KR20200122702A - Biodegradable mulching liquid and method for manufactruing the same - Google Patents

Abstract

The present invention relates to a biodegradable mulching liquid. The biodegradable mulching liquid according to an embodiment includes: a water-soluble polymer solution in which a water-soluble polymer material is dissolved in water; a carbon-based material mixed with the water-soluble polymer solution and containing at least one of activated carbon, carbon black, and graphite; and a humic acid mixed with the water-soluble polymer solution, wherein the water-soluble polymer material includes polyethylene oxide, a mixture of polyvinyl alcohol and polyethylene oxide, a mixture of polyethylene glycol and polyethylene oxide, or polyethylene.

Description

Biodegradable mulching liquid and its manufacturing method TECHNICAL FIELD [BIODEGRADABLE MULCHING LIQUID AND METHOD FOR MANUFACTRUING THE SAME}

The present invention relates to a mulching liquid, and more particularly, to a liquid mulching liquid that can be biodegradable.

In agriculture, the technology of cultivating crops using vinyl mulching membranes is one of the ten major agricultural technologies in modern times. If the mulching membrane is covered on the soil surface, it is possible to satisfy the demands of heat insulation of crops, water retention, cold damage prevention, weed growth inhibition, pest and pest prevention and subsequent reduction of pesticide use, and maintenance of soil fertility. Since the first mulching membranes were used in Japan in the early 50s, their usage has been increasing at a tremendous rate every year. The application of crop cultivation technology using mulching membranes drastically improved crop production and promoted the world's agricultural development, so the use of vinyl mulching membranes is even called the "white revolution" of agriculture.

However, the use of vinyl mulching membranes causes serious environmental pollution. Vinyl mulching membranes are hydrocarbon polymers made by mixing polyethylene with antioxidants and UV denaturing agents, so they have a large molecular weight and stable characteristics, so it is very difficult to decompose in natural conditions, and the remaining period in the soil is 200~ It is about 400 years.

Currently, a very thin mulching film (0.003~0.006mm) of less than 0.012mm is mainly used. Such mulching membranes have low strength and are not easily torn to a smaller size, so they cannot be recovered and recycled. If they are neglected or lost in nature and mixed into the soil, they cause serious environmental pollution to the soil and the environment for a long time. Indeed, the present rich harvest can be said to be a kind of predatory production method based on the sacrifice of soil potential.

In addition, vinyl mulching membranes have poor breathability and water permeability, so if they remain in the soil, they destroy single grain structures in the soil, interfere with the penetration of capillary water and natural water, and affect the hygroscopicity of the soil, thus impeding water movement. To slow the flow rate of moisture. In addition, it deteriorates the clearance of the soil, obstructs the path of the roots, hinders growth, and lowers the air permeability performance, thereby deteriorating the circulation and exchange of air. It causes excessive or insufficient local moisture, and causes the soil to contain too much carbon dioxide. Therefore, it affects the activity of soil microorganisms and the formation of the normal structure of the soil, lowers the fertility of the soil, and eventually leads to a reduction in crop production.

The residual mulching membrane adversely affects the physical properties of the soil, making the roots of the crop grow short and meandering, and lowering the ability to absorb water and fertilizers, leading to a reduction in crop production. In addition, the residual mulching film is scattered everywhere by the wind from the cultivated land, and it is caught on crops, tree branches and structures around the cultivated land, and also floats on waterways, rivers, and lakes, damaging the natural landscape. When submerged in water, it affects the quality and quantity of irrigation and water supply, and also causes pollution, which has a great impact on aquatic ecosystems.

If residual fragments are mixed with the stems or feed of crops, they impair the gastrointestinal function of livestock, adversely affect the fattening state, and in severe cases may lead to death. When the residual mulching film is incinerated, harmful gases such as dioxins are generated, polluting the atmosphere and causing secondary pollution. In addition, the plasticizer (o-Phthalaldehyde: OPA compound) in the mulching membrane component is low water solubility, high fat solubility, and has remarkable bioaccumulative properties, so it causes harm to the human body via soil, crops, and livestock. It is called pollution.

As one of the methods for solving white pollution, a degradable mulching membrane has been developed and used. Types of biodegradable mulching membranes include a degradable vinyl mulching membrane in which biodegradable natural products such as starch are mixed in a polyethylene base, a solid mulching membrane made by mixing biodegradable natural products such as starch in a water-soluble resin, and fiber or paper mulching membranes.

