Planting Methods and Cultivation Techniques of Buxus chinensis

Populus tomentosa is not strict on soil, sandy soil, loam, brown soil can be planted, but it is best to contain organic rich loam land. The land type is required to be flat when preparing the land. Combined with deep ploughing, add organic fertilizer, about 2000 kilograms per mu. When applying base fertilizer, we should pay attention to the full maturity of organic fertilizer and apply it deeply in the planting hole. Under the climatic conditions in Beijing, spring is the main time to plant seedlings, which is usually two or three days before the Qingming Festival in early April. The general row spacing of Populus tomentosa planted in the open field is 0. 5 × 1.5 or 0. 4 × 1.2 meters, planting about 1000 to 1500 plants per mu.

With the increase of the age of the tree, the seedlings can be raised from another plant in the future. Populus tomentosa seedlings can be planted in holes or furrows. Before planting seedlings, according to the planned row spacing, dig holes or trench according to the planting spacing, the ditch depth should be greater than the seedling root depth, about 40 cm deep. Before planting, the base fertilizer should be applied deeply, and the fully mature organic fertilizer should be mixed with the soil and applied to the bottom of the hole. When planting, remove the nutrition bowl of the seedlings and arrange them in the ditch according to the distance between the plants, so that the roots come into contact with the soil and step on the soil. Step on the earth ball in real time after covering the soil, do not crush the earth ball, but should step on the gap between the soil ball and the tree hole. The depth of soil cover is slightly deeper than the original soil imprint, so as to prevent the soil from sinking and exposing its roots after irrigation, thus affecting its survival.

Watering

Watering is the main measure to ensure the survival of seedlings, especially the northern spring drought and less rain, large evaporation, if insufficient water supply, it will seriously affect the survival rate of seedlings. After planting seedlings, ridges can be made with soil every 4 to 6 rows to facilitate irrigation. It is required to irrigate the first time within 24 hours after planting seedlings, the second time every 3 to 5 days, and the third time every 5 to 7 days. After three times of irrigation, you can decide whether to irrigate or not according to the weather and the condition of seedlings.

The amount of water should not be too large or too small, the amount of water is too large, the soil becomes soft, and the seedlings are easy to lodge; the amount of water is too small, affecting survival. Planting seedlings after irrigation or more rainfall, seedlings are easy to lodge, tilt or root, if this phenomenon occurs, should immediately straighten, cultivate the soil, step on, otherwise because the seedlings are sprouting and growing, the stem of the seedlings will bend within a few days. When supporting seedlings, you can first dig up the soil near the roots of the seedlings, straighten the seedlings, find the direction between straight rows and plants, and then return the soil to earth. After three consecutive irrigations, when the soil of the seedling bed sinks and potholes appear, it should be leveled and filled in time. It can also be combined with ploughing to flatten the ground so that the seedlings receive the same amount of water and prevent the imbalance between drought and waterlogging. Yellow poplar trees prefer water, so they should grasp the principle of "better wet than dry" in watering.

In the seedling stage, the root system is shallow and sensitive to water, generally in order to keep the surface soil moist, should be irrigated for a small number of times. 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. However, in the later stage of growth, in order to prevent seedlings from growing and promote Lignification, irrigation should be stopped. Generally speaking, watering should be controlled at the end of summer. Irrigation time: each watering time, preferably in the morning and evening, not in the highest temperature at noon.

Intermediate ploughing and weeding

Weeding in mid-tillage is a regular work in seedling management. Ploughing and weeding are two concepts, but they can be combined.

In general, weeding is best carried out after rain or irrigation. When the soil is moist, the grass is pulled up by the roots, and the effect of loosening the soil is good. Soon after the seedlings are newly planted, most of the soil surface is exposed to the air, which is not only easy to dry, but also easy to grow weeds. During this period, intertillage and weeding should be carried out in time to promote the root development of seedlings.

