The city in the new century is a city with sound ecology, beautiful environment, and harmonious coexistence between man and nature. Urban gardening is an important symbol to measure the degree of urban modernization and civilization. It is a need to improve the quality of the city and meet the material and cultural living standards of the people. Big trees generally refer to deciduous trees with diameters above 20cm and evergreen trees with diameters above 15cm (or 6m in height). The transplanting of large trees can quickly reach the greening and beautifying effect of gardens. It is an indispensable means and measure for the greening and beautification of gardens, and it is also an effective means of protecting ancient trees and various trees that have become forests in the process of urban reconstruction and expansion. Big trees in large tree transplants refer to trees, sub-trees, and trees with a diameter of 10 cm or more. The source of transplanted trees from big trees can be divided into artificially cultivated large tree transplanted wood and natural growing large tree transplanted wood. The artificially cultivated transplanted trees are trees cultivated through various technical measures. The transplanted trees can adapt to various ecological environments and have a high survival rate. The natural growth of transplanted wood mostly grows in the large forest ecological environment. It does not adapt to the microclimate ecological environment after transplantation, and the survival rate is low. In the practice of transplanting large trees for many years, it has been observed that regardless of artificial, natural growth of large tree transplanted wood, as long as the transplant follows natural growth laws, it can receive a better survival effect.
I. Basic Principles of Big Tree Transplantation The basic principles of large tree transplantation include the principle of approximating habitats and the principle of tree potential balance. Approximate habitat principle: The transplanted habitat is superior to the original habitat, and the success rate of transplantation is higher. The ecological environment of trees is a relatively integrated whole, mainly referring to microclimate conditions and soil conditions such as light, gas and heat. If large trees growing on high mountains are moved into flat land and large trees growing in acid soil are moved into alkaline soils, the ecological difference is too great and the success rate of transplanting will be lower. Therefore, the best habitat for planting is similar to the original planting site. Before transplanting, the soil conditions of the original planting sites and the planting sites of the big trees need to be measured, and the soil conditions of the planting sites should be improved according to the measurement results in order to improve the survival rate of the transplanted large trees. Tree balance principle: Tree balance refers to the balance between the aboveground and underground parts of the tree. When transplanting a tree, if it causes damage to the root system, it must be pruned according to the distribution of its roots, so that the growth of the above-ground and underground parts is basically balanced. Because the nutrients that supply the roots are derived from the aerial parts, too much pruning of the branches will not only affect the landscape of the trees, but also affect the growth of the roots. If the proportion of the above-ground part is greater than that of the underground part, this imbalance can be compensated by artificial maintenance, such as shading to reduce evaporation of water, foliar fertilization, the binding of the trunk to prevent the tree water from spreading, etc. Technical measures.
(A), transplantation wood selection and transplantation time
1. The choice of transplant wood. From the analysis of plant physiology, both the artificial and natural trees have the directionality of the growth of each tree. Under the same site conditions, the canopy of the sunny slope is greater than the shady slope; the lateral roots of the sunny slope are shorter than the shady slope; the leaves of the sunny slope are greater than the shade Slope; Sunny slope more than shady slope. Therefore, you must use lead oil before transplanting and draw a mark in the direction of the diameter of the breast at the direction of the rising sun. The best choice for transplanting large trees is on sites or solitary trees where the transportation is convenient, the stand density is low, and the land is better than transplanted wood grown on slopes. With the same diameter of the transplanted wood, the tree dwarf has better transplanted wood than the tree. The tree species were better in selecting small leaves than in leaves. Conifer trees were better than broad-leaved trees. Soft-leaved trees had higher survival rates than hard broad-leaved trees.
2. Migration time. It is best to choose the best time during the dormancy period, before spring sprouting and after falling leaves in autumn. Transplantation of large trees in urban reconstruction and expansion projects can be transplanted during the growing season (summer), and the best option is to transplant them before or after cloudy days or rainfall.
(2) Disposal before root transplant The root removal before transplanting a large tree, commonly known as “stolen rootingâ€, is to excavate and remove large trees in advance for a certain period of time before transplantation, and to reserve soil balls and backfill the original soil for conservation. process. The root removal process must grasp the following aspects:
1. The root-cutting time: The root-cutting time of evergreen trees is 20-25 days before transplantation. The deciduous trees are about 30 days before transplantation. The age of trees is appropriately adjusted depending on the age of the tree. The tree-age is longer and the root-cut time is shorter. The root-cutting time will be affected by factors such as local conditions, weather, and seasons. Therefore, observations and summaries must be strengthened, and the root-causing time must be determined from time to time.
