JP5940326B2 - Soil prevention method - Google Patents

Soil prevention method Download PDF

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JP5940326B2
JP5940326B2 JP2012055214A JP2012055214A JP5940326B2 JP 5940326 B2 JP5940326 B2 JP 5940326B2 JP 2012055214 A JP2012055214 A JP 2012055214A JP 2012055214 A JP2012055214 A JP 2012055214A JP 5940326 B2 JP5940326 B2 JP 5940326B2
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magnesia
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康二 宮原
康二 宮原
一三 明石
一三 明石
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康二 宮原
康二 宮原
株式会社環境マグネシア
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本発明は土壌の防草工法に係り、より詳しくは、マグネシア(酸化マグネシウム)を用いて、植物の成長に必須な元素の可給性を低下させることにより、雑草の生育を防止する土壌の防草工法に関する。 The present invention relates to a soil herbicide construction method , and more specifically, magnesia (magnesium oxide) is used to reduce the availability of elements essential for plant growth, thereby preventing soil growth. It relates to the grass method .

土壌の防草対策として、従来より、土壌表層の硬度を上げる(硬度2N/mm以上にする)ことにより雑草の根が土壌中に入り込んで定着できないようにすることが行われている。 As countermeasures against soil weeds, conventionally, it has been practiced to increase the hardness of the soil surface layer (hardness of 2 N / mm 2 or more) so that the roots of weeds enter the soil and cannot be fixed.

斯かる従来の土壌の防草対策は図7に示す工程を経て行われている。
先ず、防草対策を施す土壌の表層を所定厚さ削取し(S30)、次に、削取後の土壌の路盤整正を行う(S32)。
次に、S30で削取った土に、セメント等の固化材及び水を所定量混ぜて十分に攪拌、混合(S34)させた後、混合物を土壌表面に播いて敷均す(S36)。
次に、混合物を固めるためローラー等を用いて1次転圧を行い(S38)、その後、不陸調整(地面の凹凸修正)を行う(S40)。
次に、ローラー等を用いて2次転圧を行って(S42)、混合物を更に固めた後、散水する(S44)。この散水により、混合物中の固化材が硬化するのである。
Such conventional soil herbicidal measures are performed through the steps shown in FIG.
First, the surface layer of the soil subjected to the herbicidal measures is cut to a predetermined thickness (S30), and then the roadbed after the cutting is corrected (S32).
Next, a predetermined amount of a solidifying material such as cement and water are mixed and thoroughly stirred and mixed (S34) to the soil cut in S30, and then the mixture is sown and spread on the soil surface (S36).
Next, in order to harden the mixture, primary rolling is performed using a roller or the like (S38), and then unevenness adjustment (correction of ground irregularities) is performed (S40).
Next, secondary rolling is performed using a roller or the like (S42), the mixture is further solidified, and then watered (S44). This watering cures the solidified material in the mixture.

上記工法により、土壌の表層に硬度の高い固化層が形成され、その結果、雑草の種子が土壌の表面に付着・発芽しても、根が固化層を貫通して土壌中に入り込めないため雑草の定着を防止できるのである。   By the above method, a solidified layer with high hardness is formed on the surface layer of the soil. As a result, even if weed seeds adhere to the surface of the soil and germinate, the roots cannot penetrate the solidified layer and enter the soil. Weeding can be prevented.

特開平9−170217号公報JP-A-9-170217

しかしながら、上記した従来の防草工法にあっては、固化層を形成するための土・固化材・水の攪拌及び混合工程(S34)に多大な人的・機械的労力が必要でありコスト高を招来していた。   However, in the above-described conventional herbicidal construction method, a large amount of human and mechanical labor is required for the agitation and mixing step (S34) of the soil, the solidified material, and water for forming the solidified layer, and the cost is high Had been invited.

