A simple allometric model for estimating blueberry fruit weight from diameter measurements

Abstract

Abstract. Monitoring of fruit growth is a measurement widely used in physiology and agronomy 27studies. This is normally done from detached fruits, which can lead to erroneous results when fruits 28 grow asynchronously in clusters as occurs in blueberry plants (Vaccinium spp.). The aim of this 29 communication is to develop a simple allometric model for estimating blueberry weight from 30 diameter measurements. In three growth seasons, weight and diameter of a total of 416 fruits were 31 measured from four field-grown blueberry cultivars. The obtained data set was then randomly 32 divided resulting in 200 data for calibrating model and 216 for validating. Prior to calibration 33 procedure, the use of cultivar-specific models or a common model for four cultivars was evaluated 34by Analysis of Covariance between logarithm transformed diameter and cultivar/season variables. 35From analysis, no interactive effect was observed, so a common allometric model was constructed, 36 giving a power functional relationship between berry diameter and weight. The allometric model 37 was validated with the independent data, giving errors ranging from 4.7% to 6.9%. Residuals 38 showed a random dispersion pattern. Our results showed that a common model was adequate for 39 providing a reliable means of estimating blueberry fruit weight of different cultivars. 40 41

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