Method and application of high-grafting astringent persimmon to produce two fruits on one tree without changing the planting method of sweet persimmon in Taiqiu

Abstract

The present invention provides a method and application for grafting astringent persimmons onto Taiqiu sweet persimmons, achieving dual fruit production on one tree without replanting. Using this method, astringent persimmons can be grafted onto Taiqiu sweet persimmons, achieving high-efficiency production of two fruits per tree. The astringent persimmons remain in the upper canopy, where they hang abundantly in bright red for tourists to admire and photograph in winter. The lower canopy produces high-value Taiqiu sweet persimmons for sale to tourists. Because Taiqiu sweet persimmons command a much higher price than astringent persimmons, they can be eaten directly from the tree, providing an immersive experience for tourists while also increasing farmers' income. Fruiting begins two years after grafting, and the yield per tree reaches 25 kilograms (market price 40 yuan / kg) in five years, increasing annual profits by approximately 1,000 yuan per tree.

Description

Technical Field

[0001] The invention relates to the technical field of high grafting of persimmon trees, and in particular to a method for high grafting of persimmon trees without changing the planting method and application thereof. Background Art

[0002] Currently cultivated persimmons are mainly divided into astringent and sweet persimmons. Astringent persimmons do not lose their astringency on the tree. When first picked, they are astringent and cannot be eaten directly. They need to lose their astringency before they can be eaten. They are not popular with fast-paced consumers and are rarely picked. In winter, the bright red persimmons hanging on the trees create a beautiful sight. Sweet persimmons lose their astringency on the tree and can be eaten right after being picked. They are sweet and crisp, and are very popular with consumers.

[0003] In order to increase the income of fruit farmers and maintain the beautiful sight of persimmons hanging in the winter, a method of grafting astringent persimmons with sweet persimmons without having to plant two fruits on one tree is urgently needed. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of astringent persimmons, such as low price and high crown, which make harvesting difficult, and to provide a method and application of high-grafting persimmon trees to achieve two fruits on one tree without changing the tree.

[0005] The technical solution adopted by the present invention is as follows: The first aspect of the present invention provides a method for high-grafting astringent persimmons into sweet persimmons without changing the planting process to produce two fruits on one tree, comprising the following steps:

[0006] S1: Prepare astringent persimmon rootstock and select suitable Taiqiu sweet persimmon scion;

[0007] S2: Grafting Taiqiu sweet persimmon onto astringent persimmon: Select a grafting site 1m-1.5m above the ground on the main trunk of the astringent persimmon and directly graft the Taiqiu sweet persimmon on the belly. Alternatively, ring-bark the main trunk 1m-1.5m above the ground to induce latent bud germination of the rootstock. After lignification, graft the Taiqiu sweet persimmon on the belly or insert the bud. This will produce astringent persimmon fruits on the upper crown and Taiqiu sweet persimmon fruits on the lower crown.

[0008] Wherein, the belly-joining comprises the following steps:

[0009] (1) Cutting the rootstock: Choose a straight part of the trunk 1m-1.5m above the ground, and cut straight from top to bottom with a knife. The cut should be as deep as the cambium layer and 1.8-2.2cm long. Leave 0.8-1.2cm of phloem and remove the excess phloem.

[0010] (2) Cutting the scion: Make a diagonal cut at an angle of 25-35° 1.5-2.0 cm below one side of the bud to form a horse-ear-shaped incision; then, make a straight cut 0.2-0.4 cm below the bud on the other side of the bud to form a straight incision. The depth of the straight incision should reach the cambium layer and just intersect with the horse-ear-shaped incision. Cut or shear the scion off.

[0011] (3) Inserting the scion: Insert the scion into the rootstock and push it to the bottom of the rootstock cut, ensuring that the cambium of the scion is aligned with the cambium of the rootstock;

[0012] (4) Bandaging: Use bandaging film to fully seal and prevent buds from being exposed;

[0013] (5) Check the survival rate, re-graft and ring-cut the scion to promote budding: Check the survival rate 18-22 days after grafting, re-graft any grafts that did not survive, and ring-cut / ring-cut the phloem of the rootstock above the scion, with a ring-cut width of 1.8-2.2 cm;

[0014] The chip budding comprises the following steps:

[0015] (1') Cutting the rootstock: Ring the trunk 1m-1.5m above the ground to promote the germination of the latent buds of the rootstock. After the latent buds germinate below the ringing, select 3-4 strong new shoots in different directions and remove all the others. After the selected new shoots become lignified, they will be used as the rootstock. Select the grafting site 5-10cm above the base of the rootstock and make a longitudinal cut with a knife to the depth of the cambium layer. The cut is 1.8-2.2cm long. Then make a horizontal cut to remove 1.3-1.7cm of phloem.

