How does Yellow Poplar reproduce?

Populus tomentosa is a common greening tree on green land and on both sides of the road. it has high ornamental value, and some of them specialize in developing bonsai, so how does boxwood breed?

First, sowing and reproduction

(1) Land selection and soil preparation: at the beginning of September, loose, fertile and well-drained sandy soil was selected as the seeding bed, and the base fertilizer (organic fertilizer) was applied, mixed with insecticides and fungicides, and the soil was deeply turned and leveled as a seeding bed.

(2) sowing: 50-60 grams per square meter, first mix the seeds with an appropriate amount of sand, then evenly sprinkle them on the seedbed, then cover them with 1-1.5 mm fine soil and cover them with grass curtains to moisturize.

(3) Post-sowing management techniques: the sown seeds only grow radicles but do not germinate in the same year. In order to prevent frost injury, 5-8 cm soil should be covered on the grass curtain before the soil is frozen in mid-late November. In the middle and late March of the following year, remove the grass curtains and cover the soil, and then build a plastic arch shed on the seedbed, the temperature needs to be controlled between 25 and 30 degrees. It takes about 20 days for the germ to grow out of the soil, after which the temperature in the shed should be kept between 20 and 25 ℃, and the temperature should be properly watered. The temperature is stable in late April, and the plastic arch can be removed. The seedling stage needs to pull grass and loosen the soil, timely irrigation and topdressing, as well as timely prevention and control of diseases and insect pests.

2. Cutting propagation

(1) Land selection and preparation: select the land with high topography, deep soil layer, loose soil and good drainage and irrigation. After the grass roots and stones are removed, the soil is formed into a high bed of about 1-1.2m, and then 1500 times of mancozeb and 1000 times of imidacloprid are used to eliminate underground pests and harmful bacteria. After leveling the nursery bed, flatten it with a spade, pour 10% rotting rare human feces and urine, and then coat the bed with a layer of yellow soil or sifted coke ash, which is about 5 cm thick.

(2) cuttings: cuttage propagation can be carried out at any time, but it is better to choose young shoots growing in summer as cuttings. The cuttings select the excellent branches that are lignified or semi-lignified in the same year. After collection, cutting cuttings should be carried out in a cool leeward place. When cutting, if the internodes have grown branchlets, cut them off along the upper and lower half of the nodes, then cut the stem nodes into two halves according to the location of the branchlets, and cut them into two branches for cutting. if the branches do not grow branchlets, they need to leave 2 nodes. the upper end is cut into a flat section 1 cm above the bud, and the lower end is cut into a horseshoe-shaped or flat section 0.5 cm from the bud.

(3) cutting method: the depth of the big branch should not be too deep, the depth of the big branch should be 1 cm in the soil for the next stem node, the branchlet should be cut flat and face down, the depth should be 1 cm when the mother plant enters the soil, and the inclination of the cuttings and the ground is about 45 degrees. Shallow oblique cutting is beneficial to the early rooting and survival of cuttings. After cutting, the soil around the cuttings needs to be compacted, and then watered once to make the lower part of the cuttings and the soil firm. The row spacing of cuttings is generally 12-15 cm, and the plant spacing is 6-8 cm. When cutting, do not leave too many leaves on the cuttings, but do not cut off all the leaves. The lower leaves can be cut off with petioles, and the upper leaves are left with 2 leaves. Then, according to the size of the leaves, each leaf will be cut again on 1-2 to 2-3, to reduce the excessive consumption of water and nutrients.

(4) Management after cutting: after cutting, it is necessary to set up a shed for shade, reduce transpiration and avoid direct sunlight on the seedbed. Early spring or late autumn cutting, but also need to cover the film, so as to prevent winter damage. After cutting, we should also pay attention to regular watering, so as to keep the soil of the seedling bed moist, and it is appropriate that the soil on the surface of the seedling bed is not white. Topdressing combined with watering can be carried out, or foliar spraying can be carried out with potassium dihydrogen phosphate plus urea. Weeding should be carried out carefully and cuttings should not be collided.

Generally speaking, Populus tomentosa has two propagation methods of sowing and cutting, of which sowing is mostly carried out in September, and cutting can be done at any time.