In general, the roots of the seedlings should be slightly shallow ploughing, and the rows between the plants can be properly deepened, usually 3 to 5 cm. Ploughing in the rainy season can promote gas exchange and evaporation of gaseous water, which can prevent seedling waterlogging. In the northern region, it is generally dry in spring, and the growth of weeds has stopped in autumn, which should be dominated by mid-ploughing and weeding in summer. The rapid growth period of weeds is before and after the rainy season, during this period, weeding should be strengthened, and weeding should adhere to the principles of early weeding, small weeding and weeding. All the underground parts of perennial weeds must be dug out, otherwise, it will be more and more difficult to remove.

Topdressing

Topdressing can timely supplement the large amount of nutrients needed by seedlings in the period of vigorous growth and development, promote the growth and development of seedlings and improve their quality. Yellow poplar needs more phosphorus in the seedling stage, more nitrogen in the peak growing season, and more potassium in the autumn growth period.

After the seedlings are planted, 0. 5% can be sprayed on the leaves. 4% potassium dihydrogen phosphate solution should be carried out on cloudy days or when the air is moist in the morning or evening. Generally, you can spray three or four times of potassium dihydrogen phosphate on leaves every month. The newly transplanted yellow poplar 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. In the fast-growing period of seedlings, the amount of fertilizer should be increased and the times of fertilization should be increased at least once a month. Urea is available for topdressing nitrogen fertilizer, which can be divided into two methods: dry application and wet application.

Dry application can be spread and ditch application, spreading is to spread chemical fertilizer evenly on the inter-seedling soil, and then shallow hoe to cover the soil twice; ditch application is to open a ditch between the rows of seedlings, generally 15~20cm away from the seedling root, apply chemical fertilizer into the ditch, and then cover the soil. During ditch application, it should be noted that the ditch depth should be in the distribution layer of the root system, so as to facilitate the absorption of fertilizer by seedlings. Wet application is to dissolve the fertilizer in water and sprinkle it comprehensively on the seedling bed or between the rows. It is best to irrigate 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 the Beginning of Autumn. In order to prevent the seedlings from overgrowing and reduce the overwintering ability of Populus tomentosa seedlings. From August to September, the application of nitrogen fertilizer must be stopped, and the main fertilizer should be phosphorus and potassium fertilizer. Promote the Lignification and root growth of Populus tomentosa seedlings, and improve the cold resistance of seedlings.

Shaping and pruning

The yellow poplar itself has a strong top advantage, its sprouting power is strong, and the branching ability is relatively weak. Through proper shaping and pruning, the ideal trunk and plump lateral branches can be cultivated, making the tree complete, symmetrical, compact and firm.

Populus tomentosa is suitable for both winter and summer pruning. Generally, shaping and pruning is carried out in the summer and autumn tree growing season. With the shaping and pruning, the cut branches can be cut and propagated. Shaping is generally for young trees, while pruning is for big trees (or seedlings). The shaping and pruning at the seedling stage is of great significance to the later tree body and posture.

The seedlings of Populus tomentosa generally have obvious main stem, and most of the lateral branches grow in the middle and lower part of the tree. In shaping and pruning, truncation is generally not used to retain the trunk and maintain the growth potential of the top tip, so that the future growth of the tree can be straight and tall. The lateral branches at the base of the young trees can be completely truncated, or light truncated, leaving only a small number of buds.

As an ornamental tree, yellow poplar is mostly steeple-shaped and conical. In general, the pruning of adult trees is only to cut off the overgrown branches and competitive branches that sprout from the self-drying stem to avoid the phenomenon of double-head and double-stem. If there is a multi-headed phenomenon, which affects the height development of the crown, we should find out the main branch or replace the main branch as soon as possible to cultivate the advantage of height growth and make the lateral branches distribute evenly. In general, when cultivating skeleton branches, only the lower part of the 30~40cm trunk is exposed, and the upper part of the trunk is evenly distributed; it can also be kept high according to the needs, depending on the future application.

