A chlorine dioxide sustained-release granule and a method for synergistically improving continuous cropping obstacle soil thereof with probiotics

Abstract

This application relates to the technical field of agricultural soil remediation, and relates to a chlorine dioxide slow-release granule and a method for synergistically improving continuous cropping obstacle soil with probiotics. Specifically, a chlorine dioxide slow-release granule is disclosed, which comprises 20-50 parts of chlorite; 10-50 parts of acidifying agent; 2-20 parts of desiccant; 1-10 parts of stabilizer; 5-20 parts of slow-release agent; 1-5 parts of binder. The chlorine dioxide slow-release granule prepared in this application has a faster, more efficient and more environmentally friendly effect than common pesticide bactericides, and at the same time provides measures to restore the healthy microbial environment of the soil. It can be directly applied by manual or drone operation, which is more convenient to use than traditional dosage forms and is conducive to the implementation of large-area operations. The continuous cropping obstacle soil improved by this method can be restored for continuous cropping for 2-3 years.

Description

Technical Field

[0001] The present application relates to the technical field of agricultural soil remediation. The present invention relates to a method for improving soil with continuous cropping problems by synergistic chemical and biological methods, and specifically to a method for improving soil with continuous cropping problems by synergistically using chlorine dioxide slow-release particles and probiotics. Background Art

[0002] Continuous cropping soils exist to varying degrees across China, but are particularly widespread in southern my country, where land resources are scarce and the climate is suitable for continuous cropping.

[0003] Continuous cropping disorder soil causes ecological imbalance and deterioration of physical and chemical leaf quality due to continuous planting of the same or closely related crops. When the crops continue to be planted, the soil often suffers from aggravated diseases and pests, abnormal growth and development, reduced yield and deterioration of product quality.

[0004] Compared to healthy soil, soils with continuous cropping problems are more susceptible to soilborne diseases. These diseases are caused by pathogens that live in the soil. When the soil temperature and humidity are ideal, and crop growth is weak and nutrient deficient, the pathogens infect the roots and base of the stem. The infection begins in the capillary roots and, over time, spreads to the lateral roots, taproot, and vascular bundles, disrupting their ability to absorb water and nutrients from the soil, ultimately leading to crop death.

[0005] Common diseases associated with continuous cropping, such as root rot, stem base rot, root-knot nematode disease, bacterial wilt, damping-off, and Verticillium wilt, are caused by soil pathogens. These pathogens live dormant in the soil, infecting crops when temperatures and humidity are favorable, leading to widespread yield losses and reduced crop quality. When the weather turns cold, soil-borne pathogens remain deep in the soil and can also be spread by running water.

[0006] The pathogens of soil-borne diseases can survive and accumulate for long periods of time. The causes are complex, with conventional, combined, latent, and microinfections making control difficult. Currently, disease-resistant varieties are scarce, and available fungicides are limited, resulting in ineffective control. Currently, the primary means of soil-borne disease control is through fungicides, with fungicides primarily used for soil improvement, including thiazolinone, abamectin, oxadipate, kasugamycin, copper acetate, methamectin, dazomet, and chlorobromoisocyanuric acid.

[0007] The disadvantages of the above-mentioned fungicides used for soil improvement are: either the prevention and control effect is not ideal, or the operation cycle is long and the steps are cumbersome, or the agents are toxic to a certain extent and pose a threat to the environment and personnel, or the cost of use is too high and difficult for growers to accept. Summary of the Invention

[0008] In order to solve the above-mentioned disadvantages of the soil improvement fungicides, the present application provides a chlorine dioxide sustained-release granule and a method for synergistically improving continuous cropping obstacle soil with probiotics.

[0009] In the first aspect, the present application provides a chlorine dioxide sustained-release granule, adopting the following technical solution:

[0010] A chlorine dioxide sustained-release granule comprises 20-50 parts of chlorite; 10-50 parts of acidifying agent; 2-20 parts of desiccant; 1-10 parts of stabilizer; 5-20 parts of sustained-release agent; 1-5 parts of binder.

