CN110547106A - Simple in-situ green branch cuttage method for Tilia miqueliana Maxim - Google Patents

Abstract

The invention discloses a simple local green branch cuttage method for Tilia miqueliana Maxim, which comprises the following steps: preparing a cutting bed, constructing a film-covered arched shed, constructing a shading shed frame, collecting and processing cutting slips, cutting, and managing after cutting. By the mode, the cutting facility and the operation link are simplified, the production cost is reduced, the on-site cutting can be realized, the later-period management and transplanting are not needed, the rooting rate of the cutting can reach 90%, the average rooting number of the cutting slips is more than 7, and the rapid propagation, the popularization and the application of rare plant Tilia miqueliana seedlings are facilitated.

Description

A simple in-situ green branch cutting method of Nanjing Tilia

technical field

The invention relates to the technical field of seedling propagation of woody plants, in particular to a simple in-situ green branch cutting method of Nanjing linden.

Background technique

Nanjing Tilia (Tilia miqueiana) is a tall deciduous tree belonging to Tiliaceae (Tiliaceae) Tilia L.. It is a unique species in my country. It is an excellent tree species with ornamental value, economic value and medicinal value. One of the new tree species for greening and landscaping, the demand for seedlings in the market is large. However, the habitat of Nanjing Tilia was destroyed due to human intervention, and the natural regeneration of the wild population was relatively poor, resulting in a continuous decrease in the population and individual numbers. In addition, Nanjing linden seeds have deep dormancy, and it generally takes 2-3 years to germinate under natural conditions, and natural reproduction is very difficult. These have affected the production of Nanjing linden seedlings and their popularization and application.

At present, the large-scale propagation of Nanjing Tilia is mainly based on seed propagation and cutting propagation. However, due to the different degree of seed plumpness and deep dormancy, the speed of sowing and propagation of Nanjing Tilia is seriously affected. Compared with this, cutting propagation can produce seedlings in the same year, and the propagation speed is relatively fast. There have been several research reports. For example, under the condition of full-illumination automatic intermittent spraying, the rooting survival rate of Nanjing Tilia green branch cuttings can reach about 80% (Shi Fenghou et al., Research on Nanjing Linden Twig Cutting Technology [J], Journal of Central South University of Forestry and Technology, 2017, 37 (8):6-10). Or use the facility-based cutting methods such as air-conditioning constant temperature control and LED lighting to obtain good cutting effects, the rooting rate can reach about 90%, and the transplanting survival rate can reach more than 95% (Shu Xiaochun, Tang Shijie, etc., a facility The method of cutting Nanjing linden, 2017102001356). However, these methods have stricter requirements on cutting facilities, and need to be carried out in glass greenhouses with automatic spraying, automatic sunshade and temperature control systems. At the same time, regular ventilation is required, and cutting pools and special substrates need to be disinfected; and under the conditions of full artificial control of light; after the cuttings take root and survive, they need to be moved to the field for hardening and cultivating seedlings. At this time, it is the high temperature season in summer, and the survival rate of transplanting is greatly affected by the high temperature climate. Both operation and daily management put forward high requirements, which also affect the actual effect of promotion and application to a certain extent.

Contents of the invention

The technical problem mainly solved by the present invention is to provide a simple in-situ green branch cutting method of Nanjing linden, which can achieve in-situ and efficient cutting without special management after cutting.

In order to solve the above-mentioned technical problems, a technical solution adopted by the present invention is: provide a kind of method for Nanjing linden simple and easy on-the-spot green branch cutting, comprising steps: (1) bed preparation: arrange the plots with loose topsoil into bed, use (2) build a film-covered shed: build a shed above the slotting bed, and cover the film on the shed; (3) build a shade shed: build a shade shed above the film-covered shed, The shading scaffold is covered with a sunshade net; (4) collection and processing of cuttings: from mid-April to early June, or from late August to early September, collect fresh shoots of the year from Nanjing Tilia plants as cuttings Strips, cut the cuttings from the base of the cuttings, tie them into bundles, and dip the base of the cuttings with a rooting agent; (5) Cutting: Use a stick to assist cuttings on the spot, insert the cuttings into the soil, and when cutting Compact the base of the cuttings, spray fungicides and insecticides, and then cover the film and the sunshade net in turn; (6) Management after cuttings: After 50 to 60 days of cuttings, remove the film, harden the seedlings for 1 to 2 weeks, and remove the sunshade net After that, it will be managed according to the conventional cultivation technical requirements of garden seedlings.

