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- Abstract：To investigate the influences and mechanism of biochar amendment on wheat emergence and seedling growth in alkaline soil,two experiments were conducted in Wuqiao experiment station of China Agricultural University.The effects of different biochar application rates (0,0.6%,1.8%,3.6% and 5.4%) on wheat emergence rate,soil water content of wheat wilting and soil available water were investigated in the first experiment.The results showed that biochar inhibited the emergence of wheat.With the increase of application rates,the emergence rate and soil available water decreased while soil water content of wheat wilting increased.The effects of biochar application on seedling growth,soil pH and EC were studied under three water levels of 30%-50% (WL),50%-70% (WF) and >70% (WE) in the second experiment.The results showed that excessive application of biochar (>3.6%) inhibited the growth of wheat seedlings under all water levels.Soil pH under WF and WE water levels,soli EC under all water levels were negatively correlated with root activity,plant water content and aboveground biomass.It was found that the application of biochar in alkaline soil increased the soil pH and EC,and thus inhibited the emergence and seedling growth of wheat.Keywords：biochar;soil pH;soil EC;wheat seedling growth9|10|8<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：An experiment was carried out to determine alkaline phosphatase-like activity in magnetosomes and whether the magnetosomes could act as the solid carrier of magnetic immune ELISA.The activity of the magnetosome and the commercial alkaline phosphatase was compared under different coloring time,temperature and pH.The results showed that the time used for the color development of commercial alkaline phosphatase was very short and sensitive.However,the temperature and pH had certain limitations.The trace of the magnetosome required long time in color development,temperature and pH had little effect on the color reaction of magnetosome.Moreover,the location of the magnetophilic alkaline phosphatase on magnetosome was preliminarily determined by the treatment of different protein denaturants.Based on these findings,it was concluded that the weak chromogenic ability of the magnetosome was not significantly affected when it was used for magnetic immunoassay ELISA.Therefore,the magnetosome could be used as a solid carrier for magnetic immune ELISA.Keywords：magnetosome;solid phase carrier;alkaline phosphatase;magnetic immune ELISA;magnetotactic bacteria2|10|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To study the expression and function of LEAFY in process of flower bud differentiation into sweet cherry,the full-length cDNA encoding LEAFY was obtained from the flower bud of the sweet cherry (Prunus avium L.) ‘Hongmi’ and amplified by homologous cloning and rapid-amplification of cDNA ends (RACE).LEAFY expression in the process of bud differentiation was identified by real-time fluorescence quantitative PCR (qRT-PCR).The results showed that there were 3 length types LEAFY in ‘Hongmi’,which were 1 532,1 498 and 1 410 bp respectively.The length differences were mainly caused by different length of 3'UTR regions,containing a 1 233 bp open reading frame (ORF),which encoded a protein of 410 amino acids and had more than 70% amino acid sequence similarity with LEAFY homologous protein in other plants.The deduced protein molecular weight was 45.6 ku and its theoretical isoelectric point was 6.88,namely PaLEAFY.Real-time RT-PCR analysis indicated that:After fruit mature till 33 days,PaLEAFY expression changing trend was from high to low in flower bud.And at 45 days after fruit mature.PaLEAFY expression began to rise and maintained still till 69 days after fruit mature,then rose again at 69 days after fruit mature and reached highest at 99 days after fruit mature.In addition,the expression of PaLEAFY gene in stem and leaf were lower than that in the flowers.The expression of PaLEAFY was highest in stigma,and then were petal,stamen and sepal of flower suggesting that PaLEAFY was involved in flower bud differentiation and floral development process in sweet cherry.5|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to systematically evaluate the phenotypic characteristics,active components contents,and antioxidant activities of male flowers of different Diospyros materials,8 kinds of materials were measured by spectrophotometric and HPLC methods.The results showed that high degree and great range existed in phenotypic characteristics,with the coefficient of variation ranging from 0% to 61.37%,with 54.95% on average.There were significant differences in flavonoids,polyphenols,tannin and vitamin C contents,with the coefficient of 51.65%、40.19%、18.87% and 109.10%,respectively.The antioxidant activities including DPPH·,ABTS+·scavenging ability,Fe3+ and Cu2+ reducing ability,the chelating ability of Fe2+ and Cu2+ was excellent,and they were significantly correlated with active components and no significant correlation with phenotypic characteristics.According to principal component and cluster analysis,three principal components with the cumulative contribution rates reaching 78.900% were obtained from