DD154956A5 - HERBICIDAL AGENT AND METHODS OF COMBATING UNUSUAL PLANT GROWTH - Google Patents

Abstract

The invention relates to novel herbicidal compositions which, in addition to conventional auxiliaries and traeger substances, and optionally further herbicides as the active ingredient. 3- (3-methyl-4-isopropylphenyl) -1,1-dimethylurea. The active ingredient is particularly suitable for controlling weeds that grow in crops such as corn, barley and especially wheat.

Description

A herbicidal composition and method for controlling undesirable plant growth .

The invention relates to herbicidal compositions and to a method for controlling weeds,

Characteristic of the known technical solutions:

In US Patent No. 2,655,447 is an extremely wide class of urea derivatives described having herbicidal properties in the period of over 25 years since production of these compounds much research has been done on the use of ureas as herbicides ₀ Probably wichtigtste urea derivative is the Compound 3- (4-isopropylphenyl) -1,1-dimethylurea sold under the trade name "Isoproturon". This compound is widely used in Europe for controlling weeds in winter cereals. Its main advantage is that it is exceptionally effective against a variety of weeds and can be used as both preemergence and postemergence herbicides in both autumn and spring. Ihr.Hauptnachteil

- * 2- O O ^ 7 Π Q

daxirij exists that some economically important weeds in particular perennial broadleaf weeds,. blocking grass weeds, creeping weed and honor prize are not combated ©

Aim of the invention

The invention aims to provide improved herbicides «

It has been found that a certain phenylurea derivative, which is not expressly mentioned in US Pat. No. 2,655, W-7, in which the phenyl ring has two special substituents, has particularly favorable herbicidal properties. .

It is a compound of the general formula I, ie 3- (3-methyl-4-isopropylphenyl) -1,1-dimethylurea. This compound is particularly suitable for controlling before or after emergence of weeds, in crops such as maize, barley or especially "wheat growing". As shown by the data presented in Examples 4-5, this compound has distinct advantages over your commercially available herbicide isoproturon for control of weeds in wheat, "

The invention thus relates to a herbicidal composition containing the compound of the formula I together with a suitable carrier. The invention also relates to a method for controlling unwanted plants at a site which is characterized in that the compound or a compound in the site Means according to the invention «

It may be favorable in some cases, the inventive

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Connection with; one or more compounds having herbicidal activity, e.g. Thus, the compound of the invention can be mixed with other broad spectrum herbicides such as 2- (4-chloro-6-ethylamino-s-triazin-2-ylamino) -2-methylpropionitrile (trade name "Cyanazines") or with more specific herbicides with a narrower spectrum of activity such as herbicides against aniline pin-ug, as described in GB-PS 1,164,160, eg Ethyl N-benzyl-H- (3,4-dichlorophenyl) -2-aminopropionate (trade name "Benzoylpropäthyl") and the racemic mixture or methyl-N-benzoyl-N- (3-chloro-4-fluorophenyl) -2- aminopropionate (trade names "Flampropisopropyl" and Flampropmethyl ")",

A carrier in an agent according to the invention is any substance with which the active ingredient is prepared in order to facilitate its application to the site to be treated, Z ₀ B ₀ a plant, seed or soil, or its storage, transport or handling. A carrier can be a solid or a liquid, including substances that are usually gaseous but have been compressed to a liquid, and any of the usual ways of preparing carriers used in herbicidal compositions can be used.

Suitable solid supports include other natural and synthetic clays and silicates, eg, natural silicas such as diatomaceous earth; Magnesium silicates, eg _o Talke? Magnesium aluminum silicates, z «B. Attapulgites and vermiculites; Aluminum silicates, ZpB. Kaolinites, montmorillonites and mica, calcium carbonate, calcium sulfate; synthetic hydrated silicas and synthetic calcium or aluminum silicates? Elements, eg carbon and sulfur; natural

and synthetic resins, ζ "Β" coumarone resin, polyvinyl chloride and styrene polymers and copolymers, solid polychlorophenols, Bitum.ina _s waxes _s c _e B _e beeswax, paraffin wax and chlo "> tured mineral waxes, and solid fertilizers Mitel, z <3rd Superphosphates "

