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- Abstract：To understand the promoter differences of ω-gliadin gene cluster in hexaploid wheat, the coding region along with the promoter sequences of ω-gliadin in hexaploid common wheat cultivar ‘Fielder' were obtained by homologous cloning. Bioinformatics analysis was conducted. The results showed that: 1)A total of 11 different ω-gliadin gene sequences were acquired, and six of which belonged to the ARE/Q type genes, the rest five were SRL type genes. 2)The coding region lengths were varied from 972 to 1 158 bp among the six ARE/Q type genes and from 1 303 to 1 419 bp among the five SRL type genes, which were the results of differences in types and quantities of Indels in the center repeat region. 3)There located a conserved typical endosperm box at -300 bp upstream of ARE/Q type ω-gliadin genes. Nevertheless, the endosperm box appeared at -300 and -600 bp upstream of SRL type ω-gliadin genes, respectively. The differences in the promoter of ω-gliadin gene cluster might influence the expression levels of different ω-gliadin genes.Keywords：wheat;A-PAGE;gliadin;promoter;endosperm box4|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This study aims to determine the effects of different shading and nitrogen application rates on grain filling characteristics of winter wheat, and to provide theoretical basis for high yield and high efficiency cultivation of wheat under “Fruit-Wheat” intercropping mode in Southern Xinjiang. ‘Xindong 20'was used as experimental material. Four levels of shading treatments(S0, S1, S2 and S3)were designed and four levels of nitrogen fertilizer(N0, N1, N2 and N3)treatments were set at the jointing stage(after shading)to analyze that effect of different shading and nitrogen application rates on the grain weight and grain filling characteristics of winter wheat. The results showed that: The effects of shading and nitrogen application rates had an extremely significant effect on 1 000-grain weight of wheat, and the effect of shading on 1 000-grain weight was greater than that of nitrogen application. Correlation analysis between grain filling parameters and 1 000-grain weight indicated that 1 000-grain weight was positively correlated with grain filling rate and stage grain accumulation, and negatively correlated with grain filling duration. Under the conditions of no shading(S0)and slight shading(S1), the grain filling rate increased and then decreased with the increase of nitrogen application rates and it decreased with the increase of shading extent. The grain filling duration prolonged with the increase of shading extent and nitrogen application rates. The grain weight at growth stages and 1 000-grain weight of N2S1 treatment were higher than those of other treatments(except N0S1). The grain filling rate decreased with the increase of shading extent and nitrogen application rate under the moderate shading(S2)and severe shading(S3)treatments. Although the duration of rapidly and slowly growth stages were prolonged, the grain weight at growth stages and 1 000-grain weight decreased with the increase of shading extent and nitrogen application rate. Therefore, under the slight shading(shading at jointing stage-heading stage 10%, shading at heading stage-maturity stage 25%), the declining grain filling rate caused by shading can be compensated by increasing application of nitrogen fertilizer to prolong the filling duration at the gradually, rapidly and slowly growth stages, thus increasing the grain weight of wheat. Under the conditions of moderate shading(shading at jointing stage-heading stage 20%, shading at heading stage-maturity stage 50%)and severe shading(shading at jointing stage-heading stage 30%, shading at heading stage-maturity stage 75%), the duration of rapidly and slowly growth stages prolonged more than 103. 5 kg/hm2 of pure nitrogen at jointing stage. However, it was unable to make up for the reduction of grain filling rate caused by shading and nitrogen application rates, and finally led to the decrease of grain weight at growth stages and 1 000-grain weight.Keywords：shading;nitrogen fertilizer;grain weight;grain-filling characteristics;wheat2|8|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In this study, the effects of single and combined bioactive substances(Seaweed extract, humic acid, diethyl aminoethyl hexanoate and brassinosteroid)with different concentrations on maize were compared by seed germination experiments. And their effects on improving the salt resistance were then analyzed. The results showed that: With the increasing of the bioactive substances concentration, the germination of maize seeds and seedling growth showed a trend of first increasing and then decreasing. The optimal concentration range were 8-10 mg/L diethyl aminoethyl hexanoate, 0. 50-1. 00 mg/L brassinosteroid, 200-400 mg/L seaweed extract, 10-15 mg/L Humic Acid, 0. 50-1. 00 mg/L brassinosteroid and diethyl aminoethyl hexanoate compound and 0. 10-1. 