Method for controlling vigorous growth of carya illinoensis by inversely cutting off peel of carya illinoensis

Abstract

The invention relates to the technical field of carya illinoensis, and particularly discloses a method for controlling vigorous growth of carya illinoensis by inversely cutting the peel of carya illinoensis. The invention relates to a carya illinoensis' inverted bark cutting 'vigorous growth control method, which comprises the following steps: S1, girdling: girdling a vigorous tree trunk or branch of a carya illinoensis tree by using a girdling cutter, cutting off bark and phloem, forming a strip-shaped annular groove in the tree trunk or branch, and retaining the cut annular bark; s2, inversely cutting the barks: taking the cut annular barks, inverting the annular barks, enabling the A ends of the annular barks to face the ground, enabling the B ends of the annular barks to face the crown, and embedding the barks ends of the inverted annular barks into the strip-shaped annular grooves to complete embedding of the inversely cut barks; and S3, post-processing. The method has the advantages of being easy to operate and excellent in vigorous growth control effect.

Description

Technical Field

[0001] The present application relates to the technical field of thin-shell pecans, and more specifically, to a method for controlling growth of thin-shell pecans by "reverse cutting of the skin". Background Art

[0002] The thin-shelled pecan is a tall tree that grows very fast, especially in the peak growth season, when its branches tend to grow into nutrient branches, affecting the growth of short branches and fruit branches.

[0003] In production, the method of controlling the growth of thin-shelled pecans is often to spray plant growth regulators, such as paclobutrazol and clobutrazol, for chemical control. If the concentration and frequency are not controlled well, the control will be excessive. Later, the ring cutting pruning technology was invented and applied. By cutting and shaving part of the bark, the plant cannot synthesize enough auxin in the ring cut phloem, thereby inhibiting the upward growth of the trunk and the growth of the side branches. Therefore, it is necessary to optimize the control method of thin-shelled pecans again. Summary of the invention

[0004] In order to improve the growth control effect of thin-shell pecans, the present application provides a thin-shell pecan "inverse skin cutting" growth control method, which adopts the following technical solution:

[0005] The present application provides a thin-shell pecan "inversely cut skin" growth control method, comprising the following steps:

[0006] S1. Ring cutting: Use a ring cutting tool to ring cut the vigorous trunk or branch of the hickory tree, remove the bark and phloem, expose the wood part, form a belt-shaped ring groove on the trunk or branch, and retain the cut ring bark;

[0007] S2, inverted bark: take the annular bark obtained by cutting, the annular bark having an A end and a B end, the A end being the end of the annular bark close to the tree crown, the B end being the end of the annular bark close to the ground, invert the annular bark so that the A end of the annular bark faces the ground, and the B end of the annular bark faces the tree crown, and embed the bark end of the inverted annular bark into the belt-shaped annular groove to complete the embedding of the inverted bark;

[0008] S3, post-processing: the inverted annular skin at the girdling position is tightly wrapped with a plastic film.

[0009] By adopting the above technical scheme, it is preferred to perform ring cutting on the trunks and branches with excessive nutritional growth. Ring cutting can cut off the transmission of nutrients on the trunks and branches with excessive growth. The cut ring bark is inverted and then fit into the trunk again. Since there is a nutrient transmission channel in the ring bark, and the nutrient transmission channel is thicker at the end close to the roots and thinner at the end close to the crown, after the ring bark is inverted, the thicker end of the nutrient transmission channel is close to the crown, and the thinner end of the nutrient transmission channel is close to the roots, thereby inhibiting the transmission amount and transmission rate of nutrients toward the upper part, promoting the growth of short branches and the differentiation of flower buds, achieving the effect of controlling the growth of trees, retaining the bark of the cut part, reducing tree damage, and accelerating the healing speed.

[0010] Optionally, the number of the band-shaped annular grooves on the vigorously growing trunk or branch is ≥2.

[0011] By adopting the above technical solution and setting more than two ring-cutting points, the transmission effect of the nutrient transmission channel can be effectively blocked, reducing the supply of nutrients transmitted to the vigorous growing branches, thereby achieving vigorous growth control.

[0012] Optionally, the spacing between adjacent band-shaped annular grooves is 30-40 cm.

