简介：FieldexperimentswereconductedintheEbroDeltaarea(Spain),from2007to2009withtworicevarieties:GlevaandTebre.Theexperimentaltreatmentsincludedaseriesofseedrates,twodifferentwatermanagementsystemsandtwodifferentnitrogenfertilizationtimes.Thenumberofleavesonthemainstemsandtheiremergencetimewereperiodicallytagged.Theresultsindicatedthatthefinalleafnumberonthemainstemsinthetworicevarietieswasquitestableoverathree-yearperioddespiteofthedifferencesintheirrespectivegrowthcycles.Interactionbetweennitrogenfertilizationandwatermanagementinfluencedthefinalleafnumberonthemainstems.Plantdensityalsohadasignificantinfluenceontherateofleafappearancebyextendingthephyllochronandpostponingtheonsetofintraspecificcompetitionaftertheemergenceofthe7thleafonthemainstems.Finalleafnumberonthemainstemswasnegativelyrelatedtoplantdensity.Arelationshipbetweenleafappearanceandthermaltimewasestablishedwithastrongnonlinearfunction.Indirect-seededrice,thelengthofthephyllochronincreasesexponentiallyinlinewiththeadvanceofplantdevelopment.Ageneralmodel,derivedfrom2-yearexperimentaldata,wasdevelopedandsatisfactorilyvalidated;ithadarootmeansquareerrorof0.3leaf.Anexponentialmodelcanbeusedtopredictleafemergenceindirect-seededrice.