However, most of the conventional mulching membranes are processed in the form of films or sheets, so that they are not only economically disadvantaged because they require a separate process to lay, maintain, and remove them, and even when they contain functional materials due to poor adhesion to soil. The effect of the functional material is insignificant, it is difficult to adhere to the soil surface, and there is a problem that it is lost by strong winds and heavy rain.

As an alternative to solving this problem, a liquid mulching agent has been developed, and the liquid mulching agent forms a mulching film on the soil surface by spraying a polymer resin emulsion. For example, Japanese Patent Laid-Open No. 2001-45879 discloses a liquid mulching method characterized by spraying a resin emulsion in which plant fibers are dispersed, and Japanese Patent Laid-Open No. 2001-145428 discloses a biodegradable polymer and a carbon-based material. And liquid mulching agents containing colloidal silica are known.

However, mulching membranes formed by conventional liquid mulching agents have poor adhesion to the soil, and have low water resistance, so that the mulching membranes are easily lost due to moisture, or if the membranes have high water resistance, moisture permeability is low, causing the roots of crops to rot. There has been a problem with the function. In addition, in the manufacturing method of the liquid mulching agent, since other substances are mixed with the resin emulsion, it is difficult to achieve uniform mixing of the mixed constituents, and since it is sprayed on the soil in this state, the uniformity of the formed mulching film may be reduced. have.

The present invention is to solve the above-described technical problem, the object of the present invention is excellent in biodegradability of a mulching membrane formed by drying when spraying on soil to prevent contamination by waste vinyl in advance, and to improve strength and density It is intended to provide a biodegradable liquid mulching composition and a method of manufacturing the same, which is capable of forming a solid film without being lost in strong winds or heavy rain by improving soil adhesion.

In addition, an object of the present invention is to provide a composition for biodegradable liquid mulching and a method for producing the same, in which the function of the components contained in the mulching membrane effectively acts on crops to improve the growth of crops.

In addition, it is an object of the present invention to provide a biodegradable liquid mulching composition and a method for producing the same, as well as being able to properly control the moisture of the soil by having appropriate moisture permeability and moisture-containing properties.

The problem to be solved by the present invention is not limited thereto, and other problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

The present invention provides a biodegradable mulching liquid. According to an embodiment, the biodegradable mulching liquid includes a water-soluble polymer aqueous solution in which a water-soluble polymer material is dissolved in water; A carbon-based material mixed with the aqueous polymer solution and containing at least one of activated carbon, carbon black, and graphite; And a humic acid mixed in the water-soluble polymer aqueous solution, wherein the water-soluble polymer material is a mixture of polyethylene oxide, polyvinyl alcohol and polyethylene oxide, a mixture of polyethylene glycol and polyethylene oxide , Or polyethylene.

The polyethylene oxide may be provided with an average molecular weight of 300,000 to 6,500,000. The water-soluble polymer material may be provided in an amount of 0.5 to 5% by weight, the carbon-based material may be provided in an amount of 0.1 to 10% by weight, and the humic acid may be provided in an amount of 0.01 to 2% by weight. The biodegradable mulching liquid further comprises at least one of a vegetable natural polymer material, a water-soluble polymer degradation microorganism, a thixotropic agent, and a functional additive, and the functional additive may include at least one of chitosan, fertilizer, insecticide, fungicide and herbicide. have.

In addition, the present invention provides a method for preparing a biodegradable mulching liquid. A method for preparing a biodegradable mulching liquid includes: preparing an aqueous solution of a water-soluble polymer material by mixing a water-soluble polymer material and water; And adding a carbon-based material and a humic acid to the aqueous polymer solution, wherein the water-soluble polymer material is a mixture of polyethylene oxide, polyvinyl alcohol, and polyethylene oxide, polyethylene glycol ) And a mixture of polyethylene oxide, or polyethylene, and the carbon-based material includes at least one of activated carbon, carbon black, and graphite.

In the addition step, at least one of a vegetable natural polymer material, a water-soluble polymer decomposing microorganism, a thixotropic agent, and a functional additive is further added to the water-soluble polymer aqueous solution, and the functional additive is at least one of chitosan, fertilizer, insecticide, fungicide and herbicide. Can include.