また、寒冷地において上記防草対策を行った場合、土壌が凍結して隆起するいわゆる凍上現象によって、固化層の崩壊や硬度低下を招いており、十分な防草効果が得られなかった。   Further, when the above herbicidal measures were taken in a cold region, the so-called frost heaving phenomenon that the soil freezes up caused collapse of the solidified layer and reduced hardness, and a sufficient herbicidal effect could not be obtained.

この発明は、従来の上記問題点に鑑みて案出されたものであり、その目的とするところは、簡易な工程で防草対策を行うことができる土壌の防草工法を実現することにある。   The present invention has been devised in view of the above-described conventional problems, and the object thereof is to realize a soil weed prevention method that can take a herbicidal measure in a simple process. .

上記目的を達成するため、本発明に係る請求項1に記載の土壌の防草工法は、
土壌表面に粉状のマグネシアを敷均しする工程と、上記マグネシアの上に表層土を敷均しする工程と、上記表層土の表面に散水を行う工程と、表層土を加圧する工程とを有することを特徴とする。
In order to achieve the above object, the soil herbicidal construction method according to claim 1 according to the present invention,
A step of spreading powdered magnesia on the soil surface, a step of spreading surface soil on the magnesia, a step of watering the surface of the surface soil, and a step of pressurizing the surface soil It is characterized by having.

本発明に係る請求項2に記載の土壌の防草工法は、
土壌表面に粉状のマグネシアを敷均しする第1の工程と、マグネシアの上に中層土を敷均しする第2の工程と、中層土の表面に粉状のマグネシアを敷均しする第3の工程と、マグネシアの上に表層土を敷均しする第4の工程と、表層土の表面に散水を行う第5の工程と、表層土を加圧する第6の工程を有しており、土壌表面に粉状のマグネシアを敷均しする上記第1の工程と、マグネシアの上に表層土を敷均しする上記第4の工程との間において、マグネシアの上に中層土を敷均しする上記第2の工程及び中層土の表面に粉状のマグネシアを敷均しする上記第3の工程を所定回数行うことを特徴とする。
The soil herbicidal construction method according to claim 2 according to the present invention,
A first step of spreading powdered magnesia on the soil surface, a second step of spreading medium soil on the magnesia, and a step of spreading powdered magnesia on the surface of the middle soil 3 steps, a fourth step of spreading the surface soil on the magnesia, a fifth step of spraying the surface of the surface soil, and a sixth step of pressurizing the surface soil. Between the first step of spreading powdered magnesia on the soil surface and the fourth step of spreading surface soil on magnesia, the intermediate layer is spread on magnesia. The second step and the third step of spreading powdered magnesia on the surface of the intermediate soil are performed a predetermined number of times.

本発明の請求項1に記載の土壌の防草工法にあっては、土壌表面に粉状のマグネシアを敷均しする工程と、上記マグネシアの上に表層土を敷均しする工程と、上記表層土の表面に散水を行う工程と、表層土を加圧する工程を行うことにより、土壌の防草構造(土壌と表層土との間に弱アルカリ性のマグネシア層が形成される共に、土壌及び表層土中にマグネシアが混合されて成る土壌の防草構造)を実現することができ、従来のように、雑草の根が入り込めない硬度を有する固化層を形成するための土・固化材・水の攪拌及び混合工程は不要であり、簡易な工程で土壌の防草対策を行うことができる。   In the soil herbicidal construction method according to claim 1 of the present invention, a step of spreading powdered magnesia on the soil surface, a step of spreading surface soil on the magnesia, and the above By performing the step of watering the surface of the surface soil and the step of applying pressure to the surface soil, the soil herbicidal structure (a weakly alkaline magnesia layer is formed between the soil and the surface soil, the soil and the surface layer) Soil, solidification material, and water for forming a solidified layer with a hardness that does not allow weed roots to enter as in the past. Stirring and mixing steps are not required, and soil herbicidal measures can be taken with simple steps.

