Current issue

• 2021 Vol.11 No.8 Published:20 August 2021

  Wheat Quality: Correlation Analysis and Cluster Analysis Xia Lijuan, Cai Kunpeng, Ma Lijuan, Chen Wenqiang, Wang Yu, Ding Chenlu, Ran Qiang, Cai Jian 2021, 11 (8):  1-7.  DOI: 10.11923/j.issn.2095-4050.cjas20200200033 Abstract + ( 511 )   HTML ( 15 )   PDF ( 1287KB )   ( 410 ) The aims are to improve the quality of wheat, determine the excellent quality traits of wheat varieties, and select and breed high quality wheat varieties. In the study, 35 wheat varieties were used as materials. 8 quality traits such as protein content, falling value and wet gluten content were studied with correlation analysis and cluster analysis. Correlation analysis results showed that: the falling value and protein, wet gluten and protein, falling value and wet gluten, stability and falling value, the weakening degree and the water absorption rate were extremely and significantly related; stability and protein, weakening degree and falling value were significantly and negatively related. The results of cluster analysis showed that the 35 wheat varieties tested were clustered into 4 categories at the genetic distance of 3. Group I was ‘Zhongwo 18’; ‘Yuanyu 17’, ‘Taimai 2’, ‘Lemai Z0708’, ‘Huaishi 0812’and ‘Liangyuan 508’ clustered into group II: ‘Tuanmai 102099’, ‘HS44’ and ‘An 1211’ clustered into Group III. Group IV had 26 wheat varieties, including ‘Baofeng 1269’, ‘Huacheng 870’, ‘Wanke 101547’, ‘Mindeli 2’ and ‘Longmai 1’, ‘Jian 20651’, ‘Bomai 0610’, ‘Jindan 6166’,’ Annong 1203’, ‘Baofeng 2018’, ‘JM-1’, ‘Wangjiaba 1110’, ‘Annong 0622’, ‘GR123’, ‘ An 1243’, ‘Luyu No. 9’, ‘Wanmai 4308’, ‘Fu 0652’, ‘Wanmai 52’, ‘Shu Xinmai 318’, ‘Su 11037’', ‘Haomai 56’, ‘Fu 100’, ‘Zhongmai 1023’, ‘Nuofeng 568’ and ‘Aotemai No. 1’. This experiment could provide a theoretical basis for breeding high-quality wheat varieties and hybrid combinations.

  Different Planting Parameters: Effects on Yield and Photosynthetic Efficiency of Summer Soybean Qu Yang, Wang Kezhen, Liu Yang, Luo Yan, Yang Qinghua, Liang Fuqin 2021, 11 (8):  8-13.  DOI: 10.11923/j.issn.2095-4050.cjas19040010 Abstract + ( 531 )   HTML ( 9 )   PDF ( 1320KB )   ( 229 ) To study the effects of different planting parameters on yield and photosynthetic characteristics of summer soybean, taking ‘Baodou 6’ and ‘Qindou 10’ as experimental materials, we set the orthogonal design (L934) with 4 factors and 3 levels. The results showed that: different treatments had different effects on yield and photosynthetic characteristics (P<0.05), the yield of treatment 3 was the highest which increased by 2.24%-24.27% compared with that of others; moreover, Pn, Ci, and Tr of treatment 3 were the highest, and they increased by 17.31%-61.44%, 5.26%-28.62%, 6.8%-9.36% compared with that of others, respectively; leaf WUE of treatment 3 was the highest, the next was treatment 6, and the last was treatment 7; leaf WUE of blooming period was higher than that of seed-filling phase; the planting date (20 June), planting density (150000 plants/hm2), compound fertilizer (225 kg/hm2), and boric fertilizer (3.0 kg/hm2) had the highest leaf WUE in tested phase. The combination of planting parameters has a significant effect on the yield and photosynthesis performance of summer soybean, and treatment 3 is an optimal planting group.

