Top grafting and seed changing method for annona squamosa

Abstract

The invention discloses an annona squamosa top grafting and seed changing method. The method comprises the following steps: (1) branch cutting: re-retracting an annona squamosa tree subjected to seed changing; (2) scion treatment: selecting an excellent seed tree, cutting scions, and reserving 3-4 buds for each scion; (3) grafting: the scions are grafted after being soaked in the scion soaking liquid, and 1-3 scions are grafted on each trunk; (4) management after grafting: after survival of grafting, reserving 3-4 lateral branches on each trunk, and carrying out topping and leaf picking treatment; performing bud carving treatment in May to June; (5) pesticide and fertilizer application: applying pesticide and fertilizer after grafting is completed; and then applying the pesticide fertilizer once again after the buds are notched in May to June. The invention provides an annona squamosa top grafting variety changing method which is simple to operate, low in cost, time-saving and labor-saving, and capable of improving the grafting affinity of disease-resistant varieties and improving the fruit quality.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural planting, and in particular to a method for high-grafting and replacing sugar apples. Background Art

[0002] Sugar apple (scientific name: Annona squamosa Linn.), Annonaceae, Annona genus. Originated from tropical America, it is now cultivated in tropical regions around the world, including Zhejiang, Taiwan, Fujian, Guangdong, Guangxi, Hainan and Yunnan in my country. The ecological environment in the introduction area is very different from that in the place of origin, which leads to a large gap in the quality and yield of sugar apple varieties, affecting the commerciality and market price of sugar apples and reducing the income of fruit farmers. High-grafting crown replacement is to achieve the purpose of transforming low-value plants into high-value plants by cutting off the main trunk of the plant and then grafting branches of excellent varieties. In this process, the treatment of excellent varieties of scions is of great significance to improve the survival rate of grafting, reduce grafting materials, improve work efficiency, and reduce costs. When performing high-grafting crown replacement, it is necessary to first select suitable scions. Usually, healthy and well-grown branches of local suitable excellent varieties are selected as scions, and then the scions are processed according to technical requirements for use. Select the tea tree that needs to be transformed, cut off its trunk, and leave a trunk of appropriate length (60-80 cm from the ground) as the bearing part of the scion. Insert the prepared scion into the trunk through cleft grafting, cut grafting, belly grafting and other methods, fix and protect it. After the scion grows and completely merges with the trunk, the remaining trunk can be removed to make the scion a new crown. In order to improve the economic benefits of sugar apple production, high grafting technology is used to improve sugar apple varieties and restore tree vigor, so as to achieve high and stable yields and realize the purpose of agricultural economic value.

[0003] Root rot is a serious disease of sugar apple, which affects the growth and yield of sugar apple. Custard apple rootstocks are usually made of common sugar apple trees, which have good affinity and the advantage of dwarfing the tree shape and early production period. However, common sugar apple trees are less resistant to root rot, while the varieties of mountain thorn, round and smooth, and ox heart pear are highly resistant to root rot and can be used as rootstocks. However, these two rootstocks are often not compatible with common sugar apples and other cultivated varieties, and the seedling rate is low. Even if the seedlings are established, the quality of the fruit is not high. Therefore, it is urgent to explore a method for high grafting of sugar apples to improve the affinity of disease-resistant varieties and improve the quality of fruit. Summary of the invention

[0004] In view of the above shortcomings, the present invention provides a method for high-grafting and replacing sugar apples, which is simple to operate, low in cost, saves time and effort, improves the grafting affinity of disease-resistant varieties, and improves the fruit quality. The specific technical scheme is as follows:

[0005] A method for high-grafting and replacing sugar apples, comprising:

[0006] (1) Pruning: In March, the replaced sugar apple trees were heavily pruned back, retaining 4 to 6 main trunks per tree. The height after pruning was controlled at 60-80 cm, and the remaining branches were cut off;

