JP2002017170A - Planting container for culturing mat and greening method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide planting containers for mat culture, capable of arranging these containers in mosaic state in a state in which a lightweight and thin type culturing containers are put and embedding the containers when plants to be planted for greening artificial ground or slop of rooftop, wall surface, etc., are transplanted and a greening method using the above planting containers. SOLUTION: The planting containers 1 for mat culturing are characterized in that the material is composed of a plastic having biodegradability and discharge holes are formed in the bottom parts and these containers are formed in a depth of about 0.5-2.0 cm independently of the area of openings and these containers are laid in entirely mosaic state or in a mosaic state separated in desired prescribed intervals. This greening method in the present invention is characterized by packing culture soil 5 in planting containers 1 for mat culture, sowing seeds or planting seedlings into the culture soil 5 and growing the seeds or seedlings, embedding all of containers in the ground in a state in which plants 3 to be planted are put when plants 3 to be planted are transplanted and greening the rooftop or the slope by growing the plants 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic plant whose material is biodegradable, and a planting container for mat cultivation used for planting roofs of buildings such as factories and high-rise houses, verandas and decks, and this container. The present invention relates to a greening method using the method.

[0002]

2. Description of the Related Art Greening of artificial ground such as rooftops and walls of buildings has recently become an important factor in urban greening space formation due to the rise and denseness of urban structures. It greatly contributes to the prevention of global warming, such as the prevention of global warming and the mitigation of the heat island phenomenon, and is recognized as an essential condition for the formation of a living environment including landscapes.

Most of the conventional rooftop greening methods are such that plants on the ground surface can be cultivated even on the rooftop. For example, Japanese Patent Publication No. 40-1121 discloses a corrosion resistant material having water retention on artificial ground. Laying a sponge-like piece made of a synthetic resin, laminating a mixed layer of Kanuma soil and perlite on the upper part, laminating the soil on the upper part, it is possible to plant seeds or seedlings and grow plants. It is disclosed that water can be smoothly supplied from a sponge and root rot of a plant can be prevented.

In Japanese Patent Publication No. 51-21895, a mixture of inorganic fiber such as rock wool and an adhesive is sprayed on a surface of a roof construction to form an inorganic fiber layer having a predetermined thickness. A spray layer is formed by spraying a mixture of seeds or spores and an adhesive on the surface, and the seeds or spores can be germinated. It is stated that the plant can be supplied and germinated and grown, so that greening in a living environment can be easily and effectively promoted, and a heat insulating effect can be given to a structure such as a roof or a wall of a factory, for example.

[0005] On the other hand, cultivation vessels are used for cultivating plant seedlings in rooftop and slope revegetation methods, but these are not biodegradable from the viewpoint of ease of handling and price. Most are made of plastics such as vinyl chloride and polyethylene. Recently, as such a planting container, for example, a cultivation container (JP-A-54-112453) produced using a copolymer composed of an aliphatic polyester and an aliphatic polyamide, and plant fibers such as paper typified by used paper A variety of cultivation containers have been proposed, such as a cultivation container (JP-A-2-28613) in which a film of a polyhydroxybutyric acid / polyhydroxyvaleric acid copolymer is formed on the surface of a pot to form a composite.

[0006]

However, in the conventional plastic planting container, since the peripheral wall is not air permeable and water containing nutrients cannot pass freely, the soil condition between the inside and the outside isolated by the container peripheral wall is not sufficient. The roots of the plant break through the surrounding wall, because the container material does not match, or the material of the container inhibits the rooting of the root, or because dew condensation occurs between the inner surface of the planting container and the internal cultivation It does not protrude freely and causes a root turning phenomenon in the container. For this reason, the number of roots in the container is large and thick. Since the seedlings of the plant absorb water and nutrients from the main roots, the number of fine roots is reduced and root growth is poor, there is a problem that planting is not excellent, and rooting failure is likely to occur at the time of transplantation .

[0007] In particular, when growing using a synthetic resin planting container, excess water that has been irrigated is discharged to the outside through a drain hole at the bottom, but the direct root is perpendicular to the bottom surface. Extending through the drainage hole, and branch roots and fine roots branch off from the direct root, so that roots that have penetrated the drainage hole are tightened and root growth after transplantation is prevented, so that root growth is not hindered It is necessary to remove the container from the container at the time of transplantation and replace it from the viewpoint of promoting environmental protection and environmental conservation, and it is complicated, and many branch roots and fine roots including direct roots are cut off at the time of transplantation (planting). Therefore, there is a problem that poor rooting after implantation and deterioration of root survival are likely to occur. In addition, there is a problem that the used container becomes an industrial waste, and there is also a problem that toxic gas is generated when incinerated, or the incinerator itself may be damaged.