The biodegradable mulching liquid according to an embodiment of the present invention uses humic acid obtained from a high concentration of biological waste and is environmentally friendly because it is biodegradable, and the mulching membrane formed from the biodegradable mulching liquid according to the present invention has not only a weed control effect, but also The moisture-containing properties are improved, so it has an excellent function of controlling the moisture in the soil to the degree necessary for the growth of plants, and the soil adsorption power of the mulching membrane is improved, and it has the appropriate moisture and moisture permeability for the growth of crops, as well as the effect of promoting the growth of crops. Have.

In addition, since the biodegradable mulching solution according to an embodiment of the present invention can control the decomposition rate by adjusting the content of the composition, customized farming is possible. In addition, the biodegradable mulching solution according to an embodiment of the present invention can be sprayed in an aqueous dispersion, so it is easier to install than a conventional vinyl mulching membrane, is hardly affected by the irregularities of the terrain, and is easy to install on slopes. , There is no need to recover the residual mulching film, saving labor costs. In addition, fertilizer application, pesticide, disinfectant and herbicide can be applied together, which is economically advantageous.

1 is a flow chart showing a method of manufacturing a biodegradable mulching solution according to an embodiment of the present invention.
Figure 2 is a table showing the growth state, weed generation inhibitory effect, biodegradability and film formation performance by growing Examples 1 to 3 and Comparative Example 1 of the present invention under the same conditions for 4 months.

Hereinafter, embodiments of the present invention will be described clearly and in detail to the extent that a person having ordinary knowledge in the technical field of the present invention can easily implement the present invention.

As a result of intensive research in order to solve the above-described problems, the present inventors have dissolved a water-soluble polymer material, especially polyethylene oxide (PEO) in water, and then added a carbon-based material and humic acid to provide a composition for liquid mulching. In the case of manufacturing a mulching film by spraying it on the soil surface, it was found to have adequate moisture retention and moisture permeability, improved soil adsorption, and formed a solid film having excellent water resistance, and the present invention was completed.

The humic acid contained in the liquid mulching composition according to the present invention is a material prepared from organic waste liquids such as brewing waste, seaweed waste, molasses production waste, etc., and when using it, it supplies nutrients to the soil to promote growth, and It was found that the formation of the mulching film formed after drying was further promoted, the soil adsorption capacity of the mulching film was improved, and the moisture content properties of the mulching film were improved, so that the function of controlling the moisture in the soil to the level necessary for the growth of plants was found to be excellent.

In addition, by adding a plant-based natural polymer material in addition to the above ingredients, a mulching film can be formed more firmly and adhesion to the soil can be improved by cross-linking, and biodegradability can be further improved by adding a water-soluble macromolecular decomposition microorganism or a mixture thereof. It has been found that it is possible to prevent flow by adding a thixotropic agent, and to prepare a multifunctional liquid mulching composition by adding functional additives such as silicon fertilizer and chitosan, and mixing silicon fertilizer with humic acid. It was found that the film-forming performance was remarkably improved when used.

Accordingly, the present invention provides a composition for liquid mulching containing a water-soluble polymer material, a carbon-based material, and a humic acid, and the composition according to the present invention comprises a vegetable natural polymer material, a water-soluble polymer-degrading microorganism or a mixture thereof, a thixotropic agent, chitosan, magnesium It may further contain one or more selected from fertilizers, silicon fertilizers, pesticides, fungicides and herbicides. The composition for liquid mulching according to the present invention is stored and transported in a concentrated liquid packaged in a plastic container, so its volume and weight are very small, so it is possible to reduce storage costs or transportation costs, and the thickness and characteristics of the mulching film formed by spraying and drying It has the advantage of being uniformly controlled.

In addition, the present invention provides a method for preparing a composition for liquid mulching in which a carbon-based brightener and a humic acid are mixed in a water-soluble polymer dispersion. The manufacturing method according to the present invention can be dispersed in water to prepare a liquid composition. In addition, the mulching method according to the present invention provides that a mulching film is formed while drying on the soil surface by spraying the composition for liquid mulching in an aqueous dispersion state on the soil surface.

Hereinafter, the present invention will be described in more detail. In this case, if there is no other definition in the technical terms and scientific terms used, they have the meanings commonly understood by those of ordinary skill in the technical field to which this invention belongs. In addition, repeated descriptions of the same technical configuration and operation as in the prior art will be omitted.