Seedling protection

In the seedling stage, the seedling tissue is young, coupled with the planting time is not long, the plant root system is not very developed, the root is not deep, at this time the seedling resistance is not strong. Seedling protection is very important. Correct cultivation techniques must be adopted in production to promote the robust growth of seedlings, enhance resistance, and create environmental conditions for seedlings that are not conducive to the occurrence and development of disastrous factors, so as to improve the yield and quality of seedlings.

1. Frost harm

In early spring or late autumn, when the seedlings were not lignified, the tissues were tender and had more water content. When the air temperature dropped below 0 ℃ in a short time, the young cells of the seedlings were frozen and dehydrated. In the cultivation technical measures, we should pay attention to the following points: when selecting the planting site, the seedlings should not be planted in the forests, narrow valleys and low-lying areas where the cold current is easy to gather; suitable time to plant seedlings, open field planting seedlings should not be carried out in the late autumn; in the later stage of seedling growth, stop applying nitrogen fertilizer, little irrigation or no irrigation, in order to control overgrowth and promote seedling Lignification. According to the weather forecast, through fumigation measures, ignite semi-dry firewood to fill the ground with smoke and prevent frost. In general, the frost resistance of Populus tomentosa seedlings is very strong, as long as a little attention is needed in production.

2. Overwintering protection

The yellow poplar has strong cold resistance, and the adult tree is-23. The green leaves can be kept at a low temperature of 9 ℃. However, for the production units, it is necessary to have proper winter protection at the seedling stage. Winter protection can accelerate the growth of seedlings, improve the quality of seedlings, and lay a good foundation for the rapid growth of seedlings at the beginning of spring next year. Especially in the northern region, the winter is cold and the air is dry. If the seedlings are not protected, although the yellow poplar has strong cold resistance and the plants will not die, the "autumn shoots" that grow in autumn will appear because of the low Lignification degree. Affect the seedling growth height; and the seedlings recover slowly in the coming spring, which is not conducive to the rapid production of high-quality seedlings. Before the land is frozen in winter, after the seedlings are filled with frozen water, the support film mulching method is used to protect the seedlings.

Drive a stake every 5 to 6 meters between the two ends and the middle of the seedling row, the height of the stake is about 20cm higher than the height of the seedling, and pull an iron wire or other stronger rope on the stake. Use plastic film to set up a small "tent" for each row of seedlings, both sides and ends of the plastic film are buried with soil, impermeable. Until the temperature rebounded steadily in the spring of the following year. The plastic film mulching method of support has the function of delaying soil freezing period, thawing period ahead of time and director's growing period. At the same time, because there is no wind and high humidity in the shed, the seedlings will not have physiological drought. The seedlings can grow rapidly after opening the plastic film in the coming year. After the seedlings are protected by this method in winter, the growth of seedlings is twice as large as that without protection.

Pest control

Yellow poplar has strong resistance to diseases and insect pests and is not easy to be harmed by diseases and insect pests. However, because the garden nursery belongs to intensive cultivation and management, with high planting density and many tree varieties, pests of other tree species are easy to spread, such as red spiders and aphids in summer drought season. The main pests of yellow poplar are yellow poplar inchworm and longicorn beetle.

The yellow poplar inchworm is harmful to the larvae eating leaves, which mainly occurs in the season with mild climate and abundant rainfall. Prevention and control methods: in the early stage of larval damage, spray control in time, the control agents are: 1000 times liquid of trichlorfon crystal or 5000 times liquid of dipterex.

Longicorn beetles are mainly brown longicorn beetles, which mainly feed on the trunk or main branches by larvae, and the harm period is mainly in the high temperature and dry season. Control methods: enhance the tree potential, longicorn beetles are secondary pests, mainly harm the weak trees, pay attention to drought resistance in the high temperature and drought season, and keep the tree potential exuberant. Kill adults manually at night or noon in a muggy night. Poison the larvae and inject 40% dimethoate emulsion 5 to 10 times into the worm track with a syringe.

