AN IMPROVED HERBICIDE FORMULATION

Abstract

The present invention provides novel stain-resistant ZC formulations comprising pendimethalin and a co-herbicide. The formulation combines pendimethalin and co-herbicides in a stable form that minimizes degradation of the active ingredients, providing a broader spectrum of weed control.

Description

AN IMPROVED HERBICIDE FORMULATION FIELD OF INVENTION: The present invention relates to herbicidal compositions. More particularly, the present invention relates to ZC formulations comprising pendimethalin. DETAILS OF THE ORIGINAL APPLICATION This application is a patent addition to Indian Application No. 2251 / MUM / 2011 filed on August 10, 2011, and PCT Application No. PCT / IB2011 / 002280 published under WO2013021229 A1 or a continuation in part to U.S. Application No. 14 / 238,009, the contents of all of which are incorporated herein in their entirety by reference. BACKGROUND OF THE PREVIOUS TECHNIQUE The type of herbicide formulation plays an important role in the effectiveness of weed control. Different types of herbicide formulations aim to increase the herbicide's efficacy so that the active ingredient is delivered to the weed with maximum effectiveness, minimal waste, and a prolonged residual effect. Combining two active ingredients can sometimes lead to incompatibility. Physical and biological incompatibility is not uncommon, for example, insufficient stability of a combined formulation, decomposition of one active ingredient, or antagonism between the active ingredients. Incompatibility can result in the mixture forming a precipitate, gel, or flakes that settle and render the herbicide mixture and container unusable. This will also result in inefficient spraying of the pesticide, leading to low efficacy. Therefore, it is important for formulators to prepare stable formulations that allow two incompatible active ingredients to be combined into a single formulation, resulting in a favorable active profile, high stability, and, in some cases, improved synergy, enabling a reduced application rate compared to applying the active compounds individually.Therefore, there is a need in the technique for a formulation that is stable, especially when combining two incompatible active compounds, which provides a broader spectrum of control while reducing the application rate. Herbicide combinations are used for effective and economical weed control. These combinations offer advantages such as a broad spectrum of herbicidal activity, synergistic effects, prevention of herbicide degradation due to the presence of the second herbicide, and reduced herbicide application rates. These herbicide combinations can be prepared by tank-mixing the individual herbicides at the desired rates just before application. However, regulating the rates of individual herbicides in tank-mixed combinations is a problem for many farmers, who often tend toward herbicide overdosing, leading to undesirable effects on field crops. Therefore, it is preferable to prepare formulations comprising the herbicide combinations at the time of manufacture. These formulations and their preparation suffer due to the complication of mutual degradation and incompatibility of the herbicides when they are presented and stored in the same formulation for an extended period. It is often a challenge for a skilled formulator to prepare a stable composition comprising a combination of two or more active ingredients. ZC formulations are a combination of capsule suspension and suspension concentrate such that the formulation contains a stable aqueous suspension of microcapsules and solid fine particles (in an aqueous phase), each of which contains at least one active ingredient. Pendimethalin is a dinitroaniline herbicide. It is a selective herbicide that controls certain broadleaf weeds and grass species in both cultivated and non-cultivated areas. It is applied to the soil in the pre-planting, pre-emergence, and post-emergence stages using ground and aerial equipment. It is a low-melting-point active ingredient with negligible vapor pressure, and it is notorious for staining plants and all other raw materials it comes into contact with. Application PCT / IB2011 / 002280 discloses a capsule suspension comprising microcapsules in an organic phase and an aqueous phase that optionally comprises a second herbicide. The microcapsules encapsulate pendimethalin. The aqueous phase includes an alkali or alkaline earth metal salt of an organic acid. This application describes the second herbicide as either microencapsulated with pendimethalin, unencapsulated, or separately microencapsulated and mixed with microencapsulated pendimethalin. The second herbicide is predominantly clomazone or a volatile herbicide such as 2,4-D esters, MCPA esters, triclopyr, or picloram. This application does not provide for any other combining agent for encapsulated pendimethalin. Pendimethalin is known to be incompatible with several classes of herbicides due to its physical characteristics, which lead to unstable formulations. It is also known that other well-known water-based formulations do not work well with pendimethalin. Therefore, there is a need in the field for stable pendimethalin formulations that are compatible with water-based formulations. a. Provide pendimethalin formulations that do not stain with a coercive herbicide. b. Provide a physically stable formulation of pendimethalin with a co-active herbicide. c. Provide a pendimethalin formulation with a co-active that has a prolonged herbicidal effect. d. Provide an environmentally friendly, water-based pendimethalin formulation with a co-active herbicide e. Provide a pendimethalin formulation that overcomes incompatibility with other active ingredients. The present invention, therefore, aims to solve the problem of incompatibility and stability with the use of ZC formulations, specifically for actives such as pendimethalin when combined with herbicides that are otherwise known to be incompatible with pendimethalin. The embodiment of the present invention may improve one or more of the problems mentioned above: BRIEF DESCRIPTION OF THE INVENTION A suspension comprising particles of a first herbicide selected from the group consisting of sulfonylurea herbicides, tanzinone herbicides, imidazolinone herbicides, triazine herbicides, anilide herbicides, sulfonamide herbicides, organophosphate herbicides, amide herbicides, or alkanamide herbicides combined with a suspension of pendimethalin microcapsules in an aqueous phase, said microcapsules comprising a herbicidally effective amount of pendimethalin encapsulated within a polyurea polymer wall, said polyurea polymer wall constituting approximately 1% to approximately 20% by total weight of the suspension, said aqueous phase comprising at least one alkali or alkaline earth metal salt of an organic acid selected from the group consisting of acetic acid, propionic acid, citric acid, fumaric acid, tartaric acid, oxalic acid, succinic acid, valeric acid, etc. malonic, glutaric acid,adipic acid and italic acid, wherein said at least one alkali or alkaline earth metal salt of an organic acid is present in an amount ranging from approximately 2% to approximately 55% by weight of the suspension; and wherein said first herbicide exhibits improved physicochemical stability in the presence of said encapsulated pendimethalin. DETAILED DESCRIPTION OF THE INVENTION It has now been found that encapsulated pendimethalin physicochemically stabilizes a suspension concentrate of the first herbicide contemplated according to the present invention, which is otherwise known to be incompatible with pendimethalin. ροοζηη / ζζηζ / Β / γυ Therefore, in this respect, the present invention provides a ZC composition comprising: (a) microencapsulated pendimethalin; and (b) a suspension concentrate of a co-herbicide. Therefore, in one aspect, the present invention provides a suspension comprising particles of a first herbicide selected from the group consisting of sulfonylurea herbicides, triazinone herbicides, imidazolinone herbicides, triazine herbicides, anilide herbicides, sulfonamide herbicides, organophosphate herbicides, amide herbicides, or alkanamide herbicides combined with a suspension of pendimethalin microcapsules in an aqueous phase, said microcapsules comprising a herbicidally effective amount of pendimethalin encapsulated within a polyurea polymer wall, said polyurea polymer wall constituting approximately 1% to approximately 20% by total weight of the suspension, said aqueous phase comprising at least one alkali or alkaline earth metal salt of an organic acid selected from the group consisting of acetic acid, propionic acid, citric acid, fumaric acid, tartaric acid, etc. oxalic acid,succinic acid, valeric acid, malonic acid, glutaric acid, adipic acid, and italic acid, wherein said at least one alkali or alkaline earth metal salt of an organic acid is present in an amount ranging from approximately 2% to approximately 55% by weight of the suspension; and wherein said first herbicide exhibits improved physicochemical stability in the presence of said encapsulated pendimethalin. In one modality, the preferred suspension is a ZC formulation. Therefore, the embodiments of the present invention can provide a composition comprising ZC formulations comprising encapsulated pendimethalin and at least one co-herbicide. The present inventors have surprisingly discovered that, when combined with active ingredients that are incompatible with pendimethalin when formulated as conventional formulations such as EC, WDG, etc., they can be combined to form stable formulations when combined in a ZC formulation. Therefore, it was found that combining a suspension concentrate of these herbicides with encapsulated pendimethalin physicochemically stabilized the resulting ZC formulation, a result that had not previously been satisfactorily achieved for these herbicides. Pendimethalin has two crystallomorphic forms: triclinic pendimethalin I (P1—), a thermodynamically stable, orange form, and monoclinic pendimethalin II (P21 / c), a metastable, bright