A foliar control agent for reducing cadmium content of rice brown rice and a method of use thereof

Abstract

The application discloses a foliar control agent for reducing cadmium content of rice brown rice and a use method thereof, and relates to the technical field of agriculture. The foliar control agent is composed of the following components: hematin chloride with a concentration of 3-10 micromoles per liter; glutathione with a concentration of 0.1-1 millimoles per liter; NaHS with a concentration of 5-10 micromoles per liter; sodium dodecyl sulfate (SDS) with a concentration of 3-5 millimoles per liter; and water. The compound foliar control agent is sprayed on rice at a tilling stage, a heading stage and a filling stage, respectively, and the spraying amount is 20-40 kg per mu each time. The application utilizes the synergistic effect among hematin chloride, glutathione and NaHS, and adopts a surfactant to expand the solubility of hematin chloride, so that the cadmium reduction effect of rice brown rice is greatly improved, and the cadmium reduction efficiency can reach more than 90%. The foliar control agent has simple components, outstanding synergistic effect of components, simple use and practical use value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural technology, in particular to a foliar control agent for reducing cadmium content of brown rice and a use method thereof. BACKGROUND

[0002] Current foliar control agents for rice are mostly single active ingredients, such as silicon preparations, humic acid or plant growth regulators, which can produce control effects on specific heavy metals (such as cadmium and arsenic), but have problems such as single target point and poor environmental adaptability. Experiments show that the control efficiency of single agent in a specific rice field environment decreases by more than 40%, and continuous use can easily induce heavy metal resistance. In addition, single agent is difficult to simultaneously regulate the multiple mechanisms of cadmium reduction in rice, resulting in a fluctuation range of 30%-50% in the accumulation amount of heavy metals in rice grains.

[0003] Existing composite control agents mostly use simple physical mixing, such as silicon-calcium fertilizer + alginic acid, and there is an antagonistic effect between components: inorganic silicon is easily flocculated and precipitated when combined with organic acid, reducing the adhesion rate on the leaf surface; multi-component compounding leads to imbalance of critical micelle concentration, reducing the leaf penetration efficiency by 15%-25%; some formulations contain more than 5 additives, which not only increase the application cost, but also cause leaf fertilizer damage risk. Field data shows that the average inhibition rate of existing composite agents on cadmium content in rice is only 35%-55%, which does not achieve the ideal synergistic effect.

[0004] There is an urgent need to develop a new type of composite foliar control agent for rice, which can achieve stable and far below 0.2mg / kg national standard limit of heavy metal content in rice through simple component compounding and synergistic effect, and the application process does not exceed 3 times / season. SUMMARY

[0005] The present application aims to overcome the shortcomings of the prior art and provides a foliar control agent for reducing cadmium content of brown rice and a use method thereof, relating to the field of agricultural technology; the foliar control agent comprises: hematin chloride at a concentration of 3-10μmol / L; glutathione at a concentration of 0.1-1mmol / L; NaHS at a concentration of 5-10μmol / L; sodium dodecyl sulfate SDS at a concentration of 3-5mmol / L; and the rest is water; the composite foliar control agent is sprayed at each of the tillering stage, heading stage and grain filling stage of rice, and the spraying amount is 20-40kg per mu each time; the present application utilizes the synergistic effect of hematin chloride, glutathione and NaHS, and uses a surfactant to expand the solubility of hematin chloride, thereby greatly improving the cadmium reduction effect of brown rice, and the cadmium reduction efficiency can reach more than 90%; the foliar control agent of the present application has simple components, outstanding synergistic effect of components, and is easy to use, and has practical use value.

[0006] To achieve the above technical effects, the following technical solutions are adopted:

[0007] A foliar control agent for reducing cadmium content of paddy brown rice, the component formula of which is as follows:

[0008] The concentration of hematin chloride is 3-10 μmol / L; the concentration of glutathione is 0.1-1 mmol / L; the concentration of NaHS is 5-10 μmol / L; the concentration of sodium dodecyl sulfate SDS is 3-5 mmol / L; and the rest is water.