[0016] (2') Cutting the scion and inserting the bud: Make a vertical cut 1.3-1.7cm above the bud, and make a cut 0.8-1.2cm below the bud; make a diagonal cut close to the petiole, at an angle of 25-35°, and just deep enough to cut the bud, to obtain a shield-shaped bud; remove the bud and insert it into the cut of the rootstock and push it to the bottom of the rootstock, making sure that the cambium of the rootstock and the cambium of the scion are aligned;

[0017] (3') Bandaging: Use bandaging film to fully seal and prevent the buds from being exposed;

[0018] (4') Check the survival rate, re-graft and ring-bark the scion to promote budding: Check the survival rate 18-22 days after grafting, re-graft any grafts that do not survive; and ring-bark the phloem of the rootstock above the scion to a width of 1.8-2.2 cm;

[0019] (5') Management after grafting: keep only one new shoot from each grafted bud and remove the rest; pinch off the top of the new shoot when it grows to 18-22cm. After the new shoot becomes lignified, remove the wrapping film and the hidden buds that germinate on the rootstock.

[0020] Preferably, in step S1, one-year-old branches that are pure in variety, strong in growth, have full axillary buds, are free of diseases and insect pests, and are completely lignified are selected as scions.

[0021] Preferably, in step (1'), the ring stripping width is 1.8-2.2 cm.

[0022] Preferably, in step (2), the scion is cut or sheared at 0.3-0.5 cm above the bud.

[0023] Preferably, in step (4), the lower portion of the wrapping exceeds the rootstock incision by 0.3-0.7 cm, and the upper portion of the wrapping exceeds the scion by 0.8-1.2 cm.

[0024] Preferably, in step (2'), the longitudinal cut is made to a depth that leaves only a slight trace of wood.

[0025] Preferably, in step (4'), the phloem of the rootstock is ringed at 1.8-2.2 cm above the scion.

[0026] A second aspect of the present invention provides an application of the above-mentioned method of grafting astringent persimmons onto Taiqiu sweet persimmons to produce two fruits on one tree without changing the planting process in grafting astringent persimmons onto Taiqiu sweet persimmons.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. The present invention applies the method of grafting astringent persimmons onto Taiqiu sweet persimmons without changing the species to astringent persimmons, achieving the highly efficient production of two fruits per tree. The astringent persimmons remain in the upper canopy, where they hang abundantly in winter for tourists to admire and photograph. The lower canopy produces high-value Taiqiu sweet persimmons for sale to tourists. Since Taiqiu sweet persimmons command a much higher price than astringent persimmons, they can be eaten directly from the tree, providing an immersive experience for tourists while also increasing income for fruit farmers. Fruiting begins two years after grafting, and the yield per tree reaches 25 kilograms (market price 40 yuan / kilogram) in five years, increasing annual profits by approximately 1,000 yuan per tree.

[0029] 2. The present invention realizes two fruits on one tree by high grafting without changing the species. The original variety still maintains the yield during the formation of the crown at the high grafting part. After the crown is formed at the high grafting part, the upper and lower parts bear fruit at the same time, the upper part is the original variety, and the lower part is the new variety, which is both novel and increases income. The assimilated substances of the original variety in the upper part can still be continuously supplied to the root system, playing a role in nourishing the roots. The new variety grafted at the lower part gradually forms a new crown, which becomes one after many years of fusion. There is no problem of root rot caused by a large amount of sawing of the aboveground part and the serious imbalance of the underground part in high grafting and changing the species, and there is no problem of incompatibility in the later stage of high grafting and changing the species. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying any creative work, other drawings obtained based on these drawings still fall within the scope of the present invention.