  Genetic Transformation System of Different Genotypes of Buckwheat: A Preliminary Study Wang Xinfang, Feng Jinfang, Hou Siyu, Feng Jinhua, Du Wei, Feng Hongmei, Han Yuanhuai, Liu Longlong, Ma Mingchuan, Wang Junzhen, Sun Zhaoxia, Li Hongying 2021, 11 (8):  14-21.  DOI: 10.11923/j.issn.2095-4050.cjas20200200027 Abstract + ( 515 )   HTML ( 10 )   PDF ( 1823KB )   ( 314 ) The aim is to utilize the basis of genetic transformation to break the bottleneck of buckwheat hybridization and germplasm innovation, and improve the research level of buckwheat. In this experiment, common buckwheat ‘PI647061’ and tartary buckwheat ‘ZNQ152’ were used as materials, and the hypocotyls were cultured by orthogonal experiment. The callus was infected by agrobacterium-mediated transformation, and the temporary expression of GUS gene was observed by histochemical staining. The results showed that MS + 2.0 mg/L 2,4-D + 1.0 mg/L 6-BA could make the calli ratio of hypocotyls reach more than 90%. In MS + 0.5 mg/L NAA + 1.0 mg/L 6-BA, hypocotyls of ten species of buckwheat had the highest differentiation rates, and the highest regeneration rate was 52.6%. The calli were infected by agrobacterium tumefaciens LBA4404, which carried the genetic transformation vector pRI201-AN-GUS. And the regenerated seedlings were obtained after selective culture, and then the blue spots of GUS gene expression were successfully observed in the leaves. The positive rate of transformation was 1.23%. This study provides a theoretical and practical basis for the exploration of the transformation of buckwheat excellent genes and the establishment of an effective genetic regeneration system.

  New Sweet Potato Germplasm Created by Radiation Mutation Technology Jie Qin, Tao Chunlai, Zhang Gong, Cui Shaoyu, Shi Ying, Liu Yang, Zhou Jiandong, Du Deyu 2021, 11 (8):  22-26.  DOI: 10.11923/j.issn.2095-4050.cjas2021-0001 Abstract + ( 501 )   HTML ( 7 )   PDF ( 2397KB )   ( 351 ) The purpose of the study is to obtain beneficial mutants of sweetpotato by radiation mutation technology, and enrich sweetpotato germplasm resources. In this experiment, the main sweetpotato variety ‘Shangshu 19’ was used as test material. The embryogenic suspension cells were irradiated with60Co γ ray and the irradiation doses was 80 Gy. After 6 weeks of irradiation, the surviving cells were transferred into MS solid medium containing 1.0 mg/L ABA to induce differentiation, and then transferred into MS medium to obtain 138 complete plants. Through investigating and determining the top leaf color, vein color, top leaf shape, leaf shape, top villi, potato shape, drying rate and soluble sugar content of the irradiated progenies, it was found that the top leaf color of one line (‘S19Y038’) changed, and the drying rate of three lines (‘S19Y116’, ‘S19Y215’and ‘S19Y219’) were increased significantly by 5.98%, 5.65% and 3.32%, respectively. The soluble sugar content of one strain (‘S19Y013’) was significantly increased by 17.81% compared with that of the control. These mutants with excellent characters could enrich the sweetpotato germplasm resources and have a good application prospect in breeding high-quality sweetpotato varieties.

  25 g/L Spinosad Suspension and 1% Emamectin Benzoate Microemulsion: Control Efficacy on Plutella xylostella in Cabbage Zhang Xuping 2021, 11 (8):  27-31.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0166 Abstract + ( 491 )   HTML ( 5 )   PDF ( 1284KB )   ( 391 ) The aim of the study is to identify the control efficacies of different dosages of pesticides on diamondback moth (Plutella xylostella) in cabbage and to select the optimum dosage. A field trial was conducted with 25 g/L spinosad suspension and 1% emamectin benzoate microemulsion in Junan County, Shandong Province in 2019. The results showed that the Plutella xylostella was controlled effectively by 25 g/L spinosad suspension with 18.75-25 g/hm2 and 1% emamectin benzoate microemulsion with 1.5-2.25 g/hm2. The control efficacy was 87.74%, 91.86%, 76.87% and 83.46% respectively after three days of application and was 90.68%, 95.40%, 85.79% and 90.58% respectively after seven days of application. For 1% emamectin benzoate microemulsion, the control efficacy of higher dosage was better than that of lower dosage. 25 g/L spinosad suspension with 25g/hm2 had the best control efficacy, which could be up to 95.40% after seven days of application. The control efficacy of 25 g/L spinosad suspension was slightly better than that of 1% emamectin benzoate microemulsion after seven days of application. In conclusion, the two pesticides can be used as safe, effective and ideal pesticides, and their control efficacies were both above 85%. It is suggested that the two pesticides are used alternately in order to avoid resistance.