Cultivation containers made from plant fibers such as sawdust and waste paper have too high water absorption, low water resistance and poor shape retention, and contain biodegradation inhibitors such as lignin. However, there are drawbacks such as remaining long after being buried without being decomposed and adversely affecting root growth (rooting).

[0009] On the other hand, for example, when a plant that grows to cover the ground surface is used for greening for rooftop greening, taking a lawn as an example, a lawn seed may be sown at the planting site. To remove the lawn grown in the open field and cut it to an appropriate size to block it, take it out of the container, cut off the root and adjust the length of the root as shown by the arrow in FIG. It is common to plant side by side with appropriate spacing. Therefore, not only the growing roots but also the direct roots are cut off because not only the growing roots but also the growing roots extending along with the lawn growth extend radially and are intertwined with each other in a complicated manner (roots). Cuts), and the growth points of each root die off,
Since the function as a root is remarkably hindered, there has been a problem that poor rooting after implantation and deterioration of root survival are likely to occur.

In the conventional method of greening a roof or slope, even if a biodegradable planting container is used, as shown in FIG. However, there is a problem that the upper end of the peripheral wall on the ground remains without being biodegraded because the container is not fully filled and the entire container is not buried underground.

The present invention has been devised in view of the above situation, and its purpose is to transplant a plant for greening an artificial ground or a slope such as a rooftop or a wall surface. All of them can be buried in a mosaic-like arrangement in a light and thin cultivation container, allowing for continuous generational change, and excellent spread and growth of plants after transplantation, air purification, drying prevention, and global warming. To provide a planting container for mat cultivation that can greatly improve the living environment, including the landscape, and a greening method that uses this planting container. It is.

[0012]

The gist of the means adopted by the invention of each claim to achieve the above-mentioned object is as described in the above-mentioned claims.

[0013] That is, according to the first aspect of the present invention, the material is a biodegradable plastic, which has a drainage hole on the bottom surface,
After filling a culture soil in a planting container for mat cultivation having a depth of about 0.5 to 2.0 cm irrespective of the area of the opening, sowing or seedling seeding in the culture soil and raising the plant, When transplanting the plant, by arranging all the containers in the ground in a mosaic shape or a mosaic shape separated by a desired predetermined interval while being contained in the planting container, by cultivating the planting material The main point is a greening method for rooftop greening or slope greening.

According to a second aspect of the present invention, in the first aspect, the plastic is mainly composed of polylactic acid.

According to a third aspect of the present invention, in the first or second aspect, the plastic is a foam.

The planting container for mat cultivation according to the present invention is, in particular, the thickness of the container and the area of the opening (vertical and horizontal dimensions and shape).
Irrespective of this, since it has a structural characteristic in a place where the depth is formed to about 0.5 to 2.0 cm, by adopting such a configuration (technical idea), an expensive culture soil can be obtained. Can be reduced, and when transplanting a plant, all the containers can be buried in the ground by arranging them in a mosaic shape with the entire surface or in a mosaic shape separated by a desired predetermined interval while being held in the planting container. is there.

According to a fourth aspect of the present invention, when transplanting a plant, all the containers are buried in the ground while being held in the planting container, and all the containers are buried in the ground. A planting container used for greening rooftops or slopes by cultivating a material, which is made of biodegradable plastic, has a drainage hole on the bottom part, and has a depth regardless of its size and shape. The purpose of the present invention is to provide a planting container for mat cultivation, which is formed to be 0.5 to 2.0 cm or less and which can be buried side by side in a mosaic shape or a mosaic shape separated by a predetermined interval.

In a fifth aspect of the present invention, in the invention of the fourth aspect, the plastic is a planting container for mat cultivation in which polylactic acid is a main component.

According to a sixth aspect of the present invention, the gist of the fourth or fifth aspect is a planting container for mat cultivation wherein the plastic is a foam.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail, but only typical ones are shown, and various design changes can be made without departing from the gist of the present invention.