[0031] Figure 1 This is a schematic diagram of the invention's method of grafting astringent persimmons onto sweet persimmons without replanting them on one tree with two fruits;

[0032] Figure 2This is a schematic diagram of Example 1 of the present invention, using Taiqiu sweet persimmon as the scion and astringent persimmon as the rootstock, and directly grafting them on the trunk;

[0033] Figure 3 This is a schematic diagram of Example 2 of the present invention, wherein Taiqiu sweet persimmon is used as the scion, astringent persimmon is used as the rootstock, and ring barking is performed to promote the germination of the hidden buds of the rootstock and then belly grafting is performed;

[0034] Figure 4 This is a schematic diagram of Example 3 of the present invention, in which Taiqiu sweet persimmon is used as the scion and astringent persimmon is used as the rootstock, and budding is performed after ring barking to promote the germination of the latent buds of the rootstock. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings.

[0036] like Figure 1 The diagram shows a tree with two fruits, wherein the upper and lower parts of the persimmons grown by the high grafting without changing the seeds according to various embodiments of the present invention bear fruit simultaneously, the upper part of the crown still retains astringent persimmons, and the lower part of the crown bears Taiqiu sweet persimmons.

[0037] Example 1

[0038] In this embodiment, Taiqiu sweet persimmon was used as the scion and astringent persimmon was used as the intermediate stock, and the grafting was performed directly on the trunk.

[0039] Belly grafting can be done in spring, before buds emerge, in summer or autumn, or even after leaves fall in winter. Spring and summer grafting generally produces buds and growth in the same year, but no flower buds will form. Autumn and winter grafting, however, will not produce buds in the same year.

[0040] The specific steps are as follows:

[0041] S1. Selecting scion

[0042] Choose pure, healthy, well-developed, fully lignified, disease-free, and annual branches as scions. In summer and autumn, immediately remove the leaves, leaving only the petioles. Bundle 20 scions together and wrap them in a clean, damp towel to keep them moist. Before bud break in spring and after leaf fall in winter, wrap the scions directly in a clean, damp towel to keep them moist.

[0043] S2. Grafting (belly grafting)

[0044] (1) Cutting the rootstock

[0045] Select four directions (east, south, west and north) on the trunk of the tree 1-1.5m above the ground, or select three directions at 120 degrees. A relatively straight area is used as the grafting site. Use a grafting knife to cut straight from top to bottom. The depth of the incision should just reach the cambium. The incision should be 2cm long. Leave 1cm of phloem and remove the excess phloem.

[0046] (2) Cutting the scion

[0047] Hold the scion upright with your left hand and make a 30-degree bevel cut 1.5-2.0 cm below one side of the bud, creating a smooth, horse-ear-shaped cut. Then, make a flat cut 0.3 cm below the bud on the other side, just reaching the cambium layer and intersecting the first cut. With your left hand in an inverted grip, hold the uncut part of the bud below the bud and cut or shear the scion 0.3-0.5 cm above the bud with a grafting knife or pruning shears. Quickly insert the removed scion into the cut on the rootstock.

[0048] (3) Inserting the scion

[0049] Use both hands to coordinate, with the horse-ear-shaped incision facing outward and the straight incision facing inward, align the cambium on the long side of the scion incision with the cambium of the rootstock, and gently push the scion to the bottom of the rootstock incision. After ensuring that the cambium of the rootstock and scion are aligned, quickly wrap and moisturize.

[0050] (4) Bandaging

[0051] Use a 2-3cm wide grafting wrapping film to wrap the scion from bottom to top. Do not move the scion during wrapping. The wrapping length should be 0.5cm longer than the rootstock incision at the bottom and 1.0cm longer than the scion at the top. Use a fully enclosed wrapping method that does not expose the buds.

[0052] (5) Check the survival rate, grafting and ring barking to promote budding

[0053] Check the survival rate 20 days after grafting, and re-graft any grafts that have not survived. Then, ring-cut (or girdle) the rootstock 2 cm above the top scion, with a ring width of about 2.0 cm, to remove the phloem.

[0054] For spring grafting and summer grafting, 20 days after the rootstock is ring-barked (or ring-cut), the buds on the scion will germinate one after another, break through the wrapping film and grow normally. If some buds cannot break through the wrapping film, the film can be broken artificially.

[0055] For grafting in autumn or winter, after the rootstock is ring-barked (or ring-cut), the grafted buds will not sprout in the same year, but will sprout very neatly and grow well in the second year.

