a) Seedlings: Seedlings that are propagated with seeds. The seedlings cultivated with seeds by the artificial method are called sowing seedlings, and the seedlings which are naturally grown in the wild mother trees are called wild seedlings.
(2) Nutrient breeding seedlings: According to the seedling materials and specific methods used, they can be further divided into:
1. Cutting seedlings: seedlings bred by cuttings of seedlings or cutting branches of trees.
2, buried seedlings: with seedlings or seed strips, the whole strip is buried in the seedlings cultivated in nursery.
3, rooting seedlings: use the roots of trees or seedlings, insert or embed seedlings cultivated in the depression.
4, root seedlings: also known as the stubble seedlings, is the use of underground roots to erupt a new line of seedlings.
5. Grafted seedlings: Seedlings bred by grafting.
6. Layered seedlings: Seedlings that are not detached from the mother's body and buried in the soil, or wrapped in the air to be wetted, and then cut into the mother's body after rooting.
7. Tissue culture seedlings: Seedlings bred in nutrient solution using tissues or cells on the mother.
(3) Bed seedlings: Seedlings that continue to be cultivated in the nursery in the previous year.
(4) Transplanted seedlings: All kinds of seedlings mentioned above, where the seedlings are transplanted to another seedbed in the nursery to continue cultivation, the seedlings are called transplanted seedlings.
China's seedling market is still at an immature stage, and there are still many problems. The primary problem is that the information is not smooth and the producers do not understand the market demand. If producers blindly develop seedlings, it will inevitably lead to the shortage of seedlings in the market, and some varieties of seedlings are surplus. Therefore, it is recommended that all nursery workers in the seedling industry first go to the Miaomu supply and demand network to understand the supply and demand information and then develop in a targeted and planned manner. The producers should exchange information with the market and understand the demand trend of the city for seedlings. In the construction of urban gardens, in order to achieve the expected landscape effect as soon as possible, the constructors hope to use large-sized seedlings, requiring seedlings with a diameter of more than 10 cm, and some even requiring a breast diameter of 20 cm to 30 cm. Secretary-General Yang Xuezhi reminded the majority of seedling producers to pay attention to the cultivation of large-sized seedlings. She said that cultivating large seedlings can stop the big trees from entering the city from another side.
The second problem is the lack of uniform specifications and quality requirements for seedlings. Secretary-General Yang Xuezhi said that the requirements for seedlings in foreign countries are very strict, not only in terms of specifications, but also in terms of pests and diseases. The quality of domestic seedlings is uneven. In order to pursue unit production, some small nurseries are overly densely planted, so the seedlings produced are too weak to be used for landscaping. “Only pursuing quantity and not paying attention to quality†is a common problem in nursery.
The third problem is the lack of breeding farms and test sites in the country. There are very special breeding farms in foreign countries. These breeding bases are not only large in scale, but also cultivated many varieties, such as special breeding farms for flowers such as dahlia, gladiolus, tulip, and pansy. There is no shortage of planting bases in China and there is no breeding base.
There are also eucalyptus, eucalyptus, red arbor, purple leaf sakura, road greening, big leaf boxwood, Jiaodong wei spear, community greening, park greening, seedling greening, dragon claw æ§, fatong, national æ§, torch, sedum , Iris, Dianthus, big flower sedge, clove, forsythia, golden leaf privet, green seedlings and so on.
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