Reseeding method for prolonging perennial root age limit of sugarcane

Abstract

The invention discloses a reseeding method for prolonging the perennial root age limit of sugarcane, and relates to the technical field of sugarcane cultivation. The specific reseeding method comprises the following steps: (1) determining a reseeding position: determining the reseeding position by using a reseeding positioning device; (2) reseeding: selecting a shade-tolerant sugarcane variety suitable for reseeding, cutting an upper bud section into a double-bud section, planting the double-bud section in the reseeding position after seed soaking and coating treatment, and applying a root-promoting water-retaining agent during planting; (3) reseeding management: after seedlings of the double-bud section to be reseeded grow to 20-30 cm, ratoon sugarcane seedlings of adjacent plants are cut off on the flat ground. According to the method, the reseeding position can be conveniently found, the survival rate of the reseeding seedlings is high, the growth of the reseeding seedlings is not limited by original seedlings, the reseeding seedlings and the original seedlings can synchronously grow, and reseeding is not limited by moisture conditions.

Description

Technical Field

[0001] The invention relates to the technical field of sugarcane cultivation, and in particular to a replanting method for extending the perennial root period of sugarcane. Background Art

[0002] Ravine cane is an important component of sugarcane production and occupies an extremely important position in sugarcane production. The planting area of ​​​​ravine cane accounts for about 60%-70% of the total planting area of ​​​​sugarcane. Compared with newly planted sugarcane, making good use of the germination of ravine cane to produce high-yield and high-sugar raw material sugarcane is an important cultivation system, which can save labor and reduce production input costs. It has become a consensus in the sugarcane industry to improve the economic benefits of sugarcane planting and sugar-making enterprises. The longer the perennial years, the lower the planting cost of the entire planting cycle, and the more significant the economic benefits. Due to the influence of factors such as varieties, natural conditions, and cultivation management levels in production, the number of effective stems and yields of perennial cane cane have declined year by year, and even the phenomenon of missing plants and broken ridges has occurred, which seriously restricts the development of the sugarcane industry. Therefore, checking for deficiencies and supplementing seedlings (plants) is one of the important measures to increase the number of effective stems of perennial cane cane, increase yields, extend the perennial years, and reduce production costs.

[0003] At present, the research on sugarcane replanting technology mainly adopts the methods of replanting other varieties with Guifu 98-296 stems, transplanting seedlings, and replanting the stems of the same variety. These replanting technical measures play an important role in the production of perennial sugarcane, but these technologies still have problems in the promotion and application of the replanted seedlings and the original seedlings in the field, such as the growth is not synchronized, and the survival rate of replanting is low. At the same time, most of the existing technologies can only be used for replanting in areas with sufficient water sources or after rain, which is easily restricted by water conditions. Areas with poor water conditions need to be combined with drip irrigation or artificial irrigation to improve the success rate, resulting in increased costs.

[0004] In summary, the present invention aims to provide a replanting method for extending the life of sugarcane ratoons. Summary of the invention

[0005] In view of the above shortcomings, the present invention provides a replanting method for extending the perennial root period of sugarcane, which solves the problems of inconvenient positioning of the replanting position, inconsistent growth of the replanted seedlings with the original perennial root sugarcane seedlings, low survival rate, and replanting being easily restricted by water conditions. The method of the present invention can easily find the replanting position, and the replanting is not restricted by water conditions. The survival rate of the replanted seedlings is high, and the growth of the replanted seedlings is not restricted by the original seedlings, and can grow synchronously with the original seedlings. The specific technical scheme is as follows:

[0006] A replanting method for extending the perennial root life of sugarcane comprises the following steps:

[0007] (1) Determining the position of the seedling replacement: The position of the seedling replacement is determined by using a seedling replacement positioning device, that is, when the spacing between the missing seedlings between two sugarcane bags in a row is 50-60 cm, the seedling replacement position is set at the midpoint of the spacing between the missing seedlings. When the spacing between the missing seedlings increases by 50-60 cm, a seedling replacement position is added at the midpoint of the increased spacing;

[0008] (2) Replanting: Select shade-tolerant sugarcane varieties suitable for replanting, cut the upper bud segments into double bud segments, and plant them in the replanting location after seed soaking and coating. Apply root-promoting and water-retaining agents during planting. The amount of root-promoting and water-retaining agents applied to each replanted seedling is 100-150g. Dig holes and apply fertilizer in the empty space between the sugarcane rows away from the replanting location. If the perennial sugarcane of the adjacent plant has sprouts during replanting, the sprouts need to be wiped off.

