JPH0515252A - Lawn grass raising bed - Google Patents

Abstract

PURPOSE:To provide a lawn grass raising bed useful for golf course, laid on a natural ground, etc., stopping effluence of surface soil, repressing weed growth and excellently saving labor, comprising specific nonwoven fabric, surface soil heaped up on the nonwoven fabric and lawn grass seeds added to the soil. CONSTITUTION:The objective lawn grass raising bed laid on a natural ground 1 or a prepared ground is composed of non woven fabric (preferably 2-10mm thickness) 2 made by opening and mixing inorganic fibers such as slug wool with a soft binder resin such as polyvinyl chloride series and thermally molding, surface soil 3 heaped up on the nonwoven fabric 2 and lawn grass seeds 4 or vegetative propagation plant added on the nonwoven fabric 2 or to the surface soil 3. The compounding ratio of the inorganic fibers and the soft binder is preferably 70-99(wt.)% inorganic fibers and 30-1% soft binder.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention promotes the growth of turfgrass,
The present invention relates to a turfgrass growth bed that suppresses the growth of weeds and saves labor for turfgrass training and transplantation.

[0002]

2. Description of the Related Art Agricultural chemicals such as bactericides and herbicides have been widely used to maintain the soundness of lawns in golf courses and parks. However, in recent years, it has been pointed out that heavy use of these pesticides pollutes the environment, and the amount used is limited. As a result, for the conservation of the lawn,
A so-called turf lawn method in which a lawn infested by pests is removed and a healthy lawn trained in another field is attached to the part is popular.

However, in the conventional lawn turf construction method, the lawn is cultivated in order to cultivate the lawn by sowing the lawn on the soil and sowing the turf cuttings of the lawn. In order to improve the survival rate and maintain the handling strength, the thickness needs to be about 15 to 20 mm,
When it is made long, it has a drawback that it is heavy and fragile, and the diameter when wound into a roll is large, making it difficult to carry. For this reason, in the case of Koryo turf-type tension turf, the one cut into strips of several tens of centimeters square is used, but the drawback of poor workability has not been solved. In addition, the Western turf type varieties also have the drawback that they have poor rooting and are easily separated, making it difficult to wind them into a roll.

[0004]

It is conceivable to use a commercially available synthetic fiber non-woven fabric as a base for such a lawn grass growing floor, but the synthetic fiber non-woven fabric is excellent in durability and strength. May be defective. That is,
The non-woven fabric made of synthetic fiber keeps its original shape for a long time and remains in the soil. Especially when it is used as a green on a golf course, a situation occurs in which the cup hole cannot be cut well.

In addition, since the synthetic fiber non-woven fabric is inferior in compatibility with soil and the top soil layer is isolated from the soil in the ground by the non-woven fabric, when the growth condition of turfgrass deteriorates,
There was a drawback that the lawn was easily peeled off together with the topsoil layer. Also,
The topsoil was likely to be excessively dried, which could damage the grass. Further, it is not preferable from the viewpoint of environmental protection to use a large amount of synthetic fiber nonwoven fabric in soil.

The present invention has been devised in order to solve such a problem. By using an inorganic fiber as a basic sheet for a turfgrass growth floor, the turfgrass grows smoothly and the lawn strength is maintained. In addition, the sheet itself is used as a part of the turfgrass soil, to supplement the silicic acid content necessary for the sound growth of the turfgrass, and to provide a turfgrass growth floor that does not generate pollutants. To do.

[0007]

[Means for Solving the Problems] The turfgrass growing bed of the present invention comprises:
In order to achieve the object, it is composed of a nonwoven fabric laid on the natural ground or constructed ground, and a topsoil laid on the nonwoven fabric, the nonwoven fabric is defibrated and mixed with inorganic fibers and a flexible binder resin. It is characterized in that it is heat-molded and is obtained by adding turfgrass seeds or vegetative propagules onto the non-woven fabric or on the surface soil.

