Grafting technique of young fruit of Shatian pomelo

When Shatian pomelo trees enter the fruiting stage, some orchards blossom and bear more, some orchards blossom and bear less, some trees blossom and bear more, and some trees blossom and bear less in the same orchard. In order to change this unbalanced phenomenon, ease the excessive growth potential of the first fruit tree, promote flower bud differentiation and early fruiting, the young fruit thinned from the tree or branch with more fruit can be grafted immediately to the overgrowing young tree or branch by the method of young fruit grafting, which can not only reduce the yield loss caused by fruit thinning, but also balance the growth, inhibit the growth potential of prosperous branches, and promote its flower bud differentiation. The time of young fruit grafting in South China is from late May to early and mid-June (after the second physiological fruit drop). The grafted objects are young trees with less fruit, young trees without blossom and fruit or young trees with uneven distribution of fruit in the crown. The specific operations are as follows: from the Shatian pomelo trees that bear too much fruit, especially on the branches with dense fruit or multi-fruit branches that need to be sparse, select the young fruit with a transverse diameter of 2ml / cm, and carefully cut it from the stalk 1.5-2cm long; immediately treat it with 500-fold methyl topiramate, and graft it into the above-mentioned trees with little or no fruit. The spring shoot of the grafted object should grow sturdily, with more than 4 leaves, and the thickness of the shoot should be consistent with the thickness of the fruit stalk that was cut off, so as to facilitate cutting, and the spring shoot incision should be disinfected with 500-fold methyl topiramate and immediately wrapped with plastic film (11340, 15.00, 0.13%). When grafting, the grafted young fruit should be reasonably and evenly distributed in all directions of the crown, the hanging fruit amount should be determined according to the tree potential, and the specific number of grafted young fruit should be determined according to the survival rate of 50%. Management of young fruit after grafting: the new shoots germinated on the grafted young fruit trees were wiped out in time, and the survival rate was checked 10 days after grafting. The young fruits that did not survive will fall off by themselves, and the film can be removed after two months of grafting.