[0011] By adopting the above technical solution, using the chlorine dioxide sustained-release granule is more convenient and accurate than traditional chlorine dioxide tablets, powders, and aqueous solutions. For traditional dosage forms used for soil improvement, solid chlorine dioxide needs to be diluted to the concentration required to inactivate pathogenic bacteria, evenly distributed on the surface layer of the soil, or the chlorine dioxide solution is placed at the irrigation water inlet, and the dilution ratio of chlorine dioxide in the irrigation water is calculated and evenly added to the soil. Its drawback is that the concentration of chlorine dioxide in the soil is not easy to control. Different from chlorine dioxide effervescent tablets, monobasic powders, dibasic powders, and aqueous solutions, the chlorine dioxide sustained-release granule has a small particle size, with a diameter of 3 mm per particle and a weight of 0.2 g. The application process is more convenient. The granules can be evenly scattered on the soil surface by artificial or drone means, and the soil is tilled manually or mechanically to make the granules and the soil evenly mixed. The chlorine dioxide sustained-release granule has a long release time of 48 hours, can effectively kill pathogenic bacteria deep in the continuous cropping obstacle soil, and there is little leakage of chloride ions during the release process.

[0012] Optionally, the stabilizer is a mixture of CaCO3 and Al2O3 with a mass ratio of 1:(2-3), the particle size of CaCO3 is 20-30 nm, and the particle size of Al2O3 is 40-50 nm.

[0013] By adopting the above technical solution, the chlorine dioxide sustained-release granule provides the chlorine dioxide parent raw material from chlorite. During the mixing process with the stabilizer, due to the stabilizer having a nanoscale primary particle size, the chlorite will be completely adsorbed and coated by the stabilizer to form an inert coating film, thus being completely isolated and showing chemical inertness. The present application finds through research that the mixture of CaCO3 and Al2O3 with a specific particle size has less agglomeration between particles compared to a single nanoparticle; it is more conducive to coating chlorate.

[0014] Optionally, the chlorite is one or two of sodium chlorite and potassium chlorite.

[0015] By adopting the above technical solution, the chlorite and the solid acid ionize to generate freely moving chlorite ions and hydrogen ions, and the chlorite ions and hydrogen ions react to produce chlorine dioxide gas molecules, which are bound by the sustained-release agent in the network structure molecules and slowly released into the surrounding soil particles.

[0016] Optionally, the acidifying agent is a mixture of sodium bisulfate and potassium dihydrogen phosphate with a mass ratio of 1:(1.3 - 1.8).

[0017] By adopting the above technical solution, the solid granule agent is made by stabilizing the solid chlorite and solid acid through an auxiliary material technology in one package. When in use, by adding water or absorbing water in the air, the solid acid ionizes H + Thus, the reaction conditions are achieved.

[0018] Optionally, the desiccant is a dehydrated inorganic salt capable of forming a water-bound compound.

[0019] By adopting the above technical solution, the purpose of using the desiccant in this application is to ensure that a chlorine dioxide sustained-release granule does not come into contact with moisture before being scattered into the soil and does not prematurely release chlorine dioxide gas.

[0020] Optionally, the sustained-release agent is an acrylic copolymer resin. The particle size of the acrylic copolymer resin is 30 - 100 mesh, and the water absorption ratio is ≥60 times.

[0021] By adopting the above technical solution, after the acrylic copolymer resin is scattered in the soil, it absorbs moisture in the air, thus achieving the reaction conditions and releasing chlorine dioxide gas. The chlorine dioxide gas can kill more than 90% of the disease-causing microorganisms in the soil within 30 minutes after diffusing in the soil. At the same time, it oxidizes the pesticide residues in the soil and restores the soil health.

[0022] Optionally, the preparation method of the sustained-release chlorine dioxide soil disinfection granule is as follows: first mix the chlorite and the stabilizer for 10 - 15 minutes; then add the desiccant and continue to mix for 10 - 15 minutes; finally add the acidifying agent, the sustained-release agent, and the binder and mix for 10 - 15 minutes to obtain a mixed material, and the mixed material is made into a sustained-release chlorine dioxide soil disinfection granule by dry granulation.

[0023] By adopting the above technical solution, after the chlorine dioxide sustained-release granule is scattered in the soil, it absorbs moisture in the air, thus achieving the reaction conditions and releasing chlorine dioxide gas. The chlorine dioxide gas can kill more than 90% of the disease-causing microorganisms in the soil within 30 minutes after diffusing in the soil. At the same time, it oxidizes the pesticide residues in the soil and restores the soil health. Due to its gaseous property and unstable chemical nature, the disinfected chlorine dioxide can be decomposed into chloride ions and oxygen ions within 5 days under natural conditions, which is harmless to the environment and organisms. After the chlorine dioxide decomposes, probiotics are added to the soil to restore the soil biological health.

