JP6574226B2 - Powdered cast fertilizer - Google Patents

Powdered cast fertilizer Download PDF

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JP6574226B2
JP6574226B2 JP2017183703A JP2017183703A JP6574226B2 JP 6574226 B2 JP6574226 B2 JP 6574226B2 JP 2017183703 A JP2017183703 A JP 2017183703A JP 2017183703 A JP2017183703 A JP 2017183703A JP 6574226 B2 JP6574226 B2 JP 6574226B2
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oxamide
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拓也 鴈本
拓也 鴈本
三上 雅史
雅史 三上
靖司 太田
靖司 太田
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エムシー・ファーティコム株式会社
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Description

本発明は、流し込み肥料に関する。   The present invention relates to a poured fertilizer.

流し込み肥料とは、主に稲作栽培での施肥作業の省力化を目的として実施される、水田の水口から灌漑水と一緒に液体肥料や流し込み専用の即溶性肥料、あるいは粒状固形肥料を溶かした肥料溶液を施用する施肥方法に利用される肥料である。流し込み肥料には水に溶解し易い、あるいは水と容易に懸濁できる特徴がある。   Poured fertilizer is mainly used for the purpose of labor-saving in fertilization work in rice cultivation. Fertilizer that dissolves liquid fertilizer, quick-dissolved fertilizer dedicated to pouring, or granular solid fertilizer with irrigation water from the paddy field. It is a fertilizer used for the fertilization method which applies a solution. Poured fertilizer has the characteristic of being easily dissolved in water or easily suspended in water.

粒状固形肥料による流し込み施肥として、特許文献1に肥料粒を多孔質化し即溶性を高める技術が開示されている。また非特許文献1には溶解度が100g/L以上となる泡状肥料の流し込み施肥技術が紹介されている。   As a pouring fertilization with a granular solid fertilizer, Patent Document 1 discloses a technique for making fertilizer grains porous to increase immediate solubility. Non-Patent Document 1 introduces a pouring and fertilizing technique for foamy fertilizer having a solubility of 100 g / L or more.

また、特許文献2に肥料袋の加工によって通常の粒状固形肥料でも流し込み施肥に利用することが可能となる技術が開示されている。   Further, Patent Document 2 discloses a technique that enables ordinary granular solid fertilizer to be used for pouring fertilization by processing a fertilizer bag.

流し込み肥料と同様に、農薬分野において水面上に農薬活性成分を拡散させる技術が多数開示されている。例えば特許文献3に界面活性剤を油状物質で被覆し水面走行性を持った農薬を製剤化する技術、特許文献4に農薬にジアルキルスルホサクシネートを配合して拡散性を向上させた製剤化技術、特許文献5に易溶性のデンプン質担体に農薬活性成分や界面活性剤を含有させる技術、特許文献6にアルカンジオール誘導体を加えることにより農薬活性成分を水面拡散させる技術、特許文献7に界面活性剤アルキルデシンジオールを含有する水面拡散性農薬の製剤化技術が記載されている。   Similar to the cast fertilizer, many techniques for diffusing an agrochemical active ingredient on the water surface in the agrochemical field are disclosed. For example, Patent Document 3 is a technique for formulating an agrochemical with a surface-active agent coated with an oily substance, and Patent Document 4 is a formulation technique for improving diffusibility by blending a pesticide with a dialkylsulfosuccinate. , Patent Document 5 discloses a technique of incorporating an agrochemical active ingredient or a surfactant into an easily soluble starchy carrier, Patent Document 6 discloses a technique for dispersing an agrochemical active ingredient on the surface of water by adding an alkanediol derivative, Patent Document 7 discloses a surface activity. A technique for formulating a water surface diffusible agricultural chemical containing the agent alkyldecindiol is described.