本発明の請求項2に記載の土壌の防草工法にあっては、土壌表面に粉状のマグネシアを敷均しする第1の工程と、マグネシアの上に表層土を敷均しする第4の工程との間において、マグネシアの上に中層土を敷均しする第2の工程及び中層土の表面に粉状のマグネシアを敷均しする第3の工程を所定回数行うことにより、土壌の防草構造(土壌と表層土との間に、中層土を介して複数のマグネシア層が形成されると共に、上記土壌、表層土及び中層土中にマグネシアが混合されて成る土壌の防草構造)を実現することができ、従来のように、雑草の根が入り込めない硬度を有する固化層を形成するための土・固化材・水の攪拌及び混合工程は不要であり、簡易な工程で土壌の防草対策を行うことができる。   In the soil herbicidal construction method according to claim 2 of the present invention, the first step of spreading powdered magnesia on the soil surface, and the fourth step of spreading the surface soil on the magnesia. In this step, the second step of spreading the middle soil on the magnesia and the third step of spreading the powdered magnesia on the surface of the middle soil are performed a predetermined number of times. Weed prevention structure (soil prevention structure in which a plurality of magnesia layers are formed between the soil and surface soil through intermediate soil, and magnesia is mixed in the soil, surface soil and intermediate soil) As in the past, the agitation and mixing steps of soil, solidification material, and water to form a solidified layer having a hardness that does not allow weed roots to enter are not required. We can take herbicidal measures.

以下、本発明に係る土壌の防草工法及び防草構造を添付図面に基づいて説明する。
図1は、本発明に係る土壌の防草工法の工程を示すフロー図であり、本発明の土壌の防草工法は以下の工程で行われる。
Hereinafter, the soil weed prevention method and the weed control structure according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a flowchart showing the steps of the soil weed prevention method according to the present invention, and the soil weed prevention method of the present invention is performed in the following steps.

先ず、防草対策を施す土壌の除草や表面を平らに均す路盤整正を行う(S10)。
次に、土壌の表面に粉状のマグネシア(酸化マグネシウム)を敷均しする(S12)。この際、十分な防草効果を得るためにマグネシアの使用量は8〜10kg/mと成すのが適当である。尚、マグネシア(酸化マグネシウム)は苦土肥料や食品添加剤としても使用されていることから、生体及び自然環境に対して安全な物質である。
First, weeding the soil to which weeding measures are taken and roadbed leveling is performed to level the surface (S10).
Next, powdery magnesia (magnesium oxide) is spread on the surface of the soil (S12). At this time, in order to obtain a sufficient herbicidal effect, it is appropriate that the amount of magnesia used is 8 to 10 kg / m 2 . In addition, since magnesia (magnesium oxide) is used also as a bitter fertilizer and a food additive, it is a safe substance with respect to a biological body and natural environment.

次に、敷均しされたマグネシアの上に表層土を敷均しする(S14)。この結果、図2に示すように、土壌10と表層土12との間にマグネシア14が配置されることとなる。
上記表層土12としては、真砂土、砕石、山砂等適宜な土を用いることができるが、現地で調達できる地場自然土を用いるのがコスト低減及び現地の自然環境との調和の観点から好ましい。
Next, the surface soil is spread on the spread magnesia (S14). As a result, as shown in FIG. 2, magnesia 14 is disposed between the soil 10 and the surface soil 12.
As the surface soil 12, suitable sand such as sand sand, crushed stone, mountain sand can be used, but it is preferable to use local natural soil that can be procured locally from the viewpoint of cost reduction and harmony with the local natural environment. .

