JP2003009681A - Multilayered mulch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multilayered mulch capable of preventing growth of weeds through a mulch layer even if growing force of weeds is strong and sufficiently keeping growth preventing effect of weeds over a long period and further being laid and fixed on the ground without use of any pin and having good workability in laying. SOLUTION: This multilayered mulch 3 is obtained by arranging a sheet 4 having water permeability and action for preventing shooting out of plants in contact with the ground surface and placing granules 5 having weather resistance including stone, porcelain, glass, or slag on the sheet 4 and arranging a fiber layer 6 composed of inorganic fiber on the granules 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-layered mulch laid to prevent weeds from growing around roots of plantings, street trees, etc. planted in, for example, road medians. Regarding

[0002]

2. Description of the Related Art In recent years, for example, plantings have been planted in road medians and parks, roadside trees have been planted, vegetation has been planted in mountains,
Afforestation is promoted by planting trees. After planting, weeds grow around the roots of these plantings, and if left undisturbed, these weeds make it harder for the plant to be exposed to sunlight, and the nutrients of the soil are absorbed by the weeds. As a result, the growth of the planted matter is suppressed or it withers, so the undergrowth must be mowed regularly.

However, the cutting of undergrowth is a heavy labor, and it is difficult to carry out it sufficiently due to the recent lack of manpower and the aging of forestry and greenery workers. In addition, harvesting plantings planted in the medians of roads and weeds near roadside trees has become increasingly dangerous with the increase in traffic in recent years, and moreover, it is a work while sucking exhaust gas. Work tends to be delayed because of health problems.

[0004] As one of the methods for eliminating the need for mowing the undergrowth, it is also practiced to spray the herbicide to prevent the growth of the weed, but the herbicide has a short effective period and is effective against the weed. It is often harmful not only to plants, but also to the medians of roads and road trees, which is harmful to humans who pass by and when it is sprayed. There was the problem of polluting the car.
There is also a problem that if the sprayed herbicide is mixed with groundwater or the like, it may have an adverse effect on human health using water.

On the other hand, as another method for eliminating the need for the above-mentioned cutting work of the undergrowth, around the root of the plant,
A method of laying various mats and sheets called soil covers or mulching to prevent the growth of weeds is also widely known.

As the soil cover used for such a purpose, for example, those made of vegetable fibers such as straw, old tatami mat, Manila hemp, and palm have been used for a long time. Veneer boards, perforated plastic sheets, plastic fiber sheets, cardboard, etc. are also used.

[0007] However, the soil cover using plant fibers such as old tatami mats and straw has a high water absorption rate due to decay, and the thickness thereof gradually decreases due to the influence of rain, snow, etc., so that effect is obtained. It lasts only 1-2 years at most,
After that, there was a problem that the seeds of weeds that came flying started to sprout.

[0008] Veneer boards and the like are not water-permeable, and when covering the roots of plantings, the ground surface must be leveled, and if the covered area is large, the boards will be large. There was a problem that it became heavy and required manpower and machinery. Further, although a sheet having holes made of plastic has water permeability, weeds sprout from the holes. Also, a sheet made of plastic fiber is water permeable and relatively impenetrable to weeds, but it takes time and effort to use a pin to stop this sheet on the ground surface. However, it has a problem that it is difficult to clean up because it is weak against ultraviolet rays and it does not decay and disappear.

Particularly, the pins for fixing these sheets on the ground surface are made of metal such as iron and stainless steel, or made of plastic, and U-shaped, T-shaped and U-shaped pins are used. However, this pin has a problem that it may damage the underground cable etc. when laying it, and in particular, various cables such as communication lines are often buried in the separation belt of the highway, etc. Cannot be used.

Also, the cardboard loses its strength when wet,
Further, if there is snowfall, the weight of the snow may cause it to break, so that the growth prevention effect of weeds can only last for 1 to 2 years, resulting in a short life.

Furthermore, flammable soil covers such as straw, old tatami mats, and veneer boards may cause a fire due to, for example, throwing away cigarettes.

