I. Main ways in which tree seedlings are grown
1. Cultivation of seedlings from the original to the other, to be bred into tree seedlings at greater range。
2. Remanding nurseries. Multiple displacements of nursery trees, leaving them in the form of the required specifications。
Cultivate small seedlings at small and large distances, grow suitable crops between rows, and cultivate small seedlings into tree seedlings by farming them。
4. Combination cultivation. Saplings of greened trees (e. G., curds, e. G., e. G., e. G., saplings) and saplings of saplings (e. G., sprouts, pines, etc.) are mixed for afforestation and can be exploited when needed。
Speculative forest cultivation the first two types of seedlings, which are suitable for precious species such as cedars, dragons, ginsongs and southern sprouts, have a high degree of transplantation and are normally transplanted twice, while the last three types of seedlings, which are suitable for general species, have a relatively low displacement density and usually require only one transplant。
Ii. Transfer technology for the transfer of shoots
1. The number of years of growth depends on the growth rate of the target and tree species, which is usually 1 to 3 years and 2 to 6 years。
2. Transplantation during the transplantation season。
3. The nursery shall be used for the transfer of the nursery and the nursery, and shall be used for the production of high-yielding forest land and for the deep tillage of the earth and the application of base fattening to make high-beds; and for the silt and co-breeding of the forest shall be for the selection of type i forest land, for the thorough cultivation of the large dens and for the proper application of base fattening。
4. Refurbishment of small saplings. Choose a well-growing sapling, keep its roots intact as far as possible, and cut through the thick branches and the long roots. The tree seedlings of the permafrost should be cut off from the branches and parts of the leaves in order to reduce the evaporation of water and to promote survival。
5. Port density. Port density depends on tree species and culture specifications, with a common line spacing of 12, 60, 100 cm and a range of 10, 50, 100 cm。
6. The transplantation method is more intensive, i. E., by digging small caves in seedbeds or large caves at a predetermined range. It is necessary to be well-positioned, rooted, stretching, deep and moderate, and watered. Trees such as boulders and pyrotechnics can be cut off from dry planting. Trees need to be planted on a run-off scale to facilitate management, to be matched by the use of live forest trees for root powder and to provide better incentives for rooting。
Iii. Management of tree seedlings
1. Weed cultivation in china 5-6 times in the first year, 4 times in the second year, 3 times in the third year and 1-2 times per year from the fourth year; the depth of weed cultivation in china is 15 cm。
The main stem requirements for seedlings are: 3-4 m green seedlings for walk trees and settlements; 1-2 m seedlings for protected forests; and green seedlings for surroundings and gardens, as required. The branches and pretenses on the backbone are cut and canopy canopy is trimmed as necessary. The top bud is removed when the backbone height meets the standard。
3. Fertilizer management. The rainy season must eliminate water accumulation and be irrigated in a timely manner in times of drought。
Pest control. Root-eating insects can be treated in the earth with furan granules or baited with bait; leaf-eating pests can spray pesticides such as xeroxes and trichlorfon; invasive diseases should be sterilized in soil before transplantation, protected by sprayed bordeaux and treated with the application of fungicides such as dyson zinc and dikeson。
The five- to six-year-old seedlings must be treated with one to two years in advance to promote their growth, thereby increasing the rate of growth. The root, which is usually taken in the spring or autumn, shall be cut off from the root of the tree, which is five times its base length, and which is twice the depth of the tree's base diameter and one to two times the width of the base, and which may be excavated into squares or circles and then refilled with pine soil。
The tree seedlings shall be grown in accordance with the principles of excavation, assembly, transport and planting. Earthballs are usually brought, and they are covered with grassline. If bare seedlings are dug, the roots must be covered with mud and covered with wet grass。
