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1、核农学报2009,23(6):1065～10691065JournalofNuclearAgriculturalSciences文章编号:100028551(2009)0621065205不同耕作方式下水分管理对水稻氮素吸收利用的影响1,234333徐世宏梁天锋曾华忠江立庚丁成泉张玉(1.中国农业大学人文与发展学院,北京100083;2.广西农业技术推广总站,广西南宁530022;3.广西大学作物栽培学与耕作学重点实验室,广西南宁530005;4.广西农业科学院水稻所,广西南宁530007)15摘要:2008年早季和晚季,以桂旱1号和金优
2、253为试验材料,利用N示踪技术研究了盆栽条件下湿润灌溉、交替灌溉、水层灌溉3种水分管理模式下和免耕、常耕2种土壤耕作方式下水稻氮素与吸收利用的差异。结果表明:(1)湿润灌溉栽培降低了2种耕作方式水稻的氮肥吸收量,其中对基肥和分蘖肥吸收量的降低达显著水平;(2)湿润灌溉栽培时施入稻田中的氮肥被当季水稻吸收利用的比率下降,在土壤中的残留比率增加;(3)常耕条件下,湿润灌溉水稻氮素吸收总量明显低于水层灌溉和交替灌溉水稻,但免耕条件下湿润灌溉对水稻氮素吸收总量的影响比较小;(4)湿润灌溉时水稻产量和氮素的生产效率下降。15关键词:水稻;N示踪技
3、术;免耕;常耕;氮素利用INFLUENCEOFWATERMANAGEMENTANDTILLAGEPATTERNSONNITROGENUTILIZATIONOFRICE1,234333XUShi2hongLIANGTian2fengZENGHua2zhongJIANGLi2gengDINGCheng2quanZHANGYu(1.CollegeofHumanitiesandDevelopment,ChinaAgriculturalUniversity,Beijing100083;2.GuangxiAgriculturalTechnologyE
4、xtensionGeneralStation,Nanning,Guangxi530022;3.KeyLaboratoryofCropCultivationandFarmingSystemofGuangxiUniversity,Nanning,Guangxi530005;4.RiceResearchInstitute,GuangxiAcademyofAgriculturalsciences,Nanning,Guangxi530007)Abstract:TakingthericevarietiesofJinyou253andGuihan1as
5、material,potexperimentswereconductedtoevaluate15nitrogenutilizationbyriceusingNtracertechniquesintheearlyandlateseasonsof2008.Experimentwascarriedoutunderthreewatermanagementmodes(wetting,alternationandwaterlayerirrigation)andtwotillagespatterns(notillageandconventionalti
6、llage).Theresultsshowedthat:(1)Wettingirrigationreducedricenitrogenuptakefromfertilizerunderbothtillagepatterns,andthedifferencesweresignificantforthebasalandtilleringfertilization.(2)Morenitrogenfromfertilizerwasabsorbedbyriceplantsandlesswasreservedinsoilunderwettingirr
7、igationcondition.(3)Nitrogenuptakebyriceplantsunderwettingirrigationconditionwasobviouslowerthanthatwithalternationorwaterlayerirrigationundertheconventionaltillagepattern,buttheinfluenceofwettingirrigationonnitrogenuptakewaslessundernotillagepattern.(4)Grainyieldandnitro
8、gengrainproductionefficiencywerereducedunderwettingirrigationcondition.15Keywords:rice;Ntracerte
