Agricultural composition containing sulfur and mineral oil and application thereof

Abstract

The invention discloses an agricultural composition containing sulfur and mineral oil and application of the agricultural composition, and belongs to the technical field of pesticides. The effective components of the agricultural composition are composed of sulfur and mineral oil, sulfur is loaded on biochar, sulfur with a slow release effect is obtained, and phytotoxicity caused by direct large-scale contact of mineral oil and sulfur is prevented. The mass ratio of the mineral oil to the sulfur-loaded biochar in the agricultural composition is (35-60): (5-18), and under the matching condition, the agricultural composition has a better control effect on rust mites and citrus red mites and also has a synergistic interaction effect. The invention provides a medicament which is good in prevention and treatment effect, quick in effect taking and long in lasting period for prevention and treatment of rust mites and citrus red mites.

Description

Technical Field

[0001] The invention belongs to the technical field of pesticides and relates to an agricultural composition containing sulfur and mineral oil and application thereof. Background Art

[0002] Mineral oil is a mixture of refined liquid hydrocarbons obtained from petroleum. It is used as an insecticide by forming an oil film on the surface of leaves, isolating and suffocating pests, blocking their respiratory organs, and eventually suffocating them to death. In addition, mineral oil can interfere with the mating and reproduction of pests, and reduce the pests' ability to cause harm and reproduce by blocking their antennae and young plant tissues. Sulfur has a wide spectrum of fungicides and can kill a variety of pests, including mites, aphids, whiteflies, etc. Its insecticidal principle is to destroy the insect's shell and cell membrane, preventing its respiration and metabolism, thereby causing the insect to die.

[0003] Citrus red spider (Panonychus citri) is also known as citrus panonychus mite and citrus spider mite. It is also known as citrus warty skin red spider due to the obvious warty protrusions on the back of its body. It is an arthropod of the genus Panonychus in the family Tetranychidae. Citrus red spiders like light and tend to be new. They usually occur first or frequently in the middle and upper parts of the outer canopy, sunny slopes of hilly orchards, and places with sufficient light. When the temperature is 12℃, the insect population gradually increases, and it flourishes at 20℃. The temperature of 20-30℃ and the relative humidity of 60-70% are suitable for the development and reproduction of citrus red spiders. They mainly suck the juice of leaves, tender shoots, flower buds and fruits, especially tender leaves. They are more harmful to young trees and seedlings. When the disease is serious, it will cause a large number of fallen leaves and fruits, which will affect the yield.

[0004] Citrus rust mite, also known as orange rust mite and rust spider, belongs to Arachnida, Acarina, and Gall Mites, and is an important pest of citrus. Citrus rust mite can produce multiple generations a year, mainly with adult mites and nymphs sucking juice from the surface of citrus leaves and fruits, causing the back of the leaves and the surface of the fruit to be oxidized by the air and turn into black brown or copper green. After the leaves are damaged, they turn yellow and cannot photosynthesize, causing them to fall; they penetrate into the fruit tissue to suck juice, causing the fruit surface to become rough, lose luster, and gradually turn brown. In severe cases, the entire fruit can fall off.

[0005] At present, the commonly used chemical agents for preventing and controlling citrus red spiders and rust spiders include: etoxazole, spirocyclohexine, avermectin, pyridaben, phosmet, isocarbophos, sulfur suspension, cypermethrin, etc. However, citrus red spiders and rust spiders have strong resistance to pesticides. The long-term application of a single agent can easily lead to resistance in pests. Compounding agents with different mechanisms of action can delay or overcome the development of resistance in pests. There is no relevant record of compounding sulfur and mineral oil to prevent and control rust spiders and citrus red spiders in the existing literature. Therefore, it is of great significance to provide a compound agent that improves the control effect of citrus red spiders and rust spiders by scientifically mixing sulfur and mineral oil. Summary of the invention

[0006] In order to solve the above technical problems, the present invention provides an agricultural composition containing sulfur and mineral oil and its application. The effective ingredients of the agricultural composition are composed of sulfur and mineral oil, wherein the sulfur is loaded on biochar to obtain sulfur with a slow-release effect, thereby preventing the phytotoxicity caused by direct and large-scale contact between the mineral oil and sulfur. The mass ratio of the mineral oil to the biochar loaded with sulfur in the agricultural composition is 35-60:5-18. Under this ratio, the agricultural composition has a better control effect on rust spiders and citrus red spiders, and also has a synergistic effect. The present invention provides a medicament with good control effect, quick effect and long lasting effect for the control of rust spiders and citrus red spiders.