In a preferred embodiment of the present invention, in the step (1), the land of the plot is plowed, the soil is loosened and the soil block is broken to loosen the surface soil layer of the plot; the width of the slotting bed is 110-130cm , 10-20m in length; the slotting bed is in a north-south direction, and the bed surface is flat and flush with the ground.

In a preferred embodiment of the present invention, step (1) also includes punching the clay compacted in the topsoil layer of the slotting bed, and pouring sand into it for cutting; A good slotting bed should be watered thoroughly to make the soil fully absorb water and keep the topsoil moist.

In a preferred embodiment of the present invention, the skeleton material of the film-covered arch shed in step (2) is bamboo poles, bamboo slices, iron bars or fiberglass elastic rods; 40-50cm; the distance between the crossbars of the skeleton of the film-covered arch shed is 0.8-1m, and the longitudinal bars on the top of the film-covered arch shed are bound to the crossbars by iron wires or ropes.

In a preferred embodiment of the present invention, the skeleton material of the shade scaffold described in step (3) is bamboo pole, bamboo sheet, iron bar, fiberglass elastic rod or hollow iron pipe; The shading rate of described sunshade net is 70 %~85%.

In a preferred embodiment of the present invention, the shade scaffold described in step (3) has a width of 120-140 cm, a top height of 70-80 cm from the ground, and the distance between the shade scaffold and the top height of the film-covered arch Not less than 30cm.

In a preferred embodiment of the present invention, the shading scaffolding in step (3) includes a scaffolding with a ground height of 150-200 cm, and the shading area of the shading scaffolding is determined according to the floor area of the slotting bed, because The scaffolding is higher, which is convenient for subsequent operations.

In a preferred embodiment of the present invention, the cuttings collected from mid-April to early June in step (4) are taken from the twigs that sprout and grow on the upper side of annual branches, and the cuttings collected from late August to early September The strips are taken from the middle and upper twigs of the side branches of the current year; step (4) also includes immediately covering and moisturizing the collected cuttings before cutting the cuttings; the cut cuttings are 10-12cm long; The rooting agent is 100ppm indole acetic acid IBA, or a mixture of 50-100 ppm indole acetic acid IBA and 50 ppm α-naphthalene acetic acid NAA; soak in the rooting agent for 3-6 hours.

In a preferred embodiment of the present invention, in step (5), in-situ cuttings are selected around sunset or in the morning, when the light is weak; the diameter of the rod is 0.6-1.0 cm; 1/3-1/2 of the lower part of the cuttings Insert into the soil, the spacing between the plants is 8-10cm, and the row spacing is 15-20cm; when the cuttings are inserted into the soil, water should be added to the leaves of the cuttings in time.

In a preferred embodiment of the present invention, after the cutting is completed in step (6), no water will accumulate after rain.

The beneficial effects of the present invention are:

1. The cutting facilities are simple, the scaffolding is easy to build, the cost is low, and the links are simplified, the operation is convenient, and it is easy for ordinary seedling producers to master, which is conducive to production promotion and application;

2. After the cuttings are cut in situ, manual daily management is no longer needed in the later stage, which saves the trouble of daily watering management and saves labor and time;

3. Cutting directly on the spot does not require special preparation and filling of cutting substrates. After survival, transplanting is no longer required, which saves time and effort, and is also conducive to rooting and survival;

4. The cutting effect of green branches is good, the rooting rate of cuttings can reach about 90%, and the average number of roots is more than 7, which can be applied to the large-scale rapid propagation of Nanjing bass seedlings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Embodiment one:

Provide a kind of Nanjing linden simple in-situ green branch cutting method, including steps:

(1) Slotting bed preparation:

During winter and spring, select the plot to be cut, plow, loosen the soil, and level the land of the plot, and loosen the topsoil layer through freezing and thawing or alternately drying and wetting. Before the cuttings, the soil clods are further broken, and the plots are organized into a slotting bed with a width of 110-130 cm and a length of 10-20 m according to the north-south direction. The bed surface of the slotting bed is flat, and the bed surface is flush with the ground. For the clay that is compacted in the topsoil layer, use a drilling tool with a diameter of 2 to 4 cm. First, drill a hole on the prepared slotting bed with a depth of 8 to 10 cm. Fill the hole with moist river sand, vermiculite, and perlite, and use garden soil for direct cutting. As a control area, and then used for in situ cuttings. The day before the cutting, water the prepared cutting bed thoroughly to make the soil fully absorb water and keep the topsoil in a moist state.

