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Researches on the impact of chemical fruit thinning with ethrel upon fruits’ quality of some peach and nectarine varieties cultivated in the western part of Romania

Published in Scientific Papers. Series B. Horticulture, Vol. LVI
Written by Olimpia IORDĂNESCU, Beatrice SARKADI (MĂGURAN)

The peach tree is one of the most appreciated fruit species cultivated in the temperate climate because of the special qualities of its fruits and also because of tree’s particularities. In this article we present the impact of chemical thinning with Ethrel in different concentrations upon the content of soluble dry substance, rephractometrical determined, sugars, determined by soluble dry substance method, total acidity, determined by juice extraction and titration with NaOH, and gluco-acidimetric index. The data were collected in 2006 from 2 varieties of peach – Spring Lady and Maja, and 2 nectarine varieties – Caldesi 2000 and Nectaross cultivated in conditions of Periam, Timis County. The trees were planted at a distance of 4.0 x 2.5 m, having a density of 1000 trees/ha and the crown system is Palm Spindelbusch. The soil was maintained clean by mechanical hoes and Roundup 360 SL herbicide. Chemical thinning was done at 25 days after fruit binding, moment when the ovule (the future stone seed) had 10-12 mm, being done in four different concentrations: 125 ppm, 250 ppm, 350 ppm and 500 ppm. The results obtained showed that sugars increase in those variants where thinning was more severe (500 ppm and 350 ppm), than in those with slightly thinning (125 ppm and 250 ppm), while in the control variant the values obtained were the smallest. Total acidity had higher values in the control variant and smaller when using 500 ppm Ethrel. The differences between the varieties are given by their genetic nature and by some phenological differences at the moment of treatment. Severe chemical thinning is not recommended in commercial orchards because it reduces very much the number of fruits remained on the trees, even though they will have better physical-chemical features, having a bad impact upon the production obtained. We recommend moderate chemical thinning done with Ethrel in concentrations of 250-350 ppm, which have a good impact at the same time upon the qualitative and quantitative productions.

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