Suitable liquid carriers include water, Alkoho® · Ie _$ Z ₀ B ₆ isopropanol and glycols? Ketone, z _e B «acetone ^ Me-. ethyl ethyl ketone, methyl isobutyl ketone and cyclohexanone? Ether5 aromatic or aliphatic © Hydrocarbons $ z _e B _e Ben · zolj Toluene and xylene? Petroleum fractions, such _e B _e kerosene and light mineral oils, chlorinated hydrocarbons ι, ζ <3 _ο carbon tetrachloride perchlorethylene and trichlorethylene _o Ge Eiische of different liquids are often suitable ''

Agricultural agents are often prepared in concentrated form which is subsequently diluted by the consumer before application. "The presence of small amounts of a carrier which is a surfactant facilitates this process of dilution." Thus, preferably at least one carrier is in the composition of the invention a surface-active agent "For example, the agent may contain at least two carriers, at least one of which is a surface-active agent."

A surfactant may be an emulsifier, a dispersant or a wetting agent; it can be nonionic or ionic. Examples of suitable surfactants include the sodium or calcium salts of polyacrylic acids and lignosulfonic acids, the condensation products. of fatty acids or aliphatic amines or amides containing at least 12 carbon atoms in the molecule, with ethylene oxide and / or propylene oxide; Fatty acid esters of glycerine,

225703

bit, sucrose or pentaerythritol? Condensates of these substances with ethylene oxide and / or propylene oxide; Condensation products of fatty alcohols or alkylphenols, e.g. p ~ octylphenol or p-octyl cresol with ethylene oxide and / or propylene oxide; Sulfates or sulfonates of these condensation products} alkali or alkaline earth salts, preferably sodium salts, of sulfuric or sulfonic acid esters containing at least 10 carbon atoms in the molecule, e.g. Sodium lauryl sulfate, sodium sec-alkyl sulfates, sodium salts, sulfonated castor oil and sodium alkylaryl sulfonates such as sodium dodecylbenzenesulfohate and polymers, of ethylene oxide and copolymers of ethylene oxide and propylene oxide. ,

The agents according to the invention can be used, for example as. wettable powders, dusts, granules, solutions, emulsifiable concentrates, emulsions, suspension concentrates and aerosols. Wettable powders contain the usual manner 25 »50 and 75 wt% _o ~ active ingredient and usual manner in addition to solid inert carrier, 3 to 10 wt .-% of a dispersant and if necessary, 0 to 10 percent,"% stabilizer (s) and / or other Additives such as penetrates or adhesives. Dusts are usually prepared as rod concentrates having a composition similar to that of a wettable powder but without a dispersing agent and are diluted in the field with other solid carriers to an average of from 0.5 to 10% by weight of active compound , Granules are prepared the usual way so that they have a grain size from 0.152 to 1.676 mm and may be manufactured by agglomeration or impregnation "Generally, granules contain 0.5 to 25 wt .-% of active ingredient and 0 to 10 wt _o -% of additives such as stabilizers, slow release modifiers, and binders. Emulsifiable concentrates contain conventional

_fi 22 5 7 09

se in addition to a solvent and, if necessary Oolösangs- by 10 to 50% (w _o / v <>) active ingredient 2 to 20% (w _e / Voio) emulsifiers and 0 to 20% (w _e / v ">) other additives such as stabilizers, Penetratien and Korosionshemme, suspension concentrates are customary manner so composed as to obtain a stable non-sedimenting flowable product and usually contain, 10 to 75 percent by _e -% of active ingredient, 0j5, 0.1 to 10 percent to 15 GeWo-% dispersant ' _O ~% suspending agents such as soot colloids and thixotropic agents, 0 to 10 GeWc% of other additives such as antifoaming agents, corrosion inhibitors, stabilizers, penetrants and tackifiers and water or an organic liquid in which the active substance is substantially insoluble? certain organic solids or inorganic salts may be dissolved in the composition to help prevent settling or as antifreeze for water, *

Aqueous dispersions and emulsions ζ, Β, compositions which are obtained by diluting a wettable powder or a concentrate according to the invention with water, are also within the scope of the invention. The emulsions may be in the form of a water-in-oil. - or an oil-in-water emulsion and have a thick mayonnaise-like consistency ©

The inventive compositions may contain other ingredients, for "B _ö other compounds having insecticidal or fungicidal properties. stores included *

Examples of execution;

The invention is further illustrated by the following examples ©.

