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Background: Astragalus membranaceus seeds have dormant properties that not only limit germination but also negatively affect the growth of seedlings. We investigated the enhancing effect of cold plasma treatment on seed germination and the positive effect on seedling growth of Astragalus membranaceus by treating its seeds with cold plasma at different power levels. Method: The Astragalus membranaceus seeds were treated with cold plasma at power levels of 40, 60, 80, 100, 120, 140, 160, 180, 200, 220 and 240 W for 15 seconds with helium gas and seeds without any treatment were used as control. Results: The Astragalus membranaceus seeds were treated with cold plasma, which not only improved seed germination, but also had a positive effect on seedling growth, with the best results for the 80 W power cold plasma treatment. The 80 W power cold plasma treatment increased the germination rate, germination index and vigor index of Astragalus membranaceus seeds by 26.8%, 12.4% and 39.8%, respectively; increased root length, CAT activity and SOD activity of Astragalus membranaceus seedlings by 24.5%, 99.7% and 7.1%, respectively and decreased the relative conductivity and MDA content of Astragalus membranaceus seedlings by 6.6% and 17.6%, respectively; compared with that of the control group.

： Agriculture occupies an important position in our national economy and raising the level of agricultural mechanization of agricultural production can reduce labor intensity. Research and development of agricultural robot at home and abroad are to further improve the agricultural production efficiency and automation level. According to the difference of agricultural robot and traditional industrial robots, the paper summarizes the agricultural robot‘s special aspects, which include working object, working environment, action and operator etc. Further study summarized the main results of the present study of agricultural robot at home and abroad. According to the structural characteristics of agricultural robot, the robots are divided into a series of walking robot and manipulator robot. On the basis of this research, this paper further puts forward the key technology in the development process of agricultural robot , which mainly comprises a machine vision and image processing technology , target detection and location technology , autonomous navigation and path planning technology , information fusion technology and intelligent control technology. In the mean time, the key technology research decides the development direction of agricultural robot. Basing on the lack of agricultural robot in the present research, this paper further puts forward the bottleneck which needs to break through in the future development process of agricultural robot, mainly including intelligent recognition and positioning, the robot's versatility, structure optimization design. These aspects make agricultural robot in domestic applications more widely, improve the efficiency of agricultural production and promote the development of agriculture in our country..