In order to solve the above-mentioned problems, the applicant of the present invention has disclosed, as Japanese Patent Laid-Open No. 9-140273, a first fiber layer having a density of 150 kg / m ³ or more and a thickness of 0.3 mm or more, which is in contact with the ground surface. At least one layer of the second fiber layer having a density of 100 kg / m ³ or less is laminated on the upper surface of the first fiber layer to prevent the weeds having strong growth ability from penetrating and growing, Proposal of a soil cover that can sufficiently maintain the growth prevention effect for a long period of time and protect plantings from dryness of the soil due to winter cold, summer heat, and sunlight irradiation is doing.

The applicant of the present invention has also filed Japanese Patent Application Laid-Open No. 9-14027.
No. 4 has an areal density of 300 to 10,000 g / m ² ,
In addition, the upper surface of the fiber layer having a density of 200 kg / m ³ or less can be covered with a skin material to prevent even weeds with strong growth power from penetrating and growing upwards. We have proposed a soil cover that can prevent the fibers on the surface from peeling off and scattering even if the resin binder or the like of the fiber layer deteriorates.

[0014]

However, in the technique of Japanese Patent Laid-Open No. 9-140273, it is necessary to apply the second fiber layer after applying the first fiber layer which is in contact with the ground surface during the application. However, at this time, since the first fiber layer is light, the first fiber layer is easily blown by the wind, resulting in poor workability.

On the other hand, in the technique disclosed in JP-A-9-140274, since the water-permeable skin material is the outermost layer, the skin material is exposed to direct sunlight or the like.
For this reason, there is a problem in that it is limited to non-woven fabrics of inorganic fibers that are strong against ultraviolet rays. Further, there is a problem that it is necessary to use pins for laying and fixing.

Therefore, an object of the present invention is to prevent even weeds with strong growth power from penetrating through the multi-layer and to sufficiently maintain the growth prevention effect of weeds for a long period of time. It is also possible to provide a multi-layer mulch which can be installed and fixed on the ground without using a pin, is safe, and has good workability during installation.

[0017]

Means for Solving the Problems As a result of intensive studies aimed at achieving the above object, the present inventors have combined a sheet having a water permeability and a plant punch-through inhibiting action with a fiber layer comprising granules and inorganic fibers. By this, weed-proof property, weather resistance,
It was found that a multi-layer mulch having workability was obtained, and the present invention was completed.

That is, the multi-layered mulch of the present invention has a water permeability and a plant penetration inhibiting effect, and is a sheet placed in contact with the ground surface, and this sheet is placed on the ground surface on the sheet. It is characterized in that it is provided with a granular body having weather resistance and a fiber layer composed of inorganic fibers arranged on the granular body.

Thus, the above-mentioned sheet can prevent the growth of weeds from the ground surface, and since it has water permeability, it does not affect the growth of planting.

Further, since the particles having weather resistance are installed on the sheet, the sheet is not blown or floated at the time of construction, so that the sheet is excellent in workability and the particles are heavy. Safety is improved by eliminating the need to use pins when laying.

Furthermore, since a fiber layer made of inorganic fibers is provided on the surface of the multi-layered mulch, it is possible to prevent seeds and the like flying from the sky from germinating and growing. Further, since the fiber layer is an inorganic fiber, even if a cigarette or the like is thrown onto the multi-layer mulch, it is difficult to ignite due to the incombustibility of the fiber layer, and a fire can be prevented. in addition,
Since the inorganic fiber is a material that is unlikely to rot, it has weather resistance and can maintain the effect of preventing weed growth over a long period of time.

In a preferred embodiment of the present invention, the sheet is
Cloths, non-woven mats made of inorganic or organic fibers,
Or a sheet made of a resin spun bond or a mixture thereof, in which a smooth metal cone having a bottom diameter of 12 mm and a height of 90 mm and having a smooth surface is inserted with a load of 50 gr with the sheet periphery fixed. The penetration length (hereinafter, simply referred to as “penetration length”) is 50 mm or less. By using the sheet of this regulation, it is possible to impart grass-proof property without impairing water permeability.