Cultivation techniques of Yellow Poplar

Populus tomentosa is not strict on soil, sandy soil, loam, brown soil can be planted, but it is best to contain organic rich loam land. The land type is required to be flat when preparing the land. Combined with deep ploughing, add organic fertilizer, about 2000 kilograms per mu. When applying base fertilizer, we should pay attention to the full maturity of organic fertilizer and apply it deeply in the planting hole. Under the climatic conditions in Beijing, spring is the main time to plant seedlings, which is usually two or three days before the Qingming Festival in early April. The general row spacing of Populus tomentosa planted in the open field is 0. 5 × 1.5 or 0. 4 × 1.2 meters, planting about 1000 to 1500 plants per mu.

With the increase of the age of the tree, the seedlings can be raised from another plant in the future. Populus tomentosa seedlings can be planted in holes or furrows. Before planting seedlings, according to the planned row spacing, dig holes or trench according to the planting spacing, the ditch depth should be greater than the seedling root depth, about 40 cm deep. Before planting, the base fertilizer should be applied deeply, and the fully mature organic fertilizer should be mixed with the soil and applied to the bottom of the hole. When planting, remove the nutrition bowl of the seedlings and arrange them in the ditch according to the distance between the plants, so that the roots come into contact with the soil and step on the soil. Step on the earth ball in real time after covering the soil, do not crush the earth ball, but should step on the gap between the soil ball and the tree hole. The depth of soil cover is slightly deeper than the original soil imprint, so as to prevent the soil from sinking and exposing its roots after irrigation, thus affecting its survival.

Watering

Watering is the main measure to ensure the survival of seedlings, especially the northern spring drought and less rain, large evaporation, if insufficient water supply, it will seriously affect the survival rate of seedlings. After planting seedlings, ridges can be made with soil every 4 to 6 rows to facilitate irrigation. It is required to irrigate the first time within 24 hours after planting seedlings, the second time every 3 to 5 days, and the third time every 5 to 7 days. After three times of irrigation, you can decide whether to irrigate or not according to the weather and the condition of seedlings.

The amount of water should not be too large or too small, the amount of water is too large, the soil becomes soft, and the seedlings are easy to lodge; the amount of water is too small, affecting survival. Planting seedlings after irrigation or more rainfall, seedlings are easy to lodge, tilt or root, if this phenomenon occurs, should immediately straighten, cultivate the soil, step on, otherwise because the seedlings are sprouting and growing, the stem of the seedlings will bend within a few days. When supporting seedlings, you can first dig up the soil near the roots of the seedlings, straighten the seedlings, find the direction between straight rows and plants, and then return the soil to earth. After three consecutive irrigations, when the soil of the seedling bed sinks and potholes appear, it should be leveled and filled in time. It can also be combined with ploughing to flatten the ground so that the seedlings receive the same amount of water and prevent the imbalance between drought and waterlogging. Yellow poplar trees prefer water, so they should grasp the principle of "better wet than dry" in watering.

In the seedling stage, the root system is shallow and sensitive to water, generally in order to keep the surface soil moist, should be irrigated for a small number of times. 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. However, in the later stage of growth, in order to prevent seedlings from growing and promote Lignification, irrigation should be stopped. Generally speaking, watering should be controlled at the end of summer. Irrigation time: each watering time, preferably in the morning and evening, not in the highest temperature at noon.

Intermediate ploughing and weeding

Weeding in mid-tillage is a regular work in seedling management. Ploughing and weeding are two concepts, but they can be combined.

In general, weeding is best carried out after rain or irrigation. When the soil is moist, the grass is pulled up by the roots, and the effect of loosening the soil is good. Soon after the seedlings are newly planted, most of the soil surface is exposed to the air, which is not only easy to dry, but also easy to grow weeds. During this period, intertillage and weeding should be carried out in time to promote the root development of seedlings.