yellow form. The latter typically forms first upon cooling molten pendimethalin, while the orange form develops through a polymorphic phase transition that occurs slowly after long-term storage of the yellow form at temperatures below its melting point. This polymorphic phase transition always leads to particle size growth. This results in the loss of formulation properties such as suspendability, wet sieve retention, etc., and also gives rise to a unique problem with the use of pendimethalin: staining. Pendimethalin is known to exhibit incompatibilities when combined with certain active compounds. These formulations face problems such as active compound incompatibility, commodity staining, crystallomorphic transition, particle size growth, and loss of the formulation's physicochemical properties on the shelf. Tank mixing of the formulation also leads to flocculation, and pesticide separation results in formulation ineffectiveness or crop damage. For example, when pendimethalin 456 CS was mixed with metribuzin 75% DF in a tank mix, flocculation occurred, rendering the mixture useless. This was observed when the pendimethalin 456 CS formulation used was surrounded by H₂O, a formulation that included an inorganic salt prior to encapsulation. The inorganic salt was found to increase water hardness, leading to flocculation in the presence of metribuzin 75% DF. Therefore, in one embodiment, the present invention provides a ZC composition comprising: a suspension concentrate comprising particles of a first herbicide selected from the group consisting of sulfonylurea herbicides, triazinone herbicides, imidazolinone herbicides, triazine herbicides, anilide herbicides, sulfonamide herbicides, organophosphate herbicides, amide herbicides, or alkanamide herbicides; combined with a suspension of pendimethalin microcapsules in an aqueous phase, said microcapsules comprising a herbicidally effective amount of pendimethalin encapsulated within a polyurea polymer wall, said polyurea polymer wall constituting approximately 1% to approximately 20% by weight of the suspension, said aqueous phase comprising at least one alkali or alkaline earth metal salt of an organic acid selected from the group consisting of acetic acid, propionic acid, citric acid, fumaric acid, tartaric acid, oxalic acid, succinic acid, valeric acid, malonic acid, glutaric acid, adipic acid, and italic acid, wherein said at least one alkali or alkaline earth metal salt of an organic acid is present in an amount ranging from approximately 2% to approximately 55% by weight of the suspension;and ροοζηη / ζζηζ / Β / γι where said first herbicide shows improved physicochemical stability in the presence of said encapsulated pendimethalin.; The ZC formulation comprising pendimethalin encapsulated with a primer herbicide greatly improved the stability of the primer herbicide, which was otherwise susceptible to degradation in the environment of the other herbicides in the formulated product. The pendimethalin capsule suspension component used in the formulation is believed to contain a salting system that provides a suitable environment for the susceptible active ingredients. The stable, non-staining capsule suspension improved the shelf life of pendimethalin and reduced staining to a greater degree compared to commercially available pendimethalin formulations. The first herbicides of the present invention are those that are known to be susceptible to degradation or incompatible with pendimethalin, but which show remarkable effectiveness when stabilized in the ZC formulation of the present invention. Many sulfonylurea herbicides are known to be incompatible with other active compounds. Known WP formulations of sulfonylurea herbicides, such as pyrazosulfuron-ethyl with pendimethalin, are susceptible to degradation and loss of physicochemical properties, whereas the ZC formulation provides excellent active ingredient stability, as will be demonstrated in the examples below. The ZC product is stable and retains its physicochemical properties in thermal stability testing, freeze / thaw testing, and real-time storage. Thermal stability studies indicate a product's stability at higher temperatures and also provide an indication of its shelf life. Freeze-thaw stability indicates the product's ability to withstand cycles of low and ambient temperatures. Real-time storage at room temperature provides the product's shelf life. Therefore, in one embodiment, the first herbicide may be selected from, but is not limited to, classes of herbicides selected from sulfonylurea herbicides, triazinone herbicides, imidazolinone herbicides, triazine herbicides, anilide herbicides, quinolinecarboxylic acid herbicides, quinolinecarboxylic acid herbicides, benzoylcyclohexanedione herbicides, sulfonamide herbicides, benzofuranyl alkylsulfonate herbicides, organophosphate herbicides, chloroacetanilide herbicides, nitrophenyl ether herbicides, sulfonamide herbicides, amide herbicides or alkanamide herbicides and mixtures thereof. In one embodiment, the sulfonylurea herbicide may be selected from, but not limited to, amidosulfuron, azimsulfuron, bensulfuron or bensulfuron-methyl, chlorimuron, cyclosulfamuron, ethoxysulfuron, flazasulfuron, flucetosulfuron, flupirsulfuron, foramsulfuron, halosulfuron, mazosulfuron, mesosulfuron, metazosulfuron, methiopyrisulfuron, monosulfuron, nicosulfuron, orthosulfamuron, oxasulfuron, primisulfuron, propirisulfuron, pyrazosulfuron or pyrazosulfuron-ethyl, rimsulfuron, sulfometuron, sulfosulfuron, trifloxysulfuron, chlorsulfuron, cinosulfuron, etametsulfuron, iodosulfuron, iofensulfuron, metsulfuron or metsulfuron methyl, prosulfuron, tifensulfuron, triasulfuron, tribenuron, triflusulfuron, tritosulfuron. In another form, the sulfonylurea herbicide is pyrazosulfuron or an agrochemically acceptable derivative thereof such as pyrazosulfuron ethyl. In one form, the triazinone herbicide can be selected from, among others, ametridione, amibuzin, etiozine, hexazinone, isomethiozine, metamitron, metribuzin, or trifludimoxazine. In another form, the triazinone herbicide is metribuzin. In one form, the imidazolinone herbicide can be selected from among others, imazamethabenz, imazamox, imazapic, imazapir, imazaquin, imazethapir. In another form, the imidazolinone herbicide is imazapic. In yet another form, the imidazolinone herbicide is imazapic acid. In one embodiment, the triazine herbicide can be selected from, but not limited to, dipropetrin, trihydroxytriazine, atrazine, chloroazine, cyanazine, cypriazine, eglinazine, ipazine, mesoprazine, procyazine, proglinazine, propazine, sebutylazine, simazine, trietazine, terbuthylazine, indaziflam, triaziflam, atraton, methometon, prometon, secbumeton, simeton, terbumeton, ametrin, aziprothrin, cyanathrin, desmetran, dimehamethrin, metoprothrin, prometrin, simetrin, terbutrin. In one form, the triazine herbicide is atrazine. In one embodiment, the amide herbicide may be selected from, but not limited to, the group consisting of alidochlor, amicarbazone, beflubutamide, benzadox, benzipram, bromobutide, cafenstrol, CDEA, ciprazole, dimethenamid, dimethenamid-P, diphenamide, epronaz, etnipromide, fentrazamide, flucarbazone, flupoxam, fomesafene, halosaphen, huangcaoling, isocarbamide, isoxabene, napropamide, napropamide-M, petoxamide, propizamide, quinonamid, tebutam, thiafenacil. In one embodiment, the amide herbicide is preferably a herbicide selected from alkanamide, napropamide, or napropamide-M. In one embodiment, the herbicide anilide can be selected from, but not limited to, the group consisting of chloranocril, cisanilide, chlormeprop, cypromide, diflufenican, erlujixiancaoan, etobenzanide, fenasulam, flufenacet, flufenican, ipfencarbazone, mefenacet, mefluidide, metamifop, monalide, naproanilide, pentanochlor, picolinafene, propanil, sulfentrazone, triafamone. In one form, the herbicide anilide is diflufenican or flufenacet. eaoznn / zznz / B / Yii In one embodiment, the chloroacetanilide herbicide can be selected from, but is not limited to, acetochlor, alachlor, butachlor, butenachlor, delachlor, diethyl, dimehachlor, etachlor, etaprochlor, metazachlor, metolachlor, metolachlor-S, pretylachlor, propachlor, propisochlor, prinachlor, terbuchlor, tenylchlor, xylchlor. In one form, the chloroacetanilide herbicide is metolachlor or metolachlor-S. In one embodiment, quinolinecarboxylic acid herbicides can be selected from, but are not limited to, quinclorac, quinmerac. In one embodiment, benzoylcyclohexanedione herbicides can be selected from, but are not limited to, phenquinetrione, ketospiradox, mesotrione, sulcotrione, tefuryltrione, tembotrione. In one embodiment, benzofuranyl alkylsulfonate herbicides can be selected from, but are not limited to, benfuresates, etofumesate. In one embodiment, the dinitroaniline herbicide can be selected from, but is not limited to, benfluralin, butralin, chlornidine, dinitramine, dipropaline, etalfluralin, fluchloralin, isopropaline, metapropaline, nitraline, oryzalin, prodiamine, profluralin, trifluralin. In one embodiment, sulfonamide herbicides can be selected from, but are not limited to, asulam, carbasulam, fenasulam, oryzalin, penoxsulam, piroxsulam. In one form, the sulfonamide herbicide is oryzalin. In one embodiment, nitrophenyl ether herbicides can be selected from, but are not limited to, acifluorfen and its salts, aclonifen, bifenox, chloromethoxyfen, chlorotrofen, etnipromide, fluorodifen, fluoroglycofen, fluoronitrofen, fomesafen, fucaomi, furofloxifen, halosafen, lactofen, nitrofen, nitrofluorfen, oxyfluorfen. In one embodiment, organophosphate herbicides may be selected from, but not limited to, amiprofos-methyl, amiprofos, anilofos, bensulide, bilanafos, butamifos, clacifos, fosamine, glufosinate and its salts and esters, glufosinate-P, glyphosate and all its salts and esters, huangcaoling, piperophos, shuangjiaancaolin. In one form, the organophosphate herbicide is glufosinate or a salt or derivative thereof, and glyphosate or a salt or derivative thereof. Therefore, in a preferred embodiment, the first herbicide is selected from