[0009] (3) Replanting management: After the double-bud segments of the replanted plants have grown to 20-30 cm, the perennial sugarcane seedlings of the adjacent plants should be cut off on the ground.

[0010] Furthermore, in step (1), the seedling positioning device includes a shell, a drill rod, a measuring rod and a handle; a motor, a rechargeable battery and a controller are arranged in the shell, and the controller is electrically connected to the motor and the rechargeable battery respectively; the handle is arranged at the left and right ends of the shell and is fixedly connected to the shell, and a button is arranged on the handle, and the button is electrically connected to the controller, and the button controls the power on and off and forward and reverse rotation of the motor; one end of the drill rod is connected to the output shaft of the motor, and the other end is provided with a drill bit; the measuring rod has a length of 50-60 cm, and the measuring rod is vertically fixed on the drill rod and is divided into two equal parts by the drill rod, the measuring rod is parallel to the handle, and the vertical distance between the drill bit and the measuring rod is 15-20 cm.

[0011] Furthermore, in step (2), the hole digging and fertilizing is as follows: digging a small hole with a length and width of 5-10 cm and a depth of 20-30 cm, applying the decomposed farmyard manure, covering with soil and irrigating with water.

[0012] Furthermore, in step (2), the shade-tolerant sugarcane variety is Guitang 49 or Guitang 47.

[0013] Furthermore, in step (2), the seed soaking and coating treatment is as follows: firstly, the double-bud stem segment is soaked in clean water for 1-2 hours, after being fished out, the surface moisture is dried in the shade, and then soaked in the seed soaking liquid for 10-20 minutes.

[0014] Furthermore, the seed soaking solution comprises: 60-90 parts of Kangpu Engen Duoduo, 10-17 parts of chitosan oligosaccharide, 15-30 parts of 50% benomyl powder, 20-25 parts of avermectin, 20-30 parts of polyethylene glycol and 9000-10000 parts of water.

[0015] Furthermore, in step (2), the root-promoting water-retaining agent comprises 10-18 parts of carboxymethyl cellulose, 26-33 parts of humic acid, 12-24 parts of bentonite, 30-45 parts of yeast, 40-58 parts of starch and 30-38 parts of crop straw. The preparation method of the root-promoting water-retaining agent is as follows: firstly, the crop straw is crushed into 3-5 mm fragments, and then steamed for 1-2 hours under hot steam, wherein the hot steam is obtained by heating and evaporating a mixture of equal amounts of water and acetic acid, and the steamed crop straw is mixed with carboxymethyl cellulose, humic acid and bentonite and stirred evenly to obtain a mixture, and the mixture is placed in a granulator and water is added to form particles with a particle size of 5-8 mm, and the particles are mixed with yeast and starch to obtain the mixture.

[0016] Furthermore, in step (2), the planting is: firstly, the root-promoting and water-retaining agent is placed in a pit dug at the replanting position, and then the double-bud segment treated with seed soaking and coating is placed therein, the soil is compacted, and sufficient water is poured to allow the roots to take root.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The applicant has invented a method for screening shade-tolerant sugarcane varieties, on which shade-tolerant varieties are selected for replanting, and a series of technical means such as adopting a replanting positioning device, applying a root-promoting water-retaining agent during replanting, and cutting off the neighboring perennial sugarcane seedlings on the ground after replanting have been adopted to solve the problems of inconvenient replanting location positioning, inconsistent growth between the replanted seedlings and the original perennial sugarcane seedlings, low survival rate, and replanting being easily restricted by water conditions. The method of the present invention can easily find the replanting location, and a planting pit can be dug at the replanting location. Replanting is not restricted by water conditions. Watering is only required once during planting, and repeated watering is not required. The survival rate of the replanted seedlings can be as high as more than 75% (the survival rate of the conventional replanting method is only about 50%). At the same time, the growth of the replanted seedlings is not restricted by the original seedlings, and can grow synchronously with the original seedlings. The plant height, stem diameter, number of effective stems and yield of the replanted seedlings at maturity are all higher than those of the traditional replanting method.

