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1、中国水稻科学(ChinJRiceSci),2017,31(4):391－399http://www.ricesci.cnDOI:10.16819/j.1001-7216.2017.6146391氮素穗肥运筹对两个杂交中籼稻叶片形态、光合生产及产量的影响1,222222112,*秦俭杨志远孙永健徐徽吕腾飞代邹郑家奎蒋开锋马均12(四川省农业科学院水稻高粱研究所/农业部西南水稻生物学与遗传育种重点实验室，四川德阳618000；四川农业大学水稻研究所，成都611130；*通讯联系人，E-mail：majunp2002@
2、163.com)EffectsofNitrogenTopdressingforPanicleInitiationonLeafMorphology,PhotosyntheticProductionandGrainYieldofTwoMiddle-seasonHybridRice1,2222221QINJian,YANGZhiyuan,SUNYongjian,XUHui,LÜTengfei,DAIZou,ZHENGJiakui,12,*JIANGKaifeng,MAJun1(InstituteofRiceandSor
3、ghum,SichuanAcademyofAgriculturalSciences/KeyLaboratoryofSouthwestRiceBiologyandGeneticBreeding,Ministryof2*Agriculture,Deyang618000,China;RiceResearchInstitute,SichuanAgriculturalUniversity,Chengdu611130,China;Correspondingauthor,E-mail:majunp2002@163.com)Ab
4、stract:【Objective】Nitrogenfertilizationhasagreatinfluenceonriceleafgrowth,morphology,photosyntheticproductionandgrainyield,especiallythemanagementofspikelet-promotingandspikelet-developingnitrogen.Theobjectivesofthisstudyaretoelucidatetheeffectofspikelet-prom
5、otingandspikelet-developingnitrogenapplicationratiosonmiddle-seasonhybridrice.【Method】Twomiddle-seasonricecombinations(Dexiang4103andYixiang3724,2whichdiffergreatlyinleafmorphologyandgrainyield)wereused.Thetotalnitrogenapplicationrateis180kg/hm,40%ofwhichisto
6、pdressedforpanicleinitiation.Fourkindsofspikelet-promotingandspikelet-developingnitrogenratios(1∶3,2∶2,3∶1,4∶0)weredesigned.Leafmorphology(includingleaflength,width,angle,leafareaindex,andgrouplighttransmittance),netphotosyntheticrate,drymatteraccumulationand
7、grainyieldweremeasuredatfullheadingandharveststage.【Result】Lowerratio(1:3)ofspikelet-promotingnitrogenfertilizercanachieveahighergrainyieldbothinthetwocombinations,anderectleafmorphology,goodleafpostureforlight,highnetphotosyntheticrateandlargedrymatteraccumu
8、lationwereobservedsimultaneously.Onthecontrary,relativelylowgrainyieldsofbothricecombinationswereobservedunderthetreatmentofhighratioofspikelet-promotingandnitrogenfertilizer.Thismightbem
