How to select white pine seeds? What are the breeding methods?

White bark pine, also known as white bone pine, flat dragon pine, is an evergreen tree, with obvious trunk, towering crown and green crown, which is of great ornamental value. At present, Pinus elliottii is often used for landscaping, mostly planted in parks, courtyards or streets, with good economic value, so it is welcomed by many growers. So how to select and raise seedlings of Pinus elliottii, as an endemic tree species in the north of China? Let's take a look.

How to choose the seed of white pine seed?

There are many different varieties of Pinus elliottii in the market, which can be divided into long hair, medium hair and short hair according to the length of pine needles, and their tree shape and growth rate are different, so it is necessary to compare them in many aspects when selecting varieties. In addition, white pine seeds are also divided into Gansu, Shanxi, Shaanxi Lantian or Baoji, of which they belong to. Gansu has good seeds, which are natural old trees in deep mountains, but the number is very small.

What are the methods of raising seedlings?

1. Seedling raising mode

The seedling of Pinus elliottii is mainly raised in the open field seedling bed, and the seedling is also sown in the plastic arch shed. The nursery should choose sandy loam and loam with flat terrain and good drainage, and do not choose to raise seedlings in places with low-lying terrain, poor drainage and easy accumulation of water in rainy season.

2. Seedling container

① foldable honeycomb bottomless plastic film container. The specification of the container is 5cm × 12cm, and the wall thickness of the container is 0. 02mm .

② plastic soft container. The specification is 8cm × 15~16cm, with 6 to 8 small holes at the bottom.

③ net bag container. The general specification is 5cm × 8cm. According to the specific situation, you can choose to place it in the tray or root control point plate.

3. Make beds and containers

The direction of the nursery bed should be north-south, and the drainage ditch should be dug around the nursery ground to ensure that there is no stagnant water inside and no flooding outside. Generally, the seedling is raised in a low bed, and the depth and width of the bed are determined according to the specifications of the container.

When the foldable honeycomb plastic film container is filled with soil, it needs to be pulled apart and arranged horizontally in the nursery bed, and its opening length is just 80 cm, which is equal to the width of the nursery bed, so that each container is hexagonal and then fixed.

Soft plastic containers should be filled with nutritious soil and should be placed neatly in the bed after loading. After the container is arranged, it should be flat and slightly above or level with the ground to facilitate drainage.

4. Seed treatment and sowing

Before sowing, soak the seeds with 0.5% potassium permanganate solution for 20 minutes for disinfection, then wash them with clean water, then soak the seeds in warm water of 40 degrees Celsius for 48 hours, remove them slightly coolly, and then accelerate germination. The seeds can be sowed when the seeds are white. The sowing time varies in different places, and the best sowing time is within 10 days after soil thawing in spring. Sowing depth of 1 cm is appropriate, do not be too deep. After covering the soil, it is slightly suppressed, so that the seeds are in close contact with the nutritious soil, and finally cover branches, straw and other things to keep the seedbed moist.

5. Seedling stage management

After half a month of seedling emergence, the seedlings should be divided into several times, and the final bag should be 1 plant; sunburn should be prevented from emergence to the early growth stage to ensure the water needed in the seedling growth period (one-year-old seedlings generally do not apply fertilizer); before emergence, the commercial amount of 24% ethoxyfluoxane EC per mu is 5080 ml, mixed with water 30 kg, spray for soil treatment, which can effectively control annual monocotyledon and dicotyledonous weeds and is safe for seedling emergence.

Pinus bungeana has deep roots and tolerance to barren soil, and grows well in deep and fertile calcareous soil or loess. In the process of seed selection and seedling management, Pinus bungeana must be treated correctly according to the habits of each stage of Pinus bungeana. Generally, the cones will mature from October to November of the second year.

With regard to the wonderful pictures and articles and popular comments on seed selection and seedling cultivation of Pinus elliottii, you may be interested in the following recommended contents of Nongxun. Welcome to read.

Agricultural products you may be interested in: national supply of high-quality white pine seeds