(2) All seedlings should be covered with soil balls, and the diameter of soil balls is 10 ~ 12 times that of DBH, which is15 ~ 20cm larger than that of normal season, so more roots are reserved for trees, which is beneficial to slow down seedlings. (3) When raising seedlings, if the soil is too dry, sufficient water should be poured 3-5 days before raising seedlings. Prune the root system immediately after emergence and spray rooting powder, such as 100ppm ABT3 or 30ppm ABT6. The soil ball should be packed with wet grass pieces or wet grass ropes, which should be firm and not easily broken, and the back should be sealed.
Second, pruning before planting. Before planting, the pruning amount should be increased to reduce the leaf respiration and transpiration of plants. Through pruning, we can adjust the tree potential, improve the tree shape, prevent or reduce the occurrence of pests and diseases, and improve the survival rate of seedlings and landscape effect.
1. Pruning of evergreen conifers
(1) The pruning amount of evergreen coniferous trees should not exceed 20% of the leaf amount, and the big branches over 2 cm should not be sparse or less sparse as far as possible, and protective agents should be applied at the cut to prevent the trees from weakening or dying due to gumming.
(2) Cedar, Pinus armandii, Pinus tabulaeformis and Pinus bungeana. It should be a small wallet with 1 to 2 cm.
(3) Prune trees according to their growth habits. Cedar, for example, is a tree with a main shaft, and its top is extremely beneficial. The natural tree is a steeple, so be sure to protect the top when pruning. Arrange the main branches reasonably, and there should not be too many main branches. There should be a certain interval between the main branches of each layer, and cut off the too dense branches that affect stratification.
(4) Sabina vulgaris (such as Sabina vulgaris, Sabina vulgaris, etc. ) strong germination, and its pruning can be carried out according to the modeling requirements.
2. Pruning of evergreen broad-leaved trees
(1) is mainly used for thinning dense branches in lumen, mainly thinning leaves, and the amount of thinning leaves can be 1/3 ~ 1/2 of the amount of leaves. Keep the petiole as much as possible, and apply protective agent on the incision.
(2) For evergreen broad-leaved trees (such as Magnolia grandiflora) with weak regeneration ability, only branches can be thinned, leaves picked and buds smeared properly, and short cutting and equal weight pruning cannot be carried out. The key point of pruning is to remove long branches, cross branches, drooping branches, dead branches, pests and diseases branches and over-dense branches, and keep the original tree shape as much as possible.
3. Pruning of deciduous trees
(1) General tree species: cut off diseased branches, dead branches, excessively long branches, crossed branches, combined branches, damaged branches, excessively drooping branches, redundant branches on the trunk, long branches that affect the crown order, and sprouting branches on grafted rootstocks.
(2) Under the premise of ensuring good ornamental effect and loosening peripheral branches, the pruning amount of branches can be controlled at 40% ~ 50%, and some leaves can be loosened at the same time. The thinning amount of leaves depends on the size of crown and soil ball, the integrity of soil ball, the density of branches and leaves, and the transplanting period, which can generally reach 1/3 ~ 1/2 of the leaf amount.
(3) Tree species (such as Liriodendron chinense, Magnolia grandiflora, cherry blossoms, etc.). ) callus with poor induction and weak branching ability should not be re-cut, and buds should be used to pick leaves. Branches that are too dense can be properly thinned, and protective agents such as Guo Fukang should be applied at the cut.
(4) bleeding trees (such as Acer truncatum, Juglans mandshurica, Acer truncatum, etc.). ) Generally, it is not pruned before germination, but after germination and before leaf spreading, and some leaves should be removed.
4. Pruning of trees (such as begonia star anise, cherry blossom, pomegranate, etc.). ) buds have appeared and are blooming.
Buds should be picked or thinned in time to avoid flowering in the same year or reduce the amount of flowering, so as to restore growth potential as soon as possible.
5. Pruning lonely trees
To maintain its natural tree shape, if the surrounding area of the tree is very open and large, the branches can be opened as much as possible to maximize the crown without affecting the coordination with the surrounding environment.
6. Pruning of planted trees
The branching points of peripheral trees should be low, and the lower branches should be kept properly when pruning. The branching point of the inner tree should be slightly higher than that of the outer tree, and the inner and outer layers should be reasonably matched; The crown shape of peripheral trees should be full, and pruning should be based on thinning branches, with appropriate short cutting. The crown shapes of inner trees and outer trees should complement each other, which can be done by cutting short or thinning branches.
7. Pruning of trees in special scenic spots
Pruning should be carried out according to the requirements of special shapes, such as flat-topped Pinus tabulaeformis planted at the corner of the path or beside the rockery. When pruning, the upright branches, drooping branches and redundant branches that affect the crown effect should be cut off.
8. Pruning shrubs and vines
(1) Bare-rooted seedlings with soil balls or in wet areas and flowering shrubs with differentiated flower buds in the previous year should not be pruned, and dead branches and branches with diseases and insect pests should be cut off.
(2) For grafted shrubs, the sprouting branches of the rootstock below the joint should be cut off.
(3) Shrubbery with obvious branches and new branches with flower buds should be strongly pruned according to the tree potential to promote the growth of new branches and the regeneration of old branches.
9. Root cutting
Trim exposed big roots, cracked roots and broken roots, and the incision should be smooth and stubble-free. Spray 30ppm ABT6 rooting powder on the roots and spray all exposed roots.
10. Finishing quality
The incision should be smooth and not split. When the branches are cut short, leave outer buds. The incision must be located 0.5 cm above the bud position and the diameter should be trimmed.
The above is Bian Xiao's answer, for reference only!