Abstract
Knowledge of the weed leaf area may give support to study the interference relationships between weeds and crops. The objective of this research was to determine a mathematical equation for M. cissoides leaf area estimation based on the relationship between the leaf blade linear measures. Leaves of the species were collected from a variety of agroecosystems at São Paulo State University, Jaboticabal, São Paulo State, Brazil, measuring the length (L), maximum width (W) and real leaf blade area of the three kinds of leaflets. Linear equations Y = a x (X) were estimated for each kind of leaflet. The confidence intervals of the primary leaflet equation overlapped those ones from the secondary leaflet equation, and then only one equation was considered for these leaflets. So, an equation of principal leaflet plus that one of primary + secondary leaflets were used to determine the M. cissoides leaf area. Thus, the leaf area of the species might be determined by the sum of the leaf areas of the principal leaflet with the primary + secondary leaflets, according to the equation LAest = 0.501 x (X) + 2.181 x (Z), where X indicates L x W of the principal leaflet and Z indicates medium L x W of the primary + secondary leaflets, respectively.
Highlights
IntroductionConvolvulaceae, is an indigenous plant to Tropical America (LEJOLY; LISOWSKI, 2001; VITAL et al, 2008)
Merremia cissoides, Convolvulaceae, is an indigenous plant to Tropical America (LEJOLY; LISOWSKI, 2001; VITAL et al, 2008)
One hundred leaves with no injury caused by insects, fungi or weather conditions were randomly gathered from M. cissoides plants in flowering stage, and the leaf blades of the three kinds of leaflets (Figure 1) were separated
Summary
Convolvulaceae, is an indigenous plant to Tropical America (LEJOLY; LISOWSKI, 2001; VITAL et al, 2008). This species is important as ornamental due to its showy flowers; it may cause serious problems to mechanical harvest due to its climbing growth habit (KISSMANN; GROTH, 1999). The negative effects of Convolvulaceae weed species on crop harvest were recently affirmed by Hager and Nordby (2007) and Davis (2008). Agronomy described as a leading weed on sugar cane, a very important crop in Brazil (KUVA et al, 2007, 2008). The M. cissoides biology must be studied better for giving support to research on crop protection
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