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- Abstract：Gibberella stalk rot,caused by Fusarium graminearum,is one of the most devastating soil-borne diseases in maize.A susceptible maize inbred line Y331 was inoculated with F.graminearum and sampled at 6 and 18 hours post inoculation for RNAseq.A total of 5 153 genes were differentially expressed after F.graminearum inoculation.Many defense related genes were significantly enriched in the upregulated clusters,while genes involved in growth and development,carbohydrate and ATP metabolism were enriched in the downregulated clusters.All these results indicate a cost-effective energy use of maize after pathogen inoculation.Genes involved in ET related processes were enriched in Cluster1 and 6,both of which were upregulated before 6 hours post inoculation.Biological processes like JA or SA biosynthesis process,response to JA or SA,JA or SA medicated signaling pathway were enriched in the upregulated clusters.In the upregulated clusters,genes involved in phenylpropanoid biosynthetic process were also enriched;genes involved in flavonoid and lignin biosynthesis and genes involved in DON detoxification were upregulated after F.graminearum inoculation.All these results indicate the important roles of ET/JA,SA and secondary metabolites in the interactions of maize and F.graminearum.Keywords：maize;transcriptome;Fusarium graminearum;resistance;phenylpropanoid biosynthetic process;hormones0|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Transcription and expression of NAD3 and COB were analyzed using F1 plant of three near isogenic mitochondria lines including UG93A(male sterile line),UG93B(maintainer line) and UG93A×FuHong992(restorer line) kenaf as study materials.The results showed that:The coding sequence and RNA editing of NAD3 displayed no differences among these three lines;The coding sequence of COB is completely consistent,and there were 8 editing sites of RNA editing,which occurred at the first or the second position of codons with alteration of amino acid type and was mostly converting hydrophilic amino acid into hydrophobic amino acid;The editing frequencies of COB were lower in sterile cytoplasm than in fertile cytoplasm;There was no size difference of NAD3 and COB mRNA in the three lines,but the expression level of NAD3 and COB was reduced significantly in UG93A compared to UG93B and F1,indicating that NAD3 and COB might play an important role during the anther development of kenaf.Keywords：kenaf;RNA editing;NAD3;COB;expression analysis1|8|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Based on toxicology,pot experiment was conducted to analyze the changes in growth status and physiologic indexes of sweet sorghum and corn under Pb stress.The subordinate function was used to make comprehensive evaluation.The results showed that:Under Pb stress,plant height,biomass and chlorophyll content were decreased,chlorophyll a/b,the content of MDA,the content of proline and permeance of cell membrane were increased.Different indicators showed different amplitude of variation.Single indicator failed to evaluate the resistance of crop.However,by using the method of subordinate function to evaluate plant's resistance,the value of Jintianza 1,Jintianza 2,Jintianza 3 and Dafeng 30 were 0.327 2,0.287 0,0.885 8 and 0.274 8,respectively.The comprehensive evaluations of resistance showed that Jintianza 3 > Jintianza 1 > Jintianza 2 > Dafeng 30.The results indicated that Jintianza 3,the strongest resistance variety,was suitable to be cultivated at Pb contaminated soil.Keywords：sweet sorghum;corn;Pb;tolerance coefficient;subordinate function value method8|10|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To explore SWEET gene family expression and function in grape berry,we 9 SWEETs,which were differentially expressed between grape berry development stage Ⅰ and Ⅲ by RNA-Seq data analyzes of Vitis vinifera L.cv.Cabernet Sauvignon were selected.By using bioinformatics approaches,their gene structure,protein physicochemical properties,secondary structures,subcellular localization,conserved motifs as well as sequence homology predicted and analyzed and real-time fluorescence quantitative PCR was used to validate some genes.Genetic mapping for SWEET genome localization found that they was distributed on seven chromosomes,9 VvSWEETs sequences was divided into four sub-families.Differences existed in the amino acid number and hydrophobic character among the 9 VvSWEETs.Secondary structure prediction revealed that the major composition of the amino acid sequences of the 9 VvSWEETs were alpha helix and random coil.Structural analysis of exons and introns showed that only VvSWEET4 has four introns,others have five introns.Protein subcellular localization analysis indicated that 9 VvSWEETs were localized in plasma membrane,chloroplast thylakoid membrane and the vacuole membrane.QPCR results indicated that the 9 SWEETs with differentially expression between grape berry development stage I and III,5 of which were up-regulated,and 4 down-regulated,which were consisting with transcriptome sequencing analysis.Keywords：grape berry;SWEET;gene family;bioinformatics