[0013] By adopting the above technical solution, the distance between adjacent ring cuts can be controlled and the nutrient supply in the branches can be evenly reduced, which is conducive to stabilizing the growth control effect.

[0014] Optionally, the width of the circumcised bark in the direction of the trunk or branch is one third of the stem diameter, and the maximum width cannot exceed 8 cm.

[0015] Preferably, the width of the circumcised bark in the trunk or branch direction is 2-3 cm.

[0016] By adopting the above technical solution, the width of the circumcised bark is optimized. The appropriate width is conducive to the circumcised bark being embedded into the original incision after being inverted, thereby reducing damage to the tree and accelerating the healing speed.

[0017] Optionally, the ring cutting in step S1 is performed during the vigorous growth period of the walnuts from June to July.

[0018] By adopting the above technical scheme, it is preferred to perform ring cutting during the vigorous growth period of thin-shelled pecans, which can effectively determine the branches of thin-shelled pecans with excessive nutritional growth, which is conducive to making multiple branches of thin-shelled pecans obtain a more uniform growth effect and promote short branch growth and flower bud differentiation.

[0019] Optionally, the cutting edge formed by the circumcision in step S1 is smooth, neat and has no broken surface.

[0020] By adopting the above technical scheme, the smooth, neat and unbroken surface of the blade formed by the ring cutting can make the ring bark and the ring cutting groove fit tightly without any gap, prevent the outflow of tree tissue fluid and the invasion of pathogens, promote rapid healing between the ring bark and the ring cutting incision, reduce tree damage, and be beneficial to the growth of thin-shelled pecans.

[0021] Optionally, the plastic film is selected from water-soluble polyvinyl alcohol film.

[0022] By adopting the above-mentioned technical scheme, the present application preferably uses water-soluble polyvinyl alcohol film as the plastic film, so that the plastic film has better environmental protection, can gradually melt in rainy weather, and is not easy to affect the environment. Even if the plastic film is not removed later, it is not easy to affect the growth of thin-shelled pecans.

[0023] Optionally, the polyvinyl alcohol film includes polyvinyl alcohol and phytic acid composite flame retardant material.

[0024] By adopting the above technical solution, preferably adding phytic acid composite flame retardant material to polyvinyl alcohol, utilizing the high phosphorus content in phytic acid, phytic acid can utilize six phosphate groups to have a strong ability to capture free radicals and accelerate dehydration and form a carbon layer, thereby effectively improving the flame retardant effect of polyvinyl alcohol film and reducing the possibility of plastic film as a fire point. Moreover, phytic acid is a plant material, has a better environmental protection effect, can stably protect the ring incision, and has better environmental friendliness.

[0025] Optionally, the phytic acid composite flame retardant material includes a phytic acid-ethylenediamine composite material or a phytic acid-chitosan composite material.

[0026] By adopting the above technical scheme, phytic acid and ethylenediamine are preferably used as a composite material. The ethylenediamine structure contains two amino groups. The amino groups can be grafted with the phosphate groups on the phytic acid, which can effectively improve the charcoal production capacity and thermal stability of the phytic acid, and release non-flammable nitrogen-containing gas during the combustion process, effectively improving the flame retardant effect of the polyvinyl alcohol film.

[0027] It is preferred to use phytic acid and chitosan as a composite material. Chitosan has more hydroxyl groups and amino groups, and is rich in carbon and nitrogen elements, and has good flame retardant effect. Chitosan and phytic acid can together constitute an expanding flame retardant system to form an expanding flame retardant carbon layer, thereby improving the flame retardant effect of the polyvinyl alcohol film.

[0028] Optionally, the phytic acid composite flame retardant material also includes a phytic acid-histidine composite material.

[0029] By adopting the above technical scheme, phytic acid and histidine are used as a composite material. Histidine has a high nitrogen content. Histidine can combine with phytic acid through amino groups and phosphate groups to form a continuous and dense carbon layer structure and release non-flammable gas. At the same time, it can combine with polyvinyl alcohol through hydrogen bonds, which is beneficial to improve the mechanical strength of the polyvinyl alcohol film.