In general, the roots of the seedlings should be slightly shallow ploughing, and the rows between the plants can be properly deepened, usually 3 to 5 cm. Ploughing in the rainy season can promote gas exchange and evaporation of gaseous water, which can prevent seedling waterlogging. In the northern region, it is generally dry in spring, and the growth of weeds has stopped in autumn, which should be dominated by mid-ploughing and weeding in summer. The rapid growth period of weeds is before and after the rainy season, during this period, weeding should be strengthened, and weeding should adhere to the principles of early weeding, small weeding and weeding. All the underground parts of perennial weeds must be dug out, otherwise, it will be more and more difficult to remove.

Topdressing

Topdressing can timely supplement the large amount of nutrients needed by seedlings in the period of vigorous growth and development, promote the growth and development of seedlings and improve their quality. Yellow poplar needs more phosphorus in the seedling stage, more nitrogen in the peak growing season, and more potassium in the autumn growth period.

After the seedlings are planted, 0. 5% can be sprayed on the leaves. 4% potassium dihydrogen phosphate solution should be carried out on cloudy days or when the air is moist in the morning or evening. Generally, you can spray three or four times of potassium dihydrogen phosphate on leaves every month. The newly transplanted yellow poplar 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. In the fast-growing period of seedlings, the amount of fertilizer should be increased and the times of fertilization should be increased at least once a month. Urea is available for topdressing nitrogen fertilizer, which can be divided into two methods: dry application and wet application.

Dry application can be spread and ditch application, spreading is to spread chemical fertilizer evenly on the inter-seedling soil, and then shallow hoe to cover the soil twice; ditch application is to open a ditch between the rows of seedlings, generally 15~20cm away from the seedling root, apply chemical fertilizer into the ditch, and then cover the soil. During ditch application, it should be noted that the ditch depth should be in the distribution layer of the root system, so as to facilitate the absorption of fertilizer by seedlings. Wet application is to dissolve the fertilizer in water and sprinkle it comprehensively on the seedling bed or between the rows. It is best to irrigate 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 the Beginning of Autumn. In order to prevent the seedlings from overgrowing and reduce the overwintering ability of Populus tomentosa seedlings. From August to September, the application of nitrogen fertilizer must be stopped, and the main fertilizer should be phosphorus and potassium fertilizer. Promote the Lignification and root growth of Populus tomentosa seedlings, and improve the cold resistance of seedlings. Introduction to planting methods of Populus tomentosa

There are many ways to plant yellow poplar, it can be said that everyone has their own set of methods to grow yellow poplar! Populus tomentosa is planted by people because of its high utilization value! And yellow poplar is easy to manage, not like other plants, it is difficult to plant successfully! Populus tomentosa is tall and straight, and its seedlings are easy to transplant. Yellow poplar has less noise, so it can be seen on the side of the road. It is not difficult to plant yellow poplar. Now I would like to introduce to you a method of planting yellow poplar that is suitable for everyone.

Planting method

Populus tomentosa is not strict on soil. Sandy soil, loam and brown soil can all be planted, but it is better to have soil rich in organic matter.

Populus tomentosa planting

Land. The land type is required to be flat when preparing the land. Combined with deep ploughing, add organic fertilizer, about 2000 kilograms per mu. When applying base fertilizer, we should pay attention to the full maturity of organic fertilizer and apply it deeply in the planting hole. Under the climatic conditions in Beijing, spring is the main time to plant seedlings, which is usually two or three days before the Qingming Festival in early April. The general row spacing for open field planting of Populus tomentosa is 0.5 × 1.5 or 0.4 × 1.2 meters, with about 1000 × 1500 trees per mu. With the increase of the age of the tree, the seedlings can be raised from another plant in the future. Nutrition bowl seedlings of Populus tomentosa in Hokkaido can be planted in holes or furrows. Before planting seedlings, according to the planned row spacing, dig holes or trench according to the planting spacing, the ditch depth should be greater than the seedling root depth, about 40 cm deep. Before planting, the base fertilizer should be applied deeply, and the fully mature organic fertilizer should be mixed with the soil and applied to the bottom of the hole. When planting, remove the nutrition bowl of the seedlings and arrange them in the ditch according to the distance between the plants, so that the roots come into contact with the soil and step on the soil. Step on the earth ball in real time after covering the soil, do not crush the earth ball, but should step on the gap between the soil ball and the tree hole. The depth of soil cover is slightly deeper than the original soil imprint, so as to prevent the soil from sinking and exposing its roots after irrigation, thus affecting its survival.