特開2000−143378号公報JP 2000-143378 A 特開2014−143968号公報JP 2014-143968 A 特開平5−155703号公報JP-A-5-155703 特開平6−279204号公報JP-A-6-279204 特開平7−69803号公報JP-A-7-69803 特開2009−114102号公報JP 2009-114102 A 特開2016−14018号公報Japanese Patent Application Laid-Open No. 2006-14018

農業技術体系(農文協発行)土壌施肥編、第7−(1)巻「肥料」p.349−356Agricultural technology system (published by Agricultural Welfare Association) Soil Fertilization, Volume 7- (1) “Fertilizer” p. 349-356

従来の流し込み施肥に用いられる肥料は液状肥料あるいは固形肥料を溶かしたもの、又は特許文献1及び非特許文献1に記載されている即溶性に富んだ肥料に限られ、溶解性が低いか不溶性の肥料は流し込み口付近に沈殿し、均一な肥料成分の拡散が得られない問題があった。これは特許文献2の技術でも同じであり、肥料中の水溶性成分は灌漑水と共に水田中に広がるが、難溶性成分又はこれを含む原料は袋内に残るか水口付近に残留する問題があった。   Fertilizers used in conventional pouring fertilizers are limited to those in which liquid fertilizers or solid fertilizers are dissolved, or fertilizers rich in quick solubility described in Patent Document 1 and Non-Patent Document 1, and are poorly soluble or insoluble. The fertilizer settled near the pouring port, and there was a problem that uniform fertilizer components could not be diffused. This is also the case with the technique of Patent Document 2, in which the water-soluble component in the fertilizer spreads in the paddy field together with the irrigation water, but there is a problem that the hardly soluble component or the raw material containing it remains in the bag or near the water mouth. It was.

農薬分野において多く開示されている界面活性剤を利用した技術は、農薬活性成分及びこれを含有する担体の水面上拡散性を向上させる技術である。しかしこれらの技術は水面拡散性に係る技術であり、農薬の溶解性に影響を及ぼすものではない。また農薬に比べ処理量の多い肥料に対して農薬分野の水面拡散性向上技術を利用すると、水面に拡散した多量の肥料が一部で凝集し均一な拡散が得られなくなってしまう。   A technique using a surfactant that is widely disclosed in the agrochemical field is a technique for improving the diffusibility on the surface of an agrochemical active ingredient and a carrier containing the same. However, these techniques are related to water surface diffusivity and do not affect the solubility of agricultural chemicals. Moreover, if the water surface diffusibility improvement technology in the agricultural chemical field is used for fertilizers with a large amount of treatment compared with agricultural chemicals, a large amount of the fertilizer diffused on the water surface partially aggregates and uniform diffusion cannot be obtained.

本発明者らは、難溶解性の肥料原料であるオキサミド(水溶解度として0.5g/L以下)の流し込み施肥方法を検討した結果、性質の異なる2種類の界面活性剤を組み合わせることによって圃場全体への均一な分散と溶解性の向上効果が得られることを見出し、本発明を完成させるに至った。   As a result of examining the pouring fertilization method of oxamide (0.5 g / L or less as water solubility), which is a hardly soluble fertilizer raw material, the present inventors have combined two types of surfactants having different properties to combine the entire field. The present inventors have found that uniform dispersion and solubility improvement effects can be obtained, and the present invention has been completed.

即ち、本発明の要旨は以下の通りである。
(1)オキサミド、疎水性界面活性剤及び親水性界面活性剤を含む流し込み用の粉末状肥料。
(2)疎水性界面活性剤がステアリン酸マグネシウム又はステアリン酸カルシウムである前記(1)に記載の粉末状肥料。
(3)親水性界面活性剤がジアルキルスルホコハク酸塩である前記(2)に記載の粉末状肥料。
(4)粒子径が1μm〜100μmであるオキサミドを含有する前記(3)に記載の粉末状肥料。
(5)疎水性界面活性剤の含有量が0.2〜4.0重量%である前記(4)に記載の粉末状肥料。
(6)親水性界面活性剤の含有量が0.05〜0.6重量%である前記(5)に記載の粉末状肥料。
That is, the gist of the present invention is as follows.
(1) A powdery fertilizer for pouring containing oxamide, a hydrophobic surfactant and a hydrophilic surfactant.
(2) The powdery fertilizer according to (1), wherein the hydrophobic surfactant is magnesium stearate or calcium stearate.
(3) The powdery fertilizer according to (2) above, wherein the hydrophilic surfactant is a dialkylsulfosuccinate.
(4) The powdery fertilizer according to (3) above, which contains oxamide having a particle diameter of 1 μm to 100 μm.
(5) The powdered fertilizer according to (4), wherein the content of the hydrophobic surfactant is 0.2 to 4.0% by weight.
(6) The powdery fertilizer according to (5), wherein the content of the hydrophilic surfactant is 0.05 to 0.6% by weight.

