How to plant seeds of Pinus elliottii?

White bark pine is a unique species in China, also known as white pine, three-needle pine, ginkgo pine, etc., like light, barren soil and dry and cold climate, in the cool climate, deep soil layer, rich calcareous soil and loess grow well, propagation can be used for seeding propagation, cutting propagation and grafting propagation, but in actual production commonly used seeding propagation, let's take a look at how to plant white bark pine seeds!

Seed propagation of Pinus bungeana

The seeds of Pinus bungeana were stored in sand for 60 days before sowing or soaked in warm water to promote germination. High ridge sowing, ridge surface can not accumulate water, after sowing can be covered with plastic film, in order to improve soil temperature and moisture conservation. About 15~20 days can germinate, seedlings should be removed immediately after the film, at the same time in the row spread a layer of sawdust, can preserve moisture and prevent splashing mud paste seedlings when watering. The soil should not be too wet to avoid damping-off. The seedlings are 5~7 cm high and have poor cold resistance. The seedlings in the north should be buried in the soil for cold protection. If there are conditions, it is best to put up shade for one month after emergence to prevent high temperature sunburn. Because mice love to eat pine nuts, before putting up the arch cover film, sprinkle some rat poison on the surface of the bed.

Transplantation of Pinus bungeana seedlings

White bark pine seedlings grow slowly, should be planted closely, if you need to continue to cultivate large-scale seedlings, but also after 2 to 3 times of transplanting before planting. Two-year-old seedlings can be transplanted with soil before the terminal buds sprout in early spring. The plant spacing is 20 to 60 cm. The terminal buds are not injured. After planting, water twice and water again after 6 to 7 days. 4 - 5 year old seedlings, can be transplanted with soil ball for the second time, plant spacing 60 - 120 cm. After survival, the soil around the roots should be kept loose, 100 to 120 kg of decomposed organic fertilizer should be applied to each plant, water should be poured after burying the soil, and then management should be strengthened to promote growth and cultivate strong seedlings.

Seedling Management of Pinus bungeana

1, reasonable watering: white pine seedlings out of Qi gradually increase the seedling bed ventilation time, through seedling training to enhance its resistance, seedlings more tolerant shade, remove the film should be immediately covered with shade net, to prevent high temperature sunburn and blight damage, long drought or high temperature in summer to timely watering.

2. Grass loosening: white bark pine weeding should master the principles of early removal, small removal and clean removal. Hand pulling should be used to prevent damage to seedlings. After sowing seedlings and pulling weeds, soil covering should be properly carried out to prevent cracks. Weeding and loosening of drilling seedlings should be combined. Thinning and replenishing seedlings should be carried out simultaneously, and then drainage should be carried out in time.

3, timely fertilization: white bark pine seedlings should be based on basal fertilizer, supplemented by topdressing. From the middle of May to the end of July, the growth peak period carries out 2 to 3 times of topdressing, mainly nitrogen fertilizer, 3 loads of decomposed human manure or pig manure per mu, about 20 loads of water, 5 to 15 kg of decomposed cake fertilizer per mu, about 4 kg of urea per mu. At the later stage of growth, nitrogen fertilizer should be stopped and phosphorus and potassium fertilizer should be added to promote seedling lignification. 0.3% to 0.5% potassium dihydrogen phosphate solution can also be sprayed on leaves.