[0030] In summary, this application has the following beneficial effects:

[0031] 1. Since the present application preferably adopts ring cutting on the trunks and branches with excessive vegetative growth, the transmission of nutrients on the trunks and branches with excessive vegetative growth can be cut off through ring cutting, and the cut ring bark is inverted and fit into the trunk again. Since there is a nutrient transmission channel in the ring bark, and the nutrient transmission channel is thicker at the end close to the root and thinner at the end close to the crown, after the ring bark is inverted, the thicker end of the nutrient transmission channel is close to the crown, and the thinner end of the nutrient transmission channel is close to the root, thereby inhibiting the transmission amount and transmission rate of nutrients toward the upper vigorous growth, promoting the growth of short branches and the differentiation of flower buds, achieving the effect of controlling the growth of trees, retaining the bark of the cut part, reducing tree damage, and accelerating the healing speed.

[0032] 2. In the present application, it is preferred to perform ring cutting during the vigorous growth period of thin-shelled pecans from June to July, which can effectively determine the branches of thin-shelled pecans with excessive vegetative growth, and is conducive to making multiple branches of thin-shelled pecans obtain a more uniform growth effect, promoting the growth of short branches and the differentiation of flower buds.

[0033] 3. The present application stipulates that the blade formed by ring cutting is smooth, neat, and has no cracks, which can make the ring skin and the ring cutting groove fit tightly without gaps, prevent the outflow of tree tissue fluid and the invasion of pathogens, promote rapid healing between the ring skin and the ring cutting incision, reduce tree damage, and be beneficial to the growth of thin-shelled pecans. DETAILED DESCRIPTION

[0034] The present application is further described in detail below with reference to the embodiments.

[0035] Example

[0036] Example 1

[0037] The present application provides a thin-shell pecan "inversely cut skin" growth control method, comprising the following steps:

[0038] S1. Ring cutting: Use a ring cutting tool to ring cut the trunk or branches of the thin-shelled hickory tree, remove the bark and phloem, expose the wood, form a belt-shaped ring groove on the trunk or branch, and retain the cut ring bark;

[0039] S2, inverted bark: take the annular bark obtained by cutting, the annular bark having an A end and a B end, the A end being the end of the annular bark close to the tree crown, the B end being the end of the annular bark close to the ground, invert the annular bark so that the A end of the annular bark faces the ground, and the B end of the annular bark faces the tree crown, and embed the bark end of the inverted annular bark into the belt-shaped annular groove to complete the embedding of the inverted bark;

[0040] S3, post-processing: the inverted annular skin at the girdling position is tightly wrapped with a plastic film.

[0041] Specifically, in this embodiment, it is preferred to perform ring cutting during the vigorous growth period of the thin-shelled pecan trees from June to July, which is helpful in identifying branches of the thin-shelled pecan with excessive vegetative growth, and is helpful in making multiple branches of the thin-shelled pecan obtain a more uniform growth effect, thereby promoting short branch growth and flower bud differentiation.

[0042] Specifically, in this embodiment, it is preferred to use ring cutting on the branches of thin-shelled pecans that are growing vigorously. The ring cutting removes the bark and phloem, and keeps the ring cutting edge smooth, neat, and without broken surfaces. This is conducive to the fit between the ring skin and the ring groove, so that the ring skin can fit tightly with the ring cutting position without any gap, preventing the outflow of tree tissue fluid and the invasion of pathogens, which is conducive to reducing tree damage and accelerating the healing speed.

[0043] Specifically, the number of band-shaped annular grooves is 2, the spacing between the two band-shaped annular grooves is 35 cm, and the width of the band-shaped annular groove in the extension direction of the trunk is 3 cm, that is, the width of the ring bark is 3 cm. The number, spacing and size of the ring cuttings are optimized. The appropriate number of ring cuttings can effectively inhibit the excessive growth of the upper branches, the appropriate spacing can effectively inhibit the transmission of nutrients, and the appropriate ring cutting size can reduce damage to the trunk and facilitate the healing of the ring bark and the ring cutting site.

[0044] Specifically, in this embodiment, a water-soluble polyvinyl alcohol film is preferably used as the plastic film to cover the ring-cutting area.

[0045] In the present application, it is preferred to perform ring cutting on tree trunks and branches with excessive vegetative growth. Ring cutting can cut off the transmission of nutrients on tree trunks and branches with excessive growth. The cut ring bark is inverted and then fit into the trunk again. Since there is a nutrient transmission channel in the ring bark, and the nutrient transmission channel is thicker at the end close to the root and thinner at the end close to the crown, after the ring bark is inverted, the thicker end of the nutrient transmission channel is close to the crown, and the thinner end of the nutrient transmission channel is close to the root, thereby inhibiting the transmission amount and transmission rate of nutrients toward the upper part, promoting the growth of short branches and differentiation of flower buds, achieving the effect of controlling the growth of trees, retaining the bark of the cut part, reducing tree damage, and accelerating the healing speed.

