In autumn, the decrease of temperature makes the growth potential of seedlings weaker and weaker, and finally enters a dormant state, and deciduous trees begin to shed leaves in this process. Pruning does relatively little harm to the tree at this stage. Cut all or part of the leaves short and remove dead branches and over-dense branches. At the same time, the branches damaged by transportation will also be pruned. For flower buds differentiated in early autumn, such as plum and peach, measures such as twisting tips can be taken to control the vegetative growth of their branches and preserve nutrients for flower bud differentiation.

Note: It is best to apply some special wound healing agents to the trimmed wound, such as "Hao Guitian-Yi Shu", which can effectively prevent wound infection and accelerate wound healing.

? Second, irrigation.

In autumn, the climate is dry, and trees have a great demand for water, especially the newly planted trees in spring that year. In early autumn, water properly to prevent autumn drought. By the end of June, 5,438+10, watering should be strictly controlled to enrich and lignify the seedlings and prepare for overwintering. If the weather is too dry, we can water it properly, and the trees should not wither.

? Third, fertilization.

In autumn, phosphorus and potassium fertilizer should be used mainly, and nitrogen fertilizer should be used with caution, because when nitrogen fertilizer is applied at this time, trees will grow white, the degree of lignification will be reduced, and they will be vulnerable to freezing or wind damage in winter. However, phosphorus and potassium fertilizer can supply the nutrients needed for the growth of trees in time, which is conducive to improving the lignification degree of trees and safely wintering.

Because autumn is the peak period of plant root growth, some phosphorus and potassium fertilizers can be applied to newly planted trees in spring to enhance the accumulation of trees and increase the concentration of cell fluid, thus enhancing the wintering ability of trees and laying a good foundation for their growth and development in the coming year. In addition, the application of organic fertilizer can improve soil porosity and loosen soil, which is beneficial to soil snow conservation, prevent soil drought in winter and spring, increase soil temperature and reduce rhizosphere freezing injury.