[0007] To achieve the technical purpose of the present invention, on the one hand, the present invention provides an agricultural composition containing sulfur and mineral oil, wherein the effective ingredients of the agricultural composition are composed of sulfur and mineral oil; the sulfur is loaded on biochar, and the biochar is corn straw biochar. The mass ratio of mineral oil to sulfur-loaded biochar in the agricultural composition is 35-60:5-18; preferably, the mass ratio of mineral oil to sulfur-loaded biochar in the agricultural composition is 40-60:5-15; further preferably, the mass ratio of mineral oil to sulfur-loaded biochar in the agricultural composition is 50:10.

[0008] Furthermore, the preparation method of corn straw biochar includes: using field corn straw as raw material, preparing biochar by pyrolysis method, crushing the corn straw and passing it through a 150mm sieve, placing it in a crucible, placing it in a muffle furnace and pyrolyzing it at a heating rate of 10°C / min, heating it to 600°C and maintaining it for 2 hours, taking it out after carbonization, adding it to a 3mol / L sodium hydroxide solution and immersing it for 5 hours, then rinsing it with clean water until the washing liquid is neutral, placing it in a 120°C oven and drying it for 8 hours, grinding the dried solid into powder, passing it through a 150mm sieve, and obtaining corn straw biochar.

[0009] Furthermore, the sulfur loading on biochar includes: preparing a 0.3 g / mL sulfur solution with carbon disulfide, adding corn straw biochar, the mass volume ratio of corn straw biochar to sulfur solution is 1:10, placing it in an air bath constant temperature oscillator, adjusting the speed to 180 r / min, oscillating for 24 hours, and then drying it in a 120° C. oven for 8 hours to remove the solvent and form a stable bond between the sulfur and the biochar to obtain sulfur-loaded biochar.

[0010] Specifically, the present invention found through indoor toxicity tests that the agricultural composition containing sulfur and mineral oil significantly improves the toxicity of citrus red spiders after compounding mineral oil and sulfur-loaded biochar in a mass ratio of 35-60:5-18. Under this ratio, the half-lethal concentration of the agricultural composition to citrus red spiders is 18.11-27.15 mg / L. After compounding mineral oil and sulfur-loaded biochar in a mass ratio of 35-60:5-18, the agricultural composition exhibits a synergistic effect in preventing and controlling citrus red spiders. When the mass ratio of mineral oil and sulfur-loaded biochar is 35-60:5-18, the measured toxicity index of the agricultural composition to citrus red spider mites is higher than the theoretical toxicity index, and the co-toxicity coefficients are all greater than 120, showing a synergistic enhancement effect; when the mass ratio of mineral oil and sulfur-loaded biochar is 40-60:5-15, the measured toxicity index of the agricultural composition to citrus red spider mites is significantly higher than the theoretical toxicity index, and the co-toxicity coefficients are all greater than 130, and the synergistic enhancement effect is better; when the mass ratio of mineral oil and sulfur-loaded biochar is 50:10, the measured toxicity index of the agricultural composition to citrus red spider mites is significantly higher than the theoretical toxicity index, and the co-toxicity coefficient is 155.70, and the synergistic enhancement effect is optimal.

[0011] Furthermore, the present invention claims to protect the use of the above agricultural composition in controlling rust spiders and / or citrus red spiders.

[0012] Specifically, the agricultural composition of the present invention has a better control effect on citrus red spiders, has the characteristics of quick effect, and has a long lasting effect. Through field tests, it is known that after the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the control effect of the agricultural composition on citrus red spiders 1d after the drug is 67.53-78.75%; the control effect of the agricultural composition on citrus red spiders 7d after the drug is more than 80%, which is 80.54-86.67%; the control effect of the agricultural composition on citrus red spiders 50d after the drug is still maintained at more than 85%, with a long lasting effect. After the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 50:10, the control effect of the agricultural composition on citrus red spiders is the best. Under this ratio, the control effect is more than 90% from 15d to 50d after the drug.

[0013] Specifically, the agricultural composition of the present invention has a better control effect on rust spiders and also has a longer lasting effect. The present invention learned through field tests that after the mineral oil and the sulfur-loaded biochar were compounded in a mass ratio of 35-60:5-18, the control effect of the agricultural composition on rust spiders 1d after the drug was 63.86-72.97%; the control effect of the agricultural composition on rust spiders 7d after the drug reached more than 80%, which was 78.18-83.71%; the control effect of the agricultural composition on rust spiders 50d after the drug was still maintained at more than 84%, with a longer lasting effect. After the mineral oil and the sulfur-loaded biochar were compounded in a mass ratio of 50:10, the agricultural composition had the best control effect on rust spiders. Under this ratio, the control effect was more than 90% from 15d to 50d after the drug.

