JP2010148446A - Plant growing base for rooftop gardening - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plant growing base for rooftop greening which contains a water permeable layer provided on a rooftop, and a plant raising layer provided on the water permeable layer and containing porous granules, prevents clogging of the water permeable layer caused by fine particles produced by crushing of the granules, and further increases water retainability and manure retainability of the plant raising layer. <P>SOLUTION: The plant growing base for rooftop greening includes a water permeable layer provided on a rooftop and a plant raising layer provided on the water permeable layer. The plant raising layer includes a mixture of porous granules, soil containing clay granules, an aggregate agent, and water. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plant growth base for rooftop greening.

For the purpose of rooftop greening, a plant growth base is provided on the roof of the building. Conventionally, some plant growth bases for rooftop greening include a water permeable layer provided on the roof and a plant growth layer provided on the water permeable layer (see Patent Document 1). Plants are grown in the plant growth layer. Water and fertilizer are supplied to the plant growth layer, and the water supplied to the plant growth layer is discharged from the plant growth base through the water permeable layer.
JP 2003-33112 A

  The plant growth layer is made of a mixture of soil, charcoal, and zeolite. Each of the charcoal and the zeolite is a porous granular material and is relatively light. For this reason, the said plant growth layer can be reduced in weight and the load which the said plant growth base applies to the said roof can be reduced. The numerous holes of the granular material store water and fertilizer supplied to the plant growth layer. For this reason, the water retention property and fertilization property of the plant growth layer can be enhanced, and the growth of the plant can be promoted.

  The porous granular material is generally relatively brittle, and during the handling of the granular material, the granular material rubs or the granular material hits another object and is crushed. When the granular material is crushed, fine particles are generated. For this reason, the granular material contains the fine particles. The fine particles are caused to flow into the permeable layer by the water supplied to the plant growth layer, causing the permeable layer to be clogged. Thereby, the drainage from the said plant growth layer falls, and root decay occurs in the said plant.

  In order to reduce the load applied to the roof by the plant growth base, the thickness of the plant growth layer is often reduced, and the plant growth layer is easily dried. For this reason, it is difficult to maintain the water supplied to the plant growth layer, and it is desired to further increase the water retention of the plant growth layer. Moreover, the roof is often exposed to heavy rain and strong wind, and the fertilizer supplied to the plant growth layer is washed away by heavy rain or scattered by strong wind. For this reason, it is difficult to maintain the fertilizer supplied to the plant growth layer, and it is desired to further enhance the fertilizer of the plant growth layer.

  An object of the present invention is a plant growth base for rooftop greening, comprising a water permeable layer provided on the rooftop, and a plant growth layer provided on the water permeable layer and containing a porous granular material. It is intended to prevent the water permeable layer from being clogged by fine particles generated by breaking up the granular material, and to further enhance the water retention and fertilizer retention of the plant growth layer.

  In the present invention, the plant growth layer is composed of a mixture of the granular material, soil containing clay particles, a granule agent, and water. As a result, the fine particles generated by crushing the granular material form a aggregate structure together with the clay particles by the aggregation action of the aggregate agent. This prevents the fine particles from flowing into the water permeable layer by the water supplied to the plant growth layer, and prevents the water permeable layer from being clogged by the fine particles. . Further, water and fertilizer can be stored in the voids present in the aggregate structure in addition to the pores of the granular material, thereby enhancing the water retention and fertilization properties of the plant growth layer.

  The plant growth base for rooftop greening according to the present invention includes a water permeable layer provided on the rooftop, and a plant growth layer provided on the water permeable layer, the plant growth layer comprising a porous granular material and It consists of a mixture of soil containing clay particles, agglomerates and water. Plants are grown in the plant growth layer. Water and fertilizer are supplied to the plant growth layer, and the water supplied to the plant growth layer is discharged from the plant growth base through the water permeable layer.

  Since the granular material is porous, it is relatively lightweight. For this reason, the said plant growth layer can be made comparatively lightweight, and the load which the said plant growth base applies to the said roof can be made comparatively small. The numerous holes of the granular material store water and fertilizer supplied to the plant growth layer. For this reason, the water retention property and fertilization property of the plant growth layer can be enhanced, and the growth of the plant can be promoted.