analysis;QPCR6|7|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To analyze the characteristics of volatile compounds in red-fleshed peach,headspace solid phase micro-extraction method was used to extract volatile compounds in ripen fruit of two white-fleshed varieties (‘Hakuho’ and ‘Feicheng Bai Li 10#’) and two red-fleshed varieties (‘Wu Hei Ji Rou Tao’ and ‘Tianjin Shui Mi’),and the extracts was then measured by gas-mass spectrometry.A total of 107 volatile compounds were identified from 4 varieties,where the most abundant compounds were found in ‘Wu Hei Ji Rou Tao’,and the least in ‘Feicheng Bai Li 10#’.Compared with white-fleshed peach varieties,3-hexen-1-ol,1-acetate,(3Z)- and 3-hexenal were two major elements only in red-fleshed peach.In addition,among the micro-volatile compounds,nonyl aldehyde,1-octanol,and hexyl acetate are also unique in red-fleshed peach.Lower aldehydes and higher alkanes and esters were present in red-fleshed peaches than in white-fleshed peach.The study suggested that there were great differences in total volatile compounds content and several characteristic elements between red and white flesh peach except anthocyanin content.6|8|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To solve the problem of the poor apple recognition performance under the natural light,two approaches of fruit color segmentation and shape extraction were studied to find an effective method for identifying apple fruits under natural light conditions.For the fruit segmentation,color threshold,SVM (Support vector machine) and BPNN (Back propagation neural network) were carried out and the results were compared and analyzed.The results showed that the segmentation result based on neural network was the best because of its high processing speed,low target missing rate and low identifying fallout ratio.For the fruit shape extraction,6 edge detection algorithms were applied and compared,the results indicated that Log edge detection algorithm was the best.Hough transform was also used to extract the characteristics of fruit shape from the edge image by circle detection and the center and radius of each fruit.The results showed that the apple identification approach based on BPNN apple color classification method,Log edge detection algorithm and Hough shape extraction algorithm achieved high robustness and accuracy,could effectively overcome the problems such as shading,overlapping and color variation,and its average identification rate reached 91.6%.It illustrated that the recognition algorithm for apple fruits was effective to identify apple fruits from apple tree's image taken under natural light conditions.Keywords：apple;threshold segmentation;BPNN;SVM;edge detection;circle detection of Hough;fruit recognition1|8|7<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To study the relationship between ABA and ethylene content and fruit ripening during the development of fig fruit,fig (Ficus carica L.) cultivar ‘Masui Dauphine’ was used in this study.The changes of respiratory rate,soluble sugar content,starch content,ABA level and ethylene production level were examined.The results showed that:The development of fig fruit was comprised of three phases,phase Ⅰ (the first rapid growth stage),phase Ⅱ (the lag phase of growth),and phase Ⅲ (the second rapid growth stage).The transition from phase Ⅱ to phase Ⅲ was the onset of ripening.After the onset of ripening,starch content of fig fruit was decreased,but a large amount of glucose and fructose were accumulated,and the fruit matured quickly.There was an decrease in ABA content during ripening of fig fruits.But there was an increase in ethylene production during fig fruits ripening,and during the onset of ripening a respiratory climacteric rise was concomitant with a sudden burst of endogenous ethylene production.These results suggested that fig fruit is a typical climacteric fruit.Ethylene initiated a chain of metabolic and physiological events which lead to fig fruit ripening.Keywords：Ficus carica;fruit ripening;ABA;ethylene0|9|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To investigate the characteristics of ewe's vocal signals under different stress behaviors,twenty 2-3 year-old small-tail Han sheeps with similar body weight were chosen and their vocal signals were collected respectively under three stress behaviors including delivering,seeking for lamb,and hungry.A system to process and identify the vocal signals was designed with LabVIEW,by which the signals were analyzed in time domain,frequency domain (power spectrum estimation of Yule-Walker method,Welch method,linear coordinate power spectrum and cepstrum method) and time-frequency domain.And then the characteristic parameters of vocal signals were extracted including time interval,duration,main peak frequency,energy concentration range,etc.The results demonstrated that the ewe's call signals under three stress reactions showed significant differences in duration and peak frequency (P<0.05).The duration of ewe's vocalization when seeking for baby and hungry was 1.93 and 1.82 times respectively than that of lambing;while the main peak frequency when hungry was 34.77 and 38.81 times higher respectively than lambing