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Scion varieties , red and gold , interstocks GM256 the base anvil Shan Viticis , as test materials , interstocks GM256 gold red apple dwarfing effect and saplings annual pruning reaction , in order to improve the yield and fruit quality biology and morphology provides a theoretical basis and practical foundation and complete pruning techniques for the early high . To carry out the early high technology research , promotion and development of the province and the northern cold regions of dwarf apple has an important use and reference value . The main findings are as follows : between 1.GM256 dwarfing rootstock gold red apple dwarf . Seven years old tree height than the control varieties reduced by 30% , cumulative production was increased by 3.55 times , the soluble solids content of 15 % , the VC content 55.33mg/100gFW , decline in fruit firmness , coloring enhancement . 2 the the GM256 Interstock the production of high - quality red and gold apples, spacing should not be less than 15m, fruit sticks should be greater than 2.5:1 ; 2 × 3.5M density , fruit yield , stable yield , high-quality suitable load of 15.5 - 18.0kg / strains . Dwarf golden red apple saplings annual branch pruning should be light pruning slow release mainly due stubs ( cut to stay branch length 1/3-3/4 ) to increase the total amount of growth year -old branches , promote vegetative growth , expand the crown , to increase the amount of foliage . Jilin Province, saplings suitable for topping the period from late May to early June , the annual shoots grow to 30cm ; Shuhuashuguo appropriate period of full bloom to physiological fruit drop of nearly a month of time can be up to per inflorescence stay two fruit appropriate ; suitable leaf to fruit ratio of 15-20:1 . 5 . dwarf rootstock GM256 is conducive to the red and gold apple tree reproductive growth and accumulation of tree , which is conducive to early results , as early as high yield .
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