A planting method for promoting sugarcane tillering by using hemp water and hemp residue

Abstract

The application provides a planting method for promoting sugarcane tillering by using hemp water and hemp residue, comprising the following steps: (1) land preparation and seeding: land preparation and ditching are performed, and mature farmyard manure, calcium-magnesium phosphate fertilizer and compound fertilizer are applied in the sugarcane ditch; after the sugarcane seeds are soaked and coated, the seeds are planted in the sugarcane ditch, and modified hemp residue is placed between the intervals of each adjacent sugarcane seed; (2) field management: when the sugarcane seedlings grow to 6-7 true leaves, the modified hemp residue is scattered around the seedlings, and tillering compound fertilizer is sprayed; after 5-10 days, hemp water foliar fertilizer is sprayed again; during the tillering vigorous period, tillering foliar fertilizer is sprayed, and after the spraying is completed, middle cultivation is performed; after 5-10 days, hemp water foliar fertilizer is sprayed again. The application can better utilize hemp water and hemp residue, and can effectively promote sugarcane tillering and improve the effective tiller number of sugarcane.

Description

Technical Field

[0001] This invention relates to the field of comprehensive utilization technology of sisal waste, and in particular to a planting method that uses sisal water and sisal residue to promote sugarcane tillering. Background Technology

[0002] Sisal is a perennial tropical hard-leaved fiber crop that not only has ornamental value but also plays an important role in many fields. For example, due to its tough and wear-resistant fiber, it is often used to make ropes and weaving materials. In addition, sisal is rich in a variety of active ingredients, including various saponins, proteins, and polysaccharides, which have anti-inflammatory, antibacterial, antiviral, and antitumor effects.

[0003] Sisal is generally used after the sisal fiber is extracted. The specific process includes: crushing and scraping the pulp of the sisal leaves, then washing them with running water to extract the sisal fiber. In this process, a large amount of sisal water and sisal residue are generated. How to reuse the sisal water and sisal residue has become an urgent problem to be solved. Summary of the Invention

[0004] This invention provides a planting method that utilizes hemp water and hemp residue to promote sugarcane tillering, which can better utilize hemp water and hemp residue and effectively promote sugarcane tillering, thereby increasing the number of effective tillers in sugarcane.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A planting method that utilizes hemp water and hemp residue to promote sugarcane tillering includes the following steps:

[0007] (1) Land preparation and planting: Prepare the land and dig ditches. Apply 1500-2000 kg / mu of well-rotted farmyard manure, 5-10 kg / mu of calcium magnesium phosphate fertilizer, and 60-70 kg / mu of compound fertilizer to the sugarcane ditches. After soaking the sugarcane seeds in the coating agent, plant them in the sugarcane ditches. The planting amount is 3200-4500 buds / mu. Place 3-5g of modified hemp residue between each adjacent sugarcane seed.

[0008] (2) Field management: When the sugarcane seedlings grow to 6-7 true leaves, spread modified hemp residue with a thickness of 2-3cm and a radius of 8-15cm around the seedlings, spray 3-4kg / mu of tillering compound fertilizer, and carry out small hilling after spraying. 5-10 days later, spray 20-30kg / mu of hemp water foliar fertilizer. During the vigorous tillering period, spray 3-4 kg / mu of tillering foliar fertilizer, carry out medium hilling after spraying, and 5-10 days later, spray 40-50kg / mu of hemp water foliar fertilizer.

[0009] Preferably, the preparation method of the hemp water foliar fertilizer includes the following steps: taking fresh hemp water, adding slaked lime, and adjusting the pH to 6.0-7.2 to obtain pretreated hemp water; adding waste molasses and a biological fermentation agent to the pretreated hemp water for primary fermentation, wherein the biological fermentation agent is prepared by Bacillus subtilis, Bacillus mucilaginosus, Azotobacter chrysogenum, and Saccharomyces cerevisiae in a weight ratio of 10-20:5-10:5-10:3-5, and the amount used is 0.02-0.06% of the weight of the pretreated hemp water, and the fermentation time is 10-12 days; after the primary fermentation is completed, adding 0.01-0.02% of the weight of Trichoderma harzianum to the pretreated hemp water for secondary fermentation, and the fermentation time is 2-3 days; after the secondary fermentation is completed, obtaining hemp water that has undergone secondary fermentation; adding 0.2-0.5% of the weight of ferrous sulfate to the hemp water that has undergone secondary fermentation, stirring evenly, to obtain hemp water foliar fertilizer;

[0010] Preferably, the method for preparing the modified hemp residue includes the following steps:

[0011] S1. Take the hemp water, add fermentation agents including lactic acid bacteria, and ferment for 10-15 days. Adjust the pH to 5-6 to obtain hemp water fermented with lactic acid bacteria.