Post-planting management

The main results are as follows: (1) watering is the main measure to ensure the survival of seedlings, especially the northern spring drought, less rain and large evaporation, if the water supply is insufficient, it will seriously affect the survival rate of seedlings. After planting seedlings, ridges can be made with soil every 4 to 6 rows to facilitate irrigation. It is required to irrigate the first time within 24 hours after planting seedlings, the second time every 3 to 5 days, and the third time every 5 to 7 days. After three times of irrigation, you can decide whether to irrigate or not according to the weather and the condition of seedlings. The amount of water should not be too large or too small, the amount of water is too large, the soil becomes soft, and the seedlings are easy to lodge; the amount of water is too small, affecting survival. Planting seedlings after irrigation or more rainfall, seedlings are easy to lodge, tilt or root, if this phenomenon occurs, should immediately straighten, cultivate the soil, step on, otherwise because the seedlings are sprouting and growing, the stem of the seedlings will bend within a few days. When supporting seedlings, you can first dig up the soil near the roots of the seedlings, straighten the seedlings, find the direction between straight rows and plants, and then return the soil to earth. After three consecutive irrigations, when the soil of the seedling bed sinks and potholes appear, it should be leveled and filled in time. It can also be combined with ploughing to flatten the ground so that the seedlings receive the same amount of water and prevent the imbalance between drought and waterlogging. Yellow poplar trees prefer water, so they should grasp the principle of "better wet than dry" in watering. In the seedling stage, the root system is shallow and sensitive to water, generally in order to keep the surface soil moist, should be irrigated for a small number of times. 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. However, in the later stage of growth, in order to prevent seedlings from growing and promote Lignification, irrigation should be stopped. Generally speaking, watering should be controlled at the end of summer. Irrigation time: each watering time, preferably in the morning and evening, not in the highest temperature at noon.

(2) Intertillage weeding and weeding is a regular work of seedling management. Ploughing and weeding are two concepts, but they can be combined. In general, weeding is best carried out after rain or irrigation. When the soil is moist, the grass is pulled up by the roots, and the effect of loosening the soil is good. Soon after the seedlings are newly planted, most of the soil surface is exposed to the air, which is not only easy to dry, but also easy to grow weeds. During this period, intertillage and weeding should be carried out in time to promote the root development of seedlings. In general, the roots of the seedlings should be slightly shallow ploughing, and the rows between the plants can be properly deepened, usually 3 to 5 cm. Ploughing in the rainy season can promote gas exchange and evaporation of gaseous water, which can prevent seedling waterlogging. In the northern region, it is generally dry in spring, and the growth of weeds has stopped in autumn, which should be dominated by mid-ploughing and weeding in summer. The rapid growth period of weeds is before and after the rainy season, during this period, weeding should be strengthened, and weeding should adhere to the principles of early weeding, small weeding and weeding. All the underground parts of perennial weeds must be dug out, otherwise, it will be more and more difficult to remove.

