毕业设计（论文）-地下渗灌管渗水滴头堵塞试验研究

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1、毕业论文中文摘要地下渗灌管渗水滴头防堵试验研究摘要渗灌就是按照作物需水要求，通过低压管道系统与安装在末级管道上的特制灌水器，将作物生长所需的养分以较小的流量，均匀准确地直接输送到作物根部附近的土层中的灌溉水方法，具有省水、节能、灌水均匀、增产、节约劳动力等特点，它是以渗水方式使灌溉水直接灌到作物根部，加之土壤水分受重力作用向下移动，使土表湿润范围很小，因此渗灌有以下优点：减少土表蒸发水，克服地面毛管易于老化的缺陷，方便田间农事作业。针对渗灌滴头使用中的易堵问题，我们在农大试区进行了针孔式和管上式渗灌试验。通过测定土壤水分含量验证滴头是否堵塞

2、，并挖出一些选定的滴头查找造成堵塞的主要原因。结果表明：①水源水质，其中有悬浮状的固体小颗粒以及微生物软泥和一些化学物质的沉积以及金属水管的电化学腐蚀物；②作物根系；③滴头及系统的布置；④管路和土壤直接接触。经过大量的试验和综合分析，找到了一些解决方案，①要将水质过滤；②采取一些物理方法才能更合理的防止作物根系堵塞滴头；③要合理布置系统设施；④在管路旁缠塑料编织布和铺放谷物秸秆对防止滴头堵塞效果也非常明显。关键词渗灌滴头堵塞针孔式管上式-27-毕业论文英文摘要StudyforBlockageTestsonPipelineofSprinkli

3、ngIrrigationUndergroundAbstractAccordingtotheneedofthewaterrequesttothecrops,thelowpressurepipingsystemonthelaststagepipelinewhichwasspeciallymadedouchewasinstalled,andfollowtheneedsbythesmallcurrentcapacitytotransportsdirectlyaccuratelyevenlytothecropsrootnearbysoillayeri

4、ntheirrigationsquarewaterpitcher.Ithasthemeansofsavingwater,theenergyconservation,irrigationuniformity,labor-saving,whichisbasedonirrigationwater.Itfollowsthewaterrequirementsaccordingtothecropirrigation,throughthepipingsystem,inadditiontotheroleofsoilmoisturedownbygravity

5、,sothatsmallrangeofsoilmoist,therearethefollowingadvantages:①toreduceevaporationofsoilwater;②toovercomethedeficienciesofsurfaceaging;③tofacilitateagriculturalfieldoperations.Inviewofexitingsituationthatdropnozzlesofdrippingirrigationiseasytobeblockedinoperation,thedripirri

6、gationexperimentofneedleholetypeandoverpipetypeatedoneintestingfieldofshanxiagricultureuniversitywhetherthepipeisblockedornotisdeterminedbytestingthewatercontentofsoil,thenitisdoggedoutsomeholesthatchosedtolookforthereasonofmakingblocked.Theresultsshow:-27-①thequalityofsou

7、rcewaterThesmallsuspendedsolidandthemicroorganismoozeinwatercancausedthenozzlesblocked,sodothechemistrymaterialdepositsandcorrosionofmetalpine.②croprootsystem③thedistributionofdropnozzleandthewholesystem;④thepipedirectcontactwithsoilThroughmanyexperimentandsyntheticallyana

8、lysis,someresolvedmethodsarefoundasfollow:①Thefitterofwater;②Preventingfromthecroproottob