Increase quantity and quality of apple fruit by normalization of load by different methods of thinning

Abstract

Investigations were conducted in the years 2009-2010 in apple orchard in SA Zubreşti planted in the spring of 2003, with 4x2 m planting scheme. Trees are driven by thin spindle-shaped crown improved. We studied the apple fruit thinning by chemical thinning, manual and mixed in 3 varieties Golden Delicious, Idared and Florina, grafted on rootstock M26. It was determined blossoms number, fruit number, weight and quality. The number of blossoms Idared variety in control variant is 96 peaces/tree and almost doubled in version 2 reached the threshold of 200 pieces/tree. In the other two variants blossoms number is 50 percent higher in variant 3, respectively, 53.3% in April compared to the control variant.