Anti-ultraviolet agricultural biomass liquid film spraying agent as well as preparation and application thereof

Abstract

The invention relates to an anti-ultraviolet agricultural biomass liquid film spraying agent as well as preparation and application thereof. The environment-friendly biological fertilizer is prepared from the following components in parts by weight: 10 to 30 parts of a film aid, 1 to 15 parts of humic acid, 1 to 15 parts of a cross-linking agent, 1 to 10 parts of a biomass-based film forming material, 1 to 15 parts of a pH regulator, 1 to 10 parts of a plasticizer, 5 to 20 parts of lignosulfonate, 0.1 to 5 parts of biomass charcoal and 75 to 900 parts of a solvent. The anti-ultraviolet agricultural biomass liquid film spraying agent has the advantages of ultraviolet resistance, scouring resistance, heat preservation, soil moisture conservation, soil fertility enhancement and degradability, can provide a good colonization environment for biocontrol bacteria, can reduce the damage of direct ultraviolet irradiation to the biocontrol bacteria after being mixed with the biocontrol bacteria, is beneficial to enhancing the control effect of the biocontrol bacteria and the like, and is simple in preparation process, low in cost and suitable for industrial production. The cost is low.

Description

Technical Field

[0001] The present application belongs to the field of agricultural production technology, and specifically relates to an anti-ultraviolet agricultural biomass liquid spray agent and its preparation and application. Background Art

[0002] In agricultural production, the application of plastic mulch technology has significantly increased crop yields and planting efficiency. However, traditional plastic mulch is significantly affected by the external environment during use. Long-term exposure to wind and sun can lead to aging and cracking, which weakens its ability to increase warmth and retain moisture. Furthermore, the installation and recycling of plastic mulch requires significant manpower and resources. Uncollected film residues can form a physical barrier on the soil surface, hindering the normal root growth of subsequent crops. Long-term accumulation of film residues can also damage the soil's ecological structure, becoming a significant obstacle to sustainable agricultural development. Furthermore, biocontrol agents (such as antagonistic and growth-promoting bacteria) face numerous challenges in practical application, including inactivation by ultraviolet light and limited soil nutrients that restrict their colonization and function, ultimately resulting in unsatisfactory biocontrol effectiveness. Furthermore, the use of chemical pesticides in pest and weed control is plagued by rapid photodegradation, leaching, and a short shelf life. This leads to increased frequency of application, higher dosages, and increased environmental pollution risks. To address these issues, biomass-based liquid mulch technology has gained increasing attention in recent years. This type of liquid mulch not only inherits the advantages of traditional plastic mulch in terms of heat absorption, warming, moisture retention, and seedling promotion, but also possesses excellent UV resistance, nutrient compensation, and biodegradability, effectively alleviating the problem of "white pollution" and possessing excellent ecological adaptability and development prospects. Based on this, a new type of film-forming biomass spray—"Invisible Protective Clothing"—has been developed. This spray can be used synergistically with agricultural inputs such as biocontrol bacteria or chemical pesticides. Through physical compounding, it imparts multiple functions to agricultural inputs, including UV protection, microenvironmental regulation, nutrient replenishment, and slow / controlled release, significantly improving their stability and long-lasting effectiveness. This strategy not only enhances the effectiveness of agricultural inputs in complex environments but also expands the functional boundaries of liquid mulch materials, promoting their development into intelligent carrier platforms for synergistic pesticide / fertilizer efficiencies. However, the current development of liquid mulch materials still faces many shortcomings. For example, the use of asphalt emulsion as a raw material for ground film in traditional technologies is not only costly but also poses a potential risk of environmental pollution. Although another type of technology has achieved the preparation of degradable liquid films, the process is complex and transportation is inconvenient, making it difficult to promote and apply. In addition, some liquid ground film formulas contain polyurethane prepolymers or acrylic modified materials, which may have toxic effects on biocontrol bacteria, affecting their metabolic activity and field colonization ability. Therefore, focusing on the bottleneck problems of the ecological environment and application performance of traditional plastic ground films and existing liquid ground films, the development of a multifunctional degradable liquid spray agent with simple process, low cost, eco-friendly and synergistic effect with agricultural inputs will provide important technical support for promoting the development of green agriculture and reducing the amount of agricultural inputs and increasing their efficiency. Summary of the Invention

[0003] Based on this, the present application provides a UV-resistant agricultural biomass liquid spray agent, as well as its preparation and application. This liquid spray agent not only exhibits excellent scour resistance, heat and moisture retention, and soil fertility enhancement, but also exhibits good biodegradability, effectively enhancing the UV resistance and soil colonization efficiency of biocontrol bacteria in the field.

[0004] The technical solutions of this application to solve the above technical problems are as follows:

[0005] In one aspect of the present application, an anti-ultraviolet agricultural biomass liquid spray agent is provided, which includes the following components, by weight: 10 to 30 parts of a film-forming agent, 1 to 15 parts of humic acid, 1 to 15 parts of a cross-linking agent, 1 to 10 parts of a biomass-based film-forming material, 1 to 15 parts of a pH regulator, 1 to 10 parts of a plasticizer, 5 to 20 parts of lignin sulfonate, 0.1 to 5 parts of biochar, and 75 to 900 parts of a solvent.

[0006] In some embodiments, the following components are included: 10 to 30 parts of a film-forming agent, 10 to 15 parts of humic acid, 10 to 15 parts of a cross-linking agent, 1 to 10 parts of a biomass-based film-forming material, 10 to 15 parts of a pH regulator, 1 to 10 parts of a plasticizer, 5 to 20 parts, 0.1 to 3 parts of lignin sulfonate, and 90 to 850 parts of a solvent.

