施肥方式对水稻根系生长、养分吸收与土壤养分分布的影响

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1、万方数据华中农业大学2015届硕士研冗生学位论文andnutrientabsorptionunderlowandhighnitrogenfertilizerapplication，respectively．MtIlthegrowthofriceroot，nutritionoffertilizationinshallowwasinshortsupplyinlatestage．Therootgrowth，grainyield，nutritionabsorptionandnitrogenuseeffi

2、ciencyofseparatedlayerfertilizationwerehigherthanothers．Itincreasedthenumberofdeeprootandimprovedthelodgingresistanceofrice．netrendofsoilinorganicnitrogenmigrationWasobviouswiththewater．NitrogeninthesoilcouldnotbeabsorbedbyricerootandeasytolOSSwhenfe

3、rtilizerwasaway10cmfromthesoilsurface．Thereforeseparatedlayerfertilizationshouldkept0-5cminshallowsoiland5-10cmindeepsoil．(3)Resultsshowedthatthebiomass，rootbleedingsapanditscompositionofrootzonefertilizationtreatment(T2)Wassignificantlyhigherthanoth

4、ersattiUeringstage．晒enricewasharvested!biomassesandnutritionabsorptiondeclinedfirstandthenrosewiththeincreasingoffertilizationsiteclosetorootzoneandtreatmentT3showedthehighest．Thetreatmentoffertilizationsitemorethan8cmclosetorootzonewassignificantlyl

5、owerthantreatmentT1．SoilavailablenutritioncontentoftreatmentTIhadnosignificantdifferenceswithothersattilleringstage，andbecamehigherthefartherfertilizationsiteclosetorootzone．SoilnutritioncontentinrootzonecompartmentoftreatmentT2wassignificantlyhigher

6、thanothers．Ofallthedifferencesamongtreatments，thegreatestoneWasavailablephosphorus，availablepotassiumtooksecondplace，andtheleastoneWasinorganicnitrogen．Soilnutritioncontentinrootzonecompartmentdeclinedmoststeeplyinharvesttime．Soilavailablenutritionco

7、ntentinrootzonecompartmentoffertilizationsiteclosetorootzonewashigher．Itcouldpromotericeyieldformationandincreasenutrientabsorption．ThenutritionmigratingtoricerootWaslimitedanddifficulttobeabsorbed，iffertilizationsiteWasmorethan8cmclosetorootzone．Key

8、word：Fertilizationdepth；Fertilizationdistance；Rice；Root；Biomass；Nutritionefficiency；Soilnutritiondistribution万方数据施肥方式对水稻根系生长、养分吸收及土壤养分分布的影响1绪论1．1水稻生产及发展现状水稻是全世界重要的粮食作物之一，其种植面积及产量在世界粮食生产中均占重要的地位。统计资料显示，全世界一半以上的人口以稻米为主食，而世界上水稻的种植区主要集中在亚洲地区(申建波等，2006)，其