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A mensuracao da area foliar e requerida em varios estudos agronomicos, ecologicos e biologicos de uma maneira geral. O objetivo deste trabalho foi obter equacoes de regressoes lineares e nao lineares que estimem a area foliar real da especie jitirana, em funcao das dimensoes do comprimento ao longo da nervura principal (C) e largura maxima (L). Para isso 200 limbos foliares foram coletados em ecossistemas de ocorrencia natural desta especie vegetal, na regiao de Mossoro, no Estado do Rio Grande do Norte, limpas e acondicionadas em caixa de isopor e medidas imediatamente, inclusive sua area real atraves do Integrador de Area foliar. Considerando a parcimonia do modelo, o coeficiente de determinacao e a significância do teste F da analise de variância a 3 % de probabilidade, as melhores equacoes para estimacao da area foliar da jitirana em ordem de importância foram: modelo linear simples passando pela origem em funcao do produto do comprimento com a largura da folha; linear simples em funcao do comprimento; linear simples em funcao da largura; e o modelo de regressao linear multipla, modelada em funcao do comprimento e largura simultaneamente. Onde Merremia aegyptia apresentou valores medios de comprimento das folhas, largura e area foliar real iguais a 13,5 cm, 28,8 cm e 202,38 cm 2 , respectivamente. 95% da area foliar de 200 limbos esta relacionada com folhas de tamanho variando de 133,3 cm 2 a 299,0 cm 2 . Estimation of leaf area “scarlet starglory” ( Merremia aegyptia (l.) Urban) through regression models ABSTRACT - The measurement of leaf area is required in several agronomic studies, ecological and biological processes in general. The objective of this study was to obtain equations of linear and nonlinear regressions to estimate the real leaf area of Scarlet Starglory, depending on the dimensions of length along the main vein (C) and width (L). For this 200 leaves were collected in areas of naturally occurring ecosystems of this plant species in the region of  Mossoro, in Rio Grande do Norte state, Brazil, the plants were cleaned and wrapped, then they were measured immediately through Integrador of Area to foliate. Considering the parsimony of the model, the coefficient of determination, and the significance of the F test of analysis of variance of 3% probability, best equations that estimated the leaf area were in order of importance was: the model lineal simple going by the origin in function of the product of the length with the width of the leaf; lineal simple in function of the length; lineal simple in function of the width; and the model of multiple lineal regression, modeled in function of the length and width simultaneously. Where Merremia aegyptia apresentau medium values of length of the leaves, width and area to foliate real iguias to 13.5 cm, 28.8 cm and 202.38 cm 2 , respectively.

Estimação da área foliar da “jitirana” (Merremia aegyptia (l.) Urban), através de modelos de regressão para Mossoró - RN