[0007] In some embodiments, the film-aiding agent includes one or more of polyvinyl alcohol, polyvinyl pyrrolidone and hydroxypropyl methylcellulose;

[0008] and / or, the humic acid comprises fulvic acid;

[0009] And / or, the cross-linking agent includes one or more of citric acid, polyacrylic acid and succinic acid.

[0010] In some embodiments, the lignin sulfonate comprises one or more of sodium lignin sulfonate and calcium lignin sulfonate;

[0011] and / or, the pH adjuster comprises alkaline lignin;

[0012] and / or, the biomass-based film-forming material comprises one or more of sodium carboxymethyl cellulose, oxidized starch, xanthan gum, guar gum, sodium alginate, pulp waste liquid, tobacco waste liquid and gelatin aqueous solution;

[0013] and / or, the plasticizer comprises glycerol;

[0014] And / or, the biochar is derived from one or more of straw, egg shells, fallen leaves, orange peels, peanut shells, cotton shells and walnut shells;

[0015] And / or, the solvent comprises water.

[0016] Another aspect of the present application provides a method for preparing an anti-ultraviolet agricultural biomass liquid spray agent, comprising the following steps:

[0017] The components of the above-mentioned anti-ultraviolet agricultural biomass liquid spray agent are mixed and prepared.

[0018] In some embodiments, mixing comprises the steps of:

[0019] Mixing the film-forming agent, the cross-linking agent, the humic acid and a portion of the solvent to prepare a first mixed solution;

[0020] Mixing the biomass-based film-forming material, the pH adjuster, the lignin sulfonate, the plasticizer, and another portion of the solvent to prepare a second mixed solution; and

[0021] The first mixed liquid, the second mixed liquid, the remaining portion of the solvent and the biochar are mixed to prepare the anti-ultraviolet agricultural biomass liquid spray agent.

[0022] On the other hand, the present application provides a use of the above-mentioned UV-resistant agricultural biomass liquid spray agent in crop planting.

[0023] In some embodiments, the application amount of the UV-resistant agricultural biomass liquid spray agent is 350 kg / mu to 450 kg / mu.

[0024] In some embodiments, the method comprises mixing the anti-ultraviolet agricultural biomass liquid spray agent with a biocontrol fungicide.

[0025] In some embodiments, the mass ratio of the anti-ultraviolet agricultural biomass liquid spray agent to the biocontrol fungicide is 100:(0.05~0.15).

[0026] The anti-ultraviolet agricultural biomass liquid spray agent in this application is composed of specific components in a specific ratio. Among them, lignin sulfonate is cross-linked with the biomass film-forming material, which can significantly improve the mechanical strength of the film layer; humic acid, as a natural organic acid, has excellent antioxidant and ultraviolet absorption properties. Its introduction not only enhances the ultraviolet blocking ability of the film, but also improves soil fertility and reduces the damage of ultraviolet rays to biocontrol bacteria. At the same time, it promotes the reproduction and colonization of biocontrol bacteria in the soil through the supplementation of organic matter, and prolongs its active period in the field; in addition, biochar, as a soil conditioner, has both light and heat regulation functions, which can optimize the living environment of biocontrol bacteria and maintain a suitable soil temperature, thereby further improving the prevention and control effect. Through the coordinated cooperation of the various components in a specific ratio, the micro-nano structure formed on the surface of the film further enhances its anti-ultraviolet, erosion resistance, heat preservation and moisture retention functions. This innovative design provides superior performance guarantees for the practical application of liquid spray agents and has broad application potential.

[0027] The preparation process of the UV-resistant agricultural biomass liquid spray agent is simple and easy to implement, and the prepared UV-resistant agricultural biomass liquid spray agent can meet the needs of existing agricultural production. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a photo of the biomass-based multifunctional degradable film-forming liquid prepared in Example 2;

[0029] Figure 2 This is a picture showing the effect of spraying the liquid film spraying agent prepared in Example 2 on the soil surface indoors;

[0030] Figure 3 This is a picture showing the effect of spraying the liquid film spraying agent prepared in Example 2 on the soil surface outdoors;

[0031] Figure 4 This is a graph showing the percentage of dissolution of the liquid spray agent prepared in Examples 1 to 3 in water;

[0032] Figure 5 The light transmittance results of the liquid spray agents prepared in Examples 1 to 3 are shown;

[0033] Figure 6 The contact angle results of the liquid spray agent prepared in Examples 1 to 3 with water are shown in FIG.

[0034] Figure 7 The effects of the liquid spraying agents prepared in Examples 1 to 3 on the ground temperature after covering the soil surface;

[0035] Figure 8 The graph shows the water retention rate of the liquid spray agents prepared in Examples 1 to 3 over a period of 12 hours.

[0036] Figure 9This is a colony morphology diagram of the liquid spray agent prepared in Example 2 mixed with biocontrol bacteria after ultraviolet irradiation;

[0037] Figure 10 This is a physical picture of the biomass-based multifunctional degradable liquid spray agent prepared in Comparative Example 1. DETAILED DESCRIPTION

[0038] References to embodiments of the present application will now be provided in detail, one or more examples of which are described below. Each example is provided to illustrate, not to limit, the present application. Indeed, it will be apparent to those skilled in the art that various modifications and variations may be made to the present application without departing from the scope or spirit of the present application. For example, features illustrated or described as part of one embodiment may be used in another embodiment to produce further embodiments.

[0039] Therefore, it is intended that this application covers such modifications and variations that fall within the scope of the appended claims and their equivalents. Other objects, features, and aspects of the present application are disclosed in or are apparent from the following detailed description. Those skilled in the art will appreciate that this discussion is merely a description of exemplary embodiments and is not intended to limit the broader aspects of the present application.