00 mg/L brassinosteroid and humic acid compound, respectively. Among them, the compound brassinosteroid and diethyl aminoethyl hexanoate had the best growth promoting effect on radicle, and the compound brassinosteroid and humic acid promoted the growth of hypocotyls best. All the tested bioactive substances could significantly improve the salt tolerance of maize seeds, of which brassinosteroid was the most effective one. In summary, the application of a suitable concentration of bioactive substances helps to promote the germination and root growth of maize seeds. Not only does the length of the main root increase, but the number of lateral roots also increases significantly, thereby improving its salt tolerance.Keywords：maize;bioactive substances;seed germination;growth promoting;salt tolerance3|9|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To understand the research status of maize lodging problem, relevant domestic and foreign literatures from 1984 to 2019 were analyzed and summarized. The lodging resistance identification indexes and evaluation methods were compared. The results showed that: There were a number of factors affecting maize lodging, from the heredity of internal varieties to the external environment, and from tillage and cultivation measures, which respectively affected lodging at different degrees. Therefore, the establishment of simple and efficient cultivation technology system and innovation of anti-lodging high-quality germplasm became particularly important. The accuracies obtained by different methods of identification and evaluation of anti-lodging were not the same, the principle of each method should be fully understood and appropriate estimation methods should be selected. At present, the establishment of lodging model and the intelligent remote sensing method has made rapid progress in prediction and monitoring of maize lodging. In the future, the digital lodging prediction and early warning system should be established based on good fields, good seeds and good methods to comprehensively solve the lodging problem in maize production.Keywords：maize lodging resistance;stem characteristics;evaluation method;regulation methods;maize6|13|15<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The self-made hydroxypropyl methyl cellulose boron-containing superabsorbent resin was used as test material. Through rapeseed seedling test, single factor and orthogonal test methods were used to investigate whether boron-containing super absorbent resin could improve the physical and chemical properties of seedling substrates and water retention and promote the growth of rapeseed seedlings. The results showed that the boron-containing superabsorbent resin changed the physicochemical properties of the substrate. With the increase of boron-containing superabsorbent resin, the bulk density of matrix decreased gradually, the total porosity and water-holding porosity increased gradually, the aeration porosity increased first and then decreased, pH, EC value and the effective boron content increased gradually. At the same time, with the extension of seedling time, there was a positive correlation between the relative water content of different treatment groups and the amount of boron containing superabsorbent resin. Therefore, within the appropriate range, the increase of the application amount of boron containing superabsorbent resin promoted the growth of rapeseed seedlings, but when the application amount was too large, it would hinder the normal growth of rapeseed seedlings. The suitable amount range of boron-containing superabsorbent resin was about 0. 3% of the mass of seedling substrate.Keywords：rapeseed seedling;boron-containing superabsorbent resin;boron slow-release property;physicochemical properties of substrate4|9|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
Advances in scientific research on sweet potato during the period 2000-2019: A bibliometric analysis
Abstract：This study aims to understand the status and trends of sweet potato(Ipomoea batatas L. )research through bibliometrics and provide scientific references for sweet potato researchers and policy-makers. Based on Web of Science(WoS)and CNKI database, articles related to sweet potato were searched from 2000 to 2019. Bibliometric analyses were performed to determine the indicators of scientific productivity, countries, institutions, authors, highly cited papers and journals. The results showed that: China was very active in the research field of sweet popato and ranked the first in the world in terms of the number of published papers and institutions, as well as the scholars. However, the academic quality of the articles published by Chinese scientists was not consistent with the quantity. There were gaps in the frequency of citation, H index or the number of high cited papers compared with those of the United States and Japan. There were no high quality academic journals with international competitiveness and influence from China, which did not match the status of scientific research ability. The main research subjects were crop science and food science. The purple sweet potato, starch, and anthocyanins were the research hotpots. The purple-fleshed sweet potato and leaf-vegetable sweet potato will be the most important research topics in the future.Keywords：sweet potato;bibliometric;Web of Science;CNKI;citation analysis2|10|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27- Abstract：In order to realize the plan of reducing the application of orchard chemical fertilizer, a high-efficiency microbial phosphate fertilizer was developed. In this study, organophosphorus mineralized bacteria were screened from apple rhizosphere soil by Monggina organophosphorus solid medium. The efficiency of mineralized calcium phytate was identified after isolation and purification. Meanwhile, the pH and phosphatase activity of the culture medium were measured, and 16S rDNA sequencing analysis was used to identify the strain classification information. Finally, it was transplanted to organophosphorus medium to observe its effect on Arabidopsis thaliana growth. The results showed that: A total of 10 strains of phosphorus-extracting bacteria from rhizosphere soil of apple were isolated and purified, which had different phosphorus extracting abilities. Their phosphorus dissolving capacity ranged from 14. 82-104. 