[0019] 2. The present invention can quickly locate the seedling position through the measuring rod in the seedling positioning device, and automatically dig a planting hole at the seedling position through the motor and the bricks on the drill rod, thereby realizing the rapid positioning of the seedling position and the automatic excavation of the planting hole, avoiding manual digging and planting again.

[0020] 3. The present invention applies a root-promoting water-retaining agent during replanting. The carboxymethyl cellulose and humic acid in the root-promoting water-retaining agent have hydrophilic groups such as hydroxyl and carboxyl groups, and are made into composite particles with heat-treated crop straw and bentonite, which can improve the water absorption and water retention performance of carboxymethyl cellulose and humic acid, and can absorb a large amount of root-fixing water for irrigation during planting, and the water is not easy to lose, which provides water guarantee for the growth of replanted seedlings, and can smoothly replant in areas with scarce water sources or when it is dry and rainless. At the same time, yeast can release carbon dioxide. Under the action of starch, yeast releases more carbon dioxide. Carbon dioxide can not only ensure that the soil is loose and breathable, but also promote and stimulate the growth and development of the roots of the replanted seedlings, thereby improving the survival rate of the replanted seedlings.

[0021] 4. After the replanted seedlings grow to 20-30 cm, the ratoon sugarcane seedlings of the neighboring plants are cut off on the ground, which can prevent the ratoon sugarcane seedlings from taking away sunlight and nutrients from the replanted seedlings, so that the replanted seedlings can grow rapidly and healthily, and eventually grow synchronously with the original seedlings, and also extend the ratoon life of sugarcane. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below.

[0023] Figure 1 This is a schematic diagram of the structure of the seedling positioning device for implementing 1.

[0024] Reference numerals:

[0025] 1-housing, 2-handle, 3-drill rod, 4-measuring rod, 5-drill bit, 6-motor, 7-button, 8-rechargeable battery, 9-controller. DETAILED DESCRIPTION

[0026] 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.

[0027] Example 1

[0028] like Figure 1As shown, the seedling positioning device of this embodiment includes a shell 1, a drill rod 3, a measuring rod 4 and a handle 2; a motor 6, a rechargeable battery 8 and a controller 9 are arranged in the shell 1, and the controller 9 is electrically connected to the motor 6 and the rechargeable battery 8 respectively; the handle 2 is arranged at the left and right ends of the shell 1 and is fixedly connected to the shell 1, and a button 7 is arranged on the handle 2, and the button 7 is electrically connected to the controller 9, and the button 7 controls the power on and off and the forward and reverse rotation of the motor 6; one end of the drill rod 3 is connected to the output shaft of the motor 6, and the other end is provided with a drill bit 5; the measuring rod 4 is 60 cm long, and can also be set to 50 cm in another embodiment. The measuring rod 4 is vertically fixed on the drill rod 3 and is divided into two equal parts by the drill rod 3, with each side of 30 cm. The measuring rod 4 is parallel to the handle 2, and the vertical distance between the drill bit 5 and the measuring rod 4 is 20 cm, which can also be set to 15 cm in another embodiment. When in use, hold the handle 2 with both hands, place the seedling positioning device between the two perennial sugarcane bags with missing seedlings, place the measuring rod 4 parallel to the sugarcane row, and one side of the measuring rod 4 is close to the perennial sugarcane. When the missing seedling spacing is 60cm, press the button 7 on the handle 2, the controller 9 controls the motor 6 to start, the motor 6 drives the drill rod 3 to rotate, and the rotary head 5 drills into the soil to obtain a positioned planting pit. The seedling positioning device can be used to quickly locate the seedling position in real time, and the planting pit is automatically dug at the seedling position by the motor 6 and the drill bit 5 on the drill rod 3, realizing the rapid positioning of the seedling position and the automatic excavation of the planting pit, avoiding manual digging and planting again.

