is relatively higher and the calculation error of harmonic ratio is not more tha.
对现场实测数据的验算结果表明,所提方法对总谐波畸变率的计算精度较高,对各次谐波含有率的计算误差在4%以内。
