the glyphosate type herbicides which may be employed in the present invention are generally compounds of formulae i and ia below , as well as their metabolites and derivatives : ## str1 ## wherein r is a hydrogen atom ; lower alkyl ; lower alkenyl ; lower alkoxyalkyl ; aryl ( e . g . phenyl ) having 6 to 10 carbon atoms and being unsubstituted or substituted by 1 to 3 substituents chosen independently from lower alkyl , lower alkoxy , halo , trifluoromethyl , nitro and cyano ; or a salt - forming cation ; and r 1 and r 2 , which are identical or different , are a hydrogen atom ; lower alkyl ; aryl having 6 to 10 carbon atoms and being unsubstituted or substituted by 1 to 3 substituents chosen independently from lower alkyl , lower alkoxy , halogen , trifluoromethyl , nitro and cyano ; biphenyl ; or an herbicidally - acceptable salt - forming cation ; or ## str2 ## wherein r 3 and r 4 , which are identical or different , are a hydrogen atom ; lower alkyl ; aryl having 6 to 10 carbon atoms and being unsubstituted or substituted by 1 to 3 substituents chosen independently from lower alkyl , lower alkoxy , halogen , trifluoromethyl , nitro and cyano ; or biphenyl ; and z 1 is cyano or coor 5 , wherein r 5 is as hereinbefore defined for r , except that r 5 is not a cation . the preferred compounds of formula i and ia are those in which z and z 1 are coor and coor 5 respectively . with regard to formula i , the preferred compounds are those in which r , r 1 and r 2 , which may be identical or different , are a hydrogen atom or an herbicidally acceptable cation . organic ammonium salts of formula i , especially those in which r is a cation derived from isopropylamine , give good results and are available on the market . organic sulphonium or sulphoxide salts ( e . g . those in which r 1 and / or r 2 are the trimethylsulphonium cation or trimethylsulphoxide cation ) are also suitable . an example of a compound of formula i or ia is the isopropylamine salt of n -( phosphonomethyl ) glycine which is the active ingredient in the herbicide marketed by monsanto under the trade name roundup . with regard to formula ia , the preferred compounds are those in which r 3 and r 4 , which may be identical or different , are lower alkyl or aryl ( e . g . phenyl ), and in which z 1 is coor 5 , wherein r 5 is lower alkyl or aryl . suitable salt - forming cations and anions within the definitions of r , r 1 , r 2 and z 2 are compatible from a herbicidal point of view and do not vitiate the herbicidal properties of the compounds . the salified form is generally more soluble in water and more advantageous than the free acid or the corresponding free base . examples of suitable cations include alkali metal cations such as sodium or potassium ; alkaline earth metal cations such as calcium or magnesium ; and cations of copper , zinc , iron , nickel , manganese , ammonium or organic ammonium , phosphonium , sulphonium or sulphoxide , these cations preferably having a molecular weight less than 300 . suitable organic cations of ammonium include amine derivatives , especially aliphatic , cyclic or heterocyclic amines containing 1 or 2 amine groups , such as alkylamines , alkyleneamines , alkenylamines and alkanolamines . examples of amine derivatives include methylamine , ethylamine , n - propylamine , iso - propylamine , n - butylamine , iso - butylamine , sec - butylamine , n - amylamine , iso - amylamine , hexylamine , heptylamine , octylamine , nonylamine , decylamine , undecylamine , dodecylamine , tridecylamine , tetradecylamine , pentadecylamine , hexadecylamine , heptadecylamine , octadecylamine , methylethylamine , methyliso - propylamine , methylhexylamine , methylnonylamine , methylpentadecylamine , methyloctadecylamine , ethylbutylamine , ethylheptylamine , ethyloctylamine , hexylheptylamine , hexyloctylamine , dimethylamine , diethylamine , di - n - propylamine , diiso - propylamine , di - n - amylamine , diiso - amylamine , dihexylamine , diheptylamine , dioctylamine , trimethylamine , triethylamine , tri - n - propylamine , triisopropylamine , tri - n - butylamine , triiso - butylamine , tri - sec - butylamine , tri - n - amylamine , n - propanolamine , isopropanolamine , diethanolamine , n , n &# 39 ;- diethylethanolamine , n - ethylpropanolamine , n - butylethanolamine , allylamine , n - butenyl - 2 - amine , n - pentenyl - 2 - amine , 2 , 3 - dimethylbutenyl - 2 - amine , dibutenyl - 2 - amine , n - hexenyl - 2 - amine and propylenediamine , primary aromatic amines such as aniline , methoxyaniline , ethoxyaniline , ortho -, meta - and para - toluidine , phenylenediamine , 2 , 4 , 6 - tribromoaniline , benzidine , naphthylamine , and ortho -, meta - and para - chloroaniline , and heterocyclic amines such as pyridine , morpholine , piperidine , pyrrolidine , indoline and azepine . among suitable organic cations of sulphonium and sulphoxide are c 1 to c 10 alkyl ( preferably c 1 to c 5 alkyl ) sulphonium cations and c 1 to c 10 alkyl ( preferably lower alkyl ) sulphoxide cations , such as trimethylsulphonium , ethyldimethylsulphonium , tripropylsulphonium , trimethyl sulphoxide and triethyl sulphoxide . these salts are described in particular in u . s . pat . no . 