  Effects of Organic Fertilizer Substitute for Chemical Fertilizer on Rice Yield and Soil Physicochemical Properties Mao Wei, Li Wenxi, Zhao Yuhan, Chen Ming, Xu Xunyan, Wang Changsong, Wang Juanjuan, Qian Xiaoqing 2021, 11 (8):  32-36.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0143 Abstract + ( 532 )   HTML ( 19 )   PDF ( 1180KB )   ( 310 ) The study aimed to investigate the response of rice yield and components, and soil physicochemical properties to organic fertilizer (OF) substitute for chemical fertilizer (CF) in rice-grain rotation system, and provide theoretical foundation for rational fertilization, increase yield and promote fertility. The experiments was conducted in long-time fertilizer test point in Yizheng, Jiangsu, 6 treatments were set: convention chemical fertilizer (M0), OF ratios of 10% (M10), 20% (M20), 30% (M30), 40% (M40), and 50% (M50). The yield and composition were studied, and the basic physicochemical property was measured. The results indicated that compared with M0, the rice yield decreased at the ratios of 40% and 50% in the first year, and increased at all treatments in the second year. The highest rice yields were observed at the ratios of 30% and 40% in the second year. With the increase of OF ratio, soil organic matter content increased significantly, whereas there were decrease trends for the concentrations of total phosphorus and available phosphorus, and small increase was found in available potassium, there were no significant differences in other indices. In the precondition of stable rice yield, 20%-30% OF could promote crop growth and nutrient uptake, increase soil fertility.

  Yongzhou Tobacco-growing Soil: Main Chemical Characteristics and Cluster Analysis Jin Zhili, Chen Mengsi, Shao Lanjun, Yu Jie, Zhou Xiangping, Wang Xichun, Yuan Fang 2021, 11 (8):  37-41.  DOI: 10.11923/j.issn.2095-4050.cjas20190900202 Abstract + ( 448 )   HTML ( 5 )   PDF ( 1231KB )   ( 240 ) To understand the chemical characteristics of tobacco-growing soil in Yongzhou, 689 tobacco-growing soil samples from 79 tobacco-planting towns in Yongzhou of Hunan were investigated and analyzed in 2015. The results showed that the collected soil samples had the characteristics of high pH and were abundant in content of soil organic matter and cation exchange capacity, and up to 92.6% and 91.6% of the soil samples were above medium level respectively in organic matter and CEC. Tobacco-growing soil had high soil fertility, and there was a positive correlation between the soil pH, organic matter and cation exchange capacity. The results of cluster analysis suggested that tobacco planting area in Yongzhou could be divided into two different characteristic regions, and measures of rational fertilization and soil conservation accorded with local conditions should be considered.

