Large seedling cultivation technology

Large-scale seedlings refer to seedlings that have been cultivated in nurseries for several years to more than ten years. Under normal circumstances, it is cultivated in the nursery for 5 to 8 years. The use of large-scale seedlings in landscaping is mainly for the purpose of setting up the scene as soon as possible, to achieve the greening of the design, the intertwined greening effect of the flowers and branches, and to play the role of the tree to beautify and purify the environment as soon as possible. The large seedlings cultivated in the nursery have a developed and compact root system, a perfect tree shape, a strong growth potential, and a large tree body, which can better adapt to the environment of garden trees, such as parks, sidewalks, etc., planting After successful survival and growth.

The cultivation techniques of large seedlings are as follows:

The seedlings or vegetative breeding seedlings are excavated, the plant spacing is enlarged, and planted in the pre-designed nursery ground, so that the seedlings continue to grow and develop better. The operation method of the seedlings is called transplanting. Seedlings are called transplanted seedlings after transplantation. After transplanting the seedlings, the plant spacing is enlarged, the growth space is increased, the light and ventilation conditions are improved, the fertilizer and water management is enhanced, and the reasonable shaping and pruning is effectively promoted the growth of the seedlings and the development of good roots and trees. Shape, become a high quality seedling. At the same time, the process of transplantation is also a process of elimination, and those seedlings that are poorly grown, fail to meet requirements or are not expected to develop into high-quality seedlings are gradually eliminated.

1 The role of transplantation

1.1 Provide suitable living space for seedlings. For example, when seedlings are cultivated by seeding, cutting, grafting, etc., the density of seedlings is relatively large. After emergence, the individual seedlings grow gradually, and the individual seedlings gradually increase. Mutual influence, competition for water, fertilizer, light, air, etc., severely restrict the growth and development of seedlings, must expand the plant spacing of seedlings. The purpose can be achieved by means of seedling and transplantation. However, the seedlings will waste seedlings, and the seedlings left will not be able to cut their roots and promote their development. Therefore, the method of transplantation is often used to expand the row spacing of seedlings. That is to expand the living space, fully extend the root system, further expand the tree shape, fully allow the foliage to receive sunlight, enhance the photosynthesis and respiration of the seedlings, provide a good environment for the robust growth of the seedlings, and reduce the pests and diseases. Breeding; it is also convenient for daily management such as fertilization, watering, pruning, grafting.

1.2 When the roots of the developed seedlings are transplanted, the main root and part of the lateral roots are cut off, which can stimulate the roots to produce a large number of lateral roots and fibrous roots, promote root growth and development, increase the number of roots in the root system, enlarge the absorption area, form a well-developed root system, and improve seedling growth. the quality of. In addition, the transplanted seedlings are cut off from the main roots, and the roots are distributed in the shallow layer of the soil. The number of roots absorbed during the seedlings is large, which is conducive to the survival and growth of the green planting in the future, and achieves a good greening effect.

1.3 Cultivate the beautiful tree shape After transplanting, the tree seedlings with poor tree shape are eliminated. After transplanting, the growth space of the seedlings is expanded, and the branches of the seedlings are fully extended to form the tree shape inherent in the tree species. At the same time, after proper shaping and trimming, the tree shape is more suitable for landscaping needs. In addition, some tree species can be grafted to produce a special tree shape. For example, dragon claws are cultivated to produce a beautiful tree shape like an umbrella.

1.4 Reasonable use of land seedling growth In different periods, the size of the tree is different, and the demand for land area is different. Large seedlings for landscaping, at each age, according to the size of the seedlings, the growth characteristics of the tree species and the characteristics of the group, the density can be reasonably arranged, so that the land can be utilized to the maximum extent, and large-scale high-quality green seedlings can be cultivated as much as possible on a limited land. To maximize land benefits.

When transplanting seedlings, it is generally necessary to carry out hierarchical planting, and plant a batch of seedlings of uniform height and size into the same piece of land, which is conducive to the growth, tidy and balanced of the individual, and is also conducive to unified management.