4 , 315 , 765 . suitable phosphonium cations include those represented by the formula : ## str3 ## wherein r a , r b , r c and r d , which may be identical or different , are phenyl or c 1 to c 10 alkyl radicals , preferably lower alkyl . these salts are described in u . s . pat . no . 4 , 341 , 549 . other examples of suitable cations are described in u . s . pat . no . 3 , 799 , 758 . compatible anions which are suitable include chloride , bromide , fluoride , sulphate , sulphite , bisulphite , phosphate , orthophosphate , carbonate , bicarbonate , acetate , butyrate , benzoate and maleate anions . examples of compounds of formulae i and ia are described in u . s . pat . nos . 3 , 799 , 758 , 3 , 835 , 000 , 3 , 950 , 402 , 4 , 067 , 719 , 4 , 008 , 296 , 4 , 147 , 719 and 4 , 369 , 142 . a large number of compounds which are metabolized by green plants or which function in a manner equivalent to that of the active part ( from a phytotoxic point of view ) of glyphosate may also be employed . these compounds include , for example , compounds represented by formulae i and ia and the following formulae : ## str4 ## wherein : z 2 , r 1 , r 2 , r 3 and r 4 are as hereinbefore defined ; z 4 is ch 2 cn ; conhoh ( or its tautomeric form -- c ( oh )═ noh ); ch 2 coor , wherein r is as hereinbefore defined ; or conr 7 r 8 , wherein r 7 and r 8 , which may be identical or different , are as hereinbefore defined for r ; z 3 is -- ch 2 -- cn ; -- co -- nhoh ( or its tautomeric form -- c ( oh )═ noh ); -- ch 2 -- coor 5 ; or -- conr 5 r 5 wherein the groups r 5 , which may be identical or different , are as hereinbefore defined ; and r 50 is lower alkyl , lower alkoxy , hydroxy , lower alkanoyl , substituted or unsubstituted arylcarbonyl , trifluoroacetyl , lower alkylthioalkanoyl , amino , alkylamino , nitro , nitroso , or radical -- coor 9 , -- och 2 -- coor 10 , -- ch 2 p ( o ) or 15 ( or 25 ), -- s ( o ) m -- r 11 , -- so -- x -- r 11 or -- co -- s ( o ) m -- r 12 , wherein r 9 is lower alkyl , lower alkenyl or unsubstituted or substituted aryl group ; and r 11 is lower alkyl or unsubstituted or substituted aryl group ; x is -- o -- or -- s --; and r 12 is lower alkyl , lower alkenyl , lower alkynyl , unsubstituted or substituted aryl or unsubstituted or substituted ( lower ) arylalkyl ; m is 0 , 1 or 2 ; r 15 , r 25 and r 10 are as hereinbefore defined for r 1 ; r 6 is a hydrogen atom , lower alkyl , unsubstituted or substituted aryl , unsubstituted or substituted lower arylalkyl , coor 5 or -- p ( o )( or 3 )( or 4 ), wherein r 3 , r 4 and r 5 are as hereinbefore defined . compounds of formulae ii to viia are generally known and may be prepared by known methods or similar methods . these products and methods are described in u . s . pat . nos . 4 , 035 , 177 , 4 , 062 , 669 , 4 , 175 , 946 , 4 , 251 , 258 , 4 , 231 , 782 , 4 , 322 , 238 , 4 , 322 , 239 , 4 , 323 , 387 , 4 , 300 , 942 , 4 , 300 , 943 and 4 , 414 , 158 ; research disclosure no . 220 , 001 ( derwent no . 73 , 821 e / 35 ); united kingdom patent nos . 2 , 090 , 596 and 2 , 072 , 179 ; and japanese patent nos . 56 , 139 , 408 , 57 , 120 , 595 and 57 , 099 , 597 ( derwent nos . 8191755d , 8273692e and 8262700e ). the ( phenoxy - substituted ) benzoic derivatives which may be employed in the present invention include 2 - nitro - 5 - phenoxy substituted benzoic acids and their derivatives , of formula viii below . ## str5 ## wherein : r 13 and r 14 , which may be identical or different , are hydrogen or methyl ; and z 9 is hydroxy , alkoxy ( especially lower alkoxy ), ( lower ) alkanesulphonamido or om ( m being an atom of an alkali metal or alkaline earth metal , more particularly na or k ). among these compounds , compounds of formula viii wherein z 6 is cf 3 , z 8 is nitro , z 5 is chlorine and z 7 is hydrogen are preferred , because these more particularly meet the objectives of the present invention listed in the preamble . among these , the following are preferred : acifluorfen , wherein p is o , r 13 and r 14 are hydrogen and z 9 is hydroxy ; or the potassium or sodium salts of acifluorfen , wherein z 9 is om and m is na or k ; fomesfen , wherein p is 0 and z 9 is methanesulphonamido (-- nh -- so 2 ch 3 ); lactofen and benzofluorfen , wherein p is 1 , r 13 and r 14 are hydrogen and z 9 is oet . among the latter , acifluorfen - sodium is preferred . the herbicidal compositions of the present invention which comprise a glyphosate type herbicide and a phenoxybenzoic type herbicide may contain mixtures of the active substances and known ingredients such as surfactants , carriers and diluents . the compositions generally comprise the active ingredients in association with a herbicidally acceptable diluent or carrier . if the composition contains two active ingredients , the systemic glyphosate herbicide and the phenoxybenzoic derivative , or more than two active ingredients , it is desirable that the compositions are suitably mixed to achieve homogeneity . the compositions of the invention may be in the form of a mixture comprising both the glyphosate and phenoxybenzoic compound . alternatively , the glyphosate and phenoxybenzoic compounds may be provided separately , for example in the form of a pack or kit containing each of the compounds for tank - mixing prior to application or for separate or sequential application . the present invention also relates to a weed control method which comprises applying an effective quantity of a herbicidal composition to the weeds to be destroyed . the method is applied with the object of destroying the weeds and enables , in particular , weed growth to be controlled and where appropriate , the weeds to be totally or partially destroyed . the herbicidal compositions or mixtures of active substances , as described above and which can be used according to the present invention , are applied in a suitable manner to plant leaves and in particular to the weeds to be destroyed , for example when the latter carry green foliage . the herbicidal compositions may also be applied shortly before harvest in order to kill weeds having roots which persist in the soil after harvest . thus , the invention makes it possible to plant shortly after harvest without having to carry out mechanical weeding operations ( manual or otherwise ). however , this method is reserved for cases in which the applied herbicides do not leave residues and / or are not selective against the crops to be planted after the harvest . in general , the systemic glyphosate type compound is applied to plants at rates from about 0 . 1 , preferably about 0 . 3 , to about 0 . 9 kg / ha , more preferably from approximately 0 . 4 to approximately 0 . 8 kg / ha and especially from approximately 0 . 5 to approximately 0 . 7 kg / ha . compounds of formula viii are used as chemical substances which modify membranes , and are applied in doses from approximately 0 . 004 to approximately 0 . 08 kg / ha and preferably from approximately 0 . 01 to approximately 0 . 05 kg / ha . the ratio by weight of phenoxybenzoic type herbicide to glyphosate type herbicide is from about 1 : 12 to about 1 : 80 and preferably from about 1 : 15 to about 1 : 50 . the invention provides compositions which have a good resistance to being washed out by rain after application ; and compositions which have a high activity on plants at the end of their growth cycle and / or plants having a slow growth rate . using the compositions of the present invention , an effective control of the following weeds is observed : dicotyledonous plants : xanthium , ipomoea , sesbania , abutilon , polygonum , amaranthus , chenopodium , sinapis , datura , solanum , euphorbia , bidens and galinsoga ; and monocotyledonous plants : ( graminaceous plants ) setaria and echinochloa . the present invention provides a method for the control of the growth of weeds at a locus which comprises applying thereto , post - emergence of the weeds , about 0 . 1 , preferably about 0 . 3 , to about 0 . 9 kg / ha of a glyphosate type herbicide and about 0 . 004 to about 0 . 08 kg / ha of a phenoxybenzoic type herbicide , the ratio of phenoxybenzoic herbicide to glyphosate type herbicide being from about 1 : 12 to about 1 : 80 by weight . the invention also provides a method for the control of the growth of weeds at a locus , the weeds being at the end of their growth cycle and / or having their growth slowed down by low temperatures and / or low humidity . the method comprises applying thereto about 0 . 1 , preferably about 0 . 3 , to about 0 . 9 kg / ha of a glyphosate type herbicide and about 0 . 004 to about 0 . 08 kg / ha of phenoxybenzoic herbicide , the ratio of phenoxybenzoic type herbicide to glyphosate type herbicide being from about 1 : 12 to about 1 : 80 by weight . another feature which the invention provides is a method for reducing wash out by rainfall of a glyphosate type herbicide after post - emergence application to control the growth of weeds at a locus which comprises applying thereto about 0 . 1 , preferably about 0 . 3 , to about 0 . 9 kg / ha of a glyphosate type herbicide and about 0 . 