In recent years, potato planting area in hilly and mountainous areas has been increasing and yield has been improved, but mechanization rate of potato harvest is far lower than national average level, and harvest is the largest link of labor in potato mechanization, resulting in gradual increase of labor cost in potato production process and decrease of farmers' benefits．General situation of potato harvesting technology in hilly and mountainous areas and bottleneck problems restricting development of potato mechanization in hilly and mountainous areas were analyzed, and development countermeasures and prospects of potato mechanization harvesting technology in hilly and mountainous areas were put forward, which could provide reference for researchers engaged in potato mechanization harvesting technology in hilly and mountainous areas．

Accelerating whole process mechanized development of rice in hilly and mountainous areas and improving rice production capacity is of great significance for promoting stable and increased rice yield and farmers' income in hilly and mountainous areas and helping rural revitalization．Current situation of rice whole process mechanized production in Hunan Province was introduced, and machinery and tools of ploughing, planting, field management and harvesting links with examples were analyzed, so as to identify weak links in development of rice mechanization in hilly and mountainous areas．Problems in rice whole process mechanization production, key technologies of agricultural machinery and equipment, integration of agricultural machinery and techniques, and development of equipment industry in hilly and mountainous areas were analyzed to provide references for promoting technological progress, transformation and upgrading of rice mechanization equipment and rice whole process mechanization level in hilly and mountainous areas．

Bijie City, a typical hilly area, is one of main tobacco producing areas in Guizhou Province．In order to understand use current situation of agricultural machineries in field production of tobacco in Bijie City fully, and further find out constraining factors on mechanization of tobacco field production, current situation of use of agricultural machinery in 15 tobacco planting base units in 8 districts and counties of Bijie City was investigated and analyzed．On this basis, development strategies for mechanization of tobacco field production in Bijie City were proposed, which included combining actual situation of Bijie City, establishing a tobacco agricultural machinery research and development platform, promoting transformation of suitable mechanized tobacco fields, adhering to principle of balancing construction and management, strengthening construction of agricultural machinery talent teams, establishing a reasonable evaluation system, improving tobacco agricultural machinery access system and reasonable scrapping system, and improving agricultural machinery service system, to provide reference for mechanization development of tobacco field production in Bijie City and hilly and mountainous areas．

Early non-destructive identification of grafting healing status can improve utilization rate of grafting healing devices．Taking melon grafted seedlings as research object, hyperspectral data of grafted area from the 1st to the 10th day after grafting was obtained．Raw spectral data were preprocessed by different methods, such as the first derivatives（FD）and second derivatives（SD）, standard normal variation（SNV）, detrend processing（Detrend）, smooth 21 points（Smooth 21）, multiple scattering correction（MSC）, and combination of two methods as well．Establishing three classification models: support vector machine（SVM）, decision tree and XGboost, principal component analysis（PCA）, competitive adaptive reweighting sampling（CARS）, genetic algorithms（GA）and continuous projections algorithm（SPA）were used to select characteristic variables corresponding to different classification models．Results showed that FD-GA-XGboost model selected 30 characteristic wavelengths, and prediction accuracy reached 93%．Compared with traditional manual judgment of healing state 10 days after grafting, this method could judge healing state of grafted seedlings more accurately 6 days after grafting, which provided an important reference for production of melon grafted seedlings, and has certain theoretical and practical value．

Use of Beidou navigation technology to achieve automatic, intelligent, and precise driving of agricultural machinery is a key direction for development of modern agricultural informatization in China．Based on Beidou navigation technology, research status of automatic driving system of agricultural machinery at home and abroad was expounded, positioning algorithm of Beidou navigation machinery was studied, and a new PVT algorithm was put forward．Hardware of the system was designed using this algorithm, and experimental simulation car testing was conducted．Results showed that under certain conditions of site and weather, positioning accuracy of this scheme was relatively ideal．

Research of basic software system of blockchain and mapping model between agricultural industry chain and blockchain could solve problems such as long agricultural industry chains, scattered production and operation, lack of smooth supply and sales information, difficulty in analyzing market price data, and increased costs．By combining DCEP digital currency payment method, establishing a sharing and exchange mechanism for agricultural industry chain, creating a unified channel for cross departmental and cross link information interconnection, connecting with third-party blockchain platforms and business management systems, an integrated application of agricultural industry information was formed that reached consensus across multiple parties such as producers, logistics, channels, retailers, regulators, service providers, and consumers．It could achieve transparency, security, and sharing of information throughout entire process of agricultural planting, breeding, processing, transportation, and sales, create an ecosystem for agricultural industry, form a national public chain, promote effective support for agricultural digital assets, and promote development of agricultural specialization, refinement, intelligence, and industrialization．