(3) topdressing can timely supplement the large amount of nutrients needed by seedlings in the period of vigorous growth and development, promote the growth and development of seedlings and improve their quality. Hokkaido yellow poplar needs more phosphorus in the seedling stage, more nitrogen in the peak growing season, and more potassium in the autumn growth period. After the seedlings are planted, 0.4% potassium dihydrogen phosphate solution can be sprayed on the leaves, which should be carried out on cloudy days or when the air is wet in the morning or evening. Generally, you can spray three or four times of potassium dihydrogen phosphate on leaves every month. The newly transplanted seedlings of Populus tomentosa in Hokkaido should be fertilized in the early stage, but we should pay attention to the concentration of fertilizer not too high, so as not to burn the new roots. In the fast-growing period of seedlings, the amount of fertilizer should be increased and the times of fertilization should be increased at least once a month. Urea is available for topdressing nitrogen fertilizer, which can be divided into two methods: dry application and wet application. Dry application can be spread and ditch application, spreading is to spread chemical fertilizer evenly on the inter-seedling soil, and then shallow hoe to cover the soil twice; ditch application is to open a ditch between the rows of seedlings, generally 15~20cm away from the seedling root, apply chemical fertilizer into the ditch, and then cover the soil. During ditch application, it should be noted that the ditch depth should be in the distribution layer of the root system, so as to facilitate the absorption of fertilizer by seedlings. Wet application is to dissolve the fertilizer in water and sprinkle it comprehensively on the seedling bed or between the rows. It is best to irrigate 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 the Beginning of Autumn. In order to prevent the seedlings from growing and reduce the overwintering ability of Populus tomentosa seedlings in Hokkaido. From August to September, the application of nitrogen fertilizer must be stopped, and the main fertilizer should be phosphorus and potassium fertilizer. Promote the Lignification and root growth of Populus tomentosa seedlings in Hokkaido and improve the cold resistance of seedlings.

(4) shaping and pruning Hokkaido yellow poplar itself has a strong top advantage, its sprouting power is strong, and the ability of poplar potted to form branches is relatively weak. Ideal trunk and plump lateral branches can be cultivated through proper shaping and pruning to make the tree body complete, symmetrical, compact and firm. Hokkaido yellow poplar is suitable for both winter and summer pruning. Generally, shaping and pruning is carried out in the summer and autumn tree growing season. With the shaping and pruning, the cut branches can be cut and propagated. Shaping is generally for young trees, while pruning is for big trees (or seedlings). The shaping and pruning at the seedling stage is of great significance to the later tree body and posture. The seedlings of Populus tomentosa in Hokkaido generally have obvious main stem, and most of the lateral branches grow in the middle and lower part of the tree. In shaping and pruning, truncation is generally not used to retain the trunk and maintain the growth potential of the top tip, so that the future growth of the tree can be straight and tall. The lateral branches at the base of the young trees can be completely truncated, or light truncated, leaving only a small number of buds. As an ornamental tree, Hokkaido boxwood is mostly steeple-shaped and conical. In general, the pruning of adult trees is only to cut off the overgrown branches and competitive branches that sprout from the self-drying stem to avoid the phenomenon of double-head and double-stem. If there is a multi-headed phenomenon, which affects the height development of the crown, we should find out the main branch or replace the main branch as soon as possible to cultivate the advantage of height growth and make the lateral branches distribute evenly. In general, when cultivating skeleton branches, only the lower part of the 30~40cm trunk is exposed, and the upper part of the trunk is evenly distributed; it can also be kept high according to the needs, depending on the future application.

(5) in the period of seedling protection, the seedling tissue is young, and the planting time is not long, the root system of the plant is not very developed, the root is not deep, and the stress resistance of the seedling is not strong. Seedling protection is very important. Correct cultivation techniques must be adopted in production to promote the robust growth of seedlings, enhance resistance, and create environmental conditions for seedlings that are not conducive to the occurrence and development of disastrous factors, so as to improve the yield and quality of seedlings.

OK, I have introduced the planting method of yellow poplar here, if you are interested in planting yellow poplar, you can refer to! You can also summarize a planting method of your own according to the characteristics and characteristics of yellow poplar. As the saying goes, if you want to succeed, you have to find a way. There are many ways to grow yellow poplar, not to find a set of methods suitable for you, but to find a set of methods suitable for growing yellow poplars. The planting method of yellow poplar is very easy and does not need too much management, because it has strong self-growth ability.