004 to about 0 . 08 kg / ha of a phenoxybenzoic type herbicide , the ratio of phenoxybenzoic type herbicide to glyphosate type herbicide being from about 1 : 12 to about 1 : 80 by weight . the methods according to the present invention make it possible to control a wide spectrum of monocotyledonous or dicotyledonous annual and perennial weeds . the weeds may be destroyed by the methods and the compositions of the present invention , enabling the field to be left in good condition for the subsequent growth of crops such as cereals , wheat , rice , cotton , soybeans , beets ( especially sugarbeets ), sunflowers , rapeseeds , sugarcane and vegetable crops , and for achieving an effective weed control in perennial crops ( grape vines and orchards ). because the herbicidal effect appears and becomes effective shortly after treatment ( much earlier than with glyphosate type herbicide alone , even when it is employed in higher doses ), the method and the composition according to the present invention also make it possible to control plants , especially weeds , quickly . the method according to the present invention also makes it possible to prevent glyphosate or its derivatives from being washed out . the invention provides a method which makes it possible to prevent glyphosate or one of its derivatives , for example compounds of formula i or ia , from being washed out , comprising applying glyphosate or one of its derivatives , and a phenoxybenzoic type compound , for example compounds of formula viii , using the doses and ratios by weight defined above . when the method of the present invention is put into practice , the herbicidal compositions generally contain one or more ingredients other than the glyphosate type and phenoxybenzoic type compounds and their derivatives ( hereinafter referred to as active ingredients ). these compositions , which may be employed as herbicidal agents , generally contain the active ingredients in association with solid or liquid carriers which are acceptable in agriculture and surface - active agents which are acceptable in agriculture . the usual inert carriers and surface - active agents may be employed . these compositions form part of the present invention . the composition may also contain other ingredients such as protective colloids , adhesives , thickeners , thixotropic agents , agents which facilitate penetration , activators , stabilizers , and sequestering agents as well as other known active ingredients having pesticidal properties ( especially insecticides , fungicides or herbicides ) or plant growth regulating properties . more generally , the compositions employed in the present invention may contain all the solid or liquid additives corresponding to conventional methods of formulation . in the following description of the present invention , unless otherwise stated , the percentages are expressed on a weight basis . the compositions of the invention may also contain activators . the activators are compounds which do not have herbicidal properties at normal doses ( approximately 0 . 5 kg / ha to approximately 5 kg / ha ), but which have a capacity to increase significantly the herbicidal activity of glyphosate type compounds . most of these activators are well known . as described below , some activators are surfactants , especially ethylene oxide polycondensate derivatives of phenols , alcohols or amines . some activators are ammonium salts , especially chlorides , sulphates and inorganic or organic phosphates of ammonium . other activators may be employed . the activators which normally increase the herbicidal activity of glyphosate type compounds are also useful in the present invention when phenoxynitrobenzoic acid derivatives are employed . the quantity of activators employed in the compositions of the present invention is generally from approximately 0 . 1 % to approximately 500 % of the quantity of the glyphosate type compound and preferably from approximately 50 % to approximately 350 %. this percentage depends on the specific nature of the activators employed . in general , the compositions according to the present invention usually contain approximately 0 . 05 % to approximately 95 % of one or more active ingredients according to the present invention , approximately 1 % to approximately 95 % of one or more solid or liquid carriers and optionally , approximately 0 . 