本発明の粉末状肥料は疎水性と親水性という性質の異なる2種類の界面活性剤を加えているため、粉末状肥料が水に触れると同時にオキサミドに処理した疎水性界面活性剤の効果によって水面を浮遊し拡散する。また水田における10a当たりの農薬処理量が0.4〜2.0kgであるのに対し、肥料は10〜20kgの投入を行うために水面上で粉末状肥料が凝集することがあるが、粉末状肥料に親水性界面活性剤を併用して処理することにより、意外にも一時的に凝集した粉末状肥料も再び水面上を分散させることができる。   Since the powdered fertilizer of the present invention has two kinds of surfactants having different properties of hydrophobicity and hydrophilicity, the surface of the surface is affected by the effect of the hydrophobic surfactant treated with oxamide at the same time that the powdered fertilizer touches water. Float and diffuse. Moreover, while the amount of agricultural chemicals processed per 10a in the paddy field is 0.4 to 2.0 kg, the fertilizer may be agglomerated on the water surface in order to input 10 to 20 kg. By treating the fertilizer with a hydrophilic surfactant in combination, the powdered fertilizer that has unexpectedly temporarily aggregated can be dispersed again on the water surface.

親水性界面活性剤を肥料原料に処理することにより、オキサミドの水溶解度を改善し難溶性肥料原料であるオキサミドを流し込み肥料として利用することが可能になる。   By treating the hydrophilic surfactant with the fertilizer raw material, it is possible to improve the water solubility of the oxamide and use the poorly soluble fertilizer raw material oxamide as a fertilizer.

図1は水面拡散性評価試験を説明するための図である。FIG. 1 is a diagram for explaining a water surface diffusivity evaluation test. 図2は水面拡散性評価試験における実施例1の結果を示す図である。FIG. 2 is a diagram showing the results of Example 1 in the water surface diffusivity evaluation test. 図3は水面拡散性評価試験における比較例1の結果を示す図である。FIG. 3 is a diagram showing the results of Comparative Example 1 in the water surface diffusivity evaluation test. 図4は水面拡散性評価試験における比較例2の結果を示す図である。FIG. 4 is a diagram showing the results of Comparative Example 2 in the water surface diffusivity evaluation test. 図5は水面拡散性評価試験における比較例3の結果を示す図である。FIG. 5 is a diagram showing the results of Comparative Example 3 in the water surface diffusivity evaluation test. 図6は水面拡散性評価試験における比較例4の結果を示す図である。FIG. 6 is a diagram showing the results of Comparative Example 4 in the water surface diffusivity evaluation test. 図7は界面活性剤添加率の影響評価試験を説明するための図である。FIG. 7 is a diagram for explaining an influence evaluation test of a surfactant addition rate.

本発明の粉末状流し込み肥料の調製方法については特に限定されないが、例えば次の方法によって調製できる。   Although it does not specifically limit about the preparation method of the powdery pouring fertilizer of this invention, For example, it can prepare by the following method.