次に、水が地面に浮かない程度に表層土12の表面に散水を行い(S16)、その後、水が十分に引いた段階でプレートやローラー等による転圧を行う(S18)。尚、建物際など機械による転圧ができない場所は踏圧を行う。
上記散水で供給された水及び加圧(転圧・踏圧)によって、表層土12及びマグネシア14が凝縮されると共に土壌毛細管現象により、マグネシア14の一部が上下に配された表層土12及び土壌10中に入り込む。またマグネシア14は水と反応して固化する。
Next, water is sprayed on the surface of the surface soil 12 so that the water does not float on the ground (S16), and then rolling is performed by a plate, a roller or the like when the water is sufficiently drawn (S18). In addition, stepping pressure is applied to places that cannot be rolled by machines, such as near buildings.
Surface soil 12 and magnesia 14 are condensed by the water supplied by the above watering and pressurization (rolling and treading pressure) and part of magnesia 14 is arranged up and down by soil capillary phenomenon. Get in the middle of 10. Magnesia 14 reacts with water and solidifies.

最後に、表層土12表面の不陸調整(地面の凹凸修正)を行う(S20)。この結果、図3に示すように、土壌10と表層土12との間に固化したマグネシア層16が形成されると共に、凝縮及び土壌毛細管現象により土壌10及び表層土12中にマグネシア14が混合されて成る土壌の防草構造が得られる。
尚、マグネシア14が吸い上げられて表層土12中に入り込む土壌毛細管現象を促進するため、S14で敷均しする表層土12の厚さは3cm以内とするのが適当である。
Finally, the surface of the surface soil 12 is adjusted for unevenness (surface irregularity correction) (S20). As a result, as shown in FIG. 3, a solidified magnesia layer 16 is formed between the soil 10 and the surface soil 12, and magnesia 14 is mixed in the soil 10 and the surface soil 12 by condensation and soil capillary phenomenon. The soil weed structure is obtained.
In order to promote the soil capillary phenomenon in which the magnesia 14 is sucked up and enters the surface soil 12, the thickness of the surface soil 12 spread in S14 is suitably within 3 cm.

以下において本発明に係る土壌の防草構造による防草原理を説明する。
植物の成長には15の必須元素(炭素、酸素、水素、窒素、カリウム、カルシウム、マグネシウム、リン、イオウ、ホウ素、モリブデン、亜鉛、鉄、銅、マンガン)が不可欠である。尚、この内、酸素及び水素は水から吸収され、炭素は空気中の二酸化炭素から吸収されるものであり、土壌養分から吸収されるものではない。
Hereinafter, the principle of weed control by the soil weed control structure according to the present invention will be described.
Fifteen essential elements (carbon, oxygen, hydrogen, nitrogen, potassium, calcium, magnesium, phosphorus, sulfur, boron, molybdenum, zinc, iron, copper, manganese) are indispensable for plant growth. Of these, oxygen and hydrogen are absorbed from water and carbon is absorbed from carbon dioxide in the air, not from soil nutrients.

リービッヒの最小律によれば、「植物の成長は、必要とされる栄養素(15の必須元素)のうち、与えられた量のもっとも少ないものにのみ影響される」ものであり、これを換言すれば、「15の必須元素の内、一つでも不足すれば植物の成長が阻害される」ということである。   According to Liebig's minimum law, "plant growth is affected only by the least amount of nutrients required (15 essential elements)", in other words For example, "If any one of the 15 essential elements is insufficient, the growth of the plant is inhibited."

図4は土壌のpHと土壌養分の可給性との関係を示す図である。図4に示す通り、土壌のpHが8以上のアルカリ側になると、鉄及びマンガンの可給性が著しく低下し、植物にこれら元素が十分に供給されない状態となることが判る。   FIG. 4 is a diagram showing the relationship between soil pH and soil nutrient availability. As shown in FIG. 4, it can be seen that when the pH of the soil is on the alkali side of 8 or more, the availability of iron and manganese is significantly reduced, and these elements are not sufficiently supplied to the plant.

