Sowing and Cuttage Propagation of Populus tomentosa

Populus tomentosa is an evergreen shrub or small tree. It is a good street tree and can be cultivated at home as a bonsai. Some players will want to breed their own boxwood to a certain extent, but they don't know how to breed. The editor will introduce to you the methods of sowing and cutting propagation of boxwood. Interested friends can learn about it together.

Yellow poplar

First, sowing and reproduction

Sowing should be in July to harvest ripe fruit, spread out and dry, threshing and seed collection, bag storage. If sowing in winter or early spring, if sowing later than March, few seedlings will emerge in that year, and most of them will not germinate until the next year. Before sowing, soak the seeds in 40 ℃ warm water for one day and night (natural cooling) to dry, then sow the seeds. The seedbed soil should choose fertile and loose sandy loam, the row spacing of strip sowing is 1520 cm, the sowing width is 5 cm, the depth of sowing ditch is 2 cm, the thickness of coke mud is 1 cm after sowing, and then cover straw. After the seedlings are unearthed, uncover the grass in time and build a shed for shade. At the seedling stage, we should strengthen management, weed and loosen the soil, water frequently, keep the soil moist, and apply thin pancake fertilizer and water. Remove the shade shed in September, leave the bed for a year and then plant it separately.

2. Cutting propagation

It is appropriate to carry out in the plum rain season, select semi-lignified strong branches as cuttings, length 10-12 cm, base with heel, upper leaves 5-6 pairs, deep 1B2~2B3, plant row spacing 6 × 10 cm, solid soil after insertion, watering thoroughly, building shade, often spraying water to keep the soil moist, especially in summer. Remove the shade shed from September to October, leave the bed for a year and then plant it separately. Populus tomentosa can also be used to cut thick branches from tufted plants, leaving several plates of branches and leaves above, bury all the cadres in yellow sandy soil or vermiculite, expose the branches and leaves, often water to keep moist, and take root after half a year.

Sowing, cutting Propagation and cultivation techniques of Silk Cotton Wood

Silk cotton is a kind of species with high ornamental, garden value and high medicinal value, which is the first choice for many users engaged in forestry planting. Let's talk about the cultivation techniques of silk cotton together.

Silk cotton wood

Cultivation techniques

Mainly by sowing and cutting propagation.

Sowing seeds

Collect seeds in autumn, rub off aril, wash and dry, store in layers, and sow in spring next year.

Cuttage

It is carried out in March in spring, or softwood cuttings can be used in the rainy season. The cuttings are 15 cm long and 1 cm deep, and the bed soil is sandy loam. After insertion, the cuttings are often watered to keep the soil moist. After about a month, they can take root and survive.

The seedlings should be planted in fertile and loose land, and it is better to transplant in spring. Before planting, the planting holes should be dug according to the root system, padded with loose soil and mature stable manure, and the roots should be obstructed and compacted with fine soil. Planting should not be too deep, so as to avoid shady tillers in the roots. If the leaves are properly shaded in summer, the leaves will not be too thick, and it is easy to form beautiful red leaves in autumn, which will increase the effect of viewing leaves.

Silk cotton is a warm temperate tree species, which is produced in the central and northern provinces of China, and also distributed in Zhejiang and Fujian. Like light, slightly resistant to shade, cold, but also more resistant to drought. Suitable for fertile, moist land, neutral soil, slightly acidic soil can adapt. The root system is well developed and the germination ability is strong.

Positive tree species, slightly shady, strong adaptability to climate, cold tolerance, drought tolerance, moisture tolerance, barren tolerance, lax soil requirements. The root system is deep and developed, can resist wind, the root tiller germination ability is strong, the growth is slow. The resistance and absorption ability to dioxide, hydrogen fluoride and chlorine are strong, and the absorption ability to dust is also strong.

Insert bar

I. Collection of silk, cotton and wood panicles

The collection of cuttings is generally carried out in the dormant period from defoliation in autumn to sap flow in spring, combined with the winter shearing of silk cotton, silk and cotton, to select annual branches with strong growth, full Lignification and free of diseases and insect pests.

II. Storage of silk cotton cuttings

The hardwood cuttings in spring need to store the branches in winter. The storage method is to cut the branches into about 15 cm and choose the shade with high topography and good drainage. The ditch is 1 meter wide and 60 to 80 cm deep. The length depends on the number of cuttings. First spread a layer of wet sand 5 cm thick at the bottom of the ditch, cut the cuttings in a bundle of 50 branches, put them in the ditch in layers, fill them with wet sand when the cuttings are 20 cm above the ground, cover the soil into a roof ridge, and insert a grass in the middle to facilitate ventilation.

III. Treatment of silk, cotton and wood cuttings

In order to improve the survival rate of cuttings, the cuttings were soaked with running water 6 to 8 days before cutting. if it is stagnant water, the water must be changed every day. When there is an obvious irregular tumor at the incision, the cuttings are carried out. It can also be soaked in 1% sucrose solution for 24 hours, which can significantly improve the survival rate of cuttings.

IV. Cutting techniques of silk, cotton and wood

Silk cotton wood

Silk cotton wood

Meticulous soil preparation before cutting, adequate application of basic fertilizer to make the soil loose and sufficient water. First use the tool to open the hole, insert the cuttings along the hole, and then seal the hole firmly, the cutting depth is 2 big 3 of the length of the cuttings, the plant spacing is 20 cm, the row spacing is 40 cm, and water thoroughly after cutting.

