JPS60250087A - Material for tree planting - Google Patents

Abstract

PURPOSE:To provide a material for tree planting consisting of hydrophilic urethane rubber, which has high water permeability, water retention characteristics and a specified water absorptivity and is effective for mixing into soil and other materials for tree planting. CONSTITUTION:The material consists of hydrophilic urethane rubber in powder, granules, pieces, strips, blocks, etc. having high water permeability, water retention characteristics and a water absorptivity of 1,300% or higher. The water absorptivity is measured by immersing a specimen in water for 24hr, leaving the taken-out specimen for 30min and calculating the percentage of its weight to the original weight. For practical use, the type of the material is selected according to purpose. In land reclamation work, for example, it is mechanically mixed into soil pumped from sea bed and heaped up on the shore and reduces the salt content of the soil in a relatively short hours to a level not to have any adverse effect upon germination and growth of plants. At the same time, it facilitates air flow within soil and retains absorbed water, thus promoting growth of plants.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention can be used for soil improvement when revegetating land that is difficult to revegetate, such as coastal reclaimed land, poor land, and dry land, and for spraying afforestation work. The present invention relates to a greening material that is useful when mixed with spraying greening materials, or used as a material for vegetation bags or as a substitute for sphagnum moss for gardening.

[Conventional technology] Recently, there has been construction work to green the reclaimed land along the coast, as well as barren land.

Although construction work to revegetate dry land is actively being carried out, it is considered extremely difficult to revegetate this land. The main reasons for this are the high salt content in the soil and the difficulty in air circulation in the soil during greening work on reclaimed land on the coast. Therefore, in order to green coastal reclaimed land, the first step is to reduce the salt content in the land to a level that does not affect the germination and growth of plants, and to improve water permeability and water retention to remove air in the soil. It is necessary to make the soil easy to distribute, and it is also necessary to make the soil water absorbent.

However, in general, when reclamation is carried out on the coast, a method is adopted in which the soil from the seabed is sucked up and deposited using a sand pump, and since the soil is mainly composed of sludge, which is minute soft mud, and has a tight physical structure, it is not permeable. Because of its poor functionality and poor drainage, it takes a long time to reduce the salt content in the soil, and it is extremely difficult for air to circulate through the soil.

In addition, greening of poor or dry land is often done by embanking the land, but poor and dry land originally lacks water-retaining ability, and it is extremely difficult to achieve complete greening even with embankment. Have difficulty.

Furthermore, spray greening work is carried out to green the slopes of roads, but this spray greening work uses plant growth agents.

The greening material is made by adding a neutralizing agent to the vegetation base material consisting of a land improvement agent, live seeds, and soil, and then adding water to turn it into a muddy material, which is then sprayed onto the slope of the road. Without a water-retaining function, there is a risk of dryness and lack of greening. In particular, when greening the slope of a road, the layer of concrete 1 formed on the slope does not have a large thickness, so only the surface is greened, which has a weak point in dryness resistance.

[Problems to be Solved by the Invention] Therefore, in order to solve the above-mentioned difficulties of the conventional technology, it is necessary to use sand pumps to suck up soil from the seabed during coastal reclamation work when carrying out greening work. When the soil is raised and deposited, it has good water absorption function and water permeability.
It is necessary to mix in suitable materials that have water retention properties and can improve air circulation in the soil.In addition, for greening poor and dry areas, soil or soil to be embanked must be mixed In addition, when greening the slope of a road by spraying greening work, water-absorbing materials may be mixed into the spraying greening material that has turned into mud. It is sufficient to mix in a material that has good functionality, has water permeability and water retention, and allows good air circulation in the soil, but the selection of such a material is the biggest problem of the present invention.