[0029] Example 2

[0030] A replanting method for extending the perennial root life of sugarcane comprises the following steps:

[0031] (1) Determining the position of the seedling replacement: The position of the seedling replacement is determined by using the seedling replacement positioning device of Example 1. That is, when the spacing between the missing seedlings between two sugarcane bags in a row is 60 cm, the seedling replacement position is set at the midpoint of the spacing between the missing seedlings. When the spacing between the missing seedlings increases by 60 cm, a seedling replacement position is added at the midpoint of the increased spacing.

[0032] (2) Replanting: Select the shade-tolerant sugarcane variety Guitang No. 47 suitable for replanting, cut the upper bud segment into double bud segments, and plant them at the replanting location after soaking and coating. Before planting, put the root-promoting water-retaining agent into the pit dug at the replanting location. Apply 100g of root-promoting water-retaining agent to each replanting seedling, then put the double bud segment treated with soaking and coating, compact the soil, and water it enough to establish roots. When replanting, if the perennial root sugarcane of the neighboring plant has sprouted, it is necessary to wipe off the bud; at the same time, dig a hole with a length and width of 10cm and a depth of 30cm in the empty space between the sugarcane rows away from the replanting location, apply the decomposed farmyard manure into the hole, cover the soil, and irrigate with water to guide the roots of the perennial root sugarcane to grow at the fertilized location.

[0033] The seed soaking and coating treatment is as follows: first soak the double-bud stem segment in clean water for 1 hour, fish it out and dry the surface moisture in the shade, and then soak it in seed soaking liquid for 10 minutes; the seed soaking liquid comprises: 60 parts of Kangpu Engen Duoduo, 10 parts of chitosan oligosaccharides, 15 parts of 50% benomyl powder, 20 parts of avermectin, 20 parts of polyethylene glycol and 9000 parts of water.

[0034] The root-promoting water-retaining agent comprises: 10 parts of carboxymethyl cellulose, 26 parts of humic acid, 12 parts of bentonite, 30 parts of yeast, 40 parts of starch and 30 parts of crop straw. The preparation method of the root-promoting water-retaining agent is: firstly crush the crop straw into 3mm fragments, and then cook it under hot steam for 1 hour, wherein the hot steam is obtained by heating and evaporating a mixture of equal amounts of water and acetic acid, and the cooked crop straw is mixed with carboxymethyl cellulose, humic acid and bentonite and stirred evenly to obtain a mixture, and the mixture is put into a granulator and water is added to form particles with a particle size of 5mm, and the particles are mixed with yeast and starch to obtain.

[0035] (3) Replanting management: After the double-bud segments of the replanted plants have grown to 20 cm, the perennial sugarcane seedlings of the adjacent plants should be cut off on the ground.

[0036] Example 3

[0037] A replanting method for extending the perennial root life of sugarcane comprises the following steps:

[0038] (1) Determine the position of the seedling replacement: Use the seedling replacement positioning device of Example 1 (the measuring rod length is 50 cm) to determine the position of the seedling replacement, that is, when the spacing between the missing seedlings between two sugarcane bags in the row is 50 cm, the seedling replacement position is set at the midpoint of the spacing between the missing seedlings. When the spacing between the missing seedlings increases by 50 cm, a seedling replacement position is added at the midpoint of the increased spacing.

[0039] (2) Replanting: Select the shade-tolerant sugarcane variety Guitang No. 47 suitable for replanting, cut the upper bud segment into double bud segments, and plant them at the replanting location after soaking and coating. Before planting, put the root-promoting water-retaining agent into the pit dug at the replanting location. Apply 150g of root-promoting water-retaining agent to each replanting seedling, then put the double bud segment treated with soaking and coating, compact the soil, and water it enough to establish roots. When replanting, if the perennial root sugarcane of the neighboring plant has sprouted, it is necessary to wipe off the sprout; at the same time, dig a hole with a length and width of 5 cm and a depth of 30 cm in the empty space between the sugarcane rows away from the replanting location, apply decomposed farmyard manure into the hole, cover with soil, irrigate with water, and guide the roots of the perennial root sugarcane to grow at the fertilized location.

