Introduction to summer pruning techniques of walnut

   summer pruning generally refers to pruning in the growing season, including sprouting, coring, branch thinning, ring peeling, pulling technique, summer pruning and so on. Its function is to adjust the contradiction between growth and fruit, improve tree light, cultivate robust fruiting branches, and increase fruit setting rate. Because summer pruning is carried out in the growing season, its effect is more direct, faster and more obvious than winter pruning, especially conducive to the formation of flower buds, so we must pay attention to summer pruning. The following will be introduced item by item.

The picture shows walnut

   1. After sprouting and sprouting, to the initial stage of shoot growth, erase and sprout and put new shoots on the back of the main branch, so as to save nutrients and improve light conditions. When it first germinates, it will no longer germinate with your hands, but it will germinate if you grow up and cut it off.

   2. In the period of rapid growth of new shoots, the top shoots of 5 cm and 10 cm are removed. During the shaping period of young trees, when the new shoots of the main and lateral branches grow to 50 cm, they are coring, which promotes the growth of secondary shoots and accelerates the formation of tree crown. The upright branches or long branches which can be used in the inner chamber of the crown and need to be controlled can be plucked at an early stage to change from upright growth to oblique growth. The length of flat oblique branches to 30 cm coring is beneficial to flower formation and reduce the node position of flower buds. In September, pick the heart of the new shoots that have not stopped growing, so that the new shoots stop growing and promote enrichment, so as to facilitate the young trees to survive the winter.

   3. In the new phase growth period, the useless upright branches and over-dense branches in the canopy were removed to save nutrients and improve the light in the canopy.

   4. In the growing season, pulling branches with small and upright angles or using angle openers to open angles, increase the angles of main branches, pod branches and other branches, change erect branches into flat oblique branches, improve the light conditions of the inner chamber, and are beneficial to flower bud differentiation.

   5. During the slow growth period of new shoots, the erect branches were cut short to cut off the unlignified parts in order to control their growth and promote branches. In a word, summer pruning of walnut is very important, which is usually carried out three times, for the first time, sprouting, de-sprouting, thinning dense branches and competing branches are carried out before the rapid growth of new shoots. The second time in the rapid growth period to select the appropriate position of the upright branch to leave about 20 cm to pick the heart to promote the secondary shoot. The flat oblique branch leaves 30 cm to remove the heart to facilitate the formation of flower bud and reduce the node position of flower bud. For the third time, from June to July, too dense branches and only growing branches were removed to save nutrients. The strong growth of secondary shoots and then pick the heart, to promote branch maturity and flower formation.