Poplar trees are not strict with soil. Sandy soil, loam and brown soil can all be planted, but loam rich in organic matter is the best. Land preparation requires leveling the land type. Combined with deep tillage and organic fertilizer, the yield per mu is about 2000 kg. When applying base fertilizer, we should pay attention to the fact that organic fertilizer must be fully decomposed and deeply applied in planting holes.

The planting time is under the climatic conditions in Beijing, and the seedlings are mainly planted in spring, usually two or three days before Tomb-Sweeping Day in early April. Poplar planted in the open field generally has a spacing of 0. 5× 1.5 or 0. 4× 1.2m, planting about 1000- 1500 plants per mu. With the growth of tree age, seedlings can be raised every other plant in the future. Boxwood seedlings can be planted in pits or ditches.

Before planting seedlings, mark designated points according to the planned row spacing, dig holes according to the points or ditch according to the planting row spacing, and the ditch depth should be greater than the root depth of seedlings, about 40 cm deep. Before planting, base fertilizer should be deeply applied, and fully decomposed organic fertilizer should be mixed with soil and applied to the bottom of the hole. When planting, take out the nutrient bowl from the seedlings, ditch according to the spacing between plants, make the roots contact the soil, fill the soil and step on it.

When stepping on the soil after covering it, don't crush the soil ball, but step on the gap between the soil ball and the tree hole. The depth of covering soil is slightly deeper than the original soil seal, so as to avoid soil subsidence and root system exposure after irrigation, which will affect the survival. ?

water

Watering is the main measure to ensure the survival of seedlings, especially in northern spring, when there is less rain and more evaporation. If the water supply is insufficient, the survival rate of seedlings will be seriously affected. After planting seedlings, the soil between rows can be ridged every 4 ~ 6 rows to facilitate irrigation. It is required to water the seedlings for the first time within 24 hours after sowing, for the second time every 3-5 days and for the third time every 5-7 days. After three times of irrigation, it can be decided whether to irrigate according to the weather and seedling conditions.

The amount of water should not be too large or too small. If there is too much water, the soil will become soft and the seedlings will easily lodging. Too little water affects survival. After irrigation or heavy rainfall, seedlings are prone to lodging, tilting or exposing their roots. If this happens, it should be straightened, ridged and covered immediately, otherwise, with the germination and growth of seedlings, the seedlings will become bent in a few days.

When supporting the seedlings, you can dig up the soil near the roots of the seedlings, straighten the seedlings, find the direction between the straight line and the plants, and then return the soil to be practical. After planting seedlings three times in a row, when the soil in the seedbed sinks and pits appear, it should be leveled and filled in time. It can also be combined with intertillage to level the ground, so that the seedlings can get the same amount of water and prevent uneven drought and flood. Poplar likes water, so it is necessary to master the principle of "rather wet than dry" when watering.

At seedling stage, the root system is shallow and sensitive to water. Generally, the surface soil should be kept moist, and a small amount of irrigation should be carried out many times. In the fast-growing period of seedlings, the growth is rapid and the water demand is large, so it should be irrigated with large water to make it dry and wet clearly and thoroughly. However, irrigation should be stopped in the late growth stage to prevent seedlings from growing white and promote lignification. Generally, watering should be controlled at the end of summer.

Irrigation time: it is best to water it once in the morning and once in the evening, not at noon when the temperature is the highest.

Step 3 weed

Generally, intertillage weeding is best carried out after rain or irrigation. When the soil is wet, uproot the grass and loosen the soil well. Soon after the seedlings are newly planted, most of the soil surface layer is exposed to the air, which is not only extremely dry, but also easy to breed weeds. During this period, intertillage weeding should be carried out in time to promote the root development of seedlings. Generally, the root system of seedlings should be cultivated shallowly, and the rows between plants can be deepened appropriately, generally 3 ~ 5cm.

Cultivation in rainy season can promote gas exchange and evaporation of gaseous water, and prevent seedlings from waterlogging. The northern area is generally dry in spring and weeds have stopped growing in autumn. During these two periods, intertillage was the main method, and weeding was the main method in summer. The fast-growing period of weeds is around the rainy season. During this period, weeding should be strengthened and the principle of early weeding, small weeding and large weeding should be adhered to. For perennial weeds, all underground parts must be dug up, otherwise it will become more and more difficult to remove.

4. Surface treatment

It can supplement the demand for nutrients in the vigorous growth period of seedlings in time, promote the growth and development of seedlings and improve the quality. Boxwood needs more phosphorus in seedling stage, more nitrogen in peak season and more potassium when it stops growing in autumn. After the seedlings are planted, 0. 4% potassium dihydrogen phosphate solution can be sprayed on leaves, which should be carried out on cloudy days or when the air is humid in the morning and evening.

Generally, potassium dihydrogen phosphate can be sprayed on leaves three or four times a month. Newly transplanted boxwood seedlings should be fertilized in the early stage, but the fertilizer concentration should not be too high to avoid burning new roots. In the fast-growing period of seedlings, the amount and frequency of fertilization should be increased, at least once a month. Urea can be used as topdressing nitrogen fertilizer, which can be divided into dry application and wet application.

Dry application can be spread and furrow application. Spreading is to spread the chemical fertilizer evenly on the soil between seedlings, and cover the soil with shallow hoe 1-2 times after spreading; Ditch application is to ditch between rows of seedlings, generally at the distance of 0/5-20 cm from seedling root/kloc-,apply chemical fertilizer into the ditch, and then cover the soil. When ditching, we should pay attention to the depth of ditching in the root distribution layer, so as to facilitate the seedlings to absorb fertilizer.

Wet application is to dissolve fertilizer in water and spread it on the seedbed or between rows. It is best to water it again after application to avoid burns. The application of nitrogen fertilizer should be carried out in spring and summer, and the last application of nitrogen fertilizer should not be later than "beginning of autumn". Prevent the virtual growth of seedlings and reduce the overwintering ability of boxwood seedlings. Nitrogen fertilizer must be stopped from August to September, and phosphorus and potassium fertilizer are the main ones. Promote the lignification and root growth of boxwood seedlings and improve the cold resistance of seedlings.

5. Plastic surgery

Cut off the long branches, overlapping branches and redundant branches that affect the tree shape at any time during the growth period. Buxus buxus germinates faster. Generally, after new buds germinate, the top 1-2 nodes are cut off to prevent excessive growth. After the boxwood bears fruit, it should be picked in time to avoid consuming nutrients and affecting the growth of the tree.

Step 6 turn the washbasin over

Generally, it is carried out once every 2-3 years, preferably before germination in spring. Cutting off some old roots and roots that are too long and too dense, replacing 1/2 old soil and plugging it with fertile and loose culture soil are beneficial to root development.

Extended data

Boxwood is produced in the central provinces of China, and it is wild in mountainous areas below the altitude of1300 m. There are many cultivations in the Yangtze River basin and its south. Like light, but also more tolerant to shade, suitable for growing in fertile, loose and humid places, acidic soil, neutral soil or slightly alkaline soil can adapt. Strong germination and pruning resistance.

Baidu encyclopedia-boxwood

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