[0040] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] The term "comprises", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements includes not only those elements, but also includes other elements not clearly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements limited by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method, article or equipment comprising the elements. The indefinite articles "a" and "an" before the elements or components of the present application have no restriction on the quantity requirements (i.e., the number of occurrences) of the elements or components. Therefore, "a" or "a" should be interpreted as including one or at least one, and the elements or components in the singular also include the plural form, unless the quantity obviously refers only to the singular form. The meaning of "plurality" is at least two, for example two, three, etc., unless otherwise clearly and specifically defined.

[0043] The weights of the relevant components mentioned in the examples of this application may not only refer to the specific content of each component, but also represent the proportional relationship between the weights of the components. Therefore, as long as the content of the relevant components is proportionally enlarged or reduced according to the examples of this application, it is within the scope disclosed in the examples of this application. Specifically, ‰ in the description of this application represents the thousandth sign, and the weights described in the examples of this application may be mass units known in the chemical industry, such as μg, mg, g, and kg.

[0044] Except as shown in the operating examples or otherwise indicated, all numbers used in the specification and claims to express the amount of ingredients, physicochemical properties, etc. are understood to be adjusted by the term "about" in all cases. For example, therefore, unless otherwise indicated, the numerical parameters listed in the above specification and the appended claims are approximate values, and those skilled in the art will be able to appropriately change these approximate values ​​using the teachings disclosed herein to seek to obtain the desired properties. The use of numerical ranges expressed as endpoints includes all numbers within the range and any range within the range, for example, 1 to 5 includes 1, 1.1, 1.3, 1.5, 2, 2.75, 3, 3.80, 4 and 5, etc.

[0045] One embodiment of the present application provides an anti-ultraviolet agricultural biomass liquid spray agent, which includes the following components, by weight: 10 to 30 parts of a film-forming agent, 1 to 15 parts of humic acid, 1 to 15 parts of a cross-linking agent, 1 to 10 parts of a biomass-based film-forming material, 1 to 15 parts of a pH regulator, 1 to 10 parts of a plasticizer, 5 to 20 parts of lignin sulfonate, 0.1 to 5 parts of biochar, and 75 to 900 parts of a solvent.

[0046] The anti-ultraviolet agricultural biomass liquid spray agent in this application is composed of specific components in a specific ratio. Among them, lignin sulfonate is cross-linked with the biomass film-forming material, which can significantly improve the mechanical strength of the film layer; humic acid, as a natural organic acid, has excellent antioxidant and ultraviolet absorption properties. Its introduction not only enhances the ultraviolet blocking ability of the film, but also improves soil fertility and reduces the damage of ultraviolet rays to biocontrol bacteria. At the same time, it promotes the reproduction and colonization of biocontrol bacteria in the soil through the supplementation of organic matter, and prolongs its active period in the field; in addition, biochar, as a soil conditioner, has both light and heat regulation functions, which can optimize the living environment of biocontrol bacteria and maintain a suitable soil temperature, thereby further improving the prevention and control effect. Through the coordinated cooperation of the various components in a specific ratio, the micro / nano structure formed on the surface of the ground film further enhances its anti-ultraviolet, erosion resistance, heat preservation and moisture retention functions. This innovative design provides superior performance guarantees for the practical application of liquid spray agents and has broad application potential.

[0047] It should be noted that the range of "10 to 30 parts" for the film-forming agent refers to the minimum and maximum values ​​within the range of 10 to 30 parts, as well as any values ​​between the minimum and maximum values. Specific examples include, but are not limited to, the values ​​in the embodiments and the following values: 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, 20 parts, 21 parts, 22 parts, 23 parts, 24 parts, 25 parts, 26 parts, 27 parts, 28 parts, 29 parts, or 30 parts; or a range consisting of any two of these values, including, for example, 10 to 20 parts.

[0048] The range of humic acid is "1 part to 15 parts," meaning that the minimum and maximum values ​​within the range of 1 part to 15 parts can be taken, as well as every value between the minimum and maximum values. Specific examples include, but are not limited to, the values ​​in the embodiments and the following values: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts; or a range consisting of any two of these values, including, for example, 10 parts to 15 parts.

[0049] The range of "1 part to 15 parts" for the crosslinking agent is defined as the minimum and maximum values ​​within the range of 1 part to 15 parts, as well as any values ​​between these minimum and maximum values. Specific examples include, but are not limited to, the values ​​in the Examples and the following values: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts; or a range consisting of any two of these values, including, for example, 10 parts to 15 parts.

[0050] The range of "1 part to 10 parts" for biomass-based film-forming materials refers to the minimum and maximum values ​​within the range of 1 part to 10 parts, as well as every value between the minimum and maximum values. Specific examples include, but are not limited to, the point values ​​in the embodiments and the following point values: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts; or a range consisting of any two of these values, including, for example, 5 parts to 10 parts.

[0051] The pH adjuster can be in the range of "1 part to 15 parts," meaning it can be in the range of 1 part to 15 parts, the minimum and maximum values, and every value between the minimum and maximum values. Specific examples include, but are not limited to, the values ​​in the Examples and the following values: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, or 15 parts; or a range consisting of any two of these values, including, for example, 10 parts to 15 parts.

[0052] The range of plasticizer values ​​is "1 part to 10 parts," meaning the minimum and maximum values ​​within the range of 1 part to 10 parts, as well as every value between these minimum and maximum values. Specific examples include, but are not limited to, the values ​​in the Examples and the following values: 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, or 10 parts; or a range consisting of any two of these values, including, for example, 5 parts to 10 parts.

[0053] The range of lignin sulfonate is "5 parts to 20 parts," i.e., the minimum and maximum values ​​within the range of 5 parts to 20 parts, as well as every value between the minimum and maximum values, can be taken. Specific examples include, but are not limited to, the values ​​in the examples and the following values: 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts, 12 parts, 13 parts, 14 parts, 15 parts, 16 parts, 17 parts, 18 parts, 19 parts, and 20 parts; or a range consisting of any two of these values, including, for example, 5 parts to 15 parts.

