欢迎来到天天文库
浏览记录
ID:20851860
大小:16.18 MB
页数:47页
时间:2018-10-17
《玉米苗期精准穴施肥机构设计及试验》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、万方数据东北农业大学工学硕士毕业论文accumulationofprickingholeseriespositionproblem,improvethemechanismoffeasibility,tocreateanewspaceforthenextexperimentandresearch.Inthesolidstateholefertilizationtechnologynowdesignedrotatingsleeveprickingholefertilization,canavoidtheblockagephenomenonofsoilfertilizer,fertilizer
2、transmissionmechanismanalysisofthestressanddeformationofthedisadvantaged,andimprovedirection,andthenanalyzesthereasonsandinfluencingfactors,whichlaysafoundationforthefurtherimprovementandoptimization.Simulationofthemechanismmovementinthesoillayerbetweenthetrajectoriesofequipmentoperation,inthesoi
3、lofthevelocity,acceleration,forceandtimeefficiencyandotherparameters,thedesignofmotion,putsforwardthedesignproblems,andthedefects,causesarefound,theoccurrenceofthisphenomenononthebasisofthetheory,andanalysisoftheworkingmechanismoffertilizingdevice,designideasanddesignimprovementandoptimization.Ex
4、perimentalstudyofsinglefactorandmultifactorsofthemainparametersofthesoilbintestbench,tofindtheoptimalparameters,thethreeregressiontestmethodfivelevelorthogonalrotationcombinationfortwotimes,thespeedfor1.25m/sinthecar,thepoweroutputshaftspeedis16.5r/min,seedlingheightbyneedlein5mmunderthecondition
5、of6mmonholefertilizationexperiment,theoptimumparameterscombinationoffactorsintheoptimumrange.Resultsshowedthat:pointlinefittingis66.2%,seedlinginjuryratewas10%,theoptimalperformanceindexrange,theoptimizationresultscanbetrusted,astheholefertilizationmechanismtofurtheroptimizethetestreference.Keywo
6、rds:Maizeholefertilization;automatic;precision;Candidate:LiMutongSpeciality:AgriculturalMechanizationEngineeringSupervisor:ProfessorZhouFujun万方数据引言1引言1.1研究背景和目的意义作为世界人口最多的国家,且农业为第一产业的中国有着独特的资源,土地面积大,数量多,资源多样化,同时人均占有量极少。随着人口的不断增多,可开发的耕地资源越来越少,这就决定了要保证我国粮食增产必须依靠提高耕地单位面积产量的方法,提高土地生产效率。其中,对于北方寒地区域来讲,
7、粮食产量占全国的比例不容忽略,中耕作业和追肥等农业机械装备的需求也逐步增加,对于有效的提高追肥效率是影响中耕作物产量和质量的重要方式和途径11】。对于化肥的使用量考虑,其对粮食的总体增产作用约为40%。截止到2006年,中国正式称为了世界首位化肥消费和生产国,其投入规模占我国农业消耗总成本的50%左右。然后,对于施肥方式和设施而言,其化肥利用率并不可观,对于大部分中耕作物的追肥效率总体分析和统计,总施肥利用率不高于32%,这也导致化
此文档下载收益归作者所有