  Concentration of Soluble Heavy Metals in Farmland Drainage and Its Relationship with Soil Properties Zhang Xiumei, Yang Wenye, Zhang Dan, Xie Guoxiong, Yuan Hangjie 2021, 11 (8):  42-47.  DOI: 10.11923/j.issn.2095-4050.cjas20200200038 Abstract + ( 349 )   HTML ( 8 )   PDF ( 1172KB )   ( 326 ) To understand the change characteristics of heavy metal concentrations in farmland drainage and their influencing factors, the representative farmlands of paddy field, orchard, vegetable field and nursery field were selected from Hangzhou. The authors sampled and analyzed the concentrations of water-soluble cadmium, cobalt, chromium, copper, iron, nickel, lead, zinc and manganese in the runoff drainage caused by rainstorm, and compared them with the status of heavy metals in urban runoff drainage. The analysis results showed that the soluble concentrations of different kinds of heavy metals in the farmland runoff water during the rainstorm were quite different. The average concentrations of the metals were as follows: cadmium (0.19 μg/L) < cobalt (0.46 μg/L) < chromium (1.04 μg/L) < nickel (1.73 μg/L) < lead (4.98 μg/L) < copper (88.47 μg/L) < zinc (184.52 μg/L) < manganese (609.52 μg/L) < iron (1135.21 μg/L). The concentrations of copper, zinc, manganese and iron in the runoff water were significantly higher than those of other metal elements. Except manganese and iron, the concentrations of heavy metals in farmland runoff water were low, which could basically meet the requirements of Class I and II surface water quality. Statistical analysis showed that the concentrations of soluble heavy metals in surface runoff water were affected by land use. The concentrations of iron and manganese were the highest in paddy field runoff, the concentration of copper was the highest in orchard runoff, and the concentrations of cadmium, cobalt, chromium, nickel, lead and zinc were the highest in the urban regions runoff. The correlation analysis showed that the concentrations of heavy metals in the surface runoff water were mainly negatively related to soil pH, and positively related to the total and water-soluble contents of the soil heavy metals, but they were not significantly related to the soil cation exchangeable capacity, organic matter content and clay content of the soils. The contents of heavy metals in the surface runoff were mainly affected by the degree of soil heavy metal pollution and pH. The concentration of heavy metals in the surface runoff from the normal farmland did not have a significant impact on the surface water quality.

  Effect of Integration of Water and Fertilizer on Growth and Fruit Quality of Prunus salicina ‘Younai’ in Mountain Orchards Zhang Weiqiang 2021, 11 (8):  48-52.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0212 Abstract + ( 397 )   HTML ( 9 )   PDF ( 1165KB )   ( 301 ) Under the condition of equal fertilizer cost, taking Fujian characteristic fruit Prunus salicina ‘Younai’ as test material, a comparative study was conducted on the length and thickness of branch tip growth, fruit quality, yield performance and fertilizer cost under integrated water-fertilizer application and conventional fertilizer application, aiming to provide reference for the integrated water-fertilizer application in mountainous areas. The results showed that the integrated water-fertilizer application could promote the growth of branch tip length and thickness, increase the content of soluble sugar, soluble solids and Vc, reduce the content of titratable acid, and increase the average fruit weight per fruit, edibility and yield. Under the condition of equal fertilization cost, the integrated water-fertilizer application could save 1104.0 yuan/hm2 in labor cost. It is suggested to optimize the integrated water-fertilizer application technology in combination with climatic conditions such as precipitation, as well as soil characteristics and ecological environment in mountain orchards.

  Research Progress of Breeding and Cultivation Practices of Pineapple Liu Chuanhe, He Han, Shao Xuehua, Lai Duo, Kuang Shizi, Xiao Weiqiang, He Xiugu 2021, 11 (8):  53-59.  DOI: 10.11923/j.issn.2095-4050.cjas2021-0030 Abstract + ( 723 )   HTML ( 15 )   PDF ( 1232KB )   ( 862 ) In this paper, the research progress of pineapple cultivars-breeding and cultivation practices was summarized, including current advances in research on pineapple gernplasm resources, hybrid breeding, mutation-selection breeding, genetic engineering breeding, as well as high and efficient cultivation practices such as seedling propagation, plant technology, flower forcing, cold- and sunburn- proofing. Also, the future research directions of pineapple breeding and cultivation practices were discussed. The major future research focus of pineapple breeding is to establish a new pineapple breeding system with hybrid breeding and mutation-selection breeding as the main body, and genetic engineering breeding as the assistant procedure based on the accurate evaluation of pineapple germplasm resources. It is also important to carry out the research on the mechanism of the occurrence of the black heart disease of pineapple and the transparent pineapple as well as the cultivation practices to reduce the occurrence of the two diseases. In addition, the study on non-destructive testing technology and the intelligent and labor-saving planting technology are the necessary parts of pineapple research.