即ち、粒子径1〜100μmのオキサミドに疎水性界面活性剤0.2〜4.0重量%(粉末状肥料全量に対して)、親水性界面活性剤0.05〜0.6重量%(粉末状肥料全量に対して)を添加し、よく混合して製剤化する。混合は公知の方法によって行うことができ、例えば粉体混合機や擂潰機及びV型混合機、糖衣機によって混合してもよい。本発明の粉末状肥料では製造後の容器充填量や容器形状については制限を受けず、目的を達成しうる範囲内で適宜変更して実施できる。   That is, 0.2 to 4.0% by weight of hydrophobic surfactant (based on the total amount of powdered fertilizer), 0.05 to 0.6% by weight of hydrophilic surfactant (powder) Add to the total amount of fertilizer and mix well to formulate. Mixing can be performed by a well-known method, for example, you may mix by a powder mixer, a crusher, a V type mixer, and a sugar coating machine. In the powdered fertilizer of the present invention, the container filling amount and the container shape after production are not limited, and can be carried out by appropriately changing within a range in which the object can be achieved.

前記の方法により製造した本発明の粉末状肥料は、水田へ灌漑水を引き込みながら、水口より流し込むことによって、肥料が水面上に浮上拡散し均一に肥料成分を広げることができる。この流し込みの方法は、水面上より一定速度で粉末状肥料を落とす方法で行えるほか、容器に切れ目を入れて灌漑水にさらす方法でも行うことができる。   The powdered fertilizer of the present invention produced by the above-described method can spread the fertilizer components uniformly by floating and spreading on the water surface by pouring irrigation water into the paddy field and pouring from the water mouth. This pouring method can be performed by dropping powdered fertilizer at a constant rate from the surface of the water, or by cutting the container and exposing it to irrigation water.

製剤化した粉末状肥料が封入容器に付着し施肥作業の効率を低下させることを防止する点から、オキサミドの粒子径は1μm以上であることが好ましく、また、流し込みを行った水口付近に粉末状肥料が沈殿することを防止する点から、オキサミドの粒子径は100μm以下であることが好ましい。   From the viewpoint of preventing the formulated powdered fertilizer from adhering to the enclosed container and reducing the efficiency of the fertilization work, the particle size of the oxamide is preferably 1 μm or more, and the powdered fertilizer is in the vicinity of the poured water inlet. From the viewpoint of preventing the fertilizer from precipitating, the particle size of the oxamide is preferably 100 μm or less.

本発明に使用する親水性界面活性剤は、好ましくはジアルキルスルホコハク酸塩であり、対応するイオン類には、好ましくはナトリウムイオン、カリウムイオン、アンモニウムイオンが挙げられる。更に具体例としては、ジイソブチルスルホコハク酸ナトリウム、ジオクチルスルホコハク酸ナトリウム、ジヘキシルスルホコハク酸ナトリウム、ジアミルスルホコハク酸ナトリウム、ジシクロヘキシルスルホコハク酸ナトリウムなどが挙げられる。   The hydrophilic surfactant used in the present invention is preferably a dialkylsulfosuccinate, and the corresponding ions preferably include sodium ion, potassium ion and ammonium ion. Specific examples include sodium diisobutylsulfosuccinate, sodium dioctylsulfosuccinate, sodium dihexylsulfosuccinate, sodium diamylsulfosuccinate, sodium dicyclohexylsulfosuccinate and the like.

疎水性界面活性剤としては、好ましくはステアリン酸の金属元素からなる塩を利用できる。例えばステアリン酸亜鉛、ステアリン酸カルシウム、ステアリン酸マグネシウム、ステアリン酸バリウム、ステアリン酸アルミニウムが挙げられ、特にステアリン酸カルシウム及びステアリン酸マグネシウムが好ましい。   As the hydrophobic surfactant, a salt made of a metal element of stearic acid can be preferably used. Examples include zinc stearate, calcium stearate, magnesium stearate, barium stearate, and aluminum stearate, with calcium stearate and magnesium stearate being particularly preferred.

