农业工程

Development Status of Plant Protection Machinery in China

2021, 11(9): 9-13.

Abstract(85) [PDF 865KB](15)

Abstract:
Importance of plant protection machinery in agricultural was introduced．Development characteristics of plant protection machinery in China were analyzed from aspects of ownership，use status，industry status，quality supervision and quality standard of plant protection machinery.The gap between China and foreign countries and existing problems were also stated.It was pointed out that future development trend of plant protection machinery in China was to expand types of application machinery，strengthen innovation and application of basic components，popularize efficient and precise application of plant protection machinery，especially to actively develop agricultural and aviation plant protection machinery.

Application Status and Prospect of TRIZ Theory in Field of Agricultural Equipment in China

2021, 11(9): 14-19.

Abstract(73) [PDF 815KB](11)

Abstract:
At present，agricultural equipment is gradually developing towards customization and intelligence.Under new situation，innovative design of suitable and durable agricultural equipment is key direction of current agricultural machinery research.According to development and research results of TRIZ theory in field of agricultural equipment innovation and design in China，shortcomings of TRIZ in field of agricultural equipment were summarized，including basic research，database establishment，education and training，promotion and publicity.Future research direction in field of agricultural equipment innovative design was prospected，and suggestions were put forward from aspects of basic education，theoretical research，data base building，simulation and policy guidance，so as to provide ideas and directions for strengthening research of agricultural equipment innovation and design.

Design and Experiment of Corn Intelligent Fertilizing Cultivator

2021, 11(9): 20-22.

Abstract(41) [PDF 1821KB](13)

Abstract:
Aiming at problems of poor consistency of fertilization amount of mechanically driven cultivator，an intelligent precise cultivator of variable rate fertilization was designed based on global positioning system（GPS），Beidou positioning system（BDS）.The machine could realize quantitative fertilization by real-time adjustment of motor speed n of fertilizer box along with driving speed v，taking advantage of precise positioning signals of GPS and BDS.Through performance test，variation coefficient of fertilizer rate stability reached 5.54%.

Improvement of Key Equipment for Processing Medicinal Tea in Shanxi Province

2021, 11(9): 23-25.

Abstract(37) [PDF 511KB](7)

Abstract:
In view of problems of incomplete types，single function，insufficient adaptability and reliability of medicinal tea rolling machines and tools，based on existing tea rolling machines and tools outside Shanxi Province，adaptability improvement and test of existing tea machines and tools were carried out to further adapt to key technology of medicinal tea rolling in Shanxi Province，to improve forming rate of medicinal tea in Shanxi Province，reduce crushing rate and loss rate of tea and improve quality of tea.

Development General Situation and Trend of Smart Animal Husbandry in China

2021, 11(9): 26-29.

Abstract(41) [PDF 1643KB](24)

Abstract:
Development status of animal husbandry in China was introduced，and it was pointed out that smart animal husbandry was development direction of animal husbandry in China.Main characteristics of smart animal husbandry，driving factors and restrictive factors of development of smart animal husbandry were analyzed.Development trend and feasible road of smart animal husbandry was also explained.

Design of Greenhouse Temperature Measurement and Control System Based on MCU

2021, 11(9): 30-33.

Abstract(45) [PDF 704KB](9)

Abstract:
A greenhouse temperature measurement and control system was designed，using MCU as main controller. Design objectives and design requirements were analyzed，corresponding design scheme was formulated.Through design of hardware module and software subroutine，building module required by the system was established.Combined with hardware and software of the system，system′s accuracy was tested.Test of the system indicated that desired design purpose was achieved，while the system could display real-time temperature data，and could control temperature using keyboard.

Dynamic Variation Characteristics of NDVI in Dianchi Lake Basin and Its Response to Climate

2021, 11(9): 34-41.

