黄莲是名贵的中药材,为我县特产,是重要的出口物资。它种植在海拔1,000米以上的中山地区,因雨水多,日照少,草害十分严重,如果不除草,减产50％甚至无收。加之黄莲生长周期长,一般要5—6年才收获。因此除草任务更为繁重。每年要进行4—6次人工除草,每亩每次需30—50个劳动日,这对于地广人稀的主产地 Huang Lin is a valuable Chinese herbal medicines, for my county specialty, is an important export materials. It is planted in the Zhongshan area at an altitude of over 1,000 meters. Due to the large amount of rain and less sunshine, the grass damage is very serious. If it is not weeding, the yield will be reduced by 50% or even no crop yield. In addition, the long growth cycle of Huang Lin, generally 5-6 years before harvesting. Therefore weeding task more arduous. 4-6 artificial weeding each year, every 30-50 working days per acre, which is sparsely populated for the main producing areas