It is also a preferred embodiment that the sheet is a mat containing wool as a main component and the penetrating length is 80 mm or less.

A further preferred aspect of the present invention is that the granules are at least one selected from stone, porcelain, glass and slag. Since these are materials having sufficient density and durability as particles for fixing the sheet, the effect of fixing the sheet is large. Also stones,
Since porcelain, glass, and slag are also industrial waste, they can be easily obtained and the cost can be reduced, and the recycling of the industrial waste can reduce the burden on the environment.

A further preferred aspect of the present invention is that the granules are adhered to the sheet. With this, since the particles are adhered to the sheet in advance, the number of laying steps can be reduced and the construction time can be shortened.

In a further preferred aspect of the present invention, the fiber layer has an areal density of 300 to 10,000 g / m ² and a density of 2
It is composed of an inorganic fiber of not more than 00 kg / m ³ . By defining the areal density and density of the fiber layer in the above range, while suppressing the growth of weeds from the ground by increasing the effect of blocking sunlight, high water permeability, small water retention, so on the multi-layer multi The seeds of the weeds that have come into contact with the seeds are prevented from germinating, and even if the seeds germinate, the surface is dried in a short time, so that the growth of the weeds can be suppressed. Moreover, since the heat insulation property is imparted by the fiber layer without impairing the water permeability, the growth of the plant can be promoted.

In a further preferred aspect of the present invention, the fiber layer and the granular layer are at least partially joined. This can prevent scattering of the fiber layer and scattering of particles.

[0028] In a further preferred aspect of the present invention, the fiber layer is formed by coating a mixture of rock wool with cement and water added. As a result, the durability and noncombustibility of the fiber layer are particularly enhanced, and the coating of the mixture containing cement and water can prevent rock wool from scattering.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION The embodiments of the present invention will be described below in more detail.

FIG. 1 shows a schematic structure of the multi-layer mulch of the present invention. That is, the plant 1 is planted in the soil 1, and the multi-layer mulch 3 according to the present invention is laid so as to cover the periphery of the root. The multi-layer mulch 3 has a water-permeable sheet 4 covering the surface of the soil 1 (hereinafter referred to as “ground surface”), and weather resistance installed on the sheet 4 for fixing the sheet 4 to the ground surface. The granules 5 and the fiber layer 6 made of inorganic fibers arranged on the granules 5 are provided.

First, the sheet 4 placed in contact with the ground surface
Will be described. In the sheet 4, the growth point of the weeds hits the fiber layer and the growth is inhibited. Even if the tip invades the fiber layer, the resistance of the fiber layer inhibits the hypertrophy of the branches and leaves and the weed penetrates upward. It has the function of preventing it from stretching.

The sheet 4 is not particularly limited as long as the above requirements are satisfied, but includes a sheet having a hole in a resin film, a sheet using synthetic fibers, animal and vegetable fibers, etc., and a cloth made of inorganic or organic fibers. , A non-woven mat, a resin spun bond, or a sheet made of a mixture thereof is preferably used, and these have a penetration length of 50 m.
Those of m or less are suitable. Particularly, if the penetrating length is 20 mm or less, the growth of weeds such as Japanese pampas grass that can easily penetrate can be stopped.

The mat containing wool as a main component is preferably used from the viewpoint that waste wool can be used and waste can be reused. Further, since it is a natural ingredient, it is environmentally preferable. . Wool-based sheets are
Although the reason is not clear, even if the penetration resistance is not so large, for example, if the penetration length is 80 mm or less, it has an effect of stopping the growth of weeds. In this case, the growth of even weeds such as Japanese pampas grass that can easily penetrate can be stopped particularly when the penetration length is 30 mm or less.