[0009] Further, the component formula of the foliar control agent is as follows:

[0010] The concentration of hematin chloride is 5 μmol / L; the concentration of glutathione is 0.5 mmol / L; the concentration of NaHS is 10 μmol / L; the concentration of sodium dodecyl sulfate SDS is 5 mmol / L; and the rest is water.

[0011] Further, the preparation method of the foliar control agent is as follows:

[0012] According to the concentration requirements and preparation amount, hematin chloride, glutathione, NaHS, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water, then hematin chloride is added, and after uniform stirring, the mixture is left to stand for 5-10 minutes, then glutathione is added, and after uniform stirring, NaHS is finally added and stirred to obtain the foliar control agent for reducing cadmium content of paddy brown rice; the foliar control agent is prepared immediately and cannot be stored for more than 3 hours.

[0013] Further, the use method of the foliar control agent for reducing cadmium content of paddy brown rice is as follows:

[0014] The foliar control agent is sprayed at the tillering stage, the heading stage and the filling stage of rice, respectively, and the spraying amount is 20-40 kg per mu each time.

[0015] Further, the spraying site is the leaf surface and the back of the leaf of rice.

[0016] Further, the spraying time of the foliar control agent is before 10 o'clock in the morning or after 4 o'clock in the afternoon on a sunny or cloudy day without wind.

[0017] Further, the suitable temperature range for spraying the foliar control agent is 15-25℃.

[0018] Further, the foliar control agent is applied to reduce cadmium content of paddy brown rice.

[0019] The beneficial effects of the present application are as follows:

[0020] The application discloses a foliar surface control agent for reducing cadmium content of rice brown rice and a use method thereof, and relates to the technical field of agriculture. The foliar surface control agent is composed of the following components: hematin chloride with a concentration of 3-10 mu mol / L; glutathione with a concentration of 0.1-1 mmol / L; NaHS with a concentration of 5-10 mu mol / L; sodium dodecyl sulfate (SDS) with a concentration of 3-5 mmol / L; and water; the compound foliar surface control agent is sprayed at each of a tillering stage, a heading stage and a filling stage of rice, and the spraying amount is 20-40 kg per mu each time; the synergistic effect of hematin chloride, glutathione and NaHS is utilized, and the solubility of hematin chloride is expanded by using a surfactant, so that the cadmium reduction effect of rice brown rice is greatly improved, and the cadmium reduction efficiency can reach more than 90%; the foliar surface control agent has simple components, outstanding synergistic effect of components, simple use and practical use value. DETAILED DESCRIPTION

[0021] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to examples. It should be understood that the specific examples described herein are only used to explain the present application and not intended to limit the present application.

[0022] It should be pointed out that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0023] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of a feature, step, operation and / or combination thereof.

[0024] Example 1

[0025] The concentration of hematin chloride is 3 mu mol / L; the concentration of glutathione is 0.1 mmol / L; the concentration of NaHS is 5 mu mol / L; the concentration of sodium dodecyl sulfate (SDS) is 3 mmol / L; and the rest is water.

[0026] Taking 100 L of the foliar surface control agent as an example, the amount of hematin chloride is 0.196 g; the amount of glutathione is 3.073 g; the amount of NaHS is 0.028 g; the amount of sodium dodecyl sulfate (SDS) is 86.514 g; and the rest is water.

[0027] According to the concentration requirements and preparation amount, hematin chloride, glutathione, NaHS, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water, then hematin chloride is added, stirred uniformly, and then placed for 5-10 minutes, then glutathione is added, stirred uniformly, and finally NaHS is added and stirred to dissolve uniformly to obtain foliar control agent 1 for reducing cadmium content of rough rice; it is used immediately and cannot be stored for more than 3 hours.

[0028] Example 2

[0029] The concentration of hematin chloride is 10 μmol / L; the concentration of glutathione is 1 mmol / L; the concentration of NaHS is 10 μmol / L; the concentration of sodium dodecyl sulfate SDS is 5 mmol / L; and the rest is water.