2 transplant technology

2.1 Number of transplants The number of transplants should be determined according to the growth conditions of the seedlings and the specifications of the required seedlings. Generally, broad-leaved tree species are transplanted once a year for the first time, and transplanted every 2 to 3 years thereafter. The seedling age of 3 to 4 years has reached 5 to 8 years. Coniferous species, usually transplanted at the age of two years, and transplanted every 3 to 5 years later. The seedling age is 8 to 10 years.

2.2 Transplantation time Transplanting seedlings in the nursery is usually carried out before the germination of the trees in the spring, and after the growth of the seedlings in the autumn, sometimes in the rainy season.

2.2.1 Spring transplanting Spring soil thawing until tree germination is the appropriate time for seedling transplanting. After the spring soil is thawed, the buds of the trees have not yet sprouted and the roots have begun to move. After transplantation, the root system can be grown in advance to prepare for the absorption of the upper part of the water supply during the growing season. At the same time, before the soil is thawed, before the tree sprouts, the tree life activity is weak, the stored nutrients in the tree are not consumed a lot, and it is easy to survive after transplantation. Spring transplants should be arranged according to the germination of the trees sooner or later, early germinations are transplanted early, and late germinations are transplanted late. In some places, there is a dry and windy spring. If it is not possible to ensure adequate water supply after transplantation, the transplant time should be postponed or water conservation measures should be strengthened.

2.2.2 Autumn transplantation In the autumn, the growth of the aboveground part is slow or stop growing, that is, the deciduous tree begins to fall from the beginning to the end of the leaf; after the peak of the evergreen tree growth. At this time, the ground temperature is high, and the root system can still grow for a certain period of time. After transplantation, the root system can heal and grow new roots, ready for the growth of the coming year. The autumn transplant is generally warm and humid in autumn and warmer in winter. The northern winter is cold, and the autumn transplant should be early. Autumn transplants are not possible in areas with severe cold and severe freezing in winter.

2.2.3 Transplantation in the rainy season In the summer rainy season, it is mostly used for transplanting evergreen trees in the north and evergreen trees in the south. This season, there are many rains and humidity, the transpiration of seedlings is small, and the roots grow faster. Easy to live.

2.2.4 Winter Transplantation The southern part of the country is warmer in winter, the saplings grow slowly, and can be transplanted in winter; in the north, it can also be transplanted with hail.

2.3 Transplantation method In addition to reasonable arrangement of transplanting time, transplanting seedlings should also consider a series of tasks such as selection, density, land preparation, fertilization, seedling, seedling storage, planting and post-plant management.

Total 1 | <First <Prev 1 Next> Last> |
share to:


 Aluminium Alloy Drawn Tube 

 

1.Specification: Various size as customer's requirements
2.Material:A6000,A5000,A3000 series and other series alu alloy        
3.Suface treatment: anodizing ,polishing,turning ,power coating,mill finish etc
4.Design:OEM,ODM,or design by ourselves
5.Equipment: CNC ,extruding machine,cold drawn machine,heating oven,straigtening machine,cutting machine  

OD

OD Tolerance

ID Tolerance

Roundness

straightness

Circular   run-out

φ16-20

±0.02

±0.02

0.01↓

0.015↓

0.05↓

φ20-30

±0.02

±0.02

0.01↓

0.015↓

0.05↓

φ30-50

±0.05

±0.05

0.02↓

0.020↓

0.08↓

φ50-80

±0.15

±0.10

0.05↓

0.025↓

0.10↓


6.STANDARD PACKING: Wooden case/carton

7.OPTIONAL PACKING: Polyfoam  interleave inside, wooden case

 drawn tube workshop

Trade Terms
1. Payment: 30% T/T in advance, 70% balance pay before delivery.  L/C at sight.
2. Delivery time: 20 days after deposit receiverd. If opening mould, plus 7-10 days.
3. Trade Term can be chosen depending on your requirements.
4. FOB Port: Shanghai


Aluminum Alloy Drawn Tube

Aluminum Alloy Drawn Tube,Aluminum Alloy Cold Drawn Tube,Aluminium Alloy Cold Drawn Tube

Changzhou YiFei Machinery Co., Ltd. , https://www.yifeialu.com

This entry was posted in on