13 mg/mL, and phosphatase activity varied from 12. 61-44. 24 μg/(mL·h). According to the identification, the 10 strains belong to three genera of Acinetobacter, Enterobacterer and Pseudomonas, respectively. Based on the analysis of physiological characteristics and evolutionary tree, PsbM4 was finally screened out as a better candidate for phosphorus dephosphorization bacteria in apple rhizosphere. And it could promote the growth of A. thaliana. l fertilizer to improve the plant's ability to absorb phosphorus provides a scientific basis.Keywords：apple;rhizosphere soil;screening and identification;phosphate-solubilizing bacteria;phosphatase activity5|9|13<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This study sorted out the research hotspots of coal-mining subsidence by CiteSpace software: Foreign countries focus on the mining area environmental assessment, backfill material update and surface morphological changesthe ecological restoration technologies in this field in China are classified and evaluated. 1)Soil reconstruction and geomorphology remodeling technology. The technology continues to innovate from filling materials, soil remodeling methods, and restoration concepts, and the technology research will shift to more efficient, green, and economical in the future. 2)Soil remediation technology. In the future, it should continuously expand the screening and matching of composite strains, microbial remediation ecological risk assessment and plant-microbe associated bioremediation technology. 3)Landscape reconstruction technology. The model of this technology is diverse, and it is urgent to promote the landscape reconstruction technology to be more systematic, global, and modular. In view of the shortcomings of the current research, the ecological restoration of coal-mining subsidence area should be improved in the theoretical research, innovative joint repair methods and post-repair monitoring technology.Keywords：coal mining subsidence;ecological restoration;soil remodeling;soil remediation;landscape reconstruction6|10|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
Study on the water optimal allocation in irrigation district based on considering soil water balance
Abstract：Due to the shallow groundwater depth, the high salinity of groundwater and the decreasing of water amount in the Yellow River year by year, there is a serious shortage of agricultural water in the Jiefangzha irrigation district, Hetao Irrigation District, Inner Mongolia. Aiming at this problem, this study builds an irrigation water resources optimization model by integrating the Jensen model and soil-water balance model and maize in the Jiefangzha irrigation district is taken as study object. Agricultural water optimal allocation schemes are generated under different scenarios of groundwater depths and soil water contents. Lingo software programming is used to the developed model. The results show that: When the local water depth is 2. 5 m, the amount of optimal irrigation water is 3. 85×108 m3, which achieves a net economic benefit of 5. 55×108 yuan. When the soil water content is within the range of 0. 12-0. 16, the net economic benefit is ［5. 41, 5. 67］×108 yuan. The optimization results indicate that the model is feasible and can provide 14 water allocation schemes under different soil water content locally and groundwater depth scenarios in the Jiefangzha irrigation area of the Hetao Irrigation District.Keywords：water resources optimal allocation;soil water balance;Jiefangzha area;Jensen model5|8|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27- Abstract：In order to study the response of gross primary productivity(GPP)to regional precipitation, this study analyzed the GPP of Kashgar, Aksu and Hotan in Southern Xinjiang from 2000 to 2014. The spatial and temporal distribution of GPP were obtained and coupled with the precipitation over the same period to explore the responses of GPP to precipitation in order to provide a basis for the ecological maintenance and sustainable development of vegetation in Southern Xinjiang. The results showed that: 1)GPP presented seasonal fluctuations. The annual average GPP peak point basically appeared in July of each year. 2)In terms of spatial distribution, GPP in Hotan presented low value in north and high value in south, while GPP in Aksu presented high value in north and low value in south where there was a large difference in numerical values. GPP in Kashgar was the same as that of Aksu, but the distribution of GPP in the northwest was relatively concentrated and had a relatively high value. 3)As for the trend, GPP in Hotan displayed an increasing trend, GPP in Aksu was relatively stable, and GPP in Kashgar was on the rise. 4)There was a positive correlation between GPP and precipitation in the study area. When the precipitation lagged behind for one month, the correlation coefficient in Hotan and Kashgar was significantly improved, but the Aksu region didn't show the lagging effects, indicating that the response relationship was more obvious.Keywords：Southern Xinjiang;gross primary productivity;spatial-temporal variation;vegetation ecosystem;response relationship2|8|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to study the gene editing of goat milk protein and realize the “humanization” transformation of goat milk, the β-lactoglobulin(BLG)gene was knocked out and the human lactoferrin(hLF)gene was knocked in at BLG locus in goat by CRISPR/cas9 system. A sgBLG/Cas9 expression vector for goat BLG exon Ⅰrecognition site was designed and constructed, which was electrotransfected into the goat fetal fibroblast cells to verify the editing activity. The vector BLC14 and sgBLG/Cas9 were co-transfected into goat fetal fibroblasts, and the BLG-/hLF+ targeting cells were chosen as donor cells for goat somatic cell nuclear transfer. The cloned fetus was obtained by cesarean section and the target condition was verified. The results showed that: The mutagenicity of sgBLG/Cas9 editing goat BLG locus was 25%-30%; A totoal of 72 G418-resistant cells were screened, 37 of which were gene targeting cells, and the targeting efficiency was 51. 