[Means for Solving the Problems] From the above-mentioned viewpoints, the inventor of the present invention has accomplished the present invention as a result of intensive research on materials that should be mixed into soil and greening materials for greening. The structure of the invention is in the form of two powder particles, strips, strips, blocks, etc., with water permeability,
It is made of hydrophilic urethane rubber with good water retention and water absorption rate of 1300% or more, and is characterized by being mixed into soil, greening materials, etc.

In addition, the water absorption rate mentioned above is the percentage of the weight measured 30 minutes after a sample of hydrophilic urethane rubber is immersed in water for 24 hours and taken out, relative to the original weight.

[Function] The greening material of the present invention is made of wood-loving urethane with high water permeability and water retention in the form of two powder particles, strips, strips, or blocks. In coastal reclamation work, when sand pumps are used to suck up soil from the seabed and deposit it, it is possible to mix it mechanically into the soil.

Due to good water permeability, salt in the soil is smoothly discharged, and in a relatively short period of time, the salt content in the soil is reduced to a limit that does not affect the germination and growth of M substances, and the air in the soil is The water can be easily distributed and water absorbed in the soil can be retained, making it suitable for plant growth.

In addition, when using the material of the present invention for greening poor land or dry central areas, it should be mixed into the soil for embankment, and when the soil is excavated without embankment and the afforestation material is mixed into the soil. By mixing it into the soil together with afforestation materials, it absorbs water well when water is supplied and retains the water, which improves the growth of plants and facilitates afforestation.

Furthermore, when using the material of the present invention for greening construction by spraying greening work, if the material of the present invention is mixed in an appropriately shaped greening material for spraying and sprayed, the material absorbs water. It retains water well in its natural state, allowing for good plant growth.

[Experiment example 1 piece Next, an experimental example of the present invention will be explained.

As the soil for the experiment, sludge with a salt content of 3.15% collected from a coastal reclamation construction site in Urayasu City, Chiba Prefecture was used. Then, open the bottom of a synthetic resin bottle with a diameter of 7.7 cm and a height of 15 cm, turn the mouth of the bottle downward, and line it with gauze and net so that the water can seep out. Then, add sand to a thickness of 3 cm. The sludge 31o1 was then dissolved in water and packed in three test plots, with the pure sludge plot as a control plot.

The material of the present invention used in this experiment was in powder form and had a water absorption rate of 18.
It was 35%.

(1) Pure sludge area (control area) (2) Area mixed with 3o volume% of tree-friendly urethane rubber (3) Area mixed with 5o volume% of hydrophilic urethane rubber After leaving the above test area for one day, Pour 50ml of distilled water into the
Every time it leaches out from the bottom of the container, 50ml of distilled water is added, and the soil salt content is reduced to 0.025%.
When we investigated the period and water permeability until the water permeability decreased, we found that area (3) was the fastest in the above period, followed by area (2) and area (1).
), and the water permeability was also in the same order as the control plot.

Through this experiment, it was found that when the material of the present invention is mixed, the water permeation rate is high and the water permeation function is high, and the salt discharge rate in the soil is also the same. That is, since the material of the present invention contains air, the water permeability of the soil is enhanced and the salt content is reduced.

[Experiment Example 2 Regarding plant growth A: When the soil moisture content is high The soil for the experiment was the same as that used in Experiment Example 1, but desalinated and dissolved in water (salt content 0.0125%)
was used. Then, gauze was stretched on the bottom of a vinyl chloride pipe with a diameter of 8.3 cm and a length of 15 cm, and the gauze was filled with the above-mentioned Hetoro.
I created a ward.

(1) Pure sludge area (control area) (2) Area mixed with 30% hydrophilic urethane rubber (3) Area mixed with 50% hydrophilic urethane rubber 100 grains of perennial ryegrass were sown in each of the above test areas. After growing for one month, their growth was compared and the results are shown in Table 1.