2. Trimming and shaping: Before the big tree is cut off, it is necessary to trim and reshape it, cut dead branches and weak branches, and cut the stem height according to the planting requirements to determine the height and the diameter of the crown, and maintain the tree shape and the graceful posture. Use a wax seal at the larger cutoff to prevent excessive water loss.
3, excavation root, backfill the original soil: first of all to determine the excavation diameter, the general deciduous tree species excavation diameter of 3-5 times the diameter of the trunk is appropriate. The diameter of excavated evergreen tree species is 6-8 times of the trunk diameter. Secondly, it is necessary to determine the depth of root cut. The depth of root cut is generally two-thirds of the thickness of the transplanted earth ball, and the root should be repaired when the root is cut off. It is advisable to inflict main roots and facilitate soils to be covered, and to reserve earthballs according to soil ball requirements. The last step is to backfill the original soil, remove the stones, roots and other debris from the excavated original soil, and then backfill the fine soil and fill it.
4, spray moisturizing and prevent water flooding root: After the root cut off the big tree, pay attention to regular observations, such as strong sunlight, high temperature weather to spray moisture, the rainy season, we must pay attention to prevent root water.
(3) Digging, dressing, transportation and planting
1. After the roots are cut off, the roots are cut off and the callus is rooted. Before the new roots are extracted, they are the best excavation time. The excavated transplanting wood is generally about 120 centimeters from the center of the root, and is dug vertically downwards along the outer circumference of the prescribed root width. In the process of excavation, when the rough roots are cut, the saw is broken to avoid cracking of the roots. When the lateral roots are completely excavated, the tree body is torn down and the main roots are cut off, as far as possible without damaging the root bark and fibrous roots and retaining the original soil. Finally, it is transported with a wet grass bag and a straw rope. When digging, the trees should be secured with ropes to prevent them from falling during the excavation process and break off branches or earth balls. After digging, timely repair and bind soil ball to ensure that the soil ball does not spall.
2. The quality of large tree transport loading and unloading operations is a key link in influencing the survival of large trees for transplanting, because in the process of transporting loading and unloading, it is often easy to cause physiological water shortages, earth ball scattering, bark damage, etc. Try to shorten the loading and unloading time, and perform patience and meticulous work on the trees such as proper pruning, slow loading and unloading, steady support and timely spraying of water.
3. Before planting, trees should be planted in accordance with the growth habits of the trees, and good soil (including fertility, pH, etc.) should be changed. The general tree point specification is 2-3 times the earth ball.
4. Keep the trees upright and azimuthally correct when planting. (For transplanting, enter the pits according to the original growth direction of the trees. For example, if the direction of the misaligned trees is extended, the seedling period will be extended by about 7 days, and the survival rate will be about 20% lower.) Within the cavern, remove the packaging, fill the soil with layers, and plant trees should not be too deep and should be consistent with the original planting depth. The backfill soil shall be uniformly mixed with the organic fertilizer by using the transplanted tree in situ. Transplantation wood should set up support to prevent roots from shaking and affecting survival. IV. Maintenance and management of large trees after transplanting The regeneration ability of big trees is significantly less than that of young trees. The physiological function of trees is greatly reduced in a period of time after transplantation. Trees often lose water due to lack of water supply, causing water metabolism to evaporate and die. Therefore, maintaining the balance of water metabolism of the tree is the key to the maintenance and management of transplanted trees and the improvement of survival rate. To this end, we must do a good job in the following aspects:
(A) Part of the ground moisturizing:
1, lump dry: With straw rope, burlap, moss and other materials wrapped tightly around the trunk and relatively thick branches. The dressing has a certain degree of moisture retention and heat retention. After being treated with a wrapper, it can avoid strong direct sunlight and hot air blows, reduce water evaporation from trunks and branches, and can store a certain amount of water to keep the branches moist. Three adjustable trunk temperature, reduce the damage of high temperature and low temperature on the branches, the effect is better.
2. Water spray: The above-ground part of the tree, especially the leaf surface, is susceptible to water loss due to transpiration and must be sprayed with water in a timely manner. Spraying water is required to be fine and uniform, sprayed on all parts of the ground and surrounding space to provide a humid microclimate environment for the tree. High-pressure spray gun can be used, or the water supply pipe can be installed above the canopy, and one or more sprayers can be sprayed according to the size of the canopy. The effect is better, but it is more labor-intensive. Some people adopt the method of “suspending salt water†by hanging a number of salt water bottles filled with clean water on the branches and using the principle of hanging salt water to let the water in the bottles slowly drip on the trees and add water regularly. To save materials, but the water spray is not uniform enough, the water is difficult to control, generally used to crown transplanted trees, after the branches and leaves, still need to spray moisturizing.