4%(37/72); In this study, seven gene target cells having better morphology appearances were selected for nuclear transplantation, and 416 reconstructed embryos were transferred into 30 recipient goats. There were 13 pregnancies confirmed by B-ultrasound in 30-35 days, and pregnancy rate was 43. 3%(13/30). All three 35-day-old cloned fetuses by cesarean section, and they were all identified as BLG-/hLF+ genotype and the targeted modified cell lines were established. In conclusion, the hLF gene knock-in at BLG locus of goat could be obtained by CRISPR/cas9 system, which provided a scientific basis for cultivating transgenic goat lines of low allergen and rich hLF in the milk, and also laid a foundation for milk protein gene editing and molecular genetic breeding.Keywords：CRISPR/Cas9;β-lactoglobulin;human lactoferrin;gene targeting;nuclear transplantation2|9|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To study the effect of the envelope(env)of Jaagsiekte sheep retrovirus(JSRV)on the proliferation of NIH3T3 cells(mouse embryo fibroblast cells), pCMV-dR8. 91-JSRV-env lentiviral overexpression vector was constructed and infected with NIH3T3 cells. The JSRV-env gene was ligated into the red fluorescent lentiviral reporter vector pCMV-dR8. 91, and the gene was correctly sequenced and named pCMV-dR8. 91-JSRV-env. The pCMV-dR8. 91-JSRV-env recombinant plasmid and packaging helper plasmid were co-transfected into HEK 293T cell packaging to produce recombinant JSRV-env lentivirus. The recombinant lentivirus suspension was concentrated by ultracentrifugation, and the virus titer was determined by real-time PCR. After the concentrated virus transduced NIH3T3 cells for 72 h, thiazole blue(MTT)was used to detect cell proliferation. The results showed that: env gene was completely and correctly recombined into the pCMV-dR8. 91 vector by sequencing; pCMV-dR8. 91-JSRV-env was co-transfected with packaging helper plasmids into 293T cells for 72 h. Real-time PCR verified that JSRV-env was very significantly overexpressed(P<0. 01)and the average titer of JSRV-env lentivirus was 2. 99×108 IU/mL; MTT analysis showed that infection of NIH3T3 cells by 10 μg JSRV-env lentivirus for 72 h significantly promoted the proliferation of NIH3T3 cells(P<0. 05). In conclusion, the JSRV-env lentiviral overexpression vector was successfully constructed, and JSRV-env can promote the proliferation of NIH3T3 cells.Keywords：Jaagsiekte sheep retrovirus;envelope protein;lentivirus;cell proliferation;pathogenic mechanism1|7|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to investigate the microbial pollution in the nipple watering system in the layer houses, the bacterial contents in the pipe water and the V-trough on the 1st, 3rd, 5th, 7th tier of the layer house with eight overlap tiers were continuously monitored, respectively. The bacterial contamination and its association with laying performance and egg quality traits were compared. The number of bacterial genome 16S rDNA copies was detected by real-time PCR. The results showed that: There was no significant difference in the number 16S rDNA copies in both pipe water and V-trough among tiers(P>0. 01), while the number in the V-trough was 46. 77-1 905. 46 times higher than that in the pipe water(P<0. 01)of each tier throughout the experiment. The V-trough on the 7th tier had the lowest 16S rDNA copy number of bacteria, but had the highest laying rate, albumen height and Haugh unit of the layers. The 16S rDNA copy number of bacteria in the pipe water was positively correlated with that in the V-trough on different tiers(correlation coefficient, r=0. 078-0. 183). The 16S rDNA copy number in V-trough was weakly negatively correlated with laying rate and egg weight on the 3rd, 5th and 7th tier(r=-0. 305 - 0. 127, -0. 164 - 0. 060), and weakly negatively correlated with albumen height and Haugh unit(r =-0. 192 - 0. 037, -0. 138 - 0. 047)on each tier. In conclusion, the bacteria content in the V-trough was much higher than that in the pipe water indicating a higher level of pollution, which might have potential negative impacts on the health, laying performance and egg quality of laying hens.Keywords：layer house;nipple watering system;V-trough;bacteria content;laying performance1|8|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to deeply understand the research contents and key technologies of yield sensing, yield mapping and dynamic model, the research results of yield sensing, yield mapping, dynamic model of grain flow and errors in yield sensing were sorted out. This review mainly summarized the classification of yield measurement methods. The principles of different yield sensing, the key technologies involved in yield mapping and the results obtained from the dynamic model were introduced. The test results and the advantages and disadvantages of the yield sensing were compared. The error sources of yield sensing, yield mapping, moisture sensors, cutting width sensors and GPS positioning device were analyzed. The results show that: 1)Reasonable installation, calibration and operation of production measuring devices in different ways can make the production measurement results achieve enough accuracy. It is suggested to strengthen error analysis of different production measuring methods and improve test accuracy. 