小麥-玉米兩熟制下土壤硝態(tài)氮運(yùn)移淋失規(guī)律及灌水施氮量推薦.pdf

1、河北農(nóng)業(yè)大學(xué)碩士學(xué)位論文小麥玉米兩熟制下土壤硝態(tài)氮運(yùn)移淋失規(guī)律及灌水施氮量推薦姓名：劉微申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：植物營(yíng)養(yǎng)學(xué)指導(dǎo)教師：趙同科方正20050619LeachingLossandMovementofNitrateinthesoilofWheatCornDoubleCroppingSystemandNitrogenFertilizerandlrfigafionRecommendationAuthor：LiuWeiTutor：Zh

2、aoTong—keFangZhengMajor：PlantnutritionAbstractThepurposeofthisstudywastoquantifythemovementanddistributionofnitrateinthesoilprofileandnitrogenuptakebycropinwinterwheat—corrldoublesysteminHebeiplainthroughdifferentfertili

3、zerandirrigationtreatmentsFirstlywestudiedtemporaldynamicsofnitrateconcentrationinthesoilsolutionwithdifferentnitrogenfertilizerratesandirrigationtreatmentsindifferentgrowingperiodThesoilsampleswereobtainedbydrillswhichc

4、antakesoilfromdeepprofiles，thenthenitrateleachinglossthroughasoillayerWascalculatedbyqualityapproach，inordertopointoutthemainfactorswhichcanaffectingnitrogenleachinglossandthemainperiodsinwhichlotsofnitratelossduringwhea

5、tgrowth，SecondlyweanalyzetheconstitutesofoutputanduptakebycropandyieldwhichwascausedbydifferentfertilizerandirrigationtreatmentsFinallybringforwardeconomicalquantityoffertilizerandirrigationThefollowingconclusionweredraw

6、nfromtheexperimentalandsimulatedstudies：1ThechangeofammoniacalnitrogencontentsinthesamesoillayeriSsmallindifferentgrowthperiods，thenincreasedinshorttimeaftercornharvestbutthediversityisnotremarkableindifferentgrowthperio

7、dordifferentfertilizertreatmentsinthesamesoillayer2Thecontentofnitrateinsoilincreasedwithfertilizerapplicationincreasing，whereasthecontentdecreasewiththeirrigationincreasingThelossesofleachingincreasedwhennitrogenfertili

8、zerandirrigationincreasedInwheat—corndoublesystem，thetiptopnitrateleachingthrough180cmsoildepthwere2、9、19kg／hm2inoneyearwithN150、250、350k蚰m‘treatmentsDuringwheatseasontheirrigationbeforeplantingandthefirstirrigationinthe

9、nextyearcausedlotsofnitrateleached3TheN03Naccumulationpeaktransferfrom120cmto140cmafterwheat—coladoublesysteminLuquanOnconditionofN3，thecontentofN03“Nhigherthanothertreatmentssignificantlybelow140cminarenaceoussoilinHeng