噴灌均勻系數(shù)對(duì)土壤水氮淋失及作物生長(zhǎng)影響的田間試驗(yàn)研究.pdf_第1頁(yè)
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1、分類號(hào)密級(jí)Y774224單位代碼:10019學(xué)導(dǎo):S02910’專躪差弋夭等’學(xué)位論文噴灌均勻系數(shù)對(duì)土壤水氮淋失及作物生長(zhǎng)影響的田間試驗(yàn)研究EffectsofSprinklerUniformityonLeachingofWaterandNitrateandCropsGrowth研究生:宿捶塑指導(dǎo)教師:理紹丞熬援一合作指導(dǎo)教師:奎么生硒究雖申請(qǐng)學(xué)位類別:王堂亟擎業(yè)領(lǐng)域名稱:一盔些丞工程研究方向:丞資遂皇丞巫境所在學(xué)院:盛型量本王程堂暄20

2、05年5月中國(guó)農(nóng)業(yè)大學(xué)碩士學(xué)位論文摘要AbstractTheeffectsofuniformityofsprinklerwaterandfertigationonleachingofwaterandnitrateandcropsgrowtharefundamentallyimportantfordesigningasprinklerirrigationsystem,andthewaterandnitrateapplicationsare

3、thetwomainfactorsthataffectthenitrateleachingThesweetcoruandwinterwheatfieldexperimentswereconductedtoanalyzetheeffectsofsprinkleruniformityandfertigationonleachingofwaterandnitrateandcropsgrowth,andtheestimatemethodsofc

4、ropcoefficientsforsprinklerirrigatedwinterwheatandsweetoombasedollweighinglysimeterwerediscussedinthispaperThreeexperimentalplots,designedaslowuniformitymediumuniformityandhighuniformitywereusedinsweeteomfieldexperiment,

5、Thequantitiesofnitrateleachingwerecalculatedbywaterfluxandmassbalanceapproachesunderdifferentwri“deruniformityThreeexperimentalplots,designedaslowfertilizerapplicationrate,mediumfertilizerapplicationrateandhighfertilizer

6、applicationrate,wereusedinwinterwheatfieldexperimentTheresultsdemonstratedthattherelationshipbetweenempcoefficientsofsweetcornandwinterwheatanddaysafterseedingcanberepresentedbya4thorderpolynomialequationanda5thorderpoly

7、nomialequationrespectivelyThevariationofcropcoefficientsduringthegrowingseasonforsprinklerirrigatedcropsofNorthernChinaPlainscanbedescribedbythepatternssuggestedbyFAO56,butthecomputedcropcoefficientsareusuallysmallerthan

8、theobservedvalues,thereforeshouldbemodifiedbasedontheobservedresultsWhensprinkleruniformitychangedfrom70%to83%,ithadnosignificanteffectsondistributionandleachingofwaterandnitrate,andtherelationshipbetweenwaterdistributio

9、nabovecanopynitratedistributioninsoilandleachingofwaterandnitratewerenotdistinctWhentheinitialniIratecontentinsoilwasbetween380kgN/hm2end625kgN/hm2,andNfertigationchangedfrom0to180kg/hm2,fertigationhadsomeeffectouthepeak

10、valueofnitrateconcentraton,buthadnosignificanteffectsonthedistributionandleachingofwaterandnitrateFieldexperimentsalsodemonstratedthatthesprinkleruniformityandfertigationhadnosignificanteffectsoncropsyieldKeyWords:sprink

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