In order to solve problems of chaotic instrument and equipment borrowing, cumbersome management work, and untimely communication between administrators and teachers and students in current laboratory, and to accelerate informationization process of laboratory management, a laboratory information management system was designed and developed based on SSH framework and Java as development language, MySQL as system database, through in-depth research and analysis of college laboratory．The system was designed to cater to different user needs by setting up three user roles, namely laboratory administrator, teacher, and student, to assign corresponding permissions according to roles．It could achieve functions such as administrator user review, laboratory and instrument appointment, laboratory equipment repair, and laboratory equipment information management．The system has a user-friendly interface, simple operation, and strong practicality, which could effectively alleviate work pressure of management personnel, improve laboratory management and utilization efficiency, and meet needs of daily laboratory management．

High temperature solid oxide fuel cells（SOFC）is one of efficient energy conversion technologies, and is also a technology which can simultaneously provide electricity, heat and CO₂ gas fertilizer to meet energy requirement of facility agriculture．Herein, based on characteristics of modern facility energy requirement and SOFC cogeneration, feasibility and broad application prospects of coupling SOFC energy technology and facility agriculture systems were expounded in details．Stable, reliable and low cost SOFC systems can fundamentally solve serious problems of high energy cost, low thermal efficiency and environmental pollution of China's agriculture greenhouse technologies, and at the same time provide a huge market for SOFC industry．

The number and variety of contaminants in rainwater harvesting cellars in rural areas of Northwest China make quality of cellar water inadequate to meet residents' safe drinking water standards．The use of a new energy-saving and efficient water purification process（gravity flow ultrafiltration technology）is an important means of improving quality of cellar water．On the basis of describing characteristics of water cellars in northwest region, factors such as membrane material, membrane components, inlet water quality, and membrane cleaning method that affect operational effects and mechanisms of membrane outflow, membrane fouling, or membrane blockage were analyzed．In depth exploration and analysis were conducted on technical and economic advantages of gravity flow ultrafiltration technology in application and promotion of rural areas in northwest China．It was proposed that gravity flow ultrafiltration technology was suitable for development of water scarce areas in rural areas of northwest China, in order to provide reference for improving quality of cellar water and ensuring safe drinking water for residents．

Focusing on issues of disorderly discharge of vegetable straw waste, secondary environmental pollution, and low resource utilization rate, an evaluation and countermeasures were proposed for ecological and environmental effects, farmers, and policies in process of resource utilization of vegetable straw waste from a macro and multi-dimensional perspective．It is of great significance to improve rural living environment, cultivate new farmers, suppress straw burning, promote energy conservation, carbon sequestration and emission reduction, improve ecological environment of agriculture and rural areas, enhance local and national level of vegetable straw waste treatment, and promote sustainable development of beautiful rural areas．

As a traditional perennial Chinese medicine for both medicine and food in Guizhou, Polygonatum sibiricum Red．meets industrial development requirements of a wide concept of health．Main chemical compositions of Polygonatum sibiricum Red．include polysaccharides, saponins, flavonoids, amino acids, volatile components and so on, which have some functions, such as antioxidant, hypoglycemic, lipid-lowering, and immune regulating effects．Research progress on chemical constituents, pharmacological activities and mechanisms of Polygonatum sibiricum Red．at home and abroad were mainly summarized, to provide reference of healthy products and clinical drug research．

Water and fertilizer integration system is one of the core contents of smart agriculture, which can achieve water saving and fertilizer saving, time saving and labor saving, and improving quality and efficiency in agricultural irrigation．Water and fertilizer integration system mainly consists of components such as a controller, filter, and Venturi fertilizer absorber, as well as modules for control, water and fertilizer supply, mixing, and detection．Structural characteristics and working principles of water and fertilizer integration system was discussed．Based on process of regulating water and fertilizer conductivity and pH value, control objects and strategies of water and fertilizer integration system were elaborated．By utilizing field collection systems, irrigation control systems, integrated water and fertilizer systems, cloud servers, transmission systems, wireless sensor networks, and remote monitoring platforms, real-time monitoring and transmission of front-end information can be achieved．Based on integrated control system of water and fertilizer, remote measurement and control system, as well as integrated system of drip irrigation and micro spray irrigation, key technologies and application modes of water and fertilizer integration were explored．Water and fertilizer integration system based on internet of things could provide technical support for modern agricultural construction and smart water conservancy construction．