[0054] The value range of biochar is "0.1 parts to 5 parts", that is, the minimum and maximum values ​​of the range of 0.1 parts to 5 parts, as well as every value between the minimum and maximum values. Specific examples include but are not limited to the point values ​​in the embodiments and the following point values: 0.1 parts, 0.2 parts, 0.3 parts, 0.4 parts, 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1 part, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts, 1.5 parts, 1.6 parts, 1.7 parts, 1.8 parts, 1.9 parts, 2 parts, 2.1 parts, 2.2 parts, 2.3 parts, 2.4 parts, 2.5 parts, 2.6 parts, 3 parts, 3.4 parts, 3.5 parts, 3.6 parts, 3.7 parts, 3.8 parts, 3.9 parts, 4 parts, 4.1 parts, 4.2 parts, 4.3 parts, 4.4 parts, 4.5 parts, 4.6 parts, 4.7 parts, 4.8 parts, 4.9 parts or 5 parts; or a range composed of any two of these values, as an example, including 1 part to 3 parts.

[0055] The range of the solvent is "75 parts to 900 parts", that is, the minimum and maximum values ​​within the range of 75 parts to 900 parts, as well as every value between the minimum and maximum values. Specific examples include, but are not limited to, the point values ​​in the embodiments and the following point values: 75 parts, 125 parts, 175 parts, 225 parts, 275 parts, 325 parts, 375 parts, 425 parts, 475 parts, 525 parts, 575 parts, 625 parts, 675 parts, 725 parts, 775 parts, 825 parts, 850 parts, 875 parts, or 900 parts; or a range consisting of any two of these values, including, for example, 80 parts to 700 parts.

[0056] In some embodiments, the above-mentioned anti-UV agricultural biomass liquid spray agent includes the following components: 10 parts to 30 parts of a film-forming agent, 10 parts to 15 parts of humic acid, 10 parts to 15 parts of a cross-linking agent, 1 part to 10 parts of a biomass-based film-forming material, 10 parts to 15 parts of a pH regulator, 1 part to 10 parts of a plasticizer, 5 parts to 20 parts of lignin sulfonate, 0.1 parts to 3 parts of biochar, and 90 parts to 850 parts of a solvent.

[0057] In a specific example, the above-mentioned anti-UV agricultural biomass liquid spray agent includes the following components: 20 parts of film-forming agent, 10 parts of humic acid, 10 parts of cross-linking agent, 5 parts of biomass-based film-forming material, 5 parts of pH regulator, 5 parts of plasticizer, 10 parts of lignin sulfonate, 3 parts of biochar and 850 parts of solvent.

[0058] In some embodiments, the film-aiding agent includes one or more of polyvinyl alcohol, polyvinyl pyrrolidone and hydroxypropyl methylcellulose.

[0059] In some embodiments, the humic acid includes fulvic acid.

[0060] In some embodiments, the cross-linking agent includes one or more of citric acid, polyacrylic acid, and succinic acid.

[0061] In some embodiments, the pH adjuster includes alkaline lignin.

[0062] In some embodiments, the alkaline lignin is derived from pulp waste liquor.

[0063] In some embodiments, the plasticizer includes glycerin.

[0064] In some embodiments, the lignin sulfonate comprises one or more of sodium lignin sulfonate and calcium lignin sulfonate.

[0065] In some embodiments, the biomass-based film-forming material includes one or more of sodium carboxymethyl cellulose, oxidized starch, xanthan gum, guar gum, sodium alginate, pulp waste liquid, tobacco waste liquid and gelatin aqueous solution.

[0066] In some embodiments, the biochar is derived from one or more of straw, egg shells, fallen leaves, orange peels, peanut shells, cotton shells, and walnut shells.

[0067] In some embodiments, the particle size of the biochar is 250-350 mesh.

[0068] In some embodiments, the solvent includes water.

[0069] One embodiment of the present application further provides a method for preparing the above-mentioned UV-resistant agricultural biomass liquid spray agent, comprising steps S10 to S30.

[0070] Step S10: mixing the film-forming agent, the cross-linking agent, the humic acid and part of the solvent to prepare a first mixed solution.

[0071] Specifically, the above step S10 includes steps S11 and S12.

[0072] Step S11: mixing the humic acid, cross-linking agent and part of the solvent, and heating them to prepare an intermediate treatment liquid.

[0073] Step S12: adding a film-forming agent to the intermediate treatment liquid and performing a heating treatment to prepare a first mixed liquid.

[0074] In some embodiments, the temperature of the heating treatment is 50° C. to 60° C., and the heating treatment is performed while stirring.

[0075] Furthermore, the rotation speed of the stirring process is 600 r / min~700 r / min, and the stirring process time is 1h~3h.

[0076] Step S20: Mix the biomass-based film-forming material, pH regulator, lignin sulfonate, plasticizer and another portion of the solvent to prepare a second mixed solution.

[0077] Specifically, step S20 includes steps S21 to S23.

[0078] Step S21: Mix the plasticizer and part of the solvent to prepare a first treatment liquid.

[0079] In some embodiments, the mixing process is carried out by stirring.

[0080] In some embodiments, the stirring speed is 400 r / min to 500 r / min, and the stirring time is 3 min to 8 min.

[0081] Step S22: adding a pH regulator and lignin sulfonate to the first treatment liquid, mixing, and preparing a second treatment liquid.

[0082] In some embodiments, the mixing process is carried out by stirring.

[0083] In some embodiments, the stirring speed is 400 r / min to 500 r / min, and the stirring time is 1 min to 5 min.

