农业工程

Virtual Simulation Design of Double-fork Feeding Transfer Mechanism of Straw Baler

Chen Yuefeng, Jing Quanrong, Wang Xiongwei, Zhou Shuhui

2012, 2(10)

Abstract(828) [PDF 1028KB](6)

Abstract:
For exploring the motion rules of feeding transfer mechanism of straw baler，transfer process of double-fork feeding transfer mechanism was analyzed.Positional equation of feeding transfer mechanism was established，and basic parameters were determined preliminarily. Solid modeling，virtual assembly and examination interference were achieved by using Solidworks software.Action simulates and kinetic characteristics analyses of double-fork feeding transfer mechanism were completed by using ADAMS virtual simulation technology.Motion loci of feeding fork top and crank-turning angle changes of feeding fork endpoint were obtained.Kinetic characteristics of double-fork feeding transfer were revealed.It provides some references for design of feeding transfer mechanism of straw baler.

Discussion on Economic Accounting Methods of Large Agriculture

Jiang Lianhua

2012, 2(10)

Abstract(617) [PDF 255KB](3)

Abstract:
Contribution of large agriculture machinery farmers was analysed.Significance and methods of economic accounting were expounded.The major purposes were to enhance agricultural mechanization service information communication and administration，direct service and production of large agriculture machinery farmers and promote development of mechanization.It was offered the basis for government decision.

Discussion of Data Statistics Indicators of Agricultural Machinery

Yang Wanzhang

2012, 2(10): 1-3.

Abstract(797) [PDF 548KB](5)

Abstract:
Current data statistics defects of agricultural machinery were pointed out.Two new indexes which were‘reasonable allocation of agricultural machinery’and‘appropriate share ratio of agricultural machinery’were put forward and defined.New calculation methods and usages of them were given.

Modern Physics Prevention for Diseases and Pests in Agriculture and ForestryNew Development Trend of Green Plant Protection

Li Jianguo, Li Bo, Zhang Weiqiang

2012, 2(10): 4-7.

Abstract(702) [PDF 583KB](7)

Abstract:
Chemical pesticides played a key role to reach high yield in China.But many problems，like plant protection machinery and chemical control technology， resulted in ecological environment deterioration and environmental pollution，posed a threat to food security and health of people. Modern physical control technologies broke through traditional concept of pest control and production patterns.Application amount of chemical pesticides and environmental pollution were decreased by using modern physical control technologies.For developing non-polluted forestry industry，ensuring ecology and food security，improving quality and economic benefit of agricultural product and promoting ecological balance and virtuous circle of ecological environment，modern physics prevention is a new development trend of green plant protection.

Problems and Countermeasures of Agricultural Machinery Management in Sichuan Province

Zheng Tong

2012, 2(10): 8-9.

Abstract(700) [PDF 283KB](3)

Abstract:
Agricultural machinery service is an important part of agricultural society service system，and an important way of science developing agriculture.Moreover，it supports modern agricultural industry，and has positive effects for country economy，and promotes the development of agriculture mechanizing continuously and healthily. According to author’s agricultural machinery management experiences gaining from his job for many years，problems of agricultural machinery management in Sichun province were investigated，and gives some suggestions were given.

Design of Open Control System Based on PC+ Motion Controller

Hu Xuelong, Zhang Lixin, Dong Zhen

2012, 2(10): 10-12.

Abstract(735) [PDF 527KB](4)

Abstract:
A two-dimensional platform control system was designed based on Googoltech GTS motion controller，software development and hardware constitution was described. In this system，motion controller acted core，and PC+MCC mode was adopted. Interactive software was programmed under the environment of VB6.0. Pulse frequency was dynamically changed，and rotating speed and veer were controlled by calling function from movement function library.Platform could be precisely controlled by utilizing grating ruler as linear displacement sensor.This system was not only enhanced real time property and speed，but also easy-to-use.

Cooling Effects with Fan-Pad Ventilated in Plastic Greenhouse

Zhao Jieqiang, Zhao Yun, Wu Weixiong

2012, 2(10): 13-15.