  Screening of Cucumis metuliferus Germplasm Materials with Resistance to Watermelon Mosaic Virus Gao Qiang, Ren Hailong, Fu Xiaofa, Zhang Yan, Xian He, Wang Li, Zhou Bo, Zhang Hao, Xu Lin 2021, 11 (8):  60-63.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0263 Abstract + ( 431 )   HTML ( 5 )   PDF ( 1382KB )   ( 345 ) The paper aims to determine the resistance of Cucumis metuliferus to watermelon mosaic virus (WMV). WMV was inoculated to 20 C. metuliferus germplasm materials for identification by mechanical rubbing at seedling stage in greenhouse. The results showed that C. metuliferus was the specific host of WMV and had abundant resistant germplasms, among the materials, PI292190 showed immunity, and PI202681, Hm4-1-1, Hm1-4-1 showed high resistance. This study could provide abundant resistant materials for the study of resistance mechanism and the transformation of antiviral genes in C. metuliferus.

  The Optimized Formula of Grifola frondosa Cultivation with JUNCAO Shen Xia 2021, 11 (8):  64-69.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0021 Abstract + ( 415 )   HTML ( 8 )   PDF ( 2086KB )   ( 240 ) Sawdust is the main culture medium of Grifola frondosa. To alleviate the contradiction between fungi and forests, the medium formula of G. frondosa was optimized through mixed material design with Phragmitas communis, Miscanthus floridulus, Saccharum arundinaceum and Dicranopteris dichotoma, and the yield of G. frondosa fruiting bodies was used as the assessment index, so as to screen the cultivation substrate and the best formula that could replace the sawdust substrate. The result showed that the appropriate proportion of Miscanthus floridulus and Dicranopteris dichotoma could replace sawdust to cultivate G. frondosa. The best formula was 45% Miscanthus floridulus, 30% Dicranopteris dichotoma, 5% wheat bran, 18% corn flour, and 2% gypsum, and the average yield per bag was 130.28 g, which was the same as that of the control formula (130.47 g).

  The Difference of Physicochemical Indexes and Chemical Components in Different Parts of Polygonatum kingianum Li Ling, Huang Yuling, Yang Yuling, Tian Yingqiu 2021, 11 (8):  70-75.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0173 Abstract + ( 491 )   HTML ( 7 )   PDF ( 1408KB )   ( 573 ) The aim is to study the content difference of dryness, ash, extract, polysaccharides, saponins, flavonoids and phenols in different tissue parts of Polygonatum kingianum, and to provide a basis for the full development and utilization of P. kingianum. The sample was divided into 8 parts, the drying ratio was determined by using electronic scale, the total ash content was measured by muffle furnace, the content of extract was calculated by alcohol soluble hot-dip method, the contents of polysaccharide, total saponins, total flavonids and phenols of P. kingianum were quantified by visible ultraviolet spectrophotometer, and the results were analyzed by principal component analysis and cluster analysis. The content of flavonoids and phenols in the leaves of P. kingianum were 1.06 mg/g and 3.46 mg/g, respectively. The content of polysaccharide, saponin and extract were relatively high in old rhizome and new rhizome, respectively 8.18% and 7.83%, 1.31% and 1.85%, 63.88% and 82.23%. The results of principal component analysis and cluster analysis showed that the new rhizome and old rhizome were clustered into one group, and the other six parts were clustered into one group, among which the leaves and the apetalous stems were clustered into a small group. In conclusion, the components of different parts of P. kingianum are different.

  Fertigation Technology: Application in Ginger Production Li Shouhua, Guo Hong, Wang Caixia 2021, 11 (8):  76-79.  DOI: 10.11923/j.issn.2095-4050.cjas20190600072 Abstract + ( 528 )   HTML ( 16 )   PDF ( 1045KB )   ( 464 ) To solve the problems in ginger production, such as high water consumption, excessive fertilization, nutrition disorders, labor-intensive, low yield and poor quality, we combined fertigation technology and ginger production practices, took into consideration the aspects of physical and chemical properties of soil, equipment selection and design, water selection, fertilizer selection, the scheme of water and fertilizer in each growth period, expounded the key points of fertigation technology application in ginger production, and worked out a general technical specification of fertigation, which embodies the advantages of fertigation and provides references for ginger production.