  When producing the mixture, the granular material, the soil, the aggregate agent and the water are mixed and stirred. At this time, due to the aggregating action of the aggregate agent, the clay particles contained in the soil aggregate to form an aggregate structure composed of a plurality of aggregate particles. The mixture has large voids through which air and water pass between the aggregates, and is excellent in air permeability and drainage. Moreover, the said mixture has the small space | gap which stores water and a fertilizer between the said clay particles which comprise the said aggregate, and is excellent in water retention and fertilizer retention. Since the mixture stores water and fertilizer not only in the pores of the granular material but also in the small voids, the water retention and fertilization properties of the plant growth layer can be further enhanced.

  By the way, the granular material is generally relatively brittle, and the granular material is rubbed during the handling of the granular material, or the granular material hits another object and is crushed. When the granular material is crushed, fine particles are generated. For this reason, the granular material contains the fine particles. When the granular material, the soil, the aggregate and the water are mixed and stirred, the fine particles aggregate together with the clay particles to form the aggregate due to the aggregation action of the aggregate. To do. For this reason, the fine particles are not caused to flow into the water permeable layer by the water supplied to the plant growth layer, and the water permeable layer is not clogged by the fine particles. Thereby, the drainage from the said plant growth layer does not fall, and it can prevent that root rot arises in the said plant.

The mixture per total of about 1.0 m ³ of the soil and the particulate material, the particulate material is about 0.3 m ³ and about 0.9 m ^3, the water is about 0.1 m ³ and about 0. 5 m ³ , and the aggregate may be about 1 kg to about 6 kg. The granular material may be made of pearlite or cellular concrete. The weight of the clay particles is about 20% to about 50% of the weight of the soil.

  The plant growth base for rooftop greening according to the present invention includes a water permeable layer provided on the roof, and a plant growth layer provided on the water permeable layer, the plant growth layer comprising a porous granular material and And a mixture of soil containing clay particles, agglomerates, a water-absorbing resin, and water.

  By the way, when the granular material, the soil, the aggregate, and the water are mixed, the aggregate is dissolved in the water and mixed with the soil. For this reason, in order to form the aggregate structure in the entire mixture, the amount of water must be increased to such an extent that the water used for forming the aggregate structure is not insufficient. However, if the amount of water is too large, all of the water is not used for forming the aggregate structure, and a part of the water is not used for forming the aggregate structure. Excess water that is not used for forming the aggregate structure may drip from the mixture when the mixture is transported to the rooftop, and may contaminate the rooftop and its surroundings. By containing the water absorbent resin in the mixture, the excess water is absorbed by the water absorbent resin. Thereby, it is possible to prevent the excess water from dripping from the mixture, and it is possible to prevent the rooftop and its surroundings from being soiled during the transportation of the mixture to the rooftop.

  The water absorbed by the water absorbent resin is released from the water absorbent resin when the plant growth layer is dried. For this reason, even if the plant growth layer is dried, the plant can absorb water released from the water absorbent resin. Thereby, the frequency which waters the said plant growth layer can be reduced, and the effort required for the maintenance management of the said plant growth base can be reduced.

  The plant growth base for rooftop greening according to the present invention includes a water permeable layer provided on the rooftop, and a plant growth layer provided on the water permeable layer, the plant growth layer comprising a porous granular material and It consists of a mixture of soil containing clay particles, plant fragments, agglomerates and water.

  The crushed pieces of the plant are entangled with the aggregate to reinforce the plant growth layer. For this reason, the plant growth layer is excellent in erosion resistance and stability, and is not easily washed away by rain. In addition, the crushed pieces of the plant ripen over time to become fertilizers of the plant, and promote the growth of the plant.

  The material of the plant growth layer used for the plant growth base for rooftop greening according to the present invention shall consist of a mixture of porous granular material, soil containing clay particles, aggregating agent, and water. Can do. Moreover, the material of the said plant growth layer shall consist of a mixture of the porous granular material, the soil containing a clay particle, a aggregate agent, a water absorbing resin, and water. Moreover, the material of the said plant growth layer shall consist of a mixture of the porous granular material, the soil containing a clay particle, the fragment of a plant, a aggregate agent, and water.

  According to the present invention, in the plant growth base for rooftop greening including a water permeable layer provided on the roof and a plant growth layer provided on the water permeable layer, the plant growth layer is a porous granular material. And a mixture of clay containing clay particles, aggregating agent, and water. For this reason, the fine particles generated by breaking the granular material during handling of the granular material form aggregates together with the clay particles by the aggregation action of the aggregated agent when the mixture is formed. Thereby, the fine particles are not caused to flow into the water permeable layer by the water supplied to the plant growth layer, and the water permeable layer is not clogged by the fine particles. For this reason, drainage from the plant growth layer does not deteriorate, and root rot can be prevented from occurring in the plant. In addition, the mixture can store water and fertilizer not only in the pores of the granular material but also in the voids present in the aggregate, thereby further improving the water retention and fertilization properties of the plant growth layer. Can be increased.