[0040] The seed soaking and coating treatment is as follows: first soak the double-bud stem segment in clean water for 2 hours, fish it out and dry the surface moisture in the shade, and then soak it in seed soaking liquid for 20 minutes; the seed soaking liquid comprises: 90 parts of Kangpu Engen Duoduo, 17 parts of chitosan oligosaccharides, 30 parts of 50% benomyl powder, 25 parts of avermectin, 30 parts of polyethylene glycol and 10,000 parts of water.

[0041] The root-promoting water-retaining agent comprises: 18 parts of carboxymethyl cellulose, 33 parts of humic acid, 24 parts of bentonite, 45 parts of yeast, 58 parts of starch and 38 parts of crop straw. The preparation method of the root-promoting water-retaining agent is: firstly crush the crop straw into 5 mm fragments, and then steam it for 2 hours under hot steam, wherein the hot steam is obtained by heating and evaporating a mixture of equal amounts of water and acetic acid, and the steamed crop straw is mixed with carboxymethyl cellulose, humic acid and bentonite and stirred evenly to obtain a mixture, and the mixture is put into a granulator and water is added to form particles with a particle size of 8 mm, and the particles are mixed with yeast and starch to obtain.

[0042] (3) Replanting management: After the double-bud segments of the replanted plants have grown to 30 cm, the perennial sugarcane seedlings of the adjacent plants should be cut off on the ground.

[0043] Example 4

[0044] A replanting method for extending the perennial root life of sugarcane comprises the following steps:

[0045] (1) Determining the position of the seedling replacement: The position of the seedling replacement is determined by using the seedling replacement positioning device of Example 1, that is, when the spacing between the missing seedlings between two sugarcane bags in a row is 60 cm, the seedling replacement position is set at the midpoint of the spacing between the missing seedlings. When the spacing between the missing seedlings increases by 60 cm, a seedling replacement position is added at the midpoint of the increased spacing;

[0046] (2) Replanting: Select the shade-tolerant sugarcane variety Guitang No. 47 suitable for replanting, cut the upper bud segment into double bud segments, and plant them at the replanting location after soaking and coating. Before planting, put the root-promoting water-retaining agent into the pit dug at the replanting location. Apply 120g of root-promoting water-retaining agent to each replanting seedling, then put the double bud segment treated with soaking and coating, compact the soil, and water it enough to establish roots. When replanting, if the perennial root sugarcane of the neighboring plant has sprouted, the bud needs to be wiped off; at the same time, dig a hole with a length and width of 10cm and a depth of 20cm in the empty space between the sugarcane rows away from the replanting location, apply the decomposed farmyard manure into the hole, cover the soil, and irrigate with water to guide the roots of the perennial root sugarcane to grow at the fertilized location.

[0047] The seed soaking and coating treatment is as follows: first soak the double-bud stem segment in clean water for 2 hours, fish it out and dry the surface moisture in the shade, and then soak it in seed soaking liquid for 15 minutes; the seed soaking liquid comprises: 80 parts of Kangpu Engen Duoduo, 15 parts of chitosan oligosaccharides, 24 parts of 50% benomyl powder, 22 parts of avermectin, 25 parts of polyethylene glycol and 10,000 parts of water.

[0048] The root-promoting water-retaining agent comprises: 15 parts of carboxymethyl cellulose, 30 parts of humic acid, 21 parts of bentonite, 41 parts of yeast, 45 parts of starch and 33 parts of crop straw. The preparation method of the root-promoting water-retaining agent is: firstly crush the crop straw into 5 mm fragments, and then steam it for 2 hours under hot steam, wherein the hot steam is obtained by heating and evaporating a mixture of equal amounts of water and acetic acid, and the steamed crop straw is mixed with carboxymethyl cellulose, humic acid and bentonite and stirred evenly to obtain a mixture, and the mixture is put into a granulator and water is added to form particles with a particle size of 8 mm, and the particles are mixed with yeast and starch to obtain.