  Feeding Mulberry Leaf Powder to Tenebrio molito: Effect on Growth and Development Zhang Lili, Zhang Yuping, Fan Tao, Chen Ming 2021, 11 (8):  80-84.  DOI: 10.11923/j.issn.2095-4050.cjas20191200301 Abstract + ( 658 )   HTML ( 9 )   PDF ( 1312KB )   ( 601 ) To reduce the economic cost of feeding Tenebrio molitor and improve the utilization of mulberry leaf, different proportions of mulberry leaf powder were added into the feed of Tenebrio molitor, the effects of adding mulberry leaf powder on the growth and development of Tenebrio molitor larvae, and the contents of crude protein, crude fat and water were studied. When the adding proportion was less than 25%, it promoted the weight increasing of Tenebrio molitor larvae and shortened the growth cycle. While when the adding proportion was more than 25%, it inhibited growth and development of Tenebrio molitor larvae. The feeding proportion of mulberry leaf powder of 7.5% increased the weight and crude protein content of Tenebrio molitor larvae significantly, and decreased the content of crude fat. The addition of mulberry leaf powder in the feed did not affect the water content of Tenebrio molitor larvae. Taken together, adding appropriate mulberry leaf powder can improve the growth and development of Tenebrio molitor larvae, and the accumulation of the crude protein, but it is not beneficial to the accumulation of crude fat in Tenebrio molitor larvae.

  Research Progress on the Application of Essential Oils in Animals Wang Lin, Liu Guilian, Zhu Jiubao, Wang Wei, Tang Li 2021, 11 (8):  85-89.  DOI: 10.11923/j.issn.2095-4050.cjas20190800160 Abstract + ( 430 )   HTML ( 10 )   PDF ( 1139KB )   ( 373 ) The physical properties of plant essential oils are reviewed, and the main classification, efficacy and mechanism of plant essential oils, their application in pig and chicken, and the problems in the development are briefly described. We point out that plant essential oils can improve animal production performance, enhance immunity and promote healthy growth of animals. The study shows that there is no uniform standard for plant essential oils as feed additive in production and product quality evaluation at present, resulting in the intermingled quality of essential oil products. Therefore, some steps should be taken to strengthen the production process, the supervision and management, and relevant systems, to promote the healthy and rapid development of plant essential oils.

  Design and Implementation of Digital Fruit Industry Integrated Information Management Platform: Based on Coral Component Architecture Zhang Rui, Zhu Chunyan, Liu Chang, Xu Shipu 2021, 11 (8):  90-97.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0136 Abstract + ( 416 )   HTML ( 15 )   PDF ( 3678KB )   ( 383 ) People need more related information during agricultural production. This paper takes the fruit industry as the background, and designs and develops a digital fruit industry comprehensive information management platform based on the Coral component architecture for the information service in the fruit industry planting process. The platform is divided into data acquisition layer, service layer and application layer. On this basis, the functional structure of the designed system includes 4 functional modules including agricultural Internet of Things monitoring management, planting production management, expert remote service and agricultural products online shopping mall. The platform provides relevant technical services, information, and norms for fruit industry practitioners. It is of great significance to promote the informatization of the fruit industry planting process.

  Status Quo and Countermeasures for China-Africa Agricultural Science and Technology Cooperation Wang Rui, Zhang Huijie, Chen Tianjin, Zhang Shuai 2021, 11 (8):  98-103.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0256 Abstract + ( 518 )   HTML ( 13 )   PDF ( 1187KB )   ( 281 ) China-Africa agricultural science and technology cooperation is an important part of China-Africa agricultural cooperation. Promoting China-Africa agricultural science and technology cooperation will help African countries solve the food crisis, achieve sustainable agricultural development, and improve the discourse power of developing countries in global food and agriculture governance. Based on the strategic opportunities of China-Africa agricultural science and technology cooperation, this paper analyzes the current situation from the scientific research platform construction, project cooperation, technology demonstration and human resource training, and points out the shortcomings in cooperation mechanism, technology promotion depth, high-tech, sustainable effectiveness, etc. The countermeasures and suggestions are as follows: Innovating the cooperation mechanism, enriching the cooperation mode, strengthening the technology promotion, expanding the cooperation field, improving science and technology, promoting the combination of science and technology with industry, as well as the personnel training and capacity building.

