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The analysis of leaf area is a widely used parameter for estimating vegetative growth and development, which can be obtained through mathematical models, being an effective, cheap, fast and nondestructive technique. The objective was to determine an equation to estimate the leaf area of Siparuna guianensis Aubl. from the length and/or width of the leaf blades. In this work, 300 fresh leaves of S. guianenis were scanned and analyzed with the software Imagej® to obtain the length, width and the observed leaf area. The leaf estimate was determined from linear dimensions through analysis of linear, quadratic and potential regression equations of length, width and the product between these factors as independent variables and the observed leaf area as the dependent variable. From a practical point of view, we recommend the mathematical equation obtained through linear regression by means of the length and width relationship, using the model Y=3.5833+0.6715x, with a determination coefficient of 0.9677. Therefore, the allometric model that uses the product of the linear dimensions of length and width are more suitable for estimating the non-destructive leaf area of S. guianensis, since it shows greater correlation. [ABSTRACT FROM AUTHOR]

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