Adjustment of Mathematical Equations to Determine the Area Leaf of <i>Cordia myxa</i> L.

Abstract

The objective of this study was to obtain mathematical equations through the leaf dimensions to estimate the area leaf of Cordia myxa L. 392 leaves of plants were collected, located in the municipality of São Mateus, North of the State of Espírito Santo, Brazil, 300 of which were used to adjust the equations and 92 for validation. Of all the leaves, the largest length (L) and maximum width (W) were measured, product of multiplying the length with the width (LW) and the real leaf area (RLA). Models equation first degree linear, quadratic and power were fitted, where RLA was the dependent variable as a function of L, W and LW as an independent variable. All equations were validated according to appropriate criterion. Thus, the power model () 0.9749 0.84 ELA LW = , based on the product of multiplication of length with width (LW) is the most suitable for estimating the leaf area of Cordia myxa L.

Use of Mathematical Equations to Estimate Leaf Area of Psidium Cattleyanum

“…Table 4. Observed leaf area (OLA), and estimated leaf area (ELA) from equations of linear first degree, quadratic , and power for the independent variables length (L), width (W) , and product of length , and width (LW), in addition to the p-value, mean absolute error (MAE), the root mean square error (RMSE) , and It is worth mentioning that the combined use of more than one measure in the estimation of leaf area can be more laborious in practice because it is necessary to measure one more variable (17), however, as observed in the literature, several plant species have their leaf area best estimated from the union of two variables such as, for example, length, and width (18,19,20,4,21) demonstrating that these equations have greater acceptability in the prediction of leaf area.…”