Preparation method and application of foliar control agent for reducing cadmium accumulation in rice

Abstract

The application provides a foliar control agent for reducing cadmium accumulation in rice as well as a preparation method and application thereof, and belongs to the technical field of rice planting. The foliar control agent comprises the following raw materials in the following concentrations: 2-4 g / L zinc sulfate, 1-2 g / L manganese sulfate, 1-1.5 g / L cysteine and 0.008%-0.012% v / v Tween 80. The foliar control agent can efficiently inhibit the absorption and transport of cadmium in rice, significantly reduce the accumulation of cadmium in rice grains, and ensure food safety. The foliar control agent can be sprayed by a drone, which is fast and time-saving. The foliar control agent is environmentally friendly, and the raw materials are simple and easy to obtain, so the foliar control agent has significant popularization and application value.

Description

Technical Field

[0001] This invention belongs to the field of rice cultivation technology, and in particular relates to a foliar inhibitor for reducing cadmium accumulation in rice and its preparation and application methods. Background Technology

[0002] Cadmium (Cd) is a highly toxic heavy metal pollutant widely found in soil. Cadmium pollution in paddy field soil has become a major environmental problem threatening food security and human health. Rice is one of the most important food crops, playing a crucial role in national food security. As the staple food source for more than half of the population, rice is highly susceptible to exceeding national food safety standards due to its unique physiological characteristics—its roots have a significant ability to activate and absorb cadmium under flooded reducing conditions, and it is efficiently transported to the grains through the vascular system. Long-term consumption of rice with excessive cadmium levels can lead to chronic accumulation of cadmium in the human body (especially in the kidneys and bones), which not only damages kidney function and interferes with calcium and phosphorus metabolism, but is also closely related to the risk of cardiovascular disease, osteoporosis, and even cancer, posing a persistent threat to children's development and adult health.

[0003] Currently, agronomic regulation is the most commonly used technical measure for safe production in cadmium-contaminated farmland. Agronomic regulation refers to using agronomic measures to control the availability of heavy metals in the soil, reducing the transfer of heavy metals to the edible parts of crops, thereby ensuring the safe production of agricultural products and realizing the safe utilization of contaminated arable land. It mainly includes measures such as water management regulation, optimized fertilization regulation, foliar barrier regulation, and tillage method regulation. Agronomic regulation measures do not affect agricultural production and farmers' income in polluted areas, allowing for "production and remediation simultaneously." They are characterized by simple operation, low cost, and mature technology, and have relatively low damage to the soil environment and potential risks, making them suitable for large-scale promotion and application. This is the basic technical path for achieving the safe utilization of regionally large-scale farmland with mild heavy metal contamination. Foliar barrier technology involves spraying barrier agents (physiological antagonistic elements or physiologically active substances containing humic acid, etc.) on the leaves to alter the transport and distribution of heavy metals within crops, controlling the transfer of heavy metals to edible parts, and improving the safety and quality of agricultural products. Due to its low cost, environmental friendliness, ease of implementation, and suitability for large-scale field application, foliar spraying has become a preferred method for the safe utilization of cadmium-contaminated farmland, especially when applied appropriately to increase crop yields. Furthermore, the rapid development of drone technology in recent years has reduced the cost of foliar spraying, making it one of the most widely used technologies in the field. However, existing foliar control agents still face significant bottlenecks in practical applications. Most products have complex compositions (containing various trace elements, organic acids, polymers, etc.), and their control effects are greatly affected by environmental conditions, rice varieties, and the degree of pollution, exhibiting inconsistent stability. This leads to significant fluctuations in effectiveness and limited universality under actual field conditions. For paddy fields with high levels of pollution or complex soil-rice system coupling mechanisms, existing control agents often struggle to stably and efficiently ensure that the cadmium content of rice meets standards, limiting the large-scale standardized application of this technology.

