TW202043442A - Soil-erosion prevention material and soil-erosion prevention method - Google Patents

Abstract

Provided is a soil-erosion prevention material containing at least one type of emulsion selected from the group consisting of synthetic resin emulsions and biodegradable resin emulsions, and humic acid having a melanic index within a range from 1.5 to 3.0. Also provided is a soil-erosion prevention material containing at least one type of emulsion selected from the group consisting of synthetic resin emulsions and biodegradable resin emulsions, polyvinyl alcohol, and humic acid having a melanic index within a range from 1.5 to 3.0. Also provided is a soil-erosion prevention material containing polyvinyl alcohol and humic acid having a melanic index within a range from 1.5 to 3.0.

Description

Soil outflow prevention materials and soil outflow prevention methods

The present invention relates to soil outflow prevention materials. The present invention relates to, for example, a soil outflow prevention material that promotes the growth of crops and prevents soil outflow, and a soil outflow prevention method.

In farmland, plants other than the target crops are generally treated as weeds, so there are often exposed places on the ground. Such farming land will erode the surface soil due to rainfall, etc., and there will be problems of soil erosion and soil loss caused by the simultaneous outflow of surface soil and rainwater. The discharged soil will damage the growth of rivers and marine life due to water pollution or soil accumulation. Some people have adopted the method of setting up vegetation belts (green belts) in order to restrain the soil from flowing out to the cultivated land, and using the green belts to capture the soil flowing to the surface layer to reduce the soil outflow.

Furthermore, in civil engineering sites, etc., in order to prevent the soil from flowing out, a film is made by spreading synthetic resin on the surface of the soil so that rainwater flows on the surface of the resin to prevent erosion of the soil surface due to rainfall.

As far as synthetic resin is concerned, it is a water-soluble emulsion that uses vinyl acetate, copolymerizable acrylate, ethylene and other vinyl monomers to copolymerize to form a softer film inside which is plasticized. In the preparation of this water-soluble emulsion, in order to stably copolymerize vinyl acetate and the above-mentioned highly hydrophobic vinyl monomers, emulsifiers such as anionic, cationic, and nonionic surfactants must be used, or must A water-soluble polymer protective colloid such as polyvinyl alcohol (hereinafter referred to as PVA) is used (refer to Patent Document 1).

Someone has proposed a soil erosion inhibitor, which is a soil erosion inhibitor containing a synthetic resin emulsion. The solid content of the emulsion is 30 to 70% by mass, and the water content is adjusted by the solid content of the emulsion or 40% by mass. After the measurement, the viscosity measured at 30°C is 50 mPa･s or less (refer to Patent Document 2).

Some people propose a humic acid extract with a pH in the range of 5.0 to 7.0 and a total organic carbon concentration of 20,000 mg/L or more (see Patent Document 3). It has been proposed that the soil for crop cultivation is characterized by: using the micropowder of the humic material of sphagnum or sphagnum moss as the main component, and the micropowder of the aluminosilicate mineral with permanent negative charge, and adding the micropowder of the clay material, and A binder made of any of montmorillonite, carboxymethyl cellulose, polyvinyl alcohol, and lignin is kneaded and granulated (see Patent Document 4). [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Publication No. 57-59983 [Patent Document 2] International Publication No. 2015/122333 [Patent Document 3] JP 2017-71522 A [Patent Document 4] Japanese Patent Application Publication No. 62-79714

[The problem to be solved by the invention]

The problem to be solved by the present invention is to provide a soil outflow prevention material that increases the yield of crops. [Means to solve the problem]

The present invention is a soil outflow prevention material, which contains one or more emulsions in the group consisting of synthetic resin emulsions and biodegradable resin emulsions, and humic acid with a jet black index of 1.5 to 3.0. In addition, the present invention is a soil outflow prevention material, which contains one or more emulsions in the group consisting of synthetic resin emulsions and biodegradable resin emulsions, polyvinyl alcohol, and humic acid with a jet black index of 1.5 to 3.0. In addition, the present invention is a soil outflow prevention material containing polyvinyl alcohol and humic acid with a jet black index of 1.5 to 3.0. In addition, the present invention is a method for preventing soil outflow, which spreads any one of the above-mentioned soil outflow prevention materials to the soil. [Effects of Invention]

The present invention can provide a soil outflow prevention material that increases the yield of crops.