添加される界面活性剤が疎水性のみであると、田面上に拡散した粉末状肥料は障害物に付着あるいは粉末状肥料同士で凝集して拡散性を失い、肥料を均一に拡散させることができない。疎水性界面活性剤の添加量は、水面拡散性が保持し、沈殿及び堆積を防止する点から、好ましくは0.2〜4.0重量%であり、更に好ましくは1.0〜3.0重量%である。   If the added surfactant is only hydrophobic, the powdered fertilizer diffused on the paddy surface adheres to the obstacles or aggregates with the powdered fertilizer and loses diffusibility, and the fertilizer cannot be uniformly diffused. . The addition amount of the hydrophobic surfactant is preferably 0.2 to 4.0% by weight, more preferably 1.0 to 3.0% from the viewpoint of maintaining water surface diffusibility and preventing precipitation and deposition. % By weight.

界面活性剤が親水性のみで構成された場合、粉末状肥料は十分な浮上拡散性を得られずに肥料を流し込んだ水口付近に沈殿し堆積する。親水性界面活性剤の添加量は、田面上に拡散した粉末状肥料が障害物に付着あるいは粉末状肥料同士で凝集するのを防止し、肥料を均一に拡散させる点から、好ましくは0.05〜0.6重量%である。   When the surfactant is composed only of hydrophilicity, the powdered fertilizer does not obtain sufficient floating diffusivity and precipitates and accumulates near the water inlet into which the fertilizer is poured. The amount of the hydrophilic surfactant added is preferably 0.05, from the viewpoint of preventing the powdered fertilizer diffused on the paddy surface from adhering to the obstacles or agglomerating between the powdered fertilizers and uniformly dispersing the fertilizer. ~ 0.6% by weight.

前記の添加量以上に界面活性剤を加えても拡散性を得ることはできるが、界面活性剤添加量の増量は粉末状肥料に含まれる肥料成分の低下に繋がるために一枚の水田に何袋もの肥料を施肥する必要が生じ、流し込み施肥の利点である省力性が低下する。   Although diffusibility can be obtained even if a surfactant is added in excess of the above-mentioned added amount, an increase in the added amount of the surfactant leads to a decrease in fertilizer components contained in the powdered fertilizer. It becomes necessary to fertilize a bag of fertilizer, which reduces the labor saving that is an advantage of pouring fertilization.

また、疎水性と親水性の異なる性質を持つ界面活性剤の組み合わせ効果の点から、疎水性界面活性剤と親水性界面活性剤との混合比は、好ましくは8:1〜0.8:1、更に好ましくは7:1〜0.9:1である。   From the viewpoint of the combined effect of surfactants having different properties of hydrophobicity and hydrophilicity, the mixing ratio of the hydrophobic surfactant to the hydrophilic surfactant is preferably 8: 1 to 0.8: 1. More preferably, it is 7: 1 to 0.9: 1.

次に、実施例で本発明を更に具体的に説明するが、本発明はこれらに限定されるものではない。以下で部とあるのは、全て重量部を示す。   EXAMPLES Next, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. In the following, “parts” means all parts by weight.

実施例1 界面活性剤3.5重量%(内 親水性0.5重量%、疎水性3.0重量%)添加
オキサミド(粒子径10.25μm)96.5部にジアルキルスルホコハク酸塩(ジオクチルスルホコハク酸ナトリウム)0.5部及びステアリン酸マグネシウム3.0部を加えて擂潰機で粉砕混合を行い、混合物100.0部を得た。
Example 1 Addition of 3.5% by weight of surfactant (including 0.5% by weight of hydrophilicity and 3.0% by weight of hydrophobicity) Dialkylsulfosuccinate (dioctylsulfosuccinate) was added to 96.5 parts of oxamide (particle size: 10.25 μm). (Sodium acid) 0.5 parts and magnesium stearate 3.0 parts were added and pulverized and mixed with a grinder to obtain 100.0 parts of a mixture.