(2) Construction of film-covered arch shed:

According to the width of the film used, bamboo poles are selected as the skeleton material of the arch shed, and a small arch shed with a width of 110-130 cm and a height of 40-50 cm above the ground is used to cover the film to maintain the air humidity in the film and prevent cuttings after cutting The leaves are shriveled and wilted. The distance between the crossbars of the small shed frame is 0.8-1m, and the top longitudinal rods are bound to the crossbars with wires or ropes to ensure the stability of the small film shed.

(3) Build a shade scaffolding:

Choose bamboo poles as the skeleton material of the shade scaffolding to build a shade scaffolding with a width of 120-140cm and a top height of 70-80cm from the ground. . The shade scaffolding is covered with a sunshade net, and the shading rate of the sunshade net should reach about 70% to 85%.

(4) Collection and processing of cuttings:

In the middle and late April of spring, from Nanjing Tilia plants that grow well and are free from diseases and insect pests, collect the twigs that sprout and grow from the upper buds of annual branches as cuttings. Immediately after the cuttings are cut, soak the base of the cuttings in a container filled with clear water or wet sand to keep them moist, and cover with a plastic film to prevent the leaves from wilting from dehydration. Cut the cuttings indoors or in a cool place. From the base of the cuttings, cut 10-12cm long, semi-lignified shoots as cuttings. Keep 1-2 complete leaves at the top of the cuttings. Cuttings are cut every 30-50 Tie them into a bundle, and soak the base of the cuttings in the rooting solution for 3-6 hours. The rooting agent is treated with a compound formula of 100ppm IBA and 50ppm NAA.

(5) cuttings:

Choose the time period around sunset and weak light for in-situ cuttings. Use a small stick with a diameter of 0.6-1.0 cm to make a small hole to assist in-situ cuttings. Insert the lower 1/3-1/2 of the cuttings into the soil, with a plant spacing of 8-10 cm and a row spacing of 15-20 cm. The leaves are facing the same direction and do not overlap each other. , Gently compact the base of the cuttings when cutting. While inserting the cuttings in situ, use a sprayer or shower to replenish water in time to keep the leaves moist without losing water. After all the cuttings in each cutting bed are completed, immediately spray the cutting leaves with 600-1000 times of carbendazim. After the cutting is completed, put it into a temperature and humidity recorder with an external probe, and cover it with film and sunshade net in turn, and fix it around with bricks, soil or river sand to prevent it from being blown up by the wind.

(6) Management after cutting

After the cuttings are completed, pay attention to ensure that there is no water accumulation after rain, and no special management is required in other aspects. After 50-60 days of cutting, both ends of the film and the whole film were uncovered successively, the seedlings were hardened for 1-2 weeks, and then the sunshade net was removed, and then managed according to the conventional cultivation technical requirements of garden seedlings.

After 65 days of cutting, the effects of different substrates and different rooting agents on cutting rooting were investigated. The result is that after the compound rooting treatment of 100ppmIBA+50ppmNAA, the average rooting rate of the cuttings is 92.86% in the perforated and irrigated sand area, 71.43% in the perlite area, 64.29% in the vermiculite area, and 85.71% in the garden soil control area. In addition, after being treated with 100ppm IBA, the average rooting rates of the hole-irrigating sand treatment area and direct cuttings were 70% and 76.67% respectively; % and 56.67%. , indicating that in Nanjing linden on-site green branch cutting seedlings, except for the plots with compacted topsoil, it is generally not necessary to drill holes to irrigate river sand and other matrix materials, and direct on-site cuttings can also obtain good cutting effects.

Embodiment two:

Provide a kind of Nanjing linden simple in-situ green branch cutting method, including steps:

(1) Slotting bed preparation:

During winter and spring, select the plot to be cut, plow, loosen the soil, and level the land of the plot, and loosen the topsoil layer through freezing and thawing or alternately drying and wetting. Before the cutting, the soil clods are further broken, and the land is organized into a slotting bed with a width of 110-130 cm and a length of 10-20 m according to the north-south direction. For the clay that is compacted in the topsoil layer, use a punching tool with a diameter of 2 to 4 cm to punch a hole in the prepared slotting bed with a depth of 8 to 10 cm, and then pour it into moist river sand for cuttings. The day before the cutting, water the prepared cutting bed thoroughly to make the soil fully absorb water and keep the topsoil in a moist state.