twenty tested indexes.In addition,the eight materials were divided into four groups and selections should be made according to different targets for development and utilization in the further.Keywords：male flower;Diospyros;active components;antioxidant activities;correlation;principal component analysis5|11|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to optimize transformation system and obtain stable transgenic plants,the effects of Agrobacterium tumefaciens strains,carnation genotype,the number of pre-culture days,the way of infection,the mode and time of co-culture on the leaf genetic transformation of carnation were studied.The optimized carnation transformation system was as follows:Shaking with Agrobacterium tumefaciens buffer for 12 min (200 r/min) and standing for 3 min after 2 d pre-culture;Then co-culture for 5 d on three-layer sterile filter paper soaked with 50 μmol/L AS solution.The results of different genotype comparion showed that the differentiation rate of resistant buds of ‘Mallow Titanium Alloy’ was higher than ‘Master’ and ‘Pink Shirt’.Treatment of 60 mg/L Kan had good select effect for all carnation genotypes.Medium of 0.5 mg/L IBA + 0.22 mg/L TDZ was direct germination medium with high differentiation efficiency,high budding rate and good growth status.Optimum genetic transformation system of carnation was established with high reproducibility,high transformation efficiency and low genotype dependence in this study. DcaPIP1;1 gene transformation efficiency was improved by using this system.Keywords：carnation;agrobacterium-mediated;genetic transformation system;high efficiency7|12|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this study was to investigate the biological characteristics and provide references for Stenotrophomonas maltophila identification,diagnosis and treatment.The dyeing characteristics and culture characteristics of the isolate was observed and identified by biochemical tests.To determine LD50 of the isolate in mice,drug sensitive test was conducted to analyze the toxicity and drug resistance.A system evolutionary tree was built based on the result of 16S rRNA gene sequence analysis.The results of the 16S rRNA sequencing of the isolated strain showed 99% homology with S.maltophila.The colonies of the isolated strain on TSA agar appeared to be smooth, circular and translucent and had α-hemolysis on blood agar.The LD50 of isolated strain to mice was 6.62×107 cfu per mouse. The results of antibiotic sensitivity experiment showed that it was sensitive to cephalosporin antibiotics but insensitive to quinolone,tetracycline,cephalosporin antibiotics,carbapenems and aminoglycoside antibiotics.In conclusion, this pathogen was identified to be S.maltophila.In addition,it was proved to have strong pathogenicity and powerful drug resistance.This study provided references for the clinical diagnosis,disease prevention and drug treatment of associate streptococcus disease.Keywords：Stenotrophomonas maltophila;16S rRNA;isolation and identification;zoonosis4|9|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The repetitive data of staple length (natural length) of 54 044 Inner Mongolia White Cashmere goats from 1990 to 2014were collected in a breeding farm.The staple length of Inner Mongolian Cashmere goats were divided into three types:Short-staple length (≤ 13 cm,SSL),intermediate-staple length (>13 cm and ≤ 22 cm,ISL) and long-staple length (>22 cm,LSL).After the basic statistical analysis of different hair length,it was found that there were significant differences in staple length among Inner Mongolia Cashmere goats.The staple length was ranged from 5 to 34 cm,and the distribution of staple length was consistent with the normal distribution.The average information restricted maximum likelihood (AIREML) method in a multivariate animal model on wombat software was used to analyze variance components and estimate the genetic parameters to reveal the staple length genetic regularity.The result showed that:the heritability of SSL,ISL and LSL were 0.11,0.16 and 0.22,respectively.The heritability of LSL was highest in three types.And the heritability of SSL and ISL belong to the low heritability,while the heritability of LSL was the moderate heritability.The genetic trends of all three types' staple length were consistent in both genetic progress and genetic progress.The result showed that LSL was most stable in the genetic progress.Genetic trends for SSL (0.005 9 cm/year),ISL (0.011 3 cm/year) and LSL(0.014 1 cm/year) was positive during the period of breeding.The genetic progress of the LSL3 was the fastest among three types.So,selecting of LSL3 could accelerate genetic progress.And this study lay the theoretical foundation for the indirect selection in other important economic traits.Keywords：cashmere goats;staple length;genetic parameters;genetic change5|7|5<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The objective of this study was to investigate the effect of dietary chitosan (CTS) levels on the growth performance and mechanism of dietary CTS levels on the hepatic lipid metabolism of geese.Three hundred and sixty 14-day-old healthy Yangzhou male geese were randomly divided into five groups with 6 replicates per group and 12 geese