[0030] Taking 100 L of foliar control agent as an example, hematin chloride: 0.653 g; glutathione: 30.730 g; NaHS: 0.056 g; sodium dodecyl sulfate SDS: 144.190 g; and the rest is water.

[0031] According to the concentration requirements and preparation amount, hematin chloride, glutathione, NaHS, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water, then hematin chloride is added, stirred uniformly, and then placed for 5-10 minutes, then glutathione is added, stirred uniformly, and finally NaHS is added and stirred to dissolve uniformly to obtain foliar control agent 1 for reducing cadmium content of rough rice; it is used immediately and cannot be stored for more than 3 hours.

[0032] Example 3

[0033] The concentration of hematin chloride is 5 μmol / L; the concentration of glutathione is 0.5 mmol / L; the concentration of NaHS is 10 μmol / L; the concentration of sodium dodecyl sulfate SDS is 5 mmol / L; and the rest is water.

[0034] Taking 100 L of foliar control agent as an example, hematin chloride: 0.327 g; glutathione: 15.365 g; NaHS: 0.056 g; sodium dodecyl sulfate SDS: 144.190 g; and the rest is water.

[0035] According to the concentration requirements and preparation amount, hematin chloride, glutathione, NaHS, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water, then hematin chloride is added, stirred uniformly, and then placed for 5-10 minutes, then glutathione is added, stirred uniformly, and finally NaHS is added and stirred to dissolve uniformly to obtain foliar control agent 1 for reducing cadmium content of rough rice; it is used immediately and cannot be stored for more than 3 hours.

[0036] All the comparative examples are based on Example 3.

[0037] Comparative Example 1:

[0038] For example, 100 L of foliar resistance control agent, hematin chloride: 15.748 g; sodium dodecyl sulfate SDS: 144.190 g; the balance is water.

[0039] According to the concentration requirement and the preparation amount, hematin chloride, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water first, then hematin chloride is added, and after stirring evenly, it is left for 5-10 minutes, and then stirred and dissolved to obtain foliar resistance control agent 4; it is used immediately and cannot be stored for more than 3 hours.

[0040] Comparative Example 2:

[0041] For example, 100 L of foliar resistance control agent, glutathione: 15.748 g; sodium dodecyl sulfate SDS: 144.190 g; the balance is water.

[0042] According to the concentration requirement and the preparation amount, glutathione, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water first, then glutathione is added, and after stirring evenly, foliar resistance control agent 5 is obtained; it is used immediately and cannot be stored for more than 3 hours.

[0043] Comparative Example 3:

[0044] For example, 100 L of foliar resistance control agent, NaHS: 15.748 g; sodium dodecyl sulfate SDS: 144.190 g; the balance is water.

[0045] According to the concentration requirement and the preparation amount, NaHS, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water first, then NaHS is added and stirred and dissolved evenly to obtain foliar resistance control agent 6; it is used immediately and cannot be stored for more than 3 hours.

[0046] Comparative Example 4:

[0047] For example, 100 L of foliar resistance control agent, hematin chloride: 0.328 g; glutathione: 15.420 g; sodium dodecyl sulfate SDS: 144.190 g; the balance is water.

[0048] According to the concentration requirement and the preparation amount, hematin chloride, glutathione, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water first, then hematin chloride is added, and after stirring evenly, it is left for 5-10 minutes, and then glutathione is added, and after stirring evenly, foliar resistance control agent 7 is obtained; it is used immediately and cannot be stored for more than 3 hours.

[0049] Comparative Example 5:

[0050] Take 100L foliar resistance control agent as an example, hematin chloride: 13.447g; NaHS: 2.301g; sodium dodecyl sulfate SDS: 144.190g; the rest is water.

[0051] According to the concentration requirements and preparation amount, hematin chloride, NaHS, sodium dodecyl sulfate SDS and water are weighed; first, sodium dodecyl sulfate SDS is dissolved in water, then hematin chloride is added, stirred uniformly, and after standing for 5-10 minutes, NaHS is added and stirred to dissolve uniformly to obtain foliar resistance control agent 8; it is used immediately and cannot be stored for more than 3 hours.