In the following, embodiments of the present invention will be described in detail. The solid content is also called non-volatile content in the following. The embodiments of the present invention are, for example, the following (1) to (3). (1) A soil outflow prevention material containing at least one emulsion in the group consisting of synthetic resin emulsion and biodegradable resin emulsion, and humic acid. (2) A soil outflow prevention material containing at least one emulsion, polyvinyl alcohol, and humic acid from the group consisting of synthetic resin emulsion and biodegradable resin emulsion. (3) Soil outflow prevention material containing polyvinyl alcohol and humic acid.

The emulsion used in this embodiment is one or more of the group consisting of a synthetic resin emulsion and a biodegradable resin emulsion (hereinafter, it may be simply referred to as an emulsion). As for the synthetic resin emulsion used in this embodiment, a water-soluble emulsion (hereinafter, also referred to as a water-soluble emulsion) is more preferable.

As for the water-based resin used in water-soluble (hereinafter, sometimes referred to as water-based) emulsions, examples include: vinyl acetate polymer, vinyl acetate copolymer, (meth)acrylate, styrene-( (Meth)acrylate copolymer, styrene-butadiene copolymer, vinylidene resin, polybutene resin, (meth)acrylonitrile-butadiene resin, (meth)acrylate-butadiene resin , Asphalt, epoxy resin, urethane resin, silicone resin, etc. As for the vinyl acetate copolymer, a copolymer of vinyl acetate and an ethylenically unsaturated monomer is more desirable. Among the ethylenically unsaturated monomers, ethylene is more desirable. Among them, a copolymer of vinyl acetate and an ethylenically unsaturated monomer is more desirable, and an ethylene-vinyl acetate copolymer is more desirable.

Examples of ethylenically unsaturated monomers that can be copolymerized with vinyl acetate include olefins such as ethylene, propylene, and isobutylene; halogenated olefins such as vinyl chloride, vinyl fluoride, vinylidene chloride, and vinylidene fluoride. ; Vinyl formate, vinyl acetate, vinyl propionate, third vinyl carbonate and other vinyl esters; (meth)acrylate, (meth)acrylate, (meth)ethylacrylate, (methyl) ) Butyl acrylate, 2-ethylhexyl (meth)acrylate, dodecyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate and other (meth)acrylates; (former Yl) dimethylaminoethyl acrylate and their quaternary products, (meth)acrylamide monomers and sodium salts thereof, styrene monomers, N-vinylpyrrolidone, diene monomers. Among them, olefins are more desirable. Among olefins, ethylene is more desirable.

Ethylene-vinyl acetate copolymer emulsion (hereinafter, also referred to as EVA emulsion) means an emulsion using ethylene-vinyl acetate copolymer (hereinafter, also referred to as EVA) as a polymer. The glass transition temperature of EVA polymer is preferably below 20°C, and more preferably below 10°C. The glass transition temperature of EVA polymer is preferably above -50°C, more preferably above -10°C.

The glass transition referred to here refers to the change of a substance that is liquid at high temperature, that is, glass, etc., which rapidly increases its viscosity within a certain temperature range due to a temperature drop, and becomes an amorphous solid that almost loses fluidity. The method for measuring the glass transition temperature is not particularly limited, and generally refers to the glass transition temperature calculated by thermogravimetry, differential scanning calorimetry, differential thermal measurement, and dynamic viscoelasticity measurement. Among them, the dynamic viscoelasticity measurement is more ideal.

The polymer composition of EVA should preferably be ethylene/vinyl acetate (mass ratio)=(5~40)/(95~60) is ideal, (10~30)/(70~90) is more ideal. EVA emulsion is usually used in liquid form, but also in powder form.