[0012] S2. Take the dried hemp residue, add 20-50 times its weight of hemp water fermented with lactic acid bacteria, soak for 24-48 hours, then add sodium dodecyl sulfate, controlling the mass concentration of sodium dodecyl sulfate to 1-2%, and then add sodium carbonate while stirring, the weight of sodium carbonate being 0.1-0.3% of the weight of hemp water fermented with lactic acid bacteria. After the sodium carbonate has fully reacted, add triethanolamine to control the pH of the reaction system at 6.0-6.5, stir or shake for 4-6 hours, separate the hemp residue, dry it, and obtain the modified hemp residue.

[0013] Preferably, step S1 specifically includes: taking fresh hemp water, adding slaked lime, adjusting the pH to 6.0-7.2 to obtain alkalized hemp water, adding Bacillus subtilis, Bacillus mucilaginosus inoculum and Azotobacter chrysogenum for aerobic fermentation, the weight ratio of Bacillus subtilis, Bacillus mucilaginosus inoculum and Azotobacter chrysogenum is 10-20:5-10:5-10, the amount is 0.02-0.06% of the weight of the alkalized hemp water, the fermentation time is 8-10 days, after the aerobic fermentation is completed, adding 0.01-0.02% of the weight of the alkalized hemp water for anaerobic fermentation, the lactic acid bacteria are composed of Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus casei and Pediococcus lactis mixed in a weight ratio of 2-5:8-15:6-12:2-5, adjusting the pH to 5-6, to obtain hemp water fermented with lactic acid bacteria.

[0014] Preferably, in step (1), the ratio of N:P:K in the compound fertilizer is 15:15:15.

[0015] Preferably, in step (1), the coating agent is composed of the following components in parts by weight: 0.2-0.5 parts of paclobutrazol, 0.3-0.6 parts of γ-polyglutamic acid, 0.05-0.1 parts of imazalil, 0.05-0.1 parts of carbendazim, 2-10 parts of surfactant, 1-3 parts of binder, and 1000 parts of water.

[0016] More preferably, in the coating agent, the surfactant is one or two of polyoxyethylene alkyl ether and polyethylene glycol octylphenyl ether, and the adhesive is a cellulose derivative adhesive.

[0017] Preferably, in step (2), the N:P:K ratio in the tillering compound fertilizer is 3-5:1:2-3, and it is diluted with water 600-800 times when sprayed, and 0.001%-0.002% abscisic acid is added.

[0018] Preferably, in step (2), the foliar fertilizer contains macronutrients at a weight percentage of not less than 75%, N:P:K ratio of 5-7:1:3-4, mesonutrients at a weight percentage of 10-15%, and micronutrients at a weight percentage of 1-3%, and is diluted with water 500-600 times when spraying.

[0019] Preferably, the modified hemp residue includes long hemp residue and short hemp residue, wherein the length of the long hemp residue is 2-4 mm, the length of the short hemp residue is no more than 1 mm, and the weight ratio of the long hemp residue to the short hemp residue is 40-50:50-60.

[0020] The planting method described above, which utilizes hemp water and hemp residue to promote sugarcane tillering, has the following advantages;

[0021] (1) The present invention uses appropriate base fertilizer, as well as topdressing composed of compound fertilizer, foliar fertilizer and hemp water, to provide sufficient nutrients for sugarcane tillering, promote sugarcane root growth, enhance sugarcane resistance, increase the number of effective tillers of sugarcane, and at the same time make the sugarcane stem thicker.

[0022] (2) The present invention modifies sisal residue by first soaking it in water to make the surface of the sisal residue rich in hydroxyl and carboxyl groups and soften it. Then, the pore structure of the sisal residue is enhanced by surfactant and sodium carbonate. Finally, the organic alkali is inserted into the pore structure of the sisal residue and fully grafted and cross-linked with the free hydroxyl and carboxyl groups to obtain modified sisal residue with better hydrophilicity, softness and higher porosity. It can better adsorb fertilizer, enhance water retention performance, reduce nutrient and soil loss, and thus continuously provide nutrients for sugarcane growth during the germination, seedling and tillering stages, and ensure soil permeability to better promote sugarcane tillering.