The penetration length referred to in the present invention is, as shown in FIG. 2, a bottom diameter a of 12 mm and a height h of 90.
It means a value measured by the following method using a metal cone 11 having a smooth surface of mm and an experimental apparatus as shown in FIG. In FIG. 3, reference numeral 12 is a platform scale, on which a frame-shaped holder 14 is arranged via a cylindrical body 13. Then, the periphery of the sheet 15 to be tested is sandwiched between the holders 14 and fixed with bolts and nuts.
4 is placed on the upper edge of the cylindrical body 13, the metal cone 11 is inserted into the seat 15, and the load applied to the seat 11 is 50
When the gr is reached (the scale of the platform scale 12 is raised by 50 g), the insertion depth indicated by the length b in FIG. 3 is measured. Then, the insertion depth was measured at several points by changing the place with respect to the sheet 15, and the values were averaged to obtain the penetration length of the present invention. The shorter this penetration length, the higher the penetration resistance.

When the penetrating length is within the above range, even if the growth points of weeds invade the fiber layer, the resistance of the fiber layer inhibits the hypertrophy of the branches and leaves so that the fiber layer cannot penetrate. The lower limit of the penetration length is not particularly limited, but generally, as the penetration resistance is increased, the flexibility is reduced and it becomes difficult to adapt to the ground, and not only the water permeability is decreased, but also the price tends to increase, The optimum penetration length may be determined in consideration of these factors.

Here, as the material of the sheet made of inorganic or organic fibers, natural fibers such as hemp, synthetic fibers such as polyester fibers, and inorganic long fibers such as glass fibers can be used. These are formed into a sheet as a woven fabric, a braided fabric or a non-woven fabric. These sheets preferably have an areal density (area weight) of 20 to 100 g / m ² . If the surface density is less than 20 g / m ² , it is not preferable because the strength when hydrated becomes weak and the sheet is easily cut.
When it exceeds g / m ² , it is not preferable because it does not fit the unevenness of the ground surface and a gap is easily formed, and the wind easily blows up during laying.

When the sheet is a non-woven fabric or a spun bond, as its material, various conventionally known non-woven fabrics such as natural fiber such as hemp, synthetic fiber such as polyester fiber, inorganic fiber such as glass fiber and rock wool can be used. I can mention
Of these, propylene fibers, which are excellent in weather resistance and incombustibility, are preferable as the synthetic fibers.

As a method for producing a non-woven fabric, there are a spun bond method, a method of binding with a binder, a needle punch method, a stitch bond method and the like. Among them, it is preferable to use the spun bond method. When adopting a method of applying a resin binder, it is preferable to select a resin binder that is resistant to decay and safe for planting, for example, vinyl acetate emulsion, acrylic resin emulsion, epoxy system, It is preferable to use an olefin-based or urethane-based polymer emulsion, a rubber latex, an asphalt-based emulsion, starch or the like. In addition, the amount of the resin binder used is preferably as small as possible within a range in which the fiber can be formed into a sheet.

Next, the grain 5 having weather resistance used in the present invention
Will be described. In the present invention, weather resistant particles are provided on the sheet. This has the effect of pressing a relatively lightweight sheet with the weight of the granules and making it difficult for the sheet to be blown by the wind. In addition, this makes it possible to simply lay the particles on the sheet, which saves the trouble of driving the pins for fixing the multi-layer multi one by one, and also makes it easier for the sheet to move due to the wind while driving the pins. It is possible to improve workability. In addition, since it is possible to provide a layer of granules in the middle and a heat insulating layer is formed, it is possible to suppress the rise in soil temperature due to direct sunlight in the summer, and protect the planting from frost damage in winter. It can also exert the effect of being able to.

The material of the granules is not particularly limited,
Preferably, the particles are any one selected from at least one of stone, porcelain, glass and slag, and stone is particularly preferably used from the viewpoint of cost and weather resistance. Also,
Stone, porcelain, glass and slag are also industrial waste, so
It is easy to obtain and the cost can be reduced, and the industrial waste can be reduced by using it.

The granules are preferably placed evenly so as to have a weight of 3 to 20 kg / m ² . When it is 3 kg / m ² or less, the sheet does not follow the unevenness of the ground and creates a gap between the sheet and the ground surface, and is easily blown by the wind, which is not preferable because the workability is not improved. If it is heavier than / m ² , the cost is high, and when the sheet and the granules are bonded together, handling by hand becomes difficult, which is not preferable.