[0007] (2) Scion treatment: Select mother trees that are in their prime growth period, are strong, have high and stable yields, are free of pests and diseases, and have good quality. Cut the one-year-old mature outer branches in the middle and upper part of the crown as scions. After the scions are picked, cut off the leaves and retain 0.3-0.5 cm of petioles to reduce water evaporation. Leave 3-4 buds on each scion and cut them into 10-15 cm in length. Sterilize the scions, moisturize them, and store them in a cool place for later use;

[0008] (3) Grafting: Take the unused scion and soak it in the scion soaking liquid for 10 to 60 minutes before grafting. Each trunk is grafted with 1 to 3 scion. When grafting, the cut grafting method or the cleft grafting method is adopted, and the grafting site is wrapped with a film;

[0009] (4) Management after grafting: After the grafting is successful, leave 3 to 4 side branches on each main trunk; top and remove leaves when the plant grows to 50 to 60 cm in height, and top and remove leaves every 40 to 50 cm thereafter to promote the growth of the crown and the germination of new buds; when the spike grows to the same diameter as the main trunk, remove the film; perform bud cutting in May and June;

[0010] (5) Fertilizer application: Apply fertilizer after grafting is completed, 0.5-1 kg per mu; then apply fertilizer again after budding in May or June, 2-3 kg per mu.

[0011] Preferably, in step (1), the diameter of the trunk is 2 to 5 cm, and the distance between the cut of the trunk and the branch is 15 to 20 cm.

[0012] Preferably, in step (2), the diameter of the spike is 1 to 2 cm and the length is 10 to 15 cm.

[0013] Preferably, the scion is collected 5-10 days before grafting and is stored in an environment with a temperature of 10-16° C. and a humidity of 80-90% before dipping.

[0014] Preferably, the ear soaking solution comprises, by weight: 3-5 parts of rosin mixture, 1-3 parts of rooting powder, 0.01-0.03 parts of amino acid, 0.003-0.007 parts of GGR6, 0.001-0.005 parts of sodium nitrophenolate, and 100-150 parts of water.

[0015] Further preferably, the method for preparing the ear soaking liquid is: heating water to 40-45° C., dissolving the rosin mixture, adding rooting powder, amino acid, GGR6, and sodium nitrophenolate under constant stirring, and mixing evenly to obtain the ear soaking liquid.

[0016] Preferably, the composition of the medicinal fertilizer includes, by weight: 10 to 20 parts of white sugar, 20 to 30 parts of soybean bran, 5 to 10 parts of alfalfa, 0.5 to 1 part of boric acid, 10 to 15 parts of calcium magnesium fertilizer, 0.001 to 0.003 parts of carbendazim, 0.001 to 0.003 parts of acetamiprid, 0.001 to 0.003 parts of streptomycin, and 20 to 30 parts of water.

[0017] Preferably, the preparation method of the medicated fertilizer is: 1) adding white sugar, bean bran, alfalfa and water into a fermentation tank, and sealing and fermenting at room temperature for 3 to 5 days; 2) opening the lid and stirring after the fermentation is completed, and adding carbendazim, acetamiprid and streptomycin in sequence under continuous stirring; 3) continuing to stir for 1 to 2 hours, then adding boric acid and calcium magnesium fertilizer, and mixing evenly to obtain the medicated fertilizer.

[0018] Preferably, in step (2), the variety of the mother tree is a variety of sugar apple with high resistance to root rot, selected from one of the following: sugar apple, round and smooth.

[0019] Preferably, in step (4), the bud incision treatment is to make incisions on both sides above the bud at a distance of 0.5 to 1 cm from the bud, the depth of the incision reaches the woody part without damaging the bud, and the length of the incision is 1 / 3 to 1 / 2 of the circumference of the branch.

[0020] Preferably, the present invention further comprises spraying 0.1-0.5% Bordeaux liquid on the bud base after untying the film, with a spraying amount of 1-2 L / mu.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The high-grafting crown replacement method of the sugar apple of the present invention is simple to operate, low in cost, time-saving and labor-saving, and improves the grafting affinity of disease-resistant varieties and the fruit quality.

