Crop load adjustment in Golden Reinders apple trees using different methods of thinning
2017
Peşteanu, A. (State Agrarian University of Moldova, Chisinau (Republic of Moldova) | Calestru, O.
The experiment was carried outin the orchard of the company “Codru-ST” (Republic of Moldova), established in 2009 with trees of ”knip boom” type. The object of the research was Golden Reinders apple variety grafted on M9 rootstock. Planting distance is 3,5 x 1,2 m. For adjusting crop load different thinning methodswere used: 1. without thinning (control); 2. manual thinning of fruits, which was performed after their physiological fall when they were 1.5-2.0 cm in diameter; 3. Spraying with Geramid New, 1.5 l/ha, after the fall of 80% of the petals + 2-3 days; 4. Spraying with Geramid New, 2,0 l/ha, after the fall of 80% of the petals + 2-3 days; 5. Two sprayings with Geramid New, 1.0 l/ha +1.0 l/ha: the first spraying was done when 80% of the petals had fallen + 2-3 days; the second spraying was performed when the diameter of the central fruit was 6 mm. The research was conducted during the years 2015-2016. The number of blossom clusters before and after the thinning, the number of fruits per tree and per 100 flower clusters as well as the yield and average fruit weight and diameter were evalu-ated. It was established that, the treatment with Geramid New reduced the amount of fruit-bearing inflorescences by 41.9-51.5%, which eventually allowed a more rational placement of the fruits in an inflorescence. The highest average fruit production was recorded in the Geramid New variant at the rate of 1.5 l/ha - 50.69 t/ha. It was by 85.2% higher compared to the control variant.
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