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Vol.12 No.8 2022 Cover Catalog
Review and Comments
Innovation and Expansion towards Ecological Agricultural Engineering in Agricultural Engineering Discipline under Background of Rural Revitalization
WEI Xiuju, ZHU Ming, LIAO Yan
2022, 12(8): 5-14.   doi: 10.19998/j.cnki.2095-1795.2022.08.001
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Currently China is implementing strategy of rural revitalization. In addition, it has put forward concept of New Engineering and New Agricultural Discipline construction in education reform. Therefore, development of agricultural engineering discipline has ushered in great opportunities and grand challenges. In order to better serve rural revitalization, expansion direction of agricultural engineering discipline was explored to seek innovation of discipline content with Chinese characteristics. Based on analysis of frontier progress of world agricultural engineering discipline, China's agricultural and rural development stage, characteristics and major needs of rural revitalization, it was considered that research frontier of world's agricultural engineering was biological system engineering, but China can't copy advanced model of foreign agricultural engineering disciplines. China needs to expand direction of agricultural engineering on basis of original secondary disciplines, including ecological agricultural engineering, physical agricultural engineering and biological system engineering, etc. Concept and connotation of ecological agricultural engineering was put forward. it was considered that ecological agricultural engineering was ecological development of agricultural engineering, it was an interdisciplinary subject of agricultural engineering and ecological engineering, and it could be regarded as a branch of agricultural engineering. It conformed to concept of interdisciplinary and integrated development of new engineering and new agricultural science. Under background of rural revitalization in China, it is also necessary to expand direction of ecological agricultural engineering, which is mainly manifested as follows: ecological civilization construction is an important part of rural revitalization, prominent resource and environment problems urgently need to develop ecological agricultural projects, ecological agricultural engineering is realizing way of rural revitalization and rural revitalization calls for ecological agricultural engineering. Suggestions for development of ecological agricultural engineering were proposed, which included giving play to systematic role of agricultural engineering in rural revitalization, highlighting field of rural construction projects in rural revitalization, giving full play to supporting role of agricultural engineering discipline in ecological agricultural engineering, and strengthening discipline research and personnel training of ecological agricultural engineering etc. Innovation and expansion of ecological agricultural engineering in agricultural engineering field met internal requirements of China's contemporary rural ecological revitalization, and it would play an important role in discipline construction of agricultural engineering, agricultural production practice, agricultural and rural modernization in China.

Equipment and Mechanization
Current Status and Solutions Analysis of Mechanized Harvest Technology of Persimmons-Taking Beijing City as an Example
GUO Jianye, CHANG Qing, ZHAO Jingwen, ZHANG Yanhong, PAN Zhanglei
2022, 12(8): 15-19.   doi: 10.19998/j.cnki.2095-1795.2022.08.002
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Persimmons have been planted in Beijing City for more than 600 years. Fangshan Mopan persimmons, as a traditional famous and high-quality special fruit in Beijing City, have won a Chinese geographical indication brand. However, in recent years, its output has been shrinking, and traditional fruit tree planting is facing transformation and upgrading. Difficulty in harvesting has always been "bottleneck" restricting its industrial development. Structure and working principle of several typical harvesting auxiliary equipment and machinery were introduced, main problems existing in persimmon harvesting were expounded, countermeasures and suggestions for mechanized harvesting of persimmons were put forward, and basis and reference for development of mechanized harvesting of persimmons was provided.

Information and Electrification
Design of Precision Mixing Fertilizer System for Potato Water and Fertilizer Integration Based on PLC
LIU Wenliang, YANG Ranbing, ZHANG Jian, YANG Meng
2022, 12(8): 24-29.   doi: 10.19998/j.cnki.2095-1795.2022.08.004
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Aiming at problems of inaccurate fertilizer mixing and detection, no specific target for potato crops, and low level of intelligence of current field potato water fertilizer integrated irrigation system in China, a precision control water fertilizer integrated system based on PLC and Internet of Things control was designed and developed. Due to poor growth environment and many unstable factors of potato in the field, the system used PLC control. Compared with control mode of single chip microcomputer, PLC has many advantages such as high reliability, strong anti-interference ability, simple and convenient programming, strong adaptability to harsh industrial environment and convenient construction. Because traditional field water fertilizer machine used a booster pump to directly inject fertilizer absorbed by the Venturi fertilizer aspirator into main pipe to flush natural fertilizer with water, accuracy of fertilizer mixing cannot be guaranteed, and the EC and pH sensors cannot be accurately measured, resulting in inconsistent fertilizer concentrations of crops in the field, and relatively low crop quality and yield. Compared with traditional water fertilizer machine, adding fertilizer mixing chamber could significantly reduce concentration error of water and fertilizer. EC and pH sensors read current water and fertilizer concentration and pH in real time, perform PID calculation with preset value, and then converted the PID output into pulse output time through linear conversion. The on-off fertilizer suction time of Venturi solenoid valve was controlled through PLC output to achieve accurate adjustment of water and fertilizer concentration, and water pressure fluctuated within set value range with constant voltage frequency conversion cabinet to achieve accurate and stable output of water and fertilizer.

