Chlorine dioxide sustained-release particles and method for synergistically improving continuous cropping obstacle soil by using chlorine dioxide sustained-release particles and probiotics

Abstract

The invention relates to the technical field of agricultural soil remediation, relates to a chlorine dioxide sustained-release particle and a method for synergistically improving continuous cropping obstacle soil through the chlorine dioxide sustained-release particle and probiotics, and particularly discloses the chlorine dioxide sustained-release particle which comprises 20-50 parts of chlorite; 10 to 50 parts of an acidifying agent; 2-20 parts of a drying agent; 1-10 parts of a stabilizer; 5-20 parts of a slow release agent; and 1-5 parts of a binder. Compared with a common pesticide bactericide, the chlorine dioxide sustained-release granule prepared by the invention has the advantages of quicker, more efficient and more environment-friendly effects, and also provides a measure for recovering a healthy microbial environment of soil. The fertilizer can be directly spread manually or by an unmanned aerial vehicle, is more convenient to use than a traditional dosage form, and facilitates implementation of large-area operation. The continuous cropping obstacle soil improved by the method can restore continuous cropping for 2-3 years.

Description

Technical Field

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

[0002] Continuous cropping soils exist in different scales all over the country, especially in the south of my country, where land resources are scarce and the climate is suitable for continuous cropping. Therefore, continuous cropping soils are more widely distributed than in the north.

[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 insect pests, abnormal growth and development, reduced yield and deterioration of product quality.

[0004] Compared with healthy soil, soil with continuous cropping barriers is more prone to soil-borne diseases. Soil-borne diseases refer to pathogens living in the soil. When the temperature and humidity in the soil are suitable, and the crop growth tends to be weak and nutrient-deficient, the pathogens will infect the roots and stem bases of the crops. The infection starts with the capillary roots, and gradually develops to the lateral roots, taproots and vascular bundles over time, destroying the capillary roots, lateral roots, taproots and vascular bundles to absorb water and nutrients in the soil, and eventually causing the crop to die.

[0005] Common diseases caused by continuous cropping disorders, such as root rot, stem base rot, root knot nematode disease, bacterial wilt, damping-off disease, and Verticillium wilt, are caused by pathogens in the soil. Pathogens live in the soil in a latent way. When the temperature is suitable, they infect crops, causing large-scale crop yield reduction and deterioration of crop quality. When the weather turns cold, soil-borne pathogens will be deep in the soil. Soil-borne pathogens can also spread with running water.

[0006] The pathogens of soil-borne diseases can survive and accumulate for a long time, and the causes are complex. Conventional infection, complex infection, latent infection, micro-infection, prevention and control are difficult. At present, there is a shortage of disease-resistant varieties, few available fungicides, and insufficient prevention effects. At present, the prevention and control of soil-borne diseases mainly relies on "fungicide". The fungicides mainly used for soil improvement include thiazothia, avermectin, oxadone, kasugamycin, copper acetate, methamectin, dazomet, chlorobromoisocyanuric acid, etc.

[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] To address the above-mentioned drawbacks 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: 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; and 1 - 5 parts of binder.

[0010] By adopting the above technical solution, the use of chlorine dioxide sustained-release granules is more convenient and precise than traditional chlorine dioxide tablets, powders, and aqueous solutions. For traditional formulations used in 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, single-component powders, two-component powders, and aqueous solutions, chlorine dioxide sustained-release granules have a small particle size, with a diameter of 3 mm per granule 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 release time of chlorine dioxide sustained-release granules is 48 hours long, which can effectively kill pathogenic bacteria deep in the continuous cropping obstacle soil, and very little chloride ion leaks out during the release process.

[0011] 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.

[0012] 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 nano-scale primary particle size of the stabilizer, 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 has found through research that for a mixture of CaCO3 and Al2O3 with a specific particle size, compared with a single nano-particle, the agglomeration between particles is reduced; it is more conducive to coating chlorate.

[0013] Optionally, the chlorite is one or two of sodium chlorite and potassium chlorite.

[0014] By adopting the above technical solution, the chlorite and the solid acid ionize to generate freely mobile chlorite ions and hydrogen ions. 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.

[0015] Optionally, the acidifying agent is a mixture of sodium bisulfate and potassium dihydrogen phosphate with a mass ratio of 1:(1.3 - 1.8).