Abstract(51) [PDF 3305KB](7)

Abstract:
Normalized Difference Vegetation Index（NDVI）is an important parameter to reflect change of forest vegetation.It is of great significance to analyze change trend and influencing factors of NDVI in Dianchi Lake Basin for accurately evaluating vegetation coverage and changes in recent years and analyzing driving factors of climate.Two data sets were used： monthly NDVI data of computer network information center geospatial data cloud platform from 2000 to 2015，and MOD13A2 products of NASA in 2020—2021.Trend analysis was used to analyze interannual and intra annual changes of NDVI in Dianchi Lake Basin.The data of precipitation and average temperature in Dianchi Lake Basin from 1999 to 2015 were downloaded from China Meteorological Data Network.Combined with NDVI data，correlation between NDVI and precipitation and temperature was analyzed respectively.Results showed that，during 2000—2015，the annual NDVI in Dianchi Lake Basin and in spring，autumn and winter showed an increasing trend，while annual summer NDVI showed a decreasing trend.However，the NDVI of Dianchi Lake Basin was small in 2020，and it showed a seasonal change trend during the year.On the whole，spatial distribution of vegetation in different areas of Dianchi Lake Basin was obviously different，showed a trend of increasing gradually from south to north and from west to east.The areas with high NDVI were concentrated in the upper reaches of river basin，while vegetation coverage in water body and its surrounding areas was low，and the NDVI in water body and its surrounding areas was decreasing.Precipitation and average temperature in Dianchi Lake basin were fluctuating，and precipitation in 2000—2015 was obviously declining.Through corresponding partial correlation analysis，it was found that precipitation and average temperature had a positive correlation with NDVI，and the strongest correlation was the average temperature and NDVI in the early stage （meteorological factors were one quarter ahead of NDVI）.On the whole，NDVI of Dianchi Lake Basin increased in time and space from 2000 to 2015，but it was smaller in 2020.In terms of climate response，change of average temperature three months ago played a major role in change of NDVI.

Heat Storage and Release Characteristics of Calcium Chloride Hexahydrate Phase Change Wallboard in Greenhouse

2021, 11(9): 42-46.

Abstract(24) [PDF 3384KB](5)

Abstract:
Phase-change energy storage materials are promising in solar greenhouses，which can effectively reduce energy consumption and environmental pollution.Greenhouse brick wall was used as a control，in order to obtain reasonable method and size of phase change materials in greenhouse，heat storage and release time of phase change different thickness wall panels in the greenhouse were tested and analyzed.Results showed that，the 2 cm phase change energy storage wall panel could quickly store and release heat and make full use of materials.However，when used in a greenhouse，the heat storage and release time was short.Wall panels with a thickness of 4~5 cm could meet needs of continuous heat supply and heat absorption every day，but the test found that phase change material was not fully utilized.Comprehensively considering，the 3 cm phase change wall panel was a heat storage and release wall panel suitable for greenhouse applications.Compared with surface temperature of brick wall，phase change energy storage wall panel of 3 cm could effectively reduce surface temperature difference between day and night by about 3.5 ℃ in a sunny environment，and it could effectively reduce energy consumption of greenhouse heating at night when used in the greenhouse.

Effects of Water and Nitrogen Coupling on Water Consumption and Soil Moisture of Isatis indigotica

2021, 11(9): 47-54.

Abstract(34) [PDF 2228KB](6)

Abstract:
Water and nitrogen coupling is the key technology for efficient water saving and nitrogen reduction of Isatis indigotica.The study on effects of water and nitrogen coupling on water consumption and soil moisture dynamic changes of Isatis indigotica provided theoretical guidance for efficient water and fertilizer management.In 2018 and 2019，an experimental study on water and nitrogen coupling of Isatis indigotica was carried out in Yimin Irrigation Experimental Station，Minle County，Zhangye City，central Hexi Corridor.Results showed that，soil water storage in 0～160 cm soil layer showed a zigzag decreasing trend during growth and development of Isatis indigotica.Soil water storage decreased with increase of irrigation amount.Appropriate increase of nitrogen fertilizer could reduce consumption of soil water storage，excessive nitrogen increased consumption of soil water storage，and there was a significant interaction between irrigation and nitrogen application.Total water consumption of high water and low nitrogen（W3N1）treatment was the highest，with the values of 442.2～442.8 mm.Total water consumption of low water and medium nitrogen（W1N2）treatment was the lowest，and total water consumption in medium water and medium nitrogen（W2N2）and high water and high nitrogen（W3N3）decreased by 13.7%～14.8%.Water saving and nitrogen reduction could reduce consumption of soil water storage and water consumption during growth period of Isatis indigotica，which was conducive to virtuous cycle of water and nitrogen in crop-soil water system.