(2) Construction of film-covered arch shed:

According to the width of the film used, fiberglass elastic rods are selected as the skeleton material of the shed, and a small shed with a width of 110-130 cm and a height of 40-50 cm from the ground is built to cover the film to maintain the air humidity in the film and prevent the leaves from drying out. wilting. The distance between the crossbars of the small shed frame is 0.8-1m, and the top longitudinal rods are bound to the crossbars with wires or ropes to ensure the stability of the small film shed.

(3) Build a shade scaffolding:

Hollow iron pipes with a diameter of 2 to 2.5 cm are selected as the skeleton material of the shade scaffold to build a shade scaffold with a height of 150 to 160 cm from the ground, and the area is the same as that of the slotting bed. The shade scaffolding is covered with a sunshade net, and the shading rate of the sunshade net should reach about 70% to 85%.

(4) Collection and processing of cuttings:

In early June, from Nanjing Tilia plants that grow well and are free from diseases and insect pests, collect young shoots of the current year as cuttings. Immediately after the cuttings are cut, soak the base of the cuttings in a container filled with clear water or wet sand to keep them moist, and cover with a plastic film to prevent the leaves from wilting from dehydration. Cut the cuttings indoors or in a cool place. From the base of the cuttings, cut 10-12cm long, semi-lignified shoots as cuttings. Keep 1-2 complete leaves at the top of the cuttings. Cuttings are cut every 30-50 Tie into a bundle, and soak the base of the cuttings in a suitable rooting solution for 3-6 hours.

(5) cuttings:

Choose the time period around sunset and weak light for in-situ cuttings. Use a small stick with a diameter of 0.6-1.0 cm to make a small hole to assist in-situ cuttings. Insert the lower 1/3-1/2 of the cuttings into the soil, with a plant spacing of 8-10 cm and a row spacing of 15-20 cm. The leaves are facing the same direction and do not overlap each other. , Gently compact the base of the cuttings when cutting. While inserting the cuttings in situ, use a sprayer or shower to replenish water in time to keep the leaves moist without losing water. After all the cuttings in each slotting bed are completed, the cutting leaves are sprayed with 600-1000 times of carbendazim and 1000-2000 times of insecticide mixture immediately. After the cutting is completed, put it into a temperature and humidity recorder with an external probe, and cover it with film and sunshade net in turn, and fix it around with bricks, soil or river sand to prevent it from being blown up by the wind.

(6) Management after cutting

After the cuttings are completed, pay attention to ensure that there is no water accumulation after rain, and no special management is required in other aspects. After 50-60 days of cutting, both ends of the film and the whole film were uncovered successively, the seedlings were hardened for 1-2 weeks, and then the sunshade net was removed, and then managed according to the conventional cultivation technical requirements of garden seedlings.

After 55 days of cutting, both ends of the film were uncovered and domesticated for 2 days, and then all the film was removed to investigate the cutting effect of different rooting agents. The results show that the average rooting rate of 100ppm IBA alone is 73.33%, and the highest reaches 90%; the average rooting rate of 50ppm NAA and 50ppm IBA mixed treatment is 80%, and the highest is 90%, while the rooting rate with 100ppm ABT The average rooting rate of agent treatment is 70%, the highest is 80%. Therefore, combining the cutting effects of Examples 1 and 2, in Nanjing Tilia spring green branch cutting seedlings, using 100ppm IBA alone or 50-100ppm IBA+50ppmNAA composite treatment can significantly improve the rooting survival rate of cuttings, and the cutting effect is even excellent. In ABT rooting agent.

Embodiment three:

Provide a kind of Nanjing linden simple in-situ green branch cutting method, including steps:

(1) Slotting bed preparation:

During winter and spring, select the plot to be cut, plow, loosen the soil, and level the land of the plot, and loosen the topsoil layer through freezing and thawing or alternately drying and wetting. Before the cutting, the soil clods are further broken, and the land is organized into a slotting bed with a width of 110-130 cm and a length of 10-20 m according to the north-south direction. For the clay that is compacted in the topsoil layer, use a punching tool with a diameter of 2 to 4 cm to punch a hole in the prepared slotting bed with a depth of 8 to 10 cm, and then pour it into moist river sand for cuttings. The day before the cutting, water the prepared cutting bed thoroughly to make the soil fully absorb water and keep the topsoil in a moist state.

