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Vol.13 No.12 2023 Cover Catalog
Equipment and Mechanization
Current Status and Development Suggestions of Agricultural Machinery Research in Hilly and Mountainous Areas
WANG Dongyang, HE Yakai, HAN Yafen, ZHANG Tie, ZHU Yue, WANG Yankun
2023, 13(12): 5-10.   doi: 10.19998/j.cnki.2095-1795.2023.12.001
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Hilly and mountainous areas are weak areas for development of agricultural mechanization in China, research status of agricultural machinery in hilly and mountainous areas from aspects of agricultural machinery design, modular design method and unit operation collaborative control in hilly and mountainous areas were analyzed.Problems that existed in development of agricultural mechanization in hilly and mountains were pointed out, such as insufficient of innovative design method, poor collaborative control effect of unit operation and low degree of intelligence in development of agricultural machinery in hilly and mountainous areas in China.And then, combined with modern design technology, some suggestions were made, such as electrification upgrade of drive mode of agricultural machinery in hilly and mountainous areas, modular design of multi-source drive and efficient transmission power chassis, data-driven modeling and intelligent collaborative control were put forward for development of agricultural machinery in hilly and mountainous areas from perspective of electrification, digitalization and intelligence.

Information and Electrification
Design on Execution Components of Remote Control System for Rotary Tillage Machine Based on STM32
XU Peng, ZHAO Lijun, YANG Yan
2023, 13(12): 31-36.   doi: 10.19998/j.cnki.2095-1795.2023.12.006
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With continuous development of agricultural machinery technology, traditional agricultural machinery has many shortcomings, such as high operational difficulty and poor comfort.Remote control and unmanned driving can effectively solve many of these problems.Taking rotary tiller as an example, its left and right steering actuator, walking clutch actuator, shift actuator, auxiliary transmission actuator, and blade shaft transmission actuator were designed to achieve remote control of rotary tiller.

Biological Environment and Energy
Effect of Full Utilization Mode of Anaerobic Fermentation of Livestock and Poultry Manure-A Case Study of Huangchuan County
YIN Yan, ZHANG Kai, PEI Qiang, YAN Junbao, XU Yuanchang, FAN Jingya
2023, 13(12): 49-53.   doi: 10.19998/j.cnki.2095-1795.2023.12.009
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In recent years, Huangchuan County has strengthened pollution control of livestock and poultry breeding, focusing on combination of planting and breeding, agriculture and animal husbandry cycle, nearby consumption, and comprehensive utilization.Through implementation of projects such as transfer of live pigs out of large counties, promotion of resource utilization of livestock and poultry manure throughout the county, and pilot of green planting and breeding circular agriculture, efforts have been made to improve matching rate and comprehensive utilization level of livestock and poultry manure treatment facilities, and remarkable results have been achieved.Exploration and practice of full utilization mode and results of anaerobic fermentation of livestock and poultry manure in Huangchuan County was introduced, current problems and suggestions were analyzed to provides reference for continuous and in-depth development of full utilization of livestock and poultry manure.

Processing and Storage of Farm and Sideline Products
Comparison of Quick Cooling Processes for Marinated Beef and Correlation Analysis of Evaluation Indicators
ZHANG Ke, JIAN Huabin, LI Zhenlong, WANG Ye, LI Peigang, WANG Bing, DU Zhilong
2023, 13(12): 66-71.   doi: 10.19998/j.cnki.2095-1795.2023.12.012
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After marinated beef is cooked, quick cooling can shorten time from pot to packaging, which is beneficial for maintaining flavor and nutritional value of marinated beef.By using different cooling methods such as liquid nitrogen, ice water mixture, 4 °C, –20 °C, and –40 °C, quality differences of marinated beef were compared and analyzed from aspects of cooling rate, color, texture, and sensory perception.Quality changes during different cooling processes were analyzed.Results showed that cooling rate of beef immediately after being cooked, in descending order, was liquid nitrogen, –40 °C, ice water mixture, 4 °C and –20 °C; the L* value was maximum after liquid nitrogen and –20 °C coolin; taste and texture scores were highest when cooled at 40 °C, and texture indicators were in the middle range.After reheating, cooling rate at –20 °C significantly increased; the L* value was maximum after liquid nitrogen cooling; the hardness significantly increased; sensory evaluation of cooling at 40 °C has the highest scores for all indicators, and texture indicators were all in the middle range.Correlation results showed that there was no significant correlation between sensory evaluation indicators and texture results.Research results could provide theoretical and data support for efficient cooling and packaging of marinated beef.

