Application-reducing synergistic agricultural input magnetic polysaccharide synergist and application thereof

Abstract

The invention discloses an application-reducing synergistic agricultural input magnetic polysaccharide synergist and application thereof. The magnetic polysaccharide synergist comprises 85-100 parts of a natural polysaccharide solution with the volume concentration of 0.5%-3%, 1-4 parts of a water-retaining agent, 0.6-2 parts of a pore filling agent and 0.2-0.6 part of magnetic nanoparticles. The magnetic polysaccharide synergist at least has the advantages of being good in sustained and controlled release effect, capable of retaining water and increasing fertility, capable of reducing fertilizer nutrient loss, biodegradable, capable of promoting crop growth, capable of being magnetically recycled and reused and the like.

Description

Technical Field

[0001] This application relates to the technical field of agricultural inputs, and specifically relates to a magnetic polysaccharide synergist for reducing application and increasing efficiency of agricultural inputs and its uses. Background Art

[0002] Agricultural inputs, including chemical fertilizers and pesticides, play a crucial role in agricultural production. They can not only quickly supplement the nutrients required by crops, promote crop growth, and increase yields, but also play a key role in crop protection, effectively controlling pests and diseases, and ensuring the stability of agricultural production. However, some obvious defects have also emerged in the use of traditional agricultural inputs. For chemical fertilizers, the traditional application methods often lead to too rapid nutrient release, making it difficult for crops to fully absorb, resulting in low nutrient utilization efficiency and thus causing waste of resources. In addition, when chemical fertilizers are directly applied to the soil, there is often a high nutrient loss and a series of problems such as soil acidification and compaction may be triggered. This not only affects the health status of the soil, but may also damage the growth environment of crops, and thus affect the quality and yield of agricultural products. In terms of pesticides, although pesticides can effectively control crop pests and diseases, their improper use will also bring some negative impacts. For example, the abuse or overuse of pesticides may lead to pesticide residue problems, affecting the environment and human health. In addition, the long-term application of chemical pesticides may also lead to the generation of crop resistance, thus affecting the control effect of pests and diseases. Therefore, improving the utilization efficiency of chemical fertilizer nutrients and reducing their loss rate, while achieving precise control and environmental protection in pesticide use, have become the urgent needs for the development of current agricultural inputs. This can not only reduce resource waste, but also effectively reduce the negative impacts on the environment and soil, thus realizing the sustainable development of agriculture.

[0003] Synergists are widely used in the processing of pesticides and fertilizers because of their advantage of effectively improving the bioavailability of agricultural inputs. Pesticide synergists can improve biological control efficiency and reduce the occurrence of pesticide damage after being mixed with pesticides; Chinese invention patent application CN200510020600.5 records a Rhizoma Coptidis pesticide synergist, which can effectively improve the antibacterial activity of pesticides, but its preparation process is complicated and the yield is low; in addition, traditional pesticide synergists on the market, such as synergistic ether, synergistic phosphorus, and synergistic sulfone, have shortcomings such as long synthesis routes, high prices, and environmental pollution. Fertilizer synergism is currently focused on a new type of compound fertilizer based on the endoplasmic molecular network - synergistic loss control fertilizer. Synergistic loss control fertilizer refers to the fertilizer nutrient loss control agent produced by adding the fertilizer nutrient loss control agent to control the loss of major nutrients during the fertilizer production process, which can improve the nutrient utilization rate of compound fertilizers and reduce losses such as volatilization, runoff and leaching after fertilizer application. Among them, the fertilizer nutrient loss control agent is a compound of organic and inorganic compounds, which can control the nutrient loss of compound fertilizers through its unique physical and chemical properties. Chinese invention patent application CN113214003A records a biological loss control fertilizer with added multi-enzyme bacteria. This invention can extend the action time of the fertilizer, but the raw material multi-enzyme bacteria used is easy to inactivate, the cost is high, it is not conducive to long-term storage and does not have water retention performance; Chinese invention patent application CN111233560A records a fertilizer loss control agent and its preparation method, and a concentrated energy loss control fertilizer and its preparation method. This invention has a good slow-release effect, but 10% concentrated sulfuric acid is used in its raw materials, which has a greater impact on the environment.

[0004] Therefore, developing an agricultural input enhancer that is efficient, environmentally friendly, low-cost, and has the function of reducing application and increasing efficiency has become a research focus for those skilled in the art. Summary of the invention

[0005] Based on this, it is necessary to address some technical difficulties currently faced in the use of agricultural inputs, especially how to improve the utilization efficiency of pesticides and fertilizers and reduce environmental pollution, and achieve the technical problem of reducing the amount and increasing the efficiency, and at least provide a magnetic polysaccharide enhancer and its use for reducing the amount of agricultural inputs and increasing the efficiency.