実施例2 界面活性剤0.5重量%(内 親水性0.1重量%、疎水性0.4重量%)添加
オキサミド(粒子径10.25μm)99.5部にジアルキルスルホコハク酸塩(ジオクチルスルホコハク酸ナトリウム)0.1部及びステアリン酸マグネシウム0.4部を加えて擂潰機で粉砕混合を行い、混合物100.0部を得た。
Example 2 0.5% by weight of surfactant (inside 0.1% by weight of hydrophilic, 0.4% by weight of hydrophobic) added 99.5 parts of oxamide (particle size: 10.25 μm) to dialkyl sulfosuccinate (dioctyl sulfosuccinate) 0.1 parts of sodium acidate) and 0.4 parts of magnesium stearate were added and pulverized and mixed with a grinder to obtain 100.0 parts of a mixture.

実施例3 界面活性剤1.0重量%(内 親水性0.5重量%、疎水性0.5重量%)添加
オキサミド(粒子径10.25μm)99.0部にジアルキルスルホコハク酸塩(ジオクチルスルホコハク酸ナトリウム)0.5部及びステアリン酸マグネシウム0.5部を加えて擂潰機で粉砕混合を行い、混合物100.0部を得た。
Example 3 Addition of 1.0% by weight of surfactant (including 0.5% by weight of hydrophilic and 0.5% by weight of hydrophobic) Oxamide (particle size: 10.25 μm) 99.0 parts of dialkylsulfosuccinate (dioctylsulfosuccinate) 0.5 parts of sodium acidate) and 0.5 parts of magnesium stearate were added and pulverized and mixed with a grinder to obtain 100.0 parts of a mixture.

実施例4 界面活性剤0.5重量%(内 親水性0.13重量%、疎水性0.37重量%)添加
オキサミド(粒子径10.25μm)99.5部にジアルキルスルホコハク酸塩(ジオクチルスルホコハク酸ナトリウム)0.13部及びステアリン酸マグネシウム0.37部を加えて擂潰機で粉砕混合を行い、混合物100.0部を得た。
Example 4 0.5% by weight of surfactant (inside 0.13% by weight hydrophilic, 0.37% by weight hydrophobic) added 99.5 parts of oxamide (particle size: 10.25 μm) to dialkylsulfosuccinate (dioctylsulfosuccinate) 0.13 part of sodium acidate) and 0.37 part of magnesium stearate were added and pulverized and mixed with a grinder to obtain 100.0 parts of a mixture.

比較例1 界面活性剤無添加
オキサミド(粒子径10.25μm)100.0部を擂潰機で粉砕混合を行った。
Comparative Example 1 No surfactant added Oxamide (particle size: 10.25 μm) 100.0 parts was pulverized and mixed with a crusher.

比較例2 界面活性剤3.5重量%(内 親水性3.5重量%)添加
オキサミド(粒子径10.25μm)96.5部にジアルキルスルホコハク酸塩(ジオクチルスルホコハク酸ナトリウム)3.5部を加えて擂潰機で粉砕混合を行い、混合物100.0部を得た。
Comparative Example 2 Addition of 3.5% by weight of surfactant (including 3.5% by weight of hydrophilic property) 3.5 parts of dialkylsulfosuccinate (sodium dioctylsulfosuccinate) was added to 96.5 parts of oxamide (particle size: 10.25 μm). In addition, the mixture was pulverized and mixed with a crusher to obtain 100.0 parts of a mixture.

比較例3 界面活性剤3.5重量%(内 疎水性3.5重量%)添加
オキサミド(粒子径10.25μm)96.5部にステアリン酸マグネシウム3.5部を加えて擂潰機で粉砕混合を行い、混合物100.0部を得た。
Comparative Example 3 Addition of 3.5% by weight of surfactant (within 3.5% by weight of hydrophobicity) Add 3.5 parts of magnesium stearate to 96.5 parts of oxamide (particle size: 10.25 μm) and grind with a grinder. Mixing was performed to obtain 100.0 parts of a mixture.