[0046] The flame retardant properties of the polyvinyl alcohol film were tested: LOI was 18.4%.

[0047] Example 2

[0048] The present application provides a thin-shell pecan "inversely cut skin" growth control method, comprising the following steps:

[0049] S1. Ring cutting: Use a ring cutting tool to ring cut the trunk or branches of the thin-shelled hickory tree, remove the bark and phloem, expose the wood, form a belt-shaped ring groove on the trunk or branch, and retain the cut ring bark;

[0050] S2, inverted bark: take the annular bark obtained by cutting, the annular bark having an A end and a B end, the A end being the end of the annular bark close to the tree crown, the B end being the end of the annular bark close to the ground, invert the annular bark so that the A end of the annular bark faces the ground, and the B end of the annular bark faces the tree crown, and embed the bark end of the inverted annular bark into the belt-shaped annular groove to complete the embedding of the inverted bark;

[0051] S3, post-processing: the inverted annular skin at the girdling position is tightly wrapped with a plastic film.

[0052] Specifically, in this embodiment, it is preferred to perform ring cutting when the thin-shelled pecan trees are in a vigorous growth period, which is helpful for identifying branches of the thin-shelled pecan with excessive vegetative growth, and is helpful for making multiple branches of the thin-shelled pecan obtain a more uniform growth effect, thereby promoting short branch growth and flower bud differentiation.

[0053] Specifically, in this embodiment, it is preferred to use ring cutting on the branches of thin-shelled pecans that are growing vigorously. The ring cutting removes the bark and phloem, and keeps the ring cutting edge smooth, neat, and without broken surfaces. This is conducive to the fit between the ring skin and the ring groove, so that the ring skin can fit tightly with the ring cutting position without any gap, preventing the outflow of tree tissue fluid and the invasion of pathogens, which is conducive to reducing tree damage and accelerating the healing speed.

[0054] Specifically, the number of band-shaped annular grooves is 2, the spacing between the two band-shaped annular grooves is 35 cm, and the width of the band-shaped annular groove in the extension direction of the trunk is 2 cm, that is, the width of the ring bark is 3 cm. The number, spacing and size of the ring cuttings are optimized. The appropriate number of ring cuttings can effectively inhibit the excessive growth of the upper branches, the appropriate spacing can effectively inhibit the transmission of nutrients, and the appropriate ring cutting size can reduce damage to the trunk and facilitate the healing of the ring bark and the ring cutting site.

[0055] Specifically, in this embodiment, a water-soluble polyvinyl alcohol film is preferably used as the plastic film to cover the ring-cutting area.

[0056] Example 3

[0057] The present application provides a thin-shell pecan "inversely cut skin" growth control method, comprising the following steps:

[0058] S1. Ring cutting: Use a ring cutting tool to ring cut the trunk or branches of the thin-shelled hickory tree, remove the bark and phloem, expose the wood, form a belt-shaped ring groove on the trunk or branch, and retain the cut ring bark;

[0059] S2, inverted bark: take the annular bark obtained by cutting, the annular bark having an A end and a B end, the A end being the end of the annular bark close to the tree crown, the B end being the end of the annular bark close to the ground, invert the annular bark so that the A end of the annular bark faces the ground, and the B end of the annular bark faces the tree crown, and embed the bark end of the inverted annular bark into the belt-shaped annular groove to complete the embedding of the inverted bark;

[0060] S3, post-processing: the inverted annular skin at the girdling position is tightly wrapped with a plastic film.

[0061] Specifically, in this embodiment, it is preferred to perform ring cutting during the vigorous growth period of the thin-shelled pecan trees from June to July, which is helpful in identifying branches of the thin-shelled pecan with excessive vegetative growth, and is helpful in making multiple branches of the thin-shelled pecan obtain a more uniform growth effect, thereby promoting short branch growth and flower bud differentiation.

