First, exit standard
Seedlings out of the nursery standard: seedlings branches robust, good maturity, buds full; roots sound, fibrous roots; no pests and diseases. At the same time, seedling height should meet certain requirements. For example, the diameter of seedlings such as Populus tomentosa, fast-growing poplar and Farnnon should be more than 3 cm, and the height of seedlings should be more than 3.5 meters; apple, pear, apricot, peach and other seedlings should be more than 1 meter high.
Second, grasp the lifting time
In principle, seedlings should be planted during the dormancy period. Deciduous tree species can raise seedlings from the beginning of the autumn deciduous season to the sap flow in the spring of the following year. In addition to the above time, evergreen tree species can also be raised in the rainy season. It is better to start the seedlings in the springtime. It is necessary to raise the seedlings before the seedlings begin to sprout. If the seedlings are raised after the shoots are opened, the survival rate of the seedlings will be reduced.
Third, master the garden method
When lifting the seedlings, rooting should be avoided as much as possible. Dig far and far, and the length of the main seedlings and lateral roots of the seedlings should be at least 20 cm. Do not injure the seedlings' cortex and shoots. Because of winter and spring drought, the nursery soil is easy to compact, and it is difficult to raise seedlings. It is best to water the nursery area 4 days before the seedling raising, so that the nursery stock can suck enough fertilizer and water in the nursery, have sufficient nutrient reserves, ensure the integrity of the seedling root system, and enhance the ability of the seedlings to resist drought.
4. When digging seedlings with earthballs, the diameter of the earth ball carried by the root should be 6-12 times the diameter of the seedlings. Precious trees or trees can be wrapped with straw ropes to prevent scattering. After planting seedlings, the roots and the soil should be closely connected.
Five, seedling disinfection
The first is the sterilization method, which can be immersed in seedlings with 3-5 Baume degrees for P3-23 minutes, or with a 1:2:100 Bordeaux mixture for 10-20 minutes. The second is insecticidal disinfection. Use 50% methyl 1605 EC 500 times solution for 20 minutes.
Six, do a good job rating
In order to ensure the balance of the forest and the growth potential of the seedlings after planting, immediately after the emergence of the seedlings, the leeward areas should be graded and the names of the varieties should be marked to prevent confusion. Seedling classification principles: pure varieties, the same type of rootstock, branches full, bud full, with a certain height and thickness, developed roots, more roots, less root cut, no serious diseases and insect pests and mechanical damage. Coniferous species also need to consider the development of the top bud.
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