[0049] (3) Replanting management: After the double-bud segments of the replanted plants have grown to 25 cm, the perennial sugarcane seedlings of the adjacent plants should be cut off on the ground.

[0050] Comparative Example 1: In step (2), no root-promoting and water-retaining agent is used, and the other steps are consistent with those in Example 1.

[0051] Comparative Example 2: The root-promoting and water-retaining agent used in step (2) does not contain yeast, and the other steps are consistent with Example 1.

[0052] Comparative Example 3: The root-promoting and water-retaining agent used in step (2) does not contain starch, and the other steps are consistent with Example 1.

[0053] Comparative Example 4: In step (2), the crop straw powder is not subjected to hot steam treatment in the root-promoting and water-retaining agent used, and the other steps are consistent with those in Example 1.

[0054] Comparative Example 5: without step (3), that is, the ratoon sugarcane seedlings of the adjacent plants are not cut off, and the other steps are consistent with those of Example 1.

[0055] In 2023, a replanting test was conducted at the Dingdang Base in Long'an County, Nanning City. The test site is dry land with flat terrain and red soil type with medium fertility. It is the second-year perennial sugarcane field. In February 2023, the previous crop of sugarcane was harvested and the sugarcane leaves and residues were cleaned. Replanting was arranged in March, soil was cultivated at the end of May, and harvesting and yield measurement were carried out in February 2024.

[0056] The experiment set up 8 treatments and 1 blank control. Treatments 1 to 3 were replanted using the methods of Examples 1 to 3, respectively. Treatments 4 to 8 were replanted using the methods of Comparative Examples 1 to 5, respectively. The blank control: the original sugarcane field was maintained without replanting. Each treatment was repeated 3 times, with 5 rows per plot, a row length of 7.0 m, a row spacing of 1.2 m, and a plot area of ​​42 m 2 , random block arrangement, protection row (row), other management methods are the same. The survival rate of seedlings in each treatment was investigated at the seedling stage. When sugarcane was harvested, 20 plants were randomly sampled from each plot to investigate plant height and stem diameter. The number of effective stems and sugarcane stem yield of the plot were actually calculated. The results are shown in Table 1:

[0057] Table 1 Treatment results

[0058]

[0059] The data in Table 1 show that the survival rates of treatments 1 to 3 are all above 75%, and from the comparison between treatments 1 and treatments 4 to 8, it can be seen that the application of root-promoting and water-retaining agents during replanting and the cutting off of neighboring perennial sugarcane seedlings on the ground after replanting have a great influence on the survival rate of replanting, the number of effective stems and the yield. The present invention adopts the method of applying root-promoting and water-retaining agents during replanting and cutting off neighboring perennial sugarcane seedlings on the ground after replanting, achieving a survival rate of replanted seedlings of more than 75% and a yield of up to 87000 kg / hm 2 The above, and replanting is not limited by water conditions, only watering once when planting, no need for repeated watering, saving costs.

[0060] In summary, the present invention solves the problems of inconvenient replanting location positioning, inconsistent growth between replanting seedlings and original perennial sugarcane seedlings, low survival rate, and replanting being easily restricted by water conditions by adopting a series of technical means such as a replanting positioning device, applying a root-promoting water-retaining agent during replanting, and cutting off the neighboring perennial sugarcane seedlings on the ground after replanting. The method of the present invention can easily find the replanting location, and a planting pit can be dug at the replanting location. Replanting is not restricted by water conditions. Watering is only required once during planting, and repeated watering is not required. The survival rate of the replanted seedlings can be as high as 75% or more. At the same time, the growth of the replanted seedlings is not restricted by the original seedlings, and can grow synchronously with the original seedlings. The plant height, stem diameter, number of effective stems and yield of the replanted seedlings at maturity are all higher than those of the traditional replanting method.