The size of the highly weather-resistant granules is 2 in average diameter.
0 mm or less is suitable, and 5 to 10 mm is preferable. Two
If it exceeds 0 mm, the fiber layer formed thereon tends to have irregularities or cracks, which is not preferable.

As a method for installing the granules, the sheet may be laid and then the granules may be sprinkled on the sheet, or the granules may be previously bonded to the sheet with an adhesive or the like. However, the latter method is preferable because it can reduce the number of laying steps, shorten the construction time, and prevent the sheet from being blown by the wind, thereby improving the safety of construction. In this case, as the adhesive, hot melt mainly composed of vinyl acetate resin can be preferably used.

Next, the fiber layer 6 used in the present invention will be described. In the present invention, since the fiber layer is the outermost surface and is exposed to wind and rain or direct sunlight, it is necessary to have weather resistance, it is nonflammable, and it is important that it contains an inorganic fiber from the viewpoint of being resistant to decay. is there. As the inorganic fiber, inorganic fiber such as rock wool, glass wool, glass fiber, carbon fiber, metal fiber, ceramic fiber or the like can be used, and rock ool is particularly preferable from the viewpoint of low cost. These can be used alone or in combination, and it is also possible to include substances other than inorganic fibers such as organic fibers and animal / vegetable fibers.

The average diameter of the inorganic fibers is 1 to 12
It is preferably set to μm. If the average fiber diameter is less than 1 μm, the cost will be high, which is not preferable, and if it exceeds 12 μm, the skin will be strongly stimulated during the work, which is not preferable.

In the present invention, the fiber layer has an areal density of 300.
It is preferable that the density is 10000 g / m ² and the density is 200 kg / m ³ or less. And the surface density of 300 g / m ² less than, the light shielding property is lowered easily come out buds weeds from the ground, it is not preferable because growth prevention effect of the weed can not be sufficiently obtained, and when it exceeds 10000 g / m ² However, the multi-layered mulch becomes too thick, the handling property deteriorates, the workability deteriorates, and the cost increases, which is not preferable. On the other hand, if the density exceeds 200 kg / m ³ , the water permeability becomes poor and the amount of water retained in the fiber layer increases, so that the seeds of flying weeds germinate and grow easily, which is not preferable.

In the present invention, it is preferable to add a binder to the inorganic fiber layer so that the inorganic fiber layer is fixed so that the fibers do not scatter. As the binder, it is preferable to select one that is resistant to decay and safe for plants, for example,
Thermosetting resin such as phenol resin, vinyl acetate emulsion, acrylic resin emulsion, epoxy-based, olefin-based, urethane-based polymer emulsion, rubber latex, asphalt emulsion, cement and the like can be used, but among them, cement is used. Is particularly preferred. In addition, it is preferable to add 10 to 100 parts by mass as a solid content to 100 parts by mass of the inorganic fiber. Furthermore, in addition to facilitating the bonding of the fibers to each other, the binder preferably bonds the layer of the granules and the fiber layer, thereby preventing the layer of the granules from peeling off from the fiber layer and the particles of the intermediate layer. It is also possible to prevent body scattering.

As a method for installing the fiber layer on the sheet and the granules, a mixture of fibers and a binder is directly sprayed or evenly placed on the sheet and the granules at a local construction site. A method of solidifying is preferably adopted.

When cement is used as a binder, fibers and cement are mixed and water is added in advance before the resulting mixture is placed on the granules, or the mixture is placed on the granules. A method in which water is added and then cured is preferably adopted.

[0050]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 A polypropylene resin sheet having an areal density of 68 g / m ² and a penetration length of 0 mm (spunbond nonwoven fabric manufactured by DuPont, trade name Zaburn) was previously provided with 10 pieces of gravel having an average diameter of about 5 mm.
Adhere with vinyl acetate adhesive so that it becomes kg / m ² ,
A sheet used for the multi-layer mulch of the present invention was obtained.