Aiming at plot irrigation test which were designed and controlled by different lower limit of water content, conception of critical irrigation amount were proposed that could be used to judge whether irrigating was needed and calculate irrigation amount．In order to calculate irrigation amount conveniently, GUI was designed by Matlab language．Water demand law experiment of greenhouse beans was used to test soil moisture content data during pod setting period．Comparison between critical water quantity discrimination method and average method showed that irrigation discrimination and irrigation water quantity calculation results of two methods were significantly different, mainly due to difference in soil bulk density and field water holding capacity．This method was theoretically feasible and used Matlab programming to GUI design that was fast and convenient to calculate, with significant advantages．

Rural land is foundation and lifeline of rural development, and orderly land transfer can greatly promote rural revitalization and modernization of agriculture and rural areas．In this context, research content of researchers on rural land transfer was summarized, and research progress and achievements related to rural land transfer were summarized．Policy system, transfer market, influencing factors, problems and countermeasures of rural land transfer were elaborated, to provide reference for subsequent research on rural land transfer, thereby improving efficiency of rural land transfer and helping to promote rural revitalization．

At present, domestic bagging edible mushroom liquid strain inoculation method is mainly manual and semi-automatic machine inoculation．The production efficiency is low and mechanical failure rate is high, which has not yet reached requirements of bagging edible mushroom factory production．In response to problems of difficult inoculation positioning, low inoculation efficiency and high equipment failure rate of bagging edible mushroom liquid strain inoculation, a kind of bagging edible mushroom liquid strain inoculation equipment was developed, that could realize automatic transportation, positioning, clamping, vial pressing, capping, spray inoculation, capping, testing and conveying．It could complete fully automatic continuous liquid strain inoculation of fungus seeds．This equipment could effectively reduce manual work intensity and avoid contamination caused by outside environment and caused by long time of opening and closing the lid．It could improve efficiency of liquid strain inoculation and quality of mushroom production, and realize automatic inoculation of liquid strain in bags of edible mushroom．The minimum inoculation capacity of machine was 3236 sticks/hour, and the average was 3256 sticks/hour >3000 sticks/hour．The maximum coefficient of variation of inoculum consistency was 1.9%, and the average was 1.78%＜2%, which met requirements of mission statement．No failure occurred in 56 hours of test work, meeting Mean Time Between Failure（MTBF）> 50 hours．The test drilling depth was 56.3～57.8 mm, and average value was 57.33 mm．There was no failure or problem in strength and stiffness of this machine during whole experiment．It showed that strength and stiffness of mechanical part of machine was designed to meet production requirements．Mechanical performance was stable and reliable．

Based on discrete element software, kitchen waste represented by bone was pulverized and simulated through modeling of double toothed rollers．Corresponding effect of simulation was observed by changing rotational speed n of tooth roll and height h of falling material．Based on particle distribution and color（velocity size）, it was concluded that the best effect was achieved at 35 r/min gear roll speed and 230 mm blanking height, that was, the best crushing effect．Particle bonding model was used to provide theoretical basis for structure optimization of double toothed rollers．

In view of problems of high labor intensity, low efficiency and high labor cost in potted flower production, an automatic circulating bed system was developed, which could complete required transportation operation of potted flower from seedling raising, production, pot conveying, pruning, irrigation, harvesting in cooperation with seedling raising equipment, pot conveying equipment, packaging equipment, etc, and realize rapid transfer of potted flower between different functional areas and supporting equipment．

Science and technology is the key driver of rural revitalization．Meanwhile, scientific research institute is an important force for rural revitalization．However, there are many problems in practice, such as unsustainable methods, poorly targeted projects and low conversion rate of results．Taking Guangxi Institute of Meteorological Sciences as an example, a case study method was adopted to explore and analyze innovative practice process and content of assisting rural revitalization from multiple dimensions．Based on this, basic path of technology assisted rural revitalization strategy was proposed, aiming to provide theoretical guidance and experience reference for technology departments to assist rural revitalization strategy．