[0024] The chlorine dioxide sustained-release granule dosage form has the characteristics of small particle size, large number of particles, high content of active ingredients and long-term slow release. For the one-component powder application, since it is too dispersed, for this reactive agent of chlorine dioxide, it is impossible to aggregate the solid acid raw material around the powder raw material, and it is difficult to form an effective acidic reaction condition, so that the chlorine dioxide component cannot be fully released. For the conventional dosage forms such as the traditional two-component packaged chlorine dioxide aqueous solution, tablets, powders, etc., it is necessary to first activate them into an aqueous solution and then spray or irrigate. The operation workload is too cumbersome, and a large amount of water is required to ensure that the solution penetrates deep into the soil to avoid dead angles. The resource and labor costs are too high, and it is difficult for growers to accept.

[0025] In a second aspect, the present application provides a method for synergistically improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules and probiotics, and adopts the following technical solutions.

[0026] Level the soil suffering from continuous cropping obstacle diseases in the previous year, clean up weeds, and create conditions for drone spreading; appropriately supplement water before applying chlorine dioxide sustained-release granules to make the soil moisture content 30-50%; for the soil with less serious continuous cropping obstacle in the previous year; the dosage per mu is 4-6 kg of chlorine dioxide sustained-release granules, and for the soil with more serious continuous cropping obstacle in the previous year, the dosage per mu is 6-8 kg of chlorine dioxide sustained-release granules; plow the continuous cropping obstacle soil within one hour after applying the medicine to make the sustained-release granules fully contact with the soil;

[0027] Probiotics should be timely supplemented within five days after the application of chlorine dioxide sustained-release granules, and 1950 g - 4100 g is used per mu.

[0028] The method of the present application has a faster, more efficient and more environmentally friendly effect than the commonly used pesticide fungicides, and at the same time provides measures to restore the healthy microbial environment of the soil. The provided chlorine dioxide dosage form is a sustained-release granule, which can be directly applied by artificial or drone spreading operation, is more convenient to use than the traditional dosage form, is conducive to the implementation of large-area operations, and chlorine dioxide decomposes into chloride ions and oxygen in the environment, does not damage the environment and will not remain in the soil and crops. The continuous cropping obstacle soil improved by this method can be continuously cropped for 2-3 years.

[0029] While chlorine dioxide inactivates the pathogenic bacteria in the soil, the probiotics will also be inactivated, so microbial pesticides should be timely supplemented within five days after spreading chlorine dioxide sustained-release granules. For example, Bacillus, Trichoderma, Purpureocillium lilacinum, etc., are used to improve and restore the healthy microbial environment in the soil. Timely topdress organic fertilizers to make up for part of the fertilizer source loss in the process of improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules.

[0030] To sum up, the present application has the following beneficial effects:

[0031] 1. Chlorine dioxide can improve soil structure. It can oxidize organic substances in the soil, promote the formation of soil aggregate structure, thereby enhancing the air permeability and water retention capacity of the soil. In addition, chlorine dioxide can also reduce the heavy metal content in the soil, alleviate soil pollution, and is conducive to the restoration and stability of the soil ecosystem. An appropriate amount of chlorine dioxide can stimulate the microbial activities in the soil, improve soil bioactivation. The activities of microorganisms in the soil help decompose organic matter, release nutrients, and promote plant absorption. At the same time, microorganisms can also synthesize some hormone and enzyme substances beneficial to plant growth, enhancing the stress resistance and yield of crops.

[0032] 2. The method of this application has a faster, more efficient, and more environmentally friendly effect than commonly used pesticide fungicides, and at the same time provides measures to restore the healthy microbial environment of the soil. The chlorine dioxide dosage form provided is a slow-release granule, which can be directly spread by artificial or drone operation. It is more convenient to use than traditional dosage forms, facilitating large-area operations. Moreover, chlorine dioxide decomposes into chloride ions and oxygen in the environment, without damaging the environment and without remaining in the soil and crops. The continuous cropping obstacle soil improved by this method can be continuously cropped for 2 - 3 years.