Regarding the polymer in the biodegradable resin emulsion used in this embodiment (hereinafter also referred to as biodegradable emulsion), for example, polylactic acid, polycaprolactone, polyhydroxyalkanoate, polyglycolic acid, modified Polyvinyl alcohol, casein, modified starch resin, etc. (hereinafter also referred to as biodegradable resin). Among them, polylactic acid is more desirable. The glass transition temperature of the biodegradable resin is preferably below 20°C, more preferably below 10°C. The glass transition temperature of the biodegradable resin is preferably above -50°C, more preferably above -10°C.

The humic acid used in this embodiment includes humic acid and humate. In terms of humic acid, for example, natural humic acid produced naturally such as peat or weathered coal, artificial humic acid produced artificially by the oxidation of nitric acid using lignite, and for example, the use of sodium, potassium, ammonia, calcium, and magnesium Humic acid and other alkaline substances neutralized natural humic acid or artificial humic acid. In terms of humic acid, for example: Humic acid, NitroHumic acid, ammonium humate, calcium humate, magnesium humate, ammonium nitrohumate, calcium nitrohumate, Magnesium nitrohumate, etc. Among the humic acids, humic acid extract is more ideal, and finely pulverized products with a median particle size of 1-10μm can also be used. For the humic acid extract, for example, a humic acid extract with a pH of 5.0 to 7.0 and a total organic carbon concentration of 20,000 mg/L or more can be used. For humic acid extracts, humic acid extracts with a total organic carbon concentration of 100,000 mg/L or less can be used.

The humic acid of this embodiment is characterized in that the Melanic index (Melanic index, hereinafter referred to as "MI") is 1.5 to 3.0.

Here, MI is an index used to classify humic acid, which is the ratio of the absorbance at 450nm and 520nm of the absorption spectrum of the sodium hydroxide extract (A ₄₅₀ /A ₅₂₀ ). (Kumada Kyouichi, Publishing Center of the Society of Soil Organic Chemistry 2nd Edition (1981), Japanese Journal of Soil and Fertilizer Science No. 71, No. 1, p.82~85 (2000)).

More specifically, MI in this embodiment is calculated by the following method. Use a mortar and a 250μm sieve to crush the sample into a 250μm sieve. Put about 10g of it into a weighing bottle of known mass and weigh it accurately. The weighing bottle was placed in a dryer maintained at 105°C for about 12 hours, and then returned to room temperature in the dryer and weighed again. This mass reduction amount is regarded as moisture, and the moisture content of the sample is obtained. Then, in a 50ml centrifuge tube, put 0.10g of the above-mentioned 250μm undersize and 45ml of 0.5mol/L sodium hydroxide aqueous solution with a dry mass equivalent of 0.10g. After centrifugation at room temperature 20℃ at 250rpm for about 1 hour, implement Centrifuge at 3,000×g for about 10 minutes, and filter the supernatant with No.5C filter paper manufactured by ADVANTEC CO., LTD. Use distilled water as the blank group to measure the absorbance at 450 nm and absorbance at 520 nm of the filtrate. At this time, if the absorbance at 450 nm indicates 1.0 or more, a 0.1 mol/L sodium hydroxide aqueous solution is added to adjust the absorbance to 0.8 or more and less than 1.0, and the absorbance at 520 nm is measured. Calculate the ratio of (absorbance at 450 nm/absorbance at 520 nm) as MI.

If MI is 1.5 or more, it means that it has sufficient active groups such as alcoholic hydroxyl group and methoxy group, and the soil improvement effect can be expected. If MI is below 3.0, excessive oxidation reaction can be suppressed and the cost of nitric acid can be reduced.

