秧龄、水分管理和缓2f控释肥对水稻氮素利用特征及产量形成的影响

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1、万方数据2．Effectsofslow／controlledreleasenitrogenfertilizersongrowthcharacteristicofriceunderdifferentseedlingagesandwatermanagementsThedateforthecorrespondinggrowthperiodof5-leafand7-leafdelayeddifferently,ascomparedwith3-leafindicatingthatvegetativeperiodextendedaccording

2、lyandthereproductiveperiodshortenofmiddleflong·ageseedlingrice．Tilleringdynamicsandleafareaindexwere5-leaf>3-leaf>7·leafafterfullheadingstage．Intheconsiderationofdifferentwatermanagements，maxiumtillersnumberreachedthe-highestunderfloodingirrigationcondition。However,till

3、eringdynamicsuneralternatewettinganddryingirrigationwassli曲tlyhigherthanthatunderfloodingirrigationandbothweresignificantlyhigherthancontrolledirrigation．Thechangeofleafareaindexkeptconsistent、Ⅳiththechangeoftilleringdynamics．Thebiggestfallsinleafareaindexappearedin15da

4、ysafterfullheading．Moreover，leafareaindexdeceasedby36．49％undercontrolledirrigation，30．47％underalternatewettinganddryingirrigationand32．31％underfloodingirrigationrespectively．Whentakingdifferenttypesofnitrogenfertilizerintoconsideration，slow／controlledreleasenitrogenfert

5、ilizersinceasedfilletingdynamicsandleafareaindexandwashigherthanureasinglebasalapplicationandureaapplyingwimratioofbase：tillering：earring=5：3：2．3-leafand5-leafandslow／controlledreleasenitrogenfertilizersguaranteedfilletingdynamicsandmaintainedarelativelyhigherleafindext

6、oacertaindegree，Fromfullheadingstagetomaturitystage，rootdrymatteraccumulationof3-leafand5-leafwassignificantlyhigherthanthatof7-leaf．Root／shootratioof3-leafand5-leafWassignificantlyhigherthanthatof7-leaf．Allthoseindicatedthat3-leafand5-leafcontributedtotherootdistributi

7、ondeepintothesoilandmaintainingrootactivity．Rootdrymatteraccumulation，totalrootlength，totalrootsurfacearea,totalrootvolume，deeprootdistributionandrootactivityunderslow／controlledreleasenitrogenfertilizersweresignificantlyhigherthanthatunderureasinglebasalapplicationandu

8、reaapplying、航mratioofbase：tillering：earring25：3：2．3．Effectsofslow／eontrolledreleasenitrogenfertilizersondrymat