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1、S.LON等：氮在水稻中的行为及其品种间的差别651BehaviorofNwithinRicePlants,ComparingbetweenJaponicaandIndicaVarietiesS.LON1,CHENNeng-chang1,2,N.CHISHAKI1,S.INANAGA11.LabofPlantNutrition,FacultyofAgriculture,KagoshimaUniversity,Kagoshima890-0065,Japan2.GuangdongInstituteofEcology,EnvironmentalandSoilSciences,andGuangd
2、ongKeyLabofIntegratedControlofAgro-environment,Guangzhou510650,ChinaAbstract:ToinvestigatethebehaviorofNwithinriceplants,Japonica(Hinohikari)andIndica(Hadsaduri)typesweregrownintheculturesolutioninagreenhouse.Thenitratenitrogen(NO-3-N)orammoniumnitrogen(NH4+-N)labeledwith15Nweresuppliedtobothplan
3、tsforoneweekattillering,panicleinitiationandheadingstages.Thericeplantwasharvestedimmediatelyafterapplicationof15Natpanicleinitiationandheadingstagerespectively.BythedeterminationofNO-3-NandNH4+-Ninthesolutionculture,the15Namountabsorbedfromtherootduringoneweekwascalculated.Allharvestedplantswere
4、separatedintotheroots,vegetativepartsorears.AfterthetotalnitrogenineachplantpartwasdeterminedbytheKjeldahlmethod,the15Nwasanalyzedbyemissionmethod.BycomparingbetweenJaponicaandIndicaplantsinallgrowthstages,itisshownthatthe15NamountabsorbedwithbothNH4+-NandNO-3-NremainedmoreintheJaponicathanintheI
5、ndica,whilecomparingbetweenNH4+-NandNO-3-Ntreatments,15NamountabsorbedwithNH4+-NremainedmoreinthebothplantsthanthatwithNO-3-N.Atmaturitystage,15NamountabsorbedwithbothNforms,observedinears,remainedmoreinJaponicathaninIndica.Theresultsuggeststhat15Namountremainedinriceplantsweredifferentbetweenvar
6、ietiesandsupplyingNformandamongNsupplyingperiod.Keywords:nitrogen;rice;variety;Nloss;growthstageCLCnumber:S13Documentcode:AArticleID:1672-2175(2004)04-0646-05S.LON等：氮在水稻中的行为及其品种间的差别651Nitrogennutritionofriceplantshaslongbeenahotresearchtopicbecausericeistheworld'smostimportantcerealcropsandnitrog
7、enisthecostlyfertilizersinriceproduction.RaunandJohnson[1]estimatedcurrentnitrogenuseefficiency(NUE)ofworldwidecerealproductiontobenear33%,indicatingthatmuchoftheappliedfertilizernitrogen(N)isnotutilizedbytheplantandis