2)Some errors in the yield mapping can be reduced or even eliminated by calibration, but the production plot construction and error research based on small plots need to be strengthened. 3)The first-order dynamic model cannot determine the impact of grain mixing on yield monitoring. Therefore, research on the dynamic model based on nonlinear combination algorithm and deconvolution algorithm should be strengthened.Keywords：precision agriculture;yield monitor;yield map;yield reconstruction;grain flow model;error analysis0|8|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to understand the consistency between cognition and behavior of producers' quality control, based on the survey data of Xinjiang, Inner Mongolia and Qinghai, this study tested the consistency and explored the motivation. The results showed that: The cognitive level of quality control was low, but the use of quality control behavior was good and the correlation between the two was weak; The higher specialization degree of framers, their participation in breeding cooperatives, signing sales contracts and quality and safety inspection were helpful to improve the cognitive and behavior level of farmers on quality control; Higher education level helped to enhance their cognition of quality control, and participation in cultivation technology training helps farmers to improve the behavior of quality control. In conclusion, it is necessary to strengthen the cultivation and improvement of new management subjects and pay more attention to the cooperation between the main body of mutton sheep breeding and the role of cooperative organizations, and improve the quality supervision system of the combination of mutton sheep and mutton market with the government and relevant departments.Keywords：quality control cognition;quality control behavior;consistency;mutton sheep;influencing factors0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to explore the effect of urbanization on Chinese citizen's liquid milk consumption, based on the perspective of migrant workers, this study uses cross-sectional data of 5 provinces in China and Heckman's two-step model to analyze the impact channels. The results suggested that income, market maturity and consumption habit contributed to the increase of milk consumption in the process of urbanization. And the effect the three factors increased progressively. In more developed districts, the effect of consumption habit was more important. In less developed districts, the effects of income and market maturity were more important. The selection process of milk consumption was the key factor influencing average consumption level. Compared to rural residents, the migrant worker's consumption habit was approaching that of city residents. In conclusion, this study predicts the growth of milk consumption in China. Developing citizen's consumption habit, decreasing rural-urban gap and enhancing migrant worker's welfare are important ways to promote milk consumption in China.Keywords：milk;urbanization;migrant worker;consumption0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the multiple factors affecting the food recall initiation time, the recall events that occurred in US listed food companies from 1994 to 2017 are taken as study objects. A multiple linear regression model is constructed, and the influential factors of food recall initiation time are empirically analyzed. The results show that the main influencing factors of the recall initiation time are recall volume, distribution scope and recall reasons(bacterial infection and extraneous matter contamination). Among them, recall amount has significant positive influence on recall initiation time; the smaller the distribution range, the shorter the recall initiation time is. When the recall is caused by bacterial infection or extraneous matter contamination, the recall initiation time is relatively shorter. The recall subject has no significant influence on the recall initiation time. In order to improve the food recall system in China, countermeasures such as strengthening food HACCP certification, improving food safety traceability supervision system and establishing a special reserve fund system from the levels of companies, supply chains and governments are proposed in this study.Keywords：listed food companies;food safety;food recall;recall initiation time;recall number1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to further explore the development level of regional agricultural products e-commerce and its influencing factors, this study constructs a county-level agricultural product e-commerce evaluation index system from the perspective of information technology, and uses DEA-Tobit model to measure the development of agricultural products e-commerce performance and key influencing factors of 38 counties in Chongqing in 2018. The ISM model is then used to reveal hierarchical logic relationships between different elements. The results show that: 1)In 2018, the development of agricultural products e-commerce in Chongqing is at medium level, and there is gap between different regions; 2)Chongqing has the highest level of development performance from the southwest to the northeast along the Yangtze River, and it is gradually decreasing from the northwest to southeast, forming a spatial pattern of “high on intermediate and low on both sides”; 3)The scale of agricultural product e-commerce construction is more significant than the agricultural product information technology production on the development of agricultural products e-commerce, in which the use of information technology in agricultural products