As the inorganic fibers, rock wool, slag wool, glass wool, etc. are used, which are knitted into a sheet shape or bonded with a flexible binder resin during knitting and molded into a thickness of 1 to 20 mm. Is used. More preferably, the thickness is 2 to 10 mm. This thickness is the thickness required for retaining the topsoil before the planted turfgrass roots on the natural ground. If the thickness is less than 1 mm, the surface soil is not sufficiently retained. On the other hand, when the thickness exceeds 20 mm, the adhesion to the natural ground becomes poor, and the sheet is likely to be lifted due to germination of weeds. In addition, it becomes difficult to wind it into a roll, which causes inconvenience in handling.

[0009]

[Operation] Inorganic fibers are composed mainly of SiO ₂ and CaO. For example, slag sheet obtained from blast furnace slag is a fertilizer necessary for plant growth, SiO ₂ ·.
It contains xCaO, Mg, Fe, Mn and the like. Therefore, the seeds and seedlings of turfgrass planted in the topsoil gradually dissolve the slag sheet by the action of the roots, extract minerals, and grow smoothly. This point is basically different from the case of using the conventional synthetic fiber sheet. Moreover, it has a predetermined water retention property and water drainage, and the topsoil is maintained in an appropriate wet state.

Further, the inorganic fiber has a good compatibility with the natural soil due to its component system. Therefore, the stability of the topsoil piled up on the sheet is good, and the sheet itself adheres to the natural ground. Furthermore, since the inorganic fiber sheet gradually weathers and decomposes over a long period of time and becomes part of the soil,
It does not generate substances that cause pollution.

The porosity of the inorganic fiber sheet changes depending on the packing density of the inorganic fibers. This porosity has a water permeability that allows water to reach the natural ground from the topsoil through the inorganic fiber sheet, and a weed-preventive property that suppresses weeds from sprouting on the topsoil from the natural ground through the inorganic fiber sheet. Influence. Generally, in order to obtain a large water permeability, the porosity may be increased, but the weed-proof property is lowered. On the contrary, if the porosity is increased in order to improve the weed-proof property, the water permeability is lowered. Therefore, considering both water permeability and weed control,
It is preferable to form the inorganic fiber into a sheet with a packing density of about 40 to 300 kg / m ³ .

In order to adjust the water retention and water permeability of the inorganic fiber sheet, the inorganic fiber may be surface-treated with a surfactant in advance. In this case, the usable surfactant must be one that does not adversely affect germination and growth of turfgrass. As such an example, a nonionic surfactant is generally preferable. By this surface treatment, it is possible to impart high water permeability to the inorganic fiber sheet while having a low porosity, and prevent the topsoil from becoming excessively wet. Furthermore, in order to enhance water retention, germination of turfgrass, modified acrylic resin of a type that does not adversely affect growth, high-molecular water-absorbing polymer such as starch, clay minerals such as smectite in a sheet or sheet if necessary. It may be added to the surface.

Examples of the inorganic fibers include rock wool produced from the above-mentioned blast furnace slag or natural rocks. A mixture of these inorganic fibers and a flexible binder resin is knitted into a mat shape or a sheet shape, and then heat-treated to form a sheet. In this case, if necessary, the needling treatment may be performed to increase the strength of the sheet. Further, if necessary, after laminating a plurality of sheets, it is possible to process them into a single sheet by a needling process or the like.

Examples of the flexible binder resin used for molding include powdery, granular or fibrous thermoplastic resins such as vinyl chloride, styrene, polyolefin polyester and nylon. Preferably, there is a heat-fusible fiber such as a clad / core multi-layer type which is made of a resin obtained by processing them into a fibrous form and having different melting temperatures. The heat-fusible fiber is preferably one that decomposes after a long period of time while being buried in soil. Then, the inorganic fiber sheet is appropriately bonded by heating the inorganic fiber sheet during or after the molding. Although not limiting the present invention, the flexible binder resin is mixed in an amount of 30 to 1 part by weight with respect to 70 to 99 parts by weight of the inorganic fiber.