Table 1 8 When a suitable soil moisture content is maintained As the soil for the experiment, the same desalinated and dried sludge (salt content 0.0125%) used in case A was used. The sludge was firmly compacted in a glass pot with a diameter of 9.8 cm and a height of 15 cm as a control group, and the other test plots were prepared in which the sludge was mixed with the material of the present invention and firmly compacted as follows. (1) pure sludge area (control area), (2) area containing 1130% hydrophilic urethane rubber, and (3) area containing 50% hydrophilic urethane rubber. Table 2 shows the results of sowing 91,100 seeds of Eve 91 and comparing the growth after 40 days of indoor growth, with an appropriate amount of watering every 3 days to prevent excessive drying.

Table 2 C: Lower soil moisture content The same sludge as used in B was used as the soil for the experiment. Then, we created the same test plots as in case B, sowed 100 grains of perennial ryegrass in them, allowed them to grow indoors, and after 40 days had passed without supplying total heat water after germination, we compared their growth9. It was as shown in Table 3.

Table 3 From the above experiments, there was no significant difference in plant height between the control plot and other experimental plots, but in terms of root length, in the case of B and C, the higher the contamination rate, the longer the roots. It was found that the control plot was the shortest, and the difference was particularly significant when C, that is, the soil moisture content was lowered. This is considered to prove that the material of the present invention retains moisture well. In addition, there was no significant difference in root length in A because the soil moisture content was kept high.
This is thought to be due to the fact that the amount of air in the soil was approximately constant regardless of whether or not the present invention material was mixed.

The above experiments showed that even in coastal reclaimed land where sludge is the main ingredient, if the present invention material is mixed into the soil, the salt content of the soil will gradually settle to the bottom due to rainfall, resulting in a significant increase in the salt content of the soil. It has been revealed that as the soil temperature decreases quickly, air circulation in the soil becomes easier, making it possible to revegetate in a short period of time.

[Experiment Example 3] When embanking poor land to revegetate the land, a plot was prepared in which a plant growth agent and plant seeds were mixed into the soil to be embanked, and a plot in which 30% by volume of the powdered material of the present invention was mixed with them. When two plots were created and the growth status of the plants was observed, it was found that the latter, that is, the plot containing the material of the present invention showed superior growth.

This is considered to be the result of good air circulation in the soil in the plots in which the material of the present invention was mixed, as well as good water permeability and water retention of the material of the present invention.

[Experimental Example 4] When greening a road slope, a spray greening material consisting of a plant growth agent, a land improvement agent, plant seeds, and soil was sprayed on the slope, and 30% of the present invention material was applied to the greening material. When plots were sprayed with the mixture containing % by volume and the growth status of each plant was observed, the latter plot showed superior growth compared to the former.

This is considered to be a result of the same reason as in Experimental Example 3 described above.

[Effects of the Invention] As clarified by the above experimental examples, when the material of the present invention is mixed into soil or greening materials in an appropriate amount, water permeates and retains water well in the soil or greening materials, and as a result, plants It is suitable as a material for greening because it improves the growth of trees.

In addition, in the above experimental examples, powdered material was used, but 1
It may be in the form of grains, strips, strips, blocks, etc., and should be selected as appropriate depending on the purpose of use.

For example, sphagnum moss is usually used in gardening for orchids and odontocetes, but this sphagnum moss corrodes in about a year, so it must be replaced approximately every year. If you forget to water and let it dry, it loses its water absorbency and becomes unusable and you have to replace it with a new one, which takes a lot of effort, but if the material of the present invention is used in place of the sphagnum moss, it will not corrode. There is no such thing, and if you water it once it dries, it absorbs and retains water well, so not only does gardening require less effort, but it also has excellent water retention properties.
Good cultivation can be expected.

Agent Yoshikuni Koizumi

Claims (1)

[Claims] ■ It is made of hydrophilic urethane rubber that has a water absorption rate of 1300% or more and has good water permeability and water retention in the form of powder, strips, strips, blocks, etc., and is not recommended for use when mixed into soil, greening materials, etc. Characteristic greening materials.