Water-soil Engineering
Current Situation of Agricultural Use of Non-conventional Water Resources in Gansu Province and Related Issues
WANG Xinmei, JIA Shenghai, WU Lanzhen, ZHAO Tingting, WANG Xinhai, DANG Boqi, CHAI Shutong, ZHAO Guorong
2023, 13(12): 77-82.   doi: 10.19998/j.cnki.2095-1795.2023.12.014
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Contradiction between supply and demand of water resources has always been an important issue troubling economic development of Gansu Province, moreover, due to waste of water resources and groundwater over-exploitation, etc.resulting in a shortage of freshwater resources, coupled with deteriorating water quality, it is gradually put on agenda to develop and utilise unconventional water resources.In order to gain a deep understanding of current situation and level of agricultural use of non-conventional water resources in Gansu Province, and to better carry out provision of a stable supplementary water source for agricultural irrigation, on the basis of research on agricultural use of unconventional water resources in different regions at home and abroad and in the province, current situation and development and use patterns of unconventional water resources in agricultural development and use in Gansu Province were discussed, main problems in agricultural use of unconventional water resources in different regions were summarised, and corresponding countermeasures and suggestions were put forward.

Design,Manufacture and Theoretical Research
Design and Test of Crawler Deep Tillage Machine for Mountain Tobacco Field with Center of Gravity Balance
LI Najia, XU Guangze, RAN Mao, JIANG Houlong, ZHANG Xiaoliang, LIU Fanyi, XIE Shouyong
2023, 13(12): 83-89.   doi: 10.19998/j.cnki.2095-1795.2023.12.015
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Micro-cultivator is widely used in hilly and mountainous tobacco fields for cultivated land operation.Long-term shallow tillage makes soil plough layer shallow, soil harden and plough bottom thicken, which seriously affects yield and quality of tobacco leaves.According to characteristics of hilly and mountainous tobacco fields under ridge planting mode, a center of gravity balance crawler type deep tillage machine for mountainous tobacco fields was designed, which was mainly composed of walking device, power system, rotary tillage device and center of gravity balance mechanism.Structure and working principle of each device were expounded.Key structure was designed, and kinematics analysis of rotary tillage process of rotary tillage device was carried out to determine walking speed of whole machine and rotation speed of rotary blade.' Hui ' -shaped cultivated land method was adopted, and a center of gravity balance mechanism for ridge operation was proposed for this method.Discrete element method was used to analyze ridge operation of deep cultivator.Cultivated land test was carried out in ridge tillage tobacco field.Results showed that deep tillage machine had good operation performance, and land was flat after tillage.Average tillage depth qualification rate of whole machine was 95.4 %, and average soil crushing rate was 91.9 %, which met requirements of tobacco planting.Accuracy and rationality of theoretical analysis and design of crawler deep tillage machine in tobacco field were verified.Research results could provide reference for research of deep plowing machine in hilly and mountainous tobacco fields.

