JP5615625B2 - Anti-germination of aquatic plants - Google Patents

Anti-germination of aquatic plants Download PDF

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JP5615625B2
JP5615625B2 JP2010187005A JP2010187005A JP5615625B2 JP 5615625 B2 JP5615625 B2 JP 5615625B2 JP 2010187005 A JP2010187005 A JP 2010187005A JP 2010187005 A JP2010187005 A JP 2010187005A JP 5615625 B2 JP5615625 B2 JP 5615625B2
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magnesium oxide
oxide powder
germination
bottom mud
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一三 明石
一三 明石
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Ube Material Industries Ltd
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/06—Aluminium; Calcium; Magnesium; Compounds thereof
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00—Protecting plants
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/12—Powders or granules
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N25/00—Biocides, pest repellants or attractants, or plant growth regulators, characterised by their forms, or by their non-active ingredients or by their methods of application, e.g. seed treatment or sequential application; Substances for reducing the noxious effect of the active ingredients to organisms other than pests
    • A01N25/34—Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K17/00—Soil-conditioning materials or soil-stabilising materials
    • C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
    • C09K17/48—Organic compounds mixed with inorganic active ingredients, e.g. polymerisation catalysts
    • C09K17/50—Organic compounds mixed with inorganic active ingredients, e.g. polymerisation catalysts the organic compound being of natural origin, e.g. cellulose derivatives

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Dentistry (AREA)
  • Plant Pathology (AREA)
  • Pest Control & Pesticides (AREA)
  • Zoology (AREA)
  • Agronomy & Crop Science (AREA)
  • Toxicology (AREA)
  • Materials Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Catching Or Destruction (AREA)

Description

本発明は、抽水植物、浮葉植物及び沈水植物などの淡水水域の底泥に根を張る水生植物の発芽防止剤、及び水生植物の発芽防止方法に関する。   TECHNICAL FIELD The present invention relates to a germination inhibitor for aquatic plants rooted in the bottom mud of freshwater bodies such as water-drawn plants, floating leaf plants, and submerged plants, and a method for preventing germination of aquatic plants.

河川や湖沼などの淡水水域において、水生植物は水中や底泥中のリンや窒素などの栄養塩を吸収して繁茂することから、アオコの発生を抑える効果があるとされている。   In freshwater bodies such as rivers and lakes, aquatic plants grow by absorbing nutrients such as phosphorus and nitrogen in the water and bottom mud.

しかしながら、水生植物が異常繁茂すると、腐敗による悪臭の発生（生活への悪影響）、船舶の航行障害、漁業障害（漁場環境の悪化）、湖底環境の悪化（泥化、貧酸素化）、生態系への悪影響という様々な問題が発生する。   However, when aquatic plants overgrow, the generation of bad odor due to decay (adverse effects on life), ship navigation problems, fishing problems (deterioration of fishing ground environment), lake bottom environment deterioration (mudification, hypoxia), ecosystem Various problems such as adverse effects occur.

淡水水域に繁茂した水生植物の除去方法としては、水生植物を刈り取る方法がある。しかし、この方法は多大な労力が必要となり、また刈り取った水生植物の処理が必要となるという問題がある。   As a method for removing aquatic plants that have flourished in freshwater bodies, there is a method for cutting aquatic plants. However, this method requires a lot of labor and has a problem that it requires treatment of harvested aquatic plants.

特許文献１は地面の雑草の繁殖を防止する方法として、地面を硬化させる方法が記載されている。この特許文献１には地面を硬化させる方法として、酸化マグネシウムを含む雑草繁殖防止材を地面に供給し、雑草繁殖防止材と土壌とを撹拌して混合した後、土壌に散水して、土壌に混合した酸化マグネシウムを水と反応させて硬化させる方法が記載されている。   Patent Document 1 describes a method for hardening the ground as a method for preventing the propagation of weeds on the ground. In Patent Document 1, as a method of curing the ground, weed growth prevention material containing magnesium oxide is supplied to the ground, and the weed reproduction prevention material and the soil are stirred and mixed, then sprinkled on the soil, A method for curing mixed magnesium oxide by reacting with water is described.

