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Microclimatic parameters affect Cladosporium rot development and berry quality in table grapes

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Horticultural Plant Journal 2022年第2期8卷 171-183页

作者： Dhanasekaran Solairaj Ngolong Ngea Guillaume Legrand Qiya Yang jizhan liu Hongyin Zhang School of Food and Biological Engineering Jiangsu UniversityZhenjiang 212013JiangsuChina Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina

Cladosporium cladosporioides is an emerging pathogenic fungus that causes Cladosporium rot in postharvest table grapes(Vitis vinifera). However,studies investigating the infection process of C. cladosporioides are lacking. Therefore, this study aimed to elucidate the infection process by investigating the influence of microclimatic parameters(temperature, wetness and fungal age) in C. cladosporioides pathogenesis, activities of grape defense-related enzymes and grape quality during the infection. C. cladosporioides effectively infects grapes by developing distinct colonies on the artificial wounds and berry surfaces, completing its life cycle within 48 h. The C. cladosporioides disease incidence optimally occurred at 20 ℃ and 25 ℃. Wetness played an influential role in the infectivity of C. cladosporioides and 7-day-old C. cladosporioides resulted in the most serious disease incidence of table grapes. As a result of infection, the quality of grapes was affected, including berry weight, p H, titratable acidity(TA), total soluble solids(TSS), and ascorbic acid level. This infection also induced defense-related enzymes, including polyphenoloxidase(PPO), peroxidase(POD), phenylalanine ammonialyase(PAL), and catalase(CAT), at certain times. The findings of this study demonstrated that Cladosporium rot development depended on the microclimatic parameters of grapes, significantly affected the grape quality and induced grape's defense-related enzymes.

关键词： Cladosporium cladosporioides Table grape Pathogenesis Infection

Hanging force analysis for realizing low vibration of grape clusters during speedy robotic post-harvest handling

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International Journal of Agricultural and Biological Engineering 2021年第4期14卷 62-71,I0001页

作者： Muhammad Faheem jizhan liu Guozheng Chang Ibrar Ahmad Yun Peng Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina Department of Farm Machinery and Power University of AgricultureFaisalabad 38000Pakistan

Mechanical damage induced by vibration during harvesting and post-harvest handling could decrease the quality,quantity,and shelf life of the fresh grape ***,fresh grape clusters are harvested by gripping and cutting from the main rachis in the present robotic harvesting system,then transported towards the basket during post-harvest ***,serious cluster vibration and corresponding berry falling may occur during the robotic transportation of hanging grape ***,this study was designed to perform experimental and theoretical hanging force analysis to explore the vibration mechanism of hanging grape clusters during robotic transportation.A lead screw lathe with an attached linear actuator was used to investigate the effects of four different speeds(0.4,0.6,0.8,1.0 m/s)with four acceleration levels(6,8,10,12 m/s2)on the vibration of the hanging grape *** the experiments,the peak hanging force of the grape cluster at the start,constant speed,and stop phase of the actuator was recorded using a single axis force sensor,and the cluster’s swing angle was measured with a digital *** experimental results showed a linear relationship between the swing angle and hanging force of the cluster at the start and stop phase of the *** multi-stage cluster’s vibration during robotic transportation was observed,and the behavior of cycled damping after a sudden stop of the actuator was *** simulated results of hanging force of grape cluster in damping phase were agreed with experimental results with R2 more than 0.90 at an optimum acceleration of 10 m/*** conclude,this research provides theoretical basics for understanding the complex vibration mechanism of the hanging cluster fruits during speedy robotic transportation operations with low-loss of berry drop both on industrial and farm levels.

关键词： grape cluster vibration mechanism hanging force force sensor robotic transportation robotic handling

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智能驾乘式高架草莓采摘车的设计与试验

农机化研究 2024年第4期46卷 114-119,127页

作者：侯广宇雷小洁袁子喻甄军全刘继展谢学军江苏大学现代农业装备与技术教育部重点实验室江苏镇江212013 常州工学院经济与管理学院江苏常州213032

针对高架环境下人工采摘草莓劳动强度大、效率低的问题,设计了一种面对生产作业的驾乘式草莓采摘车。提出了智能草莓采摘车的整体方案,主要包括智能操控系统设计和现场初加工采摘系统设计。试验中,由3组采摘人在不同限定角度的旋转椅上... 详细信息

针对高架环境下人工采摘草莓劳动强度大、效率低的问题,设计了一种面对生产作业的驾乘式草莓采摘车。提出了智能草莓采摘车的整体方案,主要包括智能操控系统设计和现场初加工采摘系统设计。试验中,由3组采摘人在不同限定角度的旋转椅上进行采摘车识别控制试验和现场初加工采摘试验,验证了智能草莓采摘车的实际工作性能。结果表明:草莓采摘车动作识别控制平均准确率为85%以上,能够达到实际采摘作业要求,且更适合长距离全生产性采摘作业;现场称重-包装系统可以直接进行称重—语音提示—打标签—包装的作业流程,大大节省采摘时间,减轻莓农劳动强度。