[0023] 2. In the grafting operation and post-grafting management of the present invention, the present invention will perform bud carving treatment 1 to 2 months after the grafting is successful. Bud carving on both sides can allow the crown to grow horizontally, expand the crown width, dwarf the tree, and advance the production period. Too deep or too long a carving may damage the bud or cause branch rot; too shallow or too short a carving may not achieve the effect of stimulating bud sprouting, change the distribution of nutrients and hormones around the bud, break the dormancy of the bud, stimulate bud germination, increase the number of branches, and thus improve the survival rate of the plant; the purpose of topping and leaf picking twice is to reduce the tree width, dwarf the plant, maintain the tree shape and promote flower bud differentiation.

[0024] 3. The present invention treats the spikelets with spikelet soaking liquid, which can make the stock and the spikelet produce callus tissue, quickly connect and differentiate into cambium and conducting tissue, so as to solve the problems that the healing process of the stock and the spikelet has a long period, poor resistance and easy infection of bacteria; soaking the spikelets in the spikelet soaking liquid can prevent water evaporation, and no sun protection, heat preservation, moisturizing and other measures are required during the grafting process, and there is no need to wait until it is cloudy and rainless for grafting, and the grafting conditions have no time or weather requirements; the seedling rate is improved, and the grafting site is prevented from being infected by root nodule bacteria; and the affinity between the trunk and the spikelet is improved.

[0025] 4. The drug fertilizer of the present invention can assist in improving the resistance and affinity of the grafted plants. When used in combination with the ear dipping solution, there is no need for subsequent sterilization and disinfection operations, which saves the amount of drugs used and the cost, thereby improving the survival rate and the quality of the fruit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a grafting treatment diagram of the present invention. DETAILED DESCRIPTION

[0028] The specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments. Unless otherwise defined, all professional terms used hereinafter have the same meaning as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present invention. Unless otherwise specifically stated, various raw materials, reagents, instruments and equipment used in the present invention, etc. can be purchased from the market or can be prepared by existing methods.

[0029] As an example, the GGR6 and sodium nitrate complex are produced by Beijing Abidi Biotechnology Co., Ltd., but the present invention is not limited thereto.

[0030] As an example, the planting site is located in Longzhou County, Chongzuo City, but the present invention is not limited thereto.

[0031] Example 1

[0032] The variety of the spike mother tree of the present embodiment is Tripterygium wilfordii.

[0033] A method for high grafting and replacing sugar apples of this embodiment includes:

[0034] (1) Pruning: In March, the replaced sugar apple trees were re-pruned, retaining 5 main trunks per tree, with a trunk diameter of 3 cm and the trunk cut 18 cm away from the branch. After pruning, the height was controlled at 70 cm, and the remaining branches were cut off;

[0035] (2) Scion treatment: Select mother trees that are in the prime of growth, strong, high-yielding and stable, free of pests and diseases, and of good quality, and cut one-year-old mature outer branches in the middle and upper part of the crown as scions. Leave three buds on each scion. The diameter of the scion is 1.5 cm and the length is 12 cm. After the scion is picked, the leaves are cut off, and the petiole of 0.4 cm is retained to reduce water evaporation. The scion is collected 7 days before grafting and stored in an environment with a temperature of 13°C and a humidity of 85% for later use;

[0036] (3) Grafting: Take the unused scion and soak it in the scion soaking solution for 30 minutes before grafting. Two scion are grafted on each trunk. When grafting, the cut grafting method is adopted and the grafting site is wrapped with a film. The scion soaking solution includes, by weight: 4 parts of rosin mixture, 2 parts of rooting powder, 0.02 parts of amino acid, 0.005 parts of GGR6, 0.003 parts of sodium nitrophenolate and 120 parts of water. The preparation method of the scion soaking solution is as follows: heat water to 42°C to dissolve the rosin mixture, add the rooting powder, amino acid, GGR6 and sodium nitrophenolate under continuous stirring, and mix well to obtain the scion soaking solution.

