JPH0684630B2 - Soil improvement sheet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a soil improvement sheet used for improving acidic soil that is harmful to the growth of plants, for example, on the greening of slopes.

[Conventional technology]

Generally, improvement of acidic soil is performed by a method of spraying powder of slaked lime or calcium carbonate and stirring with soil.

This soil improvement method dissolves powder of slaked lime and calcium carbonate in the water in the soil, and the effect of soil improvement by the neutralization reaction is exerted at an early stage, so it is very effective when greening the horizontal ground of acidic soil. Is.

However, if the construction target is a slope, not only is it difficult to mix with soil because it is difficult to construct, but slaked lime and calcium carbonate are easily washed away by rainfall, so even if short-term effects can be expected, long-term effects can be expected. It was difficult to maintain vegetation.

[Problems to be Solved by the Invention]

In view of the above-mentioned present situation, the present invention is easy to construct even on the slope, and the effect of soil improvement by the neutralization reaction is early,
Moreover, it is intended to provide a soil improvement sheet that can be continuously exerted for a long period of time.

[Means for Solving the Problems]

The technical means taken by the present invention to achieve the above object are as follows.

That is, the feature of the soil improving sheet according to the first aspect of the present invention is that a soil improving agent mixed with granular calcium carbonate having different particle diameters is sandwiched between the water-soluble sheet-shaped members on the front and back.

A feature of the soil improving sheet according to the second invention is that a coarse net is attached to the water-soluble sheet-like member on the front side of the soil improving sheet described above.

A feature of the soil improving sheet according to the third aspect of the present invention is that the water-soluble sheet-like member on one side of the soil improving sheet described above is provided with a tension grass body.

In any of the first to third inventions, it is preferable to quilt the water-soluble sheet-shaped members on the front and back sides in order to increase the amount of soil improver sandwiched between the sheet-shaped members. In addition, it is desirable for the growth of vegetation to use a soil improver mixed with a chemical fertilizer and a water retention agent. Further, vegetative seeds such as grass seeds, flower seeds and native plant seeds can be mixed and carried out.

[Action]

According to the configuration of each of the above inventions, when improving acidic soil that is harmful to plant growth, even if the target of construction is a slope, it can be easily constructed by laying a soil improvement sheet on the slope.

Then, in the state where the soil improvement sheet is laid, among the granular calcium carbonate accommodated in the recesses, the one having a small particle size is first dissolved in rainwater or water in the soil and penetrates into the soil. The soil improvement effect by the Japanese reaction is exhibited early, and the large particle size has a small surface area per unit weight and gradually elutes, so the soil improvement effect is continuously exhibited for a long time. Will be.

Further, since the front and back sheet-shaped members are both water-soluble, there is no fear of hindering the germination of vegetation seeds or the growth of roots.

According to the configuration of the second invention, by laying the soil improvement sheet, a coarse net used as a base material for the vegetation base material spraying method is also laid at the same time.

According to the configuration of the third invention, by laying the soil improvement sheet, sowing of vegetation seeds is performed at the same time.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a soil improvement sheet A according to the first invention.
This soil improvement sheet A is obtained by sandwiching a soil improvement agent 3 in which granular calcium carbonate having different particle diameters is mixed between two water-soluble sheet-shaped members 1 and 2 on the front and back. Is a mixture of granular calcium carbonate with different particle sizes, specifically, limestone was crushed and divided into particle sizes of 0.3 to 0.8 mm, 0.8 to 1.5 mm, and 1.5 to 5.0 mm. It is also possible to mix only the same amount of each, but in this embodiment, the chemical fertilizer 4 and the water retention agent 5 are further mixed. The amount of calcium carbonate to be sandwiched can be set arbitrarily, but it is practically desirable to set it to about 50 to 2000 g / m ² .

As the chemical fertilizer 4, one kind or several kinds can be appropriately selected and used from slow-acting, slow-acting, and ultra-slow-acting fertilizers. The most preferred embodiment is to use a mixture of all the above types.

As the water retention agent 5, one type or several types can be appropriately selected and used from inorganic type such as vermukilite and perlite and organic type such as bark compost and peat moss. The most preferred embodiment is to use a mixture of inorganic and organic water retention agents.

As the water-soluble sheet-shaped members 1 and 2, in addition to dispersible non-woven fabric, crepe paper, etc., as shown in FIG.
A laminate of the water-soluble film 6b and the water-soluble film 6b may be used. In this case, as the coarse net 6a, for example, a net having a large mesh (for example, 2 to 20 mm) formed by plain weaving a flat yarn of plant fiber or chemical fiber (for example, polyester or polypropylene) that is difficult to dissolve by moisture (so-called Split cloth) is used. Water-soluble film 6b
As the film may be a polymer-based or starch-based film that dissolves in water, a non-woven fabric having excellent dispersibility in which fibers are bound with a water-soluble binder (for example, a fiber having a thickness of 1.5 denier and a length of 51 mm is used. Due to the water-soluble binder such as polyvinyl alcohol, which has a low degree of polymerization,
80%, 20% binder, and combined so that the basis weight is about 23 g / m ² ).

In addition to the chemical fertilizer 4 and the water retention agent 5, the soil improver 3 may be mixed with vegetation seeds such as grass seeds, flower seeds and native plant seeds.

Next, some methods of using the soil improvement bag A will be described.

As shown in FIG. 3, on the slope 7 such as a road, the soil improvement sheet A is laid, and a coarse net 8 is stretched above it.
The vegetation base material B, which is a gel of vegetation seeds, fertilizer, water retention agent, etc., is sprayed to green the slope 7. Although not shown, the soil improvement sheet A and the coarse net 8 are fixed by driving an anchor or a peg on the slope 7.

