How to select Fraxinus mandshurica seeds? What are the methods of raising seedlings?

Shuiqu willow is a gradually endangered tree species of Oleaceae, and it is also an ancient residual plant. Although the distribution area is wide, most of them are scattered. With tough material and beautiful texture, it is a good material for furniture. Due to excessive felling, the number is decreasing day by day, and there are few big trees at present. So how to choose Fraxinus mandshurica seeds? What are the methods of raising seedlings? Next, let's have a look with the editor.

How to select the seeds of Fraxinus mandshurica?

In the seedling stage of Fraxinus mandshurica, seed selection is particularly important, and the quality of seeds directly affects the growth of Fraxinus mandshurica. It is best to select the seeds collected from the fine stand of Fraxinus mandshurica in this area, and also to select the fine seeds of Fraxinus mandshurica produced in the same or similar areas of ecological climate and soil conditions in this area.

For this reason, Fraxinus mandshurica grows into the fruiting stage every year, and the mature seeds are collected and arranged. After entering July, observe the color of Samara, select yellowish mature fruit to collect and sow, in the coming spring when the earth warms up, Fraxinus mandshurica seeds germinate in the land. It should be noted that the seed collection of Fraxinus mandshurica should not be too late, because the seed entering the dormant period is not conducive to germination in the second year.

What are the breeding methods of Fraxinus mandshurica?

1. Seed germination

The seeds are mixed with clean fine river sand (humidity required to be 60% of saturated water content) according to the ratio of 1 ∶ 3, spread out in a well-ventilated place with a thickness of about 30cm, and treated for 90 days under the condition of 25 ℃, which should be turned and checked frequently to prevent mildew, and pay attention to moisturizing at the same time, and then be treated at 0: 5 ℃ for 60 days. Sprouting before sowing, that is, about 7 days before sowing in late April of the following spring, the seeds treated with variable temperature and sand will be transferred (tiled) to a flat and leeward place with a temperature of 18: 25 ℃, and the thickness 30~40cm should be spread. Frequent turning and careful inspection are required. When the rate of seed crack reaches 30%, the seeds can be sown.

2. Sowing and raising seedlings

The way of sowing is often adopted. Before sowing, the nursery bed is filled with sufficient bottom water, and after 1-2 days, the topsoil is slightly dry and sowed, and the seeds of mixed sand are sowed evenly on the bed surface in breeze or windless weather. After sowing, the soil thickness is about 2.0cm, and the thickness is uniform. Finally, compaction is carried out. Then 25% herbicide wettable powder was mixed with water to form a 1% concentration solution, which was evenly sprayed on the bed surface according to the dosage of 0.5~1.0g/m2, and closed grass control treatment was carried out on the bed surface.

3. Seedling stage management

When the bed temperature reaches or exceeds 30 ℃, watering and cooling measures will be implemented immediately. When the surface soil of the seedling bed is dry, it is necessary to spray an appropriate amount of water, and the principle of spraying water is a small number of times, with no stagnant water on the bed surface as the degree. When the seedling buds break out of the soil, the amount of water can be increased moderately, and attention should be paid to breaking the plate layer in time. Prevent frost in the morning and evening. Atomization water spraying or fumigation can be adopted to prevent the possible harm of frost in the morning and evening.

4. Interseedling and supplementary seedling

The seedlings can be carried out before and after 20 days, and the seedlings can be planted every 10 days. At the end of June, the seedlings remain in the seedling bed according to the density of 600.70 plants / m2. Before fixing the seedlings, small shovels or seedling transplanters should be used to replant the missing seedlings. When diseases and insect pests are found in the seedling stage, targeted measures should be taken in time to control them.

The above is the introduction of Fraxinus mandshurica. Fraxinus mandshurica is a valuable timber tree species in Northeast and North China, which can make all kinds of furniture, musical instruments, sports instruments, cars and boats, machinery and special building materials. At the same time, it is of scientific significance for the study of Tertiary flora and Quaternary glacial climate.

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