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vol.21 issue2Floristic composition of weeds in agrosystems of cupuaçu (Theobroma grandiflorum) and peach palm (Bactris gasipaes)Leaf anatomical studies in weed species widely common in Brazil: IV - Amaranthus deflexus, Amaranthus spinosus, Alternanthera tenella and Euphorbia heterophylla author indexsubject indexarticles search
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Planta Daninha

Print version ISSN 0100-8358On-line version ISSN 1806-9681


BIANCO, S.; PITELLI, R.A.  and  PITELLI, A.M.C.M.. Leaf area estimation in Typha latifolia using leaf blade linear dimensions. Planta daninha [online]. 2003, vol.21, n.2, pp.257-261. ISSN 0100-8358.

This study aimed to obtain a mathematical equation to estimate the leaf area of Typha latifolia, using leaf blade linear dimensions. Correlation studies were carried out involving real leaf area and leaf length (C), maximum leaf width (L) and C * L. The linear and geometric equations involving the parameter C provided good estimates of leaf area. From a practical viewpoint, it is suggested to choose the simple linear equation of the regression model using the C*L parameter and taking the linear coefficient equal to zero, since it shows the smallest Error of Sum of Squares. Thus, an estimation of Typha latifolia leaf area can be obtained using the equation Sf = 0,9651 (C*L), with a determination coefficient of R2 = 0,9411.

Keywords : weeds; leaf area; taboa.

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