[0037] (4) Management after grafting: After the grafting is successful, leave three side branches on each main trunk; top and remove leaves when the plant grows to 55 cm, and then top and remove leaves every 45 cm to promote the growth of the crown and the germination of new buds; when the spike grows to the same diameter as the main trunk, remove the film; in May, perform bud carving, and make a cut on both sides above the bud 0.8 cm away from the bud. The depth of the cut reaches the woody part without damaging the bud. The length of the cut is 1 / 3 of the circumference of the branch;

[0038] (5) Fertilizer application: Fertilizer is applied after grafting is completed, at a rate of 0.8 kg per mu; thereafter, fertilizer is applied again after budding in May, at a rate of 2.5 kg per mu; the composition of the fertilizer includes, by weight, 15 parts of sugar, 25 parts of soybean bran, 7 parts of alfalfa, 0.8 parts of boric acid, 12 parts of calcium magnesium fertilizer, 0.002 parts of carboxymethyl, 0.002 parts of acetamiprid, 0.002 parts of streptomycin, and 25 parts of water; the preparation method of the fertilizer is as follows: 1) add sugar, soybean bran, alfalfa, and water into a fermentation tank, and seal and ferment at room temperature for 4 days; 2) open the lid and stir after fermentation is completed, and add carboxymethyl, acetamiprid, and streptomycin in sequence while stirring continuously; 3) continue stirring for 1 hour, then add boric acid and calcium magnesium fertilizer, and mix well to obtain the fertilizer.

[0039] Example 2

[0040] The variety of the spike mother tree of the present embodiment is smooth.

[0041] A method for high grafting and replacing sugar apples of this embodiment includes:

[0042] (1) Pruning: In March, the replaced sugar apple trees were re-pruned, retaining 5 main trunks per tree, with a trunk diameter of 3 cm and the trunk cut 18 cm away from the branch. After pruning, the height was controlled at 70 cm, and the remaining branches were cut off;

[0043] (2) Scion treatment: Select mother trees that are in the prime of growth, strong, high-yielding and stable, free of pests and diseases, and of good quality, and cut one-year-old mature outer branches in the middle and upper part of the crown as scions. Leave three buds on each scion. The diameter of the scion is 1.5 cm and the length is 12 cm. After the scion is picked, the leaves are cut off, and the petiole of 0.4 cm is retained to reduce water evaporation. The scion is collected 7 days before grafting and stored in an environment with a temperature of 13°C and a humidity of 85% for later use;

[0044] (3) Grafting: Take the unused scion and soak it in the scion soaking solution for 30 minutes before grafting. Two scion are grafted on each trunk. When grafting, the cut grafting method is adopted and the grafting site is wrapped with a film. The scion soaking solution includes, by weight: 4 parts of rosin mixture, 2 parts of rooting powder, 0.02 parts of amino acid, 0.005 parts of GGR6, 0.003 parts of sodium nitrophenolate and 120 parts of water. The preparation method of the scion soaking solution is as follows: heat water to 42°C to dissolve the rosin mixture, add the rooting powder, amino acid, GGR6 and sodium nitrophenolate under continuous stirring, and mix well to obtain the scion soaking solution.

[0045] (4) Management after grafting: After the grafting is successful, leave three side branches on each main trunk; top and remove leaves when the plant grows to 55 cm, and then top and remove leaves every 45 cm to promote the growth of the crown and the germination of new buds; when the spike grows to the same diameter as the main trunk, remove the film; in May, perform bud carving, and make a cut on both sides above the bud 0.8 cm away from the bud. The depth of the cut reaches the woody part without damaging the bud. The length of the cut is 1 / 3 of the circumference of the branch;

[0046] (5) Fertilizer application: Fertilizer is applied after grafting is completed, at a rate of 0.8 kg per mu; thereafter, fertilizer is applied again after budding in May, at a rate of 2.5 kg per mu; the composition of the fertilizer includes, by weight, 15 parts of sugar, 25 parts of soybean bran, 7 parts of alfalfa, 0.8 parts of boric acid, 12 parts of calcium magnesium fertilizer, 0.002 parts of carboxymethyl, 0.002 parts of acetamiprid, 0.002 parts of streptomycin, and 25 parts of water; the preparation method of the fertilizer is as follows: 1) add sugar, soybean bran, alfalfa, and water into a fermentation tank, and seal and ferment at room temperature for 4 days; 2) open the lid and stir after fermentation is completed, and add carboxymethyl, acetamiprid, and streptomycin in sequence while stirring continuously; 3) continue stirring for 1 hour, then add boric acid and calcium magnesium fertilizer, and mix well to obtain the fertilizer.