In the new era, interdisciplinary tutorial community is an important strategic resource for postgraduate innovative talents cultivative education．It is a system that builds a cross-disciplinary fusion system on basis of a single mentoring relationship, establish a new collaborative model between supervisors and graduate students, and achieves cultivation of innovative talents．Practice has proved that interdisciplinary guidance community could effectively solve problems encountered scientific research, promote establishment of interdisciplinary scientific research, and provide new ideas for exploring interdisciplinary postgraduate guidance relationship．

Under background of promoting education accreditation of engineering specialty in China, teaching reform of Biosafety and Regulations course for bioengineering specialty was studied from aspects of teaching methods, course objectives, assessment methods and achievement analysis of course objectives by integrating OBE concept, accreditation standards and training objectives and graduation requirements of bioengineering specialty．Practice proved that teaching reform has achieved curriculum goals and contributed to the cultivation of engineering talents．

Small class teaching was applied to postgraduate course of Functional Food, to explore advantages of small class teaching．Through reasonable application of small class teaching mode, integration of online and offline mixed teaching, combined with flipped classroom, a diversified and multi-directional assessment system was built to practice and explore application of small class teaching mode in postgraduate course of Functional Food．

Automotive Engineering is one of majors belonging to machinery under engineering discipline, and annual graduated students of about 20000．As an internationally recognized engineer training standard, engineering education professional certification is significant for standardization of training process in colleges and universities, guarantee of training quality, and recognition of graduates．To avoid phenomenon of homogeneous teaching among same majors, automotive engineering major in agricultural and forestry colleges and universities must highlight their regional and industrial characteristics．Basic situation of automotive major in Anhui Agricultural University was expounded, some existing problems were analyzed, and based on this, some innovative exploration of training mode were proposed．

Seedlings growth, empty hole rate, plant height and biomass were conducted with low, medium and more sowing rates using Taifengyou208（TFY208）and Nanjingxiangzhan（NJXZ）being the high quality both hybrid and inbred indica rice in South China．Results indicated that, seedling emergence rate of NJXZ under more sowing rate was lowered by 6.1% than that under low sowing rate．No significant difference for seedling emergence rate of TFY208 at varied sowing rate was detected．With the increase in sowing rates, empty hole rate was lowered significantly．Empty hole rates of both TFY208 and NJXZ were reduced by 2.90% and 5.08% under more sowing rate than low sowing rate, respectively．Plant height of TFY208 was increased with increase in sowing rate during early seedling period（0-7 days after sowing）, while reduced during late seedling period（7-13 days after sowing）．The plant height of NJXJ was reduced with the increase in sowing rate during early seedling period, while was comparable during late seedling period．Root, shoot and total biomass during early seedling period were increased with the increase in sowing rate, while reduced during late seedling period．The root, shoot and total biomass before transplanting weren't affected by sowing rate．In addition, sowing rate was negatively correlated with seedling emergence rate, empty hole rate and plant height before transplanting, while was positively correlated with biomass during the early seedling period．Taken together, more sowing rate（3 to 4 seeds per hole）could reduce empty hole rate, coordinate increase in plant height and biomass, thus improve population quality of pot seedlings．

Effects of mushroom residue cow dung manure with different bran meal as auxiliary material on growth, yield, quality and soil physical and chemical properties of tobacco were studied．Field experiment was conducted to study effects of peanut bran（OFH）, cottonseed bran（OFM）, rapeseed bran（OFY）and soybean bran（OFD）mushroom residue cow dung manure（3.0 t/hm²）on soil organic matter, available nutrients, tobacco plant growth, chemical composition and quality on the basis of 90% local conventional chemical fertilizer application．Results showed that, fertilizer effect of different bran meal was different when 3.0 t/hm² was applied to soil．Nitrogen content and single fresh leaf weight of OFH treatment were the highest, and phosphorus and potassium content of tobacco leaf was similar to that of other bran meal．OFH treatment had the highest proportion of premium tobacco and output value of tobacco leaves, which had no significant difference with OFD treatment, but were significantly higher than OFY and OFM treatment．Different treatments had no adverse effects on chemical constituents of flue-cured tobacco, and OFH treatment had better coordination of chemical constituents．There was no significant difference in comprehensive evaluation score of flue-cured tobacco sensory quality among the four treatments, and OFH was the highest, followed by OFY．Effect of improving nutrition and growth of tobacco plant and improving yield and quality of flue-cured tobacco was better to make mushroom residue cow dung manure with fungus residue from peanut bran as auxiliary material．