In addition, organic fibers, which are a raw material for organic compost for soil improvement, may be added during knitting of the inorganic fibers. This type of organic fiber includes wood fiber, peat moss, water moss,
Hemp fiber, coconut shell fiber, cellulose fiber, cotton, suf, rayon, etc. are used. However, since the organic fiber is prone to decay rapidly and may cause germination of turfgrass and impair growth during the decay, it is preferable to add 50% by weight or less when blending.

The turfgrass seeds or vegetative propagules can be applied to the inorganic fiber sheet or to the topsoil, but are preferably applied to the inorganic fiber sheet. In addition, at this time, it is preferable that the seed or the vegetative propagule is applied, and then sand or soil is used to cover the soil with a thickness of about 5 mm. Top soil is further applied on this, but the total thickness of the cover soil and top soil is 10 mm.
It is preferably at a level or less. When the thickness exceeds 10 mm, the handling property when digging from the field and transferring it to the natural ground at another place is deteriorated when the rooting of turfgrass has progressed to some extent.

As the vegetative propagule, a stalk or rhizome of turf grass cut to an appropriate length, or a plant grown by tissue culture or the like is used. This vegetative breeder
Like the seeds of turfgrass, it is applied on the inorganic fibrous sheet or on the topsoil. The roots from the seeds or seedlings of the turfgrass planted on the topsoil penetrate the inorganic fibrous sheet as they grow and root in the underlying natural ground. As a result, the inorganic fibrous sheet is reliably held against the natural ground, and the grass bed is not separated from the natural ground.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings. Example 1: The turfgrass growing bed of this example comprises an inorganic fiber sheet 2 laid on a natural ground 1 as shown in FIG.
It has a two-layer structure of the covering soil 3 laid on the inorganic fiber sheet 2.

As the inorganic fiber sheet 2, there was used rock wool mixed with 12% by weight of polyethylene / polypropylene heat-fusible fiber as a flexible binder resin and molded into a thickness of 2.6 mm. The density of this inorganic fiber sheet 2 is 180 kg / m ³ . JIS-
Based on L1085, the size of the specimen is 200x50m
m, length between chucks 100 mm, pulling speed 300 m
The tensile strength in MD (length direction) and CD (width direction) was measured with a universal testing machine as m / min.
It was 8.5 kg / 5 cm and CD was 3 kg / 5 cm. Next, the inorganic fiber sheet 2 is 75 mm × 75 mm
It was soaked in water for 20 minutes, and the volume ratio of the increase due to water absorption at the time of pulling was determined, and it was 96% by volume.

Comparative Example 1: As the sheet 2, a commercially available greening mat (Vairin mat manufactured by Nippon Vilene Co., Ltd.), 100% synthetic fiber non-woven fabric, thickness 9.2 mm, and density 50 kg / m ³ were used. When the tensile strength of this sheet was measured using the same measuring method and measuring apparatus as in Example 1, the MD was 25 kg / 5 cm and the CD was 13 kg / 5c.
It was m. Further, the volume ratio of the increase due to water absorption was calculated and found to be 72% by volume.

From the above results, it can be seen that the inorganic fiber sheet 2 used in the present invention does not have too high tensile strength as compared with commercially available greening mats and has improved water absorption.

Example 2: The inorganic fiber sheet 2 used in Example 1 was analyzed for fertilizer components effective for turfgrass according to the fertilizer analysis method.

(1) Water-soluble component 5 g of a crushed sample of the inorganic fiber sheet 2 was added to 400 g of pure water.
Table 1 shows the elution amount of each component (however, elements other than K and B) when ml was added and reacted at 30 ° C. for 30 minutes under stirring. Table 1 shows the elution amounts of K and B when 200 ml of pure water was added to 2.5 g of the pulverized sample of the inorganic fiber sheet 2 and the reaction was performed for 15 minutes while heating and boiling.