Abstract(884) [PDF 791KB](6)

Abstract:
It is very important to know the cooling effect and temperature distribution with wet pad and fan system in agricultural production greenhouse in hot weather summer in Jiaxing region. An experiment was conducted to measure the related factors such as solar radiation，temperature inside and outside in a multi-span plastic greenhouse with an area of 3 072 m2 and equipped with 8 fans.Results indicates that in the situation of 62% relative humidity of outside the fan and pad system had a significant cooling effect with combination utilization of solar shading screens，and the mean temperature inside the greenhouse could be cooled down 4.8 ℃.As to temperature distribution，there was a temperature gradient of 0.063 ℃m and around 2.5 ℃ difference horizontally from pad to fan. Vertical temperature gradient also occurred in greenhouse center location with a temperature difference of 2.6 ℃ between two temperature sensors in 2 m height difference.

Cr（VI） Removal by Hematite with Bacillus subtilis and Related Microbial Activity

Song Changshun, Yao Jun

2012, 2(10): 16-18.

Abstract(652) [PDF 406KB](3)

Abstract:
Growth of Bacillus subtilis BSn5 had been investigated in LB medium at different doses of Cr（VI）with or without hematite. Metabolic heat flux decreased with increasing of Cr（VI）concentration，indicated that subtilis BSn5 reduced their metabolic activity to enhance cellular detoxification ability.Cell growth and total thermal effect had been successfully employed simultaneously to assess the effect of Cr（VI）on Bacillus subtilis BSn5 in the absence and presence of hematite.Relative removal capacity and removal intensity of hematite for Cr（VI）were higher with Bacillus subtilis BSn5 than that without Bacillus subtilis BSn5，demonstrated that it was possible to reduce the toxicity of Cr（VI）in contaminated environment by applying a combined approach of hematite and Bacillus subtilis BSn5.

Effects of Enzyme Preparation on Gel Strength and Texture of Nemipterus virgatus Surimi

Huang Jinfa, Liu Xueping, Gao Xin, Liu Qian, Xu Jiachao, Fu Xiaoting

2012, 2(10): 19-24.

Abstract(761) [PDF 869KB](5)

Abstract:
The impacts of TGase on the gel strength and texture of Nemipterus virgatus surimi were studied through texture analysis，HE Dyeing，and TPA（Texture Profile Analysis）combining with sensory evaluation. It was found that the microstructure of Nemipterus virgatus surimi changed significantly when TGase was added，which was confirmed by more compact texture and smaller pores.Rheological characteristic parameters including instant elastic modulus（E0，E1，E2），viscous modulus（η1，η2），and gel strength increased considerably，especially the gel strength.The maximum of gel strength reached 5.14 N·cm with the addition of 0.4% TGase.It was concluded that gel strength，chewiness，and cohesiveness of Nemipterus virgatus surimi were better when 0.4% TGase was added. In addition，TGase could decrease the water loss of Nemipterus virgatus surimi remarkably，but the concentration of TGase showed no significant difference.

Extraction and Antioxidative Activity of Polysaccharide in Pleurotus eryngii

Ma Jing, Hu Weilan

2012, 2(10): 25-28.

Abstract(942) [PDF 519KB](5)

Abstract:
Optimal parameters of polysaccharide extraction from fresh Pleurotus eryngii using the solvent extract were obtained by single factor experiments and orthogonal teats.The optimum conditions were temperature 70 ℃，extract time 1.5 h，ethanol concentration 75%.According to the analysis of extract，the yield of polysaccharide from fresh Pleurotus eryngii was 2.33%.Antioxidant activity about polysaccharide from Pleurotus eryngii was measured. The clearance rate of hydroxyl radical scavenging about polysaccharide from Pleurotus eryngii was 35.76%.

Problems and Improvements of Plastic Mulched Drip Irrigation for Cotton Plantation in XinjiangFeasibility of Application for Combining Double Degradable Films Mulch with Subsurface Drip Irrigation

Li Xianwei, Shi Jianchu, Zuo Qiang

2012, 2(10): 29-35.