and seeking for baby.The Yule-Walker power spectrum detected one peak when hungry,two peaks when seeking for baby,and no apparent peak when lambing.The sound signal energy of ewe was concentrated within the range of 400~600 Hz when lambing,0~900 Hz when seeking for baby and hungry;the pitches of three sounds are all close to 0.1 ms.In conclusion,the call signals can reflect the changes of the external environment and physiological conditions of ewes,and it can be used as one of the important evidence for sheep health monitoring and welfare evaluation.Keywords：ewe;vocalization;signal processing;feature extraction;power spectrum2|9|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To study the effects of melatonin (MT) on the fiber growth and follicle morphology of primary follicle from Inner Mongolia cashmere goat in vitro,microdissection separation method and enzyme digestion method was used to isolate primary follicles.The primary follicle was isolated in different concentrations of collagenase (0.10%,0.20%,0.25%,0.30%,0.35%,0.40% and 0.45%) and at different time (100,80,70,60,50,45 and 35 min).Melatonin (300 pg/mL) was added to primary follicle culture for 5 days,and then primary follicle was observed with an inverted phase-contrast microscope.The results showed that the most suitable concentration and time was 0.3% and 60 min,and the effect of melatonin on primary hair follicles was significant (P<0.01).Keywords：melatonin;primary follicle;in vitro;Cashmere goat1|8|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Embryo development is a complicated process,which involves diverse physiological,cell biological and genomic processes.Current studies have shown that there is certain strength of endogenous electric field existing in early embryo development,especially in gastrula and neurula period.Similar strength of applied electric fields directs cell migration,polarization,proliferation and differentiation,which affect the early embryo development.The guidance and interference effects on embryo development by endogenous or applied electric fields are reviewed in this paper,which may provide a novel perspective on future researches on embryo development.Keywords：embryo development;electric field;extracellular electrical field1|9|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to obtain the quality changes of silver carp (Hypophthalmichthys molitrix),quality indicators,ATP-related compounds and enzyme activities of silver carp were measured during partial freezing.The results indicated that:During partial freezing,mass fraction of total volatile base nitrogen (w (TVB-N)) increased but didn't reach the limitation on country's regulation of 20 mg/100 g;With the increasing of storage time,logarithmic value of total aerobic counts (lg[TAC/(CFU/g)]) went up,while sensory scores,salt soluble protein content,Ca2+-ATPase activity,texture properties decreased;ATP-related compounds and enzyme activities,content of ATP、IMP came down,Hx rose up with time and HxR increased at first and then decreased,and reached peak on nine days of storage.In conclusion,changes in acid phosphatase (ACP) and AMP-deaminase (ADA) activities cannot perfectly represent the variations on ATP-related compounds.Keywords：silver carp;partial freezing;quality indicators;ATP-related compounds;ATP-related enzyme activity2|8|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to solve the problems of high labor costs,soil erosion,and poor water and nutrient conservation caused by clean tillage of soil in orchard apple production in Beijing area.A research project was conducted in an apple orchard with dwarf apple trees in Yan Qing district,Beijing.Three experimental tests were conducted to quantify the effects of different soil management practices:1) coving with mulch made of branches of apple trees,2) growing rape on the orchard ground,and 3) tilling the ground without any coverage.Three treatments was carried out to investigate their impacts on soil aggregate structure,soil moisture content,soil temperature,CO2 emission rate,and soil organic matter.Experimentalresults showed that:During the main growth period of fruit trees,the large aggregate content of the residual branches covering soil at the 0-30 cm soil layer,the diameter (1 mm was high than that in clean tillage by 46.7%;The soil moisture content of broken branches covered with tillage was 18.4% higher in 10-30 cm soil layers compared to clean tillage;And there was no significant difference (P>0.05) on soil CO2 release rate;while the soluble solids increased by 6.7% and single fruit weight increase by 7.5%.In conclusion,the soil physical and chemical characteristics and the fruit quality were improved.This study provided a theoretical and scientific basis for exploring new soil management practices for peach orchards in Beijing region.Keywords：orchard;brash covering;soil;water-holding capacity;aggregates4|9|9<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to evaluate the effect of papermaking wastewater irrigation in Shuangtaihekou Wetland comprehensively and and objectively,we simulated Shuangtaihekou Wetland by building experimental device schemes.to analysis The changes of reed