特開２００３−４７３８８号公報JP 2003-47388 A

前記特許文献１に記載にされている地面を硬化させる方法は地面の雑草の繁殖を防止する方法としては有用であるが、淡水水域の底泥には、種々の生物が生息しているため、淡水水域の底泥を硬化させると、淡水水域の生態系に悪影響を与える恐れがある。
従って、本発明の目的は、淡水水域の底泥を硬化させずに水生植物の発芽を防止できる方法、及びその水生植物の発芽防止に有用な水生植物の発芽防止剤を提供することにある。 The method of hardening the ground described in Patent Document 1 is useful as a method of preventing the propagation of weeds on the ground, but various organisms inhabit the bottom mud of freshwater bodies, Curing the bottom mud of freshwater bodies can adversely affect freshwater ecosystems.
Accordingly, an object of the present invention is to provide a method capable of preventing germination of an aquatic plant without hardening the bottom mud of freshwater bodies, and an aquatic plant germination inhibitor useful for preventing germination of the aquatic plant.

本発明者は、粒子径が１ｍｍ以下の酸化マグネシウム粉末を淡水水域の底泥に散布すると底泥を硬化させずに、水生植物の発芽を防止できることを見出した。   The present inventor has found that when a magnesium oxide powder having a particle diameter of 1 mm or less is sprayed on the bottom mud of freshwater bodies, germination of aquatic plants can be prevented without hardening the bottom mud.

従って、本発明は、粒子径が１ｍｍ以下の酸化マグネシウム粉末を含む、淡水水域の底泥に根を張る水生植物の発芽防止剤にある。   Therefore, this invention exists in the germination inhibitor of the aquatic plant rooted in the bottom mud of freshwater water area containing the magnesium oxide powder whose particle diameter is 1 mm or less.

本発明の水生植物の発芽防止剤の好ましい態様は、次の通りである。
（１）酸化マグネシウム粉末が、粒子径が１ｍｍ以下の粒子を８０質量％以上含む。
（２）酸化マグネシウム粉末が、粒子径が０．７５ｍｍ以下の粒子を８０質量％以上含む。
（３）酸化マグネシウム粉末が、２．１０ｇ／ｃｍ3以上の見掛け密度を示す。
（４）酸化マグネシウム粉末が、硬焼酸化マグネシウム粉末もしくは電融酸化マグネシウム粉末である。
（５）水生植物がヒシ科植物である。 Preferred embodiments of the aquatic plant germination inhibitor of the present invention are as follows.
(1) The magnesium oxide powder contains 80% by mass or more of particles having a particle size of 1 mm or less.
(2) The magnesium oxide powder contains 80% by mass or more of particles having a particle size of 0.75 mm or less.
(3) The magnesium oxide powder has an apparent density of 2.10 g / cm 3 or more.
(4) The magnesium oxide powder is a hard-burned magnesium oxide powder or an electrofused magnesium oxide powder.
(5) The aquatic plant is a Chrysomelidae plant.

本発明はさらに、淡水水域の底泥に上記本発明の水生植物の発芽防止剤を散布する、抽水植物、浮葉植物及び沈水植物などの淡水水域の底泥に根を張る水生植物の発芽防止方法にもある。   The present invention further provides a method for preventing germination of aquatic plants rooted in the bottom mud of freshwater bodies such as water-drawn plants, floating leaf plants and submerged plants, by spraying the germination inhibitor of the aquatic plants of the present invention on the bottom mud of freshwater bodies. There is also.

本発明の水生植物の発芽防止剤を、淡水水域の底泥に散布することによって、淡水水域の底泥に根を張る水生植物、特にヒシ科植物の発芽を効率良く防止することができる。   By spraying the germination inhibitor for aquatic plants of the present invention on the bottom mud of freshwater bodies, it is possible to efficiently prevent germination of aquatic plants rooted in the bottom mud of freshwater bodies, in particular, Apiaceae plants.

実施例１の透明プラスチックケースを上方から撮影した写真である。It is the photograph which image | photographed the transparent plastic case of Example 1 from upper direction. 比較例１の透明プラスチックケースを上方から撮影した写真である。It is the photograph which image | photographed the transparent plastic case of the comparative example 1 from upper direction.

本発明の発芽防止剤は、粒子径が１ｍｍ以下である比較的微細な酸化マグネシウム粉末を含む。酸化マグネシウム粉末の平均粒子径は、０．７５ｍｍ以下であることが好ましく、０．０３〜０．５ｍｍの範囲にあることがさらに好ましい。酸化マグネシウム粉末の見掛け密度（あるいは嵩密度）は、２．１０ｇ／ｃｍ3以上であることが好ましく、３．１０〜３．５６ｇ／ｃｍ3の範囲にあることがより好ましく、３．１０〜３．５０ｇ／ｃｍ3の範囲にあることがさらに好ましく、３．１５〜３．３０ｇ／ｃｍ3の範囲にあることが特に好ましい。酸化マグネシウム粉末の見掛け密度は、アルキメデスの原理に基づく気相置換法により測定することができる。 The germination inhibitor of the present invention contains relatively fine magnesium oxide powder having a particle size of 1 mm or less. The average particle diameter of the magnesium oxide powder is preferably 0.75 mm or less, and more preferably in the range of 0.03 to 0.5 mm. The apparent density (or bulk density) of the magnesium oxide powder is preferably 2.10 g / cm 3 or more, more preferably in the range of 3.10 to 3.56 g / cm 3 , and 3.10 to 3 more preferably in the range of .50g / cm 3, and particularly preferably in the range of 3.15~3.30g / cm 3. The apparent density of the magnesium oxide powder can be measured by a gas phase substitution method based on Archimedes' principle.