关键词：草莓采摘车高架智能驾乘式

Development status and trend of agricultural robot technology

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International Journal of Agricultural and Biological Engineering 2021年第4期14卷 1-19页

作者： Yucheng Jin jizhan liu Zhujie Xu Shouqi Yuan Pingping Li jizhang Wang Key Laboratory of Modern Agricultural Equipment and Technology Ministry of EducationJiangsu UniversityZhenjiang 212013JiangsuChina College of Biology and the Environment Nanjing Forestry UniversityNanjing 210042China

In the face of the contradiction between the increasing demand for agricultural products and the sharp reduction of agricultural resources and labor force,agricultural robot technology is developing explosively on the basis of decades of technical and industrial *** view of the complexity and particularity of the development of agricultural robot technology,it is of great value to summarize its development characteristics and make reasonable judgments on its development *** this paper,the type of agricultural robot systems was first *** the classification of agricultural robot systems,the development of main types of monitoring robots,non-selective and selective working robots for crop farming,livestock and poultry farming and aquaculture were introduced in *** the scientific research,core technology,and commercialization of different types of agricultural robots were *** is believed that navigation in complex agricultural environments,damage-free robot-crop interaction,and agronomy-robot fusion have high scientific value and significance to promote the revolutionary advances in agricultural robot *** characteristics of inter-discipline between agricultural robot technology and new materials,artificial intelligence,bionics,agronomy are research *** fast damage-free operation,autonomous navigation for complex environments,target detection for complex backgrounds,and special design for agricultural robots are considered to be the key technology of agricultural robot development,and the development path is ***,robot-crop interaction simulation,big data support,and artificial intelligence are regarded as paths to realize the breakthrough of key agricultural robot *** summary and prospect of this paper are of positive significance to promote the overall development of agricultural robot technology.

关键词： agricultural robot type selective non-selective trend

Tensile mechanical properties of greenhouse cucumber cane

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International Journal of Agricultural and Biological Engineering 2016年第5期9卷 1-8页

作者： Xu Yunfeng Zhang Xiliang Sun Xiaojia Wang jizhang liu jizhan Li Zhiguo Guo Qian Li Pingping Key Laboratory of Modern Agricultural Equipment and Technology Ministry of Education and Jiangsu ProvinceInstitute of Agricultural EngineeringJiangsu UniversityZhenjiang 212013China School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China University of Birmingham EdgbastonBirminghamB152TTUK College of Forest Resource and Environment Nanjing Forestry UniversityNanjing 210037China

To obtain the mechanical properties of greenhouse cucumber cane,tensile and shear properties of the greenhouse cucumber cane were studied by using computer-controlled electronic universal testing machine and homemade cutting test bench,***,the root,middle and head of cucumber cane were subjected for tensile *** tensile stress-strain curves showed that the root of cumber cane presented the characteristics of plastic material,while the middle and head showed the characteristics of brittle *** average tensile strength of root,middle and head of fresh cucumber cane were 7.35 MPa,6.30 MPa and 4.68 MPa,*** average elastic modulus of root of fresh cucumber cane was 280.58 MPa,which was much greater than the middle and head with average elastic modulus of 198.81 MPa and 137.22 MPa,respectively.A pendulum impact cutting test-rig and a cutting force measurement system composed of a cantilever weigh sensor,a high frequency DAQ card and motion control card were *** cutting mechanical property experiments of different parts of greenhouse cucumber cane were carried out,and the continuous curves of cutting force were *** single factor test for cross-sectional area,cutting speed,cutting tool type and manner were *** results indicated that the peak cutting force increased approximately linearly with the increasing of cutting sectional area,but decreased gradually with the increasing of cutting *** the same conditions,the cutting force could be reduced by using straight blade cutting tool and ramp cutting *** the multifactor interaction impact test of the cutting way,the blade type and the cutting speed,it was found that the corresponding F-value of the three factors were 21.316,49.141 and 0.222,which suggests that the blade type is the most significant factor for the cutting force.

关键词： cucumber cane mechanical properties modulus of elasticity tensile strength cutting force

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温室采摘机器人技术研究进展分析

农业机械学报 2017年第12期48卷 1-18页

作者：刘继展江苏大学现代农业装备与技术教育部重点实验室镇江212013

采摘是温室作物生产中劳动力耗费最大且最难以实现机械化作业的关键环节,近几十年来采摘机器人技术得到了迅速发展,特别是日本以番茄、草莓等主要作物为对象的机器人采摘研究得到了持续和深入的开展。这些年中国温室的采摘机器人技术发... 详细信息

采摘是温室作物生产中劳动力耗费最大且最难以实现机械化作业的关键环节,近几十年来采摘机器人技术得到了迅速发展,特别是日本以番茄、草莓等主要作物为对象的机器人采摘研究得到了持续和深入的开展。这些年中国温室的采摘机器人技术发展迅猛,已成为全球研发最为活跃的国家。本文按作物品种对日本、中国、欧盟、韩国等的温室采摘机器人技术研究的发展进程进行分析,梳理出了全球该领域的主要研发主体、技术特征、发展水平和演进脉络。在此基础上总结了温室采摘机器人技术发展的复杂非结构环境的适应能力、复杂机器人系统的融合能力两大技术关键,认为环境工厂化、结构标准化、多机共融化和人机共融化将成为其发展的未来趋势。