[0014] According to the actual application needs, the agricultural composition of the present invention can be prepared into one of the dosage forms such as water emulsion, suspension, wettable powder, water dispersible granule, dispersible oil suspension according to the method known to those skilled in the art. The agricultural composition also contains the auxiliary agent required for preparing the pesticide preparation, and the auxiliary agent can be one or a mixture of solvents, emulsifiers, wetting agents, stabilizers, dispersants, thickeners, pH regulators, defoamers, antifreeze agents, fillers, etc. The auxiliary agents of the present invention can all be known substances, such as various auxiliary agents commonly used in pesticide preparations, which can be changed according to different situations and are not particularly limited.

[0015] Compared with the prior art, the technical solution provided by the present invention has at least the following beneficial effects or advantages:

[0016] The agricultural composition of the present invention uses sulfur and mineral oil as effective ingredients, wherein sulfur is loaded on biochar to obtain sulfur with a slow-release effect, thereby preventing the direct and large-scale contact between mineral oil and sulfur and causing phytotoxicity. Under experimental conditions, the agricultural composition is safe for citrus, and no phytotoxicity is observed after the application of the medicine, and the citrus grows normally. The agricultural composition of the present invention has a relatively good control effect on citrus red spider mites, has the characteristics of rapid effectiveness, and has a long lasting effect. The present invention has learned through field tests that after the mineral oil and the biochar loaded with sulfur are compounded according to a mass ratio of 35 to 60:5 to 18, the control effect of the agricultural composition on citrus red spider mites after 1d of the application is 67.53 to 78.75%; the control effect of the agricultural composition on citrus red spider mites after 7d of the application is more than 80%, which is 80.54 to 86.67%; the control effect of the agricultural composition on citrus red spider mites after 50d of the application is still maintained at more than 85%, and has a long lasting effect. When the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 50:10, the agricultural composition has the best control effect on citrus red spider mites. Under this ratio, the control effect is above 90% from 15 days to 50 days after the application. When the ratio is beyond the range provided by the present invention, that is, the mass ratio of the mineral oil and the sulfur-loaded biochar is 70:1, the control effect of the agricultural composition on citrus red spider mites is poor, and the control effect is maintained at 60.78% to 70.65% from 1 day to 50 days after the application.

[0017] The agricultural composition of the present invention has a better control effect on rust spiders and also has a longer lasting effect. The present invention has learned through field tests that after mineral oil and sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the control effect of the agricultural composition on rust spiders 1d after the application is 63.86-72.97%; the control effect of the agricultural composition on rust spiders 7d after the application is more than 80%, which is 78.18-83.71%; the control effect of the agricultural composition on rust spiders 50d after the application is still maintained at more than 84%, with a longer lasting effect. After mineral oil and sulfur-loaded biochar are compounded in a mass ratio of 50:10, the agricultural composition has the best control effect on rust spiders. Under this ratio condition, the control effect from 15d to 50d after the application is more than 90%. When the ratio is beyond the range provided by the present invention, that is, when the mass ratio of mineral oil to sulfur-loaded biochar is 70:1, the effect of the agricultural composition on controlling rust spiders is poor, and the control effect is maintained at 53.42% to 63.62% from 1 day to 50 days after application.

[0018] The agricultural composition of the present invention has a better control effect on citrus red spider mites and also has a synergistic effect. The present invention has learned through field tests that after the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the agricultural composition exhibits a synergistic effect in controlling citrus red spider mites. When the mass ratio of mineral oil and sulfur-loaded biochar is 35-60:5-18, the measured toxicity index of the agricultural composition to citrus red spider mites is higher than the theoretical toxicity index, and the co-toxicity coefficients are all greater than 120, showing a synergistic enhancement effect; when the mass ratio of mineral oil and sulfur-loaded biochar is 40-60:5-15, the measured toxicity index of the agricultural composition to citrus red spider mites is significantly higher than the theoretical toxicity index, and the co-toxicity coefficients are all greater than 130, and the synergistic enhancement effect is better; when the mass ratio of mineral oil and sulfur-loaded biochar is 50:10, the measured toxicity index of the agricultural composition to citrus red spider mites is significantly higher than the theoretical toxicity index, and the co-toxicity coefficient is 155.70, and the synergistic enhancement effect is optimal. When the ratio exceeds the range provided by the present invention, that is, when the mass ratio of mineral oil to sulfur-loaded biochar is 30:20, 65:3, and 70:1, the co-toxicity coefficient of the agricultural composition to citrus red spider is lower than 120, showing an additive effect. DETAILED DESCRIPTION

[0019] The technical scheme of the present invention is described in conjunction with the embodiments, but the present invention is not limited to the following embodiments. The experimental methods and detection methods described in each embodiment are conventional methods unless otherwise specified; the reagents and materials described are all commercially available unless otherwise specified.