[0004] Therefore, developing a foliar inhibitor with high control efficiency, simple and readily available ingredients, and the ability to effectively reduce cadmium accumulation in rice is of great practical significance for promoting the safe utilization of cadmium-contaminated farmland and ensuring the quality and safety of rice. Summary of the Invention

[0005] In view of this, one of the objectives of the present invention is to provide a foliar inhibitor for reducing cadmium accumulation in rice.

[0006] A second objective of this invention is to provide a method for preparing the leaf surface control agent.

[0007] A third objective of this invention is to provide the application of the foliar inhibitor or the preparation method described therein in reducing cadmium accumulation in rice.

[0008] The fourth objective of this invention is to provide a method for reducing cadmium accumulation in rice.

[0009] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A foliar inhibitor for reducing cadmium accumulation in rice, the foliar inhibitor comprising the following raw materials at the following concentrations: 2-4 g / L zinc sulfate, 1-2 g / L manganese sulfate, 1-1.5 g / L cysteine, and 0.008%-0.012% v / v Tween 80.

[0010] Preferably, the leaf surface inhibitor comprises the following raw materials at the following concentrations: 2.5~3.5 g / L zinc sulfate, 1.25~1.75 g / L manganese sulfate, 1.2~1.3 g / L cysteine ​​and 0.009%~0.011% v / v Tween 80.

[0011] Preferably, the leaf surface inhibitor comprises the following raw materials at the following concentrations: 3 g / L zinc sulfate, 1.5 g / L manganese sulfate, 1.25 g / L cysteine ​​and 0.01% v / v Tween 80.

[0012] The present invention also provides a method for preparing the leaf surface control agent, wherein zinc sulfate, manganese sulfate, cysteine ​​and Tween 80 are dissolved in a solvent in proportion and mixed evenly to obtain the leaf surface control agent.

[0013] Preferably, the solvent includes water.

[0014] The present invention also provides the application of the leaf surface inhibitor or the preparation method thereof in reducing cadmium accumulation in rice.

[0015] Preferably, the reduction of cadmium accumulation in rice refers to reducing the accumulation of cadmium in rice grains.

[0016] The present invention also provides a method for reducing cadmium accumulation in rice, comprising spraying the foliar inhibitor twice during the rice booting stage to the rice grain filling stage.

[0017] Preferably, the application rate of the foliar inhibitor is 30-40 L / mu.

[0018] Preferably, spraying is carried out using a drone with a flight speed of 5-7 m / s.

[0019] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a foliar inhibitor to reduce cadmium accumulation in rice. It effectively inhibits the absorption and translocation of cadmium by rice, significantly reducing cadmium accumulation in grains and ensuring food safety. This foliar inhibitor is environmentally friendly; after spraying, it reduces cadmium in rice grains without significantly affecting the content of Zn, Mn, Ca, Mg, Cu, and Fe in the rice. This foliar inhibitor provides a practical technology for the safe utilization of cadmium-contaminated farmland, contributing to safe food production and offering both economic and ecological benefits. Detailed Implementation

[0020] This invention provides a foliar inhibitor for reducing cadmium accumulation in rice. The foliar inhibitor comprises the following raw materials at concentrations of: 2-4 g / L zinc sulfate, 1-2 g / L manganese sulfate, 1-1.5 g / L cysteine, and 0.008%-0.012% v / v Tween 80. Preferably, the foliar inhibitor comprises the following raw materials at concentrations of: 2.5-3.5 g / L zinc sulfate, 1.25-1.75 g / L manganese sulfate, 1.2-1.3 g / L cysteine, and 0.009%-0.011% v / v Tween 80. More preferably, the foliar inhibitor comprises the following raw materials at concentrations of: 3 g / L zinc sulfate, 1.5 g / L manganese sulfate, 1.25 g / L cysteine, and 0.01% v / v Tween 80. In the leaf surface inhibition control agent of the present invention, the zinc sulfate is preferably ZnSO4·7H2O, containing 22.648% (65 / 287) Zn; the manganese sulfate is preferably MnSO4·H2O, with a molecular weight of 169, containing 32.544% (55 / 169) Mn; and the cysteine ​​is preferably C3H7NO2S, with a molecular weight of 121.