(2) Soluble component 1 g of a crushed sample of the inorganic fiber sheet 2 is added to 100 g of citric acid.
g was dissolved in water to make 1000 ml, 150 ml of a citric acid solution (about 2%) prepared by diluting this 5 times was added, and the elution amount of each component when reacted for 1 hour at 30 ° C. under stirring It shows in Table 1.

(3) Acid-Soluble Component 150 g of 0.5 M hydrochloric acid was added to 1 g of a pulverized sample of the inorganic fiber sheet 2 and the amount of each component eluted (Ca, Elements other than Mg) are shown in Table 1. Table 1 shows the elution amounts of Ca and Mg when 200 Mml of 0.5 M hydrochloric acid was added to 2.5 g of the pulverized sample of the inorganic fiber sheet 2 and the mixture was reacted under heating and boiling for 5 minutes.

Comparative Example 2: As a sheet 2, a commercially available mat for greening (polyester nonwoven fabric for plant cultivation: Germguard manufactured by Toyobo Co., Ltd .: Germ Guard) was used in the same manner as in Example 2 except that the same test method was used. When fertilizer components were analyzed for the same test items, all fertilizer components were below the detection limit.

From the above results, it can be seen that the inorganic fiber sheet 2 used in the present invention has a fertilizer effect on turfgrass as compared with commercially available greening mats. In particular, turfgrass has been shown to be rich in soluble silicic acid content, which is required in relatively large amounts.

[0028]

[Table 1] Note: Expressed as the amount eluted from 1 g of the sample (unit: mg / l). In addition, N. D shows the detection limit (10) or less.

Example 3: The field was smoothed with a roller and a sand layer having a thickness of several centimeters was provided on the top of the field as natural ground, and seeds were propagated on an inorganic fiber sheet molded from the same rock wool as in Example 1. The Western grass of the system was sown, and the top soil was covered with a grained soil with a thickness of about 5 mm. The resulting turfgrass growing bed was watered once a day. A part of the lawn grown after 6 months was cut into a piece having a width of 35 cm and a thickness of about 1 cm using a sword cutter, and transplanted on the natural ground in another part of the field. Three
When a part of the grass was dug up after a week and the growth condition was investigated, the turfgrass had been successfully rooted in the natural ground. After that, it continued to grow steadily.

The turfgrass growing bed of this example is used as upholstered turf, and an example in which it can be excavated from a field and transferred to a natural ground at another place when rooting of turfgrass has progressed to some extent It is shown. Further, the turfgrass growing floor can be cut into an appropriate size with a cutter, and can be easily matched with the ground surface area at the site such as a slope where the lawn is planted. Further, since it is possible to cut the cup, it is easy to replace the grass such as a green on a golf course.

[0031]

As described above, according to the present invention, it is possible to easily create a growing environment necessary for growing grass. In addition, the basic inorganic fiber sheet has a good compatibility with the natural ground and topsoil, and even if there is some amount of precipitation, the topsoil is tied up and its outflow is prevented. Moreover, since the inorganic fiber sheet gradually weathers and decomposes and integrates with the soil, there is no foreign substance left in the soil unlike the case where a synthetic fiber sheet is used. It will be possible to reconstruct the greening plants.

[Brief description of drawings]

FIG. 1 shows a growing bed in Example 1.

[Explanation of symbols]

1 Natural ground 2 Inorganic fiber sheet 3 Topsoil 4 Turfgrass seedling

Claims (1)

Claims: 1. A non-woven fabric laid on a natural ground or a constructed ground, and a top soil overlaid on the non-woven fabric. The non-woven fabric is composed of an inorganic fiber and a flexible binder resin. A turfgrass growing bed characterized by comprising fibers, mixed and heat-molded, and comprising turfgrass seeds or vegetative propagules added to the non-woven fabric or the topsoil.