[0062] Specifically, in this embodiment, it is preferred to use ring cutting on the branches of thin-shelled pecans that are growing vigorously. The ring cutting removes the bark and phloem, and keeps the ring cutting edge smooth, neat, and without broken surfaces. This is conducive to the fit between the ring skin and the ring groove, so that the ring skin can fit tightly with the ring cutting position without any gap, preventing the outflow of tree tissue fluid and the invasion of pathogens, which is conducive to reducing tree damage and accelerating the healing speed.

[0063] Specifically, the number of band-shaped annular grooves is 3, the spacing between two band-shaped annular grooves is 35 cm, and the width of the band-shaped annular groove in the extension direction of the trunk is 3 cm, that is, the width of the ring bark is 3 cm. The number, spacing and size of the ring cuttings are optimized. The appropriate number of ring cuttings can effectively inhibit the excessive growth of the upper branches, the appropriate spacing can effectively inhibit the transmission of nutrients, and the appropriate ring cutting size can reduce damage to the trunk and is conducive to the healing of the ring bark and the ring cutting site.

[0064] Specifically, in this embodiment, a water-soluble polyvinyl alcohol film is preferably used as the plastic film to cover the ring-cutting area.

[0065] Example 4

[0066] The present application provides a thin-shell pecan "inversely cut skin" growth control method, comprising the following steps:

[0067] S1. Ring cutting: Use a ring cutting tool to ring cut the trunk or branches of the thin-shelled hickory tree, remove the bark and phloem, expose the wood, form a belt-shaped ring groove on the trunk or branch, and retain the cut ring bark;

[0068] S2, inverted bark: take the annular bark obtained by cutting, the annular bark having an A end and a B end, the A end being the end of the annular bark close to the tree crown, the B end being the end of the annular bark close to the ground, invert the annular bark so that the A end of the annular bark faces the ground, and the B end of the annular bark faces the tree crown, and embed the bark end of the inverted annular bark into the belt-shaped annular groove to complete the embedding of the inverted bark;

[0069] S3, post-processing: the inverted annular skin at the girdling position is tightly wrapped with a plastic film.

[0070] Specifically, in this embodiment, it is preferred to perform ring cutting during the vigorous growth period of the thin-shelled pecan trees from June to July, which is helpful in identifying branches of the thin-shelled pecan with excessive vegetative growth, and is helpful in making multiple branches of the thin-shelled pecan obtain a more uniform growth effect, thereby promoting short branch growth and flower bud differentiation.

[0071] Specifically, in this embodiment, it is preferred to use ring cutting on the branches of thin-shelled pecans that are growing vigorously. The ring cutting removes the bark and phloem, and keeps the ring cutting edge smooth, neat, and without broken surfaces. This is conducive to the fit between the ring skin and the ring groove, so that the ring skin can fit tightly with the ring cutting position without any gap, preventing the outflow of tree tissue fluid and the invasion of pathogens, which is conducive to reducing tree damage and accelerating the healing speed.

[0072] Specifically, the number of band-shaped annular grooves is 2, the spacing between the two band-shaped annular grooves is 30 cm, and the width of the band-shaped annular groove in the extension direction of the trunk is 3 cm, that is, the width of the ring bark is 3 cm. The number, spacing and size of the ring cuttings are optimized. The appropriate number of ring cuttings can effectively inhibit the excessive growth of the upper branches, the appropriate spacing can effectively inhibit the transmission of nutrients, and the appropriate ring cutting size can reduce damage to the trunk and is conducive to the healing of the ring bark and the ring cutting site.

[0073] Specifically, in this embodiment, a water-soluble polyvinyl alcohol film is preferably used as the plastic film to wrap the circumcision area.

[0074] Example 5

[0075] The present application provides a thin-shell pecan "inversely cut skin" growth control method, comprising the following steps:

[0076] S1. Ring cutting: Use a ring cutting tool to ring cut the trunk or branches of the thin-shelled hickory tree, remove the bark and phloem, expose the wood, form a belt-shaped ring groove on the trunk or branch, and retain the cut ring bark;

[0077] S2, inverted bark: take the annular bark obtained by cutting, the annular bark having an A end and a B end, the A end being the end of the annular bark close to the tree crown, the B end being the end of the annular bark close to the ground, invert the annular bark so that the A end of the annular bark faces the ground, and the B end of the annular bark faces the tree crown, and embed the bark end of the inverted annular bark into the belt-shaped annular groove to complete the embedding of the inverted bark;

[0078] S3, post-processing: the inverted annular skin at the girdling position is tightly wrapped with a plastic film.