On the above-mentioned sheet, rock wool fine cotton 16
5 kg / m of a mixture of Portland cement (4 kg by weight) (Asahi Fiberglass, trade name: Mulching Blow) and 2 kg of water
² was applied uniformly to form a fiber layer, and the surface was strongly suppressed with a trowel to obtain a multi-layer mulch of the present invention.

Example 2 Australian areal density 300 g / m ² , penetration length 3
7k of gravel with an average diameter of 5mm is preliminarily placed on an 8mm coarse blanket.
It was adhered with a vinyl acetate adhesive so as to be g / m ² , to obtain a sheet used for the multilayer mulch of the present invention.

On the above-mentioned sheet, rock wool fine cotton 16
5 kg / m of a mixture of Portland cement (4 kg by weight) (Asahi Fiberglass, trade name: Mulching Blow) and 2 kg of water
² was applied uniformly to form a fiber layer, and the surface was strongly suppressed with a trowel to obtain a multi-layer mulch of the present invention.

Example 3 To a blanket having an areal density of 300 g / m ² and a penetrating length of 35 mm, glass particles having an average diameter of 8 mm were preliminarily adhered with a vinyl acetate adhesive so as to be 10 kg / m ^2, and the multilayer multi-layer of the present invention. The sheet used for was obtained.

On the above-mentioned sheet, rock wool fine cotton 16
5 kg / m of a mixture of Portland cement (4 kg by weight) (Asahi Fiberglass, trade name: Mulching Blow) and 2 kg of water
² was applied uniformly to form a fiber layer, and the surface was strongly suppressed with a trowel to obtain a multi-layer mulch of the present invention.

Comparative Example 1 A polypropylene wool non-woven sheet having a surface density of 68 g / m ² and a penetrating length of 0 mm (spunbond non-woven fabric manufactured by DuPont Co., Ltd., Zavern) was placed on rock wool fine-grained cotton 16 k.
Mixture of 4kg by weight of Portland cement added to g (Asahi Fiberglass, trade name Mulching Blow)
2 kg of water and lightly kneaded were uniformly applied at 5 kg / m ² to form a fiber layer, and the surface was strongly suppressed with a trowel to obtain a multilayer mulch of Comparative Example 1.

Comparative Example 2 A mixture of 16 kg of rock wool fine-grain cotton and 4 kg of Portland cement in a weight ratio (made by Asahi Fiber Glass,
Comparative example 2 in which 2 kg of water was added to a product name mulching blow) and lightly kneaded was uniformly applied at 5 kg / m ² to form a fiber layer, and the surface was strongly suppressed with a trowel to form only the fiber layer.
Got a multi.

Comparative Example 3 A mulch of Comparative Example 3 was obtained by laying only a polypropylene resin non-woven sheet having a surface density of 68 g / m ² and a penetration length of 0 mm (Spunbonded non-woven fabric manufactured by DuPont, trade name Zaburn).

Test Example 1 A total of 50 m ² of the multi-layer mulch of Example 1 and Comparative Example 1 was applied in a state in which a wind of about 3 m / sec was blown on a flat ground where Japanese pampas grass, mugwort, etc. grew, and the workability of both was improved. Compared.

As a result, in Example 1, there was no particular hindrance to the construction and the workability was good.
m ² (50m ² per, meaning that it took 1 hour by two people,
The same shall apply hereinafter). On the other hand, in Comparative Example 1, it is difficult for the sheet to flutter in the wind and to be fixed to the ground surface,
It is necessary to arrange 4 people around the seat,
The workability was poor, requiring man-hours / 50 m ² .

Test Example 2 A Wagner pot, which is a container for a crop cultivation test, is prepared, and strains of Japanese pampas grass, Todashiba, Astragalus membranaceus, and mugwort are planted. 3 mulches were laid on each, and 15 g of tall fescue turf seeds were sprinkled on top of it with 300 g of dry black soil, and 80 g of starch paste (Yamatonori for office work) was mixed with 5 kg of water in order to stop the scattering of seeds. , 700 g / sprayed.

Then, the number of leaves extending through the mulch layer and the state of germination from the surface of the mulch layer were examined after leaving this for 2 months while irrigating it in a greenhouse. The results are shown in Table 1.

