The level of photosynthetic efficiency and the dynamics of new growth are closely related to the type of branch.
Long branches, have a large photosynthetic production capacity, the photosynthetic products made in addition to meet their own consumption, but also back to supply other organs to apply. This kind of new tip transmission organization is developed, robust growth, large leaf area, strong photosynthetic capacity, is both the maker of organic nutrients, but also the regulator of tree nutrients.
But this kind of branch and leaf construction period is long, stop growing late, pre-consumptive growth, before it stops growing, leaf photosynthetic products, can only satisfy its own needs, and not outward transportation, peak long sometimes also take the lower part of the nearby branch nutrients, so as to affect the lower part of the development of the short and medium branch and the formation of flower buds.
Middle branches, new shoots and leaves construction time is short, photosynthesis days are longer, nutrients in the bud differentiation period mainly supply the apical flower buds and axillary flower bud formation. After the flower buds stop differentiating, nutrients can be transported to the mother branch and roots, so the middle branch has a seasonal regulation, but the output is not as good as the long branch.
Short branches, the photosynthetic capacity of short branches varies greatly. Large-leafed short branches with strong photosynthetic capacity. Small-leaved short branches photosynthetic capacity is weak, some have to rely on external support to maintain life. In the rapid growth period of the fruit but also a small supply of fruit needs.
Large-leafed short branches, due to the early cessation of growth, long functional period, high level of accumulated nutrients, conducive to the formation of flower buds, is the main fruit tree fruiting branch class.
The photosynthesis products of the fruiting platform sub-top, in addition to meeting its own needs, mainly supply the fruit needs. The strong growth of the fruiting platform of the deputy tip will also take the lower part of the nutrition, caused by the fall of flowers and fruits. Fruit in the early stages of development also has a greater photosynthetic capacity, but also rely on short branches and fruiting platforms to supply nutrients.
Expanded:
The link between long and medium branches:
The above types of branches, photosynthetic capacity varies greatly, but each has its own characteristics. As far as a productive tree is concerned, all kinds of branches are indispensable. Long branch is to expand the crown, the formation of the tree skeleton, cultivate large branches, regulate the nutrition of the tree important branches.
But because it is built for a long time, the first stage is consumptive growth, only later there is more nutrient return, not conducive to bud differentiation and formation. This type of branch in a tree accounted for too much proportion, then the tree tends to nutritive growth is a sign of low yield.
The middle branch has a certain degree of nutritional regulation, due to the cessation of growth earlier, photosynthetic days longer, more accumulation, conducive to the differentiation and formation of flower buds, is the beginning of the fruiting tree, the main fruiting branch class.