1 % to approximately 50 % of one or more surface - active agents . the compositions preferably contain about 10 % to about 50 % by weight of the combination of the glyphosate type and phenoxybenzoic type herbicides , preferably compounds of formulae i and viii , and more preferably about 15 % to about 30 %. as mentioned above , the active ingredients employed in the present invention are generally combined with carriers and optionally with surface - active agents . in the description of the invention , the term &# 34 ; carrier &# 34 ; denotes a natural or synthetic organic or inorganic ingredient with which the active ingredients are combined in order to facilitate application to the plant or the soil . this carrier is generally inert and must be acceptable in agriculture , especially with respect to the plant treated . the carrier may be solid ( e . g . clays , natural or synthetic silicates , silica , resins , waxes , and solid fertilizers ) or liquid ( e . g . water and alcohols , especially butanol ); esters , especially methylglycol acetate ; ketones , especially cyclohexanone and isophorone ; petroleum fractions ; aromatic or paraffinic hydrocarbons , especially xylenes ; chlorinated aliphatic hydrocarbons , especially tricholoroethane , or chlorinated aromatic hydrocarbons , especially chlorobenzenes ; water - soluble solvents such as dimethylformamide , dimethyl sulphoxide or n - methylpyrrolidone ; and liquefied gases . the surface - active agent may be an emulsifier , dispersant or wetting agent of ionic or nonionic type , or alternatively , a mixture of these surface - active agents . examples include polyacrylic acid salts , lignosulphonic acid salts , phenolsulphonic or naphthalenesulphonic acids , products of polycondensation of ethylene oxide with fatty alcohols , fatty acids or fatty amines , substituted phenols ( especially alkylphenols or arylphenols ), sulphonosuccinic acid ester salts , taurine derivatives ( especially aklyl taurates ), phosphoric esters of alcohols or products of polycondensation of ethylene oxide with phenols , esters of fatty acids with polyhydric alcohols , and derivatives having sulphate , sulphonate and phosphate groups , of the compounds above . the presence of at least one surface - active agent is generally preferred . the active ingredients of the present invention are generally applied in the form of compositions . these compositions are themselves in different solid or liquid forms . forms of the compositions include water - soluble powders ( having an active ingredient content which may reach 80 %) and water - soluble granules especially those obtained by extrusion , compacting , impregnation of a granular carrier , or by granulation starting with a powder ( the active ingredient content in these granules being from approximately 0 . 5 % to approximately 80 %) and aqueous solutions . the water - soluble concentrates or solutions ( especially powders or granules ) also generally contain approximately 5 % to approximately 80 % of active ingredients , whereas the emulsions or solutions which are ready for application generally contain approximately 0 . 01 % to approximately 20 % of active ingredients . in addition to the solvent , the solutions or concentrates may contain approximately 2 % to approximately 50 % of suitable additives such as stabilizers , surface - active agents , agents facilitating penetration , corrosion inhibitors , colouring agents or adhesives . irrespective of the concentration required , emulsions which are particularly suitable for application to plants may be prepared from these concentrates by diluting with water . the aqueous dispersions , solutions or mixtures may be applied to crop plants to be weeded , by any suitable means , for example by spraying , at rates which are generally of the order of approximately 100 1 / ha to approximately 1 , 200 1 / ha of spraying mixtures . the compositions according to the present invention are suitably applied to the vegetation and especially to the weeds to be destroyed , when the latter carry green foliage . application of the herbicidal composition after the germination of different species of plants ( in a glasshouse ) 7 × 7 × 8 cm pots were filled with light sand for cropping , and a certain number of seeds , depending on the plant species and the seed thickness , were planted . the seeds were then covered with an approximately 3 mm thick layer of soil , and the seeds were allowed to germinate until they reach a convenient stage of growth . the treatment stage for graminaceous plants is the &# 34 ; second - leaf formation &# 34 ; stage . the treatment stage for dicotyledonous plants is the &# 34 ; cotyledon opening and first true leaf development &# 34 ; stage . the pots were then treated by spraying a quantity corresponding to an application rate of 500 1 / ha by volume , containing the active substances at their desired concentrations . the spraying mixture contained a tank - mix , prepared by mixing : an aqueous solution containing 240 g / l of acifluorfen - sodium ( the concentration in g / l as well as the doses in g / ha refer to the acid form of acifluorfen ), and an aqueous solution