V. tending and management of silk, cotton and wood

1. To set up a shade shed to preserve soil moisture, reduce irrigation times and prevent soil hardening. At the end of cutting, cover the seedling bed with plastic film, seal it with soil around, and use sunshade net to shade the sun to avoid sun exposure. If the temperature is too high and the humidity is too high, open the two ends of the film to make the air circulate. Generally, it can take root in about three weeks. After the cuttings take root, the mulch is gradually removed in batches.

2. Keep the seedbed moist after irrigation cuttings.

Timely supply of water needed for cuttings to take root. In the seedling stage, irrigate with small water, clear water, in order to infiltrate the seedling bed as the degree, do not flood irrigation, in order to prevent slime of young leaves, burns. Generally every 3 to 5 days irrigation, a total of 2 to 3 times of irrigation.

3. After topdressing cutting for 40 days, in order to make the seedlings grow healthily, quick-acting fertilizers such as mature human feces and urine, urea, ammonium sulfate and potassium dihydrogen phosphate should be applied.

4. Weeding in the loose soil and weeding nursery starts from April to September and removes weeds at any time. Loose soil small seedlings should be shallow, large seedlings should be deep, generally loose soil depth of 2 to 4 cm, and then increased to 8 to 10 cm, seedling hardening period should stop loosening soil and weeding. [2]

Raising seedlings

(1) the way of raising seedlings. Using flat bed to raise seedlings, turn the soil deeply at the end of autumn, apply 6000 to 8000 kg of organic fertilizer per hectare during soil preparation, rake and flatten it the following spring, make a border 1 meter wide, and then irrigate once, after water infiltration, flatten and rake fine when the soil moisture is suitable; (2) sowing time. Generally, the sowing time is from mid-late March to early April, and it is better to sow early at the right time. Weeds breed quickly in the evening, and it is easy to "grass eat seedlings", which causes difficulties in seedling management; (3) sowing rate. The general routine dosage is about 10 kg per 667 square meters. The sowing rate is closely related to seed cleanliness and germination rate. High purity, high germination rate, small sowing amount; on the contrary, large sowing amount; (4) sowing. Generally use strip sowing, with ploughing trench, ditch depth of 3 to 5 cm, row width of 20 to 25 cm. Spread the seeds evenly into the ditch, cover the soil with a thickness of about 1 cm, and press it properly after covering. Seedlings emerge in about 20 days under suitable soil moisture conditions.

Seedling stage management

The main results are as follows: (1) after the emergence of cotyledons, interseedlings and supplementary seedlings generally grow 1 or 2 pairs of true leaves, and it is easy to cause the seedlings to be weak if they are too late. Generally leave seedlings according to the triangle, the distance between plants is about 15 cm. The principle of inter-seedling is "getting rid of weakness and staying strong, getting rid of density and leaving thin, getting rid of disease and staying strong", combined with inter-seedling to replenish seedlings. The seedlings can be carried out at once or several times. Generally after watering or rain soil softening time seedlings, pull out the seedlings with weak growth or damaged by diseases and insect pests, pay attention to do not hurt the adjacent seedlings, while removing weeds. Then properly suppressed and irrigated to make the root system of the seedlings close to the soil.

(2) Irrigation and topdressing should be irrigated timely and appropriately according to soil moisture. Before the growth of true leaves in the aboveground part to the rapid growth of seedlings, properly control the water and "squat seedlings". Irrigate 2 to 3 times after squatting seedlings, irrigation amount in rainy season depends on rainfall, reduce irrigation times in late growth stage, prevent seedlings from growing too young in autumn, and irrigate cold water once at the beginning of November. Combined with watering, topdressing can be applied for 2 to 3 times, and nitrogen fertilizer can be applied in the early stage of seedling growth to promote the late stage of seedling growth and increase the degree of Lignification of seedlings.

(3) weeding by mid-tillage and timely weeding can prevent the breeding of weeds and soil consolidation, and increase soil permeability. Loosening soil combined with weeding, weeding should be carried out in accordance with the principle of "removing early, removing small, except". Loosen the soil and preserve soil moisture in time after rain and watering. Generally, the seedling height can reach more than 1 meter in the same year, and it can be used for landscaping after 2 years, and it can also be used as the rootstock for grafting Hokkaido yellow poplar or Fufang vine.

Three propagation methods of Populus tomentosa in Hokkaido

Hokkaido Populus tomentosa is a variety of Populus tomentosa, which is native to Japan and grows fast. in the north of China, Hokkaido Populus tomentosa is an excellent tree species to increase green and color in winter. The editor will introduce to you three breeding methods of Hokkaido boxwood. Friends who are interested in Hokkaido boxwood can learn about it together.

Hokkaido boxwood

1. Cutting method

The materials selected for cutting can be hardwood, twig, single bud and leaf. The sand bed should be based on the principle of water storage and ventilation without stagnation, the medium should be disinfected with potassium permanganate or carbendazim, and the cuttings should be soaked in rooting water. After insertion, the inserting bed should be compacted and not overwatered.

2. Sowing method

The red aril should be removed and dried in time after the seed is harvested. The seeds should be stored in sand before sowing, the humidity should not be too high and the temperature should not exceed 15 ℃. Sowing early after soil thawing, sowing early rather than late, late sowing, rising air temperature and soil temperature, fast rooting and sprouting, long roots, easy to break the roots during sowing, causing damage to the seeds.

III. Grafting method

In order to cultivate large size and large quantities of seedlings in a short period of time, silk cotton can be used as rootstock grafting. Silk cotton has developed root system, high survival rate and fast growth rate, which can grow into seedlings with a DBH of 5 cm to 6 cm in 3 to 4 years, and the crown of Hokkaido boxwood is formed early and has strong cold resistance.