[0061] 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 replanting to extend the age of sugarcane perennial roots, characterized in that: The following steps are involved: (1) Determining the position of the seedling replacement: The position of the seedling replacement is determined by using a seedling replacement positioning device, that is, when the spacing between the missing seedlings between two sugarcane bags in a row is 50-60 cm, the seedling replacement position is set at the midpoint of the spacing between the missing seedlings. When the spacing between the missing seedlings increases by 50-60 cm, a seedling replacement position is added at the midpoint of the increased spacing; (2) Replanting: Select shade-tolerant sugarcane varieties suitable for replanting, cut the upper bud segments into double bud segments, and plant them at the replanting location after soaking and coating. Apply root-promoting and water-retaining agents during planting, and dig holes in the empty space between the sugarcane rows away from the replanting location for fertilizer application; (3) Replanting management: After the double-bud segments of the replanted plants have grown to 20-30 cm, the perennial sugarcane seedlings of the adjacent plants should be cut off on the ground.

2. A replanting method for extending the perennial root life of sugarcane according to claim 1, characterized in that: In step (1), the seedling positioning device includes a shell, a drill rod, a measuring rod and a handle; a motor, a rechargeable battery and a controller are arranged in the shell, and the controller is electrically connected to the motor and the rechargeable battery respectively; the handle is arranged at the left and right ends of the shell and is fixedly connected to the shell, and a button is arranged on the handle, and the button is electrically connected to the controller, and the button controls the power on and off and forward and reverse rotation of the motor; one end of the drill rod is connected to the output shaft of the motor, and the other end is provided with a drill bit; the measuring rod has a length of 50-60 cm, and the measuring rod is vertically fixed on the drill rod and is divided into two equal parts by the drill rod, the measuring rod is parallel to the handle, and the vertical distance between the drill bit and the measuring rod is 15-20 cm.

3. A replanting method for extending the age of sugarcane ratoons according to claim 1, characterized in that: In step (2), the hole digging and fertilizing is as follows: digging a small hole with a length and width of 5-10 cm and a depth of 20-30 cm, applying the decomposed farmyard manure, covering with soil and irrigating with water.

4. A replanting method for extending the age of sugarcane perennial roots according to claim 1, characterized in that: In step (2), the shade-tolerant sugarcane variety is Guitang 49 or Guitang 47.

5. A replanting method for extending the age of sugarcane ratoon roots according to claim 1, characterized in that: In step (2), the seed soaking and coating treatment is as follows: first, the double-bud stem segment is soaked in clean water for 1-2 hours, after being fished out, the surface moisture is dried in the shade, and then soaked in the seed soaking liquid for 10-20 minutes.

6. A replanting method for extending the age of sugarcane ratoon roots according to claim 5, characterized in that: The seed soaking solution comprises: 60-90 parts of Kangpu Engen Duoduo, 10-17 parts of chitosan oligosaccharide, 15-30 parts of 50% benomyl powder, 20-25 parts of avermectin, 20-30 parts of polyethylene glycol and 9000-10000 parts of water.

7. A replanting method for extending the age of sugarcane ratoon roots according to claim 1, characterized in that: In step (3), the root-promoting and water-retaining agent comprises 10-18 parts of carboxymethyl cellulose, 26-33 parts of humic acid, 12-24 parts of bentonite, 30-45 parts of yeast, 40-58 parts of starch and 30-38 parts of crop straw.

8. A replanting method for extending the age of sugarcane ratoon roots according to claim 7, characterized in that: The preparation method of the root-promoting water-retaining agent is as follows: firstly, the crop straw is crushed into 3-5 mm fragments, and then steamed under hot steam for 1-2 hours, and the steamed crop straw is mixed with carboxymethyl cellulose, humic acid and bentonite to obtain a mixture, and the mixture is put into a granulator and water is added to form particles with a particle size of 5-8 mm, and the particles are mixed with yeast and starch to obtain the mixture.

9. A replanting method for extending the age of sugarcane perennial roots according to claim 8, characterized in that: The hot steam is obtained by evaporating a mixture of equal amounts of water and acetic acid through heating.

10. A replanting method for extending the age of sugarcane ratoon roots according to claim 1, characterized in that: In step (3), the planting is as follows: firstly, the root-promoting and water-retaining agent is placed in a pit dug at the replanting location, and then the double-bud segments treated with seed soaking and coating are placed therein, the soil is compacted, and sufficient water is poured to allow the roots to take root.

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