3. Shading: In the early stage of transplanting large trees or in high-humidity and dry season, shady shades should be used to reduce the temperature in the shed to reduce the water evaporation of the trees. In the areas where plants are planted in rows, planted in large areas, and where the density is relatively high, it is advisable to build greenhouses, save the resources and facilitate management; solitary planting trees should be planted by plants. All shades of the crown are required to be kept at a distance of about 50 centimeters from the canopy above and around the arbours to ensure that there is a certain amount of air flow space in the shed to prevent the sunken hazard of the canopy; the degree of shading is about 70%, allowing the tree to accept a certain degree of Scatter light to ensure the photosynthesis of the tree. Later, depending on the growth of the trees and seasonal changes, shading nets were gradually removed.
(b) Promoting new roots:
1. Water control: The newly transplanted trees have a weakened water absorption function in their roots and a small amount of soil moisture. Therefore, just keep the soil moist. Excessive water content in the soil will affect the permeability of the soil, inhibit the respiration of the roots, and be detrimental to rooting. Severely, it will lead to the death of rot. To this end, on the one hand, we must strictly control the amount of water, the first watering when transplanting, and then depending on the weather conditions, soil texture, inspection and analysis, and careful watering, and at the same time be careful to prevent excessive spraying of water on the ground into the root zone On the other hand, to prevent stagnant water within the tree, leave watering holes when planting, after the first watering, it should be filled or slightly higher than the surrounding ground to prevent rain or water when watering. At the same time, in the low-lying and easily reces- sible areas, open drains to ensure timely drainage on rainy days so that the rain stops. In addition, it is necessary to maintain a suitable groundwater level (generally less than 1.5 meters). When the water table is high, it is necessary to drain the gutters. When the water level rises in the flood season, deep wells can be dug in the outer part of the root system, and the water pump can be used to drain the groundwater outside the site to prevent flooding.
2. Protecting New Teeth: The germination of new teeth is a sign of the new planting of trees for physiological activities and is a hope for the survival of a large tree. More importantly, the germination of the aerial part of the tree has a natural and effective stimulating effect on the root system and can promote the germination of the root system. Therefore, in the initial stage of transplantation, especially the teeth that are re-pruned during transplanting, the teeth that are sprouted must be protected, and then the branches should be pulled out. After the trees are survived, they are trimmed. At the same time, after germination of the tree, special efforts should be made to enhance water spray, shading, disease prevention, and pest control to ensure the normal growth of tender teeth and young shoots.
3. Soil aeration: Maintaining good air permeability in the soil is conducive to root germination. To this end, on the one hand, we must do a good job of cultivating loose soil and guard against soil compaction. On the other hand, inspecting the ventilation facilities (snorkels or bamboo cages) frequently and finding clogging or stagnant water should be promptly removed to maintain good ventilation performance.
(3) Other protective measures: Newly transplanted large trees, weakened resistance, vulnerable to natural disasters, pests and diseases, and human- and livestock-related hazards, must be strengthened to prevent, specifically to do the following several protection work.
1. Supporting and fixing: The tree attracts the wind and the tree should be supported and fixed after being planted. Beware of dumping. The positive triangle pile is most conducive to the stability of the tree, and the supporting point is preferably two-thirds of the height of the tree, and a protective layer is added to prevent damage to the bark.
2, disease prevention and control of insects: adhere to the main prevention, according to the characteristics of tree species and the occurrence and development of pests and diseases, ground inspection, in the event of illness, pests, to the right medicine, timely prevention and treatment.
3, fertilization: Fertilization is conducive to restore longevity, the early stages of transplanting trees, the ability of the root sucking fertilizer is low, should be used outside the root dressing, usually about half a month. With urea, ammonium sulfate, potassium dihydrogen phosphate and other readily available fertilizer made of 0.5% -1% concentration of fertilizer solution, the election leaves sooner or later for cloudy spraying, in case of rain should be re-spray once. After the roots germinate, the soil can be fertilized.