[0064]

[Table 1]

From Table 1, in Examples 1 to 3 of the present invention, the germination rate was 5% or less in all, and there were no weeds penetrating the multi-layers, and the multi-layered mulch of the present invention had excellent weed control properties. You can see that

On the other hand, in Comparative Example 2, the germination rate was 20.
%, And the Japanese pampas grass penetrates the multi-layer, indicating that the weed-proof property is poor only with the fiber layer. Further, even with the spunbonded non-woven fabric of Comparative Example 3, the germination rate was as high as 70%, and since only the non-woven fabric was light, weeds pushed up the sheet and extended through the gaps, which also shows that the weed control property is poor.

[0067]

As described above, according to the multi-layer mulch of the present invention, a sheet having water permeability and a plant penetration inhibiting effect, which is placed in contact with the ground surface, and the sheet on the sheet are provided. Since the provided granular material having weather resistance and the fiber layer made of inorganic fibers arranged on the granular material are provided, it is possible to suppress germination of flying seeds while maintaining water permeability, and a multi-layer. It is possible to prevent the growth of weeds that penetrate through and grow. Moreover, the presence of the particles improves the heat insulating effect, and since the particles overlap to eliminate the need for pins for fixing the mulch material, it is possible to provide a multilayer mulch that is safe and has excellent workability.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a schematic structure of a multi-layer mulch according to the present invention.

FIG. 2 is a side view showing the shape of a metal cone for measuring the penetration length.

FIG. 3 is an explanatory view showing an experimental device for measuring a penetration length.

[Explanation of symbols]

1 ground 2 planting 3 multi-layered multi 4 Water-permeable sheet 5 grains 6 fiber layers

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshiro Tezuka             13-12 Iwamotocho, Chiyoda-ku, Tokyo             Hongo Fertilizer Co., Ltd. (72) Inventor Masahiko Ikeda             3-6-3 Kanda Blacksmith Town, Chiyoda-ku, Tokyo               Asahi Fiber Glass Co., Ltd. F-term (reference) 2B024 DB03 DB04 DB07 DB10                 4F100 AA00A AA00C AC06B AC10C                       AE01C AG00B AJ08A AK01A                       AT00A BA03 BA07 BA10A                       BA10C DE01B DG01C DG06A                       DG11A DG15A GB01 JD04A                       JL09B YY00C

Claims (8)

[Claims] 1. A sheet which is water-permeable and has a plant penetration inhibiting effect and which is arranged in contact with the ground surface,
A multi-layer mulch characterized by comprising weather-resistant granules placed on the sheet, and a fiber layer containing inorganic fibers arranged on the granules. 2. The sheet is made of a cloth, a non-woven mat, a resin spun bond, or a mixture thereof made of an inorganic or organic fiber, and has a bottom side diameter of 12 mm and a height of 90 mm with the sheet periphery fixed. The penetration length is 5 when a smooth metal cone is inserted with a load of 50 gr.
The multi-layer mulch according to claim 1, which is 0 mm or less. 3. The sheet is a mat whose main component is wool, and has a bottom diameter of 1 with the periphery of the sheet fixed.
50 mm of smooth metal cone with a surface of 2 mm and height of 90 mm
The multi-layer mulch according to claim 1, wherein the penetration length when inserted with a load of gr is 80 mm or less. 4. The multi-layer mulch according to claim 1, wherein the granules are selected from at least one of stone, porcelain, glass and slag. 5. The multi-layered mulch according to claim 1, wherein the granules are adhered to the sheet. 6. The areal density of the fiber layer is 300 to 1000.
The multi-layer mulch according to any one of claims 1 to 5, which is composed of an inorganic fiber having a density of 0 g / m ² and a density of 200 kg / m ³ or less. 7. The multi-layer mulch according to claim 1, wherein the fiber layer and the granular layer are at least partially bonded. 8. The multi-layer mulch according to claim 1, wherein the fiber layer is formed by coating rock wool with a mixture of cement and water.