[0084] Step S23: adding a biomass-based film-forming material to the second treatment liquid, heating and mixing the mixture to prepare the second mixed liquid.

[0085] In some embodiments, the mixing process is carried out by stirring.

[0086] In some embodiments, the stirring speed is 600 r / min to 700 r / min, and the stirring time is 20 min to 40 min.

[0087] Step S30: Mix the first mixed liquid, the second mixed liquid, the remaining portion of the solvent and the biochar to prepare the UV-resistant agricultural biomass liquid spray agent.

[0088] The preparation process of the UV-resistant agricultural biomass liquid spray agent is simple and easy to implement, and the prepared UV-resistant agricultural biomass liquid spray agent can meet the needs of existing agricultural production.

[0089] One embodiment of the present application also provides a use of the above-mentioned UV-resistant agricultural biomass liquid spray agent in crop planting.

[0090] In some embodiments, the crops include staple crops, vegetable crops, and garden crops.

[0091] In some embodiments, the application amount of the above-mentioned UV-resistant agricultural biomass liquid spray agent is 350 kg / mu to 450 kg / mu.

[0092] In some embodiments, the method comprises mixing the above-mentioned UV-resistant agricultural biomass liquid spray agent with a biocontrol fungicide.

[0093] In some embodiments, the mass ratio of the above-mentioned anti-UV agricultural biomass liquid spray agent to the above-mentioned biocontrol fungicide is 100: (0.05~0.15); for example, it can be 100:0.05, 100:0.06, 100:0.07, 100:0.08, 100:0.09, 100:0.1, 100:0.11, 100:0.12, 100:0.13, 100:0.14 or 100:0.15; or a range composed of any two of these values, as an example, including 100:0.07~100:0.1.

[0094] In some embodiments, the biocontrol bacteria include one or more of the genera Bacillus, Trichoderma, and Pseudomonas.

[0095] Furthermore, the genus Bacillus includes one or more of Bacillus thuringiensis and Bacillus subtilis.

[0096] Furthermore, the Trichoderma genus includes one or more of Trichoderma harzianum and Trichoderma viride.

[0097] In some embodiments, the application of the UV-resistant agricultural biomass liquid spray agent in the crop planting can be performed using one or more conventional sprayers or electric sprayers.

[0098] The liquid spray is made from environmentally friendly raw materials. Its main components, such as the film-forming material and lignin sulfonate, are natural polysaccharide polymers. These components not only provide organic nutrients for the colonization and reproduction of biocontrol bacteria in the soil but also effectively block ultraviolet rays, preventing their inactivation. Furthermore, the spray is naturally degraded by soil microorganisms, avoiding environmental pollution and demonstrating excellent ecological compatibility. After spraying on the surface, the liquid spray combines with soil particles, air-dries, and solidifies to form a dense film, effectively reducing ground temperature loss. When used in crop cultivation, it not only helps improve soil fertility but also promotes healthy crop growth.

[0099] The present application will be described below in conjunction with specific embodiments, but the present application is not limited to the following embodiments. It should be understood that the attached claims summarize the scope of the present application. Under the guidance of the concept of the present application, those skilled in the art should realize that certain changes made to the various embodiments of the present application will be covered by the spirit and scope of the claims of the present application.

[0100] The present application is further described below with reference to the accompanying drawings and embodiments, but the protection content of the present application is not limited to the scope described in the embodiments.

[0101] Unless otherwise specified, the experimental methods used in the following examples are conventional methods; the reagents, biological materials, etc. used in the following examples are all commercially available unless otherwise specified.

[0102] Example 1

[0103] 1. A method for preparing a first mixed solution, comprising the following steps:

[0104] (1) Add 1 part fulvic acid and 1 part citric acid to 50 parts of water, stir at room temperature until completely dissolved, and transfer to a water bath.

[0105] (2) Add 24 parts of polyvinyl alcohol to the solution in step (1), heat in a water bath at 55°C and stir at a rate of 650 r / min for 2 h until the polyvinyl alcohol is completely dissolved, to obtain a first mixed solution.

[0106] 2. A method for preparing the second mixed solution comprises the following steps:

[0107] (1) Add 7 parts of glycerol to 50 parts of aqueous solution and stir on a magnetic stirrer at 450 r / min at room temperature for 5 min until a homogeneous solution is formed.

[0108] (2) 8 parts of alkaline lignin (purchased from Solebol, product number L8500) and 13 parts of sodium lignin sulfonate were added to the solution in step (1), and the mixture was stirred on a magnetic stirrer at 450 r / min for 3 min at room temperature until the alkaline lignin and sodium lignin sulfonate were completely dissolved.

[0109] (3) Slowly add 6 parts of sodium alginate to the solution in step (2), heat in a water bath at 50°C and stir at 650 r / min for 30 min until the sodium alginate is completely dissolved to obtain a second mixed solution.

[0110] 3. Preparation of an anti-ultraviolet agricultural biomass liquid spray agent: Mix the first mixed liquid and the second mixed liquid, add 750 parts of water to dilute it, and then add 0.1 parts of biomass charcoal powder (specifically straw biomass charcoal powder, purchased from Sinopharm Group, product number CZ0000), and stir to obtain a multifunctional anti-ultraviolet agricultural biomass liquid spray agent.

[0111] Example 2

[0112] The preparation method of the UV-resistant agricultural biomass liquid spray agent in Example 2 is basically the same as that in Example 1, except that the component ratios of the UV-resistant agricultural biomass liquid spray agent are different, as follows:

[0113] 1. A method for preparing a first mixed solution, comprising the following steps:

[0114] (1) Add 10 parts of fulvic acid and 10 parts of citric acid to 50 parts of water, stir at room temperature until completely dissolved, and transfer to a water bath.