[0033] 3. The present invention ingeniously utilizes the physical characteristics of chlorine dioxide being gaseous at room temperature and having a specific gravity greater than air. Through scientific formulation, it is made into a water-absorbing reaction-type one-pack slow-release agent, and prepared into a granule dosage form by high-efficiency scientific granulation technology, making its spreading operation have a more uniform soil coverage range. It successfully combines the physical and chemical properties of chlorine dioxide, the reaction preparation principle of chlorine dioxide, formulation granulation technology with agricultural production operations. It is convenient to operate, disinfects quickly and efficiently without residue. While using traditional two-pack chlorine dioxide aqueous solutions, tablets, powders and other conventional dosage forms require the use method of first activating them into aqueous solutions and then spraying or irrigating. Their operation workload is too cumbersome, and a large amount of water is needed to ensure that the solution penetrates deep into the soil to avoid dead corners, resulting in too high resource and labor costs, which are difficult for growers to accept. The chlorine dioxide slow-release granules can effectively kill pathogenic microorganisms in the soil and decompose organic pesticide residues in the soil before planting, eliminating pathogenic microorganisms and toxins. The use of probiotics can quickly restore the soil microbial environment. Description of the Drawings

[0034] Figure 1 It is the variation rule of the chlorine dioxide concentration of the chlorine dioxide slow-release granules prepared in Example 1 with the slow-release duration. Detailed Embodiments

[0035] The raw materials of the examples and comparative examples of this application are all commercially available. Among them, the acrylic copolymer resin is purchased from ChemicalBook, and its molecular weight is 5000 - 8000. The test method for the water absorption ratio of the acrylic copolymer resin is to accurately weigh a certain amount of dry acrylic copolymer resin sample, denoted as m0. After immersing the sample completely in water for 1 minute, take it out, remove the excess water on the surface, and weigh it again, denoted as m1. (m1 - m0) / m0 is the water absorption ratio, which indicates how many times the resin can absorb its own weight.

[0036] The following further elaborates on this application in combination with examples and comparative examples.

[0037] Preparation Example 1

[0038] Preparation of chlorine dioxide sustained-release granules: At room temperature, add 40 kg of sodium chlorite and 8 kg of stabilizer into a stirrer, and mix and stir at 300 r / min for 10 minutes. The stabilizer is obtained by mixing 20 - 30 nm CaCO3 and 40 - 50 nm Al2O3 with a mass ratio of 1:2.5 for 5 minutes. Then add 10 kg of anhydrous sodium sulfate and continue to mix and stir at 300 r / min for 10 minutes. Finally, add 30 kg of acidifying agent, 10 kg of sustained-release agent acrylic copolymer resin, and 4 kg of binder magnesium stearate, and mix and stir at 300 r / min for 10 minutes to obtain a mixed material. The acidifying agent is obtained by mixing sodium bisulfate and potassium dihydrogen phosphate with a mass ratio of 1:1.5 for 5 minutes. The particle size of the acrylic copolymer resin is 30 - 100 mesh, and the water absorption ratio is ≥60 times. Place the mixed material in a dry granulator for granulation. In the steps of dry granulation: the roller pressure is 45 - 75 bar, the feeding speed is 30 - 50 r / min, the roller gap is 1.0 - 3.0 mm, and the roller speed is 3.0 - 5.0 r / min. The obtained sustained-release chlorine dioxide soil disinfection granules are sieved through a 60 - 100 mesh sieve, sealed and packaged with an aluminum-plastic film, and stored away from light.

[0039] Preparation Example 2

[0040] Preparation of chlorine dioxide sustained-release granules: At room temperature, 20 kg of potassium chlorite and 1 kg of stabilizer were added to a stirrer and mixed and stirred at 300 r / min for 10 min; the stabilizer was obtained by mixing 20-30 nm CaCO3 and 40-50 nm Al2O3 with a mass ratio of 1:2.5 and stirring for 5 min. Then 2 kg of anhydrous sodium sulfate was added and the mixture was continuously mixed and stirred at 300 r / min for 10 min; finally, 10 kg of acidifying agent, 5 kg of sustained-release agent acrylic copolymer resin and 1 kg of binder magnesium stearate were added and mixed and stirred at 300 r / min for 10 min to obtain a mixed material. The acidifying agent was obtained by mixing sodium bisulfate and potassium dihydrogen phosphate with a mass ratio of 1:1.5 and stirring for 5 min. The particle size of the acrylic copolymer resin was 30-100 mesh, and the water absorption ratio was ≥60 times. The mixed material was placed in a dry granulator for granulation. In the steps of dry granulation: the roller pressure was 45-75 bar, the feeding speed was 30-50 r / min, the roller gap was 1.0-3.0 mm, and the roller speed was 3.0-5.0 r / min. The obtained chlorine dioxide soil disinfection sustained-release granules were sieved through a 60-100 mesh sieve, sealed and packaged with an aluminum-plastic film, and placed in the dark.