[0056] (6) Post-handover management

[0057] Leave only one new shoot on each scion, and remove the rest as soon as possible. Pinch off the top of the new shoot when it's 20 cm tall. Once the new shoot has lignified, remove the wrapping film. Also, remove any latent buds that sprout from the rootstock.

[0058] The growth results of this embodiment are as follows Figure 2 shown.

[0059] Example 2

[0060] In this embodiment, Taiqiu sweet persimmon is used as the scion and astringent persimmon is used as the intermediate rootstock. The rootstock is girdled (or ring-cut) to promote the germination of latent buds before belly grafting.

[0061] S1. Selecting scion

[0062] Choose pure, healthy, well-developed, fully lignified, disease-free, and annual branches as scions. In summer and autumn, immediately remove the leaves, leaving only the petioles. Bundle 20 scions together and wrap them in a clean, damp towel to keep them moist. Before bud break in spring and after leaf fall in winter, wrap the scions directly in a clean, damp towel to keep them moist.

[0063] S2. Ringing (or girdling) to promote rootstock latent bud germination

[0064] From spring bud break to summer, gird (or ring-cut) the main trunk 1-1.5 m above the ground, with a girdling width of approximately 2.0 cm. Once latent buds sprout below the girdling (or ring-cut) zone, select 3-4 strong new shoots in different orientations and remove all others. Once the selected shoots have lignified, grafting can be performed. If girdling is performed after spring bud break to encourage latent bud germination, grafting can be performed in the summer. The grafted buds will germinate and grow within the same year, with a certain amount of growth. If girdling is performed to encourage latent bud germination in the summer, grafting can be performed in the fall or winter; the grafted buds will not germinate within the same year.

[0065] S3. Grafting (belly grafting)

[0066] (1) Cutting the rootstock

[0067] Once the new shoot below the girdling (or ring cutting) is completely woody, it can be used as a rootstock for grafting. Choose four directions (east, south, west, and north), or three directions staggered 120 degrees. A relatively flat area should be used as the grafting site. Use a grafting knife to make a straight cut from top to bottom 5-10 cm from the base of the rootstock, just deep enough to reach the cambium layer. The cut should be 2 cm long, leaving 1 cm of phloem and removing any excess.

[0068] (2) Cutting the scion

[0069] Hold the scion upright with your left hand and make a 30-degree bevel cut 1.5-2.0 cm below one side of the bud, creating a smooth, horse-ear-shaped cut. Then, make a flat cut 0.3 cm below the bud on the other side, just reaching the cambium layer and intersecting the first cut. With your left hand in an inverted grip, hold the uncut part of the bud below the bud and cut or shear the scion 0.3-0.5 cm above the bud with a grafting knife or pruning shears. Quickly insert the removed scion into the cut on the rootstock.

[0070] (3) Inserting the scion

[0071] Use both hands to coordinate, with the horse-ear-shaped incision facing outward and the straight incision facing inward, align the cambium on the long side of the scion incision with the cambium of the rootstock, and gently push the scion to the bottom of the rootstock incision. After ensuring that the cambium of the rootstock and scion are aligned, quickly wrap and moisturize.

[0072] (4) Bandaging

[0073] Use a 2-3cm wide grafting wrapping film to wrap the scion from bottom to top. Do not move the scion during wrapping. The wrapping length should be 0.5cm longer than the rootstock incision at the bottom and 1.0cm longer than the scion at the top. Use a fully enclosed wrapping method that does not expose the buds.

[0074] (5) Check the survival rate, grafting and ring barking to promote budding

[0075] Check the survival rate 20 days after grafting, and re-graft any grafts that do not survive. Then, ring-bark the rootstock 2 cm above the top scion, about 2.0 cm wide, to remove the phloem.

[0076] For spring grafting and summer grafting, 20 days after the rootstock is ring-barked (or ring-cut), the buds on the scion will germinate one after another, break through the wrapping film and grow normally. If some buds cannot break through the wrapping film, the film can be broken artificially.

[0077] For grafting in autumn or winter, after the rootstock is ring-barked (or ring-cut), the grafted buds will not sprout in the same year, but will sprout very neatly and grow well in the second year.

[0078] The growth results of this embodiment are as follows Figure 3 shown.

[0079] Example 3

[0080] In this embodiment, Taiqiu sweet persimmon is used as the scion and astringent persimmon is used as the intermediate rootstock. The rootstock is ring-barked (or ring-cut) to promote the germination of latent buds and then the budding is carried out.

