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Abstract The reasonable tree and population structure parameters of various cylindrical pear orchards were studied. The results showed that for 3-year-old ' Xinli No. 7· , the tree height was 3.48 m, and the trunk height was 63 cm; there were 63 branches per plant, which was equivalent to 19 971 branches per 667 m2; the leaf area index was 1.62. For the 3-year-old ' Xueqing ' , the tree height was 3.03 m, and the trunk height was 74 em; the number of branches per plant was 57 , which was equivalent to 18 069 branches per 667 m2; the leaf area index was 1.73. The cylindrical trees of the two varieties had the following characteristics: the canopy structure was tight; the branches were equally distributed, and the number of medium branches and short branches accounted for more than 60% of the total number of branches of the whole plant.
Key words Pear; Sapling; Cylindrical
Pear, a deciduous fruit tree of Pyrus, Rosaceae is one of the most popular fruits in the world &1'. The tree structure and population structure of fruit trees are the main factors influencing the yield and quality of fruit in a orchard. The tree structure of fruit trees refers to the shape structure of fruit trees and its dynamic changes. It is an equilibrium state achieved under the regulation of endogenous hormones and external environment in a specific growth stage. For instance, tree height, trunk height, total quantity of branches, and total number of leaves can be maintained at an appropriate ratio for a long time. The population structure of fruit trees refers to the interaction between fruit trees and its dynamic changes, which are controlled by factors such as planting density, tree structure and external environment. Cultivating a good tree structure and a reasonable population structure is the key to achieving high quality and high yield of fruit trees. In this paper, indexes of tree structure of two cylindrical pear orchards ( ' Xinli No. 7' and ' Xueqing' ) were investigated, and suitable tree and population structure parameters for cylindrical pear orchards were studied to provide reference for production.
Materials and Methods
General situation of the test orchards
In November 2017, the test was conducted in...