Abstract(876) [PDF 945KB](8)

Abstract:
Plastic mulched drip irrigation technique（PMDIT）has been used widely in Xinjiang because of its high water and fertilizer use efficiencies，and feasible-to-be-mechanized operation in the field. However，lots of problems such as low emergence rate（resulted from the low temperature and soil crust near the film holes for the growth of cotton seedlings）。waste films pollution to the soils and weak adversity resistance（resulted from the shallow roots and high ratio of shoots and roots）were gradually found when using the PMDIT in the practical production.Based on analyzing and summarizing available research results and practical experiences，a technique，combining the double degradable films mulch with the subsurface drip irrigation，was put forward to solve the problems and improve the extensively used PMDIT at present in this study.Technique should be helpful for enhancing the emergence rate and adversity resistance ability of cotton，and reducing waste films pollution to the soils.However，some specific measures（for example，the mulching methods and determination of the degradation duration of the degradable films，and the rational irrigation schedule，etc.）related to the practical application of the technique need further research.

Application of Low-pressure Pipe Irrigation in Paddy Field Irrigation

He Ling

2012, 2(10): 36-37.

Abstract(715) [PDF 307KB](5)

Abstract:
Low-pressure pipe irrigation was used for irrigable land,but not often for paddy field. Taking a land reclamation projects in Tongliao city as case,application of low-pressure pipe irrigation in paddy field irrigation was expounded.And pipe irrigation should be developed in well irrigation areas,where was a water shortages area,under the condition that allows in capital.

Economic Benefit Evaluation on Rural Construction Land Reclamation Engineering in Chongqing City

Huang Yong, Li Junbao, Ge Lin, Hua Ying

2012, 2(10): 38-42.

Abstract(781) [PDF 729KB](4)

Abstract:
To explore the change rule of economic benefit of rural construction land reclamation engineering in Chongqing，five districts of hilly and low mountain region of project type in western and low mountain region of project type in eastern of Chongqing were chosen as the study objects，and analytic hierarchy process was（AHP）used to study the the economic benefit of five regions reclamation project.The results showed that the economic benefit of hilly and low mountain region of project type in western was better than the low mountain region of project type in eastern of Chongqing，and the economic benefit evaluation of five districts which were Hechuan Distract，Zhongxian County，Qijiang Distract，Youyang County，and Wushan County were 0.722，0.618，0.538，0.605，0.226.There were agreement of weight of direct and indirect economic benefit among five districts，but the farmer′s economic benefit weight was different.Except for Wushan County，the farmer′s economic benefit had bigger weight in reclamation economic benefit in other four districts，which was about 0.430.The economic benefit of different districts of rural construction land reclamation project was different，in order to make full use of the land resources，the different policies should be made for rural construction land reclamation in different district，and the urban and rural development of Chongqing would be promoted.

Design of Rear Wheel Hydraulic Drive System of Combine Harvester

Qin Zhiming, Gu Zhiyuan

2012, 2(10): 47-50.

Abstract(954) [PDF 804KB](9)

Abstract:
Necessity of combine harvester with rear wheel drive hydraulic system was discussed from market investigation.Key technologies and requirements to be solved were proposed by practical experience in transforming.Finally，according to present situation of combine harvester industry and actual situation of vast rural areas in our country，combine harvester with rear wheel drive hydraulic system was development trend in harvester industry in China.

Effect of Different Light Qualities on Sugarcane Tissue Culture Seedling

Chen Zhi, Sun Qingli, Wang Yiting, Mou Haojie, Lv Yongping, Zhou Dijiang, Chen Jianping

2012, 2(10): 51-57.