本発明で使用するマグネシア14はpHが9〜10の弱アルカリ性であり、本発明に係る土壌の防草構造にあっては、土壌10と表層土12との間にマグネシア層16が形成されると共に、土壌10及び表層土12中にマグネシア14が混合されて成ることから、マグネシア層16の上下に配された土壌10及び表層土12がアルカリ化され、その結果、植物の成長に必須な元素である鉄及びマンガンが雑草に供給されることが抑制されるので、雑草の繁殖を防止することができる。   The magnesia 14 used in the present invention is weakly alkaline having a pH of 9 to 10, and in the soil weed prevention structure according to the present invention, a magnesia layer 16 is formed between the soil 10 and the surface soil 12. At the same time, since magnesia 14 is mixed in the soil 10 and the surface soil 12, the soil 10 and the surface soil 12 arranged above and below the magnesia layer 16 are alkalized, and as a result, an element essential for plant growth. Since it is suppressed that iron and manganese which are these are supplied to weeds, the propagation of weeds can be prevented.

また、本発明の土壌の防草構造は、植物成長の必須元素である鉄及びマンガンの供給抑制により雑草の繁殖を防止するものであり、従来のように、土壌10や表層土12を雑草の根が入り込めない硬度(2N/mm以上)に上げる必要がないことから、土壌が凍結して隆起する凍上現象が発生しても崩壊することがなく、寒冷地においても適用できる。 The soil weed control structure of the present invention prevents weeds from growing by suppressing the supply of iron and manganese, which are essential elements for plant growth. It is not necessary to raise the hardness (2N / mm 2 or more) so that the soil can not enter, so that even if a frost heaving phenomenon occurs in which the soil freezes and rises, it does not collapse and can be applied even in a cold region.

本発明の土壌の防草構造は、上記の通り、防草対策を施す土壌表面へ粉状のマグネシアを敷均しする工程(S12)、マグネシアの上に表層土を敷均しする工程(S14)、表層土2の表面に散水を行う工程(S16)、表層土12を加圧(転圧・踏圧)する工程(S18)を行うことで実現することができ、従来のように、雑草の根が入り込めない硬度(2N/mm以上)を有する固化層を形成するための土・固化材・水の攪拌及び混合工程は不要であり、簡易な工程で土壌の防草対策を行うことができる。 As described above, the soil-proof structure of the soil of the present invention is a step of spreading powdered magnesia on the surface of the soil to be protected against grass (S12), and a step of spreading surface soil on the magnesia (S14). ), Watering the surface of the surface soil 2 (S16), and applying pressure (rolling and treading) the surface soil 12 (S18). stirring and mixing process of the soil and solidifying material, water for forming a solidified layer having a hardness (2N / mm 2 or more) which can not enter is not needed, be performed proof grass measures soil by a simple process it can.

上記においては、土壌10と表層土12との間に一層のマグネシア層16を形成した場合について説明したが、本発明はこれに限定されるものではなく、複数層のマグネシア層16を形成しても良い。   In the above, the case where one magnesia layer 16 is formed between the soil 10 and the surface soil 12 has been described, but the present invention is not limited to this, and a plurality of magnesia layers 16 are formed. Also good.

以下において、土壌10と表層土12との間に二層のマグネシア層16を形成する場合について図5及び図6に基づいて説明する。
この場合、土壌10の表面に粉状のマグネシア14を敷均した(第1の工程)後、マグネシア14の上に中層土18を敷均しする(第2の工程)。次に、中層土18の表面に粉状のマグネシア14を敷均した(第3の工程)後、マグネシア14の上に表層土12を敷均しする(第4の工程)。この結果、土壌10と表層土12との間に、中層土18を介して二層のマグネシア14が配置されることとなる(図5)。
尚、中層土18は、土壌10と表層土12との間に配置される土のことであり、表層土12と同一の土が用いられる。
Hereinafter, a case where two magnesia layers 16 are formed between the soil 10 and the surface soil 12 will be described with reference to FIGS. 5 and 6.
In this case, powdery magnesia 14 is spread on the surface of the soil 10 (first step), and then the intermediate soil 18 is spread on the magnesia 14 (second step). Next, after powdery magnesia 14 is spread on the surface of the middle soil 18 (third step), the surface soil 12 is spread on the magnesia 14 (fourth step). As a result, two layers of magnesia 14 are disposed between the soil 10 and the surface soil 12 via the intermediate soil 18 (FIG. 5).
The middle soil 18 is soil disposed between the soil 10 and the surface soil 12, and the same soil as the surface soil 12 is used.