The increase or decrease of MI from 1.5 to 3.0 can be carried out by increasing or decreasing the amount of nitric acid during the production of humic acid. If the amount of nitric acid is higher, MI increases. On the other hand, the MI of natural humic acid without nitric acid oxidation is about 1.7 or less. According to the nature of the soil, humic acid with MI of 2.0 or less is used when further soil improvement effects are expected. If the MI of humic acid is 2.0 or more, it will show activity for crops. The nature of humic acid can be selected according to the purpose of use.

Humic acid uses extracts of humic acid in Patent Document 3, etc. Since the nozzle diameter is large when the emulsion is dispersed, finely pulverized products with a median diameter of 1.0 to 10.0 μm can also be used. The amount of humic acid used in this embodiment has little effect on physical properties such as the viscosity of the emulsion shown below.

In this embodiment, polyvinyl alcohol (PVA) can also be used. The polyvinyl alcohol (PVA) of this embodiment is used, for example, as a dispersant for a water-soluble emulsion. The average degree of polymerization of PVA is ideally 100~4000, 1000~3500 is more ideal, 2000~3000 is most ideal. The higher the average degree of polymerization of PVA, the higher the emulsifying and dispersing power, so in order to obtain an emulsion with the desired dispersibility, polyvinyl alcohol with an appropriate average degree of polymerization can be used. Regarding the saponification degree of polyvinyl alcohol, considering the improvement of water solubility, 70% or more is ideal, and 80-95% is more ideal. Here, the average degree of polymerization or saponification degree of PVA is a value measured according to the method of JIS K 6726.

The amount of each component used is as follows. When it is a soil outflow prevention material containing emulsion and humic acid, or when it is a soil outflow prevention material containing emulsion, polyvinyl alcohol and humic acid, the amount of humic acid used is based on the solid content relative to 100 parts by mass of the emulsion (solid content) In terms of conversion, 0.01 to 5 parts by mass is ideal, 0.01 to 3 parts by mass is more ideal, and 0.1 to 3 parts by mass is the most ideal. When it is a soil outflow prevention material containing polyvinyl alcohol and humic acid (especially when no emulsion is used), the amount of humic acid used is preferably 0.01 per 100 parts by mass (solid content) of polyvinyl alcohol, calculated as solid content. ~5 parts by mass is ideal, and 0.1~3 parts by mass is more ideal. When it is a soil outflow prevention material containing emulsion, polyvinyl alcohol and humic acid, the amount of PVA used is preferably 0.5-20 parts by mass relative to 100 parts by mass (solid content) of the emulsion (solid content), preferably 0.5-20 parts by mass, 1~ 10 parts by mass is more desirable. In the case of a soil outflow prevention material containing emulsion, polyvinyl alcohol and humic acid, the content of the emulsion, polyvinyl alcohol and humic acid in 100% by mass of the soil outflow prevention material (solid content), calculated as solid content, is as follows. The content of the emulsion is preferably 80~98.5% by mass, more preferably 93~98% by mass. The content of polyvinyl alcohol is preferably 0.3-20% by mass, more preferably 2-7% by mass. The content of humic acid is preferably 0.005-8% by mass, more preferably 0.5-2% by mass.

The soil outflow prevention material is diluted with water and then used. When diluted with water, the solid content of the soil outflow prevention material is preferably 5~45% by mass, and more preferably 5~20% by mass. When the solid content concentration is 5% by mass or more, the effect increases. When the solid content concentration is 45% by mass or less, the viscosity decreases and the soil outflow prevention material can be easily spread.

The method of using the soil outflow prevention material of this embodiment will be described. The soil outflow prevention material can be used alone for the soil to be protected, or it can be mixed with soil that has been mixed with seeds or fertilizers. The method of applying the soil outflow prevention material to the target surface is not particularly limited, and examples include spreading or spraying.

The usage amount (solid content) of the soil outflow prevention material is 100~5000g/m ² for every 1m ^{2 of the} field, preferably 250~1000g/m ² .