-7 ~ 22 5 7 09

example 1

Preparation of 3 ~ (3-methyl-4-isopropylphenyl) -1,1-dimethylhydric acid

7 »4- g of 3-methyl'-4-isopropylaniline and 0.5 S anhydrous sodium acetate were stirred together as a solid mixture and 5.4 g of dimethylcarbamoyl chloride were added over 15 minutes. The mixture was allowed to stand at room temperature overnight, then treated with water and then extracted with methylene chloride. After drying over magnesium sulfate, the solvent was evaporated and the resulting solid was recrystallized from a mixture of hexane and toluene. 3 g of the desired product were obtained, mp 153-1554 °.

Analysis c HN

calculated for O ₁ -> H ₂₀ N ₂ O 70.9 9.1 12.7

found 69.9 9 »1 12.1

Example 2

Alternative process for the preparation of the compound according to the invention

5 g of 3-methyl-4-isopropylaniline (80 % pure) in 150 ml of toluene was heated to reflux while GOOl ₂ -GaS was passed through the solution for approximately 1.5 hours and then dry nitrogen gas to remove excess COCl ₂ O After After cooling to room temperature, 5 g of diethylamine in 20 ml of toluene were added to the reaction mixture. The toluene was evaporated, hexane was added to the residue, and the precipitate, '5.5 g of the desired product, was filtered off. After recrystallization from a mixture of hexane and toluene, the desired product had a melting point of

Example 3

This example shows the preparation of the starting substance 3-methyl-4 ~> isopropylaniline *

186 g of 3-methylaniline warden in 600 ml of sulfuric acid (85 GeWc-%) dissolved The mixture was heated to 80 ⁰ G and 120 g of isopropyl alcohol added, the mixture was for 6 hours at 80 ⁰ G stirred After this time the mixture was poured on ice and ammonium hydroxide was added until the mixture was neutral _e Then diethyl ether was added and the ether extract evaporated "the residue was distilled to give 110 g of the desired product, bp 1OO ° C at a pressure of 3 mbar $ 25 <,

Selective herbicides efficacy of the compounds of the invention

Comparative experiment a.)

In this experiment, the selective herbicidal activity of 3- (3-methyl-4-isopropylphenyl) -1,1-dimethylurea in Y / eizen was compared to that of the commercial wheat herbicide isoproturon, 3- (4-isopropylphenyl) -1,1- dimethyi-urea © The trials before emergence were made on wheat Triticum vulgar variety Sappo, and the trials after emergence at Varietaei? Maris Huntsman performed "The examined weeds species were common couch grass, Agropyron repens (Go) ι wild oats, Avena fatua / ludoviciana (Wo); Ray «grass ,. Lolium multiflorum (Rg)? Annual bluegrass, Poa annua (Pa)? Ostrichgrass _s Agrostis tenuis (Bt); Bulrush, Alopecurus myosuroides (Am)? Hawthorn ₅ Apera spica venti (Wg); Chickweed _s Stellaria media (St); Honorary Award, Veronica persica (Sw); Catchweed Galium aparine (Gg); Knotweed, Polygo «

-9- 225 7 09

num. lapathifolium (Pp); red nettle, Lamium purpureum (Dn); Ackersenf, Sinapis arvensis (Ck); Chamomile, Matricaria spp (Mw); Shepherd's purse, Oapsella bursa pastoris (Sp); ' Poppy, Papaver rhoeas (Po) ₀

The active compounds to be tested were prepared as emulsifiable concentrates containing 20% by weight of active compound, 10% by weight of mineral oil, emulsifiers and xylene as solvent. Diluted with water and. the test plants were sprayed with amounts of 6.0, 2p, 0.6, 0.2, 0.06 and 0.02 kg / ha of active ingredient. Four repetitions were made at each dose and both pre-emergence and post-emergence tests carried out. In the pre-emergence trials, untreated soil in which the seeds were found and in the untreated soil trials in which seedlings were present were used as a comparison _o After 21 days in the postemergence trial and For 28 days, in the pre-emergence test, the effect of the active ingredients was visually rated according to a 0 to 9 scale; a rating of 0 indicates growth as in the untreated comparison, and a rating of one level increase on the linear scale corresponds to an approximately 10% increase in potency.

The results obtained were subjected to a probit analysis, whereby a computer calculates the parameters a and b in a relationship of the form: probit (percentage response) = a + b log (dose).

