To investigate feasibility of applying mechanized cultivation mode to tomato product in Chinese solar greenhouses of Shanxi Province, a mechanized cultivation mode was developed to replace labor-intensive manual tasks involved in traditional product method．Under mechanized cultivation mode, mechanization level of solar greenhouses was increased from 38.5% to 73.3%．Labor consumption was saved by 113.10 working-day/hm²．The change in net present value was calculated as 29281 yuan/hm²．These findings demonstrated that it was feasible to apply mechanized cultivation mode to tomato product in solar greenhouses of Shanxi Province．Moreover, this mode could offer a potential solution to challenges arising from increased labor shortage and costs in future．

In order to solve problem of header profiling in fresh corn harvester which reaping both corn stalk and spike, an adaptive profiling system for header of fresh corn harvester was developed based on principle of ultrasonic ranging．In this system, ultrasonic ranging sensor was installed in the front end of header divider, which was used to detect height difference between header divider and ground in real time．Height difference signal was transmitted to central control terminal of corn harvester, which issued corresponding adjustment instruction, controlled header adjusting hydraulic system to adjust header height, and realized adaptive profiling of corn harvester's header during operation．The 190 kW four-line all-harvesting fresh food corn harvester was used as a prototype, and adaptive profiling system of header was carried out to verify profiling system．Average operating speed of corn harvester was 4 km/h, rotation speed of cutting table was 400 r/min, and stubble height was from 90 mm to110 mm．Test results showed that in whole process of 8 hours of cumulative operation, header adjustment was stable and there was no contact with the ground．Experimental results verified effectiveness of header adaptive profiling system．

With implementation of policies for national, local, and temporary storage of corn, planting area of corn has significantly increased, and yield of corn straw has also increased．Corn straw contains abundant crude fiber, organic matter, and nutrients such as nitrogen, phosphorus, magnesium, potassium, and calcium required for plant growth．Implementing straw returning to field can effectively enhance soil fertility, improve soil physical and chemical properties, promote black soil protection, promote sustainable land use, and promote sustainable agricultural development．Main methods of returning straw to field include direct return and indirect return．Selection of land return methods should be tailored to local conditions, and selecting appropriate land return methods based on soil conditions can effectively protect farmland environment．Characteristics of different straw returning methods were introduced, impact of straw returning on soil environment was analyzed．It could provide scientific basis for selecting straw returning methods according to local conditions and sustainable agricultural development paths．

Under support of information technology, great changes have taken place in agricultural production．With information technology, agricultural production has gradually realized development of intensification, high efficiency and intelligence．Based on this background, a long-stroke integrated water and fertilizer spraying device driven by intelligent tracked vehicle was designed, which included intelligent motor, flox coupling, support plate, sprinkler head, speed sensor and other components．At the same time, an efficient control system was designed．The whole system included homepage system interface, monitoring system interface, data display interface, real-time parameter interface and other parts．And real-time monitoring of GPS, fertilizer EC value, pH value and other information, real-time monitoring of surrounding environment changes, at the same time will be transmitted to control terminal real-time data, to achieve purpose of remote control．Through control system, constantly adjusted fertilizer ratio and spraying speed according to environment, to make growth of entire crop mechanized and intelligent．

In order to reveal effects of natural factors and their interaction on temporal and spatial changes of vegetation in Kaidu River Basin, using NDVI as research index, combined with 11 natural factors, using linear regression analysis method and geographic detector model, temporal and spatial variation and its driving forces of NDVI in the Kaidu River Basin from 2001 to 2020 were analyzed．Results showed that NDVI in study areas showed an increasing trend, middle and high vegetation cover areas improved significantly from 2001 to 2020．The NDVI was high in the west and low in the east, transformation of low and middle vegetation cover to middle and high vegetation cover was obvious．DEM had the highest explanatory power（40.3%）, it dominated spatio-temporal pattern of NDVI． Natural factors had interactive effects on NDVI, especially interaction between soil type and slope had the strongest influence．The mode of interaction was dominated by bivariate enhancement and nonlinear enhancement effects．Range and type of factors suitable for vegetation growth in the study area was analyzed, which could provide useful reference for local vegetation restoration measures．

In order to solve problems of low efficiency and high cost of Codonopsis pilosula manual excavation, a four-bar mechanism Codonopsis pilosula excavation device was designed based on human simulation．Simplified model of soil- Codonopsis pilosula excavation device was established by means of Proe, simplified model of soil- Codonopsis pilosula - excavation device was established by means of discrete element simulation software EDEM and multi-body dynamics software Adams．Through ADAMS_ EDEM conducts simulation excavation experiments, range of rotational speed and soil entry angle was determined when resistance was low．SAS software was used to carry out optimum balance random design test for rotational speed and soil entry angle, and soil trench excavation test was verified．Simulation results showed that the better range of earth angle was from 75° to 80°．The optimum speed range was from 60 r/min to 90 r/min．Excavation test results showed that when the best combination was 70 r/min and 75° by final analysis, loosing rate of codonopsis pilosula was 97.94%, damage rate was 4.52%．The next was 60 r/min and 75°, loosening rate was 96.62% and damage rate was 5.7% ．

Restricted by type of schools, agricultural and forestry graduates often have some difficulties in finding jobs, such as few job choices and low employment quality．Smart car competitions can help students master professional knowledge and skills．As a national competition integrating technological innovation and theoretical innovation, smart car competition can effectively improve employment level and competitiveness of students by participating in smart car competition．In order to promote students' good employment and employment through smart car competitions, it needs joint efforts of students, universities and society．It also need to actively carry out innovation and entrepreneurship education, strengthen ideological and political theory construction and accelerate construction of competition platforms in daily teaching．

After years of exploration, fertilizer reduction technology in dry farming area of Yuzhong County, Gansu Province has gradually matured, and has been demonstrated and promoted in major crops, providing scientific data support and precise and strong technical support for fertilizer reduction and efficiency improvement in Yuzhong County．From balanced regulation of nitrogen, phosphorus, and potassium fertilizers to precise formula fertilization according to demand, and then to integration of fertilizer reduction and efficiency enhancement technology through increasing application of organic fertilizers to replace（reduce）fertilizers and improving traditional fertilization methods, from 2018 to 2022, cumulative promotion area in major crops such as vegetables, corn, potatoes, wheat, lilies, and traditional Chinese medicine was 866700 hm², with an additional net income of 1.283 billion yuan．Through experiments with different amounts of organic fertilizer for Songhua vegetable, results showed that yield of Songhua vegetable increased with increase of commercial organic fertilizer usage, and commodity rate increased from 46.73% to 50.33%．Through experiments with different amounts of bio organic fertilizer for cabbage results showed that after using bio organic fertilizer and reducing amount of fertilizer by 20%, total phosphorus, dietary fiber, and calcium content of commercial cabbage decreased significantly compared to control, while vitamin C content increased in all treatments．This indicated that cabbage has a more fragrant taste, richer nutrition, and improved quality．The recommended optimal amount of bio organic fertilizer was 3 t/hm², with a maximum reduction of 20% in chemical fertilizer．

Taking selenium rich tea industry in Ankang City, Shaanxi Province as research object, current development status of selenium rich tea industry in Ankang City was introduced from five aspects: industrial scale, private economy, brand value, scientific research and development, and tea tourism integration．SWOT analysis method was used to comprehensively analyze market competition conditions and environment of selenium rich tea industry in Ankang City from four dimensions: policy support, economic foundation, social background, and technological strength．And countermeasures and suggestions for technological, branding, market-oriented, and sustainable development of selenium rich tea industry in Ankang City were proposed from three levels: government, industry, and enterprise．