In this embodiment, when the soil is red soil, it has an excellent effect. For example, subtropical islands such as Okinawa will erode the red soil on construction sites or agricultural land due to strong rainfall and flow out to rivers or oceans, which will have a negative impact on the water environment. In this embodiment, by preventing the outflow of red soil, pollution of rivers or oceans can be prevented, and the growth of plants and plants can be protected, and durability, weather resistance, workability, and soil outflow prevention effect under severe weather conditions can be improved.

For example, when the physical properties of red clay are as follows, it has an excellent effect. For the following red soil, for example, Guotou combined soil can be cited. When the laterite is acidic. For example, the pH of red clay is 4 or more and 6 or less. When red clay contains a lot of iron. For example, when the content of iron oxide (III) is 5% by mass or more and 15% by mass or less. When red clay contains a large amount of aluminum. For example, when the content of alumina is 10% by mass or more and 20% by mass or less.

Although the content of red soil is described above, black soil or brown lowland soil may also flow out due to conditions such as inclination. Although the description of this embodiment focuses on red clay, the effect of this embodiment is not limited to red clay. This embodiment can also be used for black soil or brown lowland soil. [Example]

The following is an explanation based on the experimental example of this embodiment. Unless specifically limited, the term "fields" in the following experimental examples means the following fields set up for the purpose of illustrating the experimental examples. The outline is shown in Figure 1. The field 11 is a structure with a slope of 3%, a width of 2.8m, and a length of 30m. It is filled with soil 4 for cultivation. The lower part of the structure is equipped with a measuring tool 3 that can store outflow water 2 caused by precipitation 1. Outflow water 2 includes surface water flowing on the surface of the field and soil flowing due to the water. The soil 4 of the field is red soil (pH5, iron oxide (III) content 8% by mass, and alumina content 18% by mass). A construction test and a soil outflow prevention test were conducted on this field, and sugarcane was also cultivated to test the yield of sugarcane.

Example 1 100 parts by mass of synthetic resin emulsion (solid content), 5 parts by mass (solid content) of PVA, 0.5 parts by mass (solid content) of humic acid with a jet black index of 2.2 were mixed, and the following test was performed on the obtained soil outflow prevention material. The evaluation is shown in Table 1. Here, Denka EVA TEX50 (solid content 55% by mass, ethylene/vinyl acetate (mass ratio) = 20/80, glass transition temperature 0°C, manufactured by Denki Kagaku Kogyo Co., Ltd.) is used for the synthetic resin emulsion system, and the PVA aqueous solution system Use DENKA POVAL B-24N (average degree of polymerization 2400, saponification degree of 88 mol%, manufactured by Denki Kagaku Kogyo Co., Ltd.), humic acid system uses humic acid extract (solid content concentration 13% by mass, pH 6-7, all carbon The amount is 50000mg/L).

[Construction test] 250 g (solid content) of the soil outflow prevention material of this embodiment was diluted 8 times with water. Spread the water-diluted soil outflow prevention material at a ratio of 500g/m ² (solid content) evenly to the field using a watering device. The soil of the field is red soil. ◎: Good workability (the soil outflow prevention material can be discharged uniformly from the watering device) ○: The workability is slightly good (there is no uniform discharge of the soil outflow prevention material from the watering device) △: Poor workability (difficult to water from (Exhaust soil outflow prevention material)

[Soil outflow prevention test] The content of the soil was determined by mixing the effluent water 2A flowing into the measuring tool 3 with a mixer to homogenize it and then sampling it into a 1 liter plastic bottle. The measurement was carried out in accordance with Japan's "Environment Agency Bulletin No. 59, Attached Table 9". ○: The turbidity of the outflow water is thin (the soil content in the outflow water 2A is less than 100ppm) △: The turbidity of the outflow water is slightly thicker (the soil content in the outflow water 2A is more than 100ppm and less than 200ppm) ×: The turbidity of the outflow water is thick (the soil content in the outflow water 2A is more than 200ppm)

