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1、ID#32-09LENGTHANDWIDTHTOESTIMATEDRYMASSOFPANICUMMAXIMUMCV.TANZ?NIALEAVES1112L.G.Barioni,P.M.Santos,A.ColdebellaandM.Corsi1PhDstudent.DepartamentodeProdu??oAnimal,UniversidadedeS?oPaulo,Piracicaba,SP,2Brasil,13418-900,lgbarion@carpa.ciagri.usp.br.DepartamentodeProdu??oAnimal,Universidaded
2、eS?oPaulo,Piracicaba,SP,Brasil,13418-900AbstractAnanalysisoftherelationshipofleaflength(LL)andleafwidth(LW)withleafdryweight(LDW)inPanicummaximumwascarriedoutwiththeobjectiveofimprovingestimationsoftissueflowinthatplant.Datawascollectedinamobgrazingexperimentwith28daysgrazingintervalsamp
3、ledthedaybeforegrazingin9grazingcycles.Regressionanalysisrevealedhighlysignificanteffect(P<0.001)ofbothLLandLWonLDW.Alackoffittestgavestrongevidencebofnon-linearrelationshipofLDWwithLL(p<0.05),fittingthemodelLDW=bLL1,while0LWpresentedalinearrelationwithLDW.LLwasabetterpredictorofLDWthanL
4、W.LLsolely2orincombinationwithLWproducedequationswithhighR(0.61–0.90and0.80–0.92,respectively).Thepowerrelationshipbetweenleaflengthandleafdryweightimplythatlongerleavesareheavierperunitoflengthand,thereforetheuseofaconstanttodescribedryweightmaybemisleadingwhentreatmentsaffectleafsizein
5、Panicummaximumpastures.Keywords:Leaf,model,weight,regression,PanicummaximumIntroductionLeafareaindexandleafmasshaveoftenbeenpointedoutasimportantstatevariablesinpastoralsystems,affectingonbothplantphotosyntheticpotential(HayandWalker,1989)andherbageintakebythegrazinganimals(Poppietal,198
6、1;Floresetal.,1993;ForbesandColleman,1993)andarethereforevaluableindicatorsofpasturestatus.Alsomethodologiesforquantifyingtissueflowrelyonmeasurementofleafelongationandlengthofsenescentpartofthetissue.Calculationsusuallyassumeconstantdryweightperunitoflength(usuallymm)inordertoestimateti
7、ssuemassflowrates(Grantetal.,1983).Thispaperaimstoanalyzetherelationshipbetweensizemeasurements(lengthandwidth)andthedryweightofPanicummaximumcv.Tanzanialeavesinordertoimproveestimationsofleafmassandtissueflowinthoseplants.MaterialandMethodsDatawascollectedfromamobgrazing