4. Antifreeze: Newly transplanted trees are vulnerable to low temperature and should be protected from frost and heat insulation, especially to the north of tropical and subtropical species. Therefore, on the one hand, after entering the fall, we must control nitrogenous fertilizers, increase phosphorus and potassium fertilizers, and gradually extend the illumination time, increase the light intensity, so as to increase the degree of lignification of the trees and roots, and improve their ability to resist cold. On the other hand, before the onset of the winter cold wave, measures such as covering the earth, covering the ground, setting up wind barriers, and building plastic sheds can be used for protection. The conservation methods and conservation priorities of newly transplanted trees are different due to their environmental conditions, seasons, climate, actual conditions of the trees, and different tree species. It is necessary for us to carry out continuous analysis and summary in practice. Land and trees are used flexibly to achieve the desired results.
I. Basic Principles of Big Tree Transplantation The basic principles of large tree transplantation include the principle of approximating habitats and the principle of tree potential balance. Approximate habitat principle: The transplanted habitat is superior to the original habitat, and the success rate of transplantation is higher. The ecological environment of trees is a relatively integrated whole, mainly referring to microclimate conditions and soil conditions such as light, gas and heat. If large trees growing on high mountains are moved into flat land and large trees growing in acid soil are moved into alkaline soils, the ecological difference is too great and the success rate of transplanting will be lower. Therefore, the best habitat for planting is similar to the original planting site. Before transplanting, the soil conditions of the original planting sites and the planting sites of the big trees need to be measured, and the soil conditions of the planting sites should be improved according to the measurement results in order to improve the survival rate of the transplanted large trees. Tree balance principle: Tree balance refers to the balance between the aboveground and underground parts of the tree. When transplanting a tree, if it causes damage to the root system, it must be pruned according to the distribution of its roots, so that the growth of the above-ground and underground parts is basically balanced. Because the nutrients that supply the roots are derived from the aerial parts, too much pruning of the branches will not only affect the landscape of the trees, but also affect the growth of the roots. If the proportion of the above-ground part is greater than that of the underground part, this imbalance can be compensated by artificial maintenance, such as shading to reduce evaporation of water, foliar fertilization, the binding of the trunk to prevent the tree water from spreading, etc. Technical measures.
(A), transplantation wood selection and transplantation time
1. The choice of transplant wood. From the analysis of plant physiology, both the artificial and natural trees have the directionality of the growth of each tree. Under the same site conditions, the canopy of the sunny slope is greater than the shady slope; the lateral roots of the sunny slope are shorter than the shady slope; the leaves of the sunny slope are greater than the shade Slope; Sunny slope more than shady slope. Therefore, you must use lead oil before transplanting and draw a mark in the direction of the diameter of the breast at the direction of the rising sun. The best choice for transplanting large trees is on sites or solitary trees where the transportation is convenient, the stand density is low, and the land is better than transplanted wood grown on slopes. With the same diameter of the transplanted wood, the tree dwarf has better transplanted wood than the tree. The tree species were better in selecting small leaves than in leaves. Conifer trees were better than broad-leaved trees. Soft-leaved trees had higher survival rates than hard broad-leaved trees.
2. Migration time. It is best to choose the best time during the dormancy period, before spring sprouting and after falling leaves in autumn. Transplantation of large trees in urban reconstruction and expansion projects can be transplanted during the growing season (summer), and the best option is to transplant them before or after cloudy days or rainfall.
(2) Disposal before root transplant The root removal before transplanting a large tree, commonly known as “stolen rootingâ€, is to excavate and remove large trees in advance for a certain period of time before transplantation, and to reserve soil balls and backfill the original soil for conservation. process. The root removal process must grasp the following aspects:
1. The root-cutting time: The root-cutting time of evergreen trees is 20-25 days before transplantation. The deciduous trees are about 30 days before transplantation. The age of trees is appropriately adjusted depending on the age of the tree. The tree-age is longer and the root-cut time is shorter. The root-cutting time will be affected by factors such as local conditions, weather, and seasons. Therefore, observations and summaries must be strengthened, and the root-causing time must be determined from time to time.
2. Trimming and shaping: Before the big tree is cut off, it is necessary to trim and reshape it, cut dead branches and weak branches, and cut the stem height according to the planting requirements to determine the height and the diameter of the crown, and maintain the tree shape and the graceful posture. Use a wax seal at the larger cutoff to prevent excessive water loss.