[0041] Preparation Example 3

[0042] Preparation of chlorine dioxide sustained-release granules: At room temperature, 50 kg of sodium chlorite and 10 kg of stabilizer were added to a stirrer and mixed and stirred at 300 r / min for 10 min; the stabilizer was obtained by mixing 20-30 nm CaCO3 and 40-50 nm Al2O3 with a mass ratio of 1:2.5 and stirring for 5 min. Then 20 kg of anhydrous sodium sulfate was added and the mixture was continuously mixed and stirred at 300 r / min for 10 min; finally, 50 kg of acidifying agent, 20 kg of sustained-release agent acrylic copolymer resin and 5 kg of binder magnesium stearate were added and mixed and stirred at 300 r / min for 10 min to obtain a mixed material. The acidifying agent was obtained by mixing sodium bisulfate and potassium dihydrogen phosphate with a mass ratio of 1:1.5 and stirring for 5 min. The particle size of the acrylic copolymer resin was 30-100 mesh, and the water absorption ratio was ≥60 times. The mixed material was placed in a dry granulator for granulation. In the steps of dry granulation: the roller pressure was 45-75 bar, the feeding speed was 30-50 r / min, the roller gap was 1.0-3.0 mm, and the roller speed was 3.0-5.0 r / min. The obtained chlorine dioxide soil disinfection sustained-release granules were sieved through a 60-100 mesh sieve, sealed and packaged with an aluminum-plastic film, and placed in the dark.

[0043] Comparative Preparation Example 1

[0044] The difference from Preparation Example 1 was that the stabilizer was obtained by mixing 20-30 nm CaCO3 and 40-50 nm Al2O3 with a mass ratio of 1:2 and stirring for 5 min.

[0045] Comparative Preparation Example 2

[0046] The difference from Preparation Example 1 is that the stabilizer is obtained by stirring and mixing 20-30 nm CaCO3 and 40-50 nm Al2O3 in a mass ratio of 1:3 for 5 minutes.

[0047] Comparative Preparation Example 3

[0048] The difference from Preparation Example 1 is that the acidulant is obtained by stirring and mixing sodium bisulfate and potassium dihydrogen phosphate in a mass ratio of 1:1.3 for 5 minutes.

[0049] Comparative Preparation Example 4

[0050] The difference from Preparation Example 1 is that the acidulant is obtained by stirring and mixing sodium bisulfate and potassium dihydrogen phosphate in a mass ratio of 1:1.8 for 5 minutes.

[0051] Example 1

[0052] This embodiment provides a method for improving soil with continuous cropping problems by synergistically using chlorine dioxide slow-release particles and probiotics.

[0053] The steps include:

[0054] a. Uproot and remove the remaining parts of the crops that were damaged by continuous cropping diseases last year, collect them in clean plastic bags, and take them away from the site for pollution-free disposal.

[0055] Residues of crops affected by continuous cropping diseases from the previous year refer to the residual roots, branches, and leaves left in the soil after crops were infected by soil-borne diseases during previous planting periods. Non-hazardous disposal methods include landfilling, incineration, disinfection, and other methods that kill pathogens or prevent their transfer.

[0056] b. For the soil improvement areas with continuous cropping barriers, ridges should be set up to isolate them from the non-improved areas to prevent soil-borne pathogens in the non-improved areas from infecting the improved soil.

[0057] Isolation ridges can effectively physically isolate unimproved areas, preventing water flowing through unimproved soil blocks from flowing into improved areas.

[0058] c. Level the soil, clear the weeds, and create conditions for drone flying.

[0059] d. Soil moisture content ≤ 50%. Appropriately add water before spreading chlorine dioxide slow-release granules.

[0060] e. For soils with less problems with continuous cropping in the previous year, the dosage is 4 to 6 kilograms of chlorine dioxide slow-release granules per mu. For soils with more serious problems with continuous cropping in the previous year, the dosage is 6 to 8 kilograms of chlorine dioxide slow-release granules per mu.

