1. Roots are the roots of trees, especially old trees. Root groups are generally widely distributed and not concentrated. Therefore, when applying fertilizer, we should pay attention to the area around the root of beard, not too close to the trunk, so as to fully absorb nutrients and water. ?

2. Deep fertilization should be applied to the annual trees with well-developed roots and far distribution, such as Ginkgo biloba, Toona sinensis, Albizia Albizia and Pinus tabulaeformis; For some trees with shallow roots, such as paulownia, shrubs, Amorpha fruticosa, etc. Or newly transplanted trees, the fertilization should be shallow and the scope should be small. ?

3. Never use raw manure as the applied organic fertilizer, ensure full fermentation and decomposition, and dilute the concentration. In addition, because the temperature is too low in winter, the fertilizer must be powdery, not blocky, otherwise it will be difficult to absorb. It is best to apply commercial organic fertilizer, which will not burn the seedlings after complete decomposition, and can meet the nutrients needed by the seedling growth period, so that the leaves are dark green, the roots are developed and the seedlings grow healthily. Can reduce the occurrence of soil-borne diseases and insect pests.

4, after fertilization, must be timely and appropriate irrigation, make the fertilizer into the soil. Otherwise, the temperature in winter is too low, and the fertilizer is difficult to melt and absorb, and it cannot play its due role.

Extended data:

principle

1. scientific management and maintenance: establish a set of computer software for landscaping management system. Its contents include: greening archives, data collection, analysis and charts, that is, combining multimedia technology to realize dynamic browsing, mechanized maintenance and scientific management. Water and fertilizer management is the core of tree management, which should be watered thoroughly at one time.

2. Pay attention to shaping, pruning and weeding. Cutting adult trees to a certain height can stimulate the hidden buds in the hidden epidermis to germinate, form young branches and restore vitality. Weeds can be controlled by artificial weeding and spraying herbicides.

3. Take the principle of "prevention first, comprehensive prevention and control". Comprehensive control measures include plant quarantine, biological control, cultivation measures and chemical control. As mentioned above, the choice of tree species should be matched with each other to avoid planting two adjacent parasitic trees. If apples, pears, etc. Conifers and cypresses are planted, which are prone to rust. Street trees should also be changed at intervals to isolate diseases.