such as open-air and greenhouses is negatively affecting performance. At the same time, the information technology level of agricultural products in livestock and poultry farming is positively transforming the execution of e-commerce; 4)The proportion of e-government administrative villages is the core factor affecting the development of e-commerce in county-level agricultural products. In the future, Chongqing still needs to adhere to the guidance of local governments and information technology to build a “one village-one product” quality agricultural product, expand the scale of e-commerce infrastructure for agricultural products, optimize resource allocation, reduce the cost of information search in the circulation of agricultural products, and thus improve the overall level of regional e-commerce development of agricultural products.Keywords：agricultural product e-commerce;county performance evaluation;spatial layout;influencing factors;Chongqing4|10|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the stochastic frontier production function, the substitution elasticity of agricultural land, labor and capital in both Beijing and its supply regions are estimated and the influencing factors of the substitution relationships are analyzed by using the seemingly unrelated regression estimation model, which forms the production potential. The results show that: There are substitution effects among factors, among which land is relatively flexible for substitution of other factors, while capital is inelastic for substitution of other factors. Production factor substitution reveals the characteristics of technology selection. Farmers in essence reflects the farmers agricultural production potential, through the analysis of element substitution and influence factors of farmers can be quantized, for farmers at a disadvantage of factor endowments, such as less labor resources, vegetables in small proportion in the total revenue, income from its production potential is more than capital inputs. For farmers with advantages in factor endowment, e. g. , higher education and training in vegetable cultivation, their production potential is more likely from land input.Keywords：production factor substitution;stochastic frontier production function;seemingly unrelated regression estimation model;production potential2|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the rational screening of control variables and the subdivision of livelihood strategies, using the two panel data of CFPS, this study employs a DID and PSM-DID model to analyze the influence of land renting-out on households' livelihood strategies. The results reveal that: The land renting-out behavior has a significant negative effect on farmers' adoption of agricultural and agricultural part-time livelihood strategies, and has a positive effect on the choice of non-agricultural livelihood strategies. However, its impact on the non-agricultural part-time livelihood strategies shows limited effects and did not pass the significance test. These results indicate that farmers can adjust their own livelihood strategies to adapt to the changes caused by the land renting-out. In addition, the estimation results are tested by a variety of matching methods to confirm the stability and reliability of the main estimation results. It is suggested that in the future, on the basis of respecting the wishes of farmers, the support for the farmland transfer policy should be increased. At the same time, according to the actual needs of different types of farmer households, differentiated incentive policies should be suitable for their own development to realizing the sustainable livelihood construction for land renting-out family to follow.Keywords：rural household;land renting-out;livelihood strategy;DID model1|9|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on the survey data of 1 088 farmers in Hubei Province, by combining the personal characteristics with family characteristics of farmers, this study analyzes the influence of risk perception and public image appeal on farmers' acceptability of green agricultural technology by using Ordered-Probit model. The results show that: 1)The acceptability of green agricultural technology by farmers was not ideal, in which the number of years of education displayed significant positive impact. But the risk perception and public image appeal had significant negative impact; The stronger the public image appeal of farmers and the weaker the sensitivity of farmers' risk perception, the weaker the negative impact on farmers' acceptability of green agricultural technology was; 2)There were differences in the influence of risk perception and public image appeal on the acceptability of green agricultural technology by different types of farmers. Risk perception and public image appeal mainly affect the acceptability of green agricultural technology of full-time farming households and part-time farming households II, while the acceptability of green agricultural technology of part-time farming households I and non-farming households were mainly affected by the public image appeal. In conclusion, the government should strengthen the applicable reliability of green agricultural technology, and stimulate the appeal of farmers' public image, and put forward targeted adoption measures according to the characteristics of different types of farmers, so as to improve farmers' acceptability of green agricultural technology and guide farmers to carry out agricultural green production.Keywords：risk perception;public image appeal;green agricultural technology acceptability;farmers differentiation2|8|9<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
