The influence of degree of hand thinning on some quality features of apples cv. Szampion
2007
Szot, I.,Akademia Rolnicza, Lublin (Poland). Katedra Sadownictwa
The experiment was carried out in a commercial orchard, located close to Lublin, between 1997 and 1999, using Szampion apple trees, grafted on M 26 rootstock. The treatments were executed in May: T1 - removal of 50 percent fruit clusters, T2 - removal of 50 percent fruit clusters and king flower left intact, T3 - removal of 50 percent fruit clusters and two lateral fruitlets left intact, T4 - removal of 50 percent fruit clusters and king flower and one lateral fruitlet left intact, after June drop were made with leaving 1 fruitlet (T5) or 2 fruitlets (T6) with a space of 20 cm between fruit clusters. Unthinned trees were left as the control. To determine the 'internal quality' of apples, 75 fruits from every treatment were sampled at the harvest date and analysed for the content of dry matter, soluble solids, sugar and acidity. The intensity of hand thinning influenced the quality of saleable yield and characteristics determined as 'internal fruit quality'. The mean quantity of saleable yield, dry matter, soluble solids and sugar content were significantly different between the years of the study. The greatest saleable yield in the two subsequent years of study was that after removal of 50 percent of all fruit clusters and leaving only king fruitlets. However, there were significant differences between most treatments and the control only in 1997. Fruits from trees where 50 percent of all fruit clusters were removed leaving two lateral fruits, had the greatest dry matter content, significantly higher than in control. There was no influence of thinning treatments on acid content in fruit in each year of the investigation
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