The composition for liquid mulching according to the present invention may be in a solid state, an emulsion state, or a suspension state, and contains a water-soluble polymer material, a carbon-based material and humic acid as constituents, and additionally contains a vegetable natural polymer. It may further contain one or more selected from substances, water-soluble polymeric decomposing microorganisms or mixtures thereof, thixotropic agents, chitosan, magnesium fertilizers, silicon fertilizers, pesticides, fungicides and herbicides.

The water-soluble polymer material may be provided as a mixture of polyethylene oxide or polyethylene oxide and at least one selected from polyethylene oxide, polyvinyl alcohol or polyethylene glycol. The polyethylene oxide has an average molecular weight of 300,000 to 6,500,000 in terms of film forming performance and water solubility. When the molecular weight of the polyethylene oxide is less than 300,000, the film forming performance is deteriorated, and when the molecular weight exceeds 6,500,000, the water solubility decreases, which is disadvantageous. The above average molecular weight is an atomic mass unit (amu) in terms of relative mass and is dimensionless. Polyethylene oxide is listed in the FDA Inactive Ingredients Guide, and as a result of animal testing, it was found to be non-toxic regardless of the route of administration, and it is known that it is hardly absorbed by the gastrointestinal system and is quickly and completely removed. In addition, since resins do not irritate the skin and eyes, they are widely used as pharmaceuticals or food additives, and there is no problem in stability.

The water-soluble polymer material may be used in a solid or emulsion state, and the content of the water-soluble polymer material is preferably used in an amount of 0.1 to 10% by weight in the liquid mulching composition. More preferably, the use of 0.5 to 5% by weight of the water-soluble polymer material is suitable for the formation of the mulching film and moisture permeability. If the content of the water-soluble polymer material is less than 0.5% by weight, the film-forming function and the durability of the film may be deteriorated, and if the content is more than 5% by weight, the work is impossible due to high viscosity and the biodegradation efficiency is lowered for more than 6 months. Even after this, it is not decomposed and remains on the soil surface, which is not desirable.

The liquid mulching composition according to the present invention can suppress the generation of weeds due to the light blocking effect of the mulching film by adding a carbon-based material as a light blocking agent. In addition, by containing a carbon-based material, it is possible to increase or control geothermal heat by absorbing sunlight. As the carbon-based material, activated carbon, carbon black, graphite, or a mixture thereof may be used, and in terms of effect and economy, it is more preferable to use activated carbon, carbon black or a mixture thereof. The content of the carbon-based material is preferably used in an amount of 0.1 to 10% by weight in the liquid mulching composition. When the content of the carbon-based material is less than 0.1% by weight, the light-shielding effect and the geothermal thermal insulation effect are insignificant, and when the content exceeds 10% by weight, the film formation and water dispersibility of the composition for liquid mulching may be inhibited. Not.

The humic acid contained in the composition for liquid mulching according to the present invention generally refers to a residue from which plants have been corroded in the ground for a long period of time. The humic acid may be commercially available or may be directly manufactured, and the manufacturing method includes, for example, fermenting and drying brewing waste, seaweed waste, molasses manufacturing waste, and other high-concentration organic waste liquid using a general compost manufacturing method. It's rough.

The humic acid content according to the present invention is preferably 0.01 to 2% by weight of the composition for liquid mulching. If the humic acid content is less than 0.01% by weight, the effect on the moisture content of the mulching film, the soil adsorption capacity, and the film formation of the mulching film may be insignificant, and if the content exceeds 2% by weight, the dispersibility and workability of the mulching composition This can be weakened and is not desirable.

Humic acid promotes nutrient absorption and serves as a direct source of nutrients. Humic acid promotes energy metabolism such as photosynthesis and respiration of plants. Humic acid promotes the growth of crops by affecting the production and activity of various enzymes. Since humic acid has hydrophilic and lipophilic groups at the same time, it can easily penetrate the phospholipid structure of the cell membrane, thus acting as a carrier, enhancing the permeability of the cell membrane of plants, and promoting the absorption of urea by epidermal cells. Humic acid increases microbial density by supplying phosphoric acid and carbon, which are essential for microbial growth. By the action of these microorganisms, the solubility of trace elements (Fe, Zn, Mn, etc.) or some large elements (K, Ca, P) is enhanced to facilitate the absorption of crops.