  As shown in FIG. 1, a plant growth base 12 is provided on the roof 10 of a building for the purpose of greening the roof. The plant growth base 12 includes a water permeable layer 14 provided on the rooftop 10, a water permeable sheet 16 disposed on the water permeable layer, and a plant growth layer 18 provided on the water permeable sheet.

  Plants 20 are grown in the plant growth layer 18. Water and fertilizer are supplied to the plant growth layer 18, and the water supplied to the plant growth layer 18 is discharged from the plant growth base 12 through the water permeable sheet 16 and the water permeable layer 14. The surface of the rooftop 10 is waterproofed with a water-impermeable paint, a water-impermeable sheet, a water-impermeable concrete, or the like (not shown), and water that has passed through the water-permeable layer 14 does not soak into the rooftop 10. In the example shown in FIG. 1, the water permeable layer 14 is in contact with the rooftop 10, but instead, a plate or a sheet (not shown) may be interposed between the water permeable layer 14 and the rooftop 10. Thereby, it can prevent that the rooftop 10 gets dirty with the water which passed through the water-permeable layer 14. FIG.

  The water permeable layer 14 is made of, for example, a granular material spread on the rooftop 10. The granular material is made of pearlite, for example. The pearlite is porous and relatively light. For this reason, the water-permeable layer 14 can be made comparatively lightweight, and the load which the plant growth base 12 applies to the rooftop 10 can be made comparatively small. The water permeable sheet 16 is made of a nonwoven fabric, for example.

  The water permeable layer 14 may be made of a mat made of a fiber material instead of the above example made of the granular material. The water-permeable sheet 16 may be made of a woven cloth instead of the above-described example made of the non-woven cloth. The plant growth base 12 is replaced with the water permeable sheet 16 between the water permeable layer 14 and the plant growth layer 18 instead of the example shown in FIG. 1 in which the water permeable sheet 16 is interposed between the water permeable layer 14 and the plant growth layer 18. The plant growth layer 18 may be provided directly on the water permeable layer 14 without intervening.

  The plant growth layer 18 is made of a mixture of porous granular materials, soil containing clay particles, aggregate agents, and water. The granular material is made of pearlite, cellular concrete, Haruna stone, charcoal, zeolite, or the like. The pearlite may be made by firing pearl stone, or may be made of unburned pearl stone (natural pearlite). The diameter of the granular material is, for example, about 1 cm to 2 cm. The weight of the clay particles is about 20% to about 50% of the weight of the soil. The aggregating agent is a polymer flocculant.

For a total of about 1.0 m ³ of the granulate and the soil, the granule is about 0.3 m ^{3 to} about 0.9 m ³ and the water is about 0.1 m ^{3 to} about 0.5 m ³ . The agglomerates are about 1 kg to about 6 kg. Per total of about 1.0 m ³ of the soil and the particulate material, when the granular material is about 0.3 m ^3, the soil is about 0.7 m ^3. Further, when the granular material is about 0.9 m ³ for a total of about 1.0 m ³ of the granular material and the soil, the soil is about 0.1 m ³ . In the example shown in FIG. 2, for a total of about 1.0 m ³ of the granular material and the soil, the granular material is about 0.5 m ³ , the soil is about 0.5 m ³ , and the aggregate agent Is about 1.5 kg and the water is about 0.15 m ³ . The granular material is made of natural perlite.

  Since the granular material is porous, it is relatively lightweight. For this reason, the plant growth layer 18 can be made relatively light, and the load applied to the roof 10 by the plant growth base 12 can be made relatively small. The numerous holes of the granular material store water and fertilizer supplied to the plant growth layer 18. For this reason, the water retention property and fertilization property of the plant growth layer 18 can be enhanced, and the growth of the plant can be promoted.

  When producing the mixture, the granular material, the soil, the aggregate agent and the water are mixed and stirred. At this time, due to the aggregating action of the aggregate agent, the clay particles contained in the soil aggregate to form an aggregate structure composed of a plurality of aggregate particles. The production | generation of the said mixture may be performed in a factory, and may be performed in the field where the plant growth base 12 is constructed.