the group consisting of pyrazosulfuron-ethyl, metribuzin, imazapic acid, atrazine, napropamide, napropamide-M, flufenacet, oryzalin, glufosinate, glyphosate, and agrochemically acceptable salts and derivatives thereof. Therefore, in this embodiment, the present invention provides a ZC composition comprising: (a) microencapsulated pendimethalin; and (b) suspension concentrate of a co-herbicide selected from the group consisting of pyrazosulfuron-ethyl, metribuzin, imazapic acid, atrazine, napropamide, napropamideM, flufenacet, oryzalin, glufosinate, glyphosate and agrochemically acceptable salts thereof. In this embodiment, the present invention provides a suspension comprising particles of a first herbicide selected from the group consisting of pyrazosulfuron-ethyl, metribuzin, imazapic acid, atrazine, napropamide, napropamide-M, flufenacet, oryzalin, glufosinate, glyphosate, and agrochemically acceptable salts thereof, combined with a suspension of pendimethalin microcapsules in an aqueous phase. The microcapsules comprise a herbicidally effective amount of pendimethalin encapsulated within a polyurea polymer wall, the polyurea polymer wall constituting approximately 1% to approximately 20% by weight of the suspension. The aqueous phase comprises at least one alkali or alkaline earth metal salt of an organic acid selected from the group consisting of acetic acid, propionic acid, citric acid, fumaric acid, tartaric acid, oxalic acid, succinic acid, valeric acid, malonic acid, and other organic acids. glutaric acid,adipic acid and italic acid, wherein said at least one alkali or alkaline earth metal salt of an organic acid is present in an amount ranging from approximately 2% to approximately 55% by weight of the suspension; and wherein said first herbicide exhibits improved physicochemical stability in the presence of said encapsulated pendimethalin. In another embodiment, the present invention provides a ZC formulation comprising: a suspension concentrate comprising particles of a first herbicide selected from the group consisting of pyrazosulfuron-ethyl, metribuzin, imazapic acid, atrazine, napropamide, napropamide-M, flufenacet, oryzaline, glufosinate, glyphosate and agrochemically acceptable salts thereof. combined with a suspension of pendimethalin microcapsules in an aqueous phase, said microcapsules comprising a herbicidally effective amount of pendimethalin encapsulated within a polyurea polymer wall, said polyurea polymer wall constituting approximately 1% to approximately 20% by total weight of the suspension, said aqueous phase comprising at least one alkali or alkaline earth metal salt of an organic acid selected from the group consisting of acetic acid, propionic acid, citric acid, fumaric acid, tartaric acid, oxalic acid, succinic acid, valeric acid, malonic acid, glutaric acid, adipic acid, and italic acid, wherein said at least one alkali or alkaline earth metal salt of an organic acid is present in an amount ranging from approximately ροοζηη / ζζηζ / Β / γι 2% to approximately 55% by weight of the suspension; and wherein said first herbicide shows improved physicochemical stability in the presence of said encapsulated pendimethalin. In one embodiment, the encapsulated pendimethalin component may comprise another herbicide that is different from the first herbicide. This additional herbicide can typically be co-encapsulated with pendimethalin within the microcapsules. The choice of this additional herbicide is not particularly limiting and can be any herbicide that is compatible with pendimethalin. The ZC formulations according to the present invention are prepared in such a way that the microencapsulation of pendimethalin is carried out first and the resulting microcapsule dispersion, if appropriate after partial or complete removal of the liquid phase, is mixed with a suspension of the first herbicide. In the formulation where the first herbicide is a liquid, it is typically absorbed / adsorbed onto solid carrier particles. These solid carrier particles, which have the liquid herbicide absorbed / adsorbed onto them, are then used conventionally to prepare a suspension that will be combined with encapsulated pendimethalin. In one aspect, the pendimethalin capsule suspension can be prepared by encapsulating pendimethalin within a polymer wall, said polymer wall being formed in situ by an interfacial polymerization reaction occurring between a first phase dispersed in a second phase, at least one of said first and second phases being characterized by comprising a predefined amount of at least one alkali or alkaline earth metal salt of an organic acid. The suspension concentrate of the present invention can be prepared by mixing surfactants, co-formulants, water, and the first herbicide. The capsule suspension comprising pendimethalin can be prepared by a process as described in the aforementioned origin applications. The process includes: (a) form an aqueous solution comprising at least one surfactant and a predefined amount of at least one alkali or alkaline earth metal salt of an organic acid; (b) forming an organic phase by melting a herbicidally effective amount of pendimethalin active ingredient and adding a predetermined amount of a first wall-forming component to said organic phase; (c) dispersing said organic phase in said aqueous solution to obtain an emulsion; and (d) adding a second wall-forming component to said emulsion such that said second wall-forming component reacts with said first wall-forming component contained within said emulsion to the polymer wall encapsulating at least said herbicidally effective amount of the active ingredient pendimethalin. The suspension concentrate comprising the first herbicides selected according to the present invention can be prepared as follows: (a) forming a suspension comprising water, surfactants and additional co-formulants with the first herbicide or mixtures thereof; and (b) grinding the suspension to a desired particle size at room temperature. The microcapsules and suspension concentrate can be mixed to form a stable ZC formulation. In alternative embodiments, the polymer wall of the capsule of the present invention may be any known shell wall material, but is preferably selected from polyurea, polyurethane, polyamide, polycarbonate, polysulfonamide shell wall, or crosslinked or non-crosslinked combinations thereof. Preferably, the polymer wall of the capsule is a polyurea wall. The polymer wall of the capsule of the present invention is formed using interfacial polymerization by bringing said first wall-forming component into contact with a second wall-forming component as conventionally known in the art. The first wall-forming component is preferably selected from a polyisocyanate, a polyacid chloride, a polychloroformate, and a polysulfonyl chloride. The second wall-forming component is preferably selected from a polyamine and a polyol. Preferably, a polyisocyanate reacts with a polyamine to form a polyurea capsule wall of the present invention. Preferred polyisocyanates as the first wall-forming component may be selected from tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, toluene diisocyanate, diphenylmethane-4,4'-diisocyanate, polymethylene polyphenylene isocyanate, 2,4,4'-diphenyl ether triisocyanate, 3,3'-dimethyl-4,4'-diphenyl diisocyanate, 3,3'-dimethoxy-4,4'-diphenyl diisocyanate, 1,5-naphthylene diisocyanate, and triphenylmethane 4,4',4-triisocyanate. A preferred first polyisocyanate wall-forming component is polymethylene polyphenylisocyanate. The preferred polyamines as the second wall-forming components can be selected from ethylenediamine, propylene-1,3-diamine, tetramethylenediamine, pentamethylenediamine, 1,6-hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, pentaethylenehexamine, 4,9-dioxadodecane-1, 1,2-diamine, 1,3-phenylenediamine, 2,4- and 2,6-toluenediamine, and 4,4'-diaminodiphenylmethane or an acid addition salt thereof. The preferred polyamine according to the present invention is diethylenetriamine. The first wall-forming component comprises approximately 0.1% to approximately 20% by weight of the organic phase of the present invention. The second wall-forming component is preferably present in an amount of approximately 0.3% to 7.5% by weight relative to the total weight of the formulation. In a further preferred embodiment, the preferred polyurea polymer shell wall can be formed by a self-condensation reaction of a polyisocyanate wall-forming component. In this embodiment, the process for preparing the capsule suspension formulation according to the present invention comprises establishing a physical dispersion of an organic phase in the aqueous phase. In this embodiment, the organic phase comprises the organic isocyanate intermediate as described above, together with the active ingredient pendimethalin. In one embodiment, the surfactants can be selected from ethylene oxide / propylene oxide condensates; alkyl, aryl- and aryl, arylethoxylates and derivatives thereof; lignosulfonates; cresol- and naphthalene-formaldehyde sulfonates and condensates; polycarboxylates and derivatives thereof; and mixtures thereof. In one embodiment, the co-formulants can be selected from antifoaming agents, antifreeze agents, suspending agents, preservatives, and thickening agents. In one embodiment, the antifoaming agents can be selected from silicone emulsions such as SAG-1572, long-chain alcohols, fatty acids, organofluorinated compounds, and mixtures thereof. In one embodiment, the suspension comprising the first herbicide, from which its suspension concentrate is prepared, can be ground to a particle size of 8-10 microns. Therefore, in another aspect, the present invention provides a process for the preparation of a ZC formulation, said process comprising: (a) form an aqueous solution comprising at least one surfactant and a predefined amount of at least one alkali or alkaline earth metal salt of an organic acid; (b) forming an organic phase by melting a herbicidally effective amount of pendimethalin active ingredient and adding a predetermined amount of polyisocyanate