containing 360 g / l of the isopropylammonium salt of n - phosphonomethylglycine ( which is the acid form of glyphosate ; the concentration in g / l as well as the doses in g / ha refer to the acid form ), and different active substance concentrations of the spraying liquid were employed , corresponding to the different doses of active substances applied . the treated pots were then placed in tanks designed to receive irrigation water by sub - irrigation and they were maintained at ambient temperature for 29 days at a relative humidity of 70 %. at 13 days after treatment ( t + 13 ) and 29 days after treatment ( t + 29 ), the number of live plants in the pots treated with the spraying liquid containing the active substances to be tested were counted and the number of live plants in a control pot treated under the same conditions , but with a spraying liquid which did not contain the active substances were also counted . a percentage equal to 100 % indicates that there was total destruction of the plant species under consideration , and a percentage equal to 0 % indicates that the number of live plants in the treated pot was identical to that in the control pot . the plant species used in example 1 were morning glory ( ipomoea purpurea ) and potherb purslane ( portulaca oleracea ). the tests carried out demonstrate the remarkably early herbicidal effect of the compositions according to the present invention in post - emergence treatments . the following results were obtained . table 1______________________________________weedand glypho - acifluorfen : 10 g / hadates of sate no ipomoea portulacatreat - doses acifluor - t + 13 t + 29 t + 13 t + 29ment g / ha fen 0 0 10 10______________________________________ipomoea 125t + 13 0 0 -- -- -- t + 29 0 -- 0 0 -- portulaca 125t + 13 0 -- -- 80 -- t + 29 10 -- -- -- 80ipomoea 250t + 13 0 20 -- -- -- t + 29 0 -- 20 -- -- portulaca 250 -- -- -- -- t + 13 0 -- -- 98 -- t + 29 20 -- -- -- 95______________________________________ table ii______________________________________weedand glypho - acifluorfen : 20 g / hadates of sate no ipomoea portulacatreat - doses acifluor - t + 13 t + 29 t + 13 t + 29ment g / ha fen 0 0 20 10______________________________________ipomoea 125t + 13 0 0 -- -- -- t + 29 0 -- 80 -- -- portulaca 125t + 13 0 -- -- 90 -- t + 29 10 -- -- -- 90ipomoea 250t + 13 0 98 -- -- -- t + 29 0 -- 80 -- -- portulaca 250t + 13 0 -- -- 100 -- t + 29 20 -- -- -- 100______________________________________ the field was divided into 5 meter squared plots . several species were sown in each plot , in rows 15 cm apart . the species included the following monocotyledonous weeds : ______________________________________wild oat : avena fatua ( avefa ) cockspur grass : echinochloa crus - galli ( echcg ) ryegrass : lolium multiflorum ( lolmu ) panic grass : panicum miliaceum ( panmi ) ______________________________________ when all the plants reached the 2 - 3 leaf stage , i . e . approximately 3 weeks after sowing , treatments were applied by preparing tank mixes of active ingredients at suitable concentrations and spraying them on the rows of plants at a volume of 500 1 / ha in order to obtain adequate rates . an untreated plot was placed in contiguity with each treated plot for comparison and rating . the ratings were carried out at different times after the treatment and are expressed as percentages of destruction for each species , in comparison with the same species in the untreated plot . in this specific example , rain ( 20 mm water ) washed the plants 15 hours after treatment . the herbicidal effect was observed 5 days after treatment . the same active ingredients were used as in the previous example . the following results were obtained : table iii__________________________________________________________________________active dosesingredients g / ha avefa echcg lolmu panmi amare sinar__________________________________________________________________________acifluorfen 50 9 7 . 5 6 . 5 7 . 5 25 22 . 5sodiummixture of both 200 + 5 27 . 5 35 37 . 5 37 . 5 60 40active glyphosate 400 + 5 70 67 . 5 62 . 5 67 . 5 70 65salt formulation and 400 + 20 70 70 62 . 5 72 . 5 85 72 . 5acifluorfen sodiumsolution__________________________________________________________________________
the invention relates to herbicidal compositions containing a glyphosate type herbicide and a phenoxybenzoic type herbicide , preferably acifluorfen - sodium , the ratio by weight of phenoxybenzoic type herbicide : glyphosate type herbicide ranging between about 1 : 12 and about 1 : 80 . the compositions are relatively fast - acting and resistant to being washed out during rainfall occurring shortly after application . the invention also relates to a method of weed control employing the compositions .