[0021] This invention also provides a method for preparing the leaf surface inhibitor, wherein zinc sulfate, manganese sulfate, cysteine, and Tween 80 are dissolved in a solvent in a certain proportion and mixed evenly to obtain the leaf surface inhibitor; the solvent preferably includes water. The method for preparing the leaf surface inhibitor of this invention is simple, the raw materials are readily available, and it has significant value for widespread application.

[0022] This invention also provides the application of the foliar inhibitor or the preparation method described above in reducing cadmium accumulation in rice, preferably reducing cadmium accumulation in rice grains. Cadmium is highly toxic and easily migrates. After being absorbed by rice roots, cadmium is transported to various organs and accumulates there. Leaves are important nutrient organs for rice, capable of absorbing exogenous substances and transporting them to various parts of the rice plant. This invention has found that spraying the foliar inhibitor provided by this invention during rice growth can effectively inhibit the absorption and transfer of cadmium by rice, thereby significantly reducing cadmium accumulation in the edible parts of rice (rice grains).

[0023] This invention also provides a method for reducing cadmium accumulation in rice, comprising spraying the foliar inhibitor twice during the rice's booting to grain-filling stage, preferably with an interval of 5-8 days between the two sprays; the preferred application rate of the foliar inhibitor is 30-40 L / mu, more preferably 32 L / mu. When the rice used in this invention is single-season mid-season rice, the foliar inhibitor is preferably sprayed during the booting to grain-filling stage; when the rice is late-season rice, the foliar inhibitor is preferably sprayed during the heading to grain-filling stage. This invention preferably uses a drone for spraying, with the drone's flight speed preferably 5-7 m / s, more preferably 6 m / s. This invention preferably completes the spraying before the rice reaches waxy maturity, avoiding the midday heat, and choosing to spray before 10:00 AM or after 4:00 PM. If moderate to heavy rain occurs within 24 hours after spraying, re-spraying is necessary. This invention can be applied to rice in the middle and late stages of growth using a "one-spray-multiple-promotes" technique. This technique involves mixing the product of this invention with foliar fertilizers, plant growth regulators, stress-resistant agents, insecticides, fungicides, and other drugs for spraying. This can achieve multiple effects, effectively reducing cadmium, preventing diseases, and increasing yield.

[0024] This invention, by spraying the foliar inhibitor of this invention during the heading to grain-filling stage of rice growth, can effectively inhibit the accumulation of cadmium in rice roots to the ground, enhance the rice's tolerance to cadmium, and reduce the cadmium concentration in rice grains. This invention can effectively increase the yield of rice planted in cadmium-contaminated soil and reduce the accumulation of cadmium in rice.

[0025] The technical solutions provided by the present invention will be described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0026] Example 1 A foliar inhibitor that reduces cadmium accumulation in rice.

[0027] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 3 g / L zinc sulfate, 1.5 g / L manganese sulfate, 1.25 g / L cysteine, and 0.01% v / v Tween 80. Specifically, the zinc sulfate is ZnSO4·7H2O, containing 22.648% Zn (65 / 287); the manganese sulfate is MnSO4·H2O, with a molecular weight of 169, containing 32.544% Mn (55 / 169); and the cysteine ​​is C3H7NO2S, with a molecular weight of 121.

[0028] The preparation method is as follows: Zinc sulfate, manganese sulfate, cysteine, and Tween 80 are dissolved in water in a certain proportion to achieve the working concentration of each raw material. The mixture is then thoroughly mixed to obtain the leaf surface inhibitor.

[0029] Example 2 A foliar inhibitor that reduces cadmium accumulation in rice.

