AGROCHEMICAL COMPOSITION AND METHODS OF PREPARATION AND USE THEREOF

Abstract

The present invention relates to an agrochemical composition comprising, as a herbicidal substance, a combination of a phenylhydrazine derivative and a triketone, a defined solvent, and a surfactant system comprising a non-ionic and an ionic surfactant. The invention also relates to a process for preparing said agrochemical composition, to an agrochemical emulsion or suspension obtainable by diluting said agrochemical composition, and to a method for controlling unwanted vegetation using said agrochemical composition.

Description

AGROCHEMICAL COMPOSITION AND METHODS OF PREPARATION AND USE THEREOF TECHNICAL FIELD The present invention relates to an agrochemical composition comprising, as a herbicidal substance, a combination of a phenylhydrazine derivative and a triketone, a particular solvent, and a surfactant system comprising a non-ionic and an ionic surfactant. The invention also relates to a process for preparing said agrochemical composition, to an agrochemical emulsion or suspension obtainable by diluting said agrochemical composition, and to a method of controlling unwanted vegetation using said agrochemical composition. BACKGROUND Herbicides are widely used in crop protection. Most are used as single active ingredients in agrochemical formulations, but some have been found to increase their activity when used in combination. For practical reasons, it is desirable for the end user to have a single formulation to apply to their crop. However, combining different active ingredients in the same agrochemical formulation can be challenging, particularly when the herbicides to be combined have different physical and chemical characteristics. The choice of the L L7 ίΠΠ / ίΖηΖ / E / YΥΙ Adjuvants, solvents and surfactants that allow combining the active principles of different families in a single stable agrochemical composition may be the subject of a long and extensive investigation. Therefore, the objective of the present invention was to propose a stable composition that combines the following two families of herbicidal active ingredients: phenylpyridazine derivatives and triketones. It has been discovered that these two families of active ingredients increase their activity against unwanted vegetation when used together, but also that it was difficult to formulate them into a single stable formulation without observing problems of physical stability and / or chemical degradation of the active ingredients. BRIEF DESCRIPTION OF THE INVENTION The objective of the present invention has been achieved by providing an agrochemical composition comprising: as a herbicidal substance: a combination of a phenylhydrazine derivative and a triketone; a solvent selected from the group consisting of dioxolanes, N,Ndialkylamides, diesters, esteramides and mixtures thereof; and a surfactant system comprising a non-ionic surfactant and an anionic surfactant. The present invention also provides a procedure L L7 Lnn / LZnZ / E / Yli for the preparation of said agrochemical composition, wherein the phenylhydrazine derivative, the tricetone, the surfactant system described above and the solvent are mixed together. A third aspect of the present invention is to propose an agrochemical emulsion or suspoemulsion obtainable by diluting the agrochemical composition defined above, preferably with a dilution ratio ranging from 0.1:99.9 to 5.0:95.0, preferably from 0.2:99.8 to 3.0:97.0 and more preferably from 0.3:99.7 to 1.0:99.0. Finally, it is also an object of the invention to propose a method of controlling unwanted vegetation, comprising applying an effective amount of said agrochemical composition or of said agrochemical emulsion or suspoemulsion to plants (crop or unwanted), seeds or to the soil. DETAILED DESCRIPTION OF THE INVENTION Definitions The term agrochemical composition refers to a chemical formulation intended for use in agriculture. In most cases, agrochemicals refer to pesticides, including insecticides, herbicides, fungicides, and nematicides. It can also include synthetic fertilizers, hormones and other chemical growth agents, and concentrated stocks of unprocessed animal manure. Herbicidal substance or herbicides, also known Commonly known as weed suppressants, herbicides are chemical substances used to control unwanted plants. Selective herbicides control specific weed species while leaving the desired crop relatively unharmed, whereas non-selective herbicides (sometimes called total weed suppressants in commercial products) can be used to clear wastelands, industrial and construction sites, railways, and railway embankments because they destroy all plant material they come into contact with. As used herein, the terminology "a combination of a phenylhydrazine derivative and a triketone" means that both herbicide families are present. It should also be understood that one or more herbicides from each family may be present. A solvent is understood in a broad sense, encompassing in particular the functions of co-solvent, crystallization inhibitor, and separating agent. The term solvent can specifically indicate a product that is liquid at the temperature of use, preferably having a melting point less than or equal to 20 degrees Celsius, preferably 5 degrees Celsius, or preferably 0 degrees Celsius, which can contribute to making a solid substance become liquid, or to preventing or retarding the L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ solidification or crystallization of the material in a liquid medium. As used herein, the terminology of a surfactant system within the meaning of the present invention is a compound that reduces the surface tension (or interfacial tension) between two liquids, between a gas and a liquid, or between a liquid and a solid. An emulsion is understood as a mixture of two or more liquids that are normally immiscible (not mixable or combinable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Although the terms colloid and emulsion are sometimes used interchangeably, emulsion should be used when both phases, dispersed and continuous, are liquids. Suspoemulsion, in the meaning of the present invention, is an emulsion that also contains particles (for example, of herbicidal active ingredient) in suspension. As used herein, the terminology "control" within the meaning of the present invention means to reduce, prevent, limit, or eliminate unwanted vegetation. Unwanted vegetation or unwanted vegetation refers to all plants, such as broadleaf weeds, weed lawns or Cyperaceae, that grow in sites where they are not wanted. As used herein, the terminology quantity L L7 ίΠΠ / ίΖηΖ / E / YΥΙ effective or herbicidally effective amount with reference to the relative amount of herbicide in a herbicide composition means the relative amount that is effective in controlling the growth of a target plant when the herbicide composition is applied by spraying to the target plant and / or the plant