wall-forming component; (c) dispersing said organic phase in said aqueous solution to obtain an emulsion to form an interface between the discrete organic phase droplets and the aqueous phase; and (d) maintaining said emulsion for a period of time sufficient to allow substantial completion of the polyisocyanate self-polymerization reaction so that said liquid droplets in the organic phase become capsules comprising polyurea shells enclosing pendimethalin active ingredient; (e) forming a suspension comprising dispersant, water, surfactants and co-formulants to obtain a suspension and adding the first herbicide to the suspension; (f) grind the suspension to a desired particle size and mix the resulting dispersion with the capsule suspension dispersion or mix the drained microcapsules with the suspension; and (g) combine the microencapsulated portion of the formulation with the suspension. In one embodiment, the emulsion of said organic phase in said aqueous solution can preferably be heated to a temperature between 20°C and approximately 100°C, preferably to approximately 35-850°C to accelerate the self-condensation of the polyisocyanate prepolymer. However, regardless of whether self-condensation of the first wall-forming component is preferred or condensation between a first and a second wall-forming component is preferred, the relative amounts of the organic and aqueous phases are not critical to the process of the present invention. Typically, the organic phase may comprise up to approximately 75% by volume of the total emulsion, and the emulsion comprises specific droplets of an organic solution dispersed in the aqueous solution. The droplet size in the emulsion was not found to be critical for the formulation and procedure of the present invention, but it can range from 0.5 microns to approximately 4000 microns, which can be further adjusted using a high-shear device, preferably from approximately 1 micron to approximately 100 microns. It has also been found that the in-situ self-condensation polymerization reaction is self-limiting and is generally allowed to run its course. The reaction is usually run to completion within a few minutes to a few hours. In a preferred embodiment, the reaction is typically allowed to proceed for approximately 2 to 3 hours. However, the preferred polyurea polymeric shell can be formed by a self-condensation reaction of a preferred polyisocyanate using other preferred methods. In one such preferred embodiment, the formation of the polyurea capsule enclosure around the dispersed organic droplets could be brought about by (a) dispersing the organic phase droplets in the continuous aqueous phase to form an emulsion followed by heating the resulting emulsion; or (b) heating the continuous aqueous phase and dispersing the organic phase droplets in the heated continuous aqueous phase to form the emulsion, thereby obtaining the desired self-condensation reaction at the interface between the organic droplets and the aqueous phase. The alkali or alkaline earth metal salt of an organic acid as used in this document is preferably selected from the alkali or alkaline earth metal salt of a weak organic acid selected from acetic acid, propionic acid, citric acid, fumaric acid, tartaric acid, oxalic acid, succinic acid, valeric acid, malonic acid, glutaric acid, adipic acid, and italic acid. The preferred alkali metal is selected from sodium and potassium. In a more preferred embodiment, the alkali metal is sodium. In another preferred embodiment, the alkali or alkaline earth metal salt of an organic acid is selected from sodium acetate or disodium succinate. The aqueous solution comprises at least one surfactant. Preferably, the surfactant can be selected from the group comprising ethoxylated lignosulfonic acid salts, lignosulfonic acid salts, oxidized lignins, lignin salts, styrene-maleic anhydride copolymer salts, polyvinyl alcohol, styrene-maleic anhydride copolymer partial ester salts, polyacrylic acid partial salts, and polyacrylic acid terpolymer partial salts. Preferably, the surfactant is calcium or sodium lignosulfonate. Preferably, the surfactant is present in the amount of approximately 0.2% to approximately 5% by weight of the formulation. The aqueous solution of the present invention includes an alkali or alkaline earth metal salt of an organic acid or mixtures thereof in an amount of approximately 2% to approximately 55% by weight of the formulation. The term effective amount of pendimethalin herbicide or the first herbicide (hereafter referred to as the co-herbicide) is the amount of pendimethalin or the co-herbicide, respectively, that, when applied at that rate, will provide the required weed control. The specific amount depends on many factors, including, for example, the crop, the weeds to be controlled, and environmental conditions. However, selecting the appropriate amount of active agent to apply is within the expertise of a skilled technician and is not considered particularly limiting. The microcapsules of the present invention comprise from approximately 5% to approximately 60% pendimethalin. The suspension concentrate of the present invention comprises from 5% to approximately 60% of the co-herbicide. In a preferred embodiment, the polymeric shell wall according to the present invention constitutes from approximately 1% to approximately 20% by weight of the formulation. In another preferred embodiment, the polymeric shell wall constitutes approximately 2.5% by total weight of the formulation. The microcapsules of the present invention preferably have a particle size of approximately 2 microns to 50 microns. In one modality, the suspension can be ground to a particle size of 8-10 microns. Preferably, the formulation of the present invention comprises an amount of antifoam from approximately 0.01% to approximately 5% by weight of the formulation. Such suitable antifoams are conventionally known in the art and are not particularly limiting. Preferably, the formulation of the present invention comprises surfactants in the form of lignosulfonate salts, more preferably sodium or calcium salts. The microcapsules of the present invention may further include a rheology modifier. The preferred rheology modifier includes xanthan gum and clay, which may be present in an amount of approximately 0.01% to approximately 3% by weight of the formulation. The capsule suspension formulation according to the present invention can be further neutralized with an organic acid to regulate the pH within the desired range. Accordingly, the formulations according to the present invention further comprise from approximately 0.1% to approximately 10% of a neutralizing acid, which may be an organic acid. Preferably, the neutralizing acid is acetic acid. Another advantage of adding a neutralizing acid is that the added acid combines with unreacted amines to form an ammonium salt, which substantially reduces the amount of external salt required to achieve appreciable non-staining properties. Adding a neutralizing acid is particularly beneficial for reducing the inorganic salt content of prior art formulations, which has been reported to exacerbate phytotoxicity problems in several test plants. In this embodiment of the present invention, a significantly large amount of excess amines can be used to further reduce the external addition of a salt by generating a greater quantity of salt in situ upon reaction with the neutralizing acid. In a preferred embodiment, the formulations according to the present invention may further comprise a biocide in an amount of approximately 0.01% to approximately 3% by weight of the formulation. In one aspect, the present invention provides a ZC composition comprising encapsulated pendimethalin and a co-herbicide selected from the group consisting of pyrazosulfuron-ethyl, metribuzin, imazapic acid, atrazine, napropamide, napropamide-M, flufenacet, oryzalin, glufosinate, glyphosate and agrochemically acceptable salts and derivatives thereof, in a suspension concentrate. In one aspect, the present invention provides a ZC composition comprising encapsulated pendimethalin and a suspension concentrate comprising at least two co-herbicides, at least one of the co-herbicides being selected from the group consisting of pyrazosulfuron-ethyl, metribuzin, imazapic acid, atrazine, napropamide, napropamide-M, flufenacet, oryzalin, glufosinate, glyphosate and agrochemically acceptable salts and derivatives thereof. In another aspect, the present invention also provides a process for the preparation of a ZC formulation, said process comprising: (a) forming an aqueous solution comprising at least one surfactant and a predefined amount of at least one alkali or alkaline earth metal salt of an organic acid and optionally heating said aqueous solution; (b) forming an organic phase by melting a herbicidally effective amount of pendimethalin active ingredient and adding a predetermined amount of a first wall-forming component to said organic phase; (c) dispersing said organic phase in said aqueous solution to obtain an emulsion and optionally heating said emulsion formed; (d) adding a second wall-forming component to said emulsion such that said second wall-forming component reacts with said first wall-forming component contained within said emulsion to the polymer wall encapsulating at least said herbicidally effective amount of the active ingredient pendimethalin. (e) form a suspension comprising water, at least one co-herbicide, surfactants and co-formulants; (f) grind the suspension to a desired particle size to form a stable co-herbicide suspension; (g) combine the microencapsulated part (d) of the formulation with the suspension. Preferably, the step of forming an aqueous solution comprises heating water to an elevated temperature, preferably approximately 60°C, and adding the surfactant and the alkali or alkaline earth salt of an organic acid. In a preferred embodiment, an antifoaming agent is also added to the aqueous solution. In another preferred embodiment, said first wall-forming component is preferably added to said molten pendimethalin while