[0023] (3) The present invention uses appropriate foliar fertilizer of hemp water during the tillering stage of sugarcane, ferments hemp water with appropriate strains, and introduces Trichoderma harzianum to reduce the content of harmful microorganisms in hemp water. It can also induce sugarcane seedlings to enhance the plant’s disease resistance through their own defense mechanism, resist sugarcane diseases, and promote healthy growth of sugarcane.

[0024] (4) Both sisal and sugarcane are widely grown crops in Guangxi. Reusing sisal waste can better reduce planting costs and increase the economic value of crops. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0026] The following examples used Guitang 42 sugarcane as the sugarcane variety. The test site was located in Nanning, and the planting time was March 2024. The test area for each example and comparative example was 1 mu (approximately 0.16 acres). Example 1

[0027] A planting method that utilizes hemp water and hemp residue to promote sugarcane tillering includes the following steps:

[0028] (1) Land preparation and planting: Prepare the land and dig ditches. Apply 2000 kg / mu of decomposed farmyard manure, 8 kg / mu of calcium magnesium phosphate fertilizer and 65 kg / mu of compound fertilizer to the sugarcane ditches. After soaking the sugarcane seeds in the coating agent, plant them in the sugarcane ditches. The planting amount is 3500 buds / mu. Put 5g of modified hemp residue between each adjacent sugarcane seed.

[0029] (2) Field management: When the sugarcane seedlings grow to 6-7 true leaves, spread modified hemp residue with a thickness of 3cm and a radius of 10cm around the seedlings, spray 3.5kg / mu of tillering compound fertilizer, and carry out small hilling after spraying. After 7 days, spray 30kg / mu of hemp water foliar fertilizer. During the vigorous tillering period, spray 3.5kg / mu of tillering foliar fertilizer, carry out medium hilling after spraying, and spray 50kg / mu of hemp water foliar fertilizer after 7 days.

[0030] Preferably, the preparation method of hemp water foliar fertilizer includes the following steps: Take fresh hemp water, add slaked lime, and adjust the pH to 6.5 to obtain pretreated hemp water; add waste molasses and biological fermentation agent to the pretreated hemp water for primary fermentation, wherein the amount of waste molasses is 0.003% of the weight of the pretreated hemp water, and the biological fermentation agent is made of Bacillus subtilis, Bacillus mucilaginosus, Azotobacter chrysogenum, and Saccharomyces cerevisiae in a weight ratio of 18:8:6:5, and the amount is 0.05% of the weight of the pretreated hemp water, and the fermentation time is 10 days; after the primary fermentation is completed, add 0.02% of the weight of Trichoderma harzianum to the pretreated hemp water for secondary fermentation, and the fermentation time is 3 days; after the secondary fermentation is completed, obtain hemp water that has undergone secondary fermentation; add 0.5% of the weight of ferrous sulfate to the hemp water that has undergone secondary fermentation, stir evenly, and obtain hemp water foliar fertilizer;

[0031] Preferably, the preparation method of the modified hemp residue includes the following steps: S1. Take fresh hemp water, add quicklime, adjust the pH to 6.5 to obtain alkalized hemp water, add Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus inoculants for aerobic fermentation. The weight ratio of Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus inoculants is 18:8:10, and the amount is 0.05% of the weight of the alkalized hemp water. The fermentation time is 9 days. After the aerobic fermentation is completed, add 0.02% of the weight of lactic acid bacteria from the alkalized hemp water for anaerobic fermentation. The lactic acid bacteria are Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus casei, and Pediococcus lactis in a weight ratio of 5:10:1. The mixture was prepared in a 0:5 ratio and fermented for 5 days. After fermentation, the pH was adjusted to 5.8 to obtain lactic acid bacteria fermented hemp water. S2. The dried hemp residue was taken and 30 times its weight of lactic acid bacteria fermented hemp water was added. After soaking for 48 hours, sodium dodecyl sulfate was added, and the mass concentration of sodium dodecyl sulfate was controlled at 1.8%. Then, sodium carbonate was added under stirring. The weight of sodium carbonate was 0.2% of the weight of lactic acid bacteria fermented hemp water. After the sodium carbonate reacted fully, triethanolamine was added to control the pH of the reaction system at 6.5. The reaction was shaken for 5 hours. The hemp residue was separated, dried, and the modified hemp residue was obtained.