[0016] By adopting the above technical solution, the solid granule agent is prepared by stabilizing the solid chlorite and the solid acid through an auxiliary material stabilization 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 provided.

[0017] Optionally, the desiccant is a dehydrated inorganic salt capable of forming a water-bound compound.

[0018] 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 release chlorine dioxide gas prematurely.

[0019] 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.

[0020] By adopting the above technical solution, after the acrylic copolymer resin is scattered in the soil, it absorbs moisture in the air, thus providing the reaction conditions and releasing chlorine dioxide gas. Within 30 minutes after the chlorine dioxide gas diffuses in the soil, more than 90% of the disease-causing microorganisms in the soil can be killed. At the same time, the pesticide residues in the soil are oxidized, and the soil health is restored.

[0021] 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 the sustained-release chlorine dioxide soil disinfection granule by dry granulation.

[0022] 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 providing the reaction conditions and releasing chlorine dioxide gas. Within 30 minutes after the chlorine dioxide gas diffuses in the soil, more than 90% of the disease-causing microorganisms in the soil can be killed. At the same time, the pesticide residues in the soil are oxidized, and the soil health is restored. The disinfected chlorine dioxide can be decomposed into chloride ions and oxygen ions within 5 days under natural conditions due to its gaseous property and unstable chemical nature, 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.

[0023] The chlorine dioxide sustained-release granular formulation has the characteristics of small particle size, large number of particles, high active ingredient content and slow release over a long time. For the one-component powder application, since it is too dispersed, for a reactive agent like chlorine dioxide, it is impossible to aggregate the solid acid raw material around the powder raw material, making it difficult to form effective acidic reaction conditions and the chlorine dioxide component cannot be fully released. For the conventional formulations such as the traditional two-component packaged chlorine dioxide aqueous solution, tablets, and powders, the usage method requires activation into an aqueous solution first and then spraying or irrigation. Its 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.

[0024] Secondly, the present application provides a method for synergistically improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules, adopting the following technical solutions.

[0025] Level the soil suffering from continuous cropping obstacle diseases in the previous year, remove weeds, and create conditions for drone spreading; appropriately supplement water before applying the chlorine dioxide sustained-release granules to make the soil moisture content 30 - 50%; for the soil with relatively 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 relatively 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; Probiotics should be promptly supplemented within five days after the application of chlorine dioxide sustained-release granules, with 1950g - 4100g used per mu.

[0026] The method of the present application has a faster, more efficient and more environmentally friendly effect than common pesticide fungicides, and at the same time provides measures to restore the healthy microbial environment of the soil. The provided chlorine dioxide formulation is a sustained-release granule, which can be directly applied by artificial or drone, is more convenient to use than traditional formulations, is conducive to large-area operation, 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 resume continuous cropping for 2 - 3 years.

[0027] While chlorine dioxide inactivates the pathogenic bacteria in the soil, the probiotics will also be inactivated. Therefore, microbial pesticides such as Bacillus, Trichoderma, and Purpureocillium lilacinum should be promptly supplemented within five days after spreading the chlorine dioxide sustained-release granules 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 during the process of improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules.

[0028] In summary, the present application has the following beneficial effects: 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 hormones and enzyme substances beneficial to plant growth, improving the stress resistance and yield of crops.

[0029] 2. The method of this application has faster, more efficient, and more environmentally friendly effects than common 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 operation. 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.

[0030] 3. The present invention ingeniously utilizes the physical characteristics that chlorine dioxide is in a gaseous state at room temperature and has a specific gravity greater than that of air. Through a scientific formula, it is made into a water-absorbing reaction-type one-component packaging slow-release agent, and is prepared into a granule dosage form by a 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, formula granulation technology with agricultural production operations. It is convenient to operate, disinfects quickly and efficiently without residue. While using traditional two-component packaging chlorine dioxide aqueous solutions, tablets, powders and other conventional dosage forms require a usage method of first activating them into an aqueous solution and then spraying or irrigating. Their 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 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is the change rule of the chlorine dioxide concentration of the chlorine dioxide slow-release granules prepared in Example 1 with the slow-release duration. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The raw materials of the embodiments and comparative examples of the present 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 completely immersing the sample 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, indicating how many times its own weight it can absorb.

