First, the selection of excellent varieties of saplings should be pure and adapt to local natural environmental conditions. To develop new varieties of fruit trees, it is necessary to consult relevant scientific research departments and experts, and never trust advertisements and choose seeds by ear. The seedlings supplied by general scientific research units and competent departments are more reliable. For seedlings sold by individuals, the source of seedlings or scions must be made clear before purchase.
Second, the root system of fruit tree seedlings with excellent roots should have more lateral roots and fibrous roots, which are evenly distributed. The first-class and second-class seedlings should have more than three lateral roots, and the roots should not lose water.
3. Selection of superior specifications: The height of fruit seedlings should be 1 ~ 1.3 m, and the ground diameter (above the interface 10 cm) should be 0.8 ~ 1 cm. Grape Miao Di diameter is not less than 0.6 cm.
4. Germination conditions: the plastic belt below the fixed stem position must have more than 6 full and full leaf buds, so that good branches can be issued after the fixed stem position. Grape seedlings must have 3 ~ 4 full buds with high maturity.
Five, whether there are pests and diseases, choose the seedlings without pests and diseases, and the seedlings belonging to the quarantine scope should have quarantine certificates. Never introduce diseases, insects and weeds into quarantine objects, otherwise there will be endless troubles.
Sixth, whether there is mechanical damage, choose seedlings without mechanical damage, especially the phenomenon of broken roots and joints.
Seven. The maturity of mature seedlings should be high, with the skin color and leaf color of the variety, less fluff on the branches and no tender leaves in autumn to improve the cold resistance.
Eight, moisturizing status Choose saplings with fresh roots, no wrinkled skin and no dryness, especially saplings preserved by spraying salt water, so as not to reduce the survival rate.
Nine, grafting rootstocks All kinds of fruit trees have certain rootstock requirements. For example, the rootstock of wide-peel citrus is bitter orange, the rootstock of navel orange is sour orange, fragrant orange, little red orange and earthy lemon, the rootstock of pomelo is sour pomelo, the rootstock of pear is Li Tang and Li Dou, the rootstock of peach and plum is peach and mountain peach, and the rootstock of loquat and bayberry is seedling. Rootstock affinity is not suitable and not strong, which hinders the development of seedlings.
Harvest method: scrape the topsoil, take out the bacteria and fillers in the upper soil, then take out the rhizome of Gastrodia elata, and harvest i