[0006] In the first aspect of the present application, a magnetic polysaccharide synergist is provided, comprising:

[0007] 85 to 100 parts of a natural polysaccharide solution with a volume concentration of 0.5% to 3%, 1 to 4 parts of a water retaining agent, 0.6 to 2 parts of a pore filling agent, and 0.2 to 0.6 parts of magnetic nanoparticles;

[0008] The natural polysaccharide comprises one or more of seaweed polysaccharide, chitosan and chitosan oligosaccharide.

[0009] In some embodiments, the water retaining agent includes one or more of chitosan, polyacrylamide, sodium polyacrylate and sodium carboxymethyl cellulose.

[0010] In some embodiments, the hole filling agent comprises one or more of rice husk charcoal, bentonite, attapulgite, kaolin, talcum powder, and gypsum powder.

[0011] In some embodiments, the hole filling agent comprises rice husk charcoal.

[0012] In some embodiments, the fineness of the rice husk charcoal is 40 mesh to 60 mesh.

[0013] In some embodiments, the magnetic nanoparticles comprise one or more of Fe3O4, FeNi(Mo), FeSi, FeAl, and BaO·6Fe2O3.

[0014] In a second aspect of the present application, there is provided a composition comprising the magnetic polysaccharide synergist as described in the first aspect.

[0015] In some embodiments, the composition further comprises 10 parts to 100 parts of agricultural inputs.

[0016] In some embodiments, the agricultural inputs comprise one or more of pesticide technicals and fertilizers.

[0017] In some embodiments, the pesticide technicals comprise one or more of insecticides and fungicides.

[0018] In some embodiments, the fertilizer comprises inorganic fertilizers. In some embodiments, the inorganic fertilizers comprise one or more of urea, ammonium sulfate, monoammonium phosphate, diammonium phosphate, potassium chloride, and potassium dihydrogen phosphate.

[0019] In some embodiments, the insecticides comprise one or more of emamectin benzoate and imidacloprid.

[0020] In some embodiments, the fungicides comprise one or more of tebuconazole, boscalid, and iprodione.

[0021] In a third aspect of the present application, there is provided a compound fertilizer prepared using the composition as described in the second aspect.

[0022] In some embodiments, the method for preparing the compound fertilizer comprises the following steps:

[0023] Mix 85 parts to 100 parts of a seaweed polysaccharide solution with a volume concentration of 0.5% to 3%, 1 part to 4 parts of a water retaining agent, 0.6 part to 2 parts of a hole filling agent, 0.2 part to 0.6 part of magnetic nanoparticles, and 10 parts to 100 parts of agricultural inputs;

[0024] Stir and dry to prepare the compound fertilizer.

[0025] In some embodiments, the stirring speed is 200 rpm to 600 rpm.

[0026] In some embodiments, the drying temperature is 30°C to 60°C.

[0027] The advantages of the magnetic poly saccharide synergist for reducing application and increasing efficiency agricultural inputs provided by this application at least include:

[0028] Good sustained and controlled release effect: For example, in some embodiments, the ternary composite gel network of alginate / magnetic nanoparticles / chitosan constructed adjusts the porosity of the gel network through the cross-linking of alginate with magnetic particles and metal ions in the soil under natural conditions, achieving the effect of long-term slow release, reducing the usage amounts of pesticides and fertilizers, and meeting the growth needs of crops;

[0029] Water retention and fertilizer enhancement: The water retention agent taking chitosan as an example has good water retention performance and can greatly improve the utilization efficiency of water and fertilizer in arid and less rainy areas; meanwhile, pore fillers such as rice husk charcoal and the water retention agent taking chitosan as an example are good soil conditioners and can increase soil fertility;

[0030] Reducing the loss of fertilizer nutrients: Pore fillers such as rice husk charcoal and the water retention agent taking chitosan as an example can reinforce the ternary composite gel network (such as alginate / magnetic nanoparticles / chitosan), prevent the rapid release of pesticide molecules and fertilizer nutrients, and reduce the loss of pesticides and fertilizer nutrients;

[0031] Biodegradable and promoting crop growth: Natural polysaccharides are natural macromolecular polysaccharide substances, can be completely degraded in the soil, and their products can be fully utilized by crops to promote crop growth;

[0032] Magnetic recovery and reuse: The introduction of magnetic nanoparticles enables magnetic response recovery, which is beneficial to the recovery and reuse of raw materials and reduces production costs.