[0030] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 3.5 g / L zinc sulfate, 2 g / L manganese sulfate, 1 g / L cysteine, and 0.008% v / v Tween 80. Specifically, the zinc sulfate is ZnSO4·7H2O, containing 22.648% Zn (65 / 287); the manganese sulfate is MnSO4·H2O, with a molecular weight of 169, containing 32.544% Mn (55 / 169); and the cysteine ​​is C3H7NO2S, with a molecular weight of 121.

[0031] The preparation method is the same as in Example 1.

[0032] Example 3 A foliar inhibitor that reduces cadmium accumulation in rice.

[0033] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 2 g / L zinc sulfate, 1.2 g / L manganese sulfate, 1.4 g / L cysteine, and 0.011% v / v Tween 80. Specifically, the zinc sulfate is ZnSO4·7H2O, containing 22.648% Zn (65 / 287); the manganese sulfate is MnSO4·H2O, with a molecular weight of 169, containing 32.544% Mn (55 / 169); and the cysteine ​​is C3H7NO2S, with a molecular weight of 121.

[0034] The preparation method is the same as in Example 1.

[0035] Example 4 A method to reduce cadmium accumulation in rice.

[0036] During the period from the booting stage to the grain filling stage of rice, the foliar inhibitor was sprayed twice, with an interval of 8 days between the two sprays. The amount of each spray was 32L / mu. The spraying was carried out by drone, with the drone flying at a speed of 6m / s.

[0037] Comparative Example 1 A foliar inhibitor that reduces cadmium accumulation in rice.

[0038] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 3 g / L zinc sulfate and 0.01% v / v Tween 80. The zinc sulfate is ZnSO4·7H2O, containing 22.648% Zn (65 / 287).

[0039] The preparation method is as follows: Zinc sulfate and Tween 80 were dissolved in water in a certain proportion to make the concentration of each raw material its working concentration, and then mixed evenly to obtain the leaf surface inhibitor.

[0040] Comparative Example 2 A foliar inhibitor that reduces cadmium accumulation in rice.

[0041] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 1.5 g / L manganese sulfate and 0.01% v / v Tween 80. The manganese sulfate is MnSO4·H2O with a molecular weight of 169 and contains 32.544% Mn (55 / 169).

[0042] The preparation method is as follows: Manganese sulfate and Tween 80 were dissolved in water in a certain proportion to make the concentration of each raw material its working concentration, and then mixed evenly to obtain the leaf surface inhibitor.

[0043] Comparative Example 3 A foliar inhibitor that reduces cadmium accumulation in rice.

[0044] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 3 g / L manganese sulfate and 0.01% v / v Tween 80. The manganese sulfate is MnSO4·H2O with a molecular weight of 169, containing 32.544% Mn (55 / 169).

[0045] The preparation method is as follows: Manganese sulfate and Tween 80 were dissolved in water in a certain proportion to make the concentration of each raw material its working concentration, and then mixed evenly to obtain the leaf surface inhibitor.

[0046] Comparative Example 4 A foliar inhibitor that reduces cadmium accumulation in rice.

[0047] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 1.25 g / L cysteine ​​and 0.01% v / v Tween80. The cysteine ​​is C3H7NO2S with a molecular weight of 121.

[0048] The preparation method is as follows: Cysteine ​​and Tween 80 were dissolved in water in a certain proportion to make the concentration of each raw material its working concentration, and then mixed evenly to obtain the leaf surface inhibitor.

[0049] Comparative Example 5 A foliar inhibitor that reduces cadmium accumulation in rice.

[0050] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 3 g / L zinc sulfate, 1.5 g / L manganese sulfate, and 0.01% v / v Tween 80. Specifically, the zinc sulfate is ZnSO4·7H2O, containing 22.648% Zn (65 / 287); the manganese sulfate is MnSO4·H2O, with a molecular weight of 169, containing 32.544% Mn (55 / 169).

[0051] The preparation method is as follows: Zinc sulfate, manganese sulfate, and Tween 80 are dissolved in water in a certain proportion to achieve the working concentration of each raw material. The mixture is then thoroughly mixed to obtain the leaf surface inhibitor.