Scientific Research and Teaching
Different Characteristics and Development Trends of Marine Fishery Carbon Sink Research at Home and Abroad
TANG Xianglin, ZHANG Delin, ZHANG Peng, ZHANG Haiyu
2023, 13(12): 103-112.   doi: 10.19998/j.cnki.2095-1795.2023.12.018
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It is significant to clarify development directions and characteristics of marine fishery carbon sink research at home and abroad, which is of theoretical and practical value for China to learn from international experience and achieve "carbon peaking and carbon neutrality" goals and concept of green, low-carbon fishery industry development.Domestic and foreign characteristics and development trends of marine fishery carbon sink research were analyzed with help of bibliometric analysis and systematic review method.Using Citespace visualization technology, hot spots, main research directions and general progress of domestic and foreign marine fishery carbon sink research development since the beginning of the 21st century(2001―2022)were analyzed.Data from Web of Science(WOS)and China National Knowledge Internet(CNKI)were baselines.Firstly, "carbon sink fishery", "carbon cycle" and "ocean carbon sink" were identified to be top three dominant areas through keyword clustering analysis.Secondly, fishery carbon sink(from 2020)and ecosystem services(from 2022)have become highly visible keywords in international academic journals recently, indicating that international research on serviceability of marine ecosystems and their relationship with humans were gradually increasing.Thirdly, during the past 20 years, America has published the most articles in field of marine fishery carbon sink and has the largest betweenness centrality.Research institutions in Germany, Britain and Australia also have brilliant research results.China has a remarkable growth rate of articles and is keeping catching up with and surpass advanced levels.Fourthly, there are both similarities and differences in the focus of domestic and international research on marine fishery carbon sink.The main directions of China's research on marine fishery carbon sink were focused on: principles of marine carbon sink, analysis of effect of marine carbon sink, marine carbon sink enhancement technology and marine carbon collection and utilization and storage technology.However, other countries focued more on evolution of marine ecosystems and their impacts on humans.Fifthly, accounts on marine carbon sink, metrological analysis of physical quantity of marine carbon sink and calculation of marine carbon sink value have received more and more attention.In the meantime, research on breeding mechanism, development model, market construction and incentives of fishery carbon sink has been on upward trend noticeably.

Agronomy and Biotechnology
Regional Experiment on Early Maturing Machine-picked Cotton Varieties in Northern Xinjiang
GAO Yu, XU Haoyi, WANG Xiaotian, SU Chaocheng, HAO Yaming, WANG Jin
2023, 13(12): 128-133.   doi: 10.19998/j.cnki.2095-1795.2023.12.022
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In order to inherit good quality of early maturing machine-picked cotton varieties and strains, 12 early maturing machine-picked cotton varieties from 10 regions in Northern Xinjiang were selected for regional experiments.Results showed that growth period of 12 varieties was 121.1 ~ 125.2 d, standard deviation was ±1.5 d, and early attribute was obvious.Cotton growth period of 10 experimental areas was 113.9 ~ 141.7 d, standard deviation was ±8.1 d.Uniformity of B10 in batting stage was the best.B07 seed cotton yield was the highest, 4.8% higher than B00(CK).B09 lint cotton and frosted lint cotton were superior to other varieties, increasing yield by 10.0% and 9.7% compared with the control, respectively.Yield of intervariety lint cotton reached a significant level by variance analysis and t test.Lint cotton output ranked as B09 > B06 > B05 > B10 > B03 > B07 > B08 > B11 > B00> B04 > B02 > B01.Compared with B00, yield of B05 and B06 increased in all 10 experimental areas, while yield of other 10 varieties increased or decreased in different areas.Comprehensive evaluation of fiber quality detection, B04 and B00 were excellent cotton type Ⅰ standard, B02, B11, B05, B10, B06, B08, B09, B01, B03 were ordinary high quality type Ⅱ standard; B07 was quality Type III standard.Regional experimental results showed that, B09, B06 and B05 varieties could be popularized and cultivated in Northern Xinjiang.

Management of Agricultural Economy
Financial Support for Development Model,Mechanism and Path of Facility Agriculture-Taking Ningdu County,Jiangxi Province as an Example
LIU Bingxin, ZHANG Limin, ZHANG Pu, BAI Yongshuang, YANG Jianfei
2023, 13(12): 138-143.   doi: 10.19998/j.cnki.2095-1795.2023.12.024
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Model, mechanism, and path of financial support for development of facility agriculture were studied.Based on statistical yearbook data of Ningdu County, Jiangxi Province from 2004 to 2022, OLS regression was first used to explore impact of year-end loan balance on agricultural output value in Ningdu County.Fiscal revenue was used as an intermediary variable to examine whether year-end loan balance has an impact on agricultural output value, using stepwise coefficient regression, Sobel test, and Bootstrap test, respectively.Results indicated that increase in year-end loan balance has a positive effect on agricultural output value.For every unit increase in year-end loan balance, agricultural output value increases by 11.47%, and fiscal revenue also has a positive mediating effect.

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