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1、中國農(nóng)業(yè)大學(xué)碩士學(xué)位論文京郊保護(hù)地番茄養(yǎng)分吸收及氮素調(diào)控研究姓名：白優(yōu)愛申請學(xué)位級別：碩士專業(yè)：植物營養(yǎng)學(xué)指導(dǎo)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

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