3, excavation root, backfill the original soil: first of all to determine the excavation diameter, the general deciduous tree species excavation diameter of 3-5 times the diameter of the trunk is appropriate. The diameter of excavated evergreen tree species is 6-8 times of the trunk diameter. Secondly, it is necessary to determine the depth of root cut. The depth of root cut is generally two-thirds of the thickness of the transplanted earth ball, and the root should be repaired when the root is cut off. It is advisable to inflict main roots and facilitate soils to be covered, and to reserve earthballs according to soil ball requirements. The last step is to backfill the original soil, remove the stones, roots and other debris from the excavated original soil, and then backfill the fine soil and fill it.
4, spray moisturizing and prevent water flooding root: After the root cut off the big tree, pay attention to regular observations, such as strong sunlight, high temperature weather to spray moisture, the rainy season, we must pay attention to prevent root water.
(3) Digging, dressing, transportation and planting
1. After the roots are cut off, the roots are cut off and the callus is rooted. Before the new roots are extracted, they are the best excavation time. The excavated transplanting wood is generally about 120 centimeters from the center of the root, and is dug vertically downwards along the outer circumference of the prescribed root width. In the process of excavation, when the rough roots are cut, the saw is broken to avoid cracking of the roots. When the lateral roots are completely excavated, the tree body is torn down and the main roots are cut off, as far as possible without damaging the root bark and fibrous roots and retaining the original soil. Finally, it is transported with a wet grass bag and a straw rope. When digging, the trees should be secured with ropes to prevent them from falling during the excavation process and break off branches or earth balls. After digging, timely repair and bind soil ball to ensure that the soil ball does not spall.
2. The quality of large tree transport loading and unloading operations is a key link in influencing the survival of large trees for transplanting, because in the process of transporting loading and unloading, it is often easy to cause physiological water shortages, earth ball scattering, bark damage, etc. Try to shorten the loading and unloading time, and perform patience and meticulous work on the trees such as proper pruning, slow loading and unloading, steady support and timely spraying of water.
3. Before planting, trees should be planted in accordance with the growth habits of the trees, and good soil (including fertility, pH, etc.) should be changed. The general tree point specification is 2-3 times the earth ball.
4. Keep the trees upright and azimuthally correct when planting. (For transplanting, enter the pits according to the original growth direction of the trees. For example, if the direction of the misaligned trees is extended, the seedling period will be extended by about 7 days, and the survival rate will be about 20% lower.) Within the cavern, remove the packaging, fill the soil with layers, and plant trees should not be too deep and should be consistent with the original planting depth. The backfill soil shall be uniformly mixed with the organic fertilizer by using the transplanted tree in situ. Transplantation wood should set up support to prevent roots from shaking and affecting survival. IV. Maintenance and management of large trees after transplanting The regeneration ability of big trees is significantly less than that of young trees. The physiological function of trees is greatly reduced in a period of time after transplantation. Trees often lose water due to lack of water supply, causing water metabolism to evaporate and die. Therefore, maintaining the balance of water metabolism of the tree is the key to the maintenance and management of transplanted trees and the improvement of survival rate. To this end, we must do a good job in the following aspects:
(A) Part of the ground moisturizing:
1, lump dry: With straw rope, burlap, moss and other materials wrapped tightly around the trunk and relatively thick branches. The dressing has a certain degree of moisture retention and heat retention. After being treated with a wrapper, it can avoid strong direct sunlight and hot air blows, reduce water evaporation from trunks and branches, and can store a certain amount of water to keep the branches moist. Three adjustable trunk temperature, reduce the damage of high temperature and low temperature on the branches, the effect is better.
2. Water spray: The above-ground part of the tree, especially the leaf surface, is susceptible to water loss due to transpiration and must be sprayed with water in a timely manner. Spraying water is required to be fine and uniform, sprayed on all parts of the ground and surrounding space to provide a humid microclimate environment for the tree. High-pressure spray gun can be used, or the water supply pipe can be installed above the canopy, and one or more sprayers can be sprayed according to the size of the canopy. The effect is better, but it is more labor-intensive. Some people adopt the method of “suspending salt water†by hanging a number of salt water bottles filled with clean water on the branches and using the principle of hanging salt water to let the water in the bottles slowly drip on the trees and add water regularly. To save materials, but the water spray is not uniform enough, the water is difficult to control, generally used to crown transplanted trees, after the branches and leaves, still need to spray moisturizing.