[0020] Sulfur was purchased from the Chinese medicine realgar sulfur mall with a purity of 99%.

[0021] Mineral oil was purchased from Shanghai Yuanye Biotechnology Co., Ltd., also known as white mineral oil, white oil, with a molecular formula of C 25 H 43 NO3, molecular weight is 405.61, purity is CP.

[0022] Example 1

[0023] This example provides an indoor toxicity test of an agricultural composition containing sulfur and mineral oil against citrus spider mites.

[0024] Preparation of sulfur-loaded biochar: Field corn straw was used as raw material, and biochar was prepared by pyrolysis. The corn straw was crushed and passed through a 150 mm sieve, placed in a crucible, and placed in a muffle furnace for pyrolysis at a heating rate of 10°C / min. The temperature was raised to 600°C and maintained for 2 hours. After carbonization, it was taken out and immersed in a 3 mol / L sodium hydroxide solution for 5 hours, then rinsed with clean water until the washing liquid was neutral, placed in a 120°C oven and dried for 8 hours. The dried solid was ground into powder and passed through a 150 mm sieve to obtain corn straw biochar. A 0.3 g / mL sulfur solution was prepared with carbon disulfide, and corn straw biochar was added. The mass volume ratio of corn straw biochar to sulfur solution was 1:10 (g:mL). The solution was placed in an air bath constant temperature oscillator with a speed adjusted to 180 r / min and oscillated for 24 h. The solution was then dried in an oven at 120 °C for 8 h to remove the solvent and form a stable bond between the sulfur and the biochar to obtain sulfur-loaded biochar.

[0025] The adult citrus red spider mites collected in the field were transferred to fresh citrus leaves in clean porcelain plates and placed in a light incubator with a temperature of (25±1)°C, a relative humidity of 70%, and a light / dark period of 14h / 10h for three generations. The adult mites of uniform size, health, and activity were selected for testing.

[0026] After the mineral oil and the sulfur-loaded biochar were diluted 1000 times with water, they were prepared as single-dose mother liquors, and the mixed-dose mother liquors were obtained after compounding according to the mass ratio shown in Table 1. Five volume concentration gradients were set for each single dose and mixed dose according to the equal ratio method, and clean water was used as the control group. Three filter papers were placed in a culture dish (diameter = 11 cm), and clean water was added to wet the filter paper to saturation without dripping. Fresh citrus leaves were soaked in the prepared liquid for 5 seconds and then taken out. The excess liquid on the leaves was dried with absorbent paper and placed in a culture dish, with the back of the leaves facing up, and the petioles were wrapped with wet cotton. The female adult mites were transferred to the leaves with a small brush. 40 female adult mites were placed on each leaf. After stabilization, dead or inactive individuals were removed under a binocular dissecting microscope, so that there were 30 healthy female adult mites on each leaf, and paper towels and dish lids were covered to prevent escape. After the treatment, place the culture dish in a light incubator with a temperature of (25±1)℃, a relative humidity of 70%, and a light / dark period of 14h / 10h. Investigate the results after 48h of incubation, record the total number of mites and the number of dead mites (the brush tip touches the mite body and does not move as death). The mortality rate of the control group is less than 10%, which is an effective test. If the mortality rate of the control group is less than 5%, no correction is required. Repeat each treatment three times. Establish a toxicity regression equation and calculate the LC of each agent. 50 The Sun-Johnson method was used to calculate the co-toxicity coefficient (CTC value) of each compound mixture. Mineral oil was used as the standard agent, and its toxicity index (TI) was 100. The calculation results are shown in Table 1.