First, as a suitable plant to be used for rooftop or slope revegetation, native perennials are used in several combinations, but a combination of pastures and herbs, mainly sedums, is used. It is preferable from the viewpoint of weight reduction. For example, for rooftop greening, a combination of European mannen, kossinium, sakasa mannen, giraffe, tight sesame, Mexican mannen, and the like is preferable. In addition, grass, tamaryu, water moss, turf cherry, hedera, bamboo grass, etc. may be used as the plant.

The planting container for mat cultivation according to the present invention is obtained by injection-molding a biodegradable plastic.
It can be manufactured by vacuum forming a biodegradable plastic sheet or foam board, or by using various other conventionally known plastic processing techniques. In addition,
The plastic having biodegradability is not particularly limited, and various types can be used. However, only preferred examples of the biodegradable plastic are polylactic acid, aliphatic polyester, and starch.

First, as polylactic acid, D-lactic acid and L-lactic acid are used.
Various polylactic acids such as a homopolymer of an optical isomer formed by lactic acid or a blend thereof, and a heteropolymer including a copolymer of an optical isomer formed by a blend of D-lactic acid and L-lactic acid or a blend thereof are exemplified. By changing the ratio (D / L ratio) of monomer units derived from D-lactic acid and L-lactic acid, the crystallinity and melting point can be freely adjusted. The glass transition temperature of the homopolylactic acid polymer is almost independent of the D / L ratio when the molecular weight is large, and is approximately 55 to 65.
° C, generally around 60 ° C.

Examples of the biodegradable aliphatic polyester include polyhydric alcohols such as ethylene glycol, diethylene glycol, triethylene glycol and propylene glycol, and phthalic anhydride, fumaric acid, succinic acid, and the like.
Examples thereof include double conjugates with polybasic acids such as adipic acid and other dicarboxylic acids; polylactones such as poly (ε-caprolactone); copolymers with lactones containing lactones and glycosides, and the like. The preferred number average molecular weight of the aliphatic polyester is in the range of 30,000 to 1,000,000. If the average molecular weight is 30,000 or less, the mechanical properties of the molded article are poor. ,
The melting temperature is too high and molding tends to be difficult. In addition,
If the glass transition temperature of the aliphatic polyester is higher than 120 ° C., it is difficult to improve the impact resistance.

For example, an aliphatic polyester blended with polylactic acid is polycaprolactone (ε-caprolactone)
Where the number average molecular weight of the polycaprolactone is
It is preferably in the range of 1,000 to 200,000. The number average molecular weight of polycaprolactone is 200,00
Although it may be larger than 0, it is generally difficult to produce such polycaprolactone, and it is not realistic. Further, as polycaprolactone, other than a homopolymer of ε-caprolactone, 4-methylcaprolactone, various methylated caprolactones such as 3,5,5-trimethylcaprolactone, β-propiolactone, γ-butyrolactone, δ-valerolactone, It is also possible to use a homopolymer of an enantract, a copolymer of two or more of these monomers, or a homopolymer or a copolymer thereof.

The biodegradable aliphatic polyester is 300 parts by weight or less, preferably 4 parts by weight, per 100 parts by weight of polylactic acid.
The compound can be compounded at a ratio of 0 to 240 parts by weight. For example, in the case of polycaprolactone, polylactic acid 100
When blended at a ratio of 100 parts by weight or less, more preferably 40 to 90 parts by weight with respect to 100 parts by weight of polylactic acid, it has biodegradability that enables natural circulation type recycling and mechanical strength characteristics And a biodegradable cultivation container having more excellent weather resistance can be obtained. If the blending ratio of the aliphatic polyester is too large, the structure becomes non-uniform, and the thickness of the sheet material does not become uniform, which tends to cause problems such as uneven thickness or cracks in the molded product when pulled. is there.