[0115] (2) Add 20 parts of film-forming agent (polyvinyl alcohol) to the solution in step (1), heat in a water bath at 55°C and stir at a rate of 650 r / min for 2 h until the film-forming agent is completely dissolved to obtain a first mixed solution.

[0116] 2. A method for preparing the second mixed solution comprises the following steps:

[0117] (1) Add 5 parts of glycerol to 50 parts of aqueous solution and stir on a magnetic stirrer at 450 r / min at room temperature for 5 min until a homogeneous solution is formed.

[0118] (2) Add 5 parts of alkaline lignin (purchased from Solebao, product number L8500) and 13 parts of sodium lignin sulfonate to the solution in step (1), and continue stirring at 450 r / min on a magnetic stirrer at room temperature for 3 min until the alkaline lignin and sodium lignin sulfonate are completely dissolved.

[0119] (3) Slowly add 5 parts of sodium carboxymethyl cellulose to the solution in step (2), heat in a water bath at 50°C and stir at a rate of 650 r / min for 30 min until the sodium carboxymethyl cellulose is completely dissolved to obtain a second mixed solution.

[0120] 3. Preparation of an anti-ultraviolet agricultural biomass liquid spray agent: Mix the first mixed liquid and the second mixed liquid, add 750 parts of water to dilute it, and then add 3 parts of biomass charcoal powder (specifically straw biomass charcoal powder, purchased from Sinopharm Group, product number CZ0000), and stir to obtain a multifunctional anti-ultraviolet agricultural biomass liquid spray agent.

[0121] Example 3

[0122] The preparation method of the UV-resistant agricultural biomass liquid spray agent in Example 3 is basically the same as that in Example 1, except that the component ratios of the UV-resistant agricultural biomass liquid spray agent are different, as follows:

[0123] 1. A method for preparing a first mixed solution, comprising the following steps:

[0124] (1) Add 15 parts of fulvic acid and 15 parts of citric acid to 50 parts of water, stir at room temperature until completely dissolved, and transfer to a water bath.

[0125] (2) 18 parts of a film-forming agent (polyvinyl alcohol) was added to the solution in step (1), and the mixture was heated in a water bath at 55°C while stirring at a rate of 650 r / min for 2 h until the film-forming agent was completely dissolved, thereby obtaining a first mixed solution.

[0126] 2. A method for preparing the second mixed solution comprises the following steps:

[0127] (1) Add 10 parts of glycerol to 50 parts of aqueous solution and stir on a magnetic stirrer at 450 r / min at room temperature for 5 min until a homogeneous solution is formed.

[0128] (2) Add 15 parts of alkaline lignin (purchased from Solebol, product number L8500) and 13 parts of sodium lignin sulfonate to the solution in step (1), and continue stirring at 450 r / min on a magnetic stirrer at room temperature for 3 min until the alkaline lignin and sodium lignin sulfonate are completely dissolved.

[0129] (3) Slowly add 5 parts of guar gum to the solution in step (2), heat in a water bath at 50°C and stir at a rate of 650 r / min for 30 min until the guar gum is completely dissolved to obtain a second mixed solution.

[0130] 3. Preparation of an anti-ultraviolet agricultural biomass liquid spray agent: Mix the first mixed liquid and the second mixed liquid, add 750 parts of water to dilute it, and then add 5 parts of biomass charcoal powder (specifically straw biomass charcoal powder, purchased from Sinopharm Group, product number CZ0000), and stir to obtain a multifunctional anti-ultraviolet agricultural biomass liquid spray agent.

[0131] Comparative Example 1

[0132] The preparation methods of the UV-resistant agricultural biomass liquid spray agent in Comparative Example 1 and Example 1 are basically the same, the only difference being that the component ratios of the UV-resistant agricultural biomass liquid spray agent are different, specifically:

[0133] 1. A method for preparing a first mixed solution, comprising the following steps:

[0134] (1) Add 1 part fulvic acid and 1 part citric acid to 50 parts of water, stir at room temperature until completely dissolved, and transfer to a water bath.

[0135] (2) Add 24 parts of polyvinyl alcohol to the solution in step (1), heat in a water bath at 55°C and stir at a rate of 650 r / min for 2 h until the polyvinyl alcohol is completely dissolved, to obtain a first mixed solution.

[0136] 2. A method for preparing the second mixed solution comprises the following steps:

[0137] (1) Add 7 parts of glycerol to 50 parts of aqueous solution and stir on a magnetic stirrer at 450 r / min at room temperature for 5 min until a homogeneous solution is formed.

[0138] (2) 8 parts of alkaline lignin (purchased from Solebol, product number L8500) and 13 parts of sodium lignin sulfonate were added to the solution in step (1), and the mixture was stirred on a magnetic stirrer at 450 r / min for 3 min at room temperature until the alkaline lignin and sodium lignin sulfonate were completely dissolved.

[0139] (3) Slowly add 30 parts of sodium alginate to the solution in step (2), heat in a water bath at 50°C and stir at a rate of 650 r / min for 30 min until the sodium alginate is completely dissolved to obtain a second mixed solution.

[0140] 3. Preparation of an anti-ultraviolet agricultural biomass liquid spray agent: Mix the first mixed liquid and the second mixed liquid, add 750 parts of water to dilute it, and then add 10 parts of biomass charcoal powder (specifically straw biomass charcoal powder, purchased from Sinopharm Group, product number CZ0000), and stir to obtain a multifunctional anti-ultraviolet agricultural biomass liquid spray agent.