その後は、上記S16〜S20と同様に、水が地面に浮かない程度に表層土12の表面に散水を行った(第5の工程)後、水が十分に引いた段階で表層土12の表面を加圧し(第6の工程)、最後に表層土12表面の不陸調整を行う。   Thereafter, as in S16 to S20 above, water was sprayed on the surface of the surface soil 12 so that the water did not float on the ground (fifth step), and then the surface of the surface soil 12 was sufficiently drawn. Is applied (sixth step), and finally the surface soil 12 is adjusted for unevenness.

上記散水で供給された水及び加圧(転圧・踏圧)によって、表層土12、マグネシア14及び中層土18が凝縮されると共に土壌毛細管現象により、上層のマグネシア14の一部が上下に配された表層土12及び中層土18中に入り込むと共に、下層のマグネシア14の一部が上下に配された中層土18及び土壌10中に入り込む。さらに、マグネシア14は水と反応して固化する。   The surface soil 12, magnesia 14 and middle soil 18 are condensed by the water supplied by the above watering and pressurization (rolling and treading pressure), and part of the upper magnesia 14 is arranged up and down by the soil capillary phenomenon. In addition to entering the surface soil 12 and the middle soil 18, a part of the lower layer magnesia 14 enters the middle soil 18 and the soil 10 arranged vertically. Further, magnesia 14 reacts with water and solidifies.

この結果、図6に示すように、土壌10と表層土12との間に、中層土18を介して二層のマグネシア層16が形成されると共に、土壌10、中層土12及び表層土12中にマグネシア14が混合されて成る土壌の防草構造が得られる。
このように、土壌10と表層土12との間に、中層土18を介して二層のマグネシア層16を形成した場合には、マグネシア層16が一層の場合に比べて、より深く土をアルカリ化できるので、雑草の繁殖防止効果が向上する。
As a result, as shown in FIG. 6, a two-layer magnesia layer 16 is formed between the soil 10 and the surface soil 12 via the intermediate soil 18, and the soil 10, the intermediate soil 12 and the surface soil 12 A soil weed structure is obtained by mixing magnesia 14 with the above.
As described above, when the two layers of the magnesia layer 16 are formed between the soil 10 and the surface soil 12 via the middle layer soil 18, the soil is more deeply alkaline than the case where the magnesia layer 16 is a single layer. Therefore, the effect of preventing weeds from breeding is improved.

尚、土壌10と表層土12との間に介在させる中層土18の数を増やすことにより、三層以上のマグネシア層16を形成しても良い。
すなわち、土壌10の表面に粉状のマグネシア14を敷均しする第1の工程と、中層土18の表面に敷均されたマグネシア14の上に表層土12を敷均しする第4の工程との間において、マグネシア14の上に中層土12を敷均しする第2の工程と、該中層土12の表面に粉状のマグネシア14を敷均しする第3の工程を所定回数行うことにより、二層以上のマグネシア層16を形成するができ、マグネシア層16が一層の場合に比べて、より深く土をアルカリ化できるので、雑草の繁殖防止効果が向上するのである。この場合も、従来のように、雑草の根が入り込めない硬度(2N/mm以上)を有する固化層を形成するための土・固化材・水の攪拌及び混合工程は不要であり、簡易な工程で土壌の防草対策を行うことができる。
Note that three or more magnesia layers 16 may be formed by increasing the number of intermediate soil layers 18 interposed between the soil 10 and the surface soil layer 12.
That is, a first step of spreading powdered magnesia 14 on the surface of soil 10 and a fourth step of spreading surface soil 12 on magnesia 14 spread on the surface of middle soil 18 The second step of spreading the middle soil 12 on the magnesia 14 and the third step of spreading the powdered magnesia 14 on the surface of the middle soil 12 a predetermined number of times As a result, two or more magnesia layers 16 can be formed, and the soil can be alkalized deeper than in the case where the magnesia layer 16 is a single layer, so that the effect of preventing weed reproduction is improved. Also in this case, the conventional process of stirring and mixing the soil, solidified material, and water for forming a solidified layer having a hardness (2N / mm 2 or more) that does not allow weed roots to enter is not necessary. Soil prevention measures can be taken in the process.