environment at a given application rate. The term "a / an" is a generic plural, meaning that it covers at least one, but also possibly several, compounds it designates. For the sake of brevity, this term has been used in the specification and the claims, but it may be replaced by "at least one" or "one or more" throughout the text of this invention without any change in meaning, unless explicitly mentioned in the description. Herbicide substance As mentioned above, the agrochemical composition according to the invention comprises, as a herbicidal substance, a combination of a phenylhydrazine derivative and a triketone. Phenylhydrazine derivatives Phenylhydrazine derivatives are selective herbicides used to control unwanted vegetation and are classified as C3 herbicides by the Herbicide Resistance Action Committee (HRAC). They belong to the class of photosystem II inhibitors, meaning their mechanism of action is based on inhibiting photosynthesis at the photosystem II level. L L7 iЯРР / ίЖηЖ / E / YI of photosystem II in plants. In particular, this class of herbicide inhibits the binding of quinone to the DI protein of photosystem II, causing electrons to accumulate in chlorophyll molecules and resulting in excessive oxidation, which leads to plant death. Phenylhydrazine derivatives include pyridate, pyridafol, and pyrazone. According to the invention, the phenylhydrazine derivative is advantageously selected from the group consisting of pyridate, pyridafol, pyrazone and mixtures thereof, preferably pyridate. Pyridate and pyridafol have the phenyl substituent attached to the C atom in the pyridazine heterocycle, while pyrazone has the phenyl substituent attached to the N atom in the pyridazine heterocycle. The developed structures are as follows: L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ Pyrazone Pyridate Pyridafol Pyridate (IUPAC name (6-chloro-3-phenylpyridazin-4-yl)octylsulfanyl formate) can be obtained from the chlorination of 3-phenylpyridazone-6 and subsequent saponification to produce phenyl-4-hydroxy-6-chloropyridazine, which is further reacted to produce pyridate. It is a commercial herbicide. Triketones Triketones are selective herbicides used to control unwanted vegetation and are classified as F2 by the Herbicide Resistance Action Committee (HRAC). Their mechanism of action is based on the inhibition of pigment synthesis (also known as bleaching herbicides). Triketone herbicides include mesotrione, tembotrione, sulcotrione, and tefuryltrione. In the agrochemical composition according to the invention, the tricetone is advantageously selected from the group consisting of mesotrione, tembotrione, sulcotrione, tefuryltrione and mixtures thereof, preferably mesotrione. Mesotrione (IUPAC name 2-(4-methylsulfonyl-2-nitrobenzoyl)-cyclohexane-1,3-dione), tembotrione (IUPAC name 2-[2-chloro-4-methylsulfonyl-3-(2,2,2-trifluoroethoxymethyl)benzoyl]cyclohexane-1,3-trione), sulcotrione (IUPAC name 2-[2-chloro-4-(methylsulfonyl)benzoyl]-1,3-cyclohexanedione) and tefuryltrione (IUPAC name 2-[2-chloro-4-methylsulfonyl-3-(oxolan-2-ylmethoxymethyl)benzoyl]cyclohexane-1,3-dione) are all commercial herbicides. Ratio between herbicide active ingredients The weight ratio of phenylhydrazine derivative:triketone in the agrochemical composition according to the invention may vary L L7 Lnn / LZnZ / E / Yli from 0.1:1 to 1000:1, preferably from 0.1:1 to 50:1 and more preferably from 0.1:1 to 35:1. When the tricetone is mesotrione, the range may be more preferably from 1:1 to 10:1. Solvent As mentioned above, the agrochemical composition according to the invention also comprises a solvent selected from the group consisting of dioxolanes, N,N-dialkylamides, diesters, esteramides, and mixtures thereof. Dioxolan In a first and preferred embodiment, the solvent is a dioxolane or a mixture of dioxolanes. According to this first realization, dioxolane is advantageously of formula I: L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ (I) where Ri and R2, independently of each other, are selected from the group consisting of: a linear or branched C1-C12 alkyl, a C4-C12 cycloalkyl, or an aryl. R3 is H, an alkyl, a cycloalkyl or a linear or branched -C(=O)R4 group, where R4 is a linear or branched C1-C4 alkyl or C5-C6 cycloalkyl. In a preferred embodiment, Ri and R2, independently of each other, are selected from the group consisting of: methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl, tere-butyl, n-pentyl, cyclopentyl, cyclohexyl or phenyl. Advantageously, in formula I above, R3 is either H or a C(=O)R4 group, where R4 is methyl, ethyl, isopropyl, n-propyl, isobutyl, n-butyl, or tere-butyl. More preferably, R3 is H. A preferred embodiment is where Ri and R2 are methyl and R3 is H. In this case, the compound is commercially available, for example, under the name Rhodiasolv® Li-Tec 2V. This compound can be synthesized by the reaction between glycerol and acetone under well-known classical conditions. In another embodiment, Ri is methyl, R2 is isobutyl, and R3 is H. In this case, the compound is also commercially available. This compound can be synthesized by the reaction between glycerol and isobutyl methyl ketone under well-known classical conditions. In a third embodiment, Ri is methyl, R2 is phenyl, and R3 is H. In this case, the compound is commercially available. This compound can be synthesized by the reaction between glycerol and acetophenone under very classical conditions. L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ known. Another possibility is that Ri and R2 are methyl groups and R3 is a -C(=O)R4 group, where R4 is methyl. In this case, the compound is commercially available. This compound can be synthesized by the transesterification of Solketal with an alkyl acetate under well-known classical conditions. Glycerol can be obtained as a co-product of biodiesel production during the transesterification of triglycerides. Esteramida In a second embodiment, the solvent is an esteramide. According to this second realization, esteramide can be of formula II: R5OOC-A-CONR6R7(II) where: R5 is a radical selected from radicals based on saturated or unsaturated, linear or branched, optionally cyclic, optionally aromatic hydrocarbons having an average number of carbon atoms ranging from 1 to 36; Re and R7, which may be identical or different, are each radicals selected from radicals based on saturated or unsaturated, linear or branched hydrocarbons, optionally cyclic, optionally aromatic, optionally substituted having an average number of carbon atoms ranging from 1 to 36, with the condition that Rg and R? can form L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ together optionally a ring member that is optionally substituted and / or that optionally contains a heteroatom; and A is a linear or branched divalent alkyl radical that has an average number of carbon atoms ranging from 2 to 12. The Re, Re, and R? groups, which may be identical or different, can be specially selected