[0033] The present application will be further described in detail below in combination with examples and comparative examples.

[0034] Preparation Example 1 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; among them, 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. Among them, 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.

[0035] Preparation Example 2 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 stirring and mixing 20-30 nm CaCO3 and 40-50 nm Al2O3 with a mass ratio of 1:2.5 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 stirring and mixing sodium bisulfate and potassium dihydrogen phosphate with a mass ratio of 1:1.5 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 sustained-release chlorine dioxide soil disinfection granules were sieved through a 60-100 mesh sieve, sealed and packaged with an aluminum-plastic film, and stored away from light.

[0036] Preparation Example 3 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 stirring and mixing 20-30 nm CaCO3 and 40-50 nm Al2O3 with a mass ratio of 1:2.5 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 stirring and mixing sodium bisulfate and potassium dihydrogen phosphate with a mass ratio of 1:1.5 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 sustained-release chlorine dioxide soil disinfection granules were sieved through a 60-100 mesh sieve, sealed and packaged with an aluminum-plastic film, and stored away from light.

[0037] Comparative Preparation Example 1 The difference from Preparation Example 1 was that the stabilizer was obtained by stirring and mixing 20-30 nm CaCO3 and 40-50 nm Al2O3 with a mass ratio of 1:2 for 5 min.

[0038] Comparative Preparation Example 2 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.

[0039] Comparative Preparation Example 3 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.

[0040] Comparative Preparation Example 4 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.

[0041] Example 1 This embodiment provides a method for improving soil with continuous cropping obstacles by synergistically using chlorine dioxide slow-release particles and probiotics.

[0042] The steps include: a. Uproot and remove the remaining parts 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.

[0043] The remaining part of the soil that was affected by continuous cropping diseases in the previous year refers to the residual roots, branches, leaves, etc. that remain in the soil after the crops were infected by soil-borne diseases during the previous planting process. Pollution-free treatment includes the use of landfill, incineration, disinfection and other methods to kill pathogenic microorganisms or avoid the transfer of pathogenic microorganisms.

[0044] b. For the soil improvement areas with continuous cropping obstacles, isolation ridges should be set up between them and the non-improved areas to prevent soil-borne pathogens in the non-improved areas from infecting the improved soil.

[0045] Isolation ridges can effectively physically isolate unimproved areas and prevent water flowing through unimproved soil blocks from flowing into improved blocks.

[0046] c. Level the soil, clear the weeds, and create conditions for drone flight.

[0047] d. The soil moisture content is ≤50%. Add water appropriately before spreading chlorine dioxide slow-release granules.

[0048] e. For soils with less continuous cropping problems in the previous year, the dosage is 4 to 6 kg of chlorine dioxide slow-release granules per mu. For soils with more serious continuous cropping problems in the previous year, the dosage is 6 to 8 kg of chlorine dioxide slow-release granules per mu.

[0049] Soil with relatively minor continuous cropping obstacles refers to the planting area 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 refers to the planting area where the number of crops infected by soil-borne disease microorganisms exceeds 20% of the planting quantity.

[0050] f. Plow the soil with continuous cropping obstacles within one hour after applying the medicine. The plowing depth should be no less than 30 cm and the number of plowing times should be no less than 2 times to ensure sufficient contact between the slow-release granules and the soil.

[0051] h. Probiotics should be supplemented in a timely manner within five days after applying the chlorine dioxide slow-release granules. The probiotics are obtained by diluting compound probiotic dry powder with water. The compound probiotic dry powder includes Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus licheniformis, Bacillus laterosporus, and Trichoderma harzianum. The usual dosage is as follows: Bacillus subtilis (with viable count of 50 billion / g) 200 - 500 g per mu, Bacillus amyloliquefaciens (with viable count of 1 billion / g) 50 - 100 g per mu, Bacillus licheniformis (with viable count of 20 billion / g) 1000 - 2000 g per mu, Bacillus laterosporus (with viable count of 10 billion / g) 500 - 1000 g per mu, and Trichoderma harzianum (with viable count of 2 billion / g) 200 - 500 g per mu.

[0052] i. Organic fertilizer should be added in a timely manner after planting the plants. Organic fertilizer refers to fertilizers rich in organic components such as various fermented animal manures and plant humus.