[0079] Specifically, in this embodiment, it is preferred to perform ring cutting during the vigorous growth period of the thin-shelled pecan trees from June to July, which is helpful in identifying branches of the thin-shelled pecan with excessive vegetative growth, and is helpful in making multiple branches of the thin-shelled pecan obtain a more uniform growth effect, thereby promoting short branch growth and flower bud differentiation.

[0080] Specifically, in this embodiment, it is preferred to use ring cutting on the branches of thin-shelled pecans that are growing vigorously. The ring cutting removes the bark and phloem, and keeps the ring cutting edge smooth, neat, and without broken surfaces. This is conducive to the fit between the ring skin and the ring groove, so that the ring skin can fit tightly with the ring cutting position without any gap, preventing the outflow of tree tissue fluid and the invasion of pathogens, which is conducive to reducing tree damage and accelerating the healing speed.

[0081] Specifically, the number of band-shaped annular grooves is 2, the spacing between the two band-shaped annular grooves is 40 cm, and the width of the band-shaped annular groove in the extension direction of the trunk is 3 cm, that is, the width of the ring bark is 3 cm. The number, spacing and size of the ring cuttings are optimized. The appropriate number of ring cuttings can effectively inhibit the excessive growth of the upper branches, the appropriate spacing can effectively inhibit the transmission of nutrients, and the appropriate ring cutting size can reduce damage to the trunk and facilitate the healing of the ring bark and the ring cutting site.

[0082] Specifically, in this embodiment, a water-soluble polyvinyl alcohol film is preferably used as the plastic film to wrap the girdled area tightly.

[0083] Example 6

[0084] The difference from Example 1 is that in this embodiment, a polyvinyl alcohol film is used as a plastic film to wrap the ring cut, and the polyvinyl alcohol film comprises a composite flame retardant material of polyvinyl alcohol and phytic acid in a ratio of 100:15.

[0085] Specifically, the phytic acid composite flame retardant material in this embodiment is a phytic acid-ethylenediamine composite material, and the phytic acid-ethylenediamine composite material is prepared as follows: 0.2 mL of ethylenediamine solution is taken in a container, and then 100 mL of ethanol is added to the container, and magnetic stirring is used to disperse it evenly, and then 5.94 g of PA aqueous solution is weighed and slowly dripped into the above ethylenediamine solution, and reacted at 60° C. for 12 hours. The precipitate is retained by centrifugation, washed, and dried at 80° C. for 12 hours.

[0086] The preparation of the polyvinyl alcohol film is as follows: PVA is added to deionized water and magnetically stirred for 1 hour at 95°C until the PVA is completely dissolved; then the phytic acid composite flame retardant material is added to the PVA solution and stirred for two hours until the phytic acid composite flame retardant material is dispersed in the PVA solution. The stable mixture is poured into a mold and dried at room temperature to form a flat film.

[0087] The flame retardant properties of the polyvinyl alcohol film were tested: LOI was 29.7%.

[0088] Example 7

[0089] The difference from Example 1 is that in this embodiment, a polyvinyl alcohol film is used as a plastic film to wrap the ring cut, and the polyvinyl alcohol film comprises a composite flame retardant material of polyvinyl alcohol and phytic acid in a ratio of 100:15.

[0090] Specifically, the phytic acid composite flame retardant material in this embodiment is a phytic acid-chitosan composite material, and the phytic acid-chitosan composite material is prepared as follows: 0.2 mL of chitosan hydrochloric acid solution (mass fraction 30 g / L, hydrochloric acid concentration 0.2 mol / L) is taken in a container, stirred to make it evenly dispersed, and then 5.94 g of PA aqueous solution is weighed and slowly dripped into the chitosan hydrochloric acid solution, and reacted at 60° C. for 12 hours. The precipitate is retained by centrifugation, washed, and dried at 80° C. for 12 hours.

[0091] The preparation of the polyvinyl alcohol film is as follows: PVA is added to deionized water and magnetically stirred for 1 hour at 95°C until the PVA is completely dissolved; then the phytic acid composite flame retardant material is added to the PVA solution and stirred for two hours until the phytic acid composite flame retardant material is dispersed in the PVA solution. The stable mixture is poured into a mold and dried at room temperature to form a flat film.