each.Geese were respectively fed with basal diet (control group),normal diet+250 mg/kg CTS diet (groupⅠ),normal diet+500 mg/kg CTS diet (groupⅡ),normal diet+1 000 mg/kg CTS diet (groupⅢ) and normal diet +2 000 mg/kg CTS diet (group Ⅳ) for fifty and six days,respectively.The results showed that:1) Supplement of 250-500 mg/kg CTS significantly increased ADFI and ADG and 70-day-old body weight (P<0.05);2) Compared with the control group,serum TC and LDL concentrations significantly decreased with supplement of CTS within 250-1 000 mg/kg range (P<0.05).Serum TG and HDL-C concentration had no significant difference among five groups;3) Supplement of 250-500 mg/kg CTS reduced ACC activity and the mRNA expression of ACC and FAS.The expression of PPAR-α was up-regulated with the increasing of CTS dose;4) The CTS dose had no significant effect on FAS and LPL activity in the liver (P>0.05).The HL activities of 500 and 1 000 mg/kg CTS groups were significantly decreased.In conclusion,supplemental CTS increased ADFI and ADG,decreased serum TC and LDL levels,affected liver lipid metabolism enzyme activity and related genes expression.The optimal dietary of 250-500 mg/kg chitosan in diet was recommended.Keywords：chitosan;goose;growth performance;serum lipid;gene expression10|12|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The aim of this study was to investigate the effects of curcumin on the total sugar,total phosphorus and anti-inflammatory factors in the serum of mice with mastitis caused by Staphylococcus aureus.By using ultraviolet spectrophotometry and turbidimetry,the effect of curcumin on the determination Staphylococcus aureus total sugar and total phosphorus release were tested.At the same time,a mastitis model was built and the ELISA kit was used to detect the changes of anti-inflammatory factors including interleukin 6 (IL-6),interleukin 8 (IL-8) and tumor necrosis factor-α (TNF-α).The results showed that:1)The inhibitory effect of curcumin at 1 MIC concentration on the total sugar and total phosphorus in the cell was better than that of curcumin at 0 MIC concentration displaying bacteriostatic effect.2)The concentrations of IL-6, IL-8 and TNF-α in the serum of the mastitis model mice were significantly decreased by curcumin,TRSDL and ciprofloxacin groups,while they were increased steadily in the negative control group.The curcumin showed inhibitory effect on Staphylococcus aureus,and it regulated the homeostasis of internal environment by inhibiting the expression of IL-6,IL-8 and TNF-α in the serum of mastitis model.Keywords：curcumin;mice;Staphylococcus aureus;mastitis;antibacterial;anti-inflammatory6|10|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Assessment of livestock and poultry excreta (LPE) resource is of great significance for environmental pollution control and organic waste recycle.Earlier researchers reported an excessively wide range of LPE produced in China and failed to reach unanimous conclusion.Current staus and research progress on LPE were summerized based on literatures published since 1995.Firstly,the LPE definition and its calculation parameters were clarified.Secondly,how to choose a correct quantity parameter from slaughter quantity,year-end live hogs quantity,and annual inventory quantity in the related stastical yearbook for various types of animal husbandry was discussed for LPE resource calculation.Thirdly,LPE resource calculation equitions were analysed and improved to take the factor of commercial scale husbandry coefficient and moisture into the consideration.Commercial scale husbandry coefficient values for all livestock and poultry were also decided.Forthly,in order to avoid the problem of repeated statistic data of slaughter quantity for pig,beef cattle and sheep,the annual inventory quantity was discussed and its calculation equition was establised based on the proportion of breeding population.Fifthly,reliability of data of LPE produced in China reported by previous researchers was analysed.It is suggested that the fresh LPE weight from individual and commercial scale husbandry (2.228 billion metric tons) in 2010 by Geng Wei et al.,the amount of fresh LPE from commercial scale husbandry (837 million metric tons) in 2009 by Tian Yishui and the dry weight LPE from individual and commercial scale husbandry (623 million metric tons) in 2009 by Jia Wei exhibited relatively higher reliability.Lastly,it was proposed that LPE potential resource,spatial distribution and development trend should be further assessed according to the improved definition and equitions in this study,and related industrial standardand physical and chemical properties should be studied in future.Keywords：biomass;animal waste production;livestock and poultry excreta;excretive coefficient9|12|15<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to investigate the responses of water and carbon fluxes of vineyard to irrigation,rainfall and frost as well as the differences between,a typical vineyard in arid northwest China was taken as example and successive observations on rainfall,irrigation and water and carbon fluxes before and after frost were conducted based on eddy covariance,stem flow gauge and micro-lysimeter in this study.The result showed the monthly mean daily