  The mixture has large voids through which air and water pass between the aggregates, and is excellent in air permeability and drainage. Moreover, the said mixture has the small space | gap which stores water and a fertilizer between the said clay particles which comprise the said aggregate, and is excellent in water retention and fertilizer retention. Thus, the mixture can store water and fertilizer not only in the pores of the granular material but also in the small gaps. For this reason, the water retention property and fertilization property of the plant growth layer 18 can be further improved.

  By the way, the granular material is generally relatively brittle, and the granular material is rubbed during the handling of the granular material, or the granular material hits another object and is crushed. When the granular material is crushed, fine particles are generated. For this reason, the granular material contains the fine particles. When the granular material, the soil, the aggregate agent and the water are mixed and stirred, the fine particles are aggregated together with the clay particles by the aggregation action of the aggregate agent to form the aggregate structure. Form. Therefore, the fine particles are not caused to flow into the water permeable sheet 16 and the water permeable layer 14 by the water supplied to the plant growth layer 18, and the water permeable sheet 16 and the water permeable layer 14 are clogged by the fine particles. Will not cause. Thereby, the drainage property from the plant growth layer 18 is not deteriorated, and root rot can be prevented from occurring in the plant 20.

  When constructing the plant growth base 12, first, the water permeable layer 14 is provided on the rooftop 10, and then the water permeable sheet 16 is disposed on the water permeable layer 14. Thereafter, the mixture is placed on the water-permeable sheet 16 to provide the plant growth layer 18.

  In the example shown in FIG. 3, it replaces with the example shown in FIG. 2 in which the fragment of a plant is not contained in the said mixture, and the fragment of a plant is contained in the said mixture. The plant growth layer 18 is composed of a mixture of the granular material, the soil, the crushed pieces of the plant, the aggregate, and the water.

  The crushed pieces of the plant consist of tree trunks, foliage or root pieces, grass pieces or a mixture thereof, and are unripe. The diameter of the plant fragment is about 2 mm to about 15 mm, and the length of the plant fragment is about 2 cm to about 15 cm. When the said mixture is produced | generated, the said granular material, the said soil, the said aggregate agent, the said water, and the fragment of a plant are mixed and stirred. At this time, the crushed pieces of the plant are entangled with the aggregate to reinforce the plant growth layer 18. For this reason, the plant growth layer 18 is excellent in erosion resistance and stability, and is not easily washed away by rain. Further, the plant fragments are ripened over time to become fertilizer for the plant 20 and promote the growth of the plant.

For a total of about 1.0 m ³ of the granular material, the soil and the plant fragments, the granular material is about 0.3 m ^{3 to} about 0.9 m ³ and the water is about 0.1 m ^{3 to} about 0.5 m ³ and the aggregate is about 1 kg to about 6 kg. When the granular material is about 0.3 m ³ for a total of about 1.0 m ³ of the granular material, the soil, and the crushed pieces of the plant, the total of the soil and the crushed pieces of the plant is about 0.003. 7 m ³ . In addition, when the granular material is about 0.9 m ³ for a total of about 1.0 m ³ of the granular material, the soil, and the crushed pieces of the plant, the total of the soil and the crushed pieces of the plant is about 0.1 m ³ . In the example shown in FIG. 3, for a total of about 1.0 m ³ of the granular material, the soil, and the plant fragments, the granular material is about 0.5 m ³ and the soil is about 0.25 m ³ . Yes, the plant fragment is about 0.25 m ³ , the aggregate is about 1.5 kg, and the water is about 0.15 m ³ .

In the example shown in FIG. 4, the granular material is made of cellular concrete instead of the example shown in FIG. 3 in which the granular material is made of natural pearlite. In this case, as in the example shown in FIG. 3, per a total of about 1.0 m ³ of the crushed pieces of the plant and the soil and the particulate material, the particulate material is about 0.3 m ³ and about 0. 9 m ³ , the water is about 0.1 m ^{3 to} about 0.5 m ³ , and the aggregate is about 1 kg to about 6 kg. Figure in the example shown in 4, per a total of about 1.0 m ³ of the crushed pieces of the plant and the soil and the particulate material, the particulate material is about 0.5 m ^3, the soil is about 0.25 m ³ The plant fragment is about 0.25 m ³ , the aggregate is about 1.5 kg, and the water is about 0.15 m ³ .

  The cellular concrete can be obtained by crushing an ALC plate that is a waste material. By using the waste material for the granular material, the waste material can be effectively used. In addition, the cellular concrete obtained from the waste material is relatively inexpensive, and the material cost of the plant growth layer 18 can be reduced.

