不同水氮處理對露地葉菜硝酸鹽積累與土壤氮淋失的影響.pdf

1、中國農(nóng)業(yè)大學(xué)碩士學(xué)位論文不同水氮處理對露地葉菜硝酸鹽積累與土壤氮淋失的影響姓名：張小蘭申請學(xué)位級別：碩士專業(yè)：蔬菜學(xué)指導(dǎo)教師：任華中2002.6.1AbstractExcessivewaterandnitrogenapplicationinvegetableproductionnotonlywastedwaterandnitrogenresource，butalsopollutedenvironment，impairedvegetabl

2、equalityandhadlesseffectonyieldimprovementInthisexperiment，theeffectsof5irrigationandfertilizationtreatments(WINl，W2N2，W3N3，W3N2andW3N1，inwhichW1：traditionalirrigation，W2：optimumirrigation，W3：sufficientirrigation；N1：trad

3、itionalfertilization，N2：sufficientfertilization，N3：optimumfertilization)onvegetableyield，nitrateaccumulationandsoilN03“NwerestudiedinamaranthandspinachgrowninopenlandThewaterfluxin90cmsoil，Nleaching，soilwateruseefficienc

4、yandsoilnitrogenuseefficiencywascalculatedwithfieldwaterandnutrientsbudgettheoryInaddition，differentirrigationandfertilizationschemesweresyntheticallyevaluatedThemainresultswereasfollows：1ExceptW3N3treatmentofamaranthgot

5、lessyield，theyieldsofallothertreatmentshavenodistinctdifference2ExceptW3N3treatmentofamaranthroot，thenitratecontentsofdifferentvegetablepartswereovercriterionunderallfivetreatmentsThenitratecontentinspinachis539％1248％ove

6、rcriterionwhile939％285％inamaranthLargerfertilizationcausedlargernitratecontentinvegetablesTherewasnoobviousdifferenceofnitratecontentinvegetablesunderdifferentirrigationtreatments3Thenitratecontentsofleafincreasedcontinu

7、ouslywithvegetablegrowth，whilethatofrootandstemchangedquicklywithwaterandnitrogensupplyIntheseedlingperiod，thenitratecontentofrootwasthehighestwhilethatofleafwasthelowestinallvegetablepartsThemeannitratecontentinspinachr

8、ootwas703mg／kgwhilethatofleafwasonly220mg／kgIntheharvestingperiod，thenitratecontentofdifferentpartswerealmostthesameinspinachandamaranthwithNltreatments，forexample，也emeannitratecontentinspinachleafwas772mg／kgandthatofroo

9、twas796mg／kg，butastoamaranthwithN2orN3treatments，themeannitratecontentofrootandstemwere528mg／kgand539mg／kgseparatelymuchlessthanthatofleaf(1167mg／kg)4ThesoilNOaNcontentwasmainlyaffectedbyfertilizationN1treatmenthadthehi9

10、11estsoilNOrNcontent，moreovertheN03“Ncontentofallthesoillayershadchangedgreatly；whileinN2andN3treatments，thesoilN03NcontentwasmuchlowerandonlythatoftopsoillayerchangedduringvegetablegrowthDifferentirrigationtreatmentsals