Estimação da área foliar de Crotalaria juncea por dimensões lineares das folhas

Abstract

The objective of this work was to estimate the Crotalaria juncea leaf area by linear dimensions of the leaves. Two experiments were conducted with C. juncea IAC-KR1 in 2014/2015 sowing seasons. At 59, 82, 102 and 129 days after sowing (DAS) of the first and at 61, 80, 92 and 104 DAS of the second experiment, 500 leaves were collected, totaling 4,000 leaves. In each leaf, were measured the linear dimensions (length, width and the product length×width) and determined the leaf area by Digimizer and Sigma Scan Pro softwares, after scanning images. Then, 3,200 leaves were separated randomly to generate mathematical models of the leaf area (Y) as a function of linear dimension (x) and 800 leaves were separated for the validation of models. In C. juncea, the models of leaf area depending of the product length×width presented higher adjustments to the obtained based on the evaluation of just one linear dimension (length or width). The linear model Ŷ=0.7390x (R² =0.9849) of the leaf area (Ŷ) depending of the product length×width (x) is suitable for estimation of C. juncea leaf area.