The humic acid added to the soil improves the soil structure by changing the ratio of moisture and air in the root zone. In addition, since humic acid is not only hydrophilic but also lipophilic, it is easy to retain a nonionic solute. Since humic acid has high cation substitution capacity (CEC) and high complex-forming ability, it retains various cations and organic compounds and continuously releases them to plants. In addition, humic acid has the effect of increasing the buffering capacity of soil acidity. Humic acids strongly adsorb nonionic organic compounds such as pesticides and pollutants, thereby dissolving nonionic organic compounds and preventing them from being used in crops.

The composition for liquid mulching according to the present invention may further contain a vegetable natural polymer material. When the composition for liquid mulching further contains a plant-based natural polymer material, the water dispersibility of the composition is improved, the cross-linking performance and soil adhesion of the mulching membrane are improved, and it has adequate moisture permeability, so it works very excellently on plant growth. The vegetable natural polymer may include polysaccharides such as starch and its derivatives, cellulose derivatives such as cellulose, methylcellulose, carboxy methyl cellulose, and hydroxymethyl cellulose, or mixtures thereof, and the content of the vegetable natural polymer material is liquid mulching. It is preferably 0.1 to 2% by weight of the composition. When the content of the vegetable natural polymer is less than 0.1% by weight, the effect of improving the crosslinking performance of the mulching membrane or improving the soil adhesion is insignificant, and when the content exceeds 2% by weight, the durability of the mulching membrane may be reduced.

The composition for liquid mulching according to the present invention may further include a water-soluble polymer-decomposing microorganism or a mixture thereof. When the composition for liquid mulching further contains a water-soluble polymer-decomposing microorganism or a mixture thereof, it prevents acidification of the soil, maintains good soil quality, and has an effect of increasing the growth rate of plants. The microorganisms may be those obtained by screening for water-soluble macromolecular decomposition microorganisms with a solution obtained by filtering out solids after well-dispersed humus collected from cultivated land (field) in water.

The content of the water-soluble polymer-decomposing microorganism or a mixture thereof is proportional to the content of the water-soluble polymer material, and the content of the water-soluble polymer-decomposing microorganism or a mixture thereof is preferably used in the range of 0.0001 to 0.01% by weight in the composition for liquid mulching. When the content is less than 0.0001% by weight, the effect of improving the decomposition rate of the water-soluble polymer is insignificant, and when it exceeds 0.01% by weight, the rate of decomposition of the water-soluble polymer may be too fast. It is preferable that the liquid mulching composition is completely decomposed in 3 to 6 months. Therefore, if the amount is out of the range, the decomposition period is less than 3 months or more than 6 months, which is not preferable.

The composition for liquid mulching according to the present invention may further include a thixotropic agent. When the composition for liquid mulching further contains a thixotropic agent, it has the effect of preventing dripping when sprayed. For example, the thixotropic agent may be carboxyl methyl cellulose (CMC), methyl cellulose (MC) and hydroxyethyl cellulose (HEC) or sodium alginate, taking into account soil contamination. have. The content of the thixotropic agent is preferably used in the range of 0.1 to 1% by weight of the composition for liquid mulching. If it is less than the above range, the effect of suppressing flow is insignificant, and if it exceeds the above range, spray workability is poor.

In addition, the composition for liquid mulching according to the present invention may further include a fertilizer, such as chitosan, magnesium fertilizer, and silicon fertilizer, an insecticide, a fungicide, a herbicide, and the like as functional additives. In the present invention, when a functional additive is added, the additives in the film are coagulated together by forming a film, and then gradually dissolved by water to have an effect as a release controller that continuously supplies to the roots of crops.

Among the functional additives, chitosan is processed so that chitin contained in crustaceans is easily absorbed by plants, and specifically refers to a material obtained by deacetylating chitin contained in the shells of crabs, crayfish and shrimp. By adding chitosan, it is possible to reduce the amount of pesticides used by activating the cells of the crops to strengthen immunity, preventing diseases, and activating the natural healing ability, and also discharges heavy metals and pollutants that the crops have already absorbed. Shows the effect of the function. In addition, when a silicon fertilizer is further contained among the functional additives, the effect of improving the film forming performance is exhibited. The content of the functional additive may be added in an amount of 0.01 to 1% by weight of the liquid mulching composition. If it is added in an amount less than the above, the effect may be insignificant, and if the amount is exceeded, the fertilization content in the soil may be too high, which is not preferable.

