A soil disinfectant and soil disinfection method

Abstract

This invention relates to the field of pesticide production technology for disease prevention during crop cultivation, and discloses a soil disinfectant, including agent A and agent B. Agent A includes the following raw materials: chlorine dioxide precursor, peroxide activator, catalyst, and stabilizer; agent B includes the following raw materials: agent A and water-retaining agent. Irregular particles with a longest side less than 0.5 cm are produced through mixing and Fitzpatrick dry pulverization, which can be directly spread into the soil. The small particle shape is more uniform than tablets when spread. The material compression process ensures close contact between the raw materials and guarantees the conversion rate. A catalytic activation system of "peroxide + oxalic acid + cobalt" can rapidly and completely convert chlorite into chlorine dioxide. Sodium malonate adsorbs excess free chlorine generated from peroxide and chloride ions, ensuring product stability. Magnesium chloride not only acts as a desiccant to ensure product stability during storage, but its chloride ions also catalyze the conversion of chlorite.

Description

Technical Field

[0001] The invention relates to the technical field of drug production for preventing diseases in the crop planting process, in particular to a soil disinfectant and a soil disinfection method. Background Art

[0002] Soil-borne diseases and repeated cropping have always been important issues affecting the production and increase of the planting industry. The reason lies in the pathogenic microorganisms in the soil and the organic matter secreted by allelopathic effects. The existing methods such as stuffy greenhouses, high temperatures, and fumigation treatments are not suitable for use during crop planting, affecting the farming season. The only widely used soil disinfectant, chloropicrin, is too toxic and requires special personnel to use. It is highly polluting and costly. Soil disinfection has entered a situation close to "no medicine available". Chlorine dioxide is a green, residue-free disinfectant and oxidant. Studies have confirmed that chlorine dioxide can effectively inactivate pathogenic bacteria and fungi in the soil, and can degrade terpenes and other organic matter that affect crop growth. However, the widely used chlorine dioxide disinfection tablets or disinfection powders are mostly compounded with sodium chlorite and sodium bisulfate or hydrochloric acid, etc. The reaction conversion rate is low, and a large amount of sodium chlorite is wasted, affecting the recovery of the soil microecology and beneficial bacteria populations. A large amount of sulfate ions can also cause soil compaction. Common chlorine dioxide agents are in the form of tablets and powders. The particle size of tablets is generally 0.8-1.2 cm. If they are directly sprinkled into the soil, they cannot be evenly disinfected. If powders are directly sprinkled, the loss is large, and the acid particles and chlorite particles cannot fully contact each other, making it difficult to react and generate sufficient chlorine dioxide.

[0003] Chinese patents disclose some patents for chlorine dioxide soil remediation and treatment (CN111687193.A, CN111922064A, CN114011870.B, CN116355621.A, etc.) using transition metals such as manganese and iron and ultraviolet light in combination with chlorine dioxide catalytic oxidation to treat soil, but this method requires the use of prepared chlorine dioxide, and chlorine dioxide itself is unstable in nature and difficult to stably store and transport, and the storage and transportation costs of this method are extremely high;

[0004] At the same time, the other disclosed series of technologies (CN105766881.A, CN106305771A, CN105875638.A), and the technologies disclosed in CN117337841A, etc., use binary chlorine dioxide releasers, which need to be activated on site before they can be used. The conversion rate is affected by factors such as time, temperature, and light, and it is difficult to ensure a stable effect. In addition, the activation process has a strong smell, which is inconvenient to use.

[0005] Therefore, the present invention provides a soil disinfectant and a soil disinfection method to solve the above-mentioned problems. Summary of the invention

[0006] 1. Technical issues to be solved

[0007] In view of the deficiencies in the prior art, the present invention provides a soil disinfectant and a soil disinfection method, which have the advantages of close contact between the raw materials during the material pressing process and guaranteed conversion rate, and solve the problem that direct sprinkling into the soil cannot disinfect evenly, and direct sprinkling of powder causes great loss, and the acid particles and chlorite particles cannot achieve sufficient contact, making it difficult to react and generate a sufficient amount of chlorine dioxide; avoid the damage to the soil caused by the use of a large amount of acid and sulfate in traditional chlorine dioxide tablets and powder formulas; solve the problems of soil-borne diseases and repeated cropping.