(2) Construction of film-covered arch shed:

According to the width of the film used, fiberglass elastic rods are selected as the skeleton material of the shed, and a small shed with a width of 110-130 cm and a height of 40-50 cm from the ground is built to cover the film to maintain the air humidity in the film and prevent the leaves from drying out. wilting. The distance between the crossbars of the small shed frame is 0.8-1m, and the top longitudinal rods are bound to the crossbars with wires or ropes to ensure the stability of the small film shed.

(3) Build a shade scaffolding:

Hollow iron pipes with a diameter of 2 to 2.5 cm are selected as the skeleton material of the shade scaffold to build a shade scaffold with a height of 150 to 160 cm from the ground, and the area is the same as that of the slotting bed. The shade scaffolding is covered with a sunshade net, and the shading rate of the sunshade net should reach about 70% to 85%.

(4) Collection and processing of cuttings:

In the first ten days of June, from Nanjing Tilia plants that grow well and are free from diseases and insect pests, collect the twigs that sprout and grow from the upper side of the annual branches as cuttings. Immediately after the cuttings are cut, soak the base of the cuttings in a container filled with clear water or wet sand to keep them moist, and cover with a plastic film to prevent the leaves from wilting from dehydration. Cut the cuttings indoors or in a cool place. From the base of the cuttings, cut 10-12cm long, semi-lignified shoots as cuttings. Keep 1-2 complete leaves at the top of the cuttings. Cuttings are cut every 30-50 Tie them into a bundle, and soak the base of the cuttings in the rooting solution for 3-6 hours. The rooting agent is preferably treated with 100ppm IBA alone, or combined with 50ppm IBA and 50ppm NAA.

(5) cuttings:

Choose the time period around sunset or in the morning when the light is weak for in-situ cuttings. Use a small stick with a diameter of 0.6-1.0 cm to make a small hole to assist in-situ cuttings. Insert the lower 1/3-1/2 of the cuttings into the soil, with a plant spacing of 8-10 cm and a row spacing of 15-20 cm. The leaves are facing the same direction and do not overlap each other. , Gently compact the base of the cuttings when cutting. While inserting the cuttings in situ, use a sprayer or shower to replenish water in time to keep the leaves moist without losing water. After all the cuttings in each slotting bed are completed, the cutting leaves are sprayed with 600-1000 times of carbendazim and 1000-2000 times of insecticide mixture immediately. After the cutting is completed, put it into a temperature and humidity recorder with an external probe, and cover it with film and sunshade net in turn, and fix it around with bricks, soil or river sand to prevent it from being blown up by the wind.

(6) Management after cutting

After the cuttings are completed, pay attention to ensure that there is no water accumulation after rain, and no special management is required in other aspects. After 50-60 days of cutting, both ends of the film and the whole film were uncovered successively, the seedlings were hardened for 1-2 weeks, and then the sunshade net was removed, and then managed according to the conventional cultivation technical requirements of garden seedlings.

After cutting for 55 days, both ends of the film were uncovered and acclimatized for 2 days, and then all the film was removed to investigate the effect of different leaf retention treatments on cutting rooting. The result is that the average rooting rate of leaving 2 leaves at the top of the cuttings is 83.33%, and the highest is 90%; while the average rooting rate of leaving 1 leaf is 56.67%, and the highest rooting rate is 70%. Therefore, in Nanjing Tilia green branch cutting seedlings, it is necessary to determine the appropriate number of leaves according to the size of the leaves of the twigs. When the leaf shape is small, it is advisable to leave 2 leaves at the top of the cuttings; when the leaf shape is large, leave 1 leaf. Appropriately, keeping leaves properly is beneficial to improve the rooting survival rate of cuttings.

The invention simplifies the cutting facilities and operation links, reduces the production cost, can cut on the spot, and no longer needs post-management and transplanting, the rooting rate of cuttings can be as high as 90%, and the average rooting number of cuttings is more than 7, which is beneficial to rare plants Rapid propagation and popularization of Nanjing Tilia seedlings. The invention can not only stably obtain a higher rooting survival rate of cuttings, but also has low requirements on cutting facilities, environmental control, etc., simplifies the operation links, reduces production costs, and is easy to be accepted, learned and applied by ordinary seedling producers.

The above descriptions are only examples of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description of the present invention, or directly or indirectly used in other related technical fields, shall be The same reasoning is included in the patent protection scope of the present invention.