variation of every parts of water and carbon fluxes.And It was also discovered that evapotranspiration (ET) of the vineyard increased quickly after rainfall and decreased slowly afterwards over time.The time of emergence of the peak value delayed from 14:00 to 15:00.But the grape transpiration increased very slowly.Vineyard ET increased first and then decreased step by step after reaching the peak after irrigation.The irrigation and rainfall both enhanced the carbon sink of the vineyard.Grape leaves almost died and transpiration decreased sharply (close to zero) after frost.And after frost,the fluctuation of net ecosystem exchange curve became smaller indicating that the vineyard turned into carbon sink period.7|12|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：By taking grassland patch of Hale Town,Wuchuan Country,Inner Mongolia in 2015 as research object,the grassland evaluation index of Farming-pastoral Zone was structured by the scale,distribution and shape of grassland.According to the standard of cultivated land per capita in 2020,the potential of land conversion was calculated,and the relationship between the comprehensive status of grassland landscape and the potential of returning farmland to grassland was discussed.The results showed that the scale of grassland in Hale Town was large and there were many dense area of grassland.The density of the grassland patch was influenced by the altitude and slope;The differences of grassland landscape among different villages were large:The grassland landscape in the northwest was small scale and high degree of fragmentation;In southeast area,the grassland landscape was large scale and had a higher degree of agglomeration;And the potential development areas were mostly located in the northeast and southwest edge of Hale Town.Keywords：farming-pastoral zone;grassland landscape;returning farmland to grassland;landscape index8|10|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to provide better greenway service for city residents,and to improve the public satisfaction of greenway resources,it was necessary to evaluate the suitability of the greenway based on the tourist experience and to improve the factors that affect the suitability of greenway.In this study,the suitability evaluations of urban greenway index system were established.The first level indicators,such as natural factors,landscape factors,greenway facilities and greenway management,were selected.And 19 secondary indicators,air and water quality,and quietness etc.,were also selected..Hefei Huancheng Park Greenway and Kuanghe Greenway were taken as research objects.Field research and questionnaires were conducted.The fuzzy comprehensive evaluation method (FCE) was used.The results demonstrated that:1) The weight analysis of the evaluation index showed that the natural factor (0.514 9) had the highest weight,which was the most important effect on the suitability of the greenway,which followed by the landscape factor (0.211 2) and the greenway facility (0.174 6).The greenway management (0.174 6) was the lowest;2) The comprehensive score of greenway suitability assessment of the Huancheng Park was 3.264 6,while the Kuanghe was 3.098 6.The evaluation score of Huancheng Park was higher than that of the Kuanghe;3) The greenway management scored both the highest of the two greenway suitability evaluation,followed by the landscape factors and the natural factors.The lowest scores of the suitability evaluation were the service facilities.Keywords：urban greenway;tourists experience;evaluation of suitability;Hefei City7|13|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Aiming at the problems of large energy consumption and serious pollution of corn drying,a continuous corn drying system of desiccant heat pump is designed and used in low temperature environment.The results show that:1) Multi-stage evaporating dehumidification and multi-stage condensation system can recovery the sensible heat and latent heat of the exhaust gas discharged from the drying tower.Compared with the conventional drying equipment,the heat pump drying equipment has higher efficiency,and the overall energy-saving is 30%.2) Of the traditional design,fresh air is heated and directly discharge atmosphere after finished heat exchange with corn which causes energy waste and the environment pollution by discharging brans with exhausted air.This drying system designed in this study is a closed-cycle structure which can have energy recovery of the air that discharged from the drying tower,no dust is released into the atmosphere and its energy-saving is obvious.Because of low drying temperature and uniformity of air flow,the quality of dried corn is improved obviously.Keywords：corn;drying tower;dehumidified heat pump;continuous drying5|12|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
Determination of corn stalk contact parameters and calibration of Discrete Element Method simulation
