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时间:2020-03-27
《氮肥运筹对稻田田面水氮素动态变化及氮素吸收利用效率影响.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、农业环境科学学报2010,29(5):1000-1005JournalofAgro-EnvironmentScience氮肥运筹对稻田田面水氮素动态变化及氮素吸收利用效率影响潘圣刚,黄胜奇,曹凑贵,蔡明历,翟晶,江洋,张帆(农业部华中农业大学作物生理生态与栽培重点开放试验室,武汉430070)摘要:通过大田试验,设计3个不同氮肥水平(0、150、240kgN·hm‘2)和两种不同施肥比例(基肥:分蘖肥:穗粒JlE=40%:30%:30%、基肥:分蘖肥:穗粒nE=30%:20%:50%).研究了氮肥运筹对稻田田面水氮素动态变化特征和氮素吸收利用效
2、率的影响。结果表明,稻田田面水N磁一N和总N浓度在施肥后第ld达到最大值,随后降低,在施肥后的第7d,分别降为峰值的7.88%一17.84%和29.71%~45.55%。施氮水平介于0-240Nkg·hm之时,水稻产量随着氮素水平的提高而显著增加,氮素的吸收利用率和偏生产力却随之降低。在高氮水平(240kgN·hmt)下,与氮肥前移相比(基肥:分蘖JIE:穗粒肥=40%:30%:30%),采用氮肥后移(基肥:分蘖肥:穗粒肥=30%:20%:50%)的施肥比例。水稻产量增加了6.2%、氮素吸收利用率和农学利用率分别提高了30.49%和23.72%
3、,而氮素生理利用率和偏生产力差异不显著,说明适宜的氮肥运筹可以增加水稻的产量,提高氮素的吸收利用率和农学利用率,减少氮素损失。关键词:氮肥运筹;水稻;氮素吸收利用效率;田面水中图分类号:S181文献标志码:A文章编号:1672—2043(2010)05—1000-06EffectsofNitrogenManagementonDynamicsofNitrogeninSurfaceWaterfromRiceFieldandNitrogenUseEmcieneyPANSheng-gang,HUANGSheng-qi,CAOCou—gui,CAIMin
4、g-li,ZHAIJing,JIANGYang,ZHANGFan(KeyLaboratoryofHuazhongCropPhysiology,EcologyandProduction,MinistryofAgriculture,HuazhongAgriculturalUniversity,Wuhan430070,China)Abstract:EffectsofnitrogenmanagementonnitrogenuseefficiencyandnitrogenconcentrationinthesurfacewakIrfromricefiel
5、dwereex-aminedbyafieldexperiment.Inthisstudy,thenitrogenwasappliedinthreesplitsas40%basal,30%at10daysaftertransplanting(DAT),30%36DATand30%basal,20%10DAT,50%36DATatthreeNratesas0,150,240kgN-hm’2.TheresultsshowedthattwoNconcentra—tions(Nl-I:’-NandtotalN)inthesurfacewaterreach
6、edthehighest011thefirstdayafterfertilizerapplication,andthereafterdecreased.NH;-NandtotalNconcentrationsat7thdaywereseparatelyinrangesof7.88%-17,84%and29.71%.-45,55%.GrmnyieldWassignificantlyin-creasedastheNratesincreasedfrom0to240kgN·hm-2however,nitrogenrecoveryefficiencyan
7、dpartialfactorproductivitywerede-creased.AttheNrateof240kgN·hm-2,grainyield,nitrogenrecoveryefficiencyandagronomicefficiencywere6.2%,30.49%and23.72%higherwhenthenitrogenWasappliedinthreesplitsas30%basal,20%10DAT,50%36DAT,comparedwiththatoftheNsplitsas40%basal,30%10DAT,30%36D
8、AT.However,noobviousdifferencesinthenitrogenphysiologicalefficiencyandparti
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