Claims (10)

1. a Nanjing linden simple and easy on-the-spot green branch cutting method, is characterized in that, comprises the steps and is: (1) inserting bed preparation: arrange the plot with loose topsoil layer into inserting bed, be used for on-the-spot cutting; (2) construct cover Membrane shed: build a shed above the slotting bed, and cover the shed with a film; (3) build a shade shed: build a shade shed above the film-covered shed, and cover the shade shed with a sunshade (4) collection and processing of cuttings: from mid-April to early June, or from late August to early September, collect the young shoots of the current year from Nanjing Tilia plants as cuttings, and cut them from the base of the cuttings. Take the cuttings, tie them into bundles, and soak the base of the cuttings with a rooting agent; (5) Cutting: Use a rod to assist cuttings on the spot, insert the cuttings into the soil, compact the base of the cuttings during cutting, and spray to kill (6) Management after cutting: 50 to 60 days after cutting, remove the film, harden the seedlings for 1 to 2 weeks, remove the sunshade net, and then follow the conventional cultivation technical requirements for garden seedlings to manage. 2. the simple and easy in situ green branch cutting method of Nanjing linden according to claim 1, is characterized in that, in the step (1), the land of plot is turned over, loose soil and smashes soil clod, makes described plot The topsoil layer is loose; the slotting bed has a width of 110-130 cm and a length of 10-20 m; the slotting bed runs north-south, and the bed surface is flat and flush with the ground. 3. Nanjing linden according to claim 1 is simple and easy in situ green branch cutting method, it is characterized in that, in step (1), also comprise that the clay that bed topsoil layer is compacted is carried out perforating, pour into behind the sand and be used for cutting; Step (1) It also includes watering the prepared cutting bed thoroughly before cutting on the spot, so that the soil can fully absorb water and keep the topsoil in a moist state. 4. the simple and easy in situ green branch cutting method of Nanjing linden according to claim 1, is characterized in that, the framework material of film-covered arch shed described in step (2) is bamboo pole, bamboo chip, iron bar or fiberglass elastic rod; The width of the shed is 110-130cm, and the top height is 40-50cm from the ground; the distance between the horizontal bars of the skeleton of the film-covered arch shed is 0.8-1m, and the longitudinal bars on the top of the film-covered arch shed are tied to the horizontal bars by iron wires or ropes. Certainly. 5. the simple and easy in-situ green branch cutting method of Nanjing linden according to claim 1, is characterized in that, the frame material of shade scaffolding described in step (3) is bamboo pole, bamboo chip, iron bar, fiberglass elastic rod or A hollow iron pipe; the shading rate of the sunshade net is 70% to 85%. 6. The simple in-situ green branch cutting method of Nanjing linden according to claim 1, characterized in that, the shade scaffold described in step (3) has a width of 120-140 cm and a top height of 70-80 cm from the ground. The distance between the shade scaffolding and the ceiling height of the film-covered arch is not less than 30cm. 7. The simple in-situ green branch cutting method of Nanjing linden according to claim 1, characterized in that the shading scaffolding in step (3) comprises a scaffolding whose height from the ground is 150-200cm, and the shading The shade area of the scaffolding is determined according to the area occupied by the slotting bed. 8. Nanjing linden simple and easy on-the-spot green branch cutting method according to claim 1, it is characterized in that, in the step (4), the cuttings collected in the middle of April to the first ten days of June are taken from the tender growth of the upper side buds of the annual branches. The cuttings collected from late August to early September are taken from the middle and upper twigs of the side branches of the year; step (4) also includes covering and moisturizing the collected cuttings immediately before cutting the cuttings The length of cut cuttings is 10-12cm; the rooting agent is 100ppm indole acetic acid IBA, or a mixture of 50-100ppm indole acetic acid IBA and 50ppm alpha-naphthalene acetic acid NAA; soaking in the rooting agent for 3-6h. 9. Nanjing linden simple and easy on-the-spot green branch cutting method according to claim 1, it is characterized in that, in the step (5), on-the-spot cutting selection selects before and after sunset or morning, when light is weak; The diameter of described rod is 0.6～ 1.0cm; 1/3-1/2 of the lower part of the cuttings is inserted into the soil, the spacing between the plants is 8-10cm, and the row spacing is 15-20cm; when the cuttings are inserted into the soil, water should be added to the leaves of the cuttings in time. 10. The simple in situ green branch cutting method of Nanjing linden according to claim 1, characterized in that, after the cutting is completed in step (6), no water will accumulate after rain.