[0033] In summary, the magnetic poly saccharide synergist for reducing application and increasing efficiency agricultural inputs in this application has multiple advantages: reducing the loss of chemical fertilizers and pesticides, improving the growth environment of crops, and promoting the healthy growth of crops. This technology not only improves the utilization efficiency of fertilizers and pesticides, realizes the reduction of application amount and increase of efficiency of agricultural inputs, but also can effectively reduce environmental pollution, and is an agricultural green technology with broad application prospects. Description of the Drawings

[0034] To more clearly illustrate the technical solutions in the embodiments and examples of the present application and to more comprehensively understand the present application and its beneficial effects, the following will briefly introduce the drawings required for the description of the embodiments or examples. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings. It should also be noted that the drawings are all drawn in a simplified form and are only used to conveniently and clearly assist in the explanation of the present application.

[0035] Figure 1 It is the swelling rate diagram of the magnetic poly saccharide synergist of the agricultural input with reduced application and increased efficiency in an embodiment of the present application.

[0036] Figures 2A to 2C It is the magnetic response effect diagram and recovery rate diagram of the magnetic poly saccharide synergist of the agricultural input with reduced application and increased efficiency in an embodiment of the present application; among them Figure 2A shows the effect diagram, Figure 2B shows the recovery rate in soil, Figure 2C shows the recovery rate in water.

[0037] Figure 3A and Figure 3B shows the response release rate and biological control effect diagram of the insecticide containing the magnetic poly saccharide synergist of the agricultural input with reduced application and increased efficiency in an embodiment of the present application; among them Figure 3A shows the precise drug release behavior of the insecticide containing the magnetic poly saccharide synergist, Figure 3B shows the influence of the insecticide containing the magnetic poly saccharide synergist on biological activity.

[0038] Figures 4A to 4D shows the application effect index diagram of the compound fertilizer containing the magnetic poly saccharide synergist of the agricultural input with reduced application and increased efficiency in an embodiment of the present application; among them Figure 4A shows the influence on plant height, Figure 4B shows the influence on tiller number, Figure 4C shows the influence on main stem thickness, Figure 4D shows the influence on leaf width. Detailed implementation manners

[0039] To facilitate the understanding of the present application, the following will describe the present application more comprehensively with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure content of the present application more thorough and comprehensive.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the description of this application herein 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 related listed items.

[0041] In this application, unless otherwise stated, "one or more" means any one of the listed items or any combination of the listed items. Similarly, in other cases where "one or more" and other expressions indicating "one or more" are used, they shall be understood in the same way unless otherwise stated.

[0042] As used in this application, "its combination", "any combination thereof", "any combination mode thereof", etc. include all suitable combination modes of any two or more of the listed items.

[0043] In this application, in "suitable combination mode", "suitable mode", "any suitable mode", etc., "suitable" is subject to being able to implement the technical solution of this application, solve the technical problems of this application, and achieve the expected technical effects of this application.

[0044] In this application, terms such as "further", "even further", "specially", "for example", "such as", "example", "exemplification", etc. are used for descriptive purposes, indicating that there is an association in the covered content between the different technical solutions before and after, but should not be understood as a limitation on the previous technical solution, nor can it be understood as a limitation on the protection scope of this application. In this application, unless otherwise stated, A (such as B) means that B is a non-limiting example in A, and it can be understood that A is not limited to B.

[0045] In this application, "optionally", "optional", "option", mean that it can be there or not, that is, it refers to any one of the two parallel options of "yes" or "no". If "optional" appears multiple times in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction relationship, each "optional" is independent. Unless otherwise stated, descriptions such as "optionally include" and "optionally contain" in this application, taking "optionally include" as an example, mean "may include or may not include".

[0046] The terms "contain", "include" and "comprise" used in this application are synonyms, which are inclusive or open-ended and do not exclude additional, unmentioned members or features. Members or features include, for example, materials or components, structures, elements, instruments, etc.; non-limiting examples of members or features also include actions, conditions for actions to occur, timing, states, etc.

[0047] In this application, for the technical features or technical solutions described in an open language, it includes both the closed technical features or technical solutions composed of the listed content and the open technical features or technical solutions including the listed content.

[0048] In this application, the exemplary descriptions such as "in some embodiments" or "in one embodiment" can cover but are not limited to the following meanings: These solutions can be combined with other solutions in a suitable manner to form new technical solutions.

[0049] In this application, in "the first aspect", "the second aspect", "the third aspect", "the fourth aspect", etc., the terms "first", "second", "third", "fourth", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly specifying the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0050] In this application, regarding the numerical interval (i.e., the numerical range), unless otherwise specifically stated, the distribution of the selectable numerical values within this numerical interval is considered continuous and includes the two numerical endpoints of this numerical interval (i.e., the minimum value and the maximum value), as well as each numerical value between these two numerical endpoints. Unless otherwise specifically stated, when the numerical interval only refers to the integers within this numerical interval, it includes the two endpoint integers of this numerical range, as well as each integer between the two endpoints, which is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all sub-ranges subsumed therein. The "numerical value" in this numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. The "numerical interval" allows for a broad inclusion of numerical interval types such as a percentage interval, a ratio interval, a ratio range, etc.