[0008] (II) Technical solution

[0009] To achieve the above object, the present invention provides the following technical solution: a soil disinfectant, comprising agent A and agent B, agent A comprising the following raw materials in the following weight proportions: 10-30 parts of a chlorine dioxide precursor, 25-50 parts of a peroxide activator, 12-25 parts of a catalyst, and 4-15 parts of a stabilizer;

[0010] Agent B comprises the following raw materials in the following weight proportions: 100-200 parts of agent A and 2-20 parts of water retaining agent.

[0011] Preferably, the chlorine dioxide precursor is any one of sodium chlorite or potassium chlorite.

[0012] Preferably, the peroxide activator is any one of ammonium percarbonate, sodium percarbonate and solid hydrogen peroxide in combination with potassium monopersulfate and potassium dihydrogen phosphate.

[0013] Preferably, the catalyst is prepared by mixing cobalt chloride and oxalic acid.

[0014] Preferably, the stabilizer is a mixture of magnesium chloride and sodium malonate.

[0015] Preferably, the water-retaining agent is one of sodium hydroxypropyl methylcellulose, carboxymethyl cellulose and sodium alginate, or a mixture of the three in any proportion.

[0016] Another technical problem to be solved by the present invention is to provide a soil disinfection method using a soil disinfectant, comprising the following steps:

[0017] Step 1: Weigh appropriate amounts of raw materials for Agent A and Agent B;

[0018] Step 2: Mix the raw materials of Agent A and Agent B respectively to obtain powder A and powder B;

[0019] Step 3: Process the mixed powder A and powder B into granules with a diameter of about 0.1-0.3 cm using a Fitzpatrick dry granulator, thereby obtaining two products, namely, agent A and agent B;

[0020] Step 4: Prepare the disinfectant for use: During the crop growth period, dissolve the agent in water and use Agent A; irrigate with water, the chlorine dioxide concentration is 1-100 mg / L;

[0021] Step 5: When using Agent A alone: ​​When transplanting or planting, add water to Agent A to activate it into a solution with a chlorine dioxide concentration of 100-200 mg / L. Water the solution around the seeds or seedlings to wet the soil 20-50 cm laterally and downward;

[0022] Step 6: When using Agent B alone: ​​When transplanting or planting, add 5-20g of Agent B into the hole with the seeds or seedlings, add 2kg of water, water with the seeds or seedlings as the center, and wet the soil 20-30cm horizontally and downward;

[0023] Step 7: When spreading over a large area: Type A or B solid particles can be evenly sprinkled directly on the soil surface, which will slowly react and release chlorine dioxide.

[0024] Preferably, the mixing and feeding sequence in step 2 is: after the chlorine dioxide precursor is mixed with the stabilizer, the catalyst is added and mixed evenly, and finally the peroxide activator is added and mixed.

[0025] (III) Beneficial effects

[0026] Compared with the prior art, the present invention provides a soil disinfectant and a soil disinfection method, which have the following beneficial effects:

[0027] 1. The materials in the soil disinfectant are mixed and Fitzpatrick dry-crushed into irregular particles with the longest side less than 0.5 cm, which can be directly sprinkled into the soil for use. The shape of small particles is more uniform than tablets when scattered. The material pressing process makes the raw materials in close contact and also ensures the conversion rate.

[0028] 2. The soil disinfection method of the soil disinfectant can quickly and completely convert chlorite into chlorine dioxide by adopting the catalytic activation system of "peroxide + oxalic acid + cobalt"; sodium malonate can adsorb excess free chlorine generated by peroxide and chloride ions to ensure the stability of the product; magnesium chloride not only acts as a desiccant to ensure the stability of the product during storage, but the chloride ions therein can also play a catalytic role in the conversion process of chlorite.