  The Influence Path of Land Transfer Years on Integrated Agricultural Efficiency of Family Farms Jin Xinting, Meng Zhixing, Meng Huisheng 2021, 11 (8):  104-109.  DOI: 10.11923/j.issn.2095-4050.cjas2021-0069 Abstract + ( 387 )   HTML ( 9 )   PDF ( 1264KB )   ( 344 ) The stability of farmland property rights is an important foundation for the development and expansion of family farms. Based on the survey data of 400 family farms in Yuncheng, this study used the mediating effect model to predict the influence path of the transfer years of land management rights on integrated agricultural efficiency. It is found that the stable farmland management tenure can significantly improve the integrated agricultural efficiency. The term of land transfer mainly affects the integrated agricultural efficiency of family farms through the two intermediary variables of land transfer price and whether to buy agricultural machinery. That is to say, the integrated agricultural efficiency is improved by reducing the land transfer price and purchasing agricultural machinery services. The effect of peasant household’s internal self-service level on integrated agricultural efficiency is stronger than that of outsourced agricultural machinery service. Therefore, this study proposes to improve the land contract right transfer market, raise the level of social security for migrant workers, increase subsidies and promote the construction of a self-service mechanism for agricultural machinery.

  Analysis of the Current Situation and Problems of E-commerce of Agricultural Products of Agricultural Business Entities Lv Dan, Jiang Mengmeng 2021, 11 (8):  110-115.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0091 Abstract + ( 630 )   HTML ( 16 )   PDF ( 1386KB )   ( 802 ) The article firstly sorts out the current situation of new agricultural business entities such as family farms (large and specialized agricultural family operations), specialized farmers’cooperatives and agribusinesses' carrying out e-commerce of agricultural products. It summarizes the characteristics of various types of e-commerce of agricultural products and the e-commerce models. Secondly, from two aspects of objective conditions and subjective consciousness, the key factors restricting the development of new agricultural business entities to carry out e-commerce of agricultural products are analyzed. Finally, relevant countermeasures are proposed from the perspective of government management and new agricultural business entities. At the level of government management, efforts should be made to improve the status quo from the aspects of talent training, smart logistics, precise governance, and third-party services. At the level of new agricultural business entities, the suggestions given are accurate brand positioning, standardization of production processes, visualization of production processes, diversification of marketing models and standardization of product packaging, and give full play to the leading role of new agricultural business entities in promoting the development of agricultural product e-commerce and agricultural modernization.

  An Evaluation of Agricultural Economic Development in Contiguous Poverty-stricken Areas in Shanxi Province Based on Principal Component Analysis Yang Xiaohui, Du Rong, Qin Ruimin, Xu Manhou 2021, 11 (8):  116-124.  DOI: 10.11923/j.issn.2095-4050.cjas2020-0226 Abstract + ( 449 )   HTML ( 12 )   PDF ( 1460KB )   ( 396 ) Lvliang and Taihang, two concentrated and contiguous poverty-stricken areas in Shanxi Province, are the main targets for poverty alleviation of China. In this paper, 21 state-level special poverty-stricken counties in 4 cities of these areas were taken as the research objects. The agricultural economic data of the study areas from 2008 to 2018 were obtained from the Statistical Yearbook of Shanxi Provincial Bureau of Statistics and the Poverty Alleviation Office of the State Council. The principal component analysis method was used to evaluate the agricultural economic development, in order to explore the spatial and temporal distribution characteristics of agricultural economic development and their relationship with poverty in concentrated and contiguous poverty-stricken areas in Shanxi. The results show that there are regional differences in the agricultural economic development level between Lvliang and Taihang, and the agricultural economic development has been improved with the passage of time. However, farmers’ extensive use of backward agricultural machinery in agricultural production has reduced their enthusiasm for production, resulting in a decrease in the total agricultural output value. The application of excessive chemical fertilizer in agricultural planting has led to poor soil quality and crop yield decrease, and further aggravated poverty. Therefore, when targeted poverty alleviation is carried out in concentrated and contiguous poverty-stricken areas, it is necessary to “implement policies according to local conditions and time”, change the traditional backward agricultural production mode in these areas, and take a green, inclusive and sustainable agricultural economic development road.