Biological Environment and Energy
All-Round Advantages and Disadvantages of Multi-Dimensional Planting in Facility Greenhouse
ZHANG Jiaqing, SHEN Jiansheng, ZHU Jianxi, WANG Tao, SUN Ping, ZHENG Tao, CHEN Changqing, WANG Gang
2022, 12(8): 39-43.   doi: 10.19998/j.cnki.2095-1795.2022.08.007
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Three-dimensional planting model has been applied in agricultural production, especially in greenhouses. From perspectives of spatial layout of crops and equipment, diversified planting principles, greenhouse environmental control, pest control and related facilities, advantages of space utilization, crop management and economic benefits arising under this planting mode were all-roundedly elaborated, and problems and solution measures of this mode were proposed.

Processing and Storage of Farm and Sideline Products
Whole Process Solution for Construction of Vegetable Cold Chain Processing Smart Factory
ZHANG Ke, LIU Jianxin, WANG Luyan, LI Peigang, WANG Bing, SONG Yanyan
2022, 12(8): 56-61.   doi: 10.19998/j.cnki.2095-1795.2022.08.010
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In recent years, China's food industry has maintained high-quality and rapid development. With help of integration of "industry 4.0" physical information and other systems, leading enterprises are constructing smart factory to realize multi variety, small batch and personalized production and whole process information monitoring, so as to ensure food safety. China's vegetable output ranks among the top in the world. Most clean vegetable processing enterprises has low equipment and technical level, high labor density, low work efficiency and lack of standard system. It is difficult to ensure quality of clean vegetables. It is urgent to improve level of automation, informatization and intelligence. Combined with construction status of smart factory and intelligent development of important clean vegetable processing enterprises, a reference for construction of modern production of clean vegetables was provided.

Food Science and Engineering
Problems and Research Progress of Enzyme Inhibition Rapid Detection of Pesticide Residues
WANG Bin, CAO Lifen, ZHOU Qinfang, GUO Baikun, WANG Lianfang, WANG Wen, WANG Lifang, ZHANG Yu
2022, 12(8): 72-77.   doi: 10.19998/j.cnki.2095-1795.2022.08.013
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Problems, research and application of enzyme inhibition method were analyzed from aspects of detection standards, sample pretreatment, enzymes and kit products, and equipment, based on background of organophosphorus and carbamate pesticide residues in agricultural products in China, combined with detection principle of enzyme inhibition method. How to improve enzyme inhibition rapid detection method in the future had been prospected. It could provide a reference for improving level of rapid detection in food safety in China.

Land Resource Management
Modular Design of Ecological Landscape of Affiliated Agricultural Land Based on Ecosystem Services
YI Shuaiying, ZHANG Liyuan, HUANG Lu, CHEN Xinming, HU Guang
2022, 12(8): 78-86.   doi: 10.19998/j.cnki.2095-1795.2022.08.014
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Multiple benefits from agricultural land largely depend on their ecosystem services. Scientific and suitable design of ecological landscape on agricultural land is an efficient approach to improve supply of ecosystem services. However, affiliated agricultural land which occupied a certain area is always ignored in current ecological landscape design. To improve ecological and landscape benefits of affiliated agricultural land, and increase species richness and related ecosystem services, a new modular design was developed based on ecosystem services for affiliated agricultural land, as ridge, field track, canal and revetment. Results developed five groups, involving ten landscape modules for agricultural ecological landscape, and their ecological and landscape benefits, applicable places and combined application were analyzed. Besides meeting basic affiliated function for supporting agricultural production, this ecological modular design aimed to increase biodiversity level, improve ecosystem services, and embody local agricultural landscape with strong reginal characteristic.