stirring. In yet another preferable embodiment, said step of dispersing said organic phase in said aqueous solution to obtain an emulsion is carried out with a desired particle size. In another preferred embodiment, after the addition of the second wall-forming component to the emulsion, the reaction is allowed to continue for a predetermined time, preferably one hour under stirring, while the reaction mass is kept at an elevated temperature. The reaction mixture is then neutralized with an organic acid. Neutralization is preferably carried out to achieve a formulation pH of approximately 6.5 to approximately 7.5. Subsequently, xanthan gum is preferably added under stirring. In a preferred embodiment, a biocide is added to obtain the target formulation. In another preferred embodiment, the process of the present invention is carried out at an elevated temperature to maintain the pendimethalin active ingredient in a molten state and to improve the rate of polymer wall formation. In this embodiment, the process of the present invention is preferably carried out at a temperature of approximately 35°C to approximately 85°C and more preferably at a temperature of approximately 50°C to 65°C. Therefore, in one embodiment the present invention also provides a process for preparing a capsule suspension formulation, said process comprising: (a) forming an aqueous solution comprising at least one surfactant and a predefined amount of at least one alkali or alkaline earth metal salt of an organic acid and optionally heating said aqueous solution; (b) forming an organic phase by melting a herbicidally effective amount of pendimethalin active ingredient and an additional herbicide and adding a predetermined amount of a first wall component to said organic phase; (c) dispersing said organic phase in said aqueous solution to obtain an emulsion and optionally heating said emulsion formed; and (d) adding a second wall-forming component to said emulsion such that said second wall-forming component reacts with said first wall-forming component comprised within said emulsion to the polymer wall encapsulating at least said herbicidally effective amount of the active ingredient pendimethalin and any additional herbicide; (e) form a suspension comprising water, at least one co-herbicide, surfactants and co-formulants; ροοζηη / ζζηζ / Β / γι (f) grind the suspension to a desired particle size to form a stable co-herbicide suspension; (g) combine the microencapsulated part (d) of the formulation with the suspension. In one embodiment, the ZC formulation of the present invention comprises a mixture of the pendimethalin component and the co-herbicide suspension component in a predetermined ratio. In one embodiment, the pendimethalin component and the co-herbicide component are mixed in a ratio of approximately 1:90 to approximately 90:1, preferably in a ratio of approximately 1:10 to approximately 10:1. In another non-limiting embodiment, the pendimethalin component and the coherbicide component are mixed in a ratio of approximately 1:2 to approximately 1:3. The invention further relates to a method for controlling weeds in a location by applying to the weeds in the location a herbicidally effective amount of a ZC formulation comprising microencapsulated pendimethalin and a co-herbicide. Preferably, the present invention provides a method for controlling undesirable plant species comprising applying to the foliage of plants or to soil or water containing seeds or other propagation organs thereof, a herbicidally effective amount of a ZC formulation comprising microencapsulated pendimethalin and a co-herbicide present in a suspension concentrate. Alternatively, the present invention provides a method for controlling undesirable plant species comprising applying to the foliage of the plants or to the soil or water containing seeds or other propagating organs thereof, a herbicidally effective amount of a ZC formulation comprising pendimethalin, co-encapsulated with an additional herbicide and the first herbicide present as a suspension concentrate of said formulation. In one embodiment, the composition of the present invention can be packaged as a kit of parts. In one embodiment, a kit of parts can contain several components of the formulation of the present invention that can be combined according to the instructions before spraying. Accordingly, one aspect of the present invention may provide a multi-pack herbicide product for weed control comprising components of the present invention and a manual. The instruction manual includes instructions for administering the ZC formulation components. In one modality, the instruction manual includes instructions for administering the ZC formulation in a location or on the foliage of plants or in the soil or water containing seeds or other plant propagation organs. ροοζηη / ζζηζ / Β / γι In another embodiment, the instruction manual includes instructions for mixing the encapsulated pendimethalin component with the first herbicide suspension concentrate component in a predetermined ratio. In one embodiment, the instruction manual instructs the user to mix the pendimethalin component and the first herbicide component in a ratio of approximately 1:10 to approximately 10:1, preferably in a ratio of approximately 1:2 to 1:3. In one version, the combination kit is packaged in a carton or box. In another version, the instruction manual may be printed on the carton or box, or it may be printed in a leaflet that is included inside the carton or box. The herbicide composition and method of the present invention may offer some particular advantages over compositions known in the prior art. The novel combination of microencapsulated pendimethalin and the first herbicide in a ZC formulation allows for stable formulations that provide broad-spectrum weed coverage. ZC formulations greatly improve stability and allow for the combination of incompatible active ingredients. The novel ZC formulation also has the advantage of being a non-staining pendimethalin composition. The invention will now be described with reference to the following specific examples. It should be noted that the examples below illustrate rather than limit the invention, and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the present invention. pooznn / zznz / B / Yii EXAMPLES: Example 1: ZC formulation pendimethalin sulfonylurea A) Composition of pendimethalin capsule suspension: No. of Series ingredients % w / w 1 Pendimethalin technical 40 @ 97% purity technology 40.41 2 PMPt 1.01 3 Water 3821 4 Borresperse Na 2.50 5 Sodium acetate (an) 15.30 6 Defoamer 0.10 7 AGE 0.23 8 DETA 0.26 9 Acetic acid 0.35 10 2% Rhodopol-23 gel 1.50 11 Proxel GXL 0.13 12 Tota! 100.00 ροοζηη / ζζηζ / Ε / γΐΛ The above composition was prepared following the encapsulation process as follows: An aqueous solution was prepared by heating water to 60°C while adding sodium lignosulfonate and then sodium acetate, followed by an antifoaming agent, while stirring. A sufficient quantity of water was reserved separately for the amine and gum preparations. Meanwhile, the organic phase was formed by melting technical-grade pendimethalin, heating it to 60°C, and then adding polymethyl polyphenylisocyanate (PMPI) while stirring. Both the aqueous and organic phases were maintained at 60°C throughout the reaction. The organic phase was emulsified in the aqueous solution to the desired particle size. DETA / EDA was added to the resulting emulsion. The reaction was allowed to continue for 1 hour at 60°C with stirring. The reaction mixture was allowed to cool to room temperature for 15 minutes before being neutralized with acetic acid. The formulation was neutralized to pH 8.0 under cool conditions or to pH 7 under warmer conditions.The neutralized formulation was filtered through a 60-mesh sieve. A xanthan gum-water suspension was prepared separately and added to the previous formulation under stirring for at least 15 minutes. Finally, a biocide was added, and the final product was filtered through a 60-mesh sieve. Particle size was measured using a Horiba LA-910 or CILAS 1064. Sulfonylurea suspension concentrate Serial No. Formulation Component Pyrazosulfuron ethyl Bensulfuron methyl Sulfosulfon 1 Suifontlurea 51 @ 98% purity technology 52.04 52.04 52.04 2 Borresperse NA 06.00 06.00 06.00 3 Antifoam (SAG-1572) 00.10 00.10 00.10 4 Water (QS) 41.86 41.86 41.86 Total 100.00 100.00 100.00 The above composition was prepared following the process below: An aqueous solution was prepared using water, sodium lignosulfonate, and an antifoaming agent. Sulfonylurea herbicide was added to the mixture and homogenized. The homogenized solution was ground to a particle size of 8–10 microns in a grain mill to form a suspension. Microencapsulated pendimethalin was added to the sulfonylurea suspension concentrate to form the final ZC formulation. The resulting formulation was then subjected to stability testing. Example 2: Physicochemical data pendimethalin + sulfonylurea ZC: pooznn / zznz / B / Yi Serte's Nü. Properties Pendimethalin content At 14 days of AHS at 54°C At 14 days of AHS at 54°C At 14 days of AHS at 54°C 1 Appearance Suspension of yellow-orange colored capsules Suspension of orange-colored capsules Suspension of yellow-orange colored capsules Suspension of yellow-orange colored capsules Suspension of yellow-orange colored capsules Suspension of yellow-orange colored capsules Suspension of yellow-orange colored capsules Suspension of yellow-orange colored capsules 2 Pendimethalin content 458.5 457.2 452.01 450.60 459.38 457.38 3 SU content g / L 11.7 11.36 (2.9% degradation) 27.53 26.99 (1.96% degradation) 33.43 32.67 (2.27% degradation)} 4 Susp&nsibility % w / w 10S 26 109.9 98.67 98.28 9910 853.63 5 Spontaneity of dispersion % w / w 100.15 160.29 99.14 98.98 39.26 99.14 6 Wet sieve retention % ρφ 0.02 6.62 0.95 0.12 0.03 0.09 pH 1% aqueous 7.43 7.36 7.52 7.69 7.85 7.86 8 % Rinse residues from the discharge capacity 0.1 8.12 0.06 0.11 0.5 0.W 9 Particle size. D-50 5.58 5.57 5.36 5.57 5.29 5.50 D-4,3 6.59 5.72 6.61 6.63 6.53 6.62 OSO 13.28 13.32 14.10 14 