[0052] Comparative Example 6 A foliar inhibitor that reduces cadmium accumulation in rice.

[0053] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 3 g / L zinc sulfate, 3 g / L manganese sulfate, and 0.01% v / v Tween 80. Specifically, the zinc sulfate is ZnSO4·7H2O, containing 22.648% Zn (65 / 287); the manganese sulfate is MnSO4·H2O, with a molecular weight of 169, containing 32.544% Mn (55 / 169).

[0054] The preparation method is as follows: Zinc sulfate, manganese sulfate, and Tween 80 are dissolved in water in a certain proportion to achieve the working concentration of each raw material. The mixture is then thoroughly mixed to obtain the leaf surface inhibitor.

[0055] Comparative Example 7 A foliar inhibitor that reduces cadmium accumulation in rice.

[0056] The leaf surface inhibitor is composed of the following raw materials at the following concentrations: 3 g / L zinc sulfate, 3 g / L manganese sulfate, 1.25 g / L cysteine, and 0.01% v / v Tween 80. Specifically, the zinc sulfate is ZnSO4·7H2O, containing 22.648% Zn (65 / 287); the manganese sulfate is MnSO4·H2O, with a molecular weight of 169, containing 32.544% Mn (55 / 169); and the cysteine ​​is C3H7NO2S, with a molecular weight of 121.

[0057] The preparation method is as follows: Zinc sulfate, manganese sulfate, cysteine, and Tween 80 are dissolved in water in a certain proportion to achieve the working concentration of each raw material. The mixture is then thoroughly mixed to obtain the leaf surface inhibitor.

[0058] Example 5 The effects of different foliar inhibitors on rice.

[0059] (1) The leaf surface control agents provided in Example 1 and Comparative Examples 1 to 7 were tested respectively, with 0.01% v / v Tween 80 solution as control.

[0060] Test site: Cadmium-contaminated soil in Rongheqiao Community, Beishan Town, Changsha County (Xiangtianwan Group, total cadmium content of soil is 1 mg / kg).

[0061] Rice variety: Xiangzaoxian 24.

[0062] Experimental design: One cell per treatment, four replicates per treatment, for a total of 36 cells, with a cell area of ​​7.8 m². 2 (2.6 × 3.0 m) 2 ).

[0063] The row spacing of rice plants is 0.2 × 0.2 m, that is, each plot is planted with 14 × 16 = 224 clumps of rice.

[0064] Fertilizer application rates: N 10 kg / mu, P2O5 5 kg / mu, K2O 6 kg / mu. Apply Yangfeng compound fertilizer (N-P2O5-K2O, total nutrients ≥45%, 15-15-15) 33.34 kg / mu, urea 10.87 kg / mu, and potassium chloride 1.667 kg / mu as base fertilizer. Apply the base fertilizer one day before transplanting. After applying the base fertilizer to the field surface, mix it manually with the topsoil using a field rake before transplanting the rice seedlings.

[0065] Base fertilizer was applied on April 14, 2022; rice seedlings were transplanted on April 19, 2022; the first foliar spray was applied on June 7, 2022; and the second foliar spray was applied on June 15, 2022. Each application was at a rate of 32 L / mu (approximately 0.067 hectares), using drones with a flight speed of 6 m / s. Sampling and yield measurement were conducted on July 12, 2022: the yield of rice in each plot was measured, as well as the content of cadmium, zinc, manganese, calcium, magnesium, copper, and iron in the rice. The results are shown in Table 1.

[0066] Table 1. Rice yield and element content in rice.

[0067] Note: The data in the table are mean ± standard error, and statistical analysis was performed using the Tukey HSD method.

[0068] According to the results in Table 1, foliar spraying of the inhibitor can improve rice yield to a certain extent. Compared with the control, the rice yields of Comparative Examples 2, 3, 4, 5, 6, Example 1, and 7 increased by 4.73%, 1.97%, 2.65%, 3.72%, 2.67%, 3.36%, and 11.31%, respectively.

