The aim of this study was to obtain a mathematical equation to estimate the leaf area of Brachiaria plantaginea using linear leaf blade measurements. Correlation studies were conducted involving real leaf area (Sf) and leaf length (C), maximum leaf width (L) and C*L. The linear and geometric equations involving the parameter C provided good leaf area estimates. From a practical viewpoint, the simple linear equation of the regression model is suggested using the C*L parameter i.e., taking the linear coefficient equal to zero, which shows the smallest Error of Sum of Squares. Thus, a leaf area estimate of Brachiaria plantaginea can be obtained using the equation Sf = 0.7338 (C*L), with a determination coefficient of R² = 0.8754.
Brachiaria plantaginea; growth analysis; weeds