[0051] In this application, for a method process involving multiple steps, unless there are clear different descriptions in this article, the execution of these steps has no strict order limit, and it can be executed in an order other than the described one. Moreover, any one step can include multiple sub-steps or multiple stages. These sub-steps or stages do not necessarily need to be executed at the same moment, but can be executed at different moments, and their execution order does not necessarily need to be sequential, but can be executed alternately or simultaneously with other steps or a part of the sub-steps or stages of other steps.

[0052] The present application provides a magnetic polysaccharide synergist (also referred to as a "synergist") with multiple functions such as environmental responsiveness, water retention and loss control, and bacteria-promoting soil cultivation. The synergist achieves intelligent and precise nutrient supply and drug efficacy persistence by adjusting the release behavior of pesticides and fertilizers. Specifically, the environmental responsiveness of the synergist can intelligently regulate the release of active ingredients of pesticides and fertilizers according to soil and climatic conditions to achieve precise application, thereby effectively reducing the leaching loss of nutrients and pesticides, significantly improving the utilization rate of agricultural inputs, and promoting the healthy growth of crops. Its loss control performance can slow down the excessive release of pesticides and fertilizers, avoid the ineffective loss of agents and nutrients, extend their effective action time in the soil, and ensure that crops continue to obtain stable nutrient supply and protection throughout the growth period. The synergist has significant water retention performance, can effectively lock the moisture in the soil, and improve the soil's water retention capacity, especially in arid areas or environments with rapid water loss, can effectively improve the soil's water holding capacity, and ensure that crops can also obtain sufficient water supply under drought conditions.

[0053] In the first aspect of the present application, a magnetic polysaccharide synergist is provided, comprising:

[0054] 85 to 100 parts of a natural polysaccharide solution with a volume concentration of 0.5% to 3%, 1 to 4 parts of a water retaining agent, 0.6 to 2 parts of a pore filling agent, and 0.2 to 0.6 parts of magnetic nanoparticles;

[0055] The natural polysaccharides include one or more of seaweed polysaccharides, chitosan and chitosan oligosaccharides.

[0056] In some embodiments, the weight proportions of the natural polysaccharide solution are 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, or a range or value between any two values.

[0057] In some embodiments, the volume concentration of the natural polysaccharide solution is 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2.0%, 2.1%, 2.2%, 2.3%, 2.4%, 2.5%, 2.6%, 2.7%, 2.8%, 2.9%, 3.0%, or a range or value between any two values.

[0058] In some embodiments, the weight parts of the water retention agent are 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, 1.9 parts, 2.0 parts, 2.2 parts, 2.4 parts, 2.6 parts, 2.8 parts, 3.0 parts, 3.2 parts, 3.4 parts, 3.6 parts, 3.8 parts, 4.0 parts, or a range or value between any two values.

[0059] In some embodiments, the weight parts of the hole filling agent are 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1.0 part, 1.1 part, 1.2 part, 1.3 part, 1.4 part, 1.5 part, 1.6 part, 1.7 part, 1.8 part, 1.9 part, 2 parts, or a range or value between any two values.

[0060] In some embodiments, the weight parts of the magnetic nanoparticles are 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, or a range or value between any two values.

[0061] Without wishing to be bound by any theory, it is believed that the role played by the natural polysaccharide is at least to precisely release drug molecules and nutrients through metal coordination and hydrogen bond double crosslinking to form a nano-network structure, and to block its loss. It can also promote the proliferation of beneficial microorganisms (such as nitrogen-fixing bacteria, cellulose-decomposing bacteria, etc.) and inhibit the growth of harmful bacteria, thereby optimizing the soil micro-ecology, enhancing the soil fertility and health, and ultimately improving the soil quality and crop yield.

[0062] In some embodiments, the natural polysaccharide is seaweed polysaccharide. Without wishing to be bound by any theory, it is believed that the carboxyl group (-COOH) of the seaweed polysaccharide can crosslink with magnetic particles and metal ions in the soil to regulate the porosity of the complex, which is beneficial to the sustained and controlled release of agricultural inputs.