[0047] Example 3

[0048] The variety of the spike mother tree in this embodiment is Niuxinli.

[0049] A method for high grafting and replacing sugar apples of this embodiment includes:

[0050] (1) Pruning: In March, the replaced sugar apple trees were re-pruned, retaining 5 main trunks per tree, with a trunk diameter of 3 cm and the trunk cut 18 cm away from the branch. After pruning, the height was controlled at 70 cm, and the remaining branches were cut off;

[0051] (2) Scion treatment: Select mother trees that are in the prime of growth, strong, high-yielding and stable, free of pests and diseases, and of good quality, and cut one-year-old mature outer branches in the middle and upper part of the crown as scions. Leave three buds on each scion. The diameter of the scion is 1.5 cm and the length is 12 cm. After the scion is picked, the leaves are cut off, and the petiole of 0.4 cm is retained to reduce water evaporation. The scion is collected 7 days before grafting and stored in an environment with a temperature of 13°C and a humidity of 85% for later use;

[0052] (3) Grafting: Take the unused scion and soak it in the scion soaking solution for 30 minutes before grafting. Two scion are grafted on each trunk. When grafting, the cut grafting method is adopted and the grafting site is wrapped with a film. The scion soaking solution includes, by weight: 4 parts of rosin mixture, 2 parts of rooting powder, 0.02 parts of amino acid, 0.005 parts of GGR6, 0.003 parts of sodium nitrophenolate and 120 parts of water. The preparation method of the scion soaking solution is as follows: heat water to 42°C to dissolve the rosin mixture, add the rooting powder, amino acid, GGR6 and sodium nitrophenolate under continuous stirring, and mix well to obtain the scion soaking solution.

[0053] (4) Management after grafting: After the grafting is successful, leave three side branches on each main trunk; top and remove leaves when the plant grows to 55 cm, and then top and remove leaves every 45 cm to promote the growth of the crown and the germination of new buds; when the spike grows to the same diameter as the main trunk, remove the film; in May, perform bud carving, and make a cut on both sides above the bud 0.8 cm away from the bud. The depth of the cut reaches the woody part without damaging the bud. The length of the cut is 1 / 3 of the circumference of the branch;

[0054] (5) Fertilizer application: Fertilizer is applied after grafting is completed, at a rate of 0.8 kg per mu; thereafter, fertilizer is applied again after budding in May, at a rate of 2.5 kg per mu; the composition of the fertilizer includes, by weight, 15 parts of sugar, 25 parts of soybean bran, 7 parts of alfalfa, 0.8 parts of boric acid, 12 parts of calcium magnesium fertilizer, 0.002 parts of carboxymethyl, 0.002 parts of acetamiprid, 0.002 parts of streptomycin, and 25 parts of water; the preparation method of the fertilizer is as follows: 1) add sugar, soybean bran, alfalfa, and water into a fermentation tank, and seal and ferment at room temperature for 4 days; 2) open the lid and stir after fermentation is completed, and add carboxymethyl, acetamiprid, and streptomycin in sequence while stirring continuously; 3) continue stirring for 1 hour, then add boric acid and calcium magnesium fertilizer, and mix well to obtain the fertilizer.

[0055] Comparative Example 1: This comparative example is different from Example 1 in that no ear soaking liquid is used to soak the ear strips, and the remaining operations are the same as Example 1.

[0056] Comparative Example 2: This comparative example is different from Example 1 in that the ear soaking liquid is replaced with a 1000-1500 times solution of Trichoderma harzianum, and the remaining operations are the same as Example 1.