Conservation tillage is one of important measures to improve soil water storage and moisture retention capacity and increase crop yield．Long term experimental monitoring was conducted on soil moisture content of different cultivation layers and growth changes of winter wheat crops．Impact of water changes in different soil tillage layers on crop growth was analyzed．A comparison was made between economic, social, and ecological benefits of conservation tillage mode and traditional tillage mode．A conservation tillage technology model suitable for straw mulching and returning to field in Wuyang County, Henan Province was explored．Results showed that with increase of implementation years of conservation tillage technology, growth environment and drought/flood situation of crops showed different effects．Under deep loosening operation mode, soil moisture content was the highest at a depth from 10 to 20 cm, reaching 15.3%, impact on tidal soil was secondary．Average soil moisture content of deep loosening and no tillage sowing mode with a depth from 0 to 10 cm and from 10 to 20 cm was 14.2% and 16.1%, respectively．Different homework modes had the least impact on sand ginger black soil, with a large number of secondary roots in crops, a well-developed root system of about 12.5 cm, an average of 7.3 tillers, and uniform individuals．The longer the years of implementing conservation tillage for winter wheat, the more significant soil moisture and yield increase effect．

Role of silicon in regulating crop water loss, activating antioxidant system, enhancing root absorption, promoting mineral nutrient absorption, and regulating plant hormones under drought stress and related physiological mechanisms were reviewed．Under drought stress, silicon regulated drought resistance of crops through a variety of physiological mechanisms and alleviated damage of drought stress to plants．At present, silicon fertilizer has been used in some agricultural production, mainly used for topdressing outside roots and foliar fertilization of some crops, but no specific role of silicon has been found physiologically, and some of potential mechanisms of silicon on improving plant drought resistance are not clear．Future research needs to further reveal detailed mechanism of silicon to improve plant drought resistance, so as to provide a scientific basis and theoretical basis for silicon in improving crop production efficiency．

Modern marine ranch plays an important role in improving marine ecological environment and promoting sustainable and healthy development of marine economy．Nowadays, it generally encounters various problems of single industrial pattern, low industrial integration and deficient innovation of industrial chain extension and value chain．An in-depth investigation was conducted on construction and development process of Yantai marine ranch, and path characteristics and existing problems of industrial integration were analyzed using operational status of Yantai Dongyu National Marine Ranch's primary, secondary, and tertiary industries as a case study．It was found that main restricting factors were low utilization rate of equipment platform, insufficient scientific and technological force, backward marketing mode of various formats and unmatched government management system and supporting policies．In view of existing problems, countermeasures and suggestions were put forward, such as coordinated development of land and ocean, optimization of industrial pattern, improvement of management mechanism, strengthening of science and technology empowerment and multi-subject cooperation, in order to provide innovative pattern reference for optimization and upgrading of modern marine pastures．

Shellfish industry is an important part of marine fishery economy in Binzhou City, it has developed rapidly and scale has further expanded in recent years．Focusing on theme of high-quality development of shellfish industry, general situation and existing problems were analyzed, and suggestions for shellfish industry of Binzhou City were put forward, in order to provide reference for theoretical research on shellfish industry development of Binzhou City．

In order to promote healthy development of egg industry, based on survey data of consumers in Yantai City, using SPSS 26.0 software, descriptive statistics, comparative mean, factor analysis and other methods were adopted to analyze consumers' satisfaction with egg and influencing factors in Yantai City．Results showed that satisfaction of consumers was at a high level, with an average satisfaction of 3.57．Consumers' satisfaction with egg was related with monthly income and egg price, and with increase of satisfaction, consumption of eggs was gradually increasing．Consumers from families with children under age of 18 were more satisfied with egg, consumers who chose pulp egg trays and plastic boxes were more satisfied with egg, consumers who regularly bought native or branded eggs were more satisfied with egg．Common factors such as egg quality, brand promotion, supply and marketing channels, price factors were main factors affecting consumers' satisfaction with egg．Based on analysis results, it was suggested that relevant enterprises should strengthen quality management, vigorously build egg brand, control egg production and circulation costs．