Wei Zishu in Baoding, Hebei Province

First, pay attention to the regionality of Miao source.

The influence of climate on plants is obvious, such as French phoenix tree, magnolia and crape myrtle, which grow well in Baoding and Langfang on the border of Hebei Province, but can't survive the winter in Zhangjiakou. Like weeping willows, the survival rate of seedlings purchased from Baoding is not as high as that purchased from Zhangjiakou nursery. ...

Therefore, the seedling source is usually selected from the local nursery. If there is no suitable seedling source in the local nursery, it should be selected from the adjacent urban nurseries with similar climatic conditions to improve the survival rate of seedlings.

Second, reject seedlings with pests and diseases.

Before the trees germinate, many diseases and insect pests of seedlings are difficult to be found at this time, and the germs and eggs lurking in the trees are not easy to be found. If the buyer is not deeply involved, he may be fooled.

If you are an experienced buyer, you will choose several seedlings from different directions and positions in the woodland to check the pests and diseases, and check and identify their trunks, fallen leaves on the ground and newly waiting parts.

■ Observe whether there are wormholes on the trunk, insect dung and sawdust under the bark, and disease spots caused by bacterial infection (such as bark rot and canker of poplar, willow and other trees).

■ Observe the fallen leaves on the ground to see if there are any marks such as bite marks, perforations and diseased spots. As long as you observe carefully, you can also observe these symptoms on fallen leaves.

■ Then there is the observation of branchlets. Many diseases have symptoms on branchlets, such as diseased spots, dead branches and picking branches. Generally, through the combination of these three aspects, problems can be found.

Third, understand the transplanting situation of seedlings.

Usually, the nursery uses seed sowing to raise seedlings, and the seedlings are transplanted 2-3 times before leaving the nursery to promote fibrous roots and improve the survival rate of tree transplantation. However, some nurseries do not transplant in order to save manpower and material resources, and the survival rate of these seedlings after planting will be greatly reduced. Senior buyers will randomly select 2-3 alternative seedlings when selecting seedlings, dig up the soil on one side of the seedlings with a digging tool until the root system is exposed, and identify them by looking at the growth of main roots, lateral roots and fibrous roots.

Fourthly, determine the planting time of the source of seedlings.

Generally speaking, the commercial seedlings with DBH at 8- 15 cm are the most commonly used seedlings in greening projects, and some nurseries buy seedlings of this specification from other places at low prices in order to make huge profits, cut them down and sell them at high prices 1 year. The survival rate of these seedlings is naturally not very good, because they lack the nutrients accumulated by trees after planting, and their roots have not fully recovered after being injured. Senior buyers will personally go to the site to observe carefully and ask about the planting situation of Miaoyuan.

With the full crown planting trees being more and more respected by the market, some nurseries cut off all the seedlings planted for many years and re-cultivate the crown width. 1-2 years later, the crown width reached 1.2 meters, which just met the specifications of the full crown sale. These two situations need to be distinguished.

In addition, due to the hot market of some large evergreen trees in recent years, many nurseries hire workers to dig wild mountain seedlings, such as Pinus tabulaeformis and Picea, from mountains or naturally growing woodlands, and then store them in nurseries for maintenance and sale. Because this kind of seedlings have just been transplanted, the physiological functions of the trees have not been fully restored, and the nutrient accumulation is not sufficient. If transplanted again, the survival rate is relatively low. However, there is no obvious difference between this kind of seedling and nursery seedlings planted for many years, and it is easy to buy this kind of seedling when buying.

Senior buyers will distinguish such seedlings through the following three points: ↓↓↓

■ The first point is to look at support. After planting large-area seedlings of evergreen trees, it is generally necessary to support them in the same year and pull them out in one to two years. If the support of the seedlings to be purchased is still there, it means that they will not be bought after less than three years of planting.

■ The second point is to look at the clay ball. Generally, the soil balls planted with evergreen trees should be buried shallowly, and the upper surface of the original soil balls is exposed. If the straw rope and grass chips packed with soil balls are still well preserved and not rotted, it means that the planting time is short, less than three years.

■ The third is to look at the fullness of trees and the growth of branches and leaves. Due to the poor site conditions, the number of branches of mountain seedlings is small and the leaves are thin, so the overall crown does not look full. V. Distinguishing soil types

The type of soil is mainly related to the survival of transplanted trees with soil balls. Under normal circumstances, trees with crown and evergreen trees should be planted with soil balls, and the quality of soil balls directly affects the survival rate of trees. If the soil is sandy, it is difficult to bring soil balls when digging seedlings. Even if the soil ball rotates well when digging seedlings, it will be scattered all over the floor if it bumps slightly during transportation.

When purchasing seedlings with soil balls, experienced buyers will dig out the soil under the tree with a shovel to check the soil quality and identify the soil with their eyes and hands. This is often overlooked by shallow buyers, but it is very important for the survival of trees.