[Sugarcane yield test] After planting sugarcane seedlings in the field, the soil outflow prevention material shown in the composition of Table 1 is diluted to 8 times with water, and the ratio of 500g/m ² (solid content) is used with a watering device Evenly spread to the fields. The yield index is calculated as the yield relative to the yield of 100 in the customary zone where no soil outflow prevention material is used. ○: The growth and yield of sugarcane is good (compared to the conventional area without soil outflow prevention material, the yield index is 103 or more) △: The growth and yield of sugarcane is normal (compared to the conventional area without soil outflow prevention material, Yield index is less than 103 and above 95) ×: The growth and yield of sugarcane is normal (compared to the customary areas where soil outflow prevention materials are not used, the yield index does not reach 95)

Examples 2~6, Example 9, Comparative Example 4 In Examples 2 to 6, Example 9, and Comparative Example 4, the composition of the soil outflow prevention material and the amount of spread of the soil outflow prevention material were replaced with the amounts shown in Table 1. For these examples, the same test as in Example 1 was performed, and the evaluation results are shown in Table 1. Here, as the biodegradable resin emulsion, a polylactic acid resin emulsion (solid content 40% by mass, glass transition temperature 0°C, manufactured by Miyoshi Oil & Fat Co., Ltd.) was used.

Comparative example 1 In Comparative Example 1, the composition of the soil outflow preventing material and the spreading amount of the soil outflow preventing material were replaced with those shown in Table 1. For Comparative Example 1, the same test as Example 1 was also performed, and the evaluation results are shown in Table 1.

Example 7 In Example 7, the composition of the soil outflow prevention material and the spread amount of the soil outflow prevention material were replaced with those shown in Table 1. For Example 7, the same test as Example 1 was also performed, and the evaluation results are shown in Table 1.

[Table 1] Soil outflow prevention material Synthetic resin emulsion Biodegradable emulsion PVA aqueous solution Humic acid Construction test Sugarcane yield test Soil outflow prevention test unit g/m ² Mass parts Mass parts Mass parts Mass parts Example 1 500 100 0 5 0.5 ◎ ○ ○ Example 2 500 100 0 5 3 ◎ ○ ○ Example 3 500 100 0 1 1 ◎ ○ ○ Example 4 500 100 0 7 1 ◎ ○ ○ Example 5 200 100 0 5 1 ◎ ○ △ Example 6 1500 100 0 5 1 ○ ○ ○ Comparative example 1 500 100 0 5 0 ◎ × ○ Example 7 500 100 0 0 3 △ ○ △ Example 9 500 0 100 5 1 ◎ ○ ○ Comparative example 4 500 0 100 5 0 ◎ × ○ The unit of the spreading amount of the soil outflow prevention material is g/m ² (calculated as solid content). The unit of the synthetic resin emulsion and the biodegradable resin emulsion is parts by mass (in terms of solid content). The unit of the PVA aqueous solution is a part by mass (in terms of solid content) relative to a total of 100 parts by mass (solid content) of the synthetic resin emulsion and the biodegradable resin emulsion. The amount of humic acid used is based on 100 parts by mass (solid content) of the total of the synthetic resin emulsion and the biodegradable resin emulsion (in terms of solid content).

Example 8 100 parts by mass of PVA (solid content) and 1 part by mass of humic acid (solid content) were mixed, and the same test as in Example 1 was performed on the obtained soil outflow prevention material. The evaluation is shown in Table 2. No emulsion was used in Example 8.

Comparative example 2~3 In Comparative Examples 2 to 3, the composition of the soil outflow preventing material and the amount of spreading of the soil outflow preventing material were changed to the amounts shown in Table 2. For these examples, the same test as in Example 8 was also performed, and the evaluation results are shown in Table 2.

[Table 2] Soil outflow prevention material PVA aqueous solution Humic acid Construction test Sugarcane yield test Soil outflow prevention test unit g/m ² Mass parts Mass parts Example 8 500 100 1 ◎ ○ △ Comparative example 2 500 100 0 ◎ × △ Comparative example 3 500 0 3 ◎ ○ × The unit of the spreading amount of the soil outflow prevention material is g/m ² (calculated as solid content). The unit of the PVA aqueous solution is parts by mass (in terms of solid content). The amount of humic acid used is relative to 100 parts by mass (solid content) of PVA (in terms of solid content).