[0029] 3. The soil disinfectant releases chlorine dioxide slowly and has a long-lasting effect. The soil pH value can be adjusted by adjusting the amount of added acidic substances, and it is particularly suitable for saline-alkali land. The selected raw materials are beneficial to the soil and replenish the major elements such as N, P, and K in the soil. It can inactivate bacteria and fungi in the soil that are harmful to crops and prevent soil-borne diseases. It can be used directly without activation. It has a high conversion rate and no chlorite residue. It prevents repeated cropping and drives away root-knot nematodes. DETAILED DESCRIPTION

[0030] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Embodiment 1:

[0032] A soil disinfectant comprises an agent A and an agent B, wherein the agent A comprises the following raw materials in the following weight proportions: 10 parts of a chlorine dioxide precursor, 30 parts of a peroxide activator, 20 parts of a catalyst, and 10 parts of a stabilizer;

[0033] The chlorine dioxide precursor is potassium chlorite, the peroxide activator is solid hydrogen peroxide combined with potassium monopersulfate and potassium dihydrogen phosphate, the catalyst is a mixture of cobalt chloride and oxalic acid, and the stabilizer is a mixture of magnesium chloride and sodium malonate.

[0034] Agent B includes the following raw materials in the following weight proportions: 150 parts of Agent A and 10 parts of water retaining agent;

[0035] The water retaining agent is a mixture of carboxymethyl cellulose and sodium alginate in any proportion;

[0036] A soil disinfection method using a soil disinfectant comprises the following steps:

[0037] Step 1: Weigh appropriate amounts of raw materials for Agent A and Agent B;

[0038] Step 2: Mix the raw materials of Agent A and Agent B respectively to obtain powder A and powder B;

[0039] Step 3: Process the mixed powder A and powder B into granules with a diameter of about 0.2 cm using a Fitzpatrick dry granulator, thereby obtaining two products, namely, agent A and agent B;

[0040] Step 4: Prepare the disinfectant for use: During the crop growth period, dissolve the agent in water and use Agent A; irrigate with water, the chlorine dioxide concentration is 50mg / L;

[0041] Step 5: When using Agent A alone: ​​When transplanting or planting, add water to Agent A to activate it into a solution with a chlorine dioxide concentration of 150 mg / L. Water the solution around the seeds or seedlings to wet the soil 20 cm laterally and downward;

[0042] Step 6: When using Agent B alone: ​​When transplanting or planting, add 15g of Agent B into the hole with the seeds or seedlings, add 2kg of water, water with the seeds or seedlings as the center, and wet the soil 25cm horizontally and downward;

[0043] Step 7: When spreading over a large area: Type A or B solid particles can be evenly sprinkled directly on the soil surface, which will slowly react and release chlorine dioxide.

[0044] Embodiment 2:

[0045] A soil disinfectant comprises an agent A and an agent B, wherein the agent A comprises the following raw materials in the following weight proportions: 30 parts of a chlorine dioxide precursor, 50 parts of a peroxide activator, 25 parts of a catalyst, and 15 parts of a stabilizer;

[0046] The chlorine dioxide precursor is potassium chlorite, the peroxide activator is ammonium percarbonate, sodium percarbonate, potassium monopersulfate and potassium dihydrogen phosphate, the catalyst is a mixture of cobalt chloride and oxalic acid, and the stabilizer is a mixture of magnesium chloride and sodium malonate.

[0047] Agent B includes the following raw materials in the following weight proportions: 200 parts of Agent A and 20 parts of water retaining agent;

[0048] The water retaining agent is sodium hydroxypropyl methylcellulose;

[0049] A soil disinfection method using a soil disinfectant comprises the following steps:

[0050] Step 1: Weigh appropriate amounts of raw materials for Agent A and Agent B;

[0051] Step 2: Mix the raw materials of Agent A and Agent B respectively to obtain powder A and powder B;

[0052] Step 3: Process the mixed powder A and powder B into granules with a diameter of about 0.3 cm using a Fitzpatrick dry granulator, thereby obtaining two products, namely, agent A and agent B;

[0053] Step 4: Prepare the disinfectant for use: During the crop growth period, dissolve the agent in water and use Agent A; irrigate with water, the chlorine dioxide concentration is 100 mg / L;

[0054] Step 5: When using Agent A alone: ​​When transplanting or planting, add water to Agent A to activate it into a solution with a chlorine dioxide concentration of 200 mg / L. Water the solution around the seeds or seedlings to wet the soil 50 cm laterally and downward;

[0055] Step 6: When using Agent B alone: ​​When transplanting or planting, add 20g of Agent B into the hole with the seeds or seedlings, add 2kg of water, water with the seeds or seedlings as the center, and wet the soil 30cm laterally and downward;

[0056] Step 7: When spreading over a large area: Type A or B solid particles can be evenly sprinkled directly on the soil surface, which will slowly react and release chlorine dioxide.