from alkyl, aryl, alkaryl, or C1-C12 arylalkyl groups, or the phenyl group. The Re and R? groups may optionally be substituted, particularly with hydroxyl groups. The R5 group can be specially selected from methyl, ethyl, propyl, isopropyl, n-butyl, isobutyl, n-pentyl, isopentyl, isoamyl, n-hexyl, cyclohexyl, 2-ethylbutyl, noctyl, isooctyl, 2-ethylhexyl, tridecyl groups. The Re and R7 groups, which may be identical or different, can be selected specifically from methyl, ethyl, propyl (n-propyl), isopropyl, n-butyl, isobutyl, n-pentyl, amyl, isoamyl, hexyl, cyclohexyl, or hydroxyethyl groups. The Re and R7 groups may also be such that, together with the nitrogen atom, they form a morpholine, piperazine, or piperidine group. In particular embodiments, Re=R7=methyl, or Re=R7=ethyl, or Re=R7=hydroxyethyl. According to a particular embodiment, if A comprises a linear group of formula -CH2-CH2- and / or of formula -CH2-CH2-CH2-CH2- and / or L L7 ίΠΠ / ίΖηΖ / E / YΥΙ of formula —(CH2) e—then is a mixture of A groups. According to a particular embodiment, if A is linear, then it is a mixture of A groups, for example a mixture of two or three groups -CH2-CH2- (ethylene) ; -CH2-CH2-CH2- (n-propylene) ; and -CH2-CH2CH2-CH2- (n-butylene) . According to a first particular embodiment of the invention, group A is a divalent linear alkyl group chosen from the groups of the following formulas: -CH2-CH2- (ethylene); -CH2CH2-CH2- (n-propylene); -CH2-CH2-CH2-CH2- (n-butylene), and mixtures thereof. According to a particular variant in this first embodiment, the compound of the invention is selected from the following compounds: MeOOC-CH2-CH2-CONMe2; MeOOC-CH2-CH2-CH2-CONMe2; MeOOC-CH2-CH2-CH2-CONMe2, as a mixture with MeOOC-CH2-CH2-CH2CH2-CONMe2 and / or with MeOOC-CH2-CH2-CONMe2. According to a second particular embodiment of the invention, group A is a divalent branched alkylene group having one of the following formulas (lia), (Ilb), (lie), (Illa) and (Illb), or a mixture of at least two groups chosen from the groups of formulas (lia), (Ilb) and (lie) or from the groups of formulas (Illa) and (Illb), or a mixture of at least two groups, one chosen from the groups of formulas (lia), (Ilb) and (lie) and the others chosen from the groups of formulas (Illa) and (Illb): L L7 Lnn / LZnZ / E / Yli - (CHRg)y- (CHRg)x- (CHRg)Z-CH2-CH2- (Ha) - CH2-CH2- (CHRg)z- (CHRg)x- (CHRg)y- (Ilb) - (CHRg)Z-CH2- (CHRg)x-CH2- (CHRg)y- (lie) - (CHRg)y- (CHRg)x- (CHRg)z-CH2- (Illa) - CH2- (CHRg)z- (CHRg) x- (CHRg)y- (Illb) where: • x is an integer greater than 0; • and is an average integer greater than or equal to 0; • z is an average integer greater than or equal to 0; • Rg, which is identical or different, is a Ci-Ce alkyl group, preferably C1-C4; and • Rg, which is identical or different, is a hydrogen atom or a Ci-Cs alkyl group, preferably C1-C4. In this second particular realization, group A is preferably a group such that y=z=0. Preferably, in formula (lia) and / or in formula (Ilb): x=l; y=z=0; Rg=methyl. Preferably, in formula (Illa) and / or in formula (Illb): x=l; y=z=0; Rg=ethyl. According to a particular variant in the second particular embodiment, the compound of the invention is selected from the following compounds, and mixtures thereof: MeOOC-AMG-CONMe2; L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ MeOOC-AES-CONMe2; PeOOC-AMG-CONMe2; PeOOC-AES-CONMe2; CicloOOC-AMG-CONMe2; CicloOOC-AES-CONMe2; EhOOC-AMG-CONMe2; EhOOC-AES-CONMe2; PeOOC-AMG-CONEt2; PeOOC-AEg-CONEt2; CycleOOC-AMG-CONEt2; ClcloOOC-AES-CONEt2; BuOOC-AMG-CONEt2; BuOOC-AEs-CONEt2; BuOOC-AMG-CONMe2; BuOOC-AES-CONMe2; EtBuOOC-AMG-CONMe2; EtBuOOC-AES-CONMe2; n-HeOOC-AMG-CONMe2; n-HeOOC-AEs-CONMe2; where AMg represents an MGa group of the formula -OH (CH2) -CH2-CH2-, or the MGb group of the formula -CH2-CH2-CH (CH3) - or a mixture of the MGa and MGb groups; AEs represents a group ESa of the formula -CH (C2Hs)-CH2-, or group ESb of the formula -CH2-CH (C2Hs) - or a mixture of the groups ESa and ESb; For example, it represents a pentyl group, preferably an isopentyl or isoamyl group; L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ cycle represents a cyclohexilo group; It represents a 2-ethylhexylo group; Bu represents a butyl group, preferably a n-butyl or tere-butyl group; EtBu represents an ethylbutyl group; and n-He represents an n-hexyl group. In the preferred embodiment, the esteramide comprises a mixture of MeOOC-AMG-CONMe2 and MeOOC-AEs-CONMe2, which is commercially available under the trade name Rhodiasolv® Polarclean. N,N-dyalkylamidas In a third embodiment, the solvent is an N,N-dialkylamide of a carboxylic acid, preferably an N,N-dimethylamide of a C2-C20 carboxylic acid. According to this third embodiment, the N,N-dialkylamide is specifically an alkyldimethylamide (ADMA) where the alkyl group is, for example, Cg-Cys, more particularly N,N-dimethyldecanamide and N,N-dimethyloctanamide, or mixtures with different sizes of alkyl groups. Special mention is made of the compounds marketed by Solvay under the trade names Rhodiasolv® ADMA810 and Rhodiasolv® ADMA10. Diesters In a fourth embodiment, the solvent is a diester of a carboxylic acid. L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ According to this fourth embodiment, the diester solvents of the compositions according to the invention correspond to the formula RaOOC-A-COORa where Ra represents a linear or branched alkyl group comprising 1 to 6 carbon atoms, and preferably represents a methyl group, and A represents a linear or branched alkylene group comprising 2 to 4 carbon atoms. The diester solvent is advantageously the compound Rhodiasolv® IRIS, which is a mixture comprising 70 to 95 wt% dimethyl 2-methylglutarate, 5 to 30 wt% dimethyl ethylsuccinate, and 0 to 10 wt% dimethyl adipate. Alternatively, the diester solvent is advantageously the compound Rhodiasolv® RPDE, which is a mixture comprising 40 to 95 wt% dimethyl glutarate, 5 to 60 wt% dimethyl succinate, and 0 to 30 wt% dimethyl adipate. Surfactant As mentioned above, the agrochemical composition according to the invention also comprises a surfactant system comprising a non-ionic surfactant and an anionic surfactant. It has been discovered that particularly good results have been obtained when the surfactant weight ratio L L7 ίΠΠ / ίΖηΖ / E / YΙ non-ionic with respect to anionic surfactant is greater than 1, preferably greater than 2, more preferably greater than 3. Non-ionic Suitable nonionic surfactants are known in the art, and include, for example, alkylyl alkoxylates, such as alkoxylated alkylphenols, alkarylphenol alkoxylates, such as alkoxylated tristyrylphenols, alkoxylated triglycerides, such as alkoxylated fatty acids or castor oils, sorbitan fatty acid esters, such as sorbitan monooleate, alkoxylated sorbitan fatty acid esters, such as polyoxyethylene (20) sorbitan monopalmitate, alkoxylated fatty alcohols, such as ethoxylated stearyl alcohol, alkoxylated fatty acids, such as poly(ethylene