With the aid of the corresponding curve, the respective doses can be calculated for a specific response. In the-

~ 22 5 7 09

Example became a GID ₁ -Q value _? d _e h * the dose ₉ required to produce a 50% response to the active ingredient ^ calculated for each species «»

From the obtained fourths, a selectivity factor was calculated for each weed compared to wheat?

_n wheat selectivity factor

weed

The greater the selectivity factor, the more selective the herbicide is

Finally, the ratio of selectivity factor for the compound of the invention to the selectivity factor for isoproturon was calculated. A value greater than 1 indicates that the compound of the invention is more selective than Isoproturon®. The results are shown in Table I where the compound of the invention is designated A and isoproturon is referred to as I _o

Table I

Plant experiments before emergence

Selectivity ratio

GID

Attempts after emergence

Selective ratio

50

factor I A

the selectivity factors

50 tätsfaktor

AIA

selectivity factors

wheat

1.23 1.67 -

1,69 .1,67 -

Co 1.99 1.05 0.6 1.6 2.7 Where 0.60 0.59 2.1 2.8 1.3 rg 0.07 0.16 17.6 9.3 0 5 Pa 0.06 0.08 20.5 20.9 1.0 bt 0.02 0.02 61.5 83.5 1.4 At the 0.10 0.18 12.3 9.3 0.8 wg _ " - - - St 0.11 0.14 11.2 11.9 1.1 Sw · 0.48 0.18 2 ', 6 9.3 3.6 gg 1.87 0.91 0.7 1.8 2.6 pp 0.37 0.24 3.3 7.0 2.1 dn 0.15 0.19 8.2 16.7 2.0 ck 0.17 7.2 20.9 2.9 mw MN " _ sp - - - po * " PM ·

0.93 0.14 0.16 0.05 0.08 0.04 0.04 0.08 1.10 2.42

0.011

0.001

0.61 1.81 0.19 12.1 0.21 10.6 0.03 33.8 0.02 21.1 0.06 42.3 0.07 42.3 0.06 21.1 0, 27 1.5 0.46 0.7 0.07 6.8 0.18 4.1 0.006 96.7 0.5 14.1 0.0 $ 5 14.2 0.001 -

2.7 8.8 8.0

55.7 83.5 27.8

23.9 27.8 6.2 3.6 3.6 9.3 176.2 33.4 105.7

, 5

0.7 0.8

1.7

4.0

0.7 0.6

1.3 4.0 5.2 3.5 2.3 1.8 2.4 75

Average

1.8 2.5

R 7 fi O

The following is shown in Table I5

1 * The compound according to the invention is more sensitive to 9 and 12 before emergence and to weed species examined 11 and 15 after emergence

2 ₀ The compound of the invention is much more effective than isoproturon over commercially important weeds _? like Quecke (a perennial grass weed ) ₉ Catchstraw and honorary prize ,,

The compound according to the invention is on average 1.8 times as selective as isoproturon when applied before emergence, and 2 _f 5 as selectively as isoproturon upon application after emergence

A second experiment was conducted in which the selective herbicidal activity of 3- (3-methyl-4-isopropylphenyl) -1,1-dimethylhydric acid was compared with two other commercial urea herbicides, namely 3v (3-chloro -4-i! Ieth- »oxyphenyl) -1,1v ^ dimethylurea (chlorotoluron) and 3- (3-chloro-4-methylphenyl) -1,1-dimethylhydrogen (metoxuron) The procedure used in this pre-emergence test was the same as in Comparative Experiment a) for the pre-emergence test described with the modifications given below. The weed species studied were: Common Wheatgrass, Agropyron repens (Go)? Flight oats, Avenafatura / Ludoviciana (Where)} Raygras, Lolium multiflorum (Rg)? one-year panicle- »graSj Poa annua (Pa); woolly. Honeygrass, Holcus! Anatas (Yo); ' Bulrush ₉ Alopecurus myosuroides (Am)? Sugar beet, Beta vulgaris

