The latest culture method of potted boxwood

Boxwood, melon seeds, yellow poplar, Jinshu yellow poplar, etc., are yellow poplar shrubs or small trees of the genus Populus tomentosa, with graceful leaves such as bean cloves, thick and shiny leaves, evergreen all the year round, hedges and large flower beds in gardens, trimmed into balls or other plastic cultivation, decorated with rocks or bonsai, let's take a look at the breeding methods of potted boxwood.

Growth habits of Populus tomentosa

Yellow poplar likes fat loose loam, slightly acidic soil or slightly alkaline soil can adapt, can also grow in calcareous soil, pot cultivation can use mature pastoral soil or rotten leaf soil mixed with appropriate amount of rice chaff ash. Resistant to overcast and light, like moist, can withstand cloudy and rainy weather for a month or so, but avoid stagnant water for a long time. Drought tolerance, as long as the surface soil or basin soil is not completely dry, there is no abnormal performance. Heat-resistant and cold-resistant, it can withstand summer exposure and the severe cold of minus 20 degrees Celsius, but it should be ventilated and transparent when it is hot and humid in summer. Strong tillering, resistant to pruning, easy to shape.

Sowing and propagation of Populus tomentosa

1. Sowing method: at the beginning of September, sandy soil with loose and fertile soil and good drainage was selected as sowing ground, and base fertilizer (organic fertilizer) was applied and mixed with insecticides and fungicides such as carbendazim. The sowing rate is 50 grams per square meter. After mixing the seeds with the right amount of sand, spread them evenly on the seedbed, cover with fine soil 1-1.5 mm, and cover with a layer of grass curtain to moisturize.

2. Post-sowing management: after sowing, the seeds only grow radicles and do not germinate in the same year, in order to prevent frost injury, cover the grass curtain with soil of 5cm and 8cm before freezing in the middle and last ten days of November. In the middle and last ten days of March, the grass curtain and soil cover were removed, and the plastic arch shed was built on the seedling bed, and the temperature was controlled at 25: 30 ℃. The germ grew out of the soil in about 20 days, and then the temperature in the shed was controlled between 20 and 25 ℃, and properly watered. When the temperature was stable in late April, the plastic arch shed was removed.

Cutting Propagation of Populus tomentosa

1. Nursery bed preparation: the cutting seedbed should choose the land with high topography, deep soil layer, loose soil and good drainage and irrigation. After removing the grass roots and stones, the beds were formed into a high bed of about 1mm and 1.2m, and irrigated with 1000 times of imidacloprid and 1500 times of mancozeb to remove 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 cover the bed with a layer of sifted coke ash or yellow soil, about 5 cm thick.

2. Cuttings selection: yellow poplar cuttings select excellent branches that are lignified or semi-lignified in the same year, and the cuttings should be sharp. At the time of pruning, the branches that have grown branchlets are truncated along the upper and lower parts of the nodes, and then the stem nodes are cut into two halves according to the location of the branchlets, and the two branches are cut, and the branches that do not grow branchlets must be left with 2 nodes. the upper end is cut into a flat section at 1 cm above the bud, and the lower end is cut into a horse ear shape or flat cut at 0.5 cm from the bud.

3. Cutting methods: the cuttings should be shallow rather than deep, the cuttings of branchlets should be cut flat and face down, the depth of the mother plant should be 1 cm, the depth of big branch cuttings should be 1 cm in the upper middle of the next stem node, and the cuttings should be tilted to about 45 degrees with the ground. Shallow oblique cutting is conducive to the early rooting and survival of cuttings.

4. Post-cutting management: after cutting, boxwood is required to set up a shed for shade in order to reduce transpiration and direct sunlight on the seedbed. When cutting in early spring or late autumn, it should be covered with film to prevent winter damage. After cutting, the soil of the seedling bed should be watered frequently to keep the soil moist and the soil on the surface of the seedling bed should not show whiteness. Topdressing of cutting seedlings can be combined with watering, or foliar spraying can be carried out with potassium dihydrogen phosphate plus urea. The weeding work should be very meticulous and do not collide with cuttings.

Culture methods of Populus tomentosa

1, basin soil: boxwood perennial oil green, it is appropriate to use purple sand pottery basin, basin color to purple or light yellow is better. The basin shape is determined according to the modeling form, the cliff type should use a deep thousand-cylinder basin, and the oblique type or curved dry type should use an oval or rectangular basin. Bonsai soil is cultivated with mature pastoral soil or rotten leaf soil mixed with appropriate ridge bran ash, which is suitable for fertile and loose soil, and the loam with good ventilation and permeability is the best. It is advisable to carry lodging soil on the old pile.

2. Watering: yellow poplar trees prefer water, and the principle of "better wet than dry" should be grasped in watering. In the seedling stage, the root system is shallow and sensitive to water, generally to keep the surface soil moist. In the period of rapid growth of seedlings, rapid growth and large water demand should be irrigated with flood water to make it wet and dry.

3. Fertilization: Populus tomentosa needs more phosphorus in the seedling stage, more nitrogen in the peak growing season, and more potassium in the autumn growth period. After planting, the seedlings can be foliar sprayed with 0.4% potassium dihydrogen phosphate solution, generally spraying potassium dihydrogen phosphate three to four times a month. Newly transplanted boxwood seedlings should be fertilized in the early stage, but we should pay attention to the fertilizer concentration should not be too high, so as not to burn the new roots.

4. Plastic surgery: yellow poplar has strong germination. Before modeling, the trunk can be cut off to sprout new techniques around or below the cross section, and then according to the requirements of artistic modeling, it is better to climb branches and use brown silk in spring. It can also be roughly tied and cut to make a cloud sheet or steamed bread, or processed into a natural tree shape. The trunk is made into oblique dry type or prone type according to the natural trend. Populus tomentosa is very resistant to pruning and strong germination. in order to maintain a beautiful tree shape, it must be processed and reshaped frequently.

5. Turning the basin: the poplar is usually turned once every 2 ~ 3 years in the process of culture, and the turning time is better before germination in spring. Combined with turning the basin, part of the old roots and over-long and dense roots should be cut off, and the old soil should be replaced with fertile and loose culture soil to facilitate the development of roots.

6. Diseases and insect pests: the main pests of Populus tomentosa are shell insects and yellow poplar rulers, which can be killed by manual brushing or sprayed with 1500 times of dichlorvos. Huang Yang Zhi sister-in-law sprayed with 80% trichlorfon sniper powder or 40% omethoate 1000-2000 times. The main disease is coal fouling disease, which will cause defoliation. The key to prevention and control is to remove shell insects, and often spray foliar water to wash dust to make it grow well.