glycol) monostearates, alkoxylated fatty acid esters, alkoxylated copolymers, such as ethylene / propylene block copolymers, glycoside surfactants, such as alkylglucosides and alkylpolyglucosides, amine oxides such as cocoamine oxide, alkanolamides such as cocoamide DEA, alkoxylated fatty amines, and mixtures thereof. In the surfactant system according to the invention, the nonionic surfactant is advantageously selected from the group consisting of alkoxylated alkylphenols, alkoxylated tristyrylphenols, fatty acids or alkoxylated castor oils, sorbitan fatty acid esters, fatty alcohols L L7 ίΠΠ / ίΖηΖ / E / YΥΙ alkoxylated, alkoxylated fatty amines, and mixtures thereof, preferably alkoxylated tristeyrylphenol. Anionic Examples of anionic surfactants include, but are not limited to, the following: • alkylsulfonic acids or arylsulfonic acids, optionally substituted with one or more hydrocarbon-based groups, and whose acid function is partially or totally salted, such as C8-C50 alkylsulfonic acids, benzenesulfonic acids or naphthalenesulfonic acids, more particularly C8-C30, preferably C10-C22 substituted with one to three C1-C30 alkyl groups, preferably C4-C16, and / or C2-C30 alkenyl groups, preferably C4-C16; notably alkylbenzene sulfonates, and more preferably dodecylbenzene sulfonate; • monoesters or diesters of alkylsulfosuccinic acids, the linear or branched alkyl portion of which is optionally substituted with one or more linear or branched C2-C4 hydroxylated and / or alkoxylated groups (preferably ethoxylated, propoxylated, or ethopropoxylated); notably sulfosuccinates, • phosphate esters selected more particularly from those comprising at least one linear or branched, saturated, unsaturated, or aromatic hydrocarbon-based group containing from 8 to 40 and preferably from 10 to 30 atoms of L L7 iРР / įЖηЖ / E / YI carbon, optionally substituted with at least one alkoxylated group (ethoxylated, propoxylated, or ethoxylated). They further comprise at least one monoesterified or diesterified phosphate ester group, such that one or two free or partially or fully salted acid groups may be present. The preferred phosphate esters are of the type such as monoesters and diesters of phosphoric acid and alkoxylated mono-, di-, or tristyrylphenol (ethoxylated and / or propoxylated), or of alkoxylated mono-, di-, or trialkylphenol (ethoxylated and / or propoxylated), optionally substituted with one to four alkyl groups; of phosphoric acid and an alkoxylated C8-C30, and preferably C10-C22, alcohol (ethoxylated or ethoxypropoxylated); of phosphoric acid and of a C8-C22, and preferably C10-C22 non-alkoxylated alcohol; notably alkoxylated alkylaryl phosphates, alkoxylated alcohol phosphates and alkoxylated triestyrylphenol phosphates; • Sulfate esters obtained from saturated or aromatic alcohols, optionally substituted with one or more alkoxylated groups (ethoxylated, propoxylated, or ethopropoxylated), and for which the sulfate functional groups are in the form of a free acid or partially or totally neutralized. By way of example, mention may be made of sulfate esters obtained more particularly from saturated or unsaturated C8-C20 alcohols, which may comprise from 1 to 8 alkoxylated units (ethoxylated, propoxylated, or ethopropoxylated); L L7 ίΠΠ / ίΖηΖ / E / YI sulfate esters obtained from polyalkoxylated phenol, substituted with 1 to 3 saturated or unsaturated C2C30 hydroxycarbon-based groups, and in which the number of alkoxylated units is between 2 and 40; sulfate esters obtained from mono-, di- or tristyrylphenol polyalkoxylated in which the number of alkoxylated units ranges from 2 to 40; notably alkoxylated distyrylphenol sulfates; • and mixtures thereof. Anionic surfactants can be in acid form (they are potentially anionic) or in a partially or fully salted form, with a counterion. The counterion can be an alkali metal, such as sodium or potassium, an alkaline earth metal, such as calcium, or an ammonium ion of the formula N(R)4+, where R, which can be identical or different, represents a hydrogen atom or a C1-C4 alkyl radical optionally substituted with an oxygen atom. In the agrochemical composition according to the invention, the anionic surfactant is preferably selected from the group consisting of alkylbenzene sulfonates, alkoxylated alkylyl phosphates, alkoxylated alcohol phosphates, sulfosuccinates, alkoxylated tristyrylphenol phosphates, alkoxylated distyrylphenol sulfates, and mixtures thereof, preferably alkylbenzene sulfonates, more preferably dodecylbenzene sulfonate. L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ Other additives Water The agrochemical composition is preferably a concentrated composition, meaning that it preferably does not contain large quantities of water. Normally, the water content is generally less than 10 percent, preferably less than 5 percent by weight, and more preferably less than 1 percent by weight. The agrochemical composition is preferably a liquid formulation, for example, in the form of an emulsifiable concentrate (EC), dispersible concentrate (DC), or an oil dispersion (OD) formulation. An oil dispersion is understood to mean that the fluid used as the continuous phase may be immiscible with water or miscible with water. The scope of the invention does not exclude the production of solid agrochemical compositions, such as formulations in which a liquid comprising the agrochemical composition is supported by a mineral and / or dispersed in a solid matrix. In this case, a wettable powder (WP) is obtained, and when granulated, water-dispersible granules (WDG), water-soluble granules (WSG), or water-emulsifiable granules (WEG) are obtained. The agrochemical composition may quite obviously include certain components (or other additives) other than the combination of herbicidal substances, the L L7 ίΠΠ / ίΖηΖ / E / YI solvent(s), the surfactant system and optional water. May include, in particular viscosity modifiers, antifoaming and defoaming agents, in particular silicone antifoaming and defoaming agents, antirebound agents, antileaching agents, inert fillers, in particular mineral fillers, antifreeze agents, stabilizers, colorants, emetic agents, adhesives (adhesion promoters), etc. Rheological additives / thickeners In a particular embodiment, the agrochemical composition according to the invention may further contain rheological / thickening additives, preferably a mineral suspending agent, more preferably selected from the group consisting of silicas, surface-treated silicate, mixed oxides and mixtures thereof. Wetting / dispersing agent In some embodiments, the agrochemical composition according to the invention may also contain other surfactants as wetting and / or dispersing agents, different from the non-ionic or anionic surfactant mentioned above, and preferably selected from the group consisting of alkoxylated C8-C24 alcohols, alkoxylated sorbitan esters, alkylnaphthalene sulfonates, condensed alkylnaphthalene sulfates, alkoxylated alcohol