[0141] The performance of the films in Example 1, Example 2 and Example 3 will be tested using the liquid casting method. The specific testing steps are as follows:

[0142] 1. Water solubility test

[0143] The water solubility of the films was evaluated gravimetrically. Approximately 1 g of each sample was dried in an oven at 100°C for 24 h. Subsequently, the initial mass (W0) was recorded and the samples were placed in 50 mL of distilled water at room temperature for 10 h. After this immersion period, solid-liquid separation was performed and the remaining film was heated at 55 ◦ The mixture was further dried in an oven at 400 °C for 24 h. The final weight (W1) was recorded and the solubility percentage was calculated according to Formula 1.

[0144] Formula 1

[0145] Where W0 and W1 represent the initial and final weights of the covering, respectively (g).

[0146] The solubility percentages of the liquid spray agents prepared in Example 1, Example 2, and Example 3 are 73%, 52%, and 69%, respectively.

[0147] 2. Light transmittance test

[0148] The transmittance of the film was measured using an ultraviolet spectrophotometer. The film was cut into 4 cm × 1 cm rectangular pieces for measurement. The transmittance was calculated in the photosynthetically active radiation spectrum (600 nm).

[0149] The light transmittances of the liquid spray agents prepared in Example 1, Example 2, and Example 3 are 6%, 2%, and 3, respectively.

[0150] 3. Contact angle test

[0151] The contact angle between the film formed by the spraying agent and water was measured by the fixed drop method of the contact angle analyzer, with the water drop dosage of 3 μL each time.

[0152] The contact angles of the liquid spray agents prepared in Example 1, Example 2 and Example 3 were 15 。 , 80 。 , 54 。 .

[0153] 4. Thermal insulation test

[0154] Soil temperature data at a depth of 5 cm in the soil layer were collected for the untreated soil (CK) and the spraying agents of Example 1, Example 2, and Example 3, and the soil temperature was recorded at 15:00 in the afternoon.

[0155] The soil temperatures of the untreated soil (CK) and the soil treated with the liquid spray agents prepared in Example 1, Example 2, and Example 3 were 37° C., 39° C., 43° C., and 41° C., respectively.

[0156] 5. Water retention test

[0157] The dried soil samples were weighed and placed in glass culture dishes with a diameter of 90 mm. The soil moisture content was replenished to about 40%, and then each culture dish was covered and sealed with sealing film. All samples were stored for 12 hours to saturate the samples with water. Then, the soil was saturated with water at 0.6 kg / m 2 When the sample films on the soil surface were dry, they were transferred to a ◦ C drying oven for 12 hours, and the water retention rate (%) is calculated using Formula 2.

[0158] Water retention rate = Formula 2

[0159] Where m2 represents the mass of the sample after water evaporation (g);

[0160] m1 is the mass of the sample before water evaporation (g);

[0161] m0 is the mass of the spray agent after drying (g).

[0162] The 12-h soil water retention rates of the untreated soil (CK) and the soil treated with the liquid spray agents prepared in Example 1, Example 2, and Example 3 were 2%, 27%, 46%, and 39%, respectively.

[0163] 6. Method for testing the UV resistance of colonies after mixing UV-resistant agricultural biomass liquid spray agent with Bacillus thuringiensis inoculant:

[0164] Treatment group: According to the per-acre dosage of Bacillus thuringiensis agent (500 g to 500 kg of water), 100 parts of the UV-resistant agricultural biomass liquid spray agent in Example 2 were taken, 0.1 parts of Bacillus thuringiensis agent was added, and the mixture was shaken at 180 rpm and 30°C for 2 h.

[0165] Control group (CK): According to the dosage of Bacillus thuringiensis inoculant per mu (500 g to 500 kg of water), 0.1 parts of Bacillus thuringiensis inoculant were added to 100 parts of sterile water to prepare a bacterial suspension, and the suspension was shaken at 180 rpm and 30°C for 2 h.

[0166] 1) Bacteria liquid spray plate:

[0167] After 2 hours, the control group and the treatment group were taken out, and 50 μl of bacterial solution was sprayed on the plates (shaken in advance). Three plates were sprayed on each of the control group and the treatment group, and marked as CK1, CK2, CK3, CL1, CL2, and CL3 respectively;

[0168] 2) UV treatment:

[0169] CK1 and CL1 were irradiated under UV for 0 min; CK2 and CL2 were irradiated under UV for 30 min; CK3 and CL3 were irradiated under UV for 60 min. Then, the tubes were sealed, taken out and placed upside down in a bacterial incubator, and the colony morphology was observed regularly.

[0170] After the spray film prepared above was mixed with the Bacillus thuringiensis agent and irradiated with ultraviolet light, the colony count of the Bacillus thuringiensis agent was as shown in Table 1.

[0171] Table 1

[0172]

[0173] in, Figure 1 This is a physical picture of the biomass-based multifunctional degradable spray agent prepared in Example 2. Figure 2This is the effect picture of the liquid spray film prepared in Example 2 being sprayed on the soil surface indoors. Figure 3 This is the effect picture of the liquid spray film prepared in Example 2 being sprayed on the soil surface outdoors. Figure 4 The figure shows the percentage of dissolution of the spray film prepared in Example 1, Example 2 and Example 3 in water. Figure 5 The light transmittance results of the spray film prepared in Example 1, Example 2, and Example 3 are shown in FIG. Figure 6 The contact angle results of the film layers formed by the spraying agents prepared in Example 1, Example 2, and Example 3 with water are shown; Figure 7 The effects of the spray film prepared in Example 1, Example 2, and Example 3 on the ground temperature after covering the soil surface. Figure 8 The water retention results of the spray film prepared in Example 1, Example 2, and Example 3 after 12 hours of film formation are shown in the figure. Figure 9 This is a colony morphology of the Bacillus thuringiensis agent after the spray film prepared in Example 2 was mixed with the Bacillus thuringiensis agent and irradiated with ultraviolet light. Figure 10 This is a physical picture of the biomass-based multifunctional degradable liquid spray agent prepared in Comparative Example 1. The anti-UV agricultural biomass liquid spray agent prepared in Comparative Example 1 is easy to clog the nozzle due to the addition of excessive biochar, and has a high viscosity, which is not conducive to spraying and forming.