本発明の発芽防止剤で用いる酸化マグネシウム粉末は、粒子径が１ｍｍよりも大きい粗大な粒子を含んでいてもよい。但し、酸化マグネシウム粉末は、粒子径が１ｍｍ以下の微細な粒子を８０質量％以上含有していることが好ましく、９０質量％以上含有することが特に好ましい。さらに、酸化マグネシウム粉末は、粒子径が０．７５ｍｍ以下の粒子を８０質量％以上含有していることが好ましく、９０質量％以上含有することが特に好ましい。また、粒子径が０．００５ｍｍよりも大きい粒子を８０質量％以上含有していることが好ましく、９０質量％以上含有することが特に好ましい。   The magnesium oxide powder used in the germination inhibitor of the present invention may contain coarse particles having a particle size larger than 1 mm. However, the magnesium oxide powder preferably contains 80% by mass or more, and particularly preferably 90% by mass or more, of fine particles having a particle diameter of 1 mm or less. Further, the magnesium oxide powder preferably contains 80% by mass or more of particles having a particle diameter of 0.75 mm or less, and particularly preferably 90% by mass or more. Moreover, it is preferable to contain 80 mass% or more of particle | grains whose particle diameter is larger than 0.005 mm, and it is especially preferable to contain 90 mass% or more.

本発明の発芽防止剤で用いる酸化マグネシウム粉末は、硬焼酸化マグネシウム粉末及び電融酸化マグネシウム粉末であることが好ましい。   The magnesium oxide powder used in the germination inhibitor of the present invention is preferably a hard-burned magnesium oxide powder and an electrofused magnesium oxide powder.

本発明において、硬焼酸化マグネシウム粉末は、水酸化マグネシウム及び炭酸マグネシウムなどのマグネシウム化合物を９００℃以上、好ましくは１６００℃以上の温度、特に好ましくは１７００〜２１００℃の温度で焼成して得られる酸化マグネシウム焼成物を、そのままあるいは粉砕処理した後、篩などの通常の分級により粒度を調整する方法により製造したものをいう。   In the present invention, the hard-burned magnesium oxide powder is obtained by baking a magnesium compound such as magnesium hydroxide and magnesium carbonate at a temperature of 900 ° C. or higher, preferably 1600 ° C. or higher, particularly preferably 1700 to 2100 ° C. This refers to a magnesium fired product produced by a method of adjusting the particle size as it is or after pulverization, and then by ordinary classification such as a sieve.

本発明において、電融酸化マグネシウム粉末は、酸化マグネシウム、もしくは水酸化マグネシウム及び炭酸マグネシウムなどのマグネシウム化合物を電融して得られる酸化マグネシウム溶融固化物を、そのままあるいは粉砕処理した後、篩などの通常の分級により粒度を調整する方法によって製造したものをいう。   In the present invention, the electrofused magnesium oxide powder is usually magnesium oxide or a magnesium oxide melt-solidified product obtained by electromelting a magnesium compound such as magnesium hydroxide and magnesium carbonate as it is or after pulverization, and is usually used as a sieve or the like. Manufactured by a method of adjusting the particle size by classification.

硬焼酸化マグネシウム粉末及び電融酸化マグネシウム粉末の製造原料として用いる水酸化マグネシウムの例としては、海水、もしくはマグネシウム塩を含む苦汁やブラインに、消石灰を加えて析出させた水酸化マグネシウムを乾燥することによって得られた水酸化マグネシウム粉末を挙げることができる。炭酸マグネシウムの例としては、天然のマグネサイトを挙げることができる。また、電融酸化マグネシウム粉末の製造原料として用いる酸化マグネシウムの例としては、軽焼酸化マグネシウム粉末、硬焼酸化マグネシウム粉末、及びマグネシアクリンカーを挙げることができる。   Examples of magnesium hydroxide used as a raw material for producing hard-fired magnesium oxide powder and electrofused magnesium oxide powder include drying hydrated magnesium hydroxide precipitated by adding slaked lime to seawater or bitter juice or brine containing magnesium salt. The magnesium hydroxide powder obtained by (1) can be mentioned. Examples of magnesium carbonate include natural magnesite. Examples of magnesium oxide used as a raw material for producing electrofused magnesium oxide powder include light-burned magnesium oxide powder, hard-burned magnesium oxide powder, and magnesia clinker.