Influence of Wood Fiber Reinforcement Ratio and Moisture Content on Stability of Red Clay Slope

2021, 11(9): 55-60.

Abstract(45) [PDF 2418KB](6)

Abstract:
In order to study influence of wood fiber on stability of red clay slope under different moisture content，direct shear test and slope stability simulation analysis method were used，cohesion and internal friction angle of wood fiber reinforced red clay samples with four reinforcement ratios of 0（plain soil），0.5%，2.5% and 5.0% under five different water content levels were measured，and the minimum safety factor of slope soil was analyzed.Results showed that：the higher the reinforcement rate，the smaller the friction angle in the soil body and the greater the cohesion.Wood fiber mainly enhanced soil stability by increasing cohesion.When moisture content of wood fiber red clay was less than 25%，wood fiber could enhance shear strength and increase minimum safety factor of the slope，and the higher the reinforcement ratio，the greater the shear strength and minimum safety factor，and the better the slope stability.

Dynamic Land Use Change of Hainan Island in Recent 20 Years Based on GLC30 Data

2021, 11(9): 61-69.

Abstract(50) [PDF 8559KB](12)

Abstract:
Land use/cover change（LUCC）is one of the core contents of global change research.In the past 20 years，the land use in Hainan Island has changed significantly due to dual effects of natural environment and human society and economy，but its spatial and temporal dynamic characteristics and pattern are still unclear.Based on GlobeLand30（GLC30）global land cover data，spatio-temporal distribution pattern and dynamic changes of land use in Hainan Island was analyzed in recent 20 years.Results showed that，spatial distribution pattern of land use in Hainan Island was mainly cultivated land and woodland.The cultivated land was mainly distributed in coastal areas，and woodland was mainly distributed in central mountainous areas of Hainan Island.The increase of woodland was the main spatio-temporal change pattern of land use in Hainan Island during 2000—2010，which was mainly from transformation of cultivated land，grassland，wetland and water body.From 2010 to 2020，significant increase of cultivated land and construction land were the main spatio-temporal change pattern of land use in Hainan Island.The cultivated land was mainly transfer from woodland，while the construction land was transfer from cultivated land and woodland.During 2000—2020，the area of forest land and construction land were increased significantly，while the area of cultivated land and grassland were decreased significantly.Changes of wetland，water body，bare land and sea area were very small.Increase of woodland was converted from grassland，which was mainly distributed in central mountainous area and Wenchang City in the northeast of Hainan Island.Increased construction land was mainly from conversion of cultivated land，woodland，grassland，and development of wetland，water body and sea area，which were mainly distributed in surrounding areas of coastal urban settlements of Hainan Island.Decreased cultivated land was mainly converted into woodland，which was distributed in surrounding areas in Haikou，Changjiang，Qionghai，Wanning and other cities and counties of Hainan Island.Grassland reduction area was mainly distributed in central mountainous area of Hainan Island，which was transformed into forest land.Changes of land use degree in Hainan Island was small in 2000，2010 and 2020，which indicated that stability of land use / cover change in Hainan Island was high，and intensity of human land development was moderate.It could provide scientific reference for rational development of land use in Hainan Island and construction of Hainan Free Trade Port in the future.

Simulation and Experimental Study of Multi-duct Air-assisted Orchard Spray System Based on CFD

2021, 11(9): 70-75.

Abstract(30) [PDF 5547KB](19)

Abstract:
In order to study distribution of airflow and droplet distribution in orchard sprayer，distribution of gas field and gas-liquid two-phase flow field in a multi duct air supply and spray system suitable for orchard plant protection was studied by numerical analysis and experiment.Results showed that external airfield distribution of multi duct air delivery system was relatively uniform，and relative error of airflow velocity test value and simulation value at outlet was less than 13.7%.With increase of measurement distance，airflow velocity gradually decayed，and absolute error was basically 0~2 m/s.Relative error of droplet deposition rate （percentage） in the spray area of -0.6~0.6 m was less than 14%.Numerical analysis results accurately reflected airflow distribution and droplet deposition characteristics of air delivery system.

