The objective of this study was to adjust a mathematical equation to estimate the leaf area of Psidium cattleyanum from the linear dimensions of the leaves. For that, 260 leaves were digitized and the length (L), width (W), product of the multiplication of length and width (LW) and observed leaf area (OLA) were obtained. First degree linear, quadratic and power model equations were fitted, where the OLA was used with the response variable as a function of L, W or LW as an explanatory variable. All models were validated with a sample of 50 separate leaves for this purpose. Thus, the first-degree linear model equation obtained from the product of multiplying the leaf length and width can be used accurately and without the need to destroy the leaves to estimate the leaf area of Psidium cattleyanum.
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