phosphates, alkoxylated phosphates, phenylsulfonates, phosphates of L L7 ίΠΠ / ίΖηΖ / E / YΥΙ tristyrylphenol alkoxylates, tristyrylphenol alkoxylate sulfates, distyrylphenol alkoxylate sulfates, polycarboxylates, acrylic polymers and mixtures thereof, more preferably ethoxylated isodecyl alcohol. Concentrations of the different components of the composition The agrochemical composition according to the invention advantageously comprises at least 1% by weight, preferably at least 5% by weight, more preferably at least 10% by weight of herbicidal substance (i.e., a combination of a phenylhydrazine derivative and a triketone) in relation to the total weight of the agrochemical composition. The agrochemical composition may advantageously comprise: a) from 1 percent to 80 percent, preferably from 10 percent to 60 percent by weight, of herbicidal substance (i.e., a combination of a phenylhydrazine derivative and a triketone), relative to the total weight of the agrochemical composition; b) from 10 percent to 80 percent, preferably from 20 percent to 60 percent by weight, of solvent according to the invention, relative to the total weight of the agrochemical composition; c) from 5 percent to 50 percent, preferably from 10 percent to 35 percent by weight, of surfactant system according to the invention, relative to the total weight of the agrochemical composition. L L7 ίΠΠ / ίΖηΖ / E / YΥΙ with the total weight of the agrochemical composition, d) from 0 percent to 10 percent, preferably from 1 percent to 5 percent by weight, of rheological additives / thickeners according to the invention, in relation to the total weight of the agrochemical composition, e) from 0 percent to 25 percent, preferably from 5 percent to 20 percent by weight, of a wetting / dispersing agent other than the surfactant system according to the invention, in relation to the total weight of the agrochemical composition, f) from 0 percent to 10 percent, preferably from 0 percent to 5 percent and more preferably less than 1 percent by weight of water. Nature of the composition In a first embodiment, the agrochemical composition according to the invention is a dispersion of the tricetone in a solution comprising the phenylhydrazine derivative, the solvent, and the surfactant system. In a second embodiment, the agrochemical composition according to the invention is a homogeneous solution of the tricetone and the phenylhydrazine derivative in the solvent and surfactant system. Procedure Known conventional methods can be implemented to prepare plant protection formulations or mixtures of L L7 ίΠΠ / ίΖηΖ / E / YΥΙ solvents. It is possible to undertake this simply by mixing the constituents. This is why the present invention relates to a process for preparing the agrochemical composition according to the invention and described above, in which the phenylhydrazine derivative, the tricetone, the surfactant system, and the solvent are mixed together. In a first embodiment of the procedure according to the invention, the following steps are performed: The phenylhydrazine derivative and surfactant system are mixed with the solvent and the tricetone is dispersed in a solution comprising the phenylpyridazine, the solvent and the surfactant system; the tricetone is micronized, preferably through a wet milling stage. In a second embodiment of the procedure according to the invention, the following steps are performed: The phenylhydrazine derivative and surfactant system are mixed with the solvent, and the tricetone is solubilized in a solution comprising the phenylpyridazine, the solvent, and the surfactant system, forming an end-user emulsion or suspoemulsion. The previously defined agrochemical composition is L L7 ίΠΠ / ίΖηΖ / E / YI generally in the form of a concentrated composition, which is intended to be spread over a cultivated field or a field to be cultivated, most often after dilution with water, in order to obtain a diluted composition. The dilution is generally carried out by the farm worker before use, and an emulsion or suspoemulsion will be formed. The present invention therefore also provides an agrochemical emulsion or suspoemulsion obtainable by diluting the agrochemical composition defined above, preferably with a dilution ratio ranging from 0.1:99.9 to 5.0:95.0, preferably from 0.2:99.8 to 3.0:97.0, and more preferably from 0.3:99.7 to 1.0:99.0. Dilution is generally carried out directly in a tank, for example, the tank of a device designed to spread the compound. This does not preclude the possibility that the farm operator may add other plant protection products, such as fungicides, herbicides, pesticides, insecticides, fertilizers, tank-mix adjuvants, etc. The dilution ratios and the quantities to be applied to the field generally depend on the plant protection product and the desired treatment dose (this can be determined by the farm operator). Method for controlling unwanted vegetation The final aspect of the present invention is to propose a L L7 ίΠΠ / ίΖηΖ / E / YΥΙ method of controlling unwanted vegetation, comprising applying an effective amount of the above-defined agrochemical composition or of the above-described agrochemical emulsion or suspoemulsion to plants (crop or the 5 desired ones), seeds or to the soil. The examples of implementation of the invention below are provided merely for illustrative purposes, and may not in any case be of a limiting nature. EXAMPLES In the experimental section below, the following compounds were used: L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ Origin / Trade Name Function Composition Pyridate tech. Herbicide substance Pyridate >90% Mesotrione tech. Herbicide substance Mesotrione >92% Rhodiasolv® ADMA 10 from Solvay Solvent Diamide comprising N,N-dimethyldecanamide Rhodiasolv® RPDE from Solvay Solvent Diester comprising dimethylglutarate and dimethylsuccinate Rhodiasolv® IRIS from Solvay Solvent Diester comprising dimethyl 2-methylglutarate and dimethyl ethylsuccinate Rhodiasolv® Polarclean from Solvay Solvent Esteramide comprising MeOOC-CH(CH3)-CH2-CH2-CONMe2 and MeOOC-CH(CH2-CH3)-CH2CONMe2.Rhodiasolv ® Li-Tec 2 v by Solvay Dioxolano solvent which includes 2,2-dimethyl-l,3dioxolanomethanol Soprophor® CY / 8 by Solvay Non-ionic surfactant Triestrylphenol ethoxylado Soprophor® 796 / P by Solvay Non-ionic surfactant Polyoxyethylenepolyoxypropyl lenotriestyrylphenol Rhodacal® 60 / BE from Solvay Anionic surfactant 55-70% calcium dodecylbenenosulfonate and 30-45% alcohol Solvesso 150 ND from Exxon Mobil Chemical Aceite Aromatic vinegar (ND for naphthalene needle) Rhodafac® RE / 610-E from Solvay Anionic surfactant Polioxyethylene nonylphenyl ether fosfato Geronol combinació η η. ° 1 Sistema de tensioactivos El 70-80% de triestirilfenol etoxilado, el 8-16% de dodecilbencenosulfonato de calcio, el 4-11% de. L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ alcohol and 5-15% of Solvesso 150 ND Rhodafac combined n n. ° 2 Anionic surfactant 90-95% polyoxyethylene