本発明に係る土壌の防草工法の工程を示すフロー図である。It is a flowchart which shows the process of the herbicidal construction method of the soil which concerns on this invention. 土壌にマグネシア及び表層土を敷均した状態を模式的に示す説明図である。It is explanatory drawing which shows typically the state which spread magnesia and surface soil in soil. 土壌と表層土との間にマグネシア層を形成した状態を模式的に示す説明図である。It is explanatory drawing which shows typically the state which formed the magnesia layer between soil and surface soil. 土壌のpHと土壌養分の可給性との関係を示す説明図である。It is explanatory drawing which shows the relationship between the pH of soil and the availability of a soil nutrient. 土壌と表層土との間に二層のマグネシア層を形成する際の工程を模式的に示す説明図である。It is explanatory drawing which shows typically the process at the time of forming a two-layer magnesia layer between soil and surface soil. 土壌と表層土との間に二層のマグネシア層を形成した状態を模式的に示す説明図である。It is explanatory drawing which shows typically the state which formed the two-layer magnesia layer between soil and surface soil. 従来の土壌の防草工法の工程を示すフロー図である。It is a flowchart which shows the process of the conventional soil-proofing method of soil.

10 土壌
12 表層土
14 マグネシア
16 マグネシア層
18 中層土
10 soil
12 Surface soil
14 Magnesia
16 Magnesia Formation
18 Middle soil

Claims (2)

土壌表面に粉状のマグネシアを敷均しする工程と、上記マグネシアの上に表層土を敷均しする工程と、上記表層土の表面に散水を行う工程と、表層土を加圧する工程とを有することを特徴とする土壌の防草工法。   A step of spreading powdered magnesia on the soil surface, a step of spreading surface soil on the magnesia, a step of watering the surface of the surface soil, and a step of pressurizing the surface soil A soil herbicide construction method characterized by having. 土壌表面に粉状のマグネシアを敷均しする第1の工程と、マグネシアの上に中層土を敷均しする第2の工程と、中層土の表面に粉状のマグネシアを敷均しする第3の工程と、マグネシアの上に表層土を敷均しする第4の工程と、表層土の表面に散水を行う第5の工程と、表層土を加圧する第6の工程を有しており、土壌表面に粉状のマグネシアを敷均しする上記第1の工程と、マグネシアの上に表層土を敷均しする上記第4の工程との間において、マグネシアの上に中層土を敷均しする上記第2の工程及び中層土の表面に粉状のマグネシアを敷均しする上記第3の工程を所定回数行うことを特徴とする土壌の防草工法。
A first step of spreading powdered magnesia on the soil surface, a second step of spreading medium soil on the magnesia, and a step of spreading powdered magnesia on the surface of the middle soil 3 steps, a fourth step of spreading the surface soil on the magnesia, a fifth step of spraying the surface of the surface soil, and a sixth step of pressurizing the surface soil. Between the first step of spreading powdered magnesia on the soil surface and the fourth step of spreading surface soil on magnesia, the intermediate layer is spread on magnesia. The soil herbicidal construction method, wherein the second step and the third step of spreading powdered magnesia on the surface of the middle soil are performed a predetermined number of times.
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