[0057] Embodiment three:

[0058] A soil disinfectant comprises an agent A and an agent B, wherein the agent A comprises the following raw materials in the following weight proportions: 10 parts of a chlorine dioxide precursor, 25 parts of a peroxide activator, 12 parts of a catalyst, and 4 parts of a stabilizer;

[0059] The chlorine dioxide precursor is sodium chlorite, the peroxide activator is ammonium percarbonate combined with potassium monopersulfate and potassium dihydrogen phosphate, the catalyst is a mixture of cobalt chloride and oxalic acid, and the stabilizer is a mixture of magnesium chloride and sodium malonate.

[0060] Agent B includes the following raw materials in the following weight proportions: 100 parts of Agent A and 2 parts of water retaining agent;

[0061] The water retaining agent is a mixture of hydroxypropyl methylcellulose sodium, carboxymethyl cellulose and sodium alginate in any proportion;

[0062] A soil disinfection method using a soil disinfectant comprises the following steps:

[0063] Step 1: Weigh appropriate amounts of raw materials for Agent A and Agent B;

[0064] Step 2: Mix the raw materials of Agent A and Agent B respectively to obtain powder A and powder B;

[0065] Step 3: Process the mixed powder A and powder B into granules with a diameter of about 0.1 cm using a Fitzpatrick dry granulator, thereby obtaining two products, namely, agent A and agent B;

[0066] Step 4: Prepare the disinfectant for use: During the crop growth period, dissolve the agent in water and use Agent A; irrigate with water, the chlorine dioxide concentration is 1 mg / L;

[0067] Step 5: When using Agent A alone: ​​When transplanting or planting, add water to Agent A to activate it into a solution with a chlorine dioxide concentration of 100 mg / L. Water the solution around the seeds or seedlings to wet the soil 20 cm laterally and downward;

[0068] Step 6: When using Agent B alone: ​​When transplanting or planting, add 5g of Agent B into the hole with the seeds or seedlings, add 2kg of water, water with the seeds or seedlings as the center, and wet the soil 20cm horizontally and downward;

[0069] Step 7: When spreading over a large area: Type A or B solid particles can be evenly sprinkled directly on the soil surface, which will slowly react and release chlorine dioxide.

[0070] Experimental example:

[0071] 20 parts of sodium chlorite, 15 parts of ammonium percarbonate, 15 parts of potassium monopersulfate, 10 parts of potassium dihydrogen phosphate, 2 parts of cobalt chloride, 10 parts of oxalic acid, 3 parts of magnesium chloride and 5 parts of sodium malonate were mixed in the order of addition and crushed into 0.2 m particles to obtain Agent A.

[0072] Its content is 10% according to the five-step iodine titration method and its stability is 2 years.

[0073] 20 parts of sodium chlorite, 15 parts of ammonium percarbonate, 15 parts of potassium monopersulfate, 10 parts of potassium dihydrogen phosphate, 2 parts of cobalt chloride, 10 parts of oxalic acid, 3 parts of magnesium chloride, 5 parts of sodium malonate, 2 parts of carboxymethyl cellulose, and 0.5 parts of sodium alginate are mixed in the order of addition, pressed into cakes and crushed into 0.2 cm broken particles to obtain Agent B;

[0074] Its content is 8% according to the five-step iodine titration method and its stability is 2 years.

[0075] The experiment used a fixed-point application method to disinfect the greenhouse soil of peppers planted for 6 years. 20g of B agent granules were added to each hole. The pepper seedlings were transplanted 15 days after treatment. The results showed that the incidence of root rot in the experimental group was only 3%, while the incidence of the control group without soil disinfection was more than 80%, and the seedling mortality rate was about 72%.