比較例4 界面活性剤3.5重量%(内 親水性0.25重量%、疎水性3.25重量%)添加
オキサミド(粒子径10.25μm)96.5部にジアルキルスルホコハク酸塩(ジオクチルスルホコハク酸ナトリウム)0.25部及びステアリン酸マグネシウム3.25部を加えて擂潰機で粉砕混合を行い、混合物100.0部を得た。
Comparative Example 4 Surfactant 3.5% by weight (including hydrophilic 0.25% by weight, hydrophobic 3.25% by weight) added Oxamide (particle size 10.25 μm) 96.5 parts with dialkyl sulfosuccinate (dioctyl sulfosuccinate) 0.25 parts of sodium acid) and 3.25 parts of magnesium stearate were added and pulverized and mixed with a grinder to obtain 100.0 parts of a mixture.

試験例1 水面拡散性評価試験
図1に示されるように、縦23cm、横33cmの樹脂製各トレイに水深約4cmになるよう約3Lの水を入れ、実施例1及び比較例1〜4によって調製した肥料約150mgを投下した。約30分後、図1に示された通りの小区分毎に水面を覆う肥料の面積を目視で測定し、その被覆面積を水面被覆度として点数を付けた。その結果を図2〜6に示す。
Test Example 1 Water Surface Diffusivity Evaluation Test As shown in FIG. 1, about 3 L of water was placed in each resin tray having a length of 23 cm and a width of 33 cm so that the water depth was about 4 cm, and according to Example 1 and Comparative Examples 1 to 4 About 150 mg of the prepared fertilizer was dropped. After about 30 minutes, the area of the fertilizer covering the water surface was visually measured for each small section as shown in FIG. 1, and the coverage area was scored as the water surface coverage. The results are shown in FIGS.

水面被覆度は小区分毎に与え、小区分中に肥料が無いあるいは見えない場合に0.0、被覆面積が5%未満であった場合に0.2、5〜25%の時に1.0、25〜50%の時に2.0、50〜75%の時に3.0、75%を超えた時に4.0を付けた(表1)。   The water surface coverage is given for each small section, 0.0 when no fertilizer is visible or visible in the small section, and 1.0 when the coated area is less than 5%, 0.2, 5-25%. It was 2.0 when it was 25-50%, 3.0 when it was 50-75%, and 4.0 when it exceeded 75% (Table 1).

Figure 0006574226
Figure 0006574226

実施例1は投入した粉末状肥料が水面を覆うように薄く全面に広がり、肥料の沈殿は見られなかった。   In Example 1, the charged powdered fertilizer spread thinly over the entire surface so as to cover the water surface, and no fertilizer precipitation was observed.

比較例1は投入した粉末状肥料がそのまま沈み、水面での拡散は殆ど見られない。比較例2も肥料投入位置での沈み込み量が多く、少量が肥料投入位置付近に漂っている程度であった。   In Comparative Example 1, the charged powdery fertilizer sinks as it is, and almost no diffusion on the water surface is observed. In Comparative Example 2, the amount of subsidence at the fertilizer input position was large, and a small amount drifted in the vicinity of the fertilizer input position.

比較例3及び比較例4は共に粉末状肥料投入直後から全体に拡散したが、各区で拡散した粉末が凝集して沈殿し、被覆面積が減少した。   In Comparative Examples 3 and 4, both diffused immediately after the addition of the powdered fertilizer, but the powder diffused in each section aggregated and precipitated, and the coating area decreased.

試験例2 界面活性剤添加率の影響評価試験
図7に示されるように、縦5m、横15mのプールに水深5cmになるよう約3750Lの水を張り、図7に示した水口(入水箇所)の位置から実施例1〜4及び比較例1の製剤を投下した。プールの水深が10cmになるまで流速毎分41.7Lで水を流し込んだ。水深が目標値に達した時点及び製剤投入から24時間後に各地点から水を採取しオキサミド溶解量を測定した。
オキサミド溶解量をppmとして表2に示した。
Test Example 2 Surfactant Addition Effect Evaluation Test As shown in FIG. 7, about 3750 L of water was placed in a 5 m long and 15 m wide pool so that the water depth was 5 cm. The preparations of Examples 1 to 4 and Comparative Example 1 were dropped from this position. Water was poured at a flow rate of 41.7 L / min until the water depth in the pool reached 10 cm. Water was collected from each point when the water depth reached the target value and 24 hours after the preparation was added, and the amount of oxamide dissolved was measured.
The amount of oxamide dissolved is shown in Table 2 as ppm.

