What are the main contents of garden tree maintenance management?

1, fertilizer and water management \x0d\ Tree height, developed roots and wide roots. When planting, a square hole of 0.8- 1.0 cubic meter should be opened and filled with fertile exotic soil 30 cm higher than the flat land before planting. In terms of fertilization, compound fertilizer is the main fertilizer, and the ratio of nitrogen, phosphorus and potassium in 1-3 young trees is 5: 3: 2. Trees older than three years are 3:2: 1. Fertilization frequency: within three years after planting, apply the compound fertilizer once a year at the beginning of spring, summer and autumn, each time1-2kg, with fewer young trees and more big trees. Fertilization method is: young trees combine with loose soil to apply liquid fertilizer, and big trees apply dry fertilizer in crown width. In principle, no fertilizer can be applied to tall trees for more than three years. Shrub species are small, mainly planted in shallow holes or ditches, with shallow roots. According to the soil and tree potential, proper application of compound fertilizer, liquid application combined with dry application, appropriate application of P and K fertilizers for flowering and fruit-watching shrubs, and appropriate application of N fertilizers for foliage shrubs. The water management of greening trees is mainly based on young trees, and the principle is to keep moisture and not pollute, and the topsoil is dry but not white. Tall trees, with deep roots and luxuriant leaves, will not affect their growth because of lack of water. Shrubs are short and their roots are short. Potted plants must be drought-resistant, moist and waterlogged to grow normally. \x0d\ 2。 Tree management \x0d\ Greening trees, through artistic design and careful management, is one of the keys to the success of greening. Trees require the trunk to be straight, and don't pull out the fixed anchor rod when planting prematurely, so as not to cause the trunk to bend. Adult trees should cut off irregular branches in time, and do not cut off windproof branches with large crown and small leaves. In case of heavy wind and rain, branches will be broken and uprooted, causing losses. Shrubs are required to be neat, tangible and orderly, and the tree shape is formed by continuous growth of trees and manual pruning, which can be pruned into spheres, squares, sectors, mushrooms, abstract patterns, lines, column piles and vertebral piles. You can even weave figures with iron wire or "double dragons playing with pearls", "lions rolling balls" and "complacent" to let the branches and leaves of shrubs grow in them and trim them by weaving. Regardless of trees and shrubs, dead leaves should be removed in time. For stem-watching trees such as Dawangye and Areca catechu, it is necessary to ensure that the trunk is straight and clean, the leaf sheath is large, and it is not easy to fall off naturally after drying up. Need to be removed manually in time. \x0d\ 3。 Prevention and control of tree pests \x0d\ The main pests of greening trees are longicorn beetle, psyllid, leaf miner, leaf miner, scale insect, scarab, etc. In recent years, the damage of psyllid on trees and shrubs is more serious, followed by scale insects. Conventional insecticides, rapid culling and Jieteling can all achieve the control effect. The main diseases are root rot, powdery mildew and anthracnose. Commonly used prevention and treatment drugs are thiophanate-methyl, carbendazim, anthrax and so on. The common concentration is 800- 1000 times. In addition to drug control, litter should be cleaned up frequently during cultivation to keep it clean, and at the same time, waterlogging should be removed after pruning if necessary.