[0052] Comparative Example 6:

[0053] Take 100L foliar resistance control agent as an example, glutathione: 15.691g; NaHS: 0.057g; sodium dodecyl sulfate SDS: 144.190g; the rest is water.

[0054] According to the concentration requirements and preparation amount, glutathione, NaHS, sodium dodecyl sulfate SDS and water are weighed; first, sodium dodecyl sulfate SDS is dissolved in water, then glutathione is added, stirred uniformly, and after standing for 5-10 minutes, NaHS is added and stirred to dissolve uniformly to obtain foliar resistance control agent 9; it is used immediately and cannot be stored for more than 3 hours.

[0055] Comparative Example 7:

[0056] Take 100L foliar resistance control agent as an example, sodium dodecyl sulfate SDS: 144.190g; the rest is water.

[0057] According to the concentration requirements and preparation amount, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water to obtain foliar resistance control agent 10; it is used immediately and cannot be stored for more than 3 hours.

[0058] Comparative Example 8:

[0059] Take 100L foliar resistance control agent as an example, all of which is water. It is recorded as foliar resistance control agent 11.

[0060] The foliar resistance control agents in Examples 1-3 and Comparative Examples 1-8 are evaluated as follows:

[0061] Spraying effect verification test: field plot tests are carried out on the foliar resistance control agents in Examples 1-3 and Comparative Examples 1-8. The test process is as follows:

[0062] Specifically:

[0063] Test site: Jiuxia Village, Hexian Town, Guixi City, Yingtan City

[0064] Test field plot: the total cadmium content of the soil was 0.73 mg / kg; the pH was 5.07, and the rice variety was the local main variety Geliangyou 1811.

[0065] Test time: late rice season in 2024

[0066] Test setup: Examples 1-3 and Comparative Examples 1-8 above are single treatment zones, respectively. The entire field is divided into 44 plots, each with an area of 20 m 2 , with 25 cm of space between plots and no field ridge. All plots are in the same field, with identical growth conditions, soil fertility, and other conditions. Every 4 plots are a treatment zone (4 replicates), a total of 11 treatment zones, and treatment zones 1-11 are the leaf surface control agents in Examples 1-3 and Comparative Examples 1-8, respectively.

[0067] The application amount of each composite leaf surface control agent is 30 kg / acre; the spraying site is the rice leaf surface and back; the spraying time of the composite leaf surface control agent is in the morning before 10 o'clock or in the afternoon after 4 o'clock on sunny or cloudy days. The suitable temperature range for spraying is 25°C.

[0068] At the tillering stage, heading stage, and filling stage of rice, respectively, each composite leaf surface control agent is sprayed onto the rice in each treatment zone using a back-type sprayer.

[0069] Other field water and fertilizer management methods and pest control methods are consistent with traditional methods. After the rice matures (early November), each plot is harvested to measure yield, collect rice, and thresh; and the cadmium content in the rice is determined.

[0070] The determination method of the cadmium content in brown rice is as follows: 0.1 g of brown rice powder sample is added with 5 mL of nitric acid and 3.0 mL of hydrogen peroxide solution, covered and cold digested overnight, digested for 2 h using a graphite digestion instrument and diluted to 25 mL, and the cadmium concentration in the digestion solution is analyzed and determined using an inductively coupled plasma mass spectrometer. The test results are shown in Table 1:

[0071] Table 1: Differences in rice yield and brown rice cadmium content of each treatment

[0072]

[0073] Note 1: In the table, the treatment methods are different, and other conventional cultivation methods are consistent.

[0074] Note 2: According to the requirements of GB 2762-2022, the cadmium content of qualified rice is less than or equal to 0.2 mg / kg.

[0075] According to the experimental results of the above-mentioned embodiments, the present application utilizes the synergistic effect among chlorinated hematin, glutathione and NaHS, uses a surfactant to expand the solubility of chlorinated hematin, and together greatly improves the cadmium reduction effect of rice brown rice, and the cadmium reduction efficiency can reach more than 90%.