[0053] 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 fruits, sugarcane, watermelons, etc. The chloride tolerance critical value of common chloride-sensitive crops is 150 - 300 mg / kg. When chlorine dioxide is used for improving soil with continuous cropping obstacles, about 4 - 6 kg per mu is used, and the proportion of chloride ions introduced into the soil is 0.2 mg / kg. Therefore, it will not affect chloride-sensitive crops.

[0054] When using chlorine dioxide with a concentration of 150 - 200 ppm for seed soaking, it should be used with caution because high-concentration chlorine dioxide will inhibit the germination and growth of seeds.

[0055] 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%.

[0056] Example 2 This example provides a method for synergistically improving soil with continuous cropping obstacles using chlorine dioxide slow-release granules and probiotics.

[0057] The difference from Example 1 is that a kind of chlorine dioxide slow-release granules is prepared by Preparation Example 2.

[0058] Example 3 This example provides a method for synergistically improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules and probiotics.

[0059] The difference from Example 1 is that a kind of chlorine dioxide sustained-release granule is prepared by Preparation Example 3.

[0060] Comparative Example 1 This example provides a method for synergistically improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules and probiotics.

[0061] The difference from Example 1 is that a kind of chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 1.

[0062] Comparative Example 2 This example provides a method for synergistically improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules and probiotics.

[0063] The difference from Example 1 is that a kind of chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 2.

[0064] Comparative Example 3 This example provides a method for synergistically improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules and probiotics.

[0065] The difference from Example 1 is that a kind of chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 3.

[0066] Comparative Example 4 This example provides a method for synergistically improving continuous cropping obstacle soil with chlorine dioxide sustained-release granules and probiotics.

[0067] The difference from Example 1 is that a kind of chlorine dioxide sustained-release granule is prepared by Comparative Preparation Example 4.

[0068] Performance detection test Detection method Mark 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 , First, level the ground of the 8 improved fields. Apply 0.4 kg of chlorine dioxide sustained-release granules to each improved field. After the application of the medicine, plow the field once within 30 minutes and plow three times. Mix the medicine with the soil. Place a chlorine dioxide detector in the test field. Further measure the slow-release concentration of chlorine dioxide, Table 1 Chlorine dioxide concentration (mg / m of the chlorine dioxide soil disinfection granules prepared in the examples and comparative examples3 With the change of the sustained-release duration (min) As can be seen from Table 1, Examples 1-3 are superior to Comparative Examples 1-4 in terms of both the sustained-release duration and the sustained-release concentration. 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 field experiments, it is obtained that the chlorine dioxide sustained-release disinfection granules prepared in Example 1 can effectively kill pathogenic microorganisms in the soil and decompose the organic pesticide residues in the soil, eliminating pathogenic microorganisms and toxins. Figure 1 It is the change 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 after 13 h 3 . 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 after 19 h 3 . It can be concluded that the sustained-release duration of the chlorine dioxide sustained-release granules prepared in this application is long, and the bactericidal effect is remarkable.

[0069] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present application, they are 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 acidulant; 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:(2-3), 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:(1.3-1.8).

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. A chlorine dioxide slow-release granule 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. A chlorine dioxide slow-release granule 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; finally adding an acidulant, a slow-release agent and a binder and mixing for 10 to 15 minutes to obtain a mixture, and the mixture is dry granulated to obtain the chlorine dioxide slow-release granules.

7. A method for improving soil with continuous cropping obstacles by using chlorine dioxide slow-release particles and probiotics as described in any one of claims 1 to 6, characterized in that: Level the soil that was affected by cropping disorder last year, clear the weeds, and create conditions for drone spraying; before spreading chlorine dioxide slow-release granules, add water appropriately to make the soil moisture content 30-50%; for soils with less cropping disorder last year, the dosage is 4-6 kg of chlorine dioxide slow-release granules per mu, and for soils with more severe cropping disorder last year, the dosage is 6-8 kg of chlorine dioxide slow-release granules per mu; the soil with cropping disorder should be plowed within one hour after spraying to ensure that the slow-release granules are in full contact with the soil; Probiotics should be supplemented in time within five days after the application of chlorine dioxide slow-release granules, using 1950g~4100g per mu.

Images