Abstract：To improve the accuracy of the discrete element method simulation of corn stalk,the contact parameters tests of corn stalk and the hammer of tearing choppers,corn straw and corn straw were conducted in this study.By using the average value of the radial stacking angle as evaluation index,the orthogonal method was used to calibrate the contact parameters of the corn stalk discrete element simulation input.The coefficient of restitution,coefficient of static friction and coefficient of rolling friction with corn straw and hammer were calibrated by discrete element simulation.The results of the optimal scheme were 0.663,0.226,and 0.119,respectively.In addition,the coefficient of restitution, coefficient of static friction and coefficient of rolling friction with corn stalk and corn stalk were set to 0.485, 0.142 and 0.078,respectively.The mean error value of discrete element simulation using this parameter combination was 8.127%.Keywords：rubbing machine;corn straw;Discrete Element Method;parameter calibration;coefficient of restitution;coefficient of friction36|29|39<HTML><L-PDF> <Meta-XML>Updated：2024-02-27- Abstract：In order to study factors affecting adsorption posture and the influence of seed adsorption posture on seeding performance,an in-depth study was implemented by the methods of theoretical analysis,high-speed photography technology and test bed experiment by taking sunflower seeds as object.The results showed that:1) The middle of seed was adsorbed and the long axis direction of seed overlapped with the tangent direction of seeding suction holes which is the first posture and the required the minimum adsorption force was found to be the best posture through the observation of high speed camera.This posture was the main adsorption gesture,and the percentage on average was respectively 76.5% and 80% at six kinds of the planter plate speed and vacuum degree combinations.2) The higher the ratio of seed adsorption to the first posture was,the better the seed metering performance performed.The ratio of seed adsorption posture was related to the planter plate speed and vacuum degree.3) The seed throwing methods caused different seeding heights and throwing angles,which were affected by seed postures resulting in the difference of seed spacing.Keywords：air suction metering device;adsorption posture;high speed photography;seed throwing method9|12|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In steering control system,the fuzzy controller based on the driver's experience calculating the expected steering wheel deflection angle causes the problems of excessive or insufficient adjustment phenomenon.And there are also problems of oversize large adjustment and long adjustment time when the classical PID controller is used in the steering control.By using design input value weighting factor controller to adjust the fuzzy controller output,and applying the fuzzy thought into the PID parameter adjustment,research on the steering controller in the navigation system is conducted.The results showed that:1) Based on the original controller,the weighting controller is used to change the input weight and adjust the controller output to realize the optimization of the fuzzy controller.2) By applying the fuzzy principle to the PID parameter adjustment,the value of the size of the PID parameters is optimized.The overshoot is reduced by 20% to 50%,which speeds up the response;3) For a constant speed hydraulic steering system,the steering response speed is proportional to the size of the corner.Keywords：spraying seeding-machine;steering system;fuzzy PID;weighting factor;parameters optimization9|11|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore the impact of urbanization on the technical efficiency of grain production of the farmers,the influence of urbanization is analyzed from three perspectives of population urbanization,land urbanization and economic urbanization STR using data envelopment analysis method (DEA) with output oriented variable returns to scale (VRS) based on the data of 477 questionnaires from Hubei and Henan.The results show that:The average values of comprehensive technical efficiency (TE),pure technical efficiency (PTE) and scale efficiency (SE) of grain production households are 0.635,0.680 and 0.942,respectively.There is still much room for the improvement of the grain production efficiency;The population urbanization and economic urbanization are helpful in the promotion of the technical efficiency of grain production;land urbanization is on the contrary;In addition,irrigation facilities construction is conducive to enhance the technical efficiency of food production,the disaster area of grain is the opposite.Keywords：urbanization;grain;production;technical efficiency;farmers6|9|9<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to explore the implementation effect of China's agricultural technology promotion policy,an empirical analysis is carried out from the perspective of farmers' satisfaction with agricultural technology promotion policy based on the survey data of 1 022 farmers in China.The results show that farmers have general satisfaction degree on the agricultural technology promotion policies.Technical guidance service,technical subsidy way,technical support,agricultural market regulation and agricultural subsidies way have direct effect on satisfaction degree on agricultural technology promotion policy as intermediate variables.Gender,age,education level,cultivation years,scale of cultivated land,village cadres,agricultural income ratio,demonstration households,town