Hereinafter, a method for preparing the liquid mulching composition according to the present invention will be described.

1 is a flow chart showing a method of manufacturing a biodegradable liquid mulching composition according to an embodiment of the present invention. Referring to FIG. 1, the composition for liquid mulching according to the present invention may be in a solid state, an emulsion state, or a suspension state, and is prepared by a manufacturing method including the following manufacturing steps.

According to an embodiment, the composition for liquid mulching includes an aqueous solution preparation step (S10) and an addition step (S20). In the aqueous solution preparation step (S10), a water-soluble polymer material and water are mixed to prepare a water-soluble polymer aqueous solution. In the aqueous solution preparation step (S10), a mixture of a water-soluble polymer material and water may be heated to completely dissolve the water-soluble polymer material. In this case, the heating temperature is preferably 40 to 80°C. When the heating temperature is less than 40° C., the dissolution effect may be insignificant. When the heating temperature exceeds 80° C., energy efficiency for heating decreases.

In the addition step (S20), a carbon-based material and a humic acid are added to the water-soluble polymer aqueous solution prepared in the aqueous solution preparation step (S10). Optionally, in the addition step (S20), at least one of the above-described vegetable natural polymer, a water-soluble polymer decomposing microorganism or a mixture thereof, a thixotropic agent and a functional additive may be further added to the water-soluble polymer aqueous solution prepared in the aqueous solution preparation step (S10). .

In addition, the present invention provides a mulching method using the composition for liquid mulching in the aqueous dispersion state prepared by the above manufacturing method. The mulching method according to the present invention is to spray a composition for liquid mulching in an aqueous dispersion state on the soil surface to dry on the soil surface to form a mulching film, and the spraying method may be performed using a conventional spreader or sprayer. Since the mulching membrane formed by the mulching method according to the present invention is biodegradable in 3 to 6 months, it is environmentally friendly, and the process of recovering the mulching membrane is unnecessary, so labor costs can be reduced.

<Example 1>

A composition for liquid mulching was prepared made of the materials described below.

1. Polyethylene oxide (PEO, average molecular weight (Mw): 1,600,000, manufacturer: Japan, Meisei Chemical, product name: ALKOX): 30g

2. Powdered activated carbon (manufacturer: Gaya activated carbon industry, type: D-1-10-30): 20g

3. Water-soluble humic acid (manufacturer: Daishin Corporation, product name: Multi-Humic Soluble, Granule): 5g

4. Starch: 2g

5.Carbon Methyl Cellulose (CMC, Manufacturer: China Hercules Chemicals Company Ltd., Product Name: Sodium Carboxymethyl Cellulose): 10g

6. Water: 1000mL containing the above substances

Polyethylene oxide (PEO) and water are added to the reaction and dissolution device of the liquid mulching agent, heated and stirred at 60°C to completely dissolve, and then starch, activated carbon, humic acid and CMC powder are sequentially added to have a solid content of 3.4% by weight. 1L of a composition for liquid mulching was prepared.

<Example 2>

A composition for liquid mulching was prepared in the same manner as in Example 1, except that 0.01 g of soil microorganisms having PEO degradability was further added to the composition for liquid mulching of Example 1.

The soil microorganisms having PEO degradability were obtained by screening water-soluble macromolecular-degrading microorganisms with a solution obtained by filtering out solids after well-dispersing humus collected from a farmland (field) using a liquid mulching agent.

<Example 3>

To the liquid mulching composition of Example 2, 0.5 g of a siliceous fertilizer (manufacturer: Saturn Biotech Co., Ltd., product name: Silicate Granules) and 1 g of sodium alginate (manufacturer: Qingdao Bright Moon Seaweed Group Co. Ltd., China) were further added. Except that, a liquid mulching composition was prepared in the same manner as in Example 2.

<Comparative Example 1>

A conventional vinyl mulching film (manufacturer: Ilshin Chemical, product name: black HDPE film for agriculture) was used as Comparative Example 1.

After forming a mulching film as follows using the liquid mulching composition prepared in Examples 1 to 3 and Comparative Example 1, physical properties were measured. On the farmland, agricultural test pavements (area: 700cmX445cm) are installed repeatedly by the egg mass method three times, soybeans (golden beans) are sown (planting distance: 60cm × 15cm), and mulching agents are not used at all under the same climatic conditions. The unused bare land was compared with the composition of Examples 1 to 3 and the result of forming a mulching film with Comparative Example 1 as a control.