关键词：温室采摘机器人

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太湖流域农业结构多目标优化设计

农业工程学报 2009年第10期25卷 198-203页

作者：李萍萍刘继展江苏大学农业工程研究院现代农业装备与技术省部共建教育部重点实验室/江苏省重点实验室镇江212013

该文运用线性规划模型,以农业面源污染削减、粮食及副食品供应安全和农业经济发展为多重目标,设置了流域6大分区农、牧、渔共72个变量,进行了太湖流域农业结构的优化设计。研究结果得到了流域及其6大分区不同农田利用方式、畜禽和淡水... 详细信息

该文运用线性规划模型,以农业面源污染削减、粮食及副食品供应安全和农业经济发展为多重目标,设置了流域6大分区农、牧、渔共72个变量,进行了太湖流域农业结构的优化设计。研究结果得到了流域及其6大分区不同农田利用方式、畜禽和淡水养殖结构的优化方案,可以在保证流域粮食及副食品安全和目前产值水平的前提下,达到农业面源污染35.1%的削减率。根据优化设计结果,提出了保持水田面积、旱地栽培大幅压缩,蔬菜生产设施化、园地生产保持稳定、猪与家禽养殖明显压缩、淡水养殖"压中有保"的太湖流域农业结构调整方向,并对不同分区的调整重点进行了分析。

关键词：优化农业结构太湖流域农业面源污染粮食安全

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面向立柱栽培的机器人移栽苗序与路径分析

农业工程学报 2014年第5期30卷 28-35页

作者：刘继展刘炜毛罕平李萍萍江苏大学现代农业装备与技术教育部重点实验室镇江212013 南京林业大学森林资源与环境学院南京210037

为有效提高穴盘苗向立柱自动移栽的作业效率,以自主开发的螺旋式栽培立柱及其配套移栽机器人系统为对象,进行了无碰撞最短路径设计,进而对不同取苗-栽植方案的路径长度差异及其影响因素进行了分析。研究表明,面向立柱移栽时,单穴盘对1 ... 详细信息

为有效提高穴盘苗向立柱自动移栽的作业效率,以自主开发的螺旋式栽培立柱及其配套移栽机器人系统为对象,进行了无碰撞最短路径设计,进而对不同取苗-栽植方案的路径长度差异及其影响因素进行了分析。研究表明,面向立柱移栽时,单穴盘对1 m立柱移栽的累计路径长度差异在25%以上。取苗顺序对路径长度具有重要影响,其中"让苗"现象是造成累计路径长度差异的主要因素。立柱栽植顺序对路径长度的影响随立柱高度增加而显著增大,对3 m立柱移栽时16类取苗方案的自上至下植苗平均累计路径长度比自下至上高9.83%。稳定最优方案分别为最近相邻法和近端开始同向逐行或逐列取苗、自下至上栽植方案。研究成果对实现高效的立柱自动移栽具有积极意义。

关键词：农业机械机器人栽培移栽立柱苗序路径

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枝上柑橘果实深度球截线识别方法

农业机械学报 2017年第10期48卷 32-39页

作者：刘继展朱新新袁妍江苏大学现代农业装备与技术教育部重点实验室镇江212013

针对柑橘果、叶、枝对象具有球体、片体和细柱体不同的三维几何特征,提出一种识别柑橘果实的深度球截线方法。首先提出了球形果实特征提取的深度球截线方法的基本原理和关键参数,进而分别针对枝上果、叶孤立和贴碰区域提出了孤立果实的... 详细信息

针对柑橘果、叶、枝对象具有球体、片体和细柱体不同的三维几何特征,提出一种识别柑橘果实的深度球截线方法。首先提出了球形果实特征提取的深度球截线方法的基本原理和关键参数,进而分别针对枝上果、叶孤立和贴碰区域提出了孤立果实的特征提取算法和贴碰果实的特征提取算法,得到了复杂枝环境下的深度数据处理与果实识别策略,并综合根据Intel Real Sense F200型深度传感器参数、柑橘果实尺寸、近景探测范围、数据预处理与特征提取需要完成了深度球截线方法的参数确定。大量室内试验结果表明,深度球截线方法对孤立果实提取的平均成功率为97.8%,贴碰区域内果实提取的平均成功率为76%,而复杂枝环境的果实提取综合成功率为63.8%。该深度球截线的识别方法仅利用有限的深度数据点,在保证原始数据精度的同时降低了运算量和果实特征提取复杂性,能有效应对果叶遮挡问题,实现对贴碰果叶的有效区分,对柑橘果实具有良好的适应性,为采摘机器人在复杂环境下的果实识别与定位提供了新的技术思路。

关键词：柑橘采摘识别深度信息球截线特征提取