1. Pruning of young trees: The new shoots of navel oranges grow evenly, and generally do not need pruning when they are young, just smear and control the new shoots. In order to avoid indiscriminate fertilization in cultivation, we should concentrate on applying available nitrogen fertilizer/kloc-0 for 20 days before the above-ground part, spray fertilizer outside the roots before the leaves turn green to promote them to turn green, and control fertilization in the rest time.

2, the result tree pruning:

The three-dimensional result of (1) culture. According to the characteristics of navel orange branches, such as uniform growth, stable incidence angle of main branches and good tree shape, the lower and inner branches, the lower branches and the inner and outer results of the crown are generally reserved, and the pruning should be light, and the tree shape should be kept large and small, similar to a blunt cone shape. If the fruiting branches are strong after fruit picking, well-growing branches and fruiting branches can still occur at the base of the fruit stalk in the next spring, so they should be kept without cutting. If the fruiting branches are slender and weak, they can be cut off from the base.

(2) Branch regeneration. Pruning mainly in summer can not only reduce nutrient consumption, solve the contradiction of competing for fertilizer in fruit shoots, but also stimulate the growth of autumn shoots and change the proportion of fruiting mother branches. Summer pruning in Pingyuan county, Guangdong province is generally carried out after the physiological fruit-dropping period and before the fruiting of the mother branches. Pruning in winter should be carried out after fruit picking and before spring shoots sprouting, and pruning diseases, weeds and weak branches should be combined with clearing the garden.

3. Pruning of aged trees: For trees that are seriously aged or too closed, the main branches can be renewed, generally sawed off at the base of the main branches at 70~ 100 cm, and the backbone branches will be thicker and shorter. For some old trees whose branches are still able to bear fruit, they should be pruned in order within 2~3 years to loosen the over-dense and weak side branches and keep most of the strong branches. In the updated year, a certain yield can be maintained every year, and the new shoots grow better, with less sunburn and faster recovery of high yield. Regeneration should be carried out before the germination of spring buds, and after regeneration, sun protection measures should be taken, such as wrapping or painting with straw, coating preservatives or waxing, covering the ground, etc. After regeneration, a large number of new branches often sprout, which should be pulled out in time, leaving 2-4 evenly distributed new branches on each main branch to form a new skeleton of the crown. The pruning of navel orange trees should be based on the growth situation, and the diseased leaves and dead leaves should be cut off in time to ensure good growth.