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(Sb) {chickweed, Stellaria media (St); Honorary Award, Veronica persica (Sw); Field winds, Convolvulus arvensis (Gv); Knotweed, Polygonum lapathiofolium (Pp); Ackersenf, Sinapis arvensis (Ck) ₀ In this experiment, the results of the treatment were visually estimated after 20 days, and these experimental results were converted to the selectivity factors as indicated above in Comparative Experiment a), except that in this case chlorotoluron was the standard was applied. That is, the selectivity factor obtained for the two compounds to be tested for each weed species was respectively divided by the chlorotoluron selectivity factor, and the ratio for oleorotoluron was then set to be equal to 1. The results are shown in Table II where. Compound of the invention is referred to as A, chlorotoluron as C and metoxuron as M is ₀

Table II

Plants «GID art C. M

50

Selectivity factor Ratio of the selectivity factors G M AC MA

wheat

2,11 1,54 2,13

Co 1 * 71 Where 1 * 58 rg 0.51 Pa 0.19 xo 0 ^ 19 At the . 0.33 sb O ₅ 54 St 0.03 sw 0.45 Cu 0 _? 25 pp 1.28 ck 0.67

3.23 1 _p 36 1.23 0.48 1.57 1.00 Ö, 39 63 1.28 0.82 0.58 1.34 1.88 3.67 1.00 1, 40 73 2 s 74 0.49 0 _$ 44 4 ₉ 14 3.14 4.84 1.00 0 -76 28 1.17 0.22 0.11 11.11 7.00 19.36 1.00 0 86 1.74 0.19 0.14 11.11 8.11 15.21 1.00 O ₅ 73 1.37 0.87 0.26 6 _p 39 1.77 8.19 1.00 O, 13 1.28 0.46 0.17 .3,91 3.35 12 _? 53 , 1.00 0 22 • 3 _? 2O 0.03 0.03 7O ₉ 33 51.33 71.00 1 _s 00 O* 46 1.01 0.29 O ₉ 19 4 ₉ 69 5.31 11, 21 1 ₅ 00 1, 04 2.39 0j15 4.48 8.44 10.27 0.48 1.00 1, 12:06 0 _f 64 O ₅ 90 1.65 2:41 2.37 1.00 1, 1.44 0 _s 24 0.10 3.15 6.12 21.30 1.00 2, 6.76

Average

1.00 0.97

2 ₅ 04

22 5 7 09

As shown in Table II, the compound of the invention is on average more than 2 times as selective as either. Ghlorotoluron or Metoxuron when applied to wheat before emergence «

example p

Field evaluation of 3- (3-methyl-4-isopropaphenyl) -1,1-dimethylurea

The effectiveness and the spectrum of action of 3- (3-methyl-4-isopropylphenyl) -1,1-dimethylurea after emergence was compared with that of 3- (4-isopropylphenyl) -1,1-dimethylurea (isoproturon) in A total of 7 field trials were compared to winter cereals in the UK · The trials were carried out in fields of normal commercial winter wheat and winter barley in which naturally occurring grass weeds and / or weedy weeds were present.

The preparations of the compound according to the invention in the form of a suspension concentrate containing 500 g / l and of isoproturon containing 50 g / l SC (Hytan 500 L) were diluted with water and in each case in a comparable amount of four. Cans applied for each experiment. There were doses of 1.58, 2.10, 2.63, 4.2 active ingredient per hectare corresponding to the 3/4, 1, 1/4 and 2 times the commercially recommended dose of 2.1 kg, respectively / am / ha Isoproturon applied as post-emergence herbicide to winter cereals in spring * In three experiments (5, 6 and 7), the compound according to the invention was applied with the addition of a spraying aid in order to improve the properties of the composition. The spraying assistant was applied in the form of a mixture with the compound according to the invention in the tank in a ratio of 2 parts of compound ( _e ) to 1 part of spraying aid on the basis of weight /% * ".

2K * 7

Areas of 10 by 3 m were applied and each treatment was carried out 3 times in different randomized blocks. The means were applied to each area by means of a gas pressure spray device. For small areas spraying a volume of 417 l / ha with regard to the state of development of the crops and the conditions of application in each experiment are given in Table III,