[0092] The flame retardant properties of the polyvinyl alcohol film were tested: LOI was 29.5%.

[0093] Example 8

[0094] The difference from Example 1 is that in this embodiment, a polyvinyl alcohol film is used as a plastic film to wrap the ring cut, and the polyvinyl alcohol film comprises a composite flame retardant material of polyvinyl alcohol and phytic acid in a ratio of 100:15.

[0095] Specifically, the phytic acid composite flame retardant material in this embodiment is a phytic acid-histidine composite material. The preparation of the phytic acid-histidine composite material is as follows: weigh PA solution (9.4 g, 70 wt.%) and histidine powder (4.5 g), then add the reactants to 50 mL of deionized water, and stir the reaction at 60 ° C for 4 hours, then pour the mixed solution into a rotary evaporator for rotary evaporation at an evaporation temperature of 80 ° C until completely dry phytic acid-histidine powder is obtained.

[0096] The preparation of the polyvinyl alcohol film is as follows: PVA is added to deionized water and magnetically stirred for 1 hour at 95°C until the PVA is completely dissolved; then the phytic acid composite flame retardant material is added to the PVA solution and stirred for two hours until the phytic acid composite flame retardant material is dispersed in the PVA solution. The stable mixture is poured into a mold and dried at room temperature to form a flat film.

[0097] The flame retardant properties of the polyvinyl alcohol film were tested: LOI was 31.5%.

[0098] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A thin-shell pecan "inversely cut skin" method for controlling growth, characterized in that: The following steps are involved: S1. Ring cutting: Use a ring cutting tool to ring cut the trunk or branches of the thin-shelled hickory tree, remove the bark and phloem, expose the wood, form a belt-shaped ring groove on the trunk or branch, and retain the cut ring bark; S2, inverted bark: take the annular bark obtained by cutting, the annular bark having an A end and a B end, the A end being the end of the annular bark close to the tree crown, the B end being the end of the annular bark close to the ground, invert the annular bark so that the A end of the annular bark faces the ground, and the B end of the annular bark faces the tree crown, and embed the bark end of the inverted annular bark into the belt-shaped annular groove to complete the embedding of the inverted bark; S3, post-processing: the inverted annular skin at the girdling position is tightly wrapped with a plastic film.

2. A thin-shell pecan "inversely cut skin" growth control method according to claim 1, characterized in that: The number of the band-shaped annular grooves on the vigorously growing trunk or branch is ≥2.

3. A thin-shell pecan "inversely cut skin" growth control method according to claim 2, characterized in that: The spacing between adjacent band-shaped annular grooves is 30-40 cm.

4. The method for controlling growth of thin-shelled pecan nuts by "cutting the skin in reverse" according to claim 1, characterized in that: The width of the circumcised bark in the direction of the trunk or branch is one third of the stem diameter, and the maximum width cannot exceed 8 cm.

5. The method for controlling growth of thin-shelled pecan nuts by "cutting the skin in reverse" according to claim 1, characterized in that: The ring cutting in step S1 is performed during the vigorous growth period of the walnut tree from June to July.

6. A thin-shell pecan "inversely cut skin" growth control method according to claim 1, characterized in that: The cutting edge formed by the circumcision in step S1 is smooth, neat and has no broken surface.

7. The method for controlling growth of thin-shelled pecan nuts by "cutting the skin in reverse" according to claim 1, characterized in that: The plastic film is selected from water-soluble polyvinyl alcohol film.

8. The method for controlling growth of thin-shelled pecan nuts by "cutting the skin in reverse" according to claim 1, characterized in that: The polyvinyl alcohol film comprises polyvinyl alcohol and phytic acid composite flame retardant material.

9. The method for controlling growth of thin-shelled pecan nuts by "cutting the skin in reverse" according to claim 1, characterized in that: The phytic acid composite flame retardant material comprises a phytic acid-ethylenediamine composite material or a phytic acid-chitosan composite material.

10. The method for controlling growth of thin-shelled pecan nuts by "cutting the skin in reverse" according to claim 1, characterized in that: The phytic acid composite flame retardant material also includes a phytic acid-histidine composite material.