[0063] The water retention agent in the present application can be a conventional water retention agent in the art. Exemplary water retention agents are chitin, polyacrylamide, sodium polyacrylate, or sodium carboxymethyl cellulose, etc. In some embodiments, the magnetic poly-polysaccharide synergist includes one or more of the above water retention agents. In some embodiments, the magnetic poly-polysaccharide synergist includes at least two of the above water retention agents. For example, it includes two water retention agents, chitin and polyacrylamide, or includes chitin and sodium polyacrylate, or includes sodium carboxymethyl cellulose and sodium polyacrylate, and sodium carboxymethyl cellulose, as well as any other combination of two or more water retention agents. In some embodiments, the water retention agent in the magnetic poly-polysaccharide synergist at least includes chitin.

[0064] In some embodiments, the water retention agent is chitin.

[0065] In some embodiments, the water retaining agent is chitin, and the natural polysaccharide is algal polysaccharide. The inventors unexpectedly found that through the combination of algal polysaccharide and chitin, a binary hybrid hydrogel network with environmental response performance can be formed. This hydrogel can form a molecular chain entanglement structure through electrostatic interaction, hydrogen bond and hydrophobic interaction. This structure not only helps the efficient loading of pesticide components or fertilizer molecules, but also can improve their distribution uniformity in the soil through physical embedding and complexation. Especially the water retaining property of algal polysaccharide helps the uniform diffusion and slow release of pesticide components or fertilizer molecules in the soil. Magnetic nanoparticles, as a bridging polymerizer, further optimize the performance of the hydrogel. It can chemically crosslink with the carboxyl and hydroxyl groups in polysaccharide alginate, and at the same time, alginate can also crosslink with divalent or trivalent metal ions (such as calcium and magnesium ions) in the soil to further finely regulate the porosity of the gel network, constructing a ternary composite nano-network system of polysaccharide alginate / magnetic nanoparticles / chitin, which can efficiently coat pesticide molecules and fertilizer molecules, so as to achieve the long-term slow release of fertilizer and pesticide molecules in the soil, reduce the leaching loss of fertilizer and pesticide, meet the growth of crops, and reduce the risk of environmental pollution. Magnetic nanoparticles can not only effectively catalyze the scavenging of free radicals, enhance the vitality and stress resistance of crop roots, but also promote the healthy growth of crops. This ternary composite network not only has the ability to control the release of pesticides and fertilizers, but also can respond to the change of soil moisture, intelligently adjust the release of pesticides and fertilizers, and ensure that crops can continuously obtain the required nutrients and drug effects throughout the growth period.

[0066] In some embodiments, the pore filler includes one or more of rice husk charcoal, bentonite, attapulgite, kaolin, talc powder and gypsum powder. In some embodiments, the pore filler at least includes rice husk charcoal. Without wishing to be bound by any theory, it is believed that rice husk charcoal can effectively reduce the pore size of the nutrient or pesticide molecule release channel, slow down the excessive release of nutrients or pesticides, and reduce the loss of fertilizer and pesticide. At the same time, these biomass-based materials have good environmental protection, can improve the physical and chemical properties of the soil, increase soil fertility, and have the advantages of low cost and wide resources.

[0067] In some embodiments, the pore filler includes rice husk charcoal. The fineness of the rice husk charcoal can be 40 mesh to 60 mesh. In some embodiments, the fineness of the rice husk charcoal is 40 mesh, 41 mesh, 42 mesh, 43 mesh, 44 mesh, 45 mesh, 46 mesh, 47 mesh, 48 mesh, 49 mesh, 50 mesh, 51 mesh, 52 mesh, 53 mesh, 54 mesh, 55 mesh, 56 mesh, 57 mesh, 58 mesh, 59 mesh, 60 mesh, or the range or value between any two values. In some embodiments, the fineness of the rice husk charcoal is non-uniform and distributed between 40 mesh and 60 mesh.

[0068] In some embodiments, the magnetic nanoparticles include one or more of Fe3O4, FeNi(Mo), FeSi, FeAl, and BaO·6Fe2O3.

[0069] In a second aspect of the present application, there is provided a composition comprising the magnetic polysaccharide synergist as described in the first aspect.

[0070] In some embodiments, the composition further comprises 10 parts to 100 parts of agricultural inputs. The agricultural inputs can be, for example, technical pesticides, fertilizers, etc.

[0071] In some embodiments, the technical pesticides include one or more of insecticides and fungicides. In some embodiments, the insecticides include one or more of emamectin benzoate and imidacloprid. In some embodiments, the fungicides include one or more of tebuconazole, boscalid, and iprodione.

[0072] In some embodiments, the fertilizers include inorganic fertilizers. In some embodiments, the inorganic fertilizers include one or more of urea, ammonium sulfate, monoammonium phosphate, diammonium phosphate, potassium chloride, and potassium dihydrogen phosphate.

[0073] In a third aspect of the present application, there is provided a compound fertilizer prepared using the composition as described in the second aspect.

