KR101661643B1 - Agent for preventing germination of aquatic plants - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for preventing germination of aquatic plants rooted in the bottom mud of fresh water bodies, such as harvest plants, side plants and submerged plants, without hardening the bottom clay of the freshwater bodies.
(Solution) The magnesium oxide powder having a particle diameter of 1 mm or less is dispersed in the bottom clay of the freshwater body.

Description

TECHNICAL FIELD [0001] The present invention relates to an antifogging agent for an aquatic plant,

The present invention relates to an agent for preventing germination of an aquatic plant rooted in bottom mud of freshwater bodies such as an extracting plant, a side plant and a submerged plant, and a method for preventing germination of aquatic plant.

In the freshwater waters such as rivers and lakes, the aquatic plants have the effect of suppressing the occurrence of blue algae in that they absorb the nutrients such as phosphorus and nitrogen in the water and bottom mud, have.

However, when an aquatic plant is abnormally tilted, the occurrence of odor due to corruption (adverse effect on life), the navigation obstacle of the ship, the obstacle of fishery (deterioration of the fishery environment), deterioration of the lake floor environment (muddy, , And adverse effects on ecosystems.

As a method for removing aquatic plants from freshwater bodies, there is a method of cutting off aquatic plants. However, this method requires a lot of effort, and there is a problem that the treatment of aquatic plants is required.

Patent Document 1 discloses a method of curing a ground as a method for preventing the propagation of weeds on the ground. Patent Document 1 discloses a method of curing a ground by supplying a weed propagation preventing material containing magnesium oxide to the ground, mixing the weed propagation preventing material and the soil with stirring and then mixing the soil with the magnesium oxide Is reacted with water to cure it.

Japanese Patent Application Laid-Open No. 2003-47388

The method of curing the ground described in Patent Document 1 is useful as a method of preventing weed propagation on the ground. However, since the bottom soil of the freshwater body contains many organisms, when the bottom soil of the freshwater body is hardened, Which may adversely affect the ecosystem of

Accordingly, an object of the present invention is to provide a method for preventing germination of aquatic plants without curing the bottom clay of freshwater bodies, and an agent for preventing germination of aquatic plants useful for preventing germination of the aquatic plants.

The present inventor has found that when magnesium oxide powder having a particle diameter of 1 mm or less is dispersed in the bottom clay of the freshwater body, germination of aquatic plants can be prevented without hardening the bottom clay.

Accordingly, the present invention is an antifogging agent for an aquatic plant that roots in the bottom mud of freshwater bodies, including magnesium oxide powder having a particle diameter of 1 mm or less.

Preferred embodiments of the germination preventing agent of an aquatic plant of the present invention are as follows.

(1) The magnesium oxide powder contains 80 mass% or more of particles having a particle diameter of 1 mm or less.

(2) The magnesium oxide powder contains not less than 80% by mass of particles having a particle diameter of 0.75 mm or less.

(3) The magnesium oxide powder exhibits an apparent density of 2.10 g / cm < 3 > or more.

(4) The magnesium oxide powder is a hard burning magnesium oxide powder or a molten iron oxide powder.

(5) Aquatic plants are plants of the blight and hydrocaryaceae family (also known as the Trapaceae family).

The present invention also relates to a method for preventing germination of aquatic plants rooted in the bottom mud of fresh water bodies such as harvest plants, side plants and submerged plants, which spray the antifogging agent of the aquatic plants of the present invention on the bottom mud of freshwater bodies .

By dispersing the germination preventing agent of the aquatic plant of the present invention in the bottom mud of the fresh water body, it is possible to effectively prevent the germination of the aquatic plant, especially the rhizome and the plant, which roots in the bottom mud of the fresh water body.

1 is a photograph of the transparent plastic case of Example 1 taken from above.
2 is a photograph of the transparent plastic case of Comparative Example 1 taken from above.

The germination preventing agent of the present invention comprises a relatively fine magnesium oxide powder having a particle diameter of 1 mm or less. The average particle diameter of the magnesium oxide powder is preferably 0.75 mm or less, more preferably 0.03 to 0.5 mm. The apparent density (or bulk density) of the magnesium oxide powder is preferably 2.10 g / cm3 or more, more preferably 3.10 to 3.56 g / cm3, further preferably 3.10 to 3.50 g / cm3 , And particularly preferably in the range of 3.15 to 3.30 g / cm < 3 >. The apparent density of the magnesium oxide powder can be measured by a vapor phase substitution method based on the principle of Archimedes.

The magnesium oxide powder used in the germination preventing agent of the present invention may contain coarse particles having a particle diameter larger than 1 mm. However, the magnesium oxide powder preferably contains 80 mass% or more of fine particles having a particle diameter of 1 mm or less, particularly preferably 90 mass% or more. In addition, the magnesium oxide powder preferably contains 80 mass% or more of particles having a particle diameter of 0.75 mm or less, more preferably 90 mass% or more. In addition, it is preferable that particles having a particle diameter larger than 0.005 mm are contained in an amount of 80 mass% or more, particularly preferably 90 mass% or more.

The magnesium oxide powder used in the germination preventing agent of the present invention is preferably a light magnesium oxide powder and a molten magnesium oxide powder.