  In the example shown in FIG. 5, instead of the example shown in FIG. 2 in which the water-absorbing resin is not contained in the mixture, the water-absorbing resin is contained in the mixture. The plant growth layer 18 is made of a mixture of the granular material, the soil, the aggregate, the water-absorbing resin, and the water. The water-absorbent resin is in a powder form and can absorb, for example, about 150 to about 300 times its own weight of water. The water-absorbing resin may be a starch-based resin or sodium polyacrylate.

  By the way, when the granular material, the soil, the aggregate, and the water are mixed, the aggregate is dissolved in the water and mixed with the soil. For this reason, in order for the aggregate structure to be formed in all of the mixture, the amount of water must be sufficient to allow the aggregate agent to mix with all of the soil. .

  In the mixture, not only the water but also water contained in the soil is present. For this reason, strictly speaking, the amount of water required for forming the aggregate structure varies depending on the water content of the soil. However, it takes a lot of labor to measure the water content of the soil and change the amount of water according to the measurement result. Therefore, in order not to change the amount of water according to the water content of the soil, the amount of water is used for forming the aggregate structure even if the water content of the soil is relatively small. It is preferable to increase the amount of water so as not to be insufficient.

  However, if the amount of water is too large, all of the water is not used for forming the aggregate structure, and excess water may be dripped from the mixture without being used for forming the aggregate structure. . If the excess water hangs down from the mixture while the mixture is being transported to the rooftop 10, the surroundings of the building or the rooftop 10 may become dirty.

  By containing the water absorbent resin in the mixture, the excess water is absorbed by the water absorbent resin. Thereby, it is possible to prevent the excess water from dripping from the mixture, and it is possible to prevent the surroundings of the building and the rooftop 10 from being soiled during transportation of the mixture to the rooftop 10. If the amount of the excess water is greater than the amount of water that can be absorbed by the water absorbent resin, the water absorbent resin cannot absorb all of the excess water. In this case, the water that has not been absorbed by the water absorbent resin is discharged from the plant growth base 12 through the water permeable sheet 16 and the water permeable layer 14.

  The water absorbed by the water absorbent resin is released from the water absorbent resin when the plant growth layer 18 is dried. For this reason, even if the plant growth layer 18 dries, the plant 20 can absorb the water released from the water absorbent resin. Thus, the water-absorbent resin can improve the water retention of the plant growth layer 18. Thereby, the frequency which waters the plant growth layer 18 can be reduced, and the effort required for the maintenance management of the plant growth base 12 can be reduced.

  When producing | generating the said mixture, the said granular material, the said soil, the said aggregate agent, and the said water are first mixed and stirred. Thereafter, the water-absorbing resin is added to these and stirred. The granular material, the soil, the aggregate agent and the water are mixed and stirred, and then the water-absorbing resin is added thereto so that the water necessary for forming the aggregate structure is added to the water-absorbing resin. It is prevented that the aggregate structure is not sufficiently formed by being absorbed.

  The water-absorbent resin may be dried, or may have been previously absorbed and have water absorption capability. By making the water-absorbent resin absorb water in advance, the water retention of the plant growth layer 18 immediately after the construction of the plant growth base 12 can be increased, and the plant 20 or the plant growth planted in the plant growth layer 18 can be increased. The rooting of the plant 20 germinated in the layer 18 can be improved.

For a total of about 1.0 m ³ of the granulate and the soil, the granule is about 0.3 m ^{3 to} about 0.9 m ³ and the water is about 0.1 m ^{3 to} about 0.5 m ³ . The aggregating agent is about 1 kg to about 6 kg, and the water absorbent resin is about 1.0 kg. In the example shown in FIG. 5, for a total of about 1.0 m ³ of the granular material and the soil, the granular material is about 0.5 m ³ , the soil is about 0.5 m ³ , and the aggregate The agent is about 2.0 kg, the water-absorbing resin is about 1.0 kg, and the water is about 0.25 m ³ . The granular material is made of natural perlite.

  In the examples shown in FIGS. 6 and 7, the mixture contains organic fertilizer instead of the example shown in FIG. 5 where the mixture does not contain organic fertilizer. The plant growth layer 18 is composed of a mixture of the granular material, the soil, the crushed pieces of the plant, the organic fertilizer, the aggregate agent, the water absorbent resin, and the water. The organic fertilizer is made of compost such as bark compost. The organic fertilizer may be made of another fertilizer such as manure instead of the example shown in FIG. 6 made of the compost.