[0081] S1. Selecting scion

[0082] Choose pure, healthy, well-developed, fully lignified, disease-free, and annual branches as scions. In summer and autumn, immediately remove the leaves, leaving only the petioles. Bundle 20 scions together and wrap them in a clean, damp towel to keep them moist. Before bud break in spring and after leaf fall in winter, wrap the scions directly in a clean, damp towel to keep them moist.

[0083] S2. Ringing (or girdling) to promote rootstock latent bud germination

[0084] From spring bud break to summer, gird (or ring-cut) the main trunk 1-1.5 m above the ground, with a girdling width of approximately 2.0 cm. After latent buds sprout below the girdling zone, select 3-4 strong new shoots growing in different directions and remove all others. Once the selected shoots have lignified, grafting can be performed. If girdling (or ring-cutting) is performed after spring bud break to encourage latent bud germination, grafting can be performed in the summer. The grafted buds will germinate and grow in the same year, with a certain amount of growth. If girdling is performed to encourage latent bud germination in the summer, grafting can be performed in the fall or winter; the grafted buds will not germinate in the same year.

[0085] S3. Grafting (Chip Bud Grafting)

[0086] (1) Cutting the rootstock

[0087] Once the new shoot left below the girdling (or ring cutting) cut is completely woody, it can be used as a rootstock for grafting. Choose four locations (east, south, west, and north) or three locations staggered 120 degrees from the base of the rootstock, 5-10 cm from the rootstock. A relatively straight area will serve as the grafting site. Use a grafting knife to make a vertical cut just down to the cambium layer, about 2 cm long. Then make a horizontal cut, removing 1.5 cm of the phloem.

[0088] (2) Cutting the scion and inserting the bud

[0089] Hold the scion in your left hand and use a grafting knife to make a vertical cut 1.5 cm above the bud, just enough to touch the wood. Cut down to 1.0 cm below the bud. Then, make a diagonal cut just below the petiole at a 30-degree angle, just deep enough to cut through the bud, creating a shield-shaped graft. Remove the graft and quickly insert it into the rootstock cut to the bottom, aligning the rootstock and scion cambium.

[0090] (3) Bandaging

[0091] Use a 2cm wide grafting film to wrap and moisturize, and use a fully enclosed wrapping method to prevent buds from being exposed.

[0092] (4) Check the survival rate, grafting and ring barking to promote budding

[0093] Check the survival rate 20 days after grafting, and re-graft any grafts that do not survive. Then, ring-bark the rootstock 2 cm above the grafted bud with a width of about 1.0 cm to remove the phloem.

[0094] (5) Post-connection management

[0095] Only one new shoot should be left from each grafted bud, and the rest should be removed as soon as possible. Pinch off the top of the new shoot when it is 20 cm tall. Once the new shoot has lignified, remove the wrapping film promptly. Also, remove any latent buds that have sprouted from the rootstock promptly.

[0096] The growth results of this embodiment are as follows Figure 4 shown.

[0097] Because astringent persimmons do not lose their astringency while on the tree, they are astringent when first picked and cannot be eaten directly. They need to be de-astringent before they can be eaten. They are unpopular with fast-paced consumers and few people pick them. The bright red persimmons hanging on the trees in winter have become a beautiful sight. Sweet persimmons lose their astringency while on the tree and can be eaten right off the tree. They are sweet and crisp, making them very popular with consumers. Grafting sweet persimmons onto astringent persimmons maintains the beautiful winter scenery of bright red persimmons, achieving the highly efficient production of two fruits per tree and increasing farmers' income.

[0098] The grafting method of Example 1-3 bears fruit 2 years after survival, and the yield per plant reaches 25 kilograms (market price 40 yuan / kilogram) in 5 years, with an average annual benefit of about 1,000 yuan per seed.

