SciELO - Scientific Electronic Library Online

 
vol.27 special issueGermination of small bengal dayflower (Commelina benghalensis) aerial seedsGrowth and yield of corn grain and green ear in competition with weeds author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Planta Daninha

Print version ISSN 0100-8358

Abstract

BIANCO, S; CARVALHO, L.B; PANOSSO, A.R  and  BIANCO, M.S. Determination of the leaf area of Merremia aegyptia. Planta daninha [online]. 2009, vol.27, n.spe, pp. 941-945. ISSN 0100-8358.  http://dx.doi.org/10.1590/S0100-83582009000500007.

Weed leaf area knowledge can provide a support to study the relationships of interference between weeds and crops. The objective of this research was to determine a mathematical equation to estimate the leaf area of Merremia aegyptia based on the relation among the linear measures of the leaf blades. Leaves of this species were gathered from different places at Sao Paulo State University, Jaboticabal, Brazil, by measuring length (L), maximum width (W,) and leaf area of three types of leaflets. Linear equations (Y = a*X) were estimated for each type of leaflet. The leaf area of the species can be estimated by the sum of the leaf areas of each leaflet type according to the equation LAest = 0.547470(X) + 1.145298(Y) + 1.244146(Z), where X indicates L*W of the main leaflet, and Y and Z indicate the medium L*W of the primary and secondary leaflets, respectively.

Keywords : weed; growth; hairy woodrose.

        · abstract in Portuguese     · text in Portuguese     · pdf in Portuguese