17 13.26 13.69. Conclusion: 1) The three formulations showed good stability of the physicochemical properties, suspensibility, spontaneity of dispersion, pH range, wet sieve retention, particle size in AHS at 54°C. 2) All three formulations showed improved stability of the active ingredient in AHS. ροοζηη / ζζηζ / Β / γι Example 3: Low-temperature stability of pendimethalin + PSE ZC Serial No. Properties Before the freeze / thaw test After the freeze / thaw test 1 Appearance Bitter orange colored capsule suspension Bitter orange colored capsule suspension □i. Pendimel content 458.5 458.3 3 Pyrazoculfuron content g / L 11.7 11 65 4 Free content % w / w 0.13 0.6 5 Suspensibility % w / w 98.3 98.56 6 Wet sieve retention % w / w 0.02 0.03 pH 1.3 / aqueous 7.43 7.35 8 Particle size D-5 5.58 5.59 D-4.3 6.53 6.61 D-5 13.28 13.48 Conclusions: The free pendimethalin content in the formulation was very low, and both the stability of the capsule and the stability of the suspension at low temperature were excellent. Example 4: Real-time stability data for pendimethalin + pyrazosulfuron ethyl ZC ροοζηη / ζζηζ / Β / γι Sequence No. Properties Day Zero Month 6 Month 12 1 Appearance Suspension of orange-colored capsules Smooth suspension of orange-colored capsules Smooth suspension of orange-colored capsules 2 Pendimethalin ai content g / L 451.6 450.04 449.90 3 Pyrazosylfuran ai content g / L 1146 1122 (2.09% degradation) 11.15 (2.7% degradation) 4 Suspensivity % w / w 99.52 99.0 98.5 5 Spontaneous Dispersion % w / w 106.93 100.5 99.85 6 Wet Sieve Retention % w / w 0.04 0.04 0.04 7 pH as 7 33 7.30 7.45 9 Particle size D-50 6.17 6.15 6.16 D-4.3 9.78 9.76 9.8® D-90 20.59 21.2 211 Conclusion: The formulation was stable over a period of 12 months. Pyrazosulfuron ethyl and pendimethalin showed very little degradation. Example 5: Preparation of the pendimethalin + triazinone ZC composition: The pendimethalin capsule suspension was prepared as described in Example 1. The metribuzin suspension concentrate was prepared according to the following formulation: pooznn / zznz / E / YiAi Serial No. Formulation Component % 1 Nitribyzin 52 technical @ 95% laziness technology .54.74 2 Bosresperse Na 7.50 4 Foaming Agent 0.10 6 Water 37.66 Total 1000 The above composition was prepared using the following process: An aqueous solution was prepared using water, sodium lignosulfonate, and an antifoaming agent. Metribuzin was added to the mixture and homogenized. The homogenized solution was ground to a particle size of 8–10 µm in a bead mill to form a suspension. Microencapsulated pendimethalin was added to the metribuzin suspension concentrate to form the final ZC formulation. The resulting formulation was then subjected to stability testing. Example 6: Physicochemical data of pendimethalin + metribuzin ZC Serial No. Properties Environment 14 days in AHS at 54°C 1 Appearance Orange-colored capsule suspension Orange-yellow colored fluid suspension 2 Pendimethalin content 339.31 383.0 3 Metribuzin content 8.07 57.72 4 Suspensibility % w / w 104.3 102.31 5 Spontaneous dispersion (ΡΦ) 1053 103.26 6 Wet sieve retention % ΡΦ 0.02 0.03 and pH 7.15 7.29 8 % Rinse residue and pouring rate 0.05 0.05 9 Particle size D-50 7.38 7.58 D-4.3 10.0 10.2 □-90 14.9 18.50 Conclusion: 1) The formulation demonstrated good stability of the physical-chemical properties such as suspensibility, spontaneity of dispersion, pH range, wet sieve retention, particle size in AHS at 54°C. 2) The formulation showed improved Al stability in AHS. Example 6: Low temperature stability of pendimethalin + metribuzin ZC eooznn / zznz / E / Yii Sequence No. Properties Before freezing / thawing test After freezing / thawing test 1 Appearance Orange-yellow colored capsule suspension Orange-yellow colored fluid suspension 2 Pendimethalin acetic acid content g / L 389.31 389.19 3 Mekibuzin acetic acid content g / L 65.07 67.95 4 Suspension % w / w 104.3 103.6 5 Wet sieve retention w / w SD2 9.03 5 pH as dry 7.15 7.21 7 Packet size 0-50 7.38 7.41 D-4 10.0 10.1 d-4 149 15.1 Conclusions: Free pendimethalin in the formulation was very low and both the stability of the capsule and the stability of the suspension at low temperature were excellent. Example 7: Real-time stability data for pendimethalin + metribuzin ZC No. Series Properties Day Zero Month 6 Month 12 1 Appearance Orange-yellow capsicum suspension Orange-yellow liquid capsule suspension Orange-yellow liquid capsule suspension 2 Pendimethalin content g / L 389.31 388.72 388.14 3 Mettibuzin content 68.07 66.78 66.43 4 Suspensibility % w / w 104.3 99.68 99 5 Spontaneity of dispersion % w / w 105.3 100.12 101.0 6 Wet sieve retention % w / w 0.2 0.02 0.02 7 pH of aqueous dispersion 7.15 6.91 6.80 9 Particle size. D-50 7.38 6.05 5.03 D-4.3 10.0 8.8 3.64 D-SO 14.3 15.8 17 9 Conclusion: 1) The formulation demonstrated good stability of the physicochemical properties such as suspensibility, spontaneity of dispersion, pH range, wet sieve retention, particle size, etc., in AHS at 54 °C and in real-time storage for a period of 12 months. 2) Both pendimethalin and metribuzin showed good stability in AHS and real-time storage. Example 8: Pendimethalin + triazine herbicide combination The pendimethalin capsule suspension was prepared as described in Example 1. The atrazine suspension concentrate was prepared according to the following formulation: pooznn / zznz / E / YiAi Serial Number Formulation Component % 1 PemphimethaSna 18.1% @ 40% purity CS 45.25 2 Atrazine 18.1% @ 50% suspension purity 36.2 3 2% of gei RhodspsF23 2.50 4 R 100M 2.00 5 Proxy gxl 0.10 6 Water 13.95 Total 100 00 The above composition was prepared using the following process: An aqueous solution was prepared using water, sodium lignosulfonate, and an antifoaming agent. Atrazine was added to the mixture and homogenized. The homogenized solution was ground to a particle size of 8–10 microns in a grain mill to form a slurry. Microencapsulated pendimethalin was added to the atrazine suspension concentrate to form the final ZC formulation. The resulting formulation was subjected to stability testing: Example 9: Physicochemical data of pendimethalin + atrazine ZC Serial No. Properties Environment - 14 days in AHS Appearance Orange-yellow capsule suspension Orange-yellow fluid capsule suspension 2 Anti-metafea content g / L 205.99 255.88 3 Atrazine content g / L 205.56 4 Suspensivity % w / w 103 91 152.69 5 Spontaneous dispersion % w / w 105.83 150.11 6 Wet sieve retention % w / w 0.01 9.53 7 pH 7.31 7.48 8 % rinse residue. Pouring capacity 0 03 5.08 9 Particle size D-50 3.75 3.42 D-4r3 6.67 § 07 D-90 14.4 13.6 Conclusion of the ZC formulation of pendimethalin with atrazine: 1) The formulation demonstrated good stability of physicochemical properties such as suspensibility, spontaneity of dispersion, pH range, wet sieve retention, particle size, etc., in AHS at 54°C and in real-time storage. 2) The formulation demonstrated excellent stability in AHS. Example 10: Low temperature stability: pooznn / zznz / E / YiAi No. of Six Properties Prior to r^geiadóaretesrxmgetaaón pass After freezing / thawing test 1 Appearance Orange rite cote aine capsule suspension Wta suspension of orange-yellow capsules 2 Pendimethalin ai content g / L 205.99 206.27 3 Atrazine ai content g.fL 205.69 2G6.50 4 Saspeasibility % w / w 103.91 101.73 5 Sieve retention w / w 0.D1 0.05 6 p H as tai 7.31 7.42 í Particle size. D-S0 3.75 341 0-43 6.67 6.62 0-90 14.4 14.3 Conclusion: The formulation was found to be stable in the freeze / thaw cycle and maintained its physicochemical properties as an environmental sample. Example 11: ZC formulation pendimethalin + alkanamide herbicide The pendimethalin capsule suspension was prepared as described in Example 1. The D-napropamide suspension concentrate was prepared according to the following formulation: Series Na Formulation Component % 1 D-napraparasda 52 % @ 98 53.06 2 Borresperse NA. 7.00 3 Foaming Agent (SAS-1572} 0.50 4 Agoa{QS) 39.44 Total 100.00 The above composition was prepared using the following process: An aqueous solution was prepared using water, pendimethalin capsule suspension, sodium lignosulfonate, and an antifoaming agent. D-napropamide was added to the mixture and homogenized. The homogenized solution was ground to a particle size of 8–10 microns in a grain mill to form a suspension. Microencapsulated pendimethalin was added to the D-napropamide suspension concentrate to form the final ZC formulation. The resulting formulation was then subjected to stability testing. Example 12: Physicochemical data of pendimethalin + metribuzin ZC ροοζηη / ζζηζ / Β / γι Serial No. Properties Environment 14 days in AHS 1 Appearance Orange-yellow capsule suspension Orange-yellow fluid capsule suspension 2 Pendimethalin ai content g / L 241.01 240.8 3 Dnapropamide ai content g / L 221.2 221.0 4 Suspensibility % w / w 98.3 99.0 5 Spontaneous dispersion % w / w 99.5% 100.2 6 Sieve retention, w / w 0.04 0.85 7 % Aqueous suspension 7.5% 7.58 % Rinse residue from pouring capacity 0.18 0 21 8 Particle size D-50 4.35 4.16 0-4.3 8.54 8.32 D-90 14.5 14.7 Conclusion of the ZC formulation of pendimethalin with D-napropamide: 1) The formulation demonstrated good stability of physicochemical properties such as suspensibility, spontaneity of dispersion, pH range, wet sieve retention, particle size, etc., in AHS at 54°C and in real-time storage. 