[0061] Soil with relatively light continuous cropping obstacles refers to the planting land where the number of crops infected by soil-borne disease microorganisms does not exceed 10% of the planting quantity. Soil with relatively severe continuous cropping obstacles is the planting land where the number of crops infected by soil-borne disease microorganisms exceeds 20% of the planting quantity.

[0062] f. Plow the soil with continuous cropping obstacles within one hour after applying the medicine. The depth should not be less than 30 cm and the number of plowing times should not be less than 2 times, so that the slow-release granules can be fully contacted with the soil.

[0063] h. Probiotics should be supplemented in time within five days after applying the chlorine dioxide slow-release granules. The probiotics are obtained by diluting the compound probiotic dry powder with water. The compound probiotic dry powder includes Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus licheniformis, Bacillus laterosporus, and Trichoderma harzianum. Its usual dosage is 200 - 500 g per mu for Bacillus subtilis (the viable count is 50 billion / g), 50 - 100 g per mu for Bacillus amyloliquefaciens (the viable count is 1 billion / g), 1000 - 2000 g per mu for Bacillus licheniformis (the viable count is 20 billion / g), 500 - 1000 g per mu for Bacillus laterosporus (the viable count is 10 billion / g), and 200 - 500 g per mu for Trichoderma harzianum (the viable count is 2 billion / g).

[0064] i. Organic fertilizer should be added in time after planting the plants. Organic fertilizer refers to fertilizers rich in organic matter components such as various fermented animal manures and plant humus.

[0065] Some plants are very sensitive to chloride ions. When the absorption amount reaches a certain level, it will significantly affect the yield and quality. Such crops are called chloride-sensitive crops, such as peach trees, grapes, potatoes, sweet potatoes, beets, citrus, sugarcane, watermelons, etc. The chloride tolerance critical value of common chloride-sensitive crops is 150 - 300 mg / kg. Chlorine dioxide is used for improving the soil with continuous cropping obstacles, about 4 - 6 kg per mu. The proportion of chloride ions introduced into the soil is 0.2 mg / kg, so it will not affect the chloride-sensitive crops.

[0066] Using chlorine dioxide with a concentration of 150 - 200 ppm for seed soaking requires caution, as high-concentration chlorine dioxide will inhibit the germination and growth of seeds.

[0067] After improving the soil with continuous cropping obstacles, diseases caused by soil-borne pathogens infecting plants can be basically eliminated within several years. The product appearance is better, and the yield can be increased by more than 30%.

[0068] Example 2

[0069] This example provides a method for synergistically improving the soil with continuous cropping obstacles by chlorine dioxide slow-release granules and probiotics.

[0070] The difference from Example 1 is that a chlorine dioxide sustained-release granule is prepared by Preparation Example 2.

[0071] Example 3

[0072] This example provides a method for synergistically improving continuous cropping obstacle soil by chlorine dioxide sustained-release granules and probiotics.

[0073] The difference from Example 1 is that a chlorine dioxide sustained-release granule is prepared by Preparation Example 3.

[0074] Comparative Example 1

[0075] This example provides a method for synergistically improving continuous cropping obstacle soil by chlorine dioxide sustained-release granules and probiotics.

[0076] The difference from Example 1 is that a chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 1.

[0077] Comparative Example 2

[0078] This example provides a method for synergistically improving continuous cropping obstacle soil by chlorine dioxide sustained-release granules and probiotics.

[0079] The difference from Example 1 is that a chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 2.

[0080] Comparative Example 3

[0081] This example provides a method for synergistically improving continuous cropping obstacle soil by chlorine dioxide sustained-release granules and probiotics.

[0082] The difference from Example 1 is that a chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 3.

[0083] Comparative Example 4

[0084] This example provides a method for synergistically improving continuous cropping obstacle soil by chlorine dioxide sustained-release granules and probiotics.

[0085] The difference from Example 1 is that a chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 4.

[0086] Performance detection test

[0087] Detection method

[0088] Label 8 improved fields with the chlorine dioxide sustained-release granules prepared in the above examples and comparative examples, namely 1, 2, 3, 4, 5, 6, 7, 8, corresponding to Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4. The area of each improved field is 30m 2, 8 improved fields first leveled the ground. 0.4 kg of chlorine dioxide sustained-release granules were applied to each improved field. After the application of the medicine, plowing was carried out once within 30 minutes and three times in total. The medicine was mixed with the soil. A chlorine dioxide detector was placed in the test field. The sustained-release concentration of chlorine dioxide was further measured.