[0027] Mortality rate (%) = number of dead eggs × 100 / number of eggs tested;

[0028] Corrected mortality rate (%) = (mortality rate of treatment group - mortality rate of control group) × 100 / (1 - mortality rate of control group);

[0029]

[0030] TTI = TI of agent A × the percentage of agent A in the mixture + TI of agent B × the percentage of agent B in the mixture;

[0031]

[0032] In the formula, TI is the toxicity index of the measured single agent, ATI is the toxicity index of the measured mixture, TTI is the toxicity index of the theoretical mixture, CTC is the co-toxicity coefficient of the compound, A is the standard agent mineral oil, and B is the sulfur-loaded biochar. The synergistic effect of the mixture is judged by the CTC value. CTC values ​​≥ 120 are synergistic, CTC values ​​≤ 80 are antagonistic, and 80 < CTC values ​​< 120 are additive.

[0033] Table 1: Indoor toxicity of agricultural compositions to citrus spider mites

[0034]

[0035]

[0036] As shown in Table 1, the agricultural composition containing sulfur and mineral oil significantly improves the toxicity of citrus red spider after the mineral oil and sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18. Under this ratio, the half lethal concentration of the agricultural composition to citrus red spider is 18.11-27.15 mg / L. After the mineral oil and sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the agricultural composition shows a synergistic effect in preventing and controlling citrus red spider. When the mass ratio of mineral oil and sulfur-loaded biochar is 35-60:5-18, the measured toxicity index of the agricultural composition to citrus red spider mites is higher than the theoretical toxicity index, and the co-toxicity coefficients are all greater than 120, showing a synergistic enhancement effect; when the mass ratio of mineral oil and sulfur-loaded biochar is 40-60:5-15, the measured toxicity index of the agricultural composition to citrus red spider mites is significantly higher than the theoretical toxicity index, and the co-toxicity coefficients are all greater than 130, and the synergistic enhancement effect is better; when the mass ratio of mineral oil and sulfur-loaded biochar is 50:10, the measured toxicity index of the agricultural composition to citrus red spider mites is significantly higher than the theoretical toxicity index, and the co-toxicity coefficient is 155.70, and the synergistic enhancement effect is optimal. When the ratio exceeds the range provided by the present invention, that is, when the mass ratio of mineral oil to sulfur-loaded biochar is 30:20, 65:3, and 70:1, the co-toxicity coefficient of the agricultural composition to citrus red spider is lower than 120, showing an additive effect.

[0037] Example 2

[0038] This example provides a field test of the effect of an agricultural composition containing sulfur and mineral oil on citrus.

[0039] The experiment was conducted in an 8-year-old Chenggu orange orchard in Chenggu County, Hanzhong City, Shaanxi Province. The trees were growing vigorously and the management measures such as soil, fertilizer and water were consistent. The rust spider and citrus red spider in the experimental garden were investigated. The plot test method was adopted. The spacing between citrus plants and rows was 3.5m×2m, and the area of ​​the experimental plot was 35m 2 , randomized block arrangement, three replicates, with protection rows around the cells. After the mineral oil and sulfur-loaded biochar were diluted 1000 times with water, they were compounded and diluted according to the mass ratio shown in Table 2 to obtain a test solution with an active ingredient content of 25 mg / L. The application rate was 60 kg / mu, and all the agents for different treatments were prepared and used immediately. The application began on April 10, and the front and back sides of the citrus leaves were sprayed with a Gongnong-16 backpack manual sprayer, with water spraying as a control. No other acaricides were used during the experiment, and the cultivation and management conditions in the experimental area were uniform and consistent, and in line with local scientific agricultural cultivation measures.

[0040] On the day of spraying, the base number of mites in each treatment was investigated. The investigation was conducted once at 1, 7, 15, 30, and 50 days after spraying. Four trees were investigated in each plot. Five leaves were randomly investigated in the east, south, west, north, and center directions of each tree. 100 leaves were investigated in each plot. The number of live mites on both sides of the leaves was counted, and the control effect of each treatment agent was calculated. The control effect of each treatment agent on citrus red spider is shown in Table 2, and the control effect of each treatment agent on rust spider is shown in Table 3. Under the experimental conditions, the agricultural composition is safe for citrus. No phytotoxicity was observed after the application, and the citrus grew normally.

[0041] Mite population reduction rate (%) = (number of mite population before medication - number of mite population after medication) × 100 / number of mite population before medication;

[0042] Control effect (%) = [1-(number of mites in the blank control area before treatment × number of mites in the treated area after treatment) × 100 / (number of mites in the blank control area after treatment × number of mites in the treated area before treatment).

