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ID:17808688
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时间:2018-09-06
《资源与环境学院本科毕业论文(设计)撰写规范》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、资源与环境学院毕业论文(设计)撰写规范一、论文格式样版loanapprovalandpostcreditapprovalofficer/atalllevelsinaccordancewithcreditapprovalrules,licensingandeventualexerciseofcreditdecisionpowerofpersonsorinstitutions.Reviewfindingsandreviewcomments,accordingtotheBank'scredit施氮量对
2、豫北潮土区不同肥力麦田氮肥去向及小麦产量的影响(小2号黑体居中,单倍行距)(五号字空一行)樊俊超(宋体五号字居中)(五号字空一行)摘要:(5号黑体左顶格)在豫北潮土区典型高肥力与中肥力田块上,通过田间小区和15N微区试验,研究了施氮量对麦田氮肥去向及小麦产量的影响,以期为目前小麦生产中氮肥优化管理提供依据。结果表明:1.收获期小麦植株吸收氮素的17.43%-38.75%来自肥料,61.25%-82.72%来自土壤,其中高肥力地块植株吸氮量中来自肥料氮的比例低于中肥力地块,来自土壤氮的比例则高于中
3、肥力地块。2.随着施氮量的增加,植物对肥料氮的吸收增加,肥料氮的土壤残留量和土壤损失量上升,但施肥过量将抑制小麦对土壤氮的吸收利用;小麦对肥料氮的吸收率、肥料氮的残留率和损失率分别为25.51%-40.77%、20.30%-47.14%、17.75%-48.69%,其中高肥力地块氮肥吸收率、损失率低于中肥力地块,但残留率高于中肥力地块……(5号宋体,单倍行距)。(五号字空一行)关键词:(5号黑体左顶格)肥力;冬小麦;15N;氮素吸收;氮素残留;氮素损失(5号宋体)(五号字空一行)↖〔3号Time
4、sNewRoman字体居中,单倍行距〕EffectofNfertilizerrateonthefateoflibelednitrogenandwinterwheatyieldondifferentsoilfertilityfieldsinchaosoilareainnorthHenan(五号字空一行)Abstract:(5号加粗TimesNewRoman左顶格)ToprovideevidenceforoptimizedNfertilizermanagementofcurrentwinterwhe
5、at(TriticumaestivumL.)production,effectsofNfertilizerrateonthefateoflibelednitrogenandwheatyieldwerestudiedwithbothfieldplotexperimentand15Nlabeledmicro-plotexperimentinChaosoilinnorthHenanwithhighfertilityandmediumfertilityfieldrespectively.Theresul
6、tsshowedthat17.43%-38.75%NaccumulatedinwheatplantatharvestingwasderivedfromNfertilizerapplied,and61.25%-82.72%fromsoil.TheratioofthefertilizerNaccumulatedinplanttothetotalplantNwasmoreinhighfertilitysoilthanthatinmediumfertilitysoil,buttheratioofsoil
7、NaccumulatedinplanttothetotalplantNwaslessinmediumfertilityfieldthanthatinhighfertilityfield.WiththeincreaseofN……(5号TimesNewRoman,单倍行距).(5号字空一行)Keywords:(5号加粗TimesNewRoman左顶格)fertility;winterwheat;15N;Nrecovery;Nretention;Nloss(5号TimesNewRoman)(5号字空一
8、行)后接论文引言□□××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××××。loanapprovalandpostcreditapprovalofficer/atalllevelsinaccordancewithcreditapprovalrules,licensingandeventualexerciseofcreditd
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