[0076] Agent A was dissolved in water to prepare a solution, and the roots of grafted cucumbers planted for 7 years were also disinfected by irrigation. The results showed that the incidence of root nematode disease in the experimental group was 12% after one year, and the disease was mild, the nodules were small, and there was almost no effect on the yield. The incidence of root knot nematode disease in the control cucumber group that was not disinfected was 77% after one year, and the yield was reduced by 34.5%.

[0077] The beneficial effects of the present invention are as follows: the materials in the soil disinfectant are mixed and pulverized by the Fitzpatrick dry method to form irregular particles with the longest side less than 0.5 cm, which can be directly sprinkled into the soil for use; the morphology of the small particles is more uniform than that of tablets when scattered; the material pressing process allows the raw materials to be in close contact and also ensures the conversion rate; the soil disinfection method of the soil disinfectant can quickly and completely convert chlorite into chlorine dioxide by adopting a catalytic activation system of "peroxide + oxalic acid + cobalt"; sodium malonate can adsorb excess free chlorine generated by peroxide and chloride ions to ensure the stability of the product Magnesium chloride not only acts as a desiccant to ensure the stability of the product during storage, but the chloride ions therein can also catalyze the conversion of chlorite. The soil disinfectant releases chlorine dioxide slowly and has a long effect. The soil pH value can be adjusted by adjusting the amount of added acidic substances, and it is particularly suitable for saline-alkali land. The selected raw materials are beneficial to the soil and supplement the constant elements such as N, P, and K in the soil. Bacteria and fungi in the soil that are harmful to crops can be inactivated to prevent soil-borne diseases. It can be used directly without activation. It has a high conversion rate and no chlorite residue. It prevents repeated cropping and drives away root-knot nematodes.

[0078] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil disinfectant, characterized in that: The method comprises agent A and agent B, wherein agent A comprises the following raw materials in the following weight proportions: 10-30 parts of chlorine dioxide precursor, 25-50 parts of peroxide activator, 12-25 parts of catalyst, and 4-15 parts of stabilizer; Agent B includes the following raw materials in the following weight proportions: 100-200 parts of agent A and 2-20 parts of water retaining agent; Agent A and Agent B are used alone; The chlorine dioxide precursor is any one of sodium chlorite or potassium chlorite; the peroxide activator is any one of ammonium percarbonate, sodium percarbonate and solid hydrogen peroxide in combination with potassium monopersulfate and potassium dihydrogen phosphate; the catalyst is a mixture of cobalt chloride and oxalic acid; and the stabilizer is a mixture of magnesium chloride and sodium malonate.

2. A soil disinfectant according to claim 1, characterized in that: The water retaining agent is one of hydroxypropyl methylcellulose sodium, carboxymethyl cellulose and sodium alginate or a mixture of the three in any proportion.

3. A soil disinfection method using a soil disinfectant according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: Weigh appropriate amounts of raw materials for Agent A and Agent B; Step 2: Mix the raw materials of Agent A and Agent B respectively to obtain powder A and powder B; Step 3: Process the mixed powder A and powder B into granules with a diameter of 0.1-0.3 cm using a Fitzpatrick dry granulator, thereby obtaining two products, namely, agent A and agent B; Step 4: Prepare the disinfectant for use: During the crop growth period, dissolve the agent in water and use Agent A; irrigate with water, the chlorine dioxide concentration is 1-100 mg / L; Step 5: When using Agent A alone: ​​When transplanting or planting, add water to Agent A to activate it into a solution with a chlorine dioxide concentration of 100-200 mg / L. Water the solution around the seeds or seedlings to wet the soil 20-50 cm laterally and downward; Step 6: When using Agent B alone: ​​When transplanting or planting, add 5-20g of Agent B into the hole with the seeds or seedlings, add 2kg of water, water with the seeds or seedlings as the center, and wet the soil 20-30cm horizontally and downward; Step 7: When spreading over a large area: Type A or B solid particles can be evenly sprinkled directly on the soil surface, which will slowly react and release chlorine dioxide.