[0099] The above disclosure is merely a preferred embodiment of the present invention and certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A method for grafting astringent persimmons onto sweet persimmons without changing the tree to produce two fruits, characterized in that: The steps include: S1: Prepare astringent persimmon rootstock and select suitable Taiqiu sweet persimmon scion; S2: Grafting Taiqiu sweet persimmon onto astringent persimmon: Select a grafting site 1m-1.5m above the ground on the main trunk of the astringent persimmon and directly graft the Taiqiu sweet persimmon on the belly. Alternatively, ring-bark the main trunk 1m-1.5m above the ground to induce latent bud germination of the rootstock. After lignification, graft the Taiqiu sweet persimmon on the belly or insert the bud. This will produce astringent persimmon fruits on the upper crown and Taiqiu sweet persimmon fruits on the lower crown. Wherein, the belly-joining comprises the following steps: (1) Cutting the rootstock: Choose a straight part of the trunk 1m-1.5m above the ground, and cut straight from top to bottom with a knife. The cut should be as deep as the cambium layer and 1.8-2.2cm long. Leave 0.8-1.2cm of phloem and remove the excess phloem. (2) Cutting the scion: Make a diagonal cut at an angle of 25-35° 1.5-2.0 cm below one side of the bud to form a horse-ear-shaped incision; then, make a straight cut 0.2-0.4 cm below the bud on the other side of the bud to form a straight incision. The depth of the straight incision should reach the cambium layer and just intersect with the horse-ear-shaped incision. Cut or shear the scion off. (3) Inserting the scion: Insert the scion into the rootstock and push it to the bottom of the rootstock cut, ensuring that the cambium of the scion is aligned with the cambium of the rootstock; (4) Bandaging: Use bandaging film to fully seal and prevent buds from being exposed; (5) Check the survival rate, re-graft and ring-cut the scion to promote budding: Check the survival rate 18-22 days after grafting, re-graft any grafts that did not survive, and ring-cut / ring-cut the phloem of the rootstock above the scion, with a ring-cut width of 1.8-2.2 cm; The chip budding comprises the following steps: (1') Cutting the rootstock: Ring the trunk 1m-1.5m above the ground to promote the germination of the latent buds of the rootstock. After the latent buds germinate below the ringing, select 3-4 strong new shoots in different directions and remove all the others. After the selected new shoots become lignified, they will be used as the rootstock. Select the grafting site 5-10cm above the base of the rootstock and make a longitudinal cut with a knife to the depth of the cambium layer. The cut is 1.8-2.2cm long. Then make a horizontal cut to remove 1.3-1.7cm of phloem. (2') Cutting the scion and inserting the bud: Make a vertical cut 1.3-1.7cm above the bud, and make a cut 0.8-1.2cm below the bud; make a diagonal cut close to the petiole, at an angle of 25-35°, and just deep enough to cut the bud, to obtain a shield-shaped bud; remove the bud and insert it into the cut of the rootstock and push it to the bottom of the rootstock, making sure that the cambium of the rootstock and the cambium of the scion are aligned; (3') Same as step (4); (4') is the same as step (5); (5') Management after grafting: keep only one new shoot from each grafted bud and remove the rest; pinch off the top of the new shoot when it grows to 18-22cm. After the new shoot becomes lignified, remove the wrapping film and the hidden buds that germinate on the rootstock.

2. The method of high-grafting astringent persimmons into sweet persimmons without changing the planting tree to produce two fruits according to claim 1, characterized in that: In step S1, one-year-old branches that are pure in variety, strong in growth, have full axillary buds, are free of pests and diseases, and are completely lignified are selected as scions.

3. The method of high-grafting astringent persimmons into sweet persimmons without changing the planting tree to produce two fruits according to claim 1, characterized in that: In step (1'), the ring stripping width is 1.8-2.2 cm.

4. The method of high-grafting astringent persimmons into sweet persimmons without changing the planting tree to produce two fruits according to claim 1, characterized in that: In step (2), the scion is cut or sheared 0.3-0.5 cm above the bud.

5. The method of high-grafting astringent persimmons into sweet persimmons without changing the planting tree to produce two fruits according to claim 1, characterized in that: In step (4), the lower part of the wrapping should extend 0.3-0.7 cm beyond the cut of the rootstock, and the upper part of the wrapping should extend 0.8-1.2 cm beyond the scion.

6. The method of high-grafting astringent persimmons into sweet persimmons without changing the planting tree to produce two fruits according to claim 1, characterized in that: In step (2'), make a longitudinal cut to the depth of just the woody part.

7. Use of the method of grafting astringent persimmons onto Taiqiu sweet persimmons without replanting one tree with two fruits as described in any one of claims 1 to 6 in grafting astringent persimmons onto Taiqiu sweet persimmons.

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