tridecyl ether phosphate, 5-10% C11-14 isotype alcohols, ethoxylated,1-3% orthophosphoric acid Soprophor® 3D33 from Solvay Anionic surfactant Tristyrylphenol ethoxylated phosphate Soprophor TSP / 461 Nonionic surfactant Tristyrylphenol ethoxylated phosphate Alkamuls® BR from Solvay Nonionic surfactant Ethoxylated castor oil Alkamuls® B from Solvay Nonionic surfactant Ethoxylated castor oil Alkamuls® T / 85-V from Solvay Nonionic surfactant Ethoxylated sorbitan trioleate Antarox® 724 / P from Solvay Nonionic surfactant Alkylphenol ethoxylated phosphate Rhodafac® PA / 15 from Solvay Anionic surfactant Ethoxylated alcohol phosphate ester Alkamuls® VO / 2003 from Solvay Nonionic surfactant Mixture of esters of Polyethylene glycol of fatty acids Rhodasurf® 860P from Solvay Dispersing / wetting agent Ethoxylated isodecyl alcohol Aerosil® R202 from Evonik Degussa Rheological / heavy additives Silicones and siloxanes, dimethyl-, reaction products with silica Silcolapse 482 from Elkem Antifoam Based on polydimethylsiloxane oil and silica, L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ The tests performed are conventional tests. □ Suspension capacity is measured according to CIPAC's MT 184 test. □ Storage stability at elevated temperatures is performed according to CIPAC's MT 46.3 test. □ Low temperature storage stability is performed according to CIPAC's MT 39.3 test. □ Stability in dilution (emulsion, suspoemulsion) is adapted from CIPAC's MT 36.3 and MT 180 tests. □ Viscosity (cP) is measured with a Brookfield LV viscometer at 20°C and 20 rpm. □ The miscibility test consists of a visual observation of a simple mixture of two liquids. They are miscible if they form a single phase. STAGE 1 - PREPARATION OF A PYRIDATE EC For this first stage, the miscibility of pyridate tec. in various solvents at a concentration of 16.5% by weight has been tested: L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ Solvent Comment Water Immiscible Rhodiasolv® ADMA 10 Miscible Rhodiasolv® RPDE Miscible Rhodiasolv® IRIS Miscible Rhodiasolv® Polarclean Miscible Rhodiasolv® Li-Tec 2v Miscible Pyridate tec. shows good miscibility in the above solvents after 40 days at room temperature and 54°C. The miscibility of several surfactants in compositions containing pyridate and solvents was tested. The concentration of pyridate (tech.) was 11.0% by weight and the surfactant concentration was 33.5% by weight, up to the L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ 100% by weight with the solvent. Solvent Surfactant System Comment on physical stability in storage at various temperatures Rhodiaso1v® Polarclean Soprophor 796 / P (75%) Rhodafac RE / 610-E (25%) 3 days / all temperatures: Stable 2 weeks / all temperatures: Stable Soprophor 3D33 5 days / 20°C: Cloudy and deposits 2 weeks / 20°C: Cloudy and deposits 3 months / 54°C: Crystallization Geronol combination n.1 3 days / 20°C and 54°C: Stable 2 weeks / 20°C and 54°C: Stable Soprophor TSP / 461 (a 50%) (b 75%) / Soprophor 3D33 (a 50%) (b 25%) 3 days / all temperatures: Stable 2 weeks / all temperatures: Stable Rhodiasolv® Li-Tec 2v Soprophor 796 / P 3 days / all temperatures: Stable 2 weeks / 20°C, 45°C and 54°C: Crystallization Alkamuls BR 2 days / 54°C: Stable 1 week / 54°C: Crystallization Alkamuls B 2 days / 54°C: Stable 3 days / 54°C: Crystallization Alkamuls T / 85-V 2 days / 54°C: Stable 1 week / 54°C: Antarox 724 / P crystallization 2 days / 54°C: Rhodafac PA / 15 precipitate 3 days / 54°C: Stable but significant gas evolution Geronol 3 days / 20°C and 54°C:. Combination No. 1 Stable 2 weeks / 20°C and 54°C: Stable 5 months / 20°C and 54°C: Stable Soprophor 796 / P (25%) Rhodafac RE / 610-E (75%) 3 days / all temperatures: Stable 2 weeks: Stable at 20°C and crystallization at 54°C Rhodiasolv® ADMA 10 Soprophor 796 / P (25%) Rhodafac RE / 610-E (75%) 3 days / all temperatures: Stable 2 weeks / all temperatures: Stable except 54°C with some crystallization Rhodiasolv® RPDE Rhodafac RE / 610-E (100%) 5 days / 20°C and 54°C: Stable 6 days: Stable at 20°C and crystallization at 54°C Soprophor 796 / P (25%) Rhodafac RE / 610-E (75%) 5 days / 20°C and 54°C: Stable 6 days: Stable at 20°C and crystallization at 54°C Soprophor 796 / P (75%) Rhodafac RE / 610-E (25%) 5 days / 20°C and 54°C: Stable 6 days / 20°C and 54°C: Stable L L7 iРР / iZηZ / E / YI *All temperatures mean -5°C, 20°C, 45°C and 54°C. When some temperatures / storage times are not mentioned, it is because they have not been measured. Among these formulations, only those formulations that have a surfactant system comprising at least one anionic surfactant and at least one non-ionic surfactant lead to physically stable formulations. Two systems are selected (Rhodiasolv® Polarclean with Soprophor 796 / P (75%) / Rhodafac RE / 610-E (25%) and Rhodiasolv® Li-Tec 2v with Geronol combination no. 1) for additional formulation. These 2 formulations are stable even after 30 days at 54°C. Different concentrations have been tested for each of the 5 systems: L L7 Lnn / LZnZ / E / Yli Pyridate formulation in Rhodiasolv® Polarclean in Rhodiasolv® Li-Tec 2v Pyridate (90%) 50.0% 50.0% Rhodiasolv Polarclean 26.5% 16.5% Rhodiasolv LiTec 2v 26.5% 16.5% Soprophor 796 / P 5.9% 8.4% Rhodafac RE / 610-E 17.6% 25.1% Geronol combination no. 1 23.5% 33.5% Results Dilution (at 1% in deionized water) (t=0min) White emulsion White emulsion White emulsion White emulsion Suspension capacity (at 1% in deionized water) 75% 98% 72% 95% The best results in terms of emulsification and suspension capacity are obtained with a surfactant quantity of 33.5% by weight in relation to the total weight of the formulation (without mesotrione). Adjustments have therefore been made to the pyridate concentration: Pyridate formulation in Rhodiasolv® Polarclean in Rhodiasolv® Li-Tec 2v Pyridate 99.9 g / 1 Pyridate 99.9 g / 1 Pyridate 450 g / 1 % g / i % g / i % g / i Pyridate (90%) 10.2% 110.4 10.2% 110.7 50.0% 499.95 Rhodiasolv® Polarclean 56.3% 609.3 Rhodiasolv® Li-Tec 2v 56.3% 604.2 16.5% 183.30 Soprophor 796 / P 8.4% 91.1 Rhodafac RE / 610-E 25.1% 272.1 Geronol combination #1 33.5% 360.2 33.5% 372.20 Tests performed on the previous formulations showed the best results: Formulation in Rhodiasolv® Polarclean in Rhodiasolv® Li-Tec 2v Pyridate 99.9 g / 1 Pyridate 99.9 g / 1 Pyridate 450 g / 1 Appearance Translucent yellow Translucent yellow Translucent yellow Dilution (at 1% in deionized water) Good dispersion, white emulsion Good dispersion, white emulsion Light white deposit at the bottom Suspension capacity (at 1% in deionized water) 100% 95% 96% Storage 20 °C / 3 months translucent homogeneous pourable translucent homogeneous pourable Translucent, homogeneous pourable 45 °C / 6 weeks translucent, homogeneous, pourable translucent, homogeneous, pourable Translucent, homogeneous, pourable 54 °C / 2 months translucent, translucent, translucent weeks homogeneous, pourable homogeneous, pourable homogeneous, pourable -5 °C / 2 weeks