Figure 2 is a table showing the growth state, weed generation inhibitory effect, biodegradability and film formation performance by growing Examples 1 to 3 and Comparative Example 1 of the present invention under the same conditions for 4 months. 2, the growth state was determined based on the height of the crop and the quantity of fruit, and if it was 15% or more compared to the control, it was considered as good if it was more than 30%, and if it decreased by 15% compared to the control, it was bad and the difference from the control was almost None (± 15%) was taken as normal.

In addition, in the case of suppression of weed occurrence, it was determined in the same manner as the growth state based on the number of weeds, and biodegradability was very good if more than 90% was removed after 6 months, depending on whether or not it remained, 70~90% good, 40~70% normal If it was less than 50%, it was determined as defective. The film-forming performance was evaluated relative to the strength of the deposited soil surface until it was broken by pressing it with a finger, and it is very good when a very hard and tough film is formed, and it is good if a hard film is formed clearly, and when it is barely felt, it is usually about the control. The back side was identified as defective.

As shown in Figure 2, the growth state of Examples 1 to 3 performed by the mulching method according to the present invention exhibited excellent results compared to Comparative Example 1, and in terms of the weed generation inhibitory effect, Comparative Example 1 using a black mulching film It showed an effect equivalent to that of. In terms of biodegradability, all of Examples 1 to 3 were degraded within 6 months, and in particular, Examples 2 and 3 containing water-soluble macromolecular degrading microorganisms showed a result of decomposition within 4 months compared to Example 1 not containing it. Done. In terms of film formation performance, all of Examples 1 to 3 showed good film formation performance, and in Example 3 using a siliceous fertilizer, the strength of the formed film was slightly improved by the action of the siliceous substance and the thixotropic agent.

The above description is a detailed example for carrying out the present invention. In addition to the above-described embodiments, the present invention will include simple design changes or embodiments that can be easily changed. In addition, the present invention will also include techniques that can be easily modified and implemented using the embodiments. Accordingly, the scope of the present invention is limited to the above-described embodiments and should not be defined, and should be defined by the claims and equivalents of the present invention as well as the claims to be described later.

Claims (6)

A water-soluble polymer aqueous solution in which a water-soluble polymer material is dissolved in water;
A carbon-based material mixed with the aqueous polymer solution and containing at least one of activated carbon, carbon black, and graphite; And
Including humic acid mixed in the water-soluble polymer aqueous solution,
The water-soluble polymer material is polyethylene oxide, a mixture of polyvinyl alcohol and polyethylene oxide, a mixture of polyethylene glycol and polyethylene oxide, or a biodegradable mulching solution containing polyethylene. The method of claim 1,
The polyethylene oxide is a biodegradable mulching solution provided with an average molecular weight of 300,000 to 6,500,000. The method of claim 1,
The water-soluble polymer material is provided in 0.5 to 5% by weight,
The carbon-based material is provided in an amount of 0.1 to 10% by weight,
The humic acid is a biodegradable mulching solution provided in 0.01 to 2% by weight. The method of claim 1,
It further comprises at least one of a vegetable natural polymer material, a water-soluble polymer degradation microorganism, a thixotropic agent and a functional additive,
The functional additive is a biodegradable mulching liquid comprising at least one of chitosan, fertilizer, pesticide, fungicide and herbicide. In the method of preparing a biodegradable mulching liquid,
An aqueous solution preparation step of mixing a water-soluble polymer material and water to prepare a water-soluble polymer aqueous solution;
Including an addition step of adding a carbon-based material and humic acid to the water-soluble polymer aqueous solution,
The water-soluble polymer material includes polyethylene oxide, a mixture of polyvinyl alcohol and polyethylene oxide, a mixture of polyethylene glycol and polyethylene oxide, or polyethylene,
The carbon-based material is a method for producing a biodegradable mulching liquid comprising at least one of activated carbon, carbon black, and graphite. The method of claim 5,
In the addition step, at least one of a vegetable natural polymer material, a water-soluble polymer degradation microorganism, a thixotropic agent, and a functional additive is further added to the water-soluble polymer aqueous solution,
The functional additive is a method for producing a biodegradable mulching liquid comprising at least one of chitosan, fertilizer, pesticide, fungicide and herbicide.

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