According to the experimental example, the following can be confirmed. The present embodiment containing emulsion and humic acid can increase the yield of crops (comparison of Examples 1-7 or Example 9 with Comparative Example 1 or Comparative Example 4). Adding emulsion and humic acid and using PVA will increase the workability and improve the effect of preventing soil outflow (comparison of Examples 1 to 6 and Example 7). By making the use amount of the soil outflow prevention material 300~1000g/m ² , the effect will increase (comparison of Examples 1 to 4 and Examples 5 to 6). In this embodiment containing polyvinyl alcohol and humic acid, the yield of crops will increase and it has the effect of preventing soil outflow (comparison of Example 8 and Comparative Examples 2 to 3). In this embodiment, by using humic acid with a jet black index of 1.5 to 3.0, an excellent effect can be achieved. [Industrial Utilization]

This embodiment can increase the yield of crops. This embodiment can provide a plant growth promoting effect, excellent water resistance, inhibit soil outflow, and promote permeable soil outflow prevention materials. This embodiment can be applied to the prevention of soil outflow in cultivated land or the prevention of soil outflow in green land where the grass is not rectified. According to this embodiment, it is possible to promote the growth of cultivated crops, increase production (harvest yield), and increase the production willingness of farmers, prevent soil outflow, and reduce the burden on the environment. When the soil of this embodiment is red soil, it has an excellent effect. The soil outflow preventing material of this embodiment can not only prevent the outflow of soil, but also improve the productivity of agricultural crops.

This application claims priority based on Japanese application Japanese Patent Application No. 2019-062166 filed on March 28, 2019, and its entire contents are incorporated into the present invention.

1: precipitation 2,2A: Outflow water 3: Measuring tool 4: soil 11: Field

Figure 1 is a schematic cross-sectional view of a field where the experiment of the present invention has been implemented.

1: precipitation

2,2A: Outflow water

3: Measuring tool

4: soil

11: Field

Claims (9)

A soil outflow prevention material, containing: one or more emulsions in the group consisting of synthetic resin emulsion and biodegradable resin emulsion, and humic acid with a black index of 1.5 to 3.0. A soil outflow prevention material, which contains one or more emulsions in the group consisting of synthetic resin emulsions and biodegradable resin emulsions, polyvinyl alcohol, and humic acid with a jet black index of 1.5 to 3.0. Such as the soil outflow prevention material of claim 2, wherein the amount of polyvinyl alcohol used is solid relative to 100 parts by mass of the solid content of one or more emulsions in the group consisting of synthetic resin emulsions and biodegradable resin emulsions In terms of ingredients, it is 0.5 to 20 parts by mass. The soil outflow prevention material of any one of claims 1 to 3, wherein, relative to 100 parts by mass of the solid content of one or more emulsions in the group consisting of synthetic resin emulsions and biodegradable resin emulsions, humic acid The usage amount is 0.01~5 parts by mass in terms of solid content. A soil outflow prevention material that contains polyvinyl alcohol and humic acid with a jet black index of 1.5 to 3.0. For example, the soil outflow prevention material of claim 5, wherein the amount of humic acid used is 0.01-5 parts by mass relative to 100 parts by mass of the solid content of polyvinyl alcohol. For example, the soil outflow prevention material of claim 2, in which the solid content of the soil outflow prevention material is 100% by mass, the solid content of the emulsion is 80-98.5% by mass, and the content of polyvinyl alcohol is 0.3-20% by mass. The acid content is 0.005-8% by mass. A method for preventing soil outflow is to spread the soil outflow prevention material in any one of Claims 1, 2, 3, 5, 6, and 7 to the soil. For example, the soil outflow prevention method of claim 8, in which the amount of soil outflow prevention material used in the field is 200~5000g/m ² per 1 m ^{2 of} field and diluted with water.

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