Effect of Inter Stock 'Zhong ai 1hao' on the Structure of Spindle-shaped 'Huangguan' Pear Trees.

In order to investigate the effect of dwarfing inter stock on the structure of pear trees, investigations were made to the tree and group structure of the 4-year-old spindle-shaped 'Huangguan' pear grafted with vigorous stock (Pyrus betulaefolia stock) and that grafted with the dwarfing inter stock 'Zhong ai 1 hao' (P. betulaefolia rootstock). The results showed that the 4-year-old 'Huangguan' pear trees grafted with the dwarfing inter stock 'Zhong a 1 hao' were 2.87 m high on average, with 70.70% of short braches, converted into 21 016.0 branches per 667 m², 840.64 m² of leaf area per 667 m² with the leaf area coefficient of 1.75. On the other hand, for the 'Huangguan' trees grafted with vigorous stocks, the average tree height was 3.17 m, and the short branch proportion was 63.20%, converted into 15 806.4 branches per 667 m², 719.28 m² of leaf area per 667 m² with the leaf area coefficient of 1.55. Therefore, the use of dwarfing inter stock 'Zhong a 1 hao' had significant dwarfing effect on 'Huangguan' pear trees, which a so showed significant yield increasing effect. [ABSTRACT FROM AUTHOR]