Pay attention to the characteristics of the variety. Because of different apple varieties, their germination and branching ability are also different. Varieties with strong budding ability and branching ability can easily cover the canopy. When pruning in winter, it is necessary to increase the amount of pruning and adopt more sparse and less cutting to improve the light conditions. On the contrary, for varieties with weaker budding power or branching power, the amount of pruning should be handled lightly and properly thrown away. As long as the tree is strong and the flower buds are sufficient during the re-pruning, it is necessary to keep more flower buds to allow the tree body to bear the burden reasonably. Pay attention to the strength of the tree. For apple trees of the same species and age, the amount of pruning should be light and slow, to promote the formation of flower buds and increase fruit yield; while for the old and weak trees, the pruning should be based on short cuts. Cut and promote the emergence of new branches to restore the tree vigor as soon as possible; but for senescent trees that are too old, they must be pruned by means of re-retraction. When re-cutting, we must use the technical means of ***, pay attention to cultivating the branch group, and consolidate the branch group. Pay attention to the flower buds. On the premise that the flower buds can be accurately distinguished, for apple trees with many flower buds, pruning with broken flowers should be adopted, and more top flower buds should be left. For bunch-like flower buds, choose to leave at most 2-3 full flower buds, and adjust the ratio of flower buds to leaf buds. It is 1:3-5. For young trees with few flower buds, keep as many flower buds as possible. For the fruiting branch group without flower buds, it is necessary to re-cut and update appropriately to lay a good foundation for next year's results. Pay attention to the pruning response. Before starting the re-cutting, carefully observe the pruning response in the first year to determine the degree of pruning and re-cutting in the current year. First of all, it is necessary to clarify the auxiliary and promotion effect on the backbone branches, while the auxiliary branches are to control the utilization relationship, and then for those fruiting branches that need to be renewed and rejuvenated, those that need to continue to be cultivated. If you can't see the branches, start at the beginning, otherwise the tree that has just eased up will become prosperous or prosperous, delaying the normal fruiting period. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone
Intermediate – Intermediate: A material produced during a drug substance processing step that must undergo further molecular modification or refinement to become a drug substance. Intermediates may or may not be isolated. Intermediates are the key products of the previous process of making APIs, which are different in structure from APIs.
Ceftriaxone sodium powder is called preparation, sterile ceftriaxone sodium is called API, and 7-ACA is called intermediate.
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Intermediate is a very important type of fine chemical products. Its essence is a type of "semi-finished product", which is an intermediate product in the production of certain products. For example, if a product is to be produced, it can be produced from intermediates, saving costs and reducing It is widely used in the synthesis of medicines, pesticides, coatings, dyes and spices. In the field of medicine, intermediates are an important link in the industrial chain of the pharmaceutical industry. They are used for some chemical raw materials or chemical products in the process of drug synthesis. In a word, they are used to produce APIs.
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for example:
Amoxicillin capsules are called preparations, amoxicillin is called API, and 6-APA is called intermediate.
Pay attention to these four points when re-cutting apple trees in spring