China is a major producer, consumer, and exporter of garlic in the world. However, in recent years, the frequent fluctuations in the scale of garlic planting have affected the stability and sustainable development of the garlic industry.Scientific analysis of the influencing factors of changes in the garlic planting scale is of great significance for stabilizing the garlic market and promoting the sustainable development of the garlic industry.Using the national garlic planting area from 1989 to 2019 to analyze the characteristics of planting scale changes,the national garlic planting area has been increasing from 1989 to 2006. From 2007 to 2016, the national garlic planting scale has stabilized, and the planting scale has seen zigzag fluctuations from 2017 to 2019. In this paper, the principal component analysis method is used to research and analyze the national garlic planting area and influencing factors data in the past 30 years, and to select the most influential production, unit yield, export value, inventory in main producing areas, garlic wholesale market price, and natural disasteraffected area, the wholesale price of garlic seedlings, the wholesale price of garlic yellow and the planting area of the previous year. The analysis extracts a principal component (contribution rate 80.676%), which is analyzed and fitted. The main influencing factors of the garlic planting area are the garlic wholesale market price and the area affected by natural disasters. Analysis can provide support for farmers, business decisionmaking, and government macromanagement, which is of great significance for promoting the healthy, stable, and sustainable development of the garlic industry.

In order to improve the mechanization of garlic production technology in China, the research status of garlic production machinery at home and abroad in recent years was reviewed, including garlic clove grading equipment, garlic seeder and garlic harvester. It was pointed out that there were some problems in the mechanized garlic production, such as the mismatch between the traditional planting mode with small row spacing and the requirement of mechanical combined harvesting with large row spacing, and the mismatch between the grading standard of garlic cloves and the requirement of seeding machine. In view of the existing problems, this paper put forward the research idea of garlic production mode suitable for mechanization in main garlic varieties and planting areas. Finally, some suggestions were put forward, such as the cooperation between government, industry and enterprises, the formulation of garlic production standard mode and production equipment design standard suitable for mechanized production, the solution to the problem that the whole process management of mechanized production of garlic can not be effectively connected, and continue to tackle key technologies and strengthen the protection of intellectual property rights.

In order to research the influence of peanut seed shape size, hill-drop planter rotating speed, and seed extractor structure on the seeding performance of hill-drop planter, peanut seeds were divided into three levels according to the shape size.In this study, models of hill-drop planter and seeds were designed using EDEM software, which simulated seeding performance under different grades of peanut seeds at different rotational speeds and structural parameters. The simulation results showed that with the increase of the working speed, the qualification index of the hill-drop planter for all levels of peanuts showed a decreasing trend. When the working speed was greater than 40 r/min, the qualification index dropped significantly. When the working speed was rated and the dimensions of the side hole and cavity were 40 mm and 30 mm, respectively, the seed metering performance of large seeds was the best, and the qualification index was 91.37%. When the sizes of the side holes and the cavity were 32 mm and 25 mm, the seeding performance of the medium seeds was the best and qualified. The index was 93.07%.When the size of the side hole and the cavity were 28 mm and 20 mm, the seeding performance of small seeds was the best, and the pass index was 93.02%. It could be seen that the adaptability of the seed and the seed extractor affects the seeding performance. The field comparison test indicated that when the working speed of the hill-drop planter was 40 r/min, the length of the side hole of the seeder was 32 mm, and the length of the cavity was 25 mm, the seeding performance of the hill-drop planter for all levels of peanut seeds was consistent with the simulation change law. It was feasible to apply the discrete element analysis method to the hill-drop planter.This research provided a theoretical basis for the optimal design of the hill-drop planter.