Application of berberine substances as herbicides

The invention is a divisional application, wherein the divisional application discloses an application of isoquinoline alkaloids in herbicides, has an application number of 201711158169. X and is applied on November 20, 2017. The invention discloses the application of berberine substances as herbicides. Researches discover that the berberine substances specifically comprise dihydroberberine, tetrahydroberberine, oxidized berberine, berberrubine, demethyleneberberine or epiberberine. The weeding composition has a remarkable weeding effect on various common weeds such as arabidopsis thaliana, mikania micrantha, eleusine indica, digitaria sanguinalis, sticktight, feather cockscomb and duckweed, is safe to the environment and low in toxicity to people and livestock, can be prepared into herbicides for use, is used for weed control in actual production, and is environmentally friendly and safe. In addition, the development of the herbicidal effect of the substances can promote the comprehensive utilization of reso