棉花功能叶不同位点某p某某值与植株氮素、施氮量相关性分析

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1、IVCorrelationbetweenSPADValueinDifferentSitesofCottonLeafandNitrogenContentofPlant,NitrogenApplicationRatioAbstractThereisastrongcorrelationbetweenthechlorophyllcontentofleafandnitrogencontentofplant,alsothereisagoodcorrelationbetweenSPADvaluegottenfromSPAD-502Chlorophyllmeterandtheleafchlorophy

2、llcontent.So,theSPADvaluecanbeusedtopredictthecropnitrogenstatus.BecausethesizeofcottonleafismorebiggerthanthetestsiteofSPAD-502Chlorophyllmeter,itisimportanttodecidethemostsuitabletestsiteofSPAD-502Chlorophyllmeterincottonleaf.AfieldandtwoculturesolutionexperimentswereconductedandtheSPADvaluesm

3、easuredat17sitesindifferentcottonleafwereusedtoinvestigatethecorrelationbetweennitrogennutritionstatusofcottonplantandleafSPADvalueunderdifferentnitrogenapplication.Mainresultsare:(1)Thetipareaofthereversed4thcottonleaffromtheapexofthemainstemisthebesttestingsiteforSPADvalue,becausethereissignif

4、icantcorrelationbetweenthenitrogencontentandSPADvaluesofthe4thleaf,andotherleavesdon’thaveit.ThecorrelationbetweenthenitrogennutritionandSPADvalueswasalsodifferentindifferentdeterminesitesofinversefourthleaf,whichS3(neartipofleaf)showedthebestsignificantcorrelationbetweenSPADandNconcentrationofc

5、ottonshoot.TheresultssuggestthatthelocationofneartipofleafininversefourthleafwasthemostappropriatesitetoestimatethenitrogennutritionstatusofcottonwithSPADvalue.(2)ItisnotsuitabletodetermineorpredicttheconditionofthesoilnitrogenunderfieldconditionsonlyusingSPADvalues.Theresultsshowedagoodcorrelat

6、ionbetweenthecottongrowthandnitrogenapplicationrateatdifferentgrowthstages,andinadditiontolateboll,thecottongrowthwasincreasedsignificantlywiththenitrogenfertilizerincreasinginV-2therangeof0-400kg·hafornitrogen.Theresultsofculturesolutionexperimentshowedthatthereisagoodcorrelationbetweenthenitro

7、genapplicationrateandtheamountofcottongrowth,nitrogenuptake,leafnitrogencontentandleafSPADvalue,andthecorrelationcoefficientwasthe0.785,0.876,0.984and0.878,respectively.However,underfieldconditions,itonlyshowedsameresultsint