growth indexes caused by wastewater irrigating at various growth period.Meanwhile,the Rough Set method,was adopted to evaluate the effect of reed wetland by papermaking wastewater irrigating.The results showed that the concentration of papermaking wastewater for irrigation was positively correlated with the reeds growth indexes,soil nutrient content and soil heavy metal contents.Each reed growth index,including reed plant stem diameter,plant height,leaf area and biomass,displayed significant difference under different concentrations of wastewater for irrigation.However,soil nutrients content such as organic matter,TN,and TP,showed no significant difference with the change of the concentration of.And the heavy metal content of the soil was changed significantly with the change of wastewater concentration.Composite score was made for the impact on reed wetlands at different concentrations of papermaking wastewater for irrigation by Rough Set method.When the concentration of irrigation water was 300,150,50 and 0 mg/L,they scored 0.802 6,0.694 1,0.681 3 and 0.401 3,respectively.In conclusion,under the current irrigation status,the greater the concentration of waste water,the higher the composite score.Therefore,despite the accumulation of heavy metals in the soil,the papermaking wastewater irrigation remains favorable in general for the growth and development of reed.Keywords：wetland;papermaking wastewater;reed;rough set1|7|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：An investigation of 20 typical biogas plants located in Beijing rural areas was conducted by the research team of China Agricultural University in 2009 and 2015.The project investment,design and construction were investigated and comprehensive and comparative analysis was carried out on operation,utilization of biogas and by-products.The result showed that:Compared with 2009,the raw material was mainly the pig waste and continued increasing (55%) in 2015.It was mainly affected by local farming industry;The number of biogas plants used solar energy to replace coal for heating in winter increased to 5 in 2015 from 3 in 2009; The number of biogas engineering with winter coal-fired heating dropped from 16 in 2009 to 10 in 2015;The number of biogas plants among investigated adopted solid-liquid separation technique was 5 in 2015 and 3 in 2009.Due to the difference of raw materials,most of the biogas plants didn't use solid-liquid separation technique,and the utilization of biogas fertilizer was limited to fruit and vegetable irrigation and lack of efficiency utilization.In addition,the number of workers with certification increased with the efforts from state and local governments.Keywords：Beijing;agricultural waste;biogas projects;investigation;comparative analysis1|11|3<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to achieve maximum economic benefits under the limited agricultural water resources,a dual interval two stage stochastic programming model to maximum economic benefit is constructed by considering the uncertainties in the hydrological factors and the social economy in the planting structure optimization.The dual interval theory is used to calculate the water resources due to its dual interval uncertain characteristics.This model is applied to the middle reaches of Heihe River basin including three counties,Ganzhou,Linze and Gaotai in Gansu Province under five hydrological years (low flow years,partial low flow years,normal flow years,partial high flow years and special high flow years).By comparing the model results with the status quo,it is found that the economic benefits of three kinds of planting structure optimization schemes given by the dual interval two stage stochastic programming model are increased[1.97,8.53],[4.20,11.04] and[6.43,13.56] billion yuan respectively.Keywords：planting structure optimization;dual interval theory;two stage stochastic programming;uncertainty0|10|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：The regional disparity decomposition method on China's total factor productivity was assessed through provincial panel data from 1985 to 2013.The Färe-Primont productivity index (FP index) method was adopted to measure and decompose agricultural TFP (Total factor productivity).Further Analysis of Variance (ANOVA) was applied to analyze regional disparity and source of agricultural TFP according to its composition.Results showed that:1) Regional disparity of agricultural TFP was gradually expanding during the period of 1985-2013,and trending towards agricultural technological progress and RME (Residual mix efficiency);2) Although observing from provincial disparity of agricultural TFP,the contribution of RME to regional disparity was gradually decreasing.However,technological efficiency played a leading role in the regional disparity of TFP.Precisely,regional disparity in the eastern region was derived from technological progress and RME.While regional disparity in central and western regions was derived from technological efficiency and RME;3) According to cluster analysis based on input-output indexes,it is concluded that technological efficiency and RME are the main sources of regional disparity in China's