How to plant the latest seeds of Pinus elliottii?

White bark pine is a tree species endemic to China, also known as white bone pine, three-needle pine, white fruit pine, etc., which is light-loving, resistant to barren soil and relatively dry and cold climate, and grows well on calcareous soil and loess with warm and cool climate, deep soil layer, and rich calcareous soil and loess. Reproduction can be produced by sowing, cutting and grafting, but it is often used in actual production. Let's take a look at how to plant Pinus elliottii seeds.

Seed propagation of Pinus elliottii

The seeds of Pinus elliottii were stored in sand for 60 days or soaked in warm water to promote germination. High border sowing, the border surface can not accumulate water, after sowing can be covered with plastic film, in order to increase soil temperature and preserve soil moisture. It can be sprouted and unearthed in about 15-20 days. the film should be removed immediately after the seedlings are ready, and a layer of sawdust should be sprinkled between the rows to preserve moisture and prevent splashing mud to paste the seedlings during watering. The soil of the border should not be too wet to avoid sudden collapse. The height of the seedlings in that year is 5cm to 7cm, and the cold resistance is poor, so the seedlings in the north should be buried in the soil to prevent the cold. If there are conditions, it is best to set up a shade for a month after emergence to prevent sunburn. Because the mouse likes to eat pine nuts, it is necessary to sprinkle some rat poison on the border before building the arch shed to cover the film.

Transplanting seedlings of Pinus elliottii

The seedlings of Pinus elliottii grow slowly and should be planted densely. If we need to continue to cultivate large seedlings, we have to transplant 2 or 3 times before planting. The two-year-old seedlings can be transplanted with soil before the terminal buds germinated in early spring, with a row spacing of 20 to 60 cm without harming the terminal buds, watering twice after planting and watering again after 6 to 7 days. The seedlings of 4 to 5 years old can be transplanted for the second time with soil balls, and the row spacing is 60 to 120 cm. After survival, it is necessary to keep the soil around the roots loose, apply 100 to 120 kg of rotten organic fertilizer per plant, pour water through the soil after burying the soil, and then strengthen management, promote growth and cultivate strong seedlings.

Seedling Management of Pinus elliottii

1. Rational watering: Pinus bungeana seedlings gradually increase the ventilation time of the seedling bed after coming out, and their resistance is enhanced by refining seedlings, and the seedlings are more resistant to shade. After removing the film, the shade net should be covered immediately to prevent the harm of high temperature sunburn and blight. If there is no rain for a long time or high temperature in summer, it should be watered in time.

2. Grass loosening soil: White bark pine weeding should grasp the principles of removing early, small and clean, pulling weeds among plants by hand to prevent damage to seedlings, properly covering soil to prevent cracks after sowing seedlings and pulling weeds, the combination of strip sowing and loosening soil, seedling and seedling replenishment at the same time, and then timely drainage.

3. Timely fertilization: Pinus elliottii seedlings should be based on base fertilizer and supplemented by topdressing. During the peak growth period from the middle of May to the end of July, 2 to 3 times of topdressing was carried out, mainly nitrogen fertilizer, 3 piculs per mu of rotten human manure or pig manure per mu, about 20 piculs of water, 5 to 15 kilograms of rotten cake fertilizer per mu, and about 4 kilograms of urea per mu. Stop applying nitrogen fertilizer in the later stage of growth, increase phosphorus and potassium fertilizer to promote Lignification of seedlings, and spray leaves with 0.3% to 0.5% potassium dihydrogen phosphate solution.