Uncertainty Evaluation of Maximum Lifting Force for Tractor

2021, 11(9): 76-78.

Abstract(31) [PDF 363KB](9)

Abstract:
Maximum lifting force test is a basic and necessary item in tractor performance test，the uncertainty is one of base to judge quality level of laboratory testing.Uncertainty of tractor maximum lifting force was evaluated based on theory of uncertainty and test data step by step，and results of uncertainty value was 0.17 kN.Comparing of influence of uncertainty items，it was cleared that tractor maximum lifting force test in test center was in control.

Modeling of Drum Livestock Manure Treatment Equipment Based on SolidWorks and Experimental Study on Influencing Factors of Fermentation Performance

2021, 11(9): 79-83.

Abstract(53) [PDF 4675KB](22)

Abstract:
With development of livestock industry，more and more researchers pay attention to treatment of livestock manure.In order to solve problems of low efficiency and high power consumption in current livestock manure treatment，treatment efficiency and power consumption of drum livestock manure treatment equipment were analyzed.First of all，according to working principle，structure and technical parameters of drum livestock manure treatment equipment，SolidWorks was used to analyze drum system，feeding and discharging system，and rack system for virtual prototype analysis，and construct complete machine model of drum type manure treatment equipment.Secondly，orthogonal test method was used to analyze influence of the 3 factors（drum temperature，drum speed and drum loading）on equipment processing efficiency and power consumption.Results showed that，factors affecting experimental indexes of drum treatment efficiency from large to small were loading capacity，fermentation temperature and drum speed.Optimal combination was C1A3B3，that was，loading amount was 50%，fermentation temperature was 70 ℃，and drum speed was 0.4 r/min.Factors affecting power consumption test index of drum treatment from large to small were loading capacity，drum speed and fermentation temperature.Optimum combination was C2B2A1，that was，loading amount was 60%，drum speed was 0.3 r/min，and fermentation temperature was 60 ℃.Through comprehensive analysis，loading capacity of drum was the most important factor affecting treatment efficiency and cost of equipment.

Design and Simulation of Buckwheat Clean Threshing Device

2021, 11(9): 84-88.

Abstract(47) [PDF 5246KB](8)

Abstract:
Aiming at traditional buckwheat threshing device，closed cut-flow threshing drum device with buckwheat，problems of residual grain，and high impurity content during threshing process，a clean system design study was carried out.The system included two wind-speed inlets.Each wind speed inlet was composed of a small pipe with a length of 820 mm and a diameter of 27 mm in the same direction as grain barrel threshing drum.Each small pipe had circular holes with a diameter of 12 mm and an interval of 6 mm，used to clean up remaining kernels in the threshing device.The ANSYS Fluid Flow（Fluent）fluid dynamics simulation technology was used to simulate wind field of bar-closed tangential threshing device.Results showed that，when two inlets worked at the same time and wind speeds of 12 and 15m/s were used，cleaning wind speed approximately equal to critical value of floating speed of buckwheat grains.Under this condition，increasing wind speed inlet area，flow velocity between threshing drum and grid concave plate was 3.8～8.3 m/s，which was greater than floating speed of buckwheat grains; velocity of flow field under the grid concave plate was 7～15 m/s，and negative pressure in the flow field was reduced，which was the best choice.

Design of Handheld Thickness Measuring Instrument System Based on Laser Ranging

2021, 11(9): 89-96.

Abstract(52) [PDF 6380KB](9)

Abstract:
In order to measure thickness of plates or tubes in industrial production，a thickness measurement technology based on laser reflection ranging was proposed to measure thickness of bamboo plates or tubes with different thicknesses.It could also be applied to measure thickness of plates and tubes in other industrial production.Based on Kalman filter algorithm to solve problem of data jitter caused by handheld process.At the same time，wireless communication function was used to upload measured data to nearby service station for storage，which was conducive to integration and development of device in the next step.Actual experiment showed that maximum error was 1.5% and average error was less than 1.0%.The system could measure thickness of bamboo tube with low cost，high efficiency，high precision and no contact.