According to the above configuration, among the granular calcium carbonate sandwiched between the water-soluble sheet-shaped members 1 and 2, those having a small particle size have a large surface area per unit weight, and the water content in rainwater or soil can be quickly obtained. Since it dissolves in water, the effect of soil improvement due to the neutralization reaction with acidic soil is exhibited early, while that of large particles gradually dissolves out, so the effect of soil improvement is exerted continuously over a long period of time. It will be.

Further, since both the sheet-shaped members 1 and 2 on the front and back are water-soluble, they do not hinder the growth of roots of vegetation seeds.

In particular, in the above-mentioned embodiment, since the soil improver 3 is mixed with the chemical fertilizer 4 and the water retention agent 5, the soil improvement bag A not only neutralizes and improves the acidic soil but also improves vegetation. It becomes a base and is very effective for greening slope 7.

FIG. 4 shows another example of use of the soil improvement sheet A described above. This example of use is characterized in that after laying the soil improvement sheet A on the slope 7, the stretched grass body C is laid on it. Although not shown, it is desirable to cover the stretched grass C with a thin layer of soil. Alternatively, conversely to the above, after the stretched grass body C is laid on the slope 7, the soil improvement sheet A may be laid above it. Here, the turf grass C is a net having a mesh that does not hinder germination or root growth, or the above-mentioned non-woven fabric having excellent dispersibility, on which vegetative seeds such as lawns are carried through a water-soluble sizing agent. say.

FIG. 5 shows a soil improvement sheet A according to the second invention. This soil improvement sheet A is characterized in that a coarse net 8 is attached to the water-soluble sheet-shaped member 1 on the front side of the soil improvement sheet shown in FIG. The rest of the configuration is the same as that of the first embodiment of the invention, so the explanation is omitted.

If this soil improvement sheet A is used, the laying process of the coarse net 8 is omitted, so that the workability can be improved.

FIG. 6 shows a soil improvement sheet A according to the third invention. This soil improvement sheet A is characterized in that the above-mentioned tension grass body C is attached to the water-soluble sheet-shaped member 1 or 2 on one side of the soil improvement sheet shown in FIG. The rest of the configuration is the same as that of the first embodiment of the invention, so the explanation is omitted.

If this soil improvement sheet A is used, the laying step for the tension grass body C will be omitted, so that the workability can be improved.

In the first to third inventions described above, as shown in FIGS. 7 to 9, the water-soluble sheet-shaped members 1 and 2 on the front and back sides are quilted to form Since the room partitioned by the seams and the like is formed, the amount of the soil improving agent 3 sandwiched between the sheet upper members 1 and 2 can be increased.

〔The invention's effect〕

Since the present invention has the above-mentioned configuration, the following effects can be obtained.

According to the claims (1) to (3), when the acidic soil harmful to the growth of the plant is improved, even if the target of the construction is a slope, the construction is simply performed by laying the soil improvement sheet. it can. In addition, since the front and back sheet-shaped members are both water-soluble, they do not hinder the germination of vegetation seeds or the growth of roots.

In particular, as the soil improver sandwiched between the water-soluble sheet-like members on the front and back, a mixture of granular calcium carbonate with different particle sizes is used, so the effect of soil improvement by the neutralization reaction is early, and It will be demonstrated for a long time.

According to claim (2), the step of laying a coarse net, which is a base material for the vegetation base material spraying method, is omitted,
Workability is improved.

According to claim (3), the step of laying the stretched grass body is omitted, and the workability is improved.

According to claim (4), the amount of the soil improving agent sandwiched between the water-soluble sheet-shaped members can be increased.

According to claim (5), since the chemical fertilizer and the water retention agent are mixed in the soil improving agent in which granular calcium carbonate having different particle diameters are mixed, the soil improving sheet and the acidic soil are neutralized and improved. Not only will it be used as a base for vegetation, it will be very effective for greening slopes.

[Brief description of drawings]

FIG. 1 is a perspective view of a soil improvement sheet showing an embodiment of the first invention, FIG. 2 is a perspective view showing an example of a water-soluble sheet-shaped member, and FIGS. 3 and 4 are the use of the soil improvement sheet, respectively. It is a schematic sectional drawing explaining an example. FIG. 5 is a perspective view of a soil improvement sheet showing an embodiment of the second invention. FIG. 6 is a perspective view of a soil improvement sheet showing an embodiment of the third invention. 7 to 9 are perspective views of soil improvement sheets showing other embodiments of the first invention to the third invention, respectively. A: soil improvement sheet, C: tension grass, 1,2 ... water-soluble sheet member, 3 ... soil improver, 4 ... chemical fertilizer, 5
…… Water retention agent, 8 …… Coarse net.

Claims (5)

[Claims] 1. A soil improving sheet comprising a soil improving agent in which granular calcium carbonate having different particle diameters are mixed, sandwiched between water-soluble sheet-like members on the front and back. 2. A soil improving agent in which granular calcium carbonate having different particle diameters is mixed is sandwiched between the water-soluble sheet-shaped members on the front and back sides, and a coarse net is attached to the water-soluble sheet-shaped members on the front side. A soil improvement sheet characterized by the above. 3. A soil improving agent in which granular calcium carbonate having different particle diameters is mixed is sandwiched between the water-soluble sheet-shaped members on the front and back sides, and a tension grass material is attached to the water-soluble sheet-shaped members on one side. Soil improvement sheet characterized by. 4. The soil improvement sheet according to any one of claims 1 to 3, wherein the water-soluble sheet-shaped members on the front and back sides are quilted. 5. The soil improving sheet according to claim 1, wherein the soil improving agent contains a chemical fertilizer and a water retention agent.