distance,purchase agricultural materials,topography,natural disasters and area have show direct and indirect effect on satisfaction degree on agricultural technology promotion policy as initial variables.Keywords：agricultural technology;support policy;farmers;satisfaction degree2|7|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to improve the efficiency of environmental friendly technology extension,based on the survey data of 536 famers with straw incorporation as an example,this study employed the Logistic model to analyze factors influencing farmers' willingness to adopt environmental friendly technologies.ISM model was employed to make the stratified analysis and to clarify the relationship of the influencing factors.The results indicate that variables such as farmers' personal characteristics,farmers' production and management conditions,their cognition of environmental friendly technologies,resource environmental endowment and farmers' trust have a significant impact on farmers' willingness to adopt environmental friendly technologies.Factors including farmers' cognition of technical effect of straw incorporation,the infrastructure construction,the annual household income and the convenience of trade are the direct factors;Factors including degree of trust in the family,land transfer situation,the quality of land and the degree of organization are indirect factors;Factors including family structure and contract land area are deep causes.In order to improve farmers' willingness to adopt environmental friendly technologies,it is necessary to expand the scale of farmers' organizations,promote land circulation,strengthen farmers' cognition of straw returning,promote the infrastructure construction and broaden the channels of increasing farmers' income.Keywords：farmers;environment-friendly technology;straw returning;logistic model;ISM model5|10|21<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Mergers and acquisitions (M&A) decision is the first step in the realization of mergers and acquisitions of seed enterprises.It is also a critical step.Aiming at the problems in the M&A Decision of seed Industry in China.This study is based on the core factors that affect the decision of seed enterprise M&A.The factors include synergistic effect,core competence,entrepreneurial personal factors and external factors.A three-level index system is constructed for the evaluation of M&A in China's seed enterprises.AHP method is used to obtain the optimized evaluation index.The study shows that the core competence and synergistic effect determine the effective implementation of seed enterprise M&A decisions.Entrepreneurial personal factors and external factors also influence the decision of seed enterprise M&A.But the seed enterprise M&A decision evaluation system is a dynamic management process of organic connection.Four first-level indicators and the sub-indicators should coordinate with each other to effectively carry out M&A decision.Keywords：seed enterprise mergers and acquisitions;M&A decision;analytic hierarchy process(AHP) method;core competence2|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to estimate the loss during potato harvesting and investigate its influential factors,11 field experiments are designed based on harvesting method,topography and potato variety and conducted in Guangdong,Inner Mongolia and Gansu.The results show that:Compared with manual harvesting,mechanical harvesting is efficient,but the loss rate is higher due to the limitation of mechanical applicability;Topography,especially the soil condition has a great influence on the loss of the potato mechanical harvest.In conclusion,under the same conditions,the loss rate of mechanical harvest in the lowland is obviously higher than that of the flat.The variety of potato is the main factor affecting the loss of potato mechanical harvest.The loss rate of mechanical harvest of potato varieties with large size,deep and scatter growth is relatively higher.Keywords：potato;harvest loss;harvesting method;potato varieties;topography1|9|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Agricultural machinery is an important commodity in international trade,but the scope of agricultural machinery in trade was not clearly defined in China.In order to construct a clear scope of agricultural machinery product,the advantages and disadvantages of the existing scope were compared,and the corresponding relationship of the classification system in 3 different levels was then used to form a logical and tight product selection method.Finally,a new scope of agricultural machinery product was built based on 6 codes of HS including 3 features (clear,easy connection with the machinery industry and openness).Furthermore,the agricultural machinery were divided them into 10 categories to keep consistent with the industry standard of agricultural machinery classification. The results of this research could be used to evaluate the development and international competitiveness of China's agricultural machinery industry,and provide basic support for industrial policy making.Keywords：agricultural machinery;international trade statistics;scope of product;classification of product1|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