Competitiveness of Agricultural Core Scientific Research Institutions in Beijing-Tianjin-Hebei

2021, 11(9): 97-102.

Abstract(28) [PDF 1853KB](6)

Abstract:
Based on the SCI paper output of 9 core agricultural scientific research institutions in Beijing-Tianjin-Hebei in the past ten years，competitiveness evaluation was conducted from four dimensions of academic productivity，academic influence，academic development，and scientific and technological cooperation.Research results showed that Chinese Academy of Sciences，China Agricultural University and Nankai University were the top three institutions in terms of competitiveness，and scientific research level of Beijing was stronger than that of the other two places.Government and institutions should further implement Beijing-Tianjin-Hebei agricultural collaborative innovation development strategy，coordinate resources and funds，optimize talent structure and project exchanges，in order to achieve coordinated progress of agricultural science and technology in the three places.

Experimental Teaching and Discussion of Food Physics Processing Technology

2021, 11(9): 103-106.

Abstract(26) [PDF 520KB](6)

Abstract:
“Frontier of Food Physical Processing Technology” is a professional course for food science and engineering.This course has a complex knowledge system and strong practicality.The relevant experimental courses could help students practice and consolidate complex theoretical knowledge，and are also an important way to cultivate students′ hands-on ability，and ability to analyze and solve problems.The teaching status and existing problems of Food Physics Processing Technology Specialized Course experiment were analyzed.Furthermore，conduct practice and discussion were finished from four aspects，including selection of experimental content and reasonable arrangement of the experiment，strict requirements of standardizing experimental process，combination of traditional experimental teaching and other experimental teaching modes，improvement of performance evaluation mechanism and discussion of comprehensive ability.It could enable students to complete experiment with interest in the prescribed class time.It hopes to lay a solid experimental operation foundation for cultivating high-quality food majors.

Construction of Skill Training System for Quality and Safety Inspection of Agricultural Products

2021, 11(9): 107-111.

Abstract(54) [PDF 1033KB](7)

Abstract:
Cultivation of professional skills is the focus of cultivation of professional talents in vocational colleges.Cultivation of skilled personnel of agricultural product quality and safety inspection should be guided by talent demand and working process of typical posts of agricultural product quality and safety inspection，clarify objectives and requirements of quality inspection personnel skills training，clarify content of professional skills training，establish a scientific and reasonable assessment and evaluation system，and adopt training mode and effective training methods suitable for professional personnel training，so as to build a complete set of quality inspection personnel skills training system.Only in this way，cultivation of students′ professional core skills could be strengthened，quality of professional skills training could be effectively improved，and needs of industry and enterprises for agricultural product quality inspection talents could be better met.

Reforming Food Basic Experiment Course Based on Innovative and Practical Abilities Cultivation

2021, 11(9): 112-115.

Abstract(37) [PDF 514KB](6)

Abstract:
The higher education innovation training plan has put higher requirements for university students′ innovation abilities.As a basic course of food science and engineering specialty，food basic experiment not only provides practical skills to students，but also cultivates scientific spirit of teamwork，truth-seeking and courage in innovation.However，there are still some factors that restrain cultivation of students′ innovation consciousness.Oriented by engineering education accreditation standards and curriculum objectives，some explorations of learner-centered teaching reform on how to cultivate students′ innovative abilities were presented from four aspects，including optimizing teaching contents，improving teaching methods，perfecting educational evaluation system and enforcing teaching management.

Strengthening Ideological Construction Plan of Agricultural Engineering Students：Taking Jiangsu University as an Example

2021, 11(9): 116-118.

Abstract(34) [PDF 469KB](9)

Abstract:
Starting from existing problems of ideological education for students majoring in agricultural engineering，its internal and external causes were analyzed，and relevant countermeasures were formulated.To ensure and improve quality of talent training in the field of agricultural engineering，some methods were adopted，such as work pattern of“Three All-round Education”，which deepened ideological and political education of students majoring in“agriculture”，establishing a linkage mechanism for talent training of counselors and academic tutors，and broadening students′ horizons，which strengthened ideological construction of students majoring in agricultural engineering，and promoted coordinated development of ideological and moral quality and professional skills of students majoring in agricultural engineering.