[0074] In some embodiments, the method for preparing the compound fertilizer comprises the following steps:

[0075] Mix 85 parts to 100 parts of a seaweed polysaccharide solution with a volume concentration of 0.5% to 3%, 1 part to 4 parts of a water-retaining agent, 0.6 parts to 2 parts of a pore-filling agent, 0.2 parts to 0.6 parts of magnetic nanoparticles, and 10 parts to 100 parts of agricultural inputs;

[0076] Stir and dry to prepare the compound fertilizer.

[0077] In some embodiments, the rotation speed for stirring is 200 rpm (r / min) to 600 rpm. Exemplarily, the rotation speed is 200 rpm, 250 rpm, 300 rpm, 350 rpm, 400 rpm, 450 rpm, 500 rpm, 550 rpm, 600 rpm, or a range or value between any two values.

[0078] In some embodiments, the drying temperature is 30°C to 60°C. Exemplarily, the drying temperature is 30°C, 31°C, 32°C, 33°C, 34°C, 35°C, 36°C, 37°C, 38°C, 39°C, 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, or the range or value between any two numerical values.

[0079] Some examples are provided below.

[0080] The embodiments of the present application will be described in detail below in conjunction with the examples. It should be understood that these examples are only used to illustrate the present application and not to limit the scope of the present application. For the experimental methods without specified conditions in the following examples, the guidance given in the present application is preferably referred to, and it can also be carried out according to the experimental manuals or conventional conditions in the art, according to the conditions recommended by the manufacturer, or referring to the experimental methods known in the art.

[0081] Unless otherwise specified, the reagents, methods, and equipment used in the present application are conventional reagents, methods, and equipment in the art. Unless otherwise specified, the "parts" mentioned below all refer to parts by weight.

[0082] Tables 1 to 5 below respectively show the formulations of the magnetic polysaccharide synergist for reducing application and increasing efficiency and Examples 1 to 2, Comparative Examples 1 to 2 for preparing pesticides or compound fertilizers containing the magnetic polysaccharide synergist for reducing application and increasing efficiency.

[0083] Table 1 Formulation table of the magnetic polysaccharide synergist for reducing application and increasing efficiency

[0084]

[0085] Table 2 Formulation table of the pesticide containing the magnetic polysaccharide synergist for reducing application and increasing efficiency in Example 1

[0086]

[0087] Table 3 Formulation table of the compound fertilizer containing the magnetic polysaccharide synergist for reducing application and increasing efficiency in Example 2

[0088]

[0089] Table 4 Formulation table of the compound fertilizer containing the magnetic polysaccharide synergist for reducing application and increasing efficiency in Comparative Example 1

[0090]

[0091] Table 5 Formulation table of the compound fertilizer containing the magnetic polysaccharide synergist for reducing application and increasing efficiency in Comparative Example 2

[0092]

[0093] The preparation method of the magnetic polysaccharide synergist for reducing application amount and increasing efficiency includes the following steps:

[0094] (1) Prepare 100 parts of 1.9% aqueous solution of seaweed polysaccharide for later use;

[0095] (2) Add 1.8 parts of 60-mesh rice husk charcoal, 3.8 parts of chitin, and 0.4 part of iron tetroxide nanoparticles into the aqueous solution of seaweed polysaccharide prepared in step (1) respectively. After stirring evenly at a speed of 200 r / min, spray drying is carried out at 45 °C to obtain the magnetic polysaccharide synergist for reducing application amount and increasing efficiency.

[0096] Example 1

[0097] The preparation method of the insecticide containing the magnetic polysaccharide synergist for reducing application amount and increasing efficiency includes the following steps:

[0098] (1) Prepare 100 parts of 1.9% aqueous solution of seaweed polysaccharide for later use;

[0099] (2) Add 12 parts of emamectin benzoate, 1.8 parts of rice husk charcoal, 3.8 parts of chitin, and 0.4 part of iron tetroxide nanoparticles into the aqueous solution of seaweed polysaccharide prepared in step (1) respectively. After stirring evenly at a speed of 200 r / min, spray drying is carried out at 45 °C to obtain the insecticide containing the magnetic polysaccharide synergist for reducing application amount and increasing efficiency.

[0100] Example 2

[0101] The preparation method of the compound fertilizer containing the magnetic polysaccharide synergist for reducing application amount and increasing efficiency includes the following steps:

[0102] (1) Prepare 100 parts of 1.9% aqueous solution of seaweed polysaccharide for later use;

[0103] (2) Add 30 parts of urea, 26 parts of ammonium sulfate, 26.3 parts of monoammonium phosphate, 3.7 parts of potassium chloride, 6.1 parts of potassium dihydrogen phosphate, 1.8 parts of rice husk charcoal, 3.8 parts of chitin, and 0.4 part of iron tetroxide nanoparticles into the aqueous solution of seaweed polysaccharide prepared in step (1) respectively. After stirring evenly at a speed of 200 r / min, spray drying is carried out at 45 °C to obtain the compound fertilizer containing the magnetic polysaccharide synergist for reducing application amount and increasing efficiency.