[0076] To sum up, the present application discloses a kind of foliar control agent for reducing the content of cadmium in rice brown rice and its use method, relates to the field of agricultural technology;The foliar control agent component is: chlorinated hematin concentration is 3-10 μmol / L;Glutathione concentration is 0.1-1 mmol / L;NaHS concentration is 5-10 μmol / L;Sodium dodecyl sulfate SDS concentration is 3-5 mmol / L;The rest is water;Respectively in rice tillering stage, heading stage and grain filling stage, each spray the composite foliar control agent, each spray is according to the amount of 20-40 kg per mu;The present application utilizes the synergistic effect among chlorinated hematin, glutathione and NaHS, uses a surfactant to expand the solubility of chlorinated hematin, and together greatly improves the cadmium reduction effect of rice brown rice, and the cadmium reduction efficiency can reach more than 90%;The foliar control agent of the present application is simple, the component synergistic effect is outstanding, and it is simple to use, has practical use value.

[0077] At this point, those skilled in the art recognize that, although embodiments of the present application have been thoroughly illustrated and described herein, many other variations or modifications can be determined or deduced directly from the disclosure of the present application in accordance with the principles of the present application without departing from the spirit and scope of the present application. Therefore, the scope of the present application should be understood and recognized as covering all these other variations or modifications.

Claims

1. A foliar inhibitor for reducing cadmium content in brown rice, characterized in that, The foliar control component formula is: The concentration of hematin chloride is 3-10 μmol / L; the concentration of glutathione is 0.1-1 mmol / L; the concentration of NaHS is 5-10 μmol / L; the concentration of sodium dodecyl sulfate SDS is 3-5 mmol / L; and the rest is water.

2. The foliar control agent for reducing cadmium content of brown rice according to claim 1, characterized by, The foliar control component formula is: The concentration of hematin chloride is 5 μmol / L; the concentration of glutathione is 0.5 mmol / L; the concentration of NaHS is 10 μmol / L; the concentration of sodium dodecyl sulfate SDS is 5 mmol / L; and the rest is water.

3. The foliar control agent for reducing cadmium content of brown rice according to claim 1, wherein the foliar control agent is applied to the rice plant at a stage of growth at which the cadmium content of the rice plant is 0.1 to 1.0 mg per kg of dry weight. The preparation method of the foliar control agent is: According to the concentration requirements and preparation amount, hematin chloride, glutathione, NaHS, sodium dodecyl sulfate SDS and water are weighed; sodium dodecyl sulfate SDS is dissolved in water, then hematin chloride is added, and after stirring, hematin chloride is uniformly mixed, and then glutathione is added after 5-10 minutes of standing, and finally NaHS is added and stirred to obtain the foliar control agent for reducing the cadmium content of rough rice; the foliar control agent is prepared immediately and cannot be stored for more than 3 hours.

4. The method of claim 1, wherein the foliar agent is applied to the rice plant at a rate of 0.1 to 0.5 kg / ha. The use method is: The foliar control agent is sprayed at the tillering stage, the heading stage and the filling stage of rice, respectively, and the spraying amount is 20-40 kg per mu each time.

5. The method of claim 4, wherein the foliar agent is applied to the rice plant at a rate of 0.1 to 0.5 kg / ha. The spraying site is the leaf surface and the back of the leaf of rice.

6. The method of claim 4, wherein the foliar agent is applied to the rice plant at a rate of 0.1 to 0.5 kg / ha. The spraying time of the foliar control agent is before 10 o'clock in the morning or after 4 o'clock in the afternoon on sunny or cloudy days.

7. The method of claim 4, wherein the foliar spray agent is applied to the rice plant at a concentration of 0.1 to 0.5% of the total weight of the rice plant. The suitable temperature range for spraying the foliar control agent is 15-25℃.

8. The foliar control agent of any one of claims 1 to 3, wherein the foliar control agent is a foliar control agent for use in the control of a plant disease. The application of the foliar control agent in reducing the cadmium content of rough rice.

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