Design,Manufacture and Theoretical Research
Design and Experiment of Straw Cutting and Kneading Round Baler
GUO Xiyan, ZHANG Ning, BAO Zhiliang, GAO Xiaohong, BAO Wuyunbilige, WANG Qiang, GAO Lei, WANG Zeng
2022, 12(8): 87-92.   doi: 10.19998/j.cnki.2095-1795.2022.08.015
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Aiming at current situation of increasing crop straw output, difficult straw collection and storage and low utilization rate in China's agricultural and animal husbandry production, as well as problems of single function and poor reliability of existing straw coiling and forming machine, a new straw cutting and kneading round baler was designed. Main working parts such as cutting and crushing device, forced feeding device, bale chamber and mesh winding mechanism were designed, and field performance test of machine was carried out. Test results showed that picking width was 2.2 m, bale forming rate was 100%, bale density was 150.8 kg/m3, total loss rate of forage was 1.95%. The machine had reliable working performance and all performance indexes met requirements of national standards. It has important guiding significance for study of straw harvesting with high efficiency and high quality.

Scientific Research and Teaching
Operation and Management Mode of Agricultural Engineering Laboratory-Taking Engineering College of Nanjing Agricultural University as an Example
DOU Xianglin, YU Hongfeng, GU Jiabing, AN Qiu, ZHENG Guangli, YU Haiming, HE Ruiyin
2022, 12(8): 108-111.   doi: 10.19998/j.cnki.2095-1795.2022.08.019
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The college's teaching team of Engineering College of Nanjing Agricultural University, reformed practical teaching tasks of agricultural engineering-related majors, such as syllabus, teaching methods, experiments, innovation ability training, and so on. Combined with actual situation of agricultural engineering laboratory, through continuous exploration and practice, an experimental teaching mode of "student-centered, strengthening foundation, paying attention to ability, promoting innovation and improving quality" has been formed in experimental teaching center. It was proved that this management mode was conducive to practical teaching management and experimental equipment maintenance, and it had effectivness in laboratory management practice.

Agronomy and Biotechnology
Breeding and Experiment of Nicosulfuron Resistant Millet Variety Jigu 43
ZHANG Ting, WANG Genping, LI Lin, ZHAO Ling, SHI Zhigang, LUO Yanjie, LI Binghua, CHENG Ruhong
2022, 12(8): 127-130.   doi: 10.19998/j.cnki.2095-1795.2022.08.023
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Jigu 43 was a new non-transgenic high quality herbicide resistant millet variety developed by Institute of Millet Crops, Hebei Academy of Agriculture and Forestry Sciences through sexual hybridization, which was also resistant to dimethoprim, nicosulfuron and imidazolinone herbicides. Breeding process of Jigu 43 was summarized, and its drug resistance test and herbicide dosage test were carried out. Results showed that Jigu 43 showed high resistance to nicosulfuron. This study could provide a theoretical basis for breeding of millet for herbicide resistance and safe and efficient application of nicosulfuron in the control of weeds in grain fields.

Management of Agricultural Economy
Influencing Factors and Mechanisms of Transformation & Upgrading of Agricultural Wholesale Market Based on Perspective from Case Study
YU Donglai, WEN Xiaowei, ZHU Ying, LIU Xuefan
2022, 12(8): 135-142.   doi: 10.19998/j.cnki.2095-1795.2022.08.025
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Taking Guangzhou Jiangnan Fruit and Vegetable Wholesale Market as case study object, dynamic process of its transformation and upgrading was illustrated with grounded theory, and an evolutionary theoretical model of transformation and upgrading of agricultural wholesale market was constructed. Results showed that 11 factors affected transformation and upgrading of agricultural wholesale market. Transformation and upgrading of agricultural wholesale market at different stages could be promoted through market activity mechanism, management efficiency mechanism and policy guidance mechanism. At the same time, interaction of internal and external factors also had an important impact. Policy suggestions on participating in upstream link of supply chain, accelerating construction of information and digitalization, and coordinating policy development, etc, were put forward.

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