Effects of N、P、K on Apple Anthracnose Leaf Blight

2021, 11(9): 119-123.

Abstract(44) [PDF 1075KB](8)

Abstract:
In order to clarify effects of different concentrations of N，P，K on proliferation efficiency of apple anthracnose leaf blight fungus，various concentrations of NaNO3，NaH2PO4 and KCl were used to treat apple bacillus anthracis.The bacterial colony size and growth were observed.Results showed that，the N，P and K elements provided by different concentrations of the agents had both inhibitory and promoting effects on the pathogen.①5 g/L treatment of N elements had the best inhibitory effect on leaf blight of apple anthrax，and inhibitory rate was 29.49%.② Among the P elements，concentration of 1 g/L had the best inhibitory effect on leaf blight of apple anthrax（2.56%）.③37 g/L K element treatment had a certain inhibitory effect on bacteria，and inhibition rate was 5.13%.④ 5 g/L K element treatment had the highest promoting effect on pathogen.⑤ N of 5 g/L+P of 1 g/L and N of 5 g/L+ K of 37 g/L had better effect on constraining bacterial growth.Overall data showed that，effects of different concentrations of three elements on bacillus anthracis were significantly different.Overall inhibitory effect of N was significantly greater than that of P and K.The group of N+P or N+K were better way to restrain bacterial growth.

Detection of Gene Expression and Enzyme Activity Related to Shikimic Acid Formation in Aspergillus cristatus

2021, 11(9): 124-131.

Abstract(47) [PDF 2914KB](6)

Abstract:
Activities of 3-deoxy-7-phosphate synthase（aroF），quinic dehydrogenase（quiB），dehydroquinic acid dehydratase（aroD）and their corresponding gene expression in five growth stages of Aspergillus cristatus were detected to speculate operation of shikimic acid and quinic acid pathway in different growth stages of Aspergillus cristatus.The enzyme activities of aroF，quiB and aroD in five growth stages of Aspergillus cristatus were determined by thiobarbituric method，NAD+method and immune enzyme-linked method，respectively.qRT-PCR and the method of 2-ΔΔCt were used to determine relative expression levels of corresponding genes.Results showed that： in the sexual growth stage of Aspergillus cristatus，enzyme activities of aroF，quiB and aroD increased from（62.08±0.43）U/L to（68.60±0.19）U/L，（5.37±0.58）U/L to（19.56±0.67）U/L，（33.76±0.03）U/L to（34.30±0.10）U/L.With formation of ascospores，enzyme activities of aroF and aroD decreased（P＞0.05），but the enzyme activities of quiB still increased（P＜0.05）.In the asexual development stage，enzyme activities of aroF，quiB and aroD decreased significantly（P＜0.05），from（64.37±0.53）U/L to（60.65±0.33）U/L，（36.74±1.42）U/L to（18.87±0.75）U/L，（31.42±0.70）U/L to（26.59±3.13）U/L.In the sexual development stage，expression levels of aroF and quiB upregulated 114.53 times and 95.48 times，meanwhile，but aroD downregulated 99.34%.In the asexual development stage，expression levels of aroF，quiB and aroD were obvious decline（P＜0.05），they were downregulated with 54.46%，52.83% and 98.03%，respectively.These results indicated that enzyme activities of quiB（R2=0.91）was related with its expression level，but aroF（R2=0.43）and aroD（R2=0.06）had weak correlation with expression corresponding genes.The relevance from enzyme activities of aroF and aroD was stronger，and relevance of expression level of aroF and quiB were also more accordant.This study revealed activity differences and expression patterns of shikimic acid，quinic acid pathway key enzymes and their corresponding genes in different growth stages of Aspergillus cristatus.

Evolution of Regional Water Use Structure and Influencing Factors

2021, 11(9): 132-137.

