Comparison of Light Distribution and Fruit Yield,Quality of Two Tree Shapes in Yulu Fragrant Pear
Using 4-year-old Yulu fragrant pear trees as experimental materials,this study investigated the distribution of light intensity within the canopy of two tree shapes,umbrella-shaped and cylindrical,and their effects on fruit yield and quality.The results indicated that the relative light intensity decreased consistently from the upper to the lower layers and from the periphery to the interior of the canopy in both tree shapes.The fruit shape index was similar in both tree shapes,and single fruit weight,fruit firmness,and stone cell content de-creased gradually from the upper to the lower layers of the canopy,while the fruit shape index increased gradual-ly,and soluble solids content was highest in the middle layer,followed by the upper layer and the lower layer.However,the fruit yield of cylindrical trees was lower than that of umbrella-shaped trees,and fruit firmness and stone cell content were also lower in cylindrical trees compared to umbrella-shaped trees.Single fruit weight,soluble solids content,and titratable acidity were higher in cylindrical trees compared to umbrella-shaped trees.In conclusion,cylindrical tree shapes are more suitable for the environment of the northwest plateau,and in practical production,yield should be adjusted in combination with pruning.
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