TFP.Keywords：agricultural TFP;regional disparity;residual mix efficiency;Färe-Primont productivity index;Analysis of Variance0|8|6<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：An survey was carried out on whether farmers do well or not in enclosed feeding in terms of building and management and their influence factors.The result showed that there were only 26.89% of farmers carrying out enclosed feeding but most farmers are lacking of consciousness on enclosed feeding at present by collecting 331 questionnaires;The significant influencing factors were farmers' age,farm's breeding scale,the breeding community regulated by government,the proportion of the employees who understand epidemic prevention and risk preference.Among them,the influence of breeding scale was the most significant factor at P<1% level and had positive correlation.When the farmer's age was young,feeding scale was large,breeding community was regulated by government,the high proportion of employees understanding epidemic prevention was high,and farmers averse of risk,the intention of farmers to carry out enclosed feeding was high.Relevant policy suggestions were put forward base on this study.Keywords：risk of avian influenza;enclosed feeding;closed chicken house;personnel mobility restriction;Logit model1|7|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To provide theoretical and empirical basis to formulate reasonable compensation standard for government,a model of farmers' economic losses is built toevaluate the free-range and scale farmers' economic losses and the compensating degree of policy under the outbreak of avian influenza based on the survey data of avian-infected area,Zhongwei in Ningxia.The outbreak of avian influenza causes severe economic losses to farmers,and the indirect economic losses are larger than the direct losses;the farmers' economic losses in avian-infected area are variant due to the age of layer chicken,and specifically farmers raising 5 months layer chicken suffer the most serious economic losses;the economic losses are different among farmers because of differing in the way to feed layer chicken,and concretely the scale farmers' economic losses are larger than the free-range farmers';compensation policy in our country can make up 24.64% and 20.94% economic losses of scale farmers' and free-range farmers' respectively.Meanwhile compensation policy in Ningxia can compensate 26.29% and 22.02% of their economic losses respectively,indicating the satisfaction of compensation policy is low.When making compensation policies for avian influenza,the government should consider the components caused farmers' economic losses,which is raising the compensation standard on one hand,setting differential compensation standards according to the age of layer chicken and the way to feed layer chicken on the other hand.Keywords：layer chicken;avian influenza;free-range farmers;scale farmers;economic losses;compensating degree0|7|4<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to reveal how livelihood capital affects farmer household's choice of sales channel,an index system was constructed based on sustainable livelihoods framework and farmer households' livelihood capital situation in different districts was evaluated.Multivariate probit model was then employed to analysis the effects of livelihood capital on farmers' choices of agricultural product sales channel.The result indicated that:1) There is a better situation of other types of capital than natural capital in Beijing.Farmers in Liaoning area have less human capital and there is a shortage of financial capital in Shandong;2) On one hand,the main impact factors of farmer household's choice to sell agricultural products through cooperatives or order form selling are physical capital,social capital and financial capital.On the other hand,human capital and natural capital significantly affect farmers' willingness to sell agricultural products through brokers,wholesale markets,retail market and supermarket.3) There are significant complementary effects among brokers and retail selling,order form selling and supermarket form selling,order form selling and cooperative selling.Obvious substitution relationship is existed between wholesale sales and retail sales,wholesale sales and broker sale channels,and cooperative sales and wholesales.Keywords：vegetable;farmer's household behavior;livelihood capital;sales channel;Multivariate probit model1|7|1<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：In order to find out the influence factors of farmers' environmental friendly behavior,correlation analysis and hierarchical regression analysis were used to examine the influence of environmental awareness on environmental friendly behavior based on the survey data of 403 households in Chongqing.Rural community environment is introduced as one regulated variable and the moderating effect of the community environment on the relationship between environmental awareness and environmental friendly behavior was investigated.The results showed that:The environmental action skills and environmental behavior attitude of farmers both had significant positive effects on their