[0069] Foliar spraying of the inhibitor reduced the Cd content in rice. The Cd content in rice treated with Comparative Examples 1, 2, 3, 4, 5, 6, Example 1, and 7 decreased by 4.14%, 6.61%, 10.13%, 9.87%, 4.41%, 7.05%, 23.08% (p<0.05), and 0.44%, respectively. It is evident that single spraying of high concentrations of Mn and cysteine ​​effectively reduced Cd in rice. The combined application of Zn and Mn was more effective in reducing Cd than single spraying of Zn, but less effective than single spraying of Mn. The combined application of Zn and Mn increased the Cd-reducing effect with increasing Mn dosage. However, the combined application of Zn, Mn, and Cys decreased the Cd-reducing effect with increasing Mn dosage. Spraying the foliar inhibitor provided by this invention can significantly reduce the Cd content in rice, with a reduction of over 20%.

[0070] Foliar application of inhibitors had no significant effect on the Mn, Ca, Mg, and Fe contents of rice. Single application of Zn, Mn, and Cys all increased the Zn content of rice to some extent, but the differences were not significant.

[0071] The foliar inhibitor provided by this invention reduces the Cd content in rice by more than 20%, and has no significant effect on rice yield or the content of Zn, Mn, Ca, Mg, Cu and Fe in rice. It is a good foliar inhibitor for reducing the Cd content in rice.

[0072] (2) Comparative experiments were conducted using five commercially available cadmium-blocking agents: Bangyiji Golden Nano Silicon Fertilizer (B1, Inner Mongolia Yongbang Pharmaceutical Co., Ltd.), Chenhe Organic Fertilizer (Cadmium-reducing and Selenium-enhancing Functional Type) (C1, Shandong Chenhe Biotechnology Co., Ltd.), Fugui Amphiphilic Nano Silicon Fertilizer (F1, Jingmen Jiafutian Agricultural Materials Co., Ltd.), Nongxike Nano Selenium-enriched Cadmium-reducing Nutrient Agent (N1, China Agricultural Selenium Science and Technology Research Institute), and Xishi Lvkang Leaf Surface Control Agent (X1, Enshi Lvkang Agricultural Technology Co., Ltd.). The commercially available products were applied according to the methods given in their respective instructions. Local farmers' routine management practices were adopted, with no leaf surface control agent used as a control.

[0073] Test site: Cadmium-contaminated soil in Rongheqiao Community, Beishan Town, Changsha County (Xiangtianwan Group, total cadmium content of soil is 1 mg / kg).

[0074] Rice variety: Zhenliangyou 8612.

[0075] Experimental design: Field plot experiment, with each foliar inhibitor as a treatment, and a plot area of ​​30 m². 2(Length-to-width ratio 5m:6m). Each treatment was replicated 4 times in a randomized block design. The field ridges between plots were 20 cm high and covered with plastic film up to 20 cm below the soil surface to prevent cross-contamination of fertilizer and water. Each plot was irrigated individually.

[0076] Fertilizer application: Apply 30.0 kg / mu of rice-specific compound fertilizer (N-P2O5-K2O, total nutrients ≥40%, 20-8-12) as base fertilizer, 7.5 kg / mu of urea, and 5.0 kg / mu of potassium chloride. Apply the base fertilizer one day before transplanting. After applying the base fertilizer to the field surface, mix it manually with the topsoil using a field rake before transplanting the rice seedlings.