[0043] Table 2: Control effect of agricultural composition on citrus red spider mite

[0044]

[0045] As shown in Table 2, after the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the agricultural composition has a better control effect on citrus red spider mites, has the characteristics of quick effect, and has a longer lasting effect. At the same time, based on the present invention, sulfur is loaded on biochar to prepare sulfur with a slow release effect. The agricultural composition of the present invention can also prevent the occurrence of pesticide damage after the two are compounded. After the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the control effect of the agricultural composition on citrus red spider mites 1d after the drug is 67.53-78.75%; the control effect of the agricultural composition on citrus red spider mites 7d after the drug is more than 80%, which is 80.54-86.67%; the control effect of the agricultural composition on citrus red spider mites 50d after the drug is still maintained at more than 85%, with a longer lasting effect. When the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 50:10, the agricultural composition has the best control effect on citrus red spider mites. Under this ratio, the control effect is above 90% from 15 days to 50 days after the application. When the ratio is beyond the range provided by the present invention, that is, the mass ratio of the mineral oil and the sulfur-loaded biochar is 70:1, the control effect of the agricultural composition on citrus red spider mites is poor, and the control effect is maintained at 60.78% to 70.65% from 1 day to 50 days after the application.

[0046] Table 3: Control effect of agricultural composition on rust spider

[0047]

[0048] As shown in Table 3, after the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the agricultural composition has a better control effect on rust spiders and a longer lasting effect. At the same time, based on the present invention, sulfur is loaded on biochar to prepare sulfur with a slow release effect. The agricultural composition of the present invention can also prevent the occurrence of pesticide damage after the two are compounded. After the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 35-60:5-18, the control effect of the agricultural composition on rust spiders 1d after the application is 63.86-72.97%; the control effect of the agricultural composition on rust spiders 7d after the application is more than 80%, which is 78.18-83.71%; the control effect of the agricultural composition on rust spiders 50d after the application is still maintained at more than 84%, with a longer lasting effect. When the mineral oil and the sulfur-loaded biochar are compounded in a mass ratio of 50:10, the agricultural composition has the best control effect on rust spiders. Under this ratio, the control effect is above 90% from 15 days to 50 days after the application. When the ratio is beyond the range provided by the present invention, that is, the mass ratio of the mineral oil and the sulfur-loaded biochar is 70:1, the control effect of the agricultural composition on rust spiders is poor, and the control effect is maintained at 53.42-63.62% from 1 day to 50 days after the application.

[0049] The embodiments described above are part of the embodiments of the present invention, but not all of them. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention claimed for protection, but only represents selected embodiments of the present invention. All other embodiments obtained without creative work and related deductions and substitutions made by ordinary technicians in the field under the conditions of the concept of the present invention belong to the scope of protection of the present invention.

Claims

1. An agricultural composition containing sulfur and mineral oil, characterized in that: The active ingredients of the agricultural composition are composed of sulfur and mineral oil; The sulfur is loaded on biochar, and the biochar is corn straw biochar; The mass ratio of mineral oil to sulfur-loaded biochar in the agricultural composition is 35-60:5-18.

2. The agricultural composition according to claim 1, characterized in that The mass ratio of mineral oil to sulfur-loaded biochar in the agricultural composition is 40-60:5-15.

3. The agricultural composition according to claim 1, characterized in that The mass ratio of mineral oil to sulfur-loaded biochar in the agricultural composition is 50:

10.

4. The agricultural composition according to claim 1, characterized in that The method for preparing corn straw biochar comprises: crushing corn straw, carbonizing the corn straw by pyrolysis, adding sodium hydroxide solution for impregnation, washing, drying and then grinding to obtain the corn straw biochar.

5. The agricultural composition according to claim 4, characterized in that The heating rate of the pyrolysis method is 10°C / min, the target temperature of the pyrolysis method is 600°C, and the reaction is carried out at 600°C for 2h.

6. The agricultural composition according to claim 4, characterized in that The concentration of the sodium hydroxide solution is 3 mol / L, and the immersion time is 5 h; The drying temperature is 120° C., and the drying time is 8 hours.

7. The agricultural composition according to claim 1, characterized in that The sulfur loading on biochar comprises: preparing a sulfur solution, adding the corn straw biochar, shaking at 180 r / min for 24 hours, and drying to obtain the sulfur loaded biochar; The mass volume ratio of the corn straw biochar to the sulfur solution is 1:

10.

8. The agricultural composition according to claim 7, characterized in that The concentration of the sulfur solution is 0.3 g / mL; The drying temperature is 120° C., and the drying time is 8 hours.

9. Use of the agricultural composition according to any one of claims 1 to 8 in controlling rust spiders and / or citrus red spiders.

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