2) Both pendimethalin and D-napropamide demonstrated excellent stability in AHS. Example 13: Low temperature stability of pendimethalin + D-napropamide eaoznn / zznz / B / Yii Sene No. Properties Before the freezing / thawing test After the freezing / thawing test 1 Appearance Suspension of orange-yellow capsules Suspension of bitter orange-colored capsules 2 Pendimethalin ai content g / L 241.01 240.92 3 Napropamide ai content g / L 221.2 221.45 4 Suspension Weight % 98.3 33.96 5 Wet sieve retention % 0.06 6 pH as dry 7.35 7.43 7 Particle size D-50 4.35 4.26 D-4.3 3.54 8.45 D-90 1.45 1.45 Conclusions: The formulation was found to be stable in the freeze / thaw cycle and maintained its physicochemical properties as an environmental sample. Example 14: ZC formulations pendimethalin + imidazolinone herbicide The pendimethalin capsule suspension was prepared as described in Example 1. The imidazolinone herbicides imazapic and imazatapir were formulated as concentrated suspensions according to the following formulation: Serial No. Formulation Component Imazatapyr Acid Imazatapyr Acid 1 Imidazine 96% purity 46.4 52.03 2 Borosperm N / A 7.0C < 7.00 3 Antifoam (SAG-1572) Q 50 0.50 4 Aggregate (GS) 46.1 40.42 Total 100.00 100.00 The above composition was prepared using the following process: An aqueous solution was prepared using water, pendimethalin capsule suspension, sodium lignosulfonate, and an antifoaming agent. Imidazolinone was added to the mixture and homogenized to obtain the final ZC formulation. Example 15: ZC formulation pendimethalin + imazapic acid: The pendimethalin capsule suspension was prepared as described in Example 1. The imazapic was formulated as a suspension concentrate according to the following formulation ροοζηη / ζζηζ / Β / γι Serial No. Component of Formufedon % 1 PencSmatafina 31.3 @ 40.7 % purity CS 70.00 2 Imazapic acids B.5@ 45 % purity of suspension 1S.S8 3 2.00 4 2% gel RhGdopoF231 1.00 5 Proxei GXL 0.10 6 Water (QS} 1.12 Total 100.00 The above composition was prepared using the following process: An aqueous solution was prepared using water, pendimethalin capsule suspension, sodium lignosulfonate, xanthan gum, and a biocide. The mixture was homogenized. Imazapic was added to the mixture and homogenized to obtain the final ZC formulation. The formulation was found to be stable at room temperature. Example 16: ZC formulation pendimethalin + organophosphate herbicide The pendimethalin capsule suspension was prepared as described in Example 1. The glyphosate suspension concentrate was prepared according to the following formulation: Serial No. Formulation Component % w' p G^y^ate Additive 45 @ 96 46.4 2 Borresperse NA 7.00 3 Antispurant (SAS-1572) 0.50 4 AguafQS) 46.1 Total 100.00 The above composition was prepared following the process below: An aqueous solution was prepared using water, sodium lignosulfonate, and an antifoaming agent. Glyphosate acid was added to the mixture and homogenized. The homogenized solution was ground to a particle size of 8-10 microns in a grain mill to form a suspension. Microencapsulated pendimethalin was added to the glyphosate suspension concentrate to form the final ZC formulation. Example 17: ZC formulation pendimethalin + glyphosate The pendimethalin capsule suspension was prepared as described in Example 1. The glyphosate suspension concentrate was prepared according to the following formulation: ροοζηη / ζζηζ / Β / γι No. Efe Señe Component of the Formulacm % 1 PenámeíaSna 27 @ 45.7 % purity CS 66.34 2 Glossate acid il.75@ 45 % purity of suspension 26.11 3 Reax-ISQ M 2 00 4 2% of gd Rhodspoí-23 2.00 D- Proxel GXÍ 0.10 & Water (QS} 3.45 Total 100.00 The above composition was prepared using the following process: An aqueous solution was prepared using water, pendimethalin capsule suspension, sodium lignosulfonate, and xanthan gum. Glyphosate was added to the mixture and homogenized to obtain the final ZC formulation. The formulation was found to be stable at room temperature. Comparative examples: Pendimethalin compositions were prepared using other formulation types to compare efficacy, stability, and compatibility with respect to the ZC formulation: pooznn / zznz / B / Yi Example 18A: Pendimethalin + pyrazosulfuron ethyl WP formulations: Pendimethalin WP composition Serial No. Ingredients % w / w PencSmetaSna 45.5% @ 96% purity 47.46 2 Si-Olí A-1M 26.94 .3 Metasp^se 5505 g. 4 Supragil WP 4.5 5 Antifoam DC1929 1 5 Ammonium sulfate 16 Total 97.85 Composition WP pyrazosulfuron ethyl Serial No. Ingredients % w / w 1 PSE 1.1% @ 5% Purity Technology 1 16 2 Supragil WP 0.50 3 W A-180 0.5 Total 2.15 Process Step-1: Pendimethalin Premix a) Pendimethalin was melted and absorbed onto precipitated silica by slow addition at low rpm from a mixing vessel and held overnight. b) Metasperse 550s (modified styrene acrylic polymer), Supragil WP (sodium salt of dialkylnaphthalene sulfonate), ammonium sulfate and DC1920 Antifoam powder were added to the previous pendimethalin + silica mixture from step a) and mixed for homogeneity. c) The premix was ground in an air jet mill to obtain lump-free material. Step-2: Pyrazosulfuron ethyl premix a) Technical grade ethyl pyrazosulfuron, Supragil WP (sodium salt of dialkylnaphthalenesulfonate) and M-fill A-100 (precipitated silica) were mixed and ground in an air jet mill to obtain a particle size of Dg830-36 microns. Step 3: Mix The pendimethalin premix from Step 1 and the pyrazosulfuron premix from Step 2 were blended to obtain the final WP formulation. The resulting formulation was then subjected to stability tests: Physicochemical data of pendimethalin + pyrazosulfuron ethyl WP: ροοζηη / ζζηζ / Β / γι Serial No. Properties Environment 6 weeks in AHS at 45°C 7-month real-time data 1 Appearance Bitter powder that dissolves immediately Bitter orange powder Bitter and soft Bitter orange powder 2 Pendimethalin ali content 45.87 45.75 45.67 3 Ethyl proteosulfate ali content % w / w 1.85 1.082 (4.5% degradation) 8.92 (12% degradation) 4 Gravimetric suspensibility % w / w 84.39 68 58 5 Wetting time in seconds 40 20 38 6 Wet sieve retention % w / w 0.87 8.30 1.62 7 pH 1% aqueous suspension 6.89 0.71 680 Conclusion: 1. The formulation showed a drop in suspension capacity in AHS and real-time storage. 2. The degradation of pyrazosulfuron-ethyl was found to be 12% in only 7 months of real-time storage, which is very high compared to the stable formulations of example 1. 3. The formulation showed an increase in wet sieve retention in AHS, and an intense increase in wet sieve, i.e., 1.68% in only 7 months of real-time storage. ροοζηη / ζζηζ / Β / γι Example 18B: Pendimethalin + metribuzin WP formulations: 8.2.1 Composition WP pendimethalin Serial No. ingredients % w / w 1 Pendimethalin 38.7 % @ 97% purity 30.00 2 M-ISi A-100 22 3 Metasperse 55QS 7 4 Supragil WP 4.5 5 Antifoam DC1S20 1 5 Ammonium sulfate 15.05 Total 80.45 8.2.2 Composition WP metribuzin Serial No. Ingredients % w / w 1 Metribuzin 6.7% @ 95% purity technology 7.05 2 Supragil WP >3.50 3 M-fill A-100 2.00 4 Metasperse 5503 1.00 Total 10.55 Process: Step-1: Pendimethalin Premix 1. M-fill A-100 (precipitated silica), Metasperse 550s (modified styrene acrylic polymer) and Supragil WP (modified styrene acrylic polymer) were added to a mixing vessel and the molten pendimethalin technology was absorbed by slow addition at slow rpm. 2. Ammonium sulfate and DC1920 Defoamer (Antifoam) powder were then added and mixed until homogeneous. The material was stored overnight. Step 2: Metribuzin Premix 3. Technical Metribuzin, Metasperse 550 S (modified styrene-acrylic polymer), Supragil WP (modified styrene-acrylic polymer) and M-fill A-100 (precipitated silica) were premixed and ground in the air jet mill to obtain the particle size Dgs3036 mieras. Step 3: Mix The pendimethalin premix from Step 1 and the metribuzin premix from Step 2 were blended to obtain the final WP formulation. The resulting formulation was then subjected to stability tests: Physicochemical data of pendimethalin + metribuzin WP eaoznn / zznz / B / Yii No. Site Properties Environment 6 weeks in AHS at 45X 1 Appearance Soft, fluffy powder that W® freely Slightly soft, bumpy, orange-yellow powder 2 Pendimethalin active ingredient content %w / w 38.57 38.53 3 Active ingredient content % w / w 6.75 6.72 4 Suspensibility % w / w 88.48 40.29 5 Effective wetting time in seconds 17 30 6 Wet sieve retention % w / w 0.12 0.48 and pH 1% aqueous suspension 7.27 7.01 Conclusion of the WP formulation of pendimethalin with metribuzin: 1. The formulation showed reduced suspension in AHS and real-time storage at 6 weeks. 2. The formulation showed an increase in wet sieve retention in AHS. 3. There was a soft lump in AHS, which is undesirable. As used herein, the term ZC shall be used to designate mixed formulations of capsule suspensions and suspension concentrates, each of which may comprise a single herbicide or a combination of herbicides as described herein. Therefore, ZC is an aqueous suspension of microcapsules and solid particles, each of which may comprise one or more herbicidal active ingredients according to the present invention. The capsule suspension component typically comprises encapsulated pendimethalin, optionally in conjunction with another herbicide. The suspension concentrate component typically includes another herbicide or combination of herbicides.

Claims

1. A ZC composition, characterized in that it comprises: a) microencapsulated pendimethalin; and b) a co-herbicide suspension concentrate.

2. The ZC composition according to claim 1, further characterized in that the suspension concentrate comprises particles of a first herbicide selected from the group consisting of sulfonylurea herbicides, triazinone herbicides, imidazolinone herbicides, triazine herbicides, anilide herbicides, sulfonamide herbicides, organophosphate herbicides, amide herbicides, or alkanamide herbicides.

3. The ZC composition according to claim 1 or claim 2, further characterized in that the microencapsulated pendimethalin comprises a suspension of pendimethalin microcapsules in an aqueous phase, said microcapsules comprising a herbicidally effective amount of pendimethalin encapsulated within a polyurea polymer wall, said polyurea polymer wall constituting approximately 1% to approximately 20% by total weight of the suspension, said aqueous phase comprising at least one alkali or alkaline earth metal salt of an organic acid selected from the group consisting of acetic acid, propionic acid, citric acid, fumaric acid, tartaric acid, oxalic acid, succinic acid, valeric acid, malonic acid, glutaric acid, adipic acid, and italic acid,wherein said at least one alkali or alkaline earth metal salt of an organic acid is present in an amount ranging from approximately 2% to approximately 55% by weight of the suspension.