[0032] In step (1), the N:P:K ratio in the compound fertilizer is 15:15:15. The coating agent consists of the following components in parts by weight: 0.5 parts paclobutrazol, 0.5 parts γ-polyglutamic acid, 0.08 parts imazalil, 0.08 parts carbendazim, 8 parts polyoxyethylene alkyl ether, 2.5 parts sodium carboxymethyl cellulose, and 1000 parts water.

[0033] In step (2), the N:P:K ratio in the tillering compound fertilizer is 4:1:2. It is diluted 800 times with water before spraying and 0.001% abscisic acid is added. In the foliar fertilizer, the weight percentage of macroelements is 80%, the N:P:K ratio is 6:1:4, the weight percentage of mesoelements is 15%, the weight percentage of microelements is 2%, and the remainder contains chitosan and other excipients. It is diluted 600 times with water before spraying.

[0034] Preferably, the modified hemp residue includes long hemp residue and short hemp residue, the length of the long hemp residue is 2-4 mm, the length of the short hemp residue is no more than 1 mm, and the weight ratio of long hemp residue to short hemp residue is 40:60. Example 2

[0035] A planting method that utilizes hemp water and hemp residue to promote sugarcane tillering includes the following steps:

[0036] (1) Land preparation and planting: Prepare the land and dig ditches. Apply 1800 kg / mu of decomposed farmyard manure, 8 kg / mu of calcium magnesium phosphate fertilizer and 70 kg / mu of compound fertilizer to the sugarcane ditches. After soaking the sugarcane seeds in the coating agent, plant them in the sugarcane ditches. The planting amount is 3500 buds / mu. Put 4g of modified hemp residue between each adjacent sugarcane seed.

[0037] (2) Field management: When the sugarcane seedlings grow to 6-7 true leaves, spread modified hemp residue with a thickness of 2cm and a radius of 15cm around the seedlings, spray 4kg / mu of tillering compound fertilizer, and carry out small hilling after spraying. After 7 days, spray 20kg / mu of hemp water foliar fertilizer. During the vigorous tillering period, spray 4kg / mu of tillering foliar fertilizer, carry out medium hilling after spraying, and spray 40kg / mu of hemp water foliar fertilizer after 7 days.

[0038] Preferably, the preparation method of hemp water foliar fertilizer includes the following steps: Take fresh hemp water, add slaked lime, and adjust the pH to 6.5 to obtain pretreated hemp water; add waste molasses and biological fermentation agent to the pretreated hemp water for primary fermentation, wherein the amount of waste molasses is 0.004% of the weight of the pretreated hemp water, and the biological fermentation agent is made of Bacillus subtilis, Bacillus mucilaginosus, Azotobacter chrysogenum, and Saccharomyces cerevisiae in a weight ratio of 10:10:10:3, and the amount is 0.06% of the weight of the pretreated hemp water, and the fermentation time is 10 days; after the primary fermentation is completed, add 0.01% of the weight of Trichoderma harzianum to the pretreated hemp water for secondary fermentation, and the fermentation time is 3 days; after the secondary fermentation is completed, obtain hemp water that has undergone secondary fermentation; add 0.5% of the weight of ferrous sulfate to the hemp water that has undergone secondary fermentation, stir evenly, and obtain hemp water foliar fertilizer;

[0039] Preferably, the preparation method of the modified hemp residue includes the following steps: S1. Take fresh hemp water, add slaked lime, adjust the pH to 6.8 to obtain alkalized hemp water, add Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus inoculants for aerobic fermentation, the weight ratio of Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus inoculants is 10:10:10, the amount is 0.05% of the weight of alkalized hemp water, the fermentation time is 9 days, after the aerobic fermentation is completed, add 0.02% of the weight of alkalized hemp water with lactic acid bacteria for anaerobic fermentation, the lactic acid bacteria are Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus casei, and Pediococcus lactis in a weight ratio of 2:8: The mixture was prepared in a 6:5 ratio and fermented for 5 days. After fermentation, the pH was adjusted to 5.5 to obtain lactic acid bacteria fermented hemp water. S2. The dried hemp residue was taken and 35 times its weight of lactic acid bacteria fermented hemp water was added. After soaking for 48 hours, sodium dodecyl sulfate was added, and the mass concentration of sodium dodecyl sulfate was controlled at 1.5%. Then, sodium carbonate was added under stirring. The weight of sodium carbonate was 0.2% of the weight of lactic acid bacteria fermented hemp water. After the sodium carbonate reacted fully, triethanolamine was added to control the pH of the reaction system at 6.3. The reaction was shaken for 5 hours. The hemp residue was separated, dried, and the modified hemp residue was obtained.