酸化マグネシウム焼成物及び酸化マグネシウム溶融固化物は、嵩密度が２．１０ｇ／ｃｍ3以上であることが好ましく、３．１０〜３．５０ｇ／ｃｍ3の範囲にあることがより好ましく、３．１０〜３．３０ｇ／ｃｍ3の範囲にあることが特に好ましい。なお、酸化マグネシウム焼成物や酸化マグネシウム溶融固化物の嵩密度は、媒体にケロシンを用いたアルキメデス法により測定することができる。 Magnesium oxide calcined product and magnesium oxide melt solidified product, it is preferable that a bulk density of 2.10 g / cm 3 or more, more preferably in the range of 3.10~3.50g / cm 3, 3.10 It is especially preferable that it is in the range of ˜3.30 g / cm 3 . The bulk density of the magnesium oxide fired product or the magnesium oxide melt-solidified product can be measured by the Archimedes method using kerosene as the medium.

本発明の発芽防止剤を淡水水域の底泥に散布することによって、抽水植物（例えば、ヨシ、ガマ、ハス、マコモ、フトイ、コウホネ）、浮葉植物（例えば、ヒシ、オオオニバス、ヒツジグサ、ヒルムシロ）及び沈水植物（例えば、セキショウモ、クロモ、ホザキノフサモ、エビモ、シャジクモ）などの淡水水域の底泥に根を張る水生植物の発芽を防止することができる。   By spraying the germination inhibitor of the present invention on the bottom mud of freshwater bodies, water-extracted plants (for example, reeds, catfish, lotus, macomo, futoi, kohone), floating-leafed plants (for example, horse chestnuts, giant crabs, sheep rushes, hirumiro) and It is possible to prevent germination of aquatic plants that take root in the bottom mud of freshwater bodies such as submerged plants (for example, blossoms, chromo, Hosakinofusamo, shrimp, squirrel spider).

発芽防止剤の散布量は、底泥１ｍ2の面積に対して、好ましくは０．１〜１０ｋｇの範囲、特に好ましくは０．５〜５ｋｇの範囲である。発芽防止剤の散布時期は、水生植物の発芽が始まる時期の１週間〜３ヶ月前であることが好ましい。 The application amount of the germination inhibitor 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 of the bottom mud. The spraying time of the germination inhibitor is preferably 1 week to 3 months before the start of germination of the aquatic plant.

発芽防止剤の散布方法に特には制限はない。例えば、発芽防止剤を粉末の状態で淡水水域の水面に散布してもよいし、発芽防止剤を水に分散させた分散液の状態で淡水水域の水中に注入してもよい。   There are no particular restrictions on the method of spraying the germination inhibitor. For example, the germination inhibitor may be sprayed on the surface of the freshwater body in a powder state, or may be injected into the water of the freshwater body in the form of a dispersion in which the germination inhibitor is dispersed in water.

淡水水域に散布された発芽防止剤は、淡水水域中を沈降して底泥の表面に速やかに到達する。底泥の表面に到達した発芽防止剤（酸化マグネシウム粉末）は微細な粉末であるため、速やかに水に溶解して周囲の底泥を弱アルカリ性に変質させると共に、溶解したマグネシウムイオンは底泥周囲のリン化合物と反応して、難溶性のリン酸マグネシウムを生成する。底泥を弱アルカリ性に変質させ、さらに底泥周囲のリン化合物を難水溶性のリン酸マグネシウムとして固定することによって、水生植物の発芽防止が効果的に抑制される。   The germination inhibitor sprayed in the freshwater body sinks in the freshwater body and quickly reaches the surface of the bottom mud. The germination inhibitor (magnesium oxide powder) that has reached the surface of the bottom mud is a fine powder, so it quickly dissolves in water, transforming the surrounding bottom mud into weak alkalinity, and the dissolved magnesium ions around the bottom mud. Reacts with a phosphorus compound to form a poorly soluble magnesium phosphate. By changing the bottom mud to weak alkaline and further fixing the phosphorus compound around the bottom mud as poorly water-soluble magnesium phosphate, germination prevention of aquatic plants is effectively suppressed.