Also, the starch may be compounded in a proportion of 100 parts by weight or less, preferably 65 parts by weight or less, based on 100 parts by weight of the polylactic acid. If 100 parts by weight or more of starch is blended with respect to 100 parts by weight of polylactic acid, sheet moldability and the like tend to be inferior. Starch to be added may include raw starch, processed starch and mixtures thereof. As raw starch, corn starch, potato starch,
There are sweet potato starch, wheat starch, rice starch, cassava starch, sago starch, tapioca starch, kuzu starch, legume starch, etc.
Examples of the modified starch include physically modified starch such as α-starch, fractionated amylose, wet heat-treated starch, chemically degraded starch such as acid-treated starch, esterified starch, etherified starch, cationized starch, and cross-linked starch. As the esterified starch, there are acetate-starch, succinate-starch, nitrate-starch, phosphate-starch, urea-phosphate-starch, xanthogen-starch, aceto-acetate-starch, and the like. Examples of the etherified starch include allyl etherified starch, methyl etherified starch, carboxymethyl etherified starch, and hydroxyethyl etherified starch. Examples of the cationized starch include a reaction product of starch and 2-diethylaminoethyl chloride, and examples of the crosslinked starch include formaldehyde crosslinked starch, phosphoric acid crosslinked starch, and acrolein crosslinked starch.

For the preparation of the compound resin containing polylactic acid, aliphatic polyester or starch used in the present invention, a general kneading method can be preferably used. More specifically, they can be mixed by a Henschel mixer or a ribbon mixer, supplied to a known melt kneader such as a single-screw or twin-screw extruder, a Banbury mixer, a kneader, or a mixing roll, melt-kneaded and pelletized. Further, even when a liquid aliphatic ester resin or starch is blended, it can be kneaded and pelletized in the same manner.

By the way, the resin used for producing the planting container for mat cultivation of the present invention has a glass transition temperature not higher than the polylactic acid resin and a water content of 10 to 200 pp.
m, preferably 20 to 100 ppm. Similarly, when producing a sheet material or a foam sheet material for secondary molding, it is also preferable to dry at a low temperature. For example, the glass transition temperature is 65 ° C
When the polylactic acid resin is dried at about 40 ° C. for at least 5 to 6 hours, at 60 ° C. at least 1.3 hours.
It is necessary to perform low-temperature drying for about 5 hours. If the drying temperature is lower than 35 ° C., the drying state of the polylactic acid pellets becomes insufficient even after continuous drying for a long time (because the moisture content is too high). There is a tendency for streaks. When the drying temperature is 70 ° C. or higher, the polylactic acid pellets stick to each other in the hopper to form a lump, so that the resin cannot be fed or the sheet material or the foamed board is pulled and the molded body becomes hard and brittle. This causes a problem in impact resistance.

Next, a foaming agent, a lubricant and a nucleating agent are dry-blended with polylactic acid pellets dried at 45 to 60 ° C. for the polylactic acid foam having biodegradability. It is extruded and foamed into a long shape under conditions of 120 to 190 ° C. and die temperature of 110 to 170 ° C., and then subjected to a wave-removing process, pressed by a forming roll maintained at 50 ° C. or less, and continuously taken by a take-off device. It can be manufactured by drawing into a suitable length and cutting it to an appropriate length.

The polylactic acid resin has a water content of 10 to 20.
It is necessary to dry so as to be in the range of 0 ppm. When the water content is 10 ppm or less, a so-called “stain” tends to occur on the surface of the foam, and the water content is 2 ppm.
If the content is more than 00 ppm, bubbles and vertical streaks of moisture are formed in the extruded foam, and the foam itself tends to be brittle. When the water content of the polylactic acid is about 50 to 150 ppm, the surface can be formed into a clean flat surface. In particular, when the water content of the polylactic acid pellet is about 20 to 75 ppm,
A foam having an embossed surface shape can be molded with good reproducibility, and the embossed surface shape can be maintained even after secondary molding.

More specifically, the foaming agents include, as inorganic foaming agents, sodium bicarbonate, ammonium bicarbonate,
Examples thereof include ammonium carbonate, sodium borohydride, and azide compounds. Organic foaming agents include azo compounds represented by azodicarbonamide and azobisisobutyronitrile, sulfonyl hydrazide compounds represented by oxysbenzenesulfonyl hydrazide, and nitroso compounds represented by dinitrosopentamethylenetetramine , Etc. can be exemplified. These foaming agents may be used alone or in combination of two or more, but when an azo compound-based foaming agent is used, the cells are dense and have excellent elasticity and resilience. Can be produced and provided.

The mixing ratio of the foaming agent is 100
The ratio is 0.2 to 2.0 parts by weight, preferably 0.5 to 1.2 parts by weight based on parts by weight. It goes without saying that the amount of the foaming agent used is an amount necessary for obtaining a desired expansion ratio. The density of the obtained polylactic acid foam is
It is preferably 0.5 to 1.05 g / cm ³ . If the density is lower than 0.5 g / cm ³ , the foam content in the foam is too large, and the secondary processing moldability tends to decrease. If the density exceeds 1.05 g / cm ³ , the There are too few air bubbles in the body, and heat insulation and weight reduction do not appear sufficiently.