[0104] Comparative Example 1

[0105] The preparation method of the compound fertilizer containing the magnetic polysaccharide synergist for reducing application amount and increasing efficiency includes the following steps:

[0106] (1) Prepare 100 parts of 0.1% aqueous solution of seaweed polysaccharide for later use;

[0107] (2) Add 30 parts of urea, 26 parts of ammonium sulfate, 26.3 parts of monoammonium phosphate, 3.7 parts of potassium chloride, 6.1 parts of potassium dihydrogen phosphate, 0.9 part of rice husk charcoal, 1.9 parts of chitin, and 0.4 part of iron oxide nanoparticles into the solution prepared in step (1). After stirring evenly at a speed of 300 r / min, perform spray drying at 30 °C to obtain a compound fertilizer containing a reducing-application and efficiency-increasing magnetic polysaccharide synergist.

[0108] Comparative Example 2

[0109] The preparation method of the compound fertilizer containing a reducing-application and efficiency-increasing magnetic polysaccharide synergist comprises the following steps:

[0110] (1) Prepare 100 parts of a 0.1% aqueous solution of seaweed polysaccharide for standby;

[0111] (2) Add 30 parts of urea, 26 parts of ammonium sulfate, 26.3 parts of monoammonium phosphate, 3.7 parts of potassium chloride, 6.1 parts of potassium dihydrogen phosphate, 1.8 parts of rice husk charcoal, 3.8 parts of chitin, and 0.1 part of iron oxide nanoparticles into the aqueous solution of seaweed polysaccharide prepared in step (1). After stirring evenly at a speed of 400 r / min, perform spray drying at 60 °C to obtain a compound fertilizer containing a reducing-application and efficiency-increasing magnetic polysaccharide synergist.

[0112] Determine the swelling rate and magnetic response performance of the reducing-application and efficiency-increasing magnetic polysaccharide synergist without adding pesticide technical and fertilizer nutrients; determine the response release rate and biological control efficacy of the insecticide containing the reducing-application and efficiency-increasing magnetic polysaccharide synergist prepared in Example 1; compared with Comparative Examples 1 and 2, the appearance morphology of the compound fertilizer prepared in Example 2 is the best, and detect the application effect of the compound fertilizer containing the reducing-application and efficiency-increasing magnetic polysaccharide synergist prepared in Example 2.

[0113] Swelling rate of the reducing-application and efficiency-increasing magnetic polysaccharide synergist without adding pesticide technical and fertilizer nutrients

[0114] (1) Determination of swelling rate

[0115] Weigh 3 g of the synergist, immerse it in 10 mL of water at room temperature, regularly take out the granule agent at 10 min, 40 min, 100 min, 250 min, 600 min, and 1000 min, use filter paper to absorb the excess water on the surface, weigh and record the weight, and calculate its swelling rate;

[0116] The swelling rate is calculated by the following formula:

[0117] Swelling rate = (G2 - G1) / G1 × 100%,

[0118] where G1 is the mass of the synergist before swelling and G2 is the mass of the synergist after swelling.

[0119] (2)Data analysis

[0120] The test results are as Figure 1 shown. It can be seen that the swelling rate of the synergist reaches 542% after 16 h, indicating that the synergist has good water retention performance.

[0121] Magnetic response performance of the synergist of magnetic poly saccharide for reducing application amount and increasing efficiency without adding pesticide technical and fertilizer nutrients

[0122] (1)Experimental method

[0123] Add 1.5 g of the synergist into a 10 mL glass bottle, and collect it in water and soil respectively using magnets with different magnetic field intensities (0.05 T, 0.1 T, 0.15 T, 0.2 T);

[0124] The collection rate is calculated by the following formula:

[0125] Collection rate = m1 / m0 × 100%,

[0126] where m1 and m0 are the weights of the collected synergist and the total synergist respectively.

[0127] (2)Data analysis

[0128] The test results are as Figures 2A to 2C shown: among them, Figure 2A it shows that the prepared synergist can be easily collected by magnets, and the collection rates in water and soil both reach more than 80% at 0.2 T, having good magnetic response recovery performance.

[0129] Response release rate and biological control efficacy of the insecticide containing the synergist of magnetic poly saccharide for reducing application amount and increasing efficiency in Example 1

[0130] (1)Determination of response release rate

[0131] Investigate the release of emamectin benzoate of the insecticide in Example 1 under the influence of different pH values (5.5, 7). At different time intervals, take out the obtained solution (0.1 mL) from the system, determine the content of emamectin benzoate, and supplement an equal amount of the corresponding solution at the same time.

