京郊保護地番茄養(yǎng)分吸收及氮素調控研究.pdf

1、中國農業(yè)大學碩士學位論文京郊保護地番茄養(yǎng)分吸收及氮素調控研究姓名：白優(yōu)愛申請學位級別：碩士專業(yè)：植物營養(yǎng)學指導教師：李曉林陳清20030601StudiesONNutrientUptakeandNitrogenBalanceinProtectedfieldTomatoinBeijingSuburbAbstraetExcessivenitrogeninputsandinappropriateirrigationregimesaretwom

2、ajorproblemsinprotectedvegetablecroppingsystems，includingtomatoproduction，inthesuburbsofBeijingThesepracticescanleadtodeteriorationinvegetablequalityandcontaminationofgroundwaterTheobjectivesofthepresentstudywere：1)todev

3、elopNtargetvalueforefficientNmanagementofprotectedtomato，2)tocomparetheeffectsoffurrowirrigationanddripirrigationontomatogrowthandNutilization，and3)tocomparenutrientuptakeanddistributionintomatogrowninspringandautumnseas

4、onsBasedontomatoyieIdsandNutilizationwithdifferentNinputlevels，thenitrogentargetvalueof535kg’hm‘NwasestimatedforthemaintenanceofprotectedtomatoproductioninBeijingsuburbAlthoughtherecommendedNfertilizerapplicationratecalc

5、ulatedbythetargetvalueWaSsignificantlylowerthanthetraditionalfertilizerapplicationratetherewasnosignificantdifferenceinmarketableyieldbetweenthetwoNtreatments，indicatingthattherecommendationmethodbasedontheNtargetvalueCa

6、ngivesubstantialsavingsinNinputswhilemaintainingcropyieldsIrrigationtechniqueisallimportantfactoraffectingnutrientmovementinsoilandnutrientuseefficiencyinvegetableproductionTheexperimentWasconductedtocomparetheeffectsoff

7、urrowirrigationanddripirrigationontomatogrowthandNutilizationThedripirrigationsystemsavedsubstantialamountsofwaterincomparisionwithfllrrOWirrigationandproducedthesamehighyieldsComparisonofN03Ndistributioninthesoilprofile

8、underthetwoirrigationsystemsshowedthattheN03一Nconcentrationsinthe030cmsoillayerofallNtreatmentsw㈣generallyhigherthan50mg‘kg1withbothirrigationsystemsAlthoughtheNfertilizerswereappliedaSseveralsplitdressingsusingdripirrig

9、ationtheN03一Nconcentrationinthe3060cmsoillayerWasnotfoundtobereduced。TherewasnosignificantdifferencebetweenfurrowirrigationanddripirrigationinsoilNminresiduesatharvestInpractice，tomatoesaregrowninbothspdngandautumnseason

10、sinBeijingregionN，PandKuptakewereinvestigatedduringthegrowingseasonstoobtaininformationaboutnutrientuptakebytomatoplantsMostoftheN，PandKweretakenup晦springgrowntomatoplantsinthemiddleandlaterstagesofthegrowingseason。Incon

11、trasLmostoftheN，PandKweretakenupbyautumngrownplantduringtheearlyandmiddlestagesofgrowth；AccordinglydifferentNdistributionwasgeneratedfromthevarianceinnitrogenuptakeItWasfoundthatNfertilizerforspringgrowntomatoesshouldbea