Abstract(1254) [PDF 1073KB](3)

Abstract:
Effects of different LEDs light qualities and plant growth light on sugarcane tissue culture seedling were studied.Results showed that multiplication and rootage of sugarcane with treatment of mixing light qualities of LED red and LED blue were better than those with treatment of LED red，LED blue，LED green and white.And some features of plant material with treatment of mixing light qualities of LED red and LED blue，such as adventitious bud multiplication， adventitious bud morphology，total dry weight during multiplication stage， pigment content，and rooted seedlings qualities，were better than those with treatment of fluorescent light. So mixing light qualities of LED red and LED blue could replace fluorescent light and be used in the future sugarcane plantlet mass production.There was no significant difference between cultivate with plant growth light and with fluorescent light.

Establishment of Regeneration System in Vitro Culture of Stevia rebaudiana Bertoni

Liu Qingbo, Huang Hongmei, Xie Shuyan

2012, 2(10): 58-61.

Abstract(822) [PDF 533KB](3)

Abstract:
Establishment method of tissue culture and regeneration system of Stevia rebaudiana Bertoni were studied by using leaves and stem as explants.Results indicated that stem used as explant was superior to leaf in tissue culture.Optimum medium for stem to induce callus and multiple shoots was MS+0.5 mgL 6-BA+0.5 mgL NAA+3% sucrose+0.7% agar.Based on orthogonal experiment，most important factor on inducing cluster buds was macroelement，next was 6-BA，sucrose，and the least was NAA.Optimum medium for rooting was MS+0.25 mgL IBA+0.2 mgL NAA+3% sucrose+0.7% agar+0.3 mgL activated carbon.Appropriate activated-carbo concentration could obviously increase root rate.

Research Progress on Occurrence Rules and Control Technique of Sesamia inferens Walker in Rice Field in China

Feng Chengyu

2012, 2(10): 62-65.

Abstract(777) [PDF 640KB](4)

Abstract:
Since medium term of 20th century，occurrence and damages of Sesamia inferens Walker were increasing year by year in the middle and lower reaches of Yangtze River in China.And Sesamia inferens Walker had become one of major pest in rice field，occurrence and damages of Sesamia inferens Walker pest were likely to match or exceed other insect pest in part of rice field.Population dynamics，harmful levels，occurrence regularity，biological characteristics，control and forecast technique，and so on were summarized based on occurrence and control situation in recent years.

Analysis on Competitiveness of Agro-industry in Ningbo City

Zheng Jianxin, Yao Ya′nan

2012, 2(10): 66-68.

Abstract(657) [PDF 380KB](3)

Abstract:
Competitiveness of Ningbo agro-industry was analysed through constructing market share rate，location quotient，ratio of gross output value of agro-industry and gross output value of agriculture.The result showed that market share rate of Ningbo agro-industry decreased year by year.According to location quotient，Ningbo agro-industry has no competitive advantage during 2005 to 2010，and decreased year by year also.But from the analysis on the ratio of gross output value of agro-industry and gross output value of agriculture，value creation ability and processing degree of Ningbo agro-industry were far beyond the national average.So we should change the development of agriculture concept，further enhance the recognition of developing Ningbo agro-industry，give full play to the government in promoting the Competitiveness of Ningbo agro-industry，standard the land requisition flow，develop and protect land resources effectively，adhere to the combination of origin pretreating and deep processing，cultivate innovation ability of the enterprise，and expand the value of creativity of Ningbo agro-industry.

Discussion of Sunshine Project Training Model under New Situation

Gu Xincao, Xiang Xiaofei

2012, 2(10): 69-70.

Abstract(682) [PDF 305KB](4)

Abstract:
Deficiency of sunshine project training mode and relevant suggestions of sunshine project training mode under new situation were introduced.

8R Series New Tractors of John Deere Company

Wu Qingfen

2012, 2(10): 73-77.

Abstract(665) [PDF 1079KB](4)

Abstract:
Brief introduction to the technical characteristics of the major structural of 8R series new tractors for John Deere Company.It provides a reference for China’s further research and development of the innovative self-propelled plant protection machine.

2012, 2(10): 78-79.

Abstract(840) [PDF 449KB](3)

Abstract:

2012, 2(10): 80-82.

Abstract(775) [PDF 727KB](5)

Abstract:

2012 Vol. 2, No. 10

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