[0057] Comparative Example 3: The difference between this comparative example and Example 1 is that the drug fertilizer is replaced with commercially available nitrogen, phosphorus and potassium fertilizers, the application amount is 0.8 kg / mu, and after the grafting is completed, 800-1000 times of thiophanate methyl is used to spray the whole tree for sterilization, and the rest of the operations are the same as Example 1.

[0058] Comparative Example 4: This comparative example differs from Example 1 in that no bud incision treatment is performed, and the remaining operations are the same as those in Example 1.

[0059] Comparative Example 5: This comparative example is a common grafting method, including:

[0060] (1) Pruning: In March, the replaced sugar apple trees were re-pruned, retaining 5 main trunks per tree, with a trunk diameter of 3 cm and a trunk cut 18 cm from the branch. After pruning, the height was controlled at 70 cm, and the remaining branches were cut off;

[0061] (2) Scion treatment: Select mother trees that are in their prime growth period, are strong, have high and stable yields, are free of pests and diseases, and have good quality. Cut one-year-old mature outer branches in the middle and upper part of the crown as scions. Leave 3-4 buds on each scion. The diameter of the scion is 1.5 cm and the length is 12 cm. After the scion is picked, all the leaves are cut off and the grafting is carried out directly;

[0062] (3) Grafting: Two spikes are grafted onto each trunk. Cut grafting is used and the grafting site is wrapped with a film.

[0063] (4) Management after grafting: After the grafting is successful, the top and leaves are removed when the plant height reaches 55 cm; when the spike grows to the same diameter as the trunk, the film is removed.

[0064] The data of the above Examples 1 to 3 and Comparative Examples 1 to 4 are recorded in the following Table 1:

[0065] Table 1

[0066] Seedling rate (%) Fruit cracking rate (%) Soluble solids Single fruit weight (g) Root rot incidence (%) Example 1 97.3 5.2 23.5 564.2 2.0 Example 2 96.8 5.6 25.2 562.8 2.3 Example 3 95.6 4.9 24.9 567.0 1.8 Comparative Example 1 78.1 20.8 19.2 540.7 19.7 Comparative Example 2 87.5 15.2 21.0 552.9 10.0 Comparative Example 3 84.6 16.4 22.5 550.4 10.9 Comparative Example 4 79.5 5.6 20.1 552.8 18.6 Comparative Example 5 72.0 24.9 18.0 536.9 21.3

[0067] In summary, the high-grafting and crown-changing method of sugar apple of the present invention is simple to operate, low in cost, time-saving and labor-saving, improves the grafting affinity of disease-resistant varieties, and improves the fruit quality; in the grafting operation and post-grafting management of the present invention, the present invention will perform bud carving treatment 1 to 2 months after the grafting is successful. The bud carving on both sides can allow the crown to grow horizontally, expand the crown width, dwarf the tree, and advance the production period. The carving is too deep or too long, which may damage the bud or cause branch rot; the carving is too shallow or too short, which may not achieve the effect of stimulating bud sprouting, changes the distribution of nutrients and hormones around the bud, breaks the dormant state of the bud, stimulates the bud to germinate, increases the number of branches, and thus improves the survival rate of the plant; the purpose of performing topping and leaf picking twice is to reduce the tree width, dwarf the plant, maintain the tree shape and promote flower bud differentiation. The present invention treats the fringe strips with fringe liquid to allow the stock and fringe strips to produce callus tissue, quickly connect and differentiate into cambium and conducting tissue, solve the problems that the healing process of the stock and fringe strips has the characteristics of long cycle, poor resistance, and easy infection of pathogens; soaking the fringe strips with fringe liquid can prevent water evaporation, and no sun protection, heat preservation, moisturizing and other measures are required during the grafting process, and there is no need to wait until cloudy days without rain for grafting, and there is no time or weather requirement for grafting conditions; improve the seedling rate, prevent the grafting port from being infected by root nodule bacteria; improve the affinity of the trunk and fringe strips. The drug fertilizer of the present invention can assist in improving the resistance and affinity of the grafted plants, and no subsequent sterilization and disinfection operations are required when combined with the fringe liquid for treatment, saving the amount of medicine, saving costs, thereby improving the survival rate and improving the quality of the fruit.