3. Shading: In the early stage of transplanting large trees or in high-humidity and dry season, shady shades should be used to reduce the temperature in the shed to reduce the water evaporation of the trees. In the areas where plants are planted in rows, planted in large areas, and where the density is relatively high, it is advisable to build greenhouses, save the resources and facilitate management; solitary planting trees should be planted by plants. All shades of the crown are required to be kept at a distance of about 50 centimeters from the canopy above and around the arbours to ensure that there is a certain amount of air flow space in the shed to prevent the sunken hazard of the canopy; the degree of shading is about 70%, allowing the tree to accept a certain degree of Scatter light to ensure the photosynthesis of the tree. Later, depending on the growth of the trees and seasonal changes, shading nets were gradually removed.
(b) Promoting new roots:
1. Water control: The newly transplanted trees have a weakened water absorption function in their roots and a small amount of soil moisture. Therefore, just keep the soil moist. Excessive water content in the soil will affect the permeability of the soil, inhibit the respiration of the roots, and be detrimental to rooting. Severely, it will lead to the death of rot. To this end, on the one hand, we must strictly control the amount of water, the first watering when transplanting, and then depending on the weather conditions, soil texture, inspection and analysis, and careful watering, and at the same time be careful to prevent excessive spraying of water on the ground into the root zone On the other hand, to prevent stagnant water within the tree, leave watering holes when planting, after the first watering, it should be filled or slightly higher than the surrounding ground to prevent rain or water when watering. At the same time, in the low-lying and easily reces- sible areas, open drains to ensure timely drainage on rainy days so that the rain stops. In addition, it is necessary to maintain a suitable groundwater level (generally less than 1.5 meters). When the water table is high, it is necessary to drain the gutters. When the water level rises in the flood season, deep wells can be dug in the outer part of the root system, and the water pump can be used to drain the groundwater outside the site to prevent flooding.
2. Protecting New Teeth: The germination of new teeth is a sign of the new planting of trees for physiological activities and is a hope for the survival of a large tree. More importantly, the germination of the aerial part of the tree has a natural and effective stimulating effect on the root system and can promote the germination of the root system. Therefore, in the initial stage of transplantation, especially the teeth that are re-pruned during transplanting, the teeth that are sprouted must be protected, and then the branches should be pulled out. After the trees are survived, they are trimmed. At the same time, after germination of the tree, special efforts should be made to enhance water spray, shading, disease prevention, and pest control to ensure the normal growth of tender teeth and young shoots.
3. Soil aeration: Maintaining good air permeability in the soil is conducive to root germination. To this end, on the one hand, we must do a good job of cultivating loose soil and guard against soil compaction. On the other hand, inspecting the ventilation facilities (snorkels or bamboo cages) frequently and finding clogging or stagnant water should be promptly removed to maintain good ventilation performance.
(3) Other protective measures: Newly transplanted large trees, weakened resistance, vulnerable to natural disasters, pests and diseases, and human- and livestock-related hazards, must be strengthened to prevent, specifically to do the following several protection work.
1. Supporting and fixing: The tree attracts the wind and the tree should be supported and fixed after being planted. Beware of dumping. The positive triangle pile is most conducive to the stability of the tree, and the supporting point is preferably two-thirds of the height of the tree, and a protective layer is added to prevent damage to the bark.
2, disease prevention and control of insects: adhere to the main prevention, according to the characteristics of tree species and the occurrence and development of pests and diseases, ground inspection, in the event of illness, pests, to the right medicine, timely prevention and treatment.
3, fertilization: Fertilization is conducive to restore longevity, the early stages of transplanting trees, the ability of the root sucking fertilizer is low, should be used outside the root dressing, usually about half a month. With urea, ammonium sulfate, potassium dihydrogen phosphate and other readily available fertilizer made of 0.5% -1% concentration of fertilizer solution, the election leaves sooner or later for cloudy spraying, in case of rain should be re-spray once. After the roots germinate, the soil can be fertilized.
4. Antifreeze: Newly transplanted trees are vulnerable to low temperature and should be protected from frost and heat insulation, especially to the north of tropical and subtropical species. Therefore, on the one hand, after entering the fall, we must control nitrogenous fertilizers, increase phosphorus and potassium fertilizers, and gradually extend the illumination time, increase the light intensity, so as to increase the degree of lignification of the trees and roots, and improve their ability to resist cold. On the other hand, before the onset of the winter cold wave, measures such as covering the earth, covering the ground, setting up wind barriers, and building plastic sheds can be used for protection. The conservation methods and conservation priorities of newly transplanted trees are different due to their environmental conditions, seasons, climate, actual conditions of the trees, and different tree species. It is necessary for us to carry out continuous analysis and summary in practice. Land and trees are used flexibly to achieve the desired results.
Ziprasidone Intermediates
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Ziprasidone Intermediates
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