[0040] In step (1), the N:P:K ratio in the compound fertilizer is 15:15:15. The coating agent consists of the following components in parts by weight: 0.3 parts paclobutrazol, 0.6 parts γ-polyglutamic acid, 0.05 parts imazalil, 0.1 parts carbendazim, 8 parts polyethylene glycol octylphenyl ether, 3 parts sodium carboxymethyl cellulose, and 1000 parts water.

[0041] In step (2), the N:P:K ratio in the tillering compound fertilizer is 4:1:2. It is diluted 800 times with water before spraying and 0.001% abscisic acid is added. In the foliar fertilizer, the weight percentage of macroelements is 80%, the N:P:K ratio is 6:1:4, the weight percentage of mesoelements is 15%, the weight percentage of microelements is 2%, and the remainder contains chitosan and other excipients. It is diluted 600 times with water before spraying.

[0042] Preferably, the modified hemp residue includes long hemp residue and short hemp residue, the length of the long hemp residue is 2-4 mm, the length of the short hemp residue is no more than 1 mm, and the weight ratio of long hemp residue to short hemp residue is 50:50. Example 3

[0043] A planting method that utilizes hemp water and hemp residue to promote sugarcane tillering includes the following steps:

[0044] (1) Land preparation and planting: Prepare the land and dig ditches. Apply 1500 kg / mu of decomposed farmyard manure, 10 kg / mu of calcium magnesium phosphate fertilizer and 70 kg / mu of compound fertilizer to the sugarcane ditches. After soaking the sugarcane seeds in the coating agent, plant them in the sugarcane ditches. The planting amount is 3500 buds / mu. Put 5g of modified hemp residue between each adjacent sugarcane seed.

[0045] (2) Field management: When the sugarcane seedlings grow to 6-7 true leaves, spread modified hemp residue with a thickness of 2cm and a radius of 15cm around the seedlings, spray 3kg / mu of tillering compound fertilizer, and carry out small hilling after spraying. After 7 days, spray 30kg / mu of hemp water foliar fertilizer. During the vigorous tillering period, spray 3kg / mu of tillering foliar fertilizer, carry out medium hilling after spraying, and spray 45kg / mu of hemp water foliar fertilizer after 7 days.

[0046] Preferably, the preparation method of hemp water foliar fertilizer includes the following steps: Take fresh hemp water, add slaked lime, and adjust the pH to 6.5 to obtain pretreated hemp water; add waste molasses and biological fermentation agent to the pretreated hemp water for primary fermentation, wherein the amount of waste molasses is 0.003% of the weight of the pretreated hemp water, and the biological fermentation agent is made of Bacillus subtilis, Bacillus mucilaginosus, Azotobacter chrysogenum, and Saccharomyces cerevisiae in a weight ratio of 20:10:5:5, and the amount is 0.03% of the weight of the pretreated hemp water, and the fermentation time is 12 days; after the primary fermentation is completed, add 0.02% of the weight of Trichoderma harzianum to the pretreated hemp water for secondary fermentation, and the fermentation time is 3 days; after the secondary fermentation is completed, obtain hemp water that has undergone secondary fermentation; add 0.3% of the weight of ferrous sulfate to the hemp water that has undergone secondary fermentation, stir evenly, and obtain hemp water foliar fertilizer;

