Colour and water content detection of sweet cherry by portable spectrometer

A Nagy,Z Szabó,J Nyéki,M Soltész,J Tamás

doi:10.31421/ijhs/17/4-5/962

Abstract

Based on the most recent data, the average amount of sweet cherry produced in Hungary is around 10-12 thousand tons. Therefore fast and effective method is important for sweet cherry fruit quality analyses. The aim of the study was to examine the applicability of reflectance measurements for sweet cherry fruit quality analyses. In our experiment five cherry species (Vera, Cristalina, Germersdorfi, Noir de Mechet, Canada Giant) were examined in order to measure the spectral differences between species. Further more, spectral alteration was examined between different health and maturity status of the fruits in the case of a specified, the Germesdorfi species. The four new indices are appropriate tools for cherry quality analysis. Thus reflectance measurements can also support more precise and automated fruit selections. The methods for the differentiation of species could also be viable at a concerned habitat; however, the climate, habitat and soil conditions strongly affect the yield quality. Concerning the fast determination of water content, WBI could be a reliable method for the assessment

Highlights

The total sweet cherry production of the world ranges between 1.4 and 1.6 million tons
The Hungarian sweet and sour cherry breeding has been going on since1950
The characteristics of the reflectance curves of each fruit species are caused by the large amount of absorption of anthocyanin content at 450–570 nm wavelength intervals

Summary

Introduction

The total sweet cherry production of the world ranges between 1.4 and 1.6 million tons. Europe has a leading role as more than 50% of sweet cherry is produced here. The Hungarian sweet and sour cherry breeding has been going on since1950. Sweet cherry varieties in the National Variety List are the following: ‘Margit’ (1987),‘Linda’ (1988), ‘Katalin’ (1989), ‘Alex’(1997), ‘Kavics’ (1999), ‘Vera (2002), ‘Rita’(2004), ‘Petrus (2007), ‘Paulus’(2007), ‘Aida’ (2007), ‘Carmen (2007) ‘Tünde’(2008), ‘Sándor’(2008) (Apostol, 2011). The total area of new orchards planted between 1998 and 2005 with governmental support is 750 ha, out of which the intensive orchards with a plant density above 1000 trees/ha make up for only 3.3%. The following foreign cultivars were planted by the Hungarian producers: cvs. ‘Sunburst’, ‘Stella’, ‘Regina’, ‘Valerij Cskalov’, ‘Sylvia’, ‘Sweetheart’ and ‘Krupnoplodnaja’ (Thurzó, 2008)

Objectives

Methods

Results