[0174] In summary, the above-mentioned anti-UV agricultural biomass liquid spray agent has the following specific effects: 1. The performance of the film-forming product is stable: the obtained spray agent uses citric acid as a cross-linking agent and polyvinyl alcohol as a film-coating agent, which significantly improves its mechanical properties and is superior to a single biomass-based spray agent. In addition, alkaline lignin and fulvic acid are rich in phenolic hydroxyl groups, alcoholic hydroxyl groups and methoxy groups. These functional groups effectively enhance the film's resistance to UV aging, thereby maintaining its structural integrity from damage; 2. Promote soil warming: The spray agent sprayed on the surface combines with the soil colloid particles, and after air drying and curing, forms a dense film, which effectively reduces heat loss. At the same time, biochar has good photothermal conversion efficiency and can convert light energy into heat energy, thereby further increasing soil temperature. 3. Enhance soil fertility and promote crop growth: The obtained spray agent contains fulvic acid and biochar, both of which are effective soil conditioners. Fulvic acid is a natural organic acid humus that has the function of enhancing soil fertility; biochar also helps to improve soil structure and enhance the soil's ability to retain water and fertilizer, thereby promoting crop growth. 4. Environmentally friendly, can be mixed with biocontrol bacteria and agents, and the materials are biodegradable: The liquid spray agent is made of environmentally friendly raw materials. Its main components, such as film-forming materials and lignin sulfonates, are all natural polysaccharide polymers. They can not only provide a suitable colonization environment for biocontrol bacteria, but also effectively alleviate the damage caused by ultraviolet rays when used in combination with biocontrol bacteria, thereby improving the biological control effect. At the same time, the components of the spray agent have good degradability and can be decomposed by soil microorganisms, significantly reducing the potential harm to the ecological environment. 5. Low cost and simple preparation process: The selected raw materials are widely available and inexpensive, the preparation process is simple, and does not require complex reaction conditions, which facilitates large-scale batch production.

[0175] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0176] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. An anti-ultraviolet agricultural biomass liquid spray agent, characterized in that: The composition includes the following components by weight: 10 to 30 parts of film-forming agent, 1 to 15 parts of humic acid, 1 to 15 parts of cross-linking agent, 1 to 10 parts of biomass-based film-forming material, 1 to 15 parts of pH regulator, 1 to 10 parts of plasticizer, 5 to 20 parts of lignin sulfonate, 0.1 to 5 parts of biochar and 75 to 900 parts of solvent.

2. The UV-resistant agricultural biomass liquid spray agent according to claim 1, characterized in that: The invention comprises the following components: 10 to 30 parts of a film-forming agent, 10 to 15 parts of humic acid, 10 to 15 parts of a cross-linking agent, 1 to 10 parts of a biomass-based film-forming material, 10 to 15 parts of a pH regulator, 1 to 10 parts of a plasticizer, 5 to 20 parts of lignin sulfonate, 0.1 to 3 parts of biochar and 90 to 850 parts of a solvent.

3. The UV-resistant agricultural biomass liquid spray agent according to any one of claims 1 to 2, characterized in that: The film-aiding agent includes one or more of polyvinyl alcohol, polyvinyl pyrrolidone and hydroxypropyl methylcellulose; and / or, the humic acid comprises fulvic acid; And / or, the cross-linking agent includes one or more of citric acid, polyacrylic acid and succinic acid.

4. The UV-resistant agricultural biomass liquid spray agent according to any one of claims 1 to 2, characterized in that: The lignin sulfonate includes one or more of sodium lignin sulfonate and calcium lignin sulfonate; and / or, the pH adjuster comprises alkaline lignin; and / or, the biomass-based film-forming material comprises one or more of sodium carboxymethyl cellulose, oxidized starch, xanthan gum, guar gum, sodium alginate, pulp waste liquid, tobacco waste liquid and gelatin aqueous solution; and / or, the plasticizer comprises glycerol; And / or, the biochar is derived from one or more of straw, egg shells, fallen leaves, orange peels, peanut shells, cotton shells and walnut shells; And / or, the solvent comprises water.

5. A method for preparing an anti-ultraviolet agricultural biomass liquid spray agent, characterized in that: The steps include: The components of the UV-resistant agricultural biomass liquid spray agent according to any one of claims 1 to 4 are mixed and prepared.

6. The method for preparing the UV-resistant agricultural biomass liquid spraying agent according to claim 5, wherein: Mixing includes the following steps: Mixing the film-forming agent, the cross-linking agent, the humic acid and a portion of the solvent to prepare a first mixed solution; Mixing the biomass-based film-forming material, the pH adjuster, the lignin sulfonate, the plasticizer, and another portion of the solvent to prepare a second mixed solution; and The first mixed liquid, the second mixed liquid, the remaining portion of the solvent and the biochar are mixed to prepare the anti-ultraviolet agricultural biomass liquid spray agent.

7. Use of the UV-resistant agricultural biomass liquid spray agent according to any one of claims 1 to 4 in crop planting.

8. The use according to claim 7, characterized in that The application amount of the anti-ultraviolet agricultural biomass liquid spray agent is 350 kg / mu to 450 kg / mu.

9. The use according to claim 8, characterized in that include: The anti-ultraviolet agricultural biomass liquid spray agent is mixed with a biocontrol fungicide.

10. The use according to claim 9, characterized in that The mass ratio of the anti-ultraviolet agricultural biomass liquid spray agent to the biocontrol fungus agent is 100: (0.05-0.15).

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