4. Composition ZC according to any of the preceding claims, further characterized in that the suspension concentrate comprises a herbicide, which is: (a) a sulfonylurea herbicide selected from the group consisting of amidosulfuron, azimsulfuron, bensulfuron or bensulfuron-methyl, chlorimuron, cyclosulfamuron, ethoxysulfuron, flazasulfuron, flucetosulfuron, flupyrsulfuron, foramsulfuron, halosulfuron, imazosulfuron, mesosulfuron, metazosulfuron, methiopyrisulfuron, monosulfuron, nicosulfuron, orthosulfamuron, oxasulfuron, primisulfuron, propirisulfuron, pyrazosulfuron or rimsulfuron, sulfometuron, sulfosulfuron, trifloxysulfuron, chlorsulfuron, cinosulfuron, etametsulfuron, iodosulfuron, iofensulfuron, metsulfuron or metsulfuron methyl, prosulfuron, tifensulfuron, triasulfuron, tribenuron, triflusulfuron and tritosulfuron;or (b) a triazinona herbicide selected from the group consisting of ametridiona, amibuzin, ethiozin, hexazinona, isomethiozin, metamitron and trifludimoxazin; or (c) an imidazolino herbicide selected from the group consisting of imazametabenz, imazamox, imazapir, imazaquin and imazetapir; o eaoznn / zznz / B / Yii (d) un herbicida de triazina seleccionado del grupo consistente en dipropetrín, trihidroxitriazine, atrazine, clorazine, cyanazina, ciprazina, eglinazina, ipazina, mesoprazina, prociazina, proglinazina, propazine, sebutilazine, simazina, trietazina de terbutilazine, indaziflam, triaziflam, atraton, metometón, prometón, secbumetón, simetón, terbumetón, ametrina, aziprotrina, cyanatrina, desmetrina, dimetametrina, metoprotrina, prometrina, terbutrina simetrinanda;or (e) an amide herbicide selected from the group consisting of alidochlor, amicarbazone, beflubutamide, benzadox, benzipram, bromobutide, cafenstrol, CDEA, ciprazole, dimethenamide, dimethenamide-P, diphenamide, epronaz, etnipromide, fentrazamide, flucarbazone, flupoxam, fomesafene, halosaphen, huangcaoling, isocarbamide, isoxabene, petoxamide, propizamide, quinonamid, tebutam, and thiafenacil; or (f) an anilide herbicide selected from the group consisting of chloranocril, cisanilide, chlormeprop, cypromide, diflufenican, erlujixiancaoan, etobenzanide, fenasulam, flufenican, ipfencarbazone, mefenacet, mefluidide, metamifop, monalide, naproanilide, pentanochlor, picolinafene, propanil, sulfentrazone, and triafamone;or (g) a chloroacetanilide herbicide selected from the group consisting of acetochlor, alachlor, butachlor, butenachlor, delachlor, diethyl, dimehachlor, etachlor, etaprochlor, metazachlor, metolachlor, metolachlor-S, pretylachlor, propachlor, propisochlor, prinachlor, terbuchlor, tenylchlor and xylchlor; or (h) a quinolinecarboxylic acid herbicide selected from the group consisting of quinclorac and quinmerac; or (i) a benzoylcyclohexanedione herbicide selected from the group consisting of phenquinetrione, ketospiradox, mesotrione, sulcotrione, tefuryltrione and tembotrione; or (j) a benzofuranyl alkylsulfonate herbicide selected from the group consisting of benfuresate and etofumesate; or (k) a dinitroanaline herbicide selected from the group consisting of benfluralin, butralin, chlornidine, dinitramine, dipropaline, ethalfluralin, fluchloralin, isopropaline, metapropaline, nitraline, prodiamine, profluralin, and trifluralin;or (I) a sulfonamide herbicide selected from the group consisting of asulam, carbasulam, fenasulam, penoxsulam and piroxsulam; or (m) a nitrophenyl ether herbicide selected from the group consisting of acifluorfen, aclonifen, bifenox, chloromethoxyfen, chloronitrofen, etnipromide, fluorodifen, fluoroglycofen, fluoronitrofen, fomesafen, fucaomi, furyloxyfen, halosafen, lactofen, nitrofen, nitrofluorfen and oxyfluorfen; or (n) an organophosphate herbicide selected from the group consisting of amiprofos-methyl, anilofos, bensulide, bilanafos, butamifos, clacifos, fosamine, and all their salts and esters, glufosinate-P, glyphosate and all their salts and esters, huangcaoling, piperofos and shuangjiaancaolin.; 5. The ZC composition according to any of the preceding claims, further characterized in that the suspension concentrate comprises a herbicide selected from the group consisting of atrazine, glyphosate and agrochemically acceptable derivatives thereof.

6. The ZC composition according to claim 4 or claim 5, further characterized in that the suspension concentrate comprises at least two herbicides.

7. A process for preparing a ZC formulation, said process being characterized in that it comprises: (a) forming an aqueous solution comprising at least one surfactant and a predefined amount of at least one alkali or alkaline earth metal salt of an organic acid; (b) forming an organic phase by melting a herbicidally effective amount of pendimethalin active ingredient and adding a predetermined amount of polyisocyanate wall-forming component; (c) dispersing said organic phase in said aqueous solution to obtain an emulsion to form an interface between discrete organic phase droplets and the aqueous phase; (d) maintaining said emulsion for a period of time sufficient to permit substantial completion of the polyisocyanate self-polymerization reaction such that said liquid droplets in the organic phase become capsules comprising polyurea shells enclosing pendimethalin active ingredient;(e) forming a suspension comprising dispersant, water, surfactants and co-formulants to obtain a suspension and adding the first herbicide to the suspension; (f) grinding the suspension to a desired particle size and mixing the resulting dispersion with the capsule suspension dispersion or mixing the drained microcapsules with the suspension; and (g) combining the microencapsulated portion of the formulation with the suspension.

8. A process for preparing a ZC formulation, said process being characterized in that it comprises: (a) forming an aqueous solution comprising at least one surfactant and a predefined amount of at least one alkali or alkaline earth metal salt of an organic acid and optionally heating said aqueous solution; (b) forming an organic phase by melting a herbicidally effective amount of pendimethalin active ingredient and adding a predetermined amount of a first wall-forming component to said organic phase; (c) dispersing said organic phase in said aqueous solution to obtain an emulsion and optionally heating said emulsion formed;(d) adding a second wall-forming component to said emulsion such that said second wall-forming component reacts with said first wall-forming component within said emulsion to form a polymer wall encapsulating at least said herbicidally effective amount of the active ingredient pendimethalin; (e) forming a suspension comprising water, at least one co-herbicide, surfactants, and co-formulants; (f) milling the suspension to a desired particle size to form a stable co-herbicide suspension; and (g) combining the microencapsulated portion of the formulation with the suspension.

9. A method for controlling weeds in a location, characterized in that it comprises applying to the weed location, or to the foliage of plants, or to soil or water containing seeds or other propagating organs thereof, a herbicidally effective amount of a ZC formulation comprising microencapsulated pendimethalin and a co-herbicide, which is: (a) a sulfonylurea herbicide selected from the group consisting of amidosulfuron, azimsulfuron, bensulfuron or bensulfuron-methyl, chlorimuron, cyclosulfamuron, ethoxysulfuron, flazasulfuron, flucetosulfuron, flupirsulfuron, foramsulfuron, halosulfuron, imazosulfuron, mesosulfuron, metazosulfuron, methiopyrisulfuron, monosulfuron, nicosulfuron, orthosulfamuron, oxasulfuron, primisulfuron, propirisulfuron, pyrazosulfuron or rimsulfuron, sulfometuron, sulfosulfuron, trifloxysulfuron, chlorsulfuron, cinosulfuron, etametsulfuron, iodosulfuron, iofensulfuron, metsulfuron or metsulfuron methyl, prosulfuron, tifensulfuron,triasulfuron, tribenuron, triflusulfuron and tritosulfuron; or (b) a triazinone herbicide selected from the group consisting of ametridione, amibuzin, etiozin, hexazinone, isometiozin, metamitron and trifludimoxazin; or (c) an imidazolinone herbicide selected from the group consisting of imazametabenz, imazamox, imazapyr, imazaquin and imazethapyr; or (d) a triazine herbicide selected from the group consisting of dipropetrin, trihydroxytriazine, atrazine, chloroazine, cyanazine, cypriazine, eglinazine, ipazine, mesoprazine, procyanazine, proglinazine, propazine, sebutylazine, simazine, trietazine, terbuthylazine, indaziflam, triaziflam, atraton, methometon, prometon, secbumeton, simeton, terbumeton, ametryn, aziprothrin, cyanathrin, desmethrin, dimetamethrin, methopratrin, prometrine, simethrin, and terbutryn; or (e) an amide herbicide selected from the group consisting of alidochlor, amicarbazone, beflubutamide, benzadox, benzipram, bromobutide, cafenstrol, CDEA, ciprazole,eaoznn / zznz / B / Yii dimethenamide, dimethenamide-P, diphenamide, epronaz, etnipromide, fentrazamide, flucarbazone, flupoxam, fomesafene, halosaphen, huangcaoling, isocarbamide, isoxabene, petoxamide, propizamide, quinonamid, tebutam and thiafenacil; or (f) an anilide herbicide selected from the group consisting of chloranocril, cisanilide, chlormeprop, cypromide, diflufenican, erlujixiancaoan, etobenzanide, fenasulam, flufenican, ipfencarbazone, mefenacet, mefluidide, metamifop, monalide, naproanilide, pentanochlor, picolinafene, propanil, sulfentrazone and triafamone; or (g) a chloroacetanilide herbicide selected from the group consisting of acetochlor, alachlor, butachlor, butenachlor, delachlor, diethyl, dimetachlor, etachlor, etaprochlor, metazachlor, metolachlor, metolachlor-S, pretylachlor, propachlor, propisochlor, prinachlor, terbuchlor,(h) a quinolinecarboxylic acid herbicide selected from the group consisting of quinclorac and quinmerac; or (i) a benzoylcyclohexanedione herbicide selected from the group consisting of phenquinetrione, ketospiradox, mesotrione, sulcotrione, tefuryltrione, and tembotrione; or (j) a benzofuranyl alkylsulfonate herbicide selected from the group consisting of benfuresate and etofumesate; or (k) a dinithoralin herbicide selected from the group consisting of benfluralin, butralin, chlornidine, dinitramine, dipropaline, ethalfluralin, fluchloraline, isopropaline, metapropaline, nitraline, prodiamine, profluralin, and trifluralin; or (I) a sulfonamide herbicide selected from the group consisting of asulam, carbasulam, fenasulam, penoxsulam and piroxsulam; or (m) a nitrophenyl ether herbicide selected from the group consisting of acifluorfen, aclonifen, bifenox, chloromethoxyfen, chlorotrofen, etnipromide, fluorodifen, fluoroglycophene,(n) fluoronitrofen, fomesafen, fucaomi, furyloxyfen, halosafen, lactofen, nitrofen, nitrofluorfen, and oxyfluorfen; or (n) an organophosphate herbicide selected from the group consisting of amiprofos-methyl, amiprofos, anilofos, bensulide, bilanafos, butamifos, clacifos, phosamine, and all their salts and esters, glufosinate-P, glyphosate and all their salts and esters, huangcaoling, piperofos, and shuangjiaancaolin.

10. A multi-package herbicide product for one-site weed control, characterized in that it comprises: (a) a ZC composition comprising microencapsulated pendimethalin; and a co-herbicide suspension concentrate; and (b) an instruction manual including instructions for administering the