Abstract(46) [PDF 873KB](7)

Abstract:
Water resources vary greatly among different regions in China，and their effective utilization is an important strategic issue for China′s economic and social development.To accurately predict water use structure，based on the data from 2004 to 2018，taking water use structures of Jilin，Zhejiang，Shandong，Hunan，Sichuan and Xinjiang provinces（autonomous regions）from the northeast，east，central and west of four economic regions as research object using information entropy and principal component analysis to analyze evolution process and influencing factors.Results showed that equilibrium degree of water use structure in Shandong was increasing，and its water use structure was becoming more and more reasonable，while equilibrium degree of water use structure in Xinjiang continued to be at a low level，and there were no obvious changes in the other four provinces；main influencing factors of water use structure were economic and social development，population growth，water-saving technology，water resource endowment and ecological environment maintenance.Finally，some suggestions were put forward to optimize water use structure from aspects of optimizing industry structure，improving level of agricultural water-saving technology，saving domestic water and diversifying water for environmental maintenance.

High Quality Development Path of Agricultural Economy in Yangling Area of Shaanxi Free Trade Zone under“Double Cycle”Pattern

2021, 11(9): 138-142.

Abstract(47) [PDF 729KB](8)

Abstract:
Yangling Area of Shaanxi Free Trade Zone is the only free trade zone with main characteristics of agricultural development in China，which is located in the first national Yangling Agricultural High-tech Industry Demonstration Zone in China.Under new development pattern of international and domestic double cycle，high-quality economic development of Yangling Agricultural Free Trade Zone is facing double risks of epidemic situation and market fluctuation at home and abroad.Firstly，logical relationship between“double cycle”and high-quality development of agricultural economy in Yangling Free Trade Zone was analyzed.Secondly，evaluation index system of high-quality development of agricultural economy in Yangling Free Trade Zone was constructed.Thirdly，influencing factors of high-quality development of economy were put forward，such as policy support，institutional innovation，and agricultural science and technology personnel training.Finally，high quality economic development path of Yangling Agricultural Free Trade Zone under pattern of “double circulation” was discussed，that was to promote deep integration of agricultural scientific and technological innovation and industrial layout，vigorously develop characteristic modern agriculture and actively explore international market.

Purchase Intention of Fresh Agricultural Products Based on Analysis Framework of Perceived Return-Perceived Risk and Transaction Cost Theory

2021, 11(9): 143-147.

Abstract(84) [PDF 647KB](10)

Abstract:
According to perceived return-perceived risk analysis framework and transaction cost theory，an empirical analysis on purchase intention of fresh agricultural products was made by using Logit regression model.Results showed that，women′s willingness to buy fresh agricultural products online was higher than that of men；education level，monthly income level，monthly online shopping times，pursuit of green lifestyle and health style，cognition of fresh e-commerce，diversification of fresh agricultural products provided by fresh e-commerce，affordable price of fresh agricultural products，personalized service provided by fresh e-commerce had a positive impact；age，bad rate of fresh agricultural products，false degree of information provided by fresh e-commerce，delivery time of online fresh agricultural products，search time of online shopping，consultation time of online shopping and return time of online shopping of fresh agricultural products had a negative impact.Fresh agricultural products e-commerce could enhance consumers′ purchasing willingness by increasing added value of guide and purchase service，controlling quality of fresh agricultural products strictly，and improving quality and effectiveness of information transmission of fresh agricultural products.

Analysis on Correlation and Ripple Effect of Agricultural Industry in Shaanxi Province Based on Input-output Model

2021, 11(9): 148-152.

Abstract(55) [PDF 541KB](20)

Abstract:
Industrial correlation level of agriculture in Shaanxi province was analyzed through backward correlation degree and forward correlation degree based on input-output model and input-output extension table of Shaanxi Province in 2017.Ripple effect was also studied through influence coefficient and sensitivity coefficient.Results showed that：the strongest backward correlation of agriculture were chemical products，agriculture，food and tobacco industry; agriculture had a strong forward correlation with food and tobacco，wood processing products and furniture industries; agriculture had obvious pull action to Shaanxi′s national economy，but had a low position in national economy.

2021 Vol. 11, No. 9

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