For a total of about 1.0 m ³ of the granular material, the soil, the plant fragments and the organic fertilizer, the granular material is about 0.3 m ^{3 to} about 0.9 m ³ , and the water is about 0.00 m ³ . 1 m ^{3 to} about 0.5 m ³ and the agglomerates are about 1 kg to about 6 kg. When the granular material is about 0.3 m ³ for a total of about 1.0 m ³ of the granular material, the soil, the plant fragment and the organic fertilizer, the soil, the plant fragment and the organic The total with fertilizer is about 0.7 m ³ . Moreover, when the granular material is about 0.9 m ³ for a total of about 1.0 m ³ of the granular material, the soil, the plant fragment and the organic fertilizer, the soil and the plant fragment The total with the organic fertilizer is about 0.1 m ³ .

In the example shown in FIG. 6, for a total of about 1.0 m ³ of the granular material, the soil, the plant fragment and the organic fertilizer, the granular material is about 0.5 m ³ , and the soil is about 0.3 m ³ , the plant fragment is about 0.1 m ³ , the organic fertilizer is about 0.1 m ³ , the aggregate is about 2.0 kg, and the water absorbent resin is About 1.0 kg and the water is about 0.25 m ³ . The granular material is made of cellular concrete.

In the example shown in FIG. 7, per a total of about 1.0 m ³ of the organic fertilizer with the fragments of the plant and the soil and the particulate material, the particulate material is about 0.75 m ^3, the soil is about is 0.15 m ^3, fragments of said plant is about 0.05 m ^3, wherein the organic fertilizer is about 0.05 m ^3, the crumb material is about 1.0 kg, the water-absorbent resin About 0.5 kg and the water is about 0.125 m ³ . The granular material is made of cellular concrete.

The longitudinal cross-sectional view of the plant growth base of this invention. The compounding example of the material of the plant growth layer which concerns on 1st Example of this invention. The compounding example of the material of the plant growth layer which concerns on 2nd Example of this invention. The compounding example of the material of the plant growth layer which concerns on 3rd Example of this invention. The compounding example of the material of the plant growth layer which concerns on 4th Example of this invention. The compounding example of the material of the plant growth layer which concerns on 5th Example of this invention. The compounding example of the material of the plant growth layer which concerns on 6th Example of this invention.

Explanation of symbols

10 rooftop 12 plant growth base 14 water permeable layer 16 water permeable sheet 18 plant growth layer 20 plant

Claims (9)

Including a water permeable layer provided on the roof, and a plant growth layer provided on the water permeable layer,
The plant growth layer is a plant growth base for rooftop greening, which is composed of a mixture of porous particles, clay containing clay particles, agglomerates, and water. For a total of about 1.0 m ³ of the granulate and the soil, the granule is about 0.3 m ^{3 to} about 0.9 m ³ and the water is about 0.1 m ^{3 to} about 0.5 m ³ . The plant growth base for rooftop greening according to claim 1, wherein the aggregate is about 1 kg to about 6 kg. Including a water permeable layer provided on the roof, and a plant growth layer provided on the water permeable layer,
The plant growth layer is a plant growth base for rooftop greening, comprising a mixture of porous granular material, soil containing clay particles, agglomerates, a water absorbent resin, and water. Including a water permeable layer provided on the roof, and a plant growth layer provided on the water permeable layer,
The plant growth layer is a plant growth base for rooftop greening, comprising a mixture of porous granular materials, soil containing clay particles, plant fragments, aggregates, and water.   The plant growth base for rooftop greening according to any one of claims 1, 3, and 4, wherein the granular material is made of perlite or cellular concrete.   The plant growth base for rooftop greening according to any one of claims 1, 3, and 4, wherein the weight of the clay particles is about 20% to about 50% of the weight of the soil.   The plant growth layer material used for the plant growth base for rooftop greening according to claim 1, comprising a mixture of porous granular material, soil containing clay particles, aggregating agent, and water. Plant growth layer material.   It is the material of the plant growth layer used for the plant growth base for rooftop greening of Claim 3, Comprising: Porous granular material, the soil containing a clay particle, a aggregate agent, a water absorbing resin, water, A plant growth layer material comprising a mixture of   It is the material of the plant growth layer used for the plant growth base for rooftop greening of Claim 4, Comprising: The porous granular material, the soil containing a clay particle, the fragment of a plant, a aggregate agent, water A plant growth layer material consisting of a mixture of

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