What month was Pinus elliottii planted?

Planting technology of slash pine slash pine (commonly known as American pine and foreign pine) is native to the southeastern United States. Scientific name: slash pine. It is a fast-growing forest tree species. Strong adaptability, fast growth, low temperature resistance and poor ridge resistance. The tree is neat, the trunk is tall and straight, and the side branches are neat and uncomplicated. Tip length15-20cm, 3 tips and 2 tips coexist, and the color is green. The preferred tree species for landscape trees, expressway and railway greening. At the same time, it can be used for afforestation, and 10- 12 can be used every year. Turpentine oil has a large output and high economic value.

I. Use and value:

1. Wood value: Pinus elliottii has fast growth, good wood, high rosin output and good economic benefits. Wood is widely used in buildings, sleepers, pits, plywood, fiberboard and papermaking. Wood value is 700 per cubic meter-900 yuan.

2. Ornamental value: Pinus elliottii grows vigorously, with fast growth speed, neat tree shape, straight trunk and neat lateral branches. China has been domesticated successfully for several decades, and has been widely used in gardens in the south of the Yangtze River, natural scenic spots, expressway and both sides of the railway. When planting alone or in groups in the garden, select 3-4-year-old seedlings and transplant them with soil in rainy spring; In order to ensure the survival rate, it is best to use bagged seedlings or nutrition pot seedlings, and the survival rate can reach more than 98%.

Second, the suitable environment:

The main characteristics of Pinus elliottii are: strong adaptability to temperature and soil, relative tolerance to wetland; Low temperature resistance, poor ridge resistance, neat tree shape, straight main stem, neat and uncomplicated side branches.

The optimum environmental conditions for the growth of Pinus elliottii are: rainfall 1000- 1400mm, annual average temperature 15.4 ~ 2 1.8℃, absolute maximum temperature 38℃, even 4 1℃, absolute minimum temperature- It can be planted in the Yangtze River basin and southern areas. Pinus elliottii grows well in red soil hilly land and sandy clay land eroded by neutral strong acidic soil with poor drainage of iron nodule layer under 50 ~ 60 cm topsoil. Pinus elliottii is also relatively drought-tolerant, and can flourish in arid and barren low mountains. It grows poorly in well-drained sandy land or waterlogged land. Pinus elliottii is a light-loving tree species, which is extremely resistant to shade and has strong wind resistance. The root system has mycorrhiza, which is innate.

Third, the seedling raising method:

Sowing: Sow in the nursery. Sowing season, from June to April in the south; Shading measures should be taken for sowing after May. In Jiangsu, Zhejiang, Suzhou and Hangzhou, the sowing time is relatively delayed.

Seed treatment: firstly, pour the seeds into clear water, add a proper amount of household detergent of White Cat, rub off the wax on the surface of the seeds by hand, then rinse them with clear water, then pour them into warm water of 50 degrees, soak them for 24 hours, pick them up, filter them out, put them into a cloth bag, rinse them once a day in the morning and evening, and hang the bag after washing to prevent the seeds from soaking in water. Repeat this process for 5-7 days and find that some seeds are about to germinate. Pour the seeds out of the bag, dry the water on the surface and start sowing. If sowing is used, cover the soil by 0.3 cm, water and moisturize, and germinate in about 5-6 days. After the seedlings grow, fungicides such as carbendazim and thiophanate should be sprayed to prevent "damping off". Sometimes "Bordeaux mixture" spray is also used.

Note: Take the medicine once a week within one month after the appearance; Every time it rains, spray it in time after the rain.

Seedling management: weeding in time, keeping the soil moist and using dilute liquid fertilizer. After the seedlings grow for 4 ~ 5 months, the roots (underground main roots) should be cut off in time if possible, so as to have a better survival rate when transplanted (without roots) in the future. Pinus elliottii is extremely resistant to shading, so it is not necessary to shade the whole seedling stage except for short-term shading when transplanting seedlings. The average height of annual seedlings is about 30 cm, and the ground diameter is about 0.4-0.7 cm. From the end of the year to February in the solar calendar (that is, around the Spring Festival), afforestation in the mountains is the best season.

Four, afforestation points:

1. Selection of afforestation site: it is advisable to choose low hills or the middle and lower parts of low mountains, with a slope below 30 degrees, a leeward and sunny, and a deep and fertile soil layer.

2. Land preparation methods: mainly block land preparation and strip land preparation. If block soil preparation is adopted, the specification is about 50×50×30cm.

3. Planting technology: cultivate short-period industrial timber forest with plant spacing of 1.5× 2m or 1.5× 1.5m, that is, 222 or 296 plants per mu, and cultivate general timber forest with plant spacing of 2.5× 2.5m or 2× 2.5m, that is, per mu/kloc. Cultivate mother trees or seed orchards with row spacing of 4× 4m or 5× 5m, that is, 42 or 27 plants per mu.

The afforestation season is mostly in winter and spring. Choose cloudy or rainy weather in Mao Mao for planting. It is required to plant with seedlings. When planting, the roots should be properly cut off, and the root length is about 15cm. Can be deeply planted, seedlings should be well rooted, layered and filled, and covered with fine soil in an arc shape.

Verb (abbreviation for verb) tending management:

Weed and loosen the soil 1 2 times a year after afforestation; The second year depends.

Thinning is generally 8 ~ 10 years old, and the number of thinning plants is about 25% of the number of preserved plants. Then thinning 1 ~ 2 times, the intensity is 20 ~ 30%, depending on the growth status and cultivation objectives of the stand. 4-5 years apart.