［実施例１］
ヒシが繁茂している湖の底泥と湖水とを採取して、透明プラスチックケース（縦１８ｃｍ×横３０ｃｍ×高さ２３ｃｍ）に底泥の深さが約３ｃｍ、湖水の深さが約９ｃｍとなるように入れた。次いで、硬焼酸化マグネシウム粉末（粒子径：０．７５ｍｍ以下、見掛け密度：３．２３ｇ／ｃｍ3）５４ｇ（底泥１ｍ2の面積あたりの量で１ｋｇ）を底泥全体に均一に堆積するように散布して、静置した。図１に、３週間経過後の透明プラスチックケースを上方から撮影した写真を示す。図１に示すように、３週間経過後でもヒシは発生しなかった。また、３週間経過後の底泥をガラス棒で突いたところ、底泥は硬化していなかった。 [Example 1]
The bottom mud and the lake water of the lake where the eagles grow are collected, and the depth of the bottom mud is about 3cm and the depth of the lake water is about 9cm in a transparent plastic case (length 18cm x width 30cm x height 23cm). I put it to be. Next, 54 g of hard-burned magnesium oxide powder (particle diameter: 0.75 mm or less, apparent density: 3.23 g / cm 3 ) (1 kg in an amount per 1 m 2 of bottom mud) is uniformly deposited on the entire bottom mud. Sprinkled on and left to stand. FIG. 1 shows a photograph of the transparent plastic case taken from above after 3 weeks. As shown in FIG. 1, no tears occurred even after 3 weeks. Moreover, when the bottom mud after three weeks passed with the glass rod, the bottom mud was not hardened.

［比較例１］
酸化マグネシウム粉末を散布しなかったこと以外は実施例１と同様にして、透明プラスチックケースに底泥と湖水とを入れて静置した。図２に、３週間経過後の透明プラスチックケースを上方から撮影した写真を示す。図２に示すように、３週間経過後にはヒシが繁茂していた。 [Comparative Example 1]
Except that the magnesium oxide powder was not sprayed, the bottom mud and lake water were placed in a transparent plastic case in the same manner as in Example 1 and allowed to stand. FIG. 2 shows a photograph of the transparent plastic case taken from above after 3 weeks. As shown in FIG. 2, the eagles grew after three weeks.

Claims (7)

粒子径が１ｍｍ以下の粒子を８０質量％以上含有する酸化マグネシウム粉末を含む、淡水水域の底泥に根を張る水生植物の発芽防止剤。 A germination inhibitor for aquatic plants rooted in the bottom mud of freshwater bodies, comprising magnesium oxide powder containing particles having a particle size of 1 mm or less in an amount of 80% by mass or more . 酸化マグネシウム粉末が、粒子径が０．７５ｍｍ以下の粒子を８０質量％以上含む請求項１に記載の水生植物の発芽防止剤。 The aquatic plant germination inhibitor according to claim 1, wherein the magnesium oxide powder contains 80% by mass or more of particles having a particle diameter of 0.75 mm or less . 酸化マグネシウム粉末が、２．１０ｇ／ｃｍ 3 以上の見掛け密度を示す請求項１に記載の水生植物の発芽防止剤。 The aquatic plant germination inhibitor according to claim 1, wherein the magnesium oxide powder exhibits an apparent density of 2.10 g / cm 3 or more . 酸化マグネシウム粉末が、硬焼酸化マグネシウム粉末もしくは電融酸化マグネシウム粉末である請求項１に記載の水生植物の発芽防止剤。 The aquatic plant germination inhibitor according to claim 1, wherein the magnesium oxide powder is hard-burned magnesium oxide powder or electrofused magnesium oxide powder . 水生植物がヒシ科植物である請求項１に記載の水生植物の発芽防止剤。 The aquatic plant germination inhibitor according to claim 1, wherein the aquatic plant is a Coriaceae plant. 淡水水域の底泥に請求項１乃至５のうちのいずれかの項に記載の水生植物の発芽防止剤を散布する、淡水水域の底泥に根を張る水生植物の発芽防止方法。A method for preventing germination of an aquatic plant rooted in the bottom mud of a freshwater body, comprising spraying the germination inhibitor of an aquatic plant according to any one of claims 1 to 5 on the bottom mud of a freshwater body. 水生植物の発芽防止剤の散布量が、底泥１ｍSprinkling amount of aquatic plant germination inhibitor is 1m of bottom mud 22 の面積に対して０．１〜１０ｋｇの範囲にある請求項６に記載の水生植物の発芽防止方法。The method for preventing germination of aquatic plants according to claim 6, which is in a range of 0.1 to 10 kg with respect to the area of the aquatic plant.
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