environmental friendly behavior;the environmental public service and environmental policies' implementation in the community displayed significant moderating effects on the relationship between environmental awareness and environmental friendly behavior.Corresponding policy recommendations were put forwarded:1) Strengthening the propaganda and encouragement of environmental protection to train the farmers' attitudes to environmental protection;2) Increasing the popularization and application of environmental friendly agricultural technology to enhance the farmers environmental action skills;3) Creating environmentally-friendly community atmosphere to urge the farmers' adoption of environmentally friendly behavior.Keywords：farmer;environmental awareness;environmental friendly behavior;community environment;moderating effect3|8|13<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：Taking rural residential settlements in Yujiang County as study object,factors affecting rural residential layout are comprehensively analyzed and evaluated.The clustering pattern of rural settlements is investigated by kernel density estimation.Four optimization schemes were proposed based on the above research.Weighted Voronoi diagram was introduced to determine the rural residential moving direction.The results show that:the comprehensive influential factors of rural residential are divided into three levels (level 1,2 and 3);The rural residential area of three levels are 2 472.54,3 173.01 and 977.26 hectares,accounting for 37.33%,47.91% and 14.76%,respectively;Rural residential of high-level is mainly distributed in central area of Yujiang County,whose condition is superior,and rural residential of low-level are mainly distributed in the northern hilly region;Kernel density analysis results intuitively display that high concentration of rural residential are mainly distributed in central plains area,giving priority to development.Considering rural residential layout optimization scheme,there are 1 116.99 hectares rural residential of urbanization;2 839.37 hectares rural residential which given priority to development;2 126.93 hectares of rural residential has internal developing potential;539.52 hectares of migration and merge rural residential,and in the north and south hilly terrain with poor general condition,a few migration sites were set up.The results of our research provides significant reference for the scientific planning and layout of rural residential in the low-hilly region,and can be applied to land renovation,village and general land use planning.Keywords：rural residential;comprehensive influence;kernel density;layout optimization;weighted voronoi diagram5|8|24<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：To evaluate the government performance of dairy products safety supervision in Beijing City,Delphi method was adopted to screen the government performance evaluation index system of the safety supervision of dairy products and the fuzzy comprehensive evaluation method was then used to calculate the index.The results showed that:Public supervision of dairy products in Beijing overall,the general attitude of the performance assessment index was 69.19;In the fuzzy comprehensive evaluation of the 6 indicators,people were not satisfied with the law enforcement of Beijing's dairy products testing and certification;after the evaluation of the 19 second grade indicators,the dairy regulatory efficiency is the lowest value in supervision organization setting and ability,the detection ability of dairy products and the value of the number of enterprises with advanced certification is the lowest in products testing and certification,illegal punishment in place rate is the lowest in the law enforcement evaluation.Countermeasures and suggestions were put forwarded to the problems of low efficiency,small number of certification enterprises and inadequate enforcement of the supervision of dairy products in Beijing.Keywords：dairy products safety regulatory;government performance evaluation;Delphi method;fuzzy comprehensive evaluation method0|7|0<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
- Abstract：This study aims to understand the research hot topics,development trend,as well as the advantages and disadvantages of facility agriculture.Patent information analysis method is used to investigate the difference between domestic and foreign patents.The results show that:The technology of facility agriculture in our country has entered maturity stage and the new technology features are becoming more and more obvious;The irrigation system,wireless remote control system,power control system,irrigation pipe and spray pipe are the hottest topics.Meanwhile pest prevention is the blank area.However,company's patent application is still in a weak position,lacking of competitive core technology at this stage.Therefore,government should strengthen its guidance to the enterprise,escort industrial development and promote the facility agriculture to market-oriented and industrialization development.Keywords：facility agriculture;patent information;patent analysis;social network analysis;patent map6|10|2<HTML><L-PDF> <Meta-XML>Updated：2024-02-27
