High-temperature top grafting and variety changing method for pomelo trees

The invention discloses a high-temperature top grafting and variety changing method for pomelo trees. The method comprises the following steps of picking down and storing scions, pruning rootstock, grafting the scions to the rootstock, and finally performing post-grafting treatment. Pruning treatment on the rootstock specifically comprises the following steps of after a parent fruit tree is selected, pruning branches of the parent fruit tree, and reserving 3-5 main branches or side branches which extend outwards and are not staggered with each other as the rootstock and 3-5 thin and weak branches with the diameter of 0.2-0.5 cm as auxiliary branches and water eliminating branches. According to the high-temperature top grafting and variety changing method for the pomelo trees, the rootstockis pruned selectively, the thin and weak branches are reserved, so that root systems absorb nutrients and moisture from soil, meanwhile, the moisture conveyed to grafting openings and the moisture needed by scion growth are