[0068] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A method for high grafting of sugar apple, characterized in that: include: (1) Pruning: In March, the replaced sugar apple trees were heavily pruned back, retaining 4 to 6 main trunks per tree. The height after pruning was controlled at 60-80 cm, and the remaining branches were cut off; (2) Scion treatment: Select mother trees that are in their prime growth period, are strong, have high and stable yields, are free of pests and diseases, and have good quality. Cut the one-year-old mature outer branches in the middle and upper part of the crown as scions. After the scions are picked, cut off the leaves, leaving 0.3-0.5 cm petioles, and leave 3-4 buds on each scion for later use; (3) Grafting: Take the ear cuttings to be used, soak them in ear soaking liquid and then graft them, grafting 1 to 3 ear cuttings per trunk; (4) Management after grafting: After the grafting is successful, leave 3 to 4 side branches on each main trunk; top and remove leaves when the plant grows to 50 to 60 cm, and top and remove leaves every 40 to 50 cm thereafter; remove the film when the spike grows to the same diameter as the main trunk; perform bud cutting in May and June; (5) Fertilizer application: Apply fertilizer after grafting is completed, 0.5-1 kg per mu; then apply fertilizer again after budding in May or June, 2-3 kg per mu.

2. The method for high grafting of sugar apple according to claim 1, characterized in that: In the step (1), the diameter of the trunk is 2 to 5 cm, and the distance between the cut of the trunk and the branch is 15 to 20 cm.

3. The method for high grafting of sugar apple according to claim 1, characterized in that: In the step (2), the diameter of the spike is 1 to 2 cm and the length is 10 to 15 cm.

4. The method for high grafting of sugar apple according to claim 1, characterized in that: The scion is collected 5-10 days before grafting and is stored in an environment with a temperature of 10-16° C. and a humidity of 80-90% before dipping.

5. The method for high grafting of sugar apple according to claim 1, characterized in that: The ear soaking solution comprises, by weight: 3-5 parts of rosin mixture, 1-3 parts of rooting powder, 0.01-0.03 parts of amino acid, 0.003-0.007 parts of GGR6, 0.001-0.003 parts of sodium nitrophenolate and 100-150 parts of water.

6. The method for high grafting of sugar apple according to claim 1, characterized in that: The composition of the medicinal fertilizer includes, by weight, 10 to 20 parts of white sugar, 20 to 30 parts of bean bran, 5 to 10 parts of alfalfa, 0.5 to 1 part of boric acid, 10 to 15 parts of calcium magnesium fertilizer, 0.001 to 0.003 parts of metalaxyl, 0.001 to 0.003 parts of acetamiprid, 0.001 to 0.003 parts of streptomycin, and 20 to 30 parts of water.

7. The method for high grafting of sugar apple according to claim 6, characterized in that: The preparation method of the medicinal fertilizer is as follows: 1) adding white sugar, bean bran, alfalfa and water into a fermentation tank, and sealing and fermenting at room temperature for 3 to 5 days; 2) opening the cover and stirring after the fermentation is completed, and adding carbendazim, acetamiprid and streptomycin in sequence under continuous stirring; 3) continuing to stir for 1 to 2 hours, and then adding boric acid and calcium magnesium fertilizer, and mixing evenly to obtain the medicinal fertilizer.

8. The method for high grafting of sugar apple according to claim 1, characterized in that: In the step (2), the variety of the mother tree is a variety of sugar apple with high resistance to root rot, selected from one of the following: mountain thorn, round and smooth.

9. The method for high grafting of sugar apple according to claim 1, characterized in that: In the step (4), the bud incision treatment is to make incisions on both sides above the bud at a distance of 0.5 to 1 cm from the bud, and the length of the incision is 1 / 3 to 1 / 2 of the circumference of the branch.

10. The method for high grafting of sugar apple according to claim 1, characterized in that: It also includes spraying 0.1-0.5% Bordeaux liquid on the bud base after untying the film, with a spraying amount of 1-2L / mu.

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