[0047] Preferably, the preparation method of the modified hemp residue includes the following steps: S1. Take fresh hemp water, add slaked lime, adjust the pH to 6.8 to obtain alkalized hemp water, add Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus inoculants for aerobic fermentation. The weight ratio of Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus inoculants is 20:5:5, and the amount is 0.03% of the weight of the alkalized hemp water. The fermentation time is 10 days. After the aerobic fermentation is completed, add 0.02% of the weight of lactic acid bacteria from the alkalized hemp water for anaerobic fermentation. The lactic acid bacteria are Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus casei, and Pediococcus lactis in a weight ratio of 5:15: The mixture was prepared in a 12:5 ratio and fermented for 5 days. After fermentation, the pH was adjusted to 5.5 to obtain lactic acid bacteria fermented hemp water. S2. The dried hemp residue was taken and 35 times its weight of lactic acid bacteria fermented hemp water was added. After soaking for 48 hours, sodium dodecyl sulfate was added, and the mass concentration of sodium dodecyl sulfate was controlled at 1%. Then, sodium carbonate was added under stirring. The weight of sodium carbonate was 0.2% of the weight of lactic acid bacteria fermented hemp water. After the sodium carbonate reacted fully, triethanolamine was added to control the pH of the reaction system at 6.5. The reaction was shaken for 5 hours. The hemp residue was separated, dried, and the modified hemp residue was obtained.

[0048] In step (1), the N:P:K ratio in the compound fertilizer is 15:15:15. The coating agent consists of the following components in parts by weight: 0.5 parts paclobutrazol, 0.6 parts γ-polyglutamic acid, 0.05 parts imazalil, 0.1 parts carbendazim, 8 parts polyethylene glycol octylphenyl ether, 3 parts sodium carboxymethyl cellulose, and 1000 parts water.

[0049] In step (2), the N:P:K ratio in the tillering compound fertilizer is 4:1:2. It is diluted 800 times with water before spraying and 0.001% abscisic acid is added. In the foliar fertilizer, the weight percentage of macroelements is 80%, the N:P:K ratio is 6:1:4, the weight percentage of mesoelements is 15%, the weight percentage of microelements is 2%, and the remainder contains chitosan and other excipients. It is diluted 600 times with water before spraying.

[0050] Preferably, the modified hemp residue includes long hemp residue and short hemp residue, the length of the long hemp residue is 2-4 mm, the length of the short hemp residue is no more than 1 mm, and the weight ratio of long hemp residue to short hemp residue is 50:50.

[0051] Comparative Example 1

[0052] Comparative Example 1 is basically the same as Example 1, but in step (1), no modified hemp residue was placed between adjacent sugarcane seeds, and in step (2), no modified hemp residue was sprinkled around the seedlings.

[0053] Comparative Example 2

[0054] Comparative Example 2 is basically the same as Example 1, except that in step (2), no foliar fertilizer was sprayed.

[0055] Comparative Example 3

[0056] Comparative Example 2 was basically the same as Example 1, but the modified hemp residue was not used, and hemp water foliar fertilizer was not sprayed.

[0057] The above-described embodiments and comparative examples of planting methods were used to investigate the sugarcane emergence rate, number of effective stems, average stem diameter (maturity stage), average plant height (maturity stage), and yield. The results are shown in Table 1.

[0058]

Claims

1. A planting method for promoting sugarcane tillering using hemp water and hemp residue, characterized in that... Includes the following steps: (1) Land preparation and planting: Prepare the land and dig ditches. Apply 1500-2000 kg / mu of well-rotted farmyard manure, 5-10 kg / mu of calcium magnesium phosphate fertilizer, and 60-70 kg / mu of compound fertilizer to the sugarcane ditches. After soaking the sugarcane seeds in the coating agent, plant them in the sugarcane ditches. The planting amount is 3200-4500 buds / mu. Place 3-5g of modified hemp residue between each adjacent sugarcane seed. (2) Field management: When the sugarcane seedlings grow to 6-7 true leaves, spread modified hemp residue with a thickness of 2-3cm and a radius of 8-15cm around the seedlings, spray 3-4kg / mu of tillering compound fertilizer, and carry out small hilling after spraying. 5-10 days later, spray 20-30kg / mu of hemp water foliar fertilizer; during the vigorous tillering period, spray 3-4 kg / mu of tillering foliar fertilizer, carry out medium hilling after spraying, and 5-10 days later, spray 40-50kg / mu of hemp water foliar fertilizer. The preparation method of the hemp water foliar fertilizer includes the following steps: Take fresh hemp water, add slaked lime, and adjust the pH to 6.0-7.2 to obtain pretreated hemp water; add waste molasses and biological fermentation agent to the pretreated hemp water for primary fermentation, wherein the biological fermentation agent is prepared by Bacillus subtilis, Bacillus mucilaginosus, Azotobacter chrysogenum, and Saccharomyces cerevisiae in a weight ratio of 10-20:5-10:5-10:3-5, and the amount used is 0.02-0.06% of the weight of the pretreated hemp water, and the fermentation time is 10-12 days; after the primary fermentation is completed, add 0.01-0.02% of the weight of Trichoderma harzianum to the pretreated hemp water for secondary fermentation, and the fermentation time is 2-3 days; after the secondary fermentation is completed, obtain hemp water that has undergone secondary fermentation; add 0.2-0.5% of the weight of ferrous sulfate to the hemp water that has undergone secondary fermentation, stir evenly, and obtain hemp water foliar fertilizer; The method for preparing the modified hemp residue includes the following steps: S1. Take the hemp water, add fermentation agents including lactic acid bacteria, and ferment for 10-15 days. Adjust the pH to 5-6 to obtain hemp water fermented with lactic acid bacteria. S2. Take the dried hemp residue, add 20-50 times its weight of hemp water fermented with lactic acid bacteria, soak for 24-48 hours, then add sodium dodecyl sulfate, controlling the mass concentration of sodium dodecyl sulfate to 1-2%, and then add sodium carbonate while stirring, the weight of sodium carbonate being 0.1-0.3% of the weight of hemp water fermented with lactic acid bacteria. After the sodium carbonate has fully reacted, add triethanolamine to control the pH of the reaction system at 6.0-6.5, stir or shake for 4-6 hours, separate the hemp residue, dry it, and obtain the modified hemp residue.