translucent, homogeneous, pourable translucent, homogeneous, pourable Translucent, homogeneous, pourable L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ STEP 2 - ADDITION OF MESOTRIONE: Mesotrione has been introduced into both Rhodiasolv® Li-Tec 2v and Rhodiasolv® Polarclean. Mesotrione is not soluble in Rhodiasolv® Li-Tec 2v and is soluble in (for example, at a concentration of 30 g / L) Rhodiasolv® Polarclean. Two oil dispersions of mesotrione in pyridate formulations with different pyridate / mesotrione ratios have been developed and tested. These compositions and results are presented below. Formulation 1 - OD of pyridate 95 g / 1 mesotrione 30 g / 1 Components % g / i Nature Pyridate tec. 9.90 106.3 pa Rhodiasolv Li-Tec 2v 51.40 552.0 Solvent Geronol combination no. 1 33.50 359.8 Surfactant combination Mesotrione tec. 2.80 30.1 pa Aerosil R202 2.30 24.7 Rheological agent Silcolapse 482 0.10 1.1 Antifoam Test Result Appearance after 2 months at 20°C Stable Appearance after 4 weeks at 45°C Stable - phase separation <5% Appearance after 12 weeks at 35°C Stable - traces of phase separation Appearance after 2 weeks at - Stable 5°C Viscosity (cP) 2200 Dilution (at 1% in deionized water) to Stable and translucent white 30min Stable and translucent white 2h Stable and white 24h Stable and white Suspension capacity (%) at to at TA (%) (at 1% in deionized water) 98 Suspension capacity (%) after 14 weeks at TA (%) (at 1% in CIPAC D water) 100 Suspension capacity (%) after 14 weeks at 35°C (%) (at 1% in CIPAC D water) 98 L L7 Lnn / LZnZ / E / Yli Formulation 2 - QD of pyridate 300 g / 1 mesotrione 45 g / 1 Components % g / i Nature Pyridate tec. 30.60 332.6 pa Rhodiasolv® Li-Tec 2v 28.50 309.8 Solvent Geronol combination no. 1 19.90 216.3 Surfactant combination Mesotrione tec. 4.20 45.7 pa Aerosil® R202 2.30 25.0 Rheological agent Rhodasurf® 860 / P 14.00 152.2 Wetting agent Silcolapse® 482 0.50 5.4 Antifoam Test Result Appearance after 2 months at 20°C Stable Appearance after 4 weeks at 45°C Stable, phase separation <5% Appearance after 12 weeks at 35°C Stable - traces of phase separation Appearance after 2 weeks at 5°C Stable Viscosity (cP) 2230 Dilution (at 1% in deionized water) to Stable and white 30min Stable and white 2h Stable and white 24h Stable and white Suspension capacity (%) at TA (%) in tap water 94 Suspension capacity (%) after 27 weeks at TA (at 1% in CIPAC D water) 98 Suspension capacity (%) after 27 weeks at 35°C (at 1% in CIPAC D water) 97 L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ After 18 weeks at 30°C, there is less than 5% chemical degradation of pyridate and mesotrione. The previous formulations 1 and 2 show good characteristics of physical and chemical stability, dilution, and suspension capacity. -k ★ -k Three emulsifiable concentrate (EC) formulations of mesotrione and pyridate have been developed and tested. The 10 compositions and results are presented below. Formulation 3 - EC - pyridate 100 g / 1 and mesotrione 37 g / 1 Components % Nature Pyridate tech. 10.15 pa Rhodiasolv® Polarclean 53.87 Solvent Rhodafac combination no. 2 24.40 Anionic surfactant Mesotrione tech. 3.45 pa Soprophor 796 / P 8.13 Non-ionic surfactant L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ Test Result Appearance after 2 days at -5°C, 20°C, 45°C and 54°C Stable (no sediment) Appearance after 2 weeks at 5°C, 20°C, 45°C and 54°C Stable (no sediment) Dilution (at 1% in deionized water) to Stable and translucent - no deposit 30min Stable and translucent - no deposit lh Stable and translucent - no deposit Formulation 4 - EC - pyridate 100 g / 1 and mesotrione 37 g / 1 Components % Nature Pyridate tech. 10.13 pa Rhodiasolv ® Polarclean 53.58 Solvent Rhodafac combination no. 2 16.03 Anionic Surfactant Mesotrione tech. 3.43 pa Soprophor 796 / P 16.83 Non-ionic Surfactant Test Result Appearance after 11 weeks at 35°C Stable (no sediment) Appearance after 6 weeks at 45°C Stable (no sediment) Appearance after 2 weeks at -5°C Stable (no sediment) Appearance after 11 weeks at 20°C Stable (no sediment) Dilution (at 1% in CIPAC D water) to Stable and translucent - no deposit 3 0min Stable and translucent - no deposit 1h Stable and translucent - no deposit L L7 ίΠΠ / ίΖηΖ / Ε / ΥΙ Formulation 5 - EC - pyridate 100 g / 1 and mesotrione 37 g / 1 Components % Nature Pyridate tech. 10.11 pa Rhodiasolv ® Polarclean 53.65 Solvent Rhodafac combination no. 2 8.26 Anionic Surfactant Mesotrione tech. 3.46 pa Soprophor 796 / P 24.52 Non-ionic Surfactant Test Result Appearance after 11 weeks at 35°C Stable (no sediment) Appearance after 6 weeks Stable (no sediment) At 45°C Appearance after 2 weeks at -5°C Stable (no sediment) Appearance after 11 weeks at 20°C Stable (no sediment) Dilution (at 1% in water CIPAC D) to Stable and translucent - no deposit 30min Stable and translucent - no deposit 1h Stable and translucent - no deposit L 17 Lnn / ίΖΠΖ / Β / ΥΙΛΙ Formulations 3, 4, and 5 show good physical stability in storage and suitable dilution characteristics. -kkkk One emulsifiable concentrate of tembotrione and pyridate and one oil dispersion of tembotrione in pyridate have been developed and tested. These compositions and results are presented below. Formulation 6 - EC - pyridate 300 g / 1 tembotrione 13.33 g / 1 Components % Nature Pyridate tec. 29.89 pa Rhodiasolv Li-tec 2v 35.24 Solvent Geronol combination no. 1 33.53 Surfactant Tembotrione 1.29 pa SAG 1572 0.05 Antifoam Test Result Appearance after 12 weeks at 35°C Stable Appearance after 6 weeks at 45°C Stable Appearance after 4 weeks at F / T Stable Appearance after 2 weeks at -5°C (with seed) Stable Appearance after 12 weeks at 20°C Stable Dilution (at 1% in water CIPAC D) to Stable and translucent without deposit 3 0min Stable and translucent traces of deposits 2h Stable and translucent traces of deposits L 17 Lnn / ίΖΠΖ / Β / ΥΙΛΙ Formulation 7 - QD - pyridate 150 g / 1 tembotrione 100 g / 1 Components % Nature Pyridate tec. 15.01 pa Rhodiasolv Li-tec 2v 39.54 Solvent Geronol combination no. 1 33.53 Surfactant Tembotrione 9.41 pa Aerosil R202 2.13 Rheological agent Silcolapse 482 0.36 Antifoam Test Result Viscosity (cP) 2100 Appearance after 12 weeks at 35°C Stable - upper syneresis <16% Appearance after 6 weeks at 45°C Stable - upper syneresis <9% Appearance after 4 weeks at F / T Stable - upper syneresis <7% Appearance after 1 week at -5°C Stable Appearance after 12 weeks at 20°C Stable - upper syneresis <12% Dilution (at 1% in CIPAC D water) to White emulsion - trace deposits 30 min White emulsion - 0.5 ml of deposits 2 h White emulsion - 0.6 ml of deposits Suspension capacity (%) at tO (%) (at 1% in CIPAC D water) 70% L 17 Lnn / ίΖΠΖ / Β / ΥΙΛΙ Formulations 6 and 7 show good physical stability characteristics in storage and dilution. It is hereby stated that, as of this date, the best method known to the applicant for putting the aforementioned invention into practice is the one that is clear from the present description of the invention.