[0132] (2)Determination of biological control efficacy

[0133] Taking noctuids as the research object, study the insecticidal effect of Example 1. Add corn leaves (1 g) into a petri dish with a diameter of 15 cm, and there are 10 noctuids in the petri dish. Then, add 8 ml of deionized water and 3 g of the insecticide containing the synergist of magnetic poly saccharide for reducing application amount and increasing efficiency into the petri dish.

[0134] (3)Data analysis

[0135] The test results are as Figure 3A and Figure 3B shown. In Example 1, the cumulative release rate of the insecticide containing the reducing-application and efficiency-enhancing magnetic polysaccharide synergist is relatively high under acidic conditions, and the insecticidal effect is good.

[0136] The application effect of the compound fertilizer containing the reducing-application and efficiency-enhancing magnetic polysaccharide synergist in Example 2

[0137] (1) Experimental method

[0138] Select healthy wheat seeds, clean them, and soak them in clean water for about 6 hours. Prepare 20 square flower pots of 10×10 cm, and sow 10 wheat seeds in each flower pot. There are 10 pots in each of the CK group and the treatment group. The CK group is the blank control, and the treatment group applies the compound fertilizer prepared in Example 2, with an application rate of 0.5 g. After three weeks, the physiological indexes of wheat in each group are counted.

[0139] (2) Data analysis

[0140] It can be seen from Figures 4A to 4D that compared with the blank group, the physiological indexes of the group applying the compound fertilizer prepared in Example 2 have all improved after three weeks, indicating that the prepared compound fertilizer has good slow-release performance.

[0141] The technical features of the above-mentioned embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered as the scope described in this specification.

[0142] The above-mentioned embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims, and the description and drawings can be used to explain the content of the claims.

Claims

1. A magnetic polysaccharide synergist, characterized in that, It includes: 85 to 100 parts of a natural polysaccharide solution with a volume concentration of 0.5% to 3%, 1 to 4 parts of a water-retaining agent, 0.6 to 2 parts of a pore-filling agent, and 0.2 to 0.6 parts of magnetic nanoparticles; The natural polysaccharide includes one or more of algal polysaccharides, chitosan, and chitosan oligosaccharides.

2. The magnetic polysaccharide synergist according to claim 1, characterized in that The water-retaining agent includes one or more of chitin, polyacrylamide, sodium polyacrylate, and sodium carboxymethyl cellulose.

3. The magnetic polysaccharide synergist according to claim 1 or 2, characterized in that, The pore-filling agent includes one or more of rice husk charcoal, bentonite, attapulgite, kaolin, talc powder, and gypsum powder; Optionally, the pore-filling agent includes rice husk charcoal; Optionally, the fineness of the rice husk charcoal is 40 mesh to 60 mesh.

4. The magnetic polysaccharide synergist according to any one of claims 1 to 3, wherein The magnetic nanoparticles include one or more of Fe3O4, FeNi(Mo), FeSi, FeAl, and BaO·6Fe2O3.

5. A composition, characterized in that, It contains the magnetic polysaccharide synergist as described in any one of claims 1 to 4.

6. The composition according to claim 5, characterized in that, It further contains 10 to 100 parts of agricultural inputs; Optionally, the agricultural inputs include one or more of pesticide technical materials and fertilizers; The pesticide technical materials optionally include one or more of insecticides and fungicides; The fertilizers optionally include inorganic fertilizers; the inorganic fertilizers optionally include one or more of urea, ammonium sulfate, monoammonium phosphate, diammonium phosphate, potassium chloride, and potassium dihydrogen phosphate.

7. The composition according to claim 6, characterized in that, The insecticides include one or more of emamectin benzoate and imidacloprid; And / or, the fungicides include one or more of tebuconazole, boscalid, and iprodione.

8. A compound fertilizer, characterized in that, It is prepared using the composition as described in any one of claims 5 to 7; Optionally, the preparation method of the compound fertilizer includes the following steps: Mix 85 to 100 parts of an algal polysaccharide solution with a volume concentration of 0.5% to 3%, 1 to 4 parts of a water-retaining agent, 0.6 to 2 parts of a pore-filling agent, 0.2 to 0.6 parts of magnetic nanoparticles, and 10 to 100 parts of agricultural inputs; Stir and dry to prepare the compound fertilizer.

9. The compound fertilizer according to claim 8, wherein The rotation speed for stirring is 200 rpm to 600 rpm.

10. The compound fertilizer according to claim 8 or 9, characterized in that, The temperature for drying is 30°C to 60°C.

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