What are the technical measures for promoting flowering and preserving fruit in pomelo?

1. Promoting flowering: To make the fruit tree bloom early, in the year before fruiting, the tree's vegetative growth must be controlled, the growth center must be shifted toward reproductive growth, and flower bud differentiation must be promoted:

1. Control the vigorous growth of vertical roots, cultivate lateral roots and horizontal roots to grow abundantly, and promote flower bud differentiation;

2. Use propping, pulling, and bending on branches to increase the angle between branches and trunk, weaken vegetative growth, and promote flower bud differentiation;

3. For vigorously growing young trees, carry out 1-2 rings of girdling on lateral branches in September-October;

4. In autumn, pay attention to drainage and water control, and cut off part of the root system to cause physiological drought in the plant, so as to promote flower bud differentiation.

2. Fruit preservation

1. Increase tree nutrition, strengthen fertilizer and water management, retain leaves as much as possible, and prevent abnormal leaf drop;

2. Control flower quantity, and thin out deformed flowers and overly dense flowers;

3. Regulate spring shoots and remove summer shoots. If spring shoots grow too much, excessive nutrient consumption will worsen fruit drop, so spring shoots should be regulated after flower buds become visible. Mainly remove the vigorous spring shoots (vegetative branches) on the upper part of the canopy, flower branches with more than 5 leaves, and late spring shoots; when summer shoots sprout new buds, remove the tender shoots multiple times until fruit set begins after mid-July;

4. Control pests and diseases well: common pests and diseases include red and yellow spider mites, leaf roller moth, and resin disease, etc.; 5. Spray plant hormones: such as cytokinin, Zhibaosu, Jinyunda-120, etc.