If necessary, inorganic substances such as calcium carbonate, magnesium carbonate, talc, silica, mica and calcined clay, plasticizers such as low molecular weight polycaprolactone, pigments such as carbon black, antioxidants, and improvement of weather resistance Agents and the like can be contained.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, each requirement described in the present embodiment, unless otherwise specified,
It is not intended to limit the scope of the present invention, but merely as an illustrative example.

FIG. 1 is an overall perspective view of a plant container for mat cultivation 1 according to an embodiment of the present invention. The plant container for mat cultivation 1 is formed by vacuum-forming a polylactic acid foam board. It was done.

The polylactic acid foam is obtained by mixing a mixed pellet obtained by mixing 20 parts by weight of regenerated “Lactron 700DA” with 100 parts by weight of a polylactic acid virgin pellet (trade name “Lactron 700DA”, purchased from Kanebo Gosen Co., Ltd.).
After drying at 60 ° C for 3.0 hours with a hot air dryer,
To 100 parts by weight of the obtained dried pellets, 0.8 parts by weight of "DS # 25") as a foaming agent and 0.5 parts by weight of talc as a nucleating agent were drive-blended, and the extrusion opening diameter was 130 parts.
At φ, a T-die 2 with a clearance of 0.9 mm was attached, extruded and foamed in a long shape at a cylinder temperature condition of 130 to 190 ° C. and a die temperature of 145 to 155 ° C., and subjected to a wave-removing process. It is processed into a plate-like foam board while being pressed by a cooling roll cooled to 35 ° C., further cooled by passing through a water tank, and continuously formed by a take-off device while being cooled by a plurality of cooling rolls, It was manufactured by cutting with a cutter. "DS # 25" is manufactured by Eiwa Chemical Co., Ltd. and is an azo compound-based composite foaming agent composed of azodicarbonamide and oxybisbenzenesulfonylhydrazide.

Next, a foam board having a thickness of 1.5 mm is formed by a vacuum forming method into a thin lunch box shape having a length of 15 cm, a width of 20 cm, and a depth of 0.8 cm. If two square holes (drainage holes) are drilled in each case, a planting container for mat cultivation according to one embodiment of the present invention can be manufactured.

Next, an embodiment of the greening method using the planting container 1 for mat cultivation will be described by way of example. However, this greening method is also merely an example.

A commercially available culture soil 5 is filled in the planting container 1 for mat cultivation, and lawn seeds are sown on the culture soil 5 and added until the culture soil 5 rises upward. Then, the seeds are covered with the culture soil 5. Then, the plants were irrigated daily and, if necessary, grew by applying a commercially available granular chemical fertilizer. The roots 4 of the lawn 3 branch and extend radially while holding the soil, and grow in a state in which they are intertwined with each other in a complicated manner (FIG. 1).

After growing to an appropriate size, for example, an artificial soil surface X provided on the roof of a high-rise building or a slope Y for greening is provided.
The whole plant is laid in a mosaic pattern or arranged in a mosaic pattern at a predetermined interval, and without cutting off the roots 4 of the plant 3 and without extracting the plant 3, the whole planting container 1 is completely removed. When buried (Fig. 2) and grown while repeating the supply of water necessary for growth, rooftop greening and slope greening can be performed.

Incidentally, as a result of tracking the collapse of the planting container 1 with time, two months after transplantation, the peripheral wall and the bottom surface of the planting container were partially collapsed to form innumerable small holes, and the main roots and branches were formed. The roots and the like extended into the surrounding soil through the hole (piercing the peripheral wall), and the growth of the lawn (plant) was good. In addition, 5 to 6 months after transplantation, the peripheral wall and the bottom surface of the planting container did not retain the original shape, and it was confirmed that the plant was completely biodegraded and that the growth of the lawn (plant) was good. .

[0043]

As described above, the planting container for mat cultivation according to the present invention is made of a biodegradable plastic material.
Regardless of the wall thickness, the vertical and horizontal dimensions and the shape of the opening, it has a structural characteristic in that it is formed in a thin dish shape with a depth of about 0.5 to 2.0 cm. ,
The cultivation container itself collapses and assimilate.