[0077] Rice cultivation management: Late-season rice will be planted, sown on June 26, 2025; plowing and preparation of the field, plot setting and fertilization will be carried out on July 23; transplanting will be done on July 28, with a density of 16,000 seedlings / 667m². 2 On August 6th, topdressing with fertilizer and herbicide was applied. The first foliar spraying was conducted on September 10th, 2025, followed by a second foliar spraying on September 17th, 2025. Each spraying was applied at a rate of 32 L / mu (approximately 0.067 hectares), using drones with a flight speed of 6 m / s. Pest and disease control was conducted twice during the late-season rice growing season, on August 13th and September 25th, with virtually no pests or diseases occurring during this period. Yield was measured on October 23rd, and harvesting took place on October 26th. The yield of each treatment and the cadmium content in the rice were measured, and the rice yield increase rate and cadmium reduction rate were calculated. Yield increase rate (%) = (Treatment group yield - Control group yield) / Control group yield × 100%; Cadmium reduction rate (%) = (Treatment group rice cadmium content - Control group rice cadmium content) / Control group rice cadmium content × 100%. The results are shown in Table 2.

[0078] Table 2. Decrease in cadmium levels in rice and increase in rice yield.

[0079] As shown in Table 2, foliar spraying of the inhibitor can effectively reduce the cadmium concentration in rice to a certain extent. Compared with the control, all five commercially available inhibitors used have the ability to inhibit cadmium absorption in rice. The cadmium reduction in rice, from highest to lowest, was as follows: B1 (42.71%) > N1 (31.25%) > X1 (27.37%) > C1 (23.45%) > F1 (13.19%). Spraying the foliar inhibitor provided by this invention (Example 1) reduced the Cd content in rice by 47.52%, which is superior to the cadmium reduction effect of the other five foliar inhibitors, making it a better foliar inhibitor for reducing Cd content in rice.

[0080] Foliar application of inhibitors has an impact on rice yield. Compared to the control, four inhibitors (B1, N1, F1, and X1) reduced rice yield, while C1 increased yield by 0.71%. The foliar inhibitor provided by this invention (Example 1) increased yield by 0.63%.

[0081] In summary, the foliar inhibitor provided by this invention can effectively reduce the cadmium content in rice while also promoting rice yield, which is beneficial for promoting the safe utilization of cadmium-contaminated farmland, ensuring rice quality and safety, and increasing rice production.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A foliar inhibitor for reducing cadmium accumulation in rice, characterized in that, The leaf surface inhibitor comprises the following raw materials at the following concentrations: 2-4 g / L zinc sulfate, 1-2 g / L manganese sulfate, 1-1.5 g / L cysteine, and 0.008%-0.012% v / v Tween 80.

2. The leaf surface inhibition control agent according to claim 1, characterized in that, The leaf surface inhibitor comprises the following raw materials at the following concentrations: 2.5~3.5 g / L zinc sulfate, 1.25~1.75 g / L manganese sulfate, 1.2~1.3 g / L cysteine, and 0.009%~0.011% v / v Tween 80.

3. The leaf surface inhibition control agent according to claim 2, characterized in that, The leaf surface inhibitor comprises the following raw materials at the following concentrations: 3 g / L zinc sulfate, 1.5 g / L manganese sulfate, 1.25 g / L cysteine, and 0.01% v / v Tween 80.

4. A method for preparing the leaf surface inhibition agent according to any one of claims 1 to 3, characterized in that, Zinc sulfate, manganese sulfate, cysteine, and Tween 80 are dissolved in a solvent in a certain proportion and mixed evenly to obtain a leaf surface inhibitor.

5. The preparation method according to claim 4, characterized in that, The solvent includes water.

6. The application of the leaf surface inhibitor according to any one of claims 1 to 3 or the preparation method according to claim 4 or 5 in reducing cadmium accumulation in rice.

7. The application according to claim 6, characterized in that, The reduction of cadmium accumulation in rice refers to reducing the accumulation of cadmium in rice grains.

8. A method for reducing cadmium accumulation in rice grains, characterized in that, This includes spraying the foliar inhibitor described in any one of claims 1 to 3 twice during the period from the booting stage to the grain-filling stage of rice.

9. The method for reducing cadmium accumulation in rice grains according to claim 8, characterized in that, The application rate of the foliar inhibitor is 30-40 L / mu.

10. The method for reducing cadmium accumulation in rice grains according to claim 9, characterized in that, The spraying is carried out using drones, with the drones flying at a speed of 5-7 m / s.

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