Figure 0006574226
Figure 0006574226

界面活性剤添加量が1.0重量%以上である実施例1及び実施例3では入水直後の溶解濃度が全体で10ppm程度あり、24時間後には30ppm以上となった。界面活性剤添加量が0.5重量%である実施例2及び実施例4においても、入水直後の溶解濃度は10ppm以下であるが、24時間後には20ppm以上となった。また、これら実施例の溶解濃度はプール全体で偏りが無く拡散していることが確認できた。   In Example 1 and Example 3 in which the surfactant addition amount was 1.0% by weight or more, the total dissolved concentration immediately after entering water was about 10 ppm, and after 24 hours, it became 30 ppm or more. Also in Example 2 and Example 4 in which the surfactant addition amount was 0.5% by weight, the dissolved concentration immediately after entering water was 10 ppm or less, but after 24 hours it became 20 ppm or more. Moreover, it has confirmed that the melt | dissolution density | concentration of these Examples has spread | diffused without the bias | inclination in the whole pool.

一方で比較例1は24時間後の溶解濃度でも10ppm程度でオキサミドが溶解していないことが示されており、また測定位置による濃度差も大きい。   On the other hand, Comparative Example 1 shows that the oxamide is not dissolved at about 10 ppm even at a dissolved concentration after 24 hours, and the concentration difference depending on the measurement position is large.

Claims (4)

オキサミド、疎水性界面活性剤及び親水性界面活性剤を含む流し込み用の粉末状肥料であって、
疎水性界面活性剤がステアリン酸マグネシウム、ステアリン酸カルシウム、ステアリン酸亜鉛、ステアリン酸バリウム及びステアリン酸アルミニウムから選ばれ、
親水性界面活性剤がジアルキルスルホコハク酸塩であり、
粒子径が1μm〜100μmであるオキサミドを含有し、
疎水性界面活性剤の含有量が0.2〜4.0重量%であり、
親水性界面活性剤の含有量が0.05〜0.6重量%であり、
疎水性界面活性剤と親水性界面活性剤との混合比が8:1〜0.8:1である、
流し込み用の粉末状肥料
A powdered fertilizer for pouring comprising oxamide, a hydrophobic surfactant and a hydrophilic surfactant ,
The hydrophobic surfactant is selected from magnesium stearate, calcium stearate, zinc stearate, barium stearate and aluminum stearate;
The hydrophilic surfactant is a dialkylsulfosuccinate;
Containing oxamide having a particle size of 1 μm to 100 μm,
The content of the hydrophobic surfactant is 0.2 to 4.0% by weight,
The content of the hydrophilic surfactant is 0.05 to 0.6% by weight,
The mixing ratio of hydrophobic surfactant to hydrophilic surfactant is 8: 1 to 0.8: 1,
Powdered fertilizer for pouring .
疎水性界面活性剤がステアリン酸マグネシウム又はステアリン酸カルシウムである請求項1記載の粉末状肥料。   The powdered fertilizer according to claim 1, wherein the hydrophobic surfactant is magnesium stearate or calcium stearate. 農薬を含有しない請求項1又は2記載の粉末状肥料。The powdered fertilizer according to claim 1 or 2, which does not contain an agricultural chemical. 水田へ灌漑水を引き込みながら、請求項1〜3のいずれか1項に記載の粉末状肥料を水口より流し込むことを含む施肥方法。A fertilizing method comprising pouring the powdered fertilizer according to any one of claims 1 to 3 through a water mouth while drawing irrigation water into a paddy field.
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