Since the planting container is shallow, expensive culture soil to be filled in the container can be largely saved, so that effects such as a significant reduction in plant production costs can be obtained.

Further, the roots of the plant are branched and extend radially while holding the soil, grow in a complicatedly entangled state, and the container itself is decomposed and assimilated by microorganisms. can do. That is, it is not necessary to take out from the container and replace it, for example, on a rooftop artificial ground or on a slope, it can be prepared in a mosaic shape or a mosaic shape separated by a predetermined interval as desired, and can be prepared in a band shape or a plate shape, and all underground as it is It can be buried in the roof, speeding up and standardizing the transplanting work on artificial rooftops and slopes, and enabling the emergence of dense ecosystems in strips or flat plates. It has a particularly remarkable action and effect with excellent properties.

The greening method of the present invention is characterized in that the material is a biodegradable plastic and has a depth of about 0.5 to 2.0 cm irrespective of the wall thickness, the vertical and horizontal dimensions and the shape of the opening. Use a mat-shaped cultivation container formed in a thin dish shape, fill and fill the cultivation soil in the cultivation container, sow or plant seedlings, cultivate the plant, and grow it in artificial soil or greening The entire container is exposed from the soil surface without cultivating the seedlings and replanting them without cutting the seedlings without cutting the seedlings, without covering the seedlings all over the soil surface or laying them in a mosaic form or arranging them at the desired predetermined interval It has a structural feature in the place where it is buried without, and when growing seedlings, it can prevent the turning phenomenon of the root in the container, it can be quick and labor-saving without the trouble of transplanting, and the direct root at the time of transplanting Many branches and fine roots are cut, including It does not have poor rooting after embedding and has excellent root survival, excellent spread and growth of planted plants after transplanting, and continuous generational changes on artificial soil and greening surfaces to purify the air. It greatly contributes to the prevention of global warming, such as prevention of drying, prevention of global warming, and mitigation of the heat island phenomenon, and has an excellent effect, such as improvement of the living environment including the landscape.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing a planting container for mat cultivation according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing a state in which the planting container of FIG. 1 is buried in the soil, and all the planting containers are buried in the soil.

FIG. 3 is a vertical cross-sectional view schematically showing one state at the time of transplanting a conventional plant. The plant is taken out from the planting vessel and is root-cut (the length of the root is adjusted) according to the arrow in the figure.

FIG. 4 is a vertical cross-sectional view schematically showing one state of a conventional rooftop or slope greening method. Even if a biodegradable planting container is used, the planting container is not fully filled with culture soil up to the upper end of the peripheral wall, and the entire container is not buried underground, so the upper end of the peripheral wall above the ground Will remain without biodegradation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plant container for mat cultivation of the present invention 3 ... Plant 4 ... Root 5 ... Culture soil 10 ... Planting container for conventional mat cultivation (use method) X ... Artificial soil surface Y ... Slope

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2B022 AA01 AB02 BA02 2B027 NA10 NC02 NC13 NC24 NC25 NC40 ND03 NE05 QA04 QB03 2D044 DA17

Claims (6)

[Claims] 1. A material for a mat cultivation plant having a depth of about 0.5 to 2.0 cm irrespective of the area of the opening. After filling the culture soil and planting seedlings or seedlings in the culture soil and nurturing, when transplanting the plant, the whole mosaic is kept in the planting container or in a mosaic with a desired predetermined interval between the plants. A greening method, comprising burying all of the containers side by side in the ground and cultivating the plant to make a green roof or a green slope. 2. The greening method according to claim 1, wherein the plastic is mainly composed of polylactic acid. 3. The greening method according to claim 1, wherein the plastic is a foam. 4. When transplanting a plant, all of the container is buried in the ground while being held in a planting container, and then the plant is grown to make a rooftop or slope greening. A biodegradable plastic material, having a drain hole at the bottom, and having a depth of 0.5 to 2.0 irrespective of the area of the opening.
A planting container for mat cultivation, which is formed to have a size of about cm and can be laid in a mosaic shape on the whole surface or in a mosaic shape separated by a predetermined interval. 5. The planting container for mat cultivation according to claim 4, wherein said plastic is mainly composed of polylactic acid. 6. A planting container for mat cultivation according to claim 4, wherein said plastic is a foam.