SciELO - Scientific Electronic Library Online

vol.59 issue4Phytomass mapping of the "seridó caatinga" vegetation by the plant area and the normalized difference vegetation indecesCalibration and test of the cropgro-dry bean model for edaphoclimatic conditions in the savanas of Central Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Scientia Agricola

On-line version ISSN 1678-992X


BOVI, Marilene Leão Alves  and  SPIERING, Sandra Heiden. Estimating peach palm fruit surface area using allometric relationships. Sci. agric. (Piracicaba, Braz.) [online]. 2002, vol.59, n.4, pp.717-721. ISSN 1678-992X.

Fruit surface area is an important trait in studies of developmental physiology, as well as in entomological and phytopathological research, where damage caused by insects and/or microorganisms needs to be quantified. Nonetheless, direct measurement of this trait is difficult, not very precise and destructive. This study establishes allometric relationships to estimate the surface area of peach palm (Bactris gasipaes Kunth, Palmae) fruits. Five fruits were harvested, at different maturation stages, from each of 18 plants. Image digitalization and edition methodology was adapted and compared with the traditional gravimetric method. Regression analysis and curve fitting were used to compare the two methods and establish allometric relationships among fruit surface area and fruit weight and size. The method based on image digitalization was twice as fast as the gravimetric method. Curve fitting for all pairs of independent and dependent variables was better with the image method. For most relationships, the best model was the exponential function (Y = axb), although, due to its simplicity, the linear model is also adequated. The best allometric estimates of fruit surface area (Y) were obtained using the product of fruit length by maximum width (x) were: Y = 2.077 x 1.189 (R2 = 94.8%); and Y = - 6.261 + 3.961 x (R2 = 94.5%). Traits needed to establish this relationship are easily measured and non-destructive in nature. Validation of the allometric equations is essential when applied to other populations or landraces.

Keywords : Bactris gasipaes; pejibaye; area estimation; curve fitting.

        · abstract in Portuguese     · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License