[0089] Table 1 Chlorine dioxide concentration (mg / m 3 ) of chlorine dioxide soil disinfection granules prepared in the examples and comparative examples varying with the sustained-release duration (min)

[0090]

[0091] As can be seen from Table 1, in terms of both the sustained-release duration and the sustained-release concentration, Examples 1-3 are better than Comparative Examples 1-4. The sustained-release duration of Comparative Examples 1-4 is short and the sustained-release concentration is low, which is not conducive to soil improvement. Among them, the chlorine dioxide sustained-release rate of Example 1 is the slowest, and the sustained-release concentration is the best. Further combined with the field experiment, it is obtained that the chlorine dioxide sustained-release disinfection granules prepared in Example 1 can effectively kill the pathogenic microorganisms in the soil and decompose the organic pesticide residues in the soil, eliminating the pathogenic microorganisms and toxins. Figure 1 It is the variation rule of the chlorine dioxide concentration of the chlorine dioxide sustained-release granules prepared in Example 1 with the sustained-release duration. The release rate reaches the highest within 240 min, reaching 7.12 mg / m 3 . After 480 min, the release rate tends to be flat and reaches 2.15 mg / m 3 after 13 h. It shows that the sustained-release rate of this chlorine dioxide disinfection granule is slow. The chlorine dioxide release concentration is 0.008 mg / m 3 after 19 h. It can be concluded that the chlorine dioxide sustained-release granule prepared in this application has a long sustained-release duration and a significant bactericidal effect.

[0092] This specific embodiment is only an explanation of the present application and does not limit the present application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A chlorine dioxide slow-release granule, characterized in that: The invention comprises 20 to 50 parts of chlorite; 10 to 50 parts of acidifier; 2 to 20 parts of desiccant; 1 to 10 parts of stabilizer; 5 to 20 parts of sustained-release agent; and 1 to 5 parts of binder. The stabilizer is a mixture of CaCO3 and Al2O3 in a mass ratio of 1:2.5, the particle size of the CaCO3 is 20-30 nm, and the particle size of the Al2O3 is 40-50 nm; The acidulant is a mixture of sodium bisulfate and potassium dihydrogen phosphate in a mass ratio of 1:1.

5.

2. A chlorine dioxide slow-release granule according to claim 1, characterized in that: The chlorite is one or both of sodium chlorite and potassium chlorite.

3. The chlorine dioxide slow-release granules according to claim 1, characterized in that: The desiccant is a dehydrated inorganic salt capable of forming a bound water compound.

4. The chlorine dioxide slow-release granules according to claim 1, characterized in that: The sustained-release agent is acrylic acid copolymer resin.

5. The chlorine dioxide slow-release granules according to claim 4, characterized in that: The particle size of the acrylic copolymer resin is 30-100 meshes, and the water absorption ratio is ≥60 times.

6. The chlorine dioxide slow-release granules according to claim 1, characterized in that: The preparation method of the chlorine dioxide slow-release granules comprises the following steps: firstly mixing chlorite and a stabilizer for 10 to 15 minutes; then adding a desiccant and continuing to mix for 10 to 15 minutes; and finally adding an acidifier, a slow-release agent, and a binder and mixing for 10 to 15 minutes to obtain a mixture, and then dry granulating the mixture to obtain the chlorine dioxide slow-release granules.

7. A method for improving soil with continuous cropping obstacles using the chlorine dioxide slow-release granules and probiotics as described in any one of claims 1 to 6, characterized in that: Level the soil affected by continuous cropping problems the previous year and clear weeds to create conditions for drone spraying. Before applying chlorine dioxide slow-release granules, add water appropriately to keep the soil moisture content at 30-50%. For soils with relatively mild continuous cropping problems the previous year, apply 4-6 kg of chlorine dioxide slow-release granules per mu. For soils with more severe continuous cropping problems the previous year, apply 6-8 kg of chlorine dioxide slow-release granules per mu. Till the soil affected by continuous cropping problems within one hour after spraying to ensure full contact between the slow-release granules and the soil. Probiotics should be supplemented in time within five days after the application of chlorine dioxide slow-release granules, using 1950g to 4100g per mu.

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