Claims

CLAIMS 1. An agrochemical composition comprising: - as a herbicidal substance: a combination of a phenylhydrazine derivative and a triketone; - a solvent selected from the group consisting of dioxolanes, N,N-dialkylamides, diesters, esteramides and mixtures thereof; and - a surfactant system comprising a non-ionic surfactant and an anionic surfactant.

2. Agrochemical composition according to claim 1, wherein the phenylhydrazine derivative is selected from the group consisting of pyridate, pyridafol, pyrazone and mixtures thereof, preferably pyridate.

3. Agrochemical composition according to any one of the preceding claims, wherein the tricetone is selected from the group consisting of mesotrione, tembotrione, sulcotrione, tefuryltrione and mixtures thereof, preferably mesotrione.

4. An agrochemical composition according to any one of the preceding claims, wherein the solvent is a dioxolane of formula I, wherein R1 and R2 are independently selected from the group consisting of: a C1-C12 alkyl, a C4-C12 cycloalkyl, or a linear or branched aryl group. R3 is H, a linear or branched alkyl, a cycloalkyl, or a -C(=O)R4 group, R4 being a linear or branched alkyl or cycloalkyl group.

5. Agrochemical composition according to claims 1 to 3, wherein the solvent is a esteramide of formula II R5OOC-A-CONR6R7 (II) wherein: R5 is a radical selected from saturated or unsaturated, linear or branched, optionally cyclic, optionally aromatic hydrocarbon-based radicals having an average number of carbon atoms ranging from 1 to 36; Re and R7, which may be identical or different, are each radicals selected from saturated or unsaturated, linear or branched, optionally cyclic, optionally aromatic, optionally substituted hydrocarbon-based radicals having an average number of carbon atoms ranging from 1 to 36, provided that Re and R7 can together optionally form a ring member that is optionally substituted and / or optionally contains a heteroatom;and A is a linear or branched divalent alkyl radical having an average number of carbon atoms ranging from 2 to 12.; 6. Agrochemical composition according to any one of the preceding claims, wherein the weight ratio of non-ionic surfactant to anionic surfactant is greater than 1, preferably greater than 2, more preferably greater than 3.

7. Agrochemical composition according to any one of the preceding claims, wherein the nonionic surfactant is selected from the group consisting of alkoxylated alkylphenols, alkoxylated tristyrylphenols, alkoxylated fatty acids or castor oils, sorbitan fatty acid esters, alkoxylated fatty alcohols, alkoxylated fatty amines, and mixtures thereof, preferably alkoxylated tristyrylphenol.

8. Agrochemical composition according to any one of the preceding claims, wherein the anionic surfactant is selected from the group consisting of alkylbenzene sulfonates, alkoxylated alkylyl phosphate esters, alkoxylated alcohol phosphate esters, sulfosuccinates, alkoxylated tristyrylphenol phosphates, alkoxylated distyrylphenol sulfates, and mixtures thereof, preferably alkylbenzene sulfonates, more preferably dodecylbenzene sulfonate.

9. Agrochemical composition according to any one of the preceding claims, wherein it further contains rheological / thickening additives, preferably a mineral suspending agent, more preferably selected from the group consisting of silicas, surface-treated silicate, mixed oxides and mixtures thereof.

10. An agrochemical composition according to any one of the preceding claims, wherein it further contains other surfactants as wetting and / or dispersing agents, other than non-ionic or anionic surfactant, preferably selected from the group consisting of alkoxylated C8-C24 alcohols, alkoxylated sorbitan esters, alkylnaphthalene sulfonates, condensed alkylnaphthalene sulfonates, alkoxylated alcohol phosphates, alkoxylated phosphates, phenylsulfonates, alkoxylated tristyrylphenol phosphates, alkoxylated tristyrylphenol sulfates, alkoxylated distyrylphenol sulfates, polycarboxylates, acrylic polymers and mixtures thereof, more preferably ethoxylated isodecyl alcohol.

11. Agrochemical composition according to any one of the preceding claims, said composition comprising at least 1% by weight, preferably at least 5% by weight, more preferably at least 10% by weight of herbicidal substance in relation to the total weight of the agrochemical composition.

12. Agrochemical composition according to any one of the preceding claims, wherein the composition is a dispersion of the tricetone in a solution comprising the phenylhydrazine derivative, the solvent, and the surfactant system.

13. Agrochemical composition according to claims 1 to 11, wherein the composition is a homogeneous solution of the tricetone and the phenylhydrazine derivative in the solvent and the surfactant system.

14. A process for preparing the agrochemical composition according to claim 1 to 13, wherein the phenylhydrazine derivative, the tricetone, the surfactant system and the solvent are mixed together.

15. A process according to claim 14, comprising the following steps: L L7 Lnn / LZnZ / E / Yli 4 9 - the phenylhydrazine derivative and the surfactant system are mixed with the solvent and, - the tricetone is dispersed in a solution comprising the phenylpyridazine, the solvent and the surfactant system, - the tricetone is micronized, preferably through a wet milling step.

16. A process according to claim 14, comprising the following steps: - the phenylhydrazine derivative and the surfactant system are mixed with the solvent and, - the tricetone is solubilized in a solution comprising the phenylpyridazine, the solvent and the surfactant system.

17. An agrochemical emulsion or suspoemulsion obtainable by diluting the agrochemical composition according to claim 1 to 13, preferably the dilution ratio ranges from 0.1:99.9 to 5.0:95.0, preferably from 0.2:99.8 to 3.0:97.0 and more preferably from 0.3:99.7 to 1.0:99.

0.

18. A method for controlling unwanted vegetation, comprising applying an effective amount of the agrochemical composition according to claim 1 to 13 or of the agrochemical emulsion or suspoemulsion according to claim 17 to plants (crop or desired), seeds or soil.