2. The planting method for promoting sugarcane tillering using hemp water and hemp residue according to claim 1, characterized in that: Step S1 specifically includes: taking fresh hemp water, adding slaked lime, adjusting the pH to 6.0-7.2 to obtain alkalized hemp water, adding Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus for aerobic fermentation, with the weight ratio of Bacillus subtilis, Bacillus mucilaginosus, and Azotobacter chrysogenus being 10-20:5-10:5-10, and the amount used being 0.02-0.06% of the weight of the alkalized hemp water, and the fermentation time being 8-10 days. After the aerobic fermentation is completed, adding 0.01-0.02% of the weight of the alkalized hemp water to carry out anaerobic fermentation. The lactic acid bacteria are composed of Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus casei, and Pediococcus lactis mixed in a weight ratio of 2-5:8-15:6-12:2-5. After the fermentation is completed, adjusting the pH to 5-6 to obtain hemp water fermented with lactic acid bacteria.

3. The planting method for promoting sugarcane tillering using hemp water and hemp residue according to claim 1, characterized in that: In step (1), the ratio of N:P:K in the compound fertilizer is 15:15:

15.

4. The planting method for promoting sugarcane tillering using hemp water and hemp residue according to claim 1, characterized in that: In step (1), the coating agent is composed of the following components in parts by weight: 0.2-0.5 parts of paclobutrazol, 0.3-0.6 parts of γ-polyglutamic acid, 0.05-0.1 parts of imazalil, 0.05-0.1 parts of carbendazim, 2-10 parts of surfactant, 1-3 parts of binder, and 1000 parts of water.

5. The planting method for promoting sugarcane tillering using hemp water and hemp residue according to claim 4, characterized in that: In the coating agent, the surfactant is one or both of polyoxyethylene alkyl ether and polyethylene glycol octylphenyl ether, and the binder is a cellulose derivative binder.

6. The planting method for promoting sugarcane tillering using hemp water and hemp residue according to claim 1, characterized in that: In step (2), the N:P:K ratio in the tillering compound fertilizer is 3-5:1:2-3. When spraying, it is diluted with water 600-800 times and 0.001%-0.002% abscisic acid is added.

7. The planting method for promoting sugarcane tillering using hemp water and hemp residue according to claim 1, characterized in that: In step (2), the foliar fertilizer for tillering contains macronutrients at a weight percentage of not less than 75%, N:P:K ratio of 5-7:1:3-4, mesonutrients at a weight percentage of 10-15%, and micronutrients at a weight percentage of 1-3%. It is diluted with water 500-600 times when spraying.

8. The planting method for promoting sugarcane tillering using hemp water and hemp residue according to claim 1, characterized in that: The modified hemp residue includes long hemp residue and short hemp residue. The length of the long hemp residue is 2-4 mm, and the length of the short hemp residue is no more than 1 mm. The weight ratio of the long hemp residue to the short hemp residue is 40-50:50-60.

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