In the present invention, the light magnesium oxide powder is a magnesium oxide fired product obtained by firing a magnesium compound such as magnesium hydroxide and magnesium carbonate at a temperature of 900 DEG C or higher, preferably 1600 DEG C or higher, particularly preferably 1700 to 2100 DEG C Is prepared as it is, or after grinding treatment, and then adjusting the particle size by conventional classification such as sieve.

In the present invention, the pre-fused magnesium oxide powder is obtained by directly or grinding the magnesium oxide fused oxide obtained by fusing a magnesium compound such as magnesium oxide or magnesium hydroxide and magnesium carbonate, And the like.

Examples of the magnesium hydroxide used as a raw material for producing the light magnesium oxide powder and the molten magnesium oxide powder include magnesium hydroxide powder obtained by drying magnesium hydroxide precipitated by adding calcium hydroxide to bitter juice or brine containing seawater or a magnesium salt . An example of magnesium carbonate is a natural magnesite. Examples of the magnesium oxide used as a raw material for producing the molten magnesium oxide powder include light-burnt magnesium oxide powder, hard-burned magnesium oxide powder, and magnesia clinker.

The magnesium oxide fired product and the magnesium oxide fused solidified product preferably have a bulk density of 2.10 g / cm 3 or more, more preferably 3.10 to 3.50 g / cm 3, and particularly preferably 3.10 to 3.30 g / desirable. The bulk density of the magnesium oxide fired product or the magnesium oxide fused solid product can be measured by the Archimedes method using kerosene as the medium.

By dispersing the germination preventing agent of the present invention in the bottom mud of fresh water body, it is possible to prevent the growth of plants such as harvest plants (for example, reeds, lotus, lotus, It is possible to prevent the germination of aquatic plants that take root in the bottom mud of freshwater bodies such as sputum and submerged plants (for example, screw, black wax, wool spur, horse mackerel, tea tree).

 The dispersing amount of the germination preventing agent is preferably in the range of 0.1 to 10 kg, particularly preferably in the range of 0.5 to 5 kg, with respect to the area of 1 m < 2 > It is preferable that the dispersing time of the germination preventing agent is one week to three months before the start of germination of aquatic plants.

There is no particular limitation on the method of dispersing the germination preventing agent. For example, the germination preventing agent may be dispersed in a powder state on the water surface of a fresh water body, or may be injected into water in a fresh water body in a dispersion state in which the germination preventing agent is dispersed in water.

Sprouting agents dispersed in freshwater bodies settle down in freshwater bodies and quickly reach the surface of the bottom mud. Since the germination preventing agent (magnesium oxide powder) reaching the surface of the bottom clay is a fine powder, it quickly dissolves in water to change the surrounding ground mud to weakly alkaline, and the dissolved magnesium ions are dissolved in the phosphorus compound To produce insoluble magnesium phosphate. The germination of aquatic plants is effectively inhibited by subjugating the bottom mud to alkalinity and further fixing the phosphorus compound around the bottom mud as hardly water-soluble magnesium phosphate.

Example

[Example 1]

The bottom mud and the water of the lake were collected and placed in a transparent plastic case (18 cm x 30 cm x 23 cm high) with the depth of the bottom mud about 3 cm and the depth of the water to about 9 cm. 54 g of a light magnesium oxide powder (particle diameter: 0.75 mm or less, apparent density: 3.23 g / cm 3) (1 kg in an area of 1 m 2 of floor mud) was dispersed uniformly over the entire floor mud, Respectively. Fig. 1 shows a photograph of the transparent plastic case after curing for three weeks, taken from above. As shown in Fig. 1, no discoloration occurred after three weeks. Also, as a result of pouring the bottom mud after three weeks hardening with a glass rod, the bottom mud was not cured.

[Comparative Example 1]

The same procedure as in Example 1 was carried out except that the magnesium oxide powder was not dispersed, and the bottom clay and the water lumps were placed in the transparent plastic case and allowed to stand. Fig. 2 shows a photograph of the transparent plastic case after three-week curing taken from above. As shown in Fig. 2, after three weeks of curing, dryness was blurred.

Claims (8)

An antifogging agent for an aquatic plant roots in a bottom mud of freshwater bodies, comprising magnesium oxide powder having a particle diameter of 1 mm or less. The method according to claim 1,
An agent for preventing germination of an aquatic plant wherein the magnesium oxide powder contains 80% by mass or more of particles having a particle diameter of 1 mm or less. The method according to claim 1,
An agent for preventing germination of an aquatic plant wherein the magnesium oxide powder contains 80% by mass or more of particles having a particle diameter of 0.75 mm or less. The method according to claim 1,
An agent for preventing germination of an aquatic plant wherein the magnesium oxide powder exhibits an apparent density of not less than 2.10 g / cm3. The method according to claim 1,
An agent for preventing germination of an aquatic plant wherein the magnesium oxide powder is a hard burned magnesium oxide powder or a molten magnesium oxide powder. The method according to claim 1,
A germicidal agent for aquatic plants in which aquatic plants are blighted and plants. A method for preventing germination of an aquatic plant roots in the bottom soil of freshwater bodies, which disperses the germination preventing agent of an aquatic plant according to any one of claims 1 to 6 in the bottom soil of freshwater bodies. 8. The method of claim 7,
A method for preventing germination of aquatic plants, wherein the amount of the germination inhibitor of the aquatic plant is in the range of 0.1 to 10 kg with respect to the area of 1 m 2 of the bottom mud.

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