The evaluation of the health of the crops and the effectiveness of the chemical treatments on grasses and broadleaf weeds was carried out one to three months after the treatment. The effects on the crops were carried out visually in accordance with the EEA 1-9 scale, where the value 0 had no effect and the Value 9 means plant dying off. The evaluation of weeds included the estimation of the percentage coverage of broadleaf weeds as a whole and of species of predominant weeds that were found in all test pieces. The grass weeds were evaluated by counting the panicles in 6 or 8 equal areas of 0.5 m * and conversion of these values into numbers for the individual flowers 0.5 m in each area »The weed species studied were: a) broad-leaved weeds - Ehrenpreis, Veronica persica (Sw)? Vogelmire, Stellari ^ media (St) 5 Chamomile, Matricaria spp «, (Mw)? Catchstraw, Galium aparine (Gg)? Red (Deadnettle, Laniinium purpure a (Dn); and b) Grass weeds - Bulrush, Alopecrus myrosuroides (Am); Wild oat, Avena spp _e (Where) ₀ Depending on the climatic conditions, the crops were harvested 138 to 169 days after treatment using a combination harvester and the grain weight of the crops determined,

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The results of the field trials are given in the following Table IV »The values given are mean values for the effects investigated in the various field trials, ie. h ₉ from the results for the different field trials was calculated in each case the agent. The declared effect on the crops is the mean on the EWRC scale by visual assessment in 7 trials. "The values given for the activity against weeds refer to the percentage reduction in weed growth compared to the comparison ranges according to the methods given above. Efficacy values against all broadleaf weed species in the trial are also reported and this mean for all weed species in this experiment is reported, under the heading "total dicotylidones" as a percentage reduction in plant growth over the control. The weight of the crops is given as the percentage value of the harvest weight of the comparison fields, which was set at 100 % o

Table III

Trial ITutzpflan- Variety Sowing- Aufbri- Development- Tempera- Feuch- Humid- Tonge-

date. dysfunctional struc- ture at the activity level

(Year ago the Aufsetzungsquiva- of Bo-

her) plants _n content lent dens

Development status

A-5 unfolded leaves (seedlings)

B-.5 unfolded leaves (seedling)

C-7 unfolded leaves (seedling)

D- main shoot and 2 stalks (stalk stage)

E- main shoot and 3 stalks (stalk stage)

F- main shoot and 4 stalks (stalk stage)

G-P _s eudo-Stengelauf direction (Stemverlängerungsstadium)

1 winter wheat Sports man 26 _e Sept. 26 _e March ⁰ _? E ' 10.7 ° 27.1. 26.0 34 2 W.Gerste soy 10 _e ect _e 28.Febr _e A 6 °. 28.1 23.5 29. 3. WoWeizen M, Hobbit 3 March A 5 ° 28 _S 3 31.2 44 4 .. winter wheat Hustler 17.03Et. 3oMärz A , D 4.5 ° 22.3 33 * 5 41 5 winter wheat Flanders October 3rd of April A 9.9 ° 38.6 36.1 52 .6 WoWeizen Flanders 11.Okt. 3rd of April C 10.0 ° 18.6 16.9 18 7 W "wheat Mitob bit 18.0kt. 3rd of April B 10.0 ° 16.1 16.8 16

(D

Table IY

connection

Effective-effectiveness against weeds

Dose -o- ^ Aw _& c-

^ / V-V genus grasses broadleaf weeds

am / na; _plant ^ _{11 Where Sw st}

Ewro scale

mw

Gg

, Erntege-

Total Äf *

? 5? 5r relative to the comparison

3- (3 ~ methyl-4-isopropylphenyl) -1,1-dimethy! Urea

1.58 2.2

2,10 2,3

2.63 2.2

4,20 2,4

3 (3-isopropylphenyl) 1.58 2.2

-1,1-dimethyl-2,10 "2,1

fabric 2.63 2.0

4,20 2,2

comparison

2.6

79.1 19.4 75.3 95.3 93.4 56.0 65.2 82.2 129.9

87.2 27.6 80.2 95.5 94.1 70.6 53.8 85.0 138.8

93.2 33.0 85.5 98.9 94.5 67.0 66.8 90.1 141.8 97.7 53.2 89.7 99.6 98.0 92.8 77.3 94.4 136 ,1

85.9 21.7 45.1 96.2 95.1 8.0 49.8 70.1 134.8

90.3 34.0 50.0 97.6 99.2 2.5 43.4 72.9 136.6 93.5 36.1 43.6 98.8 100.0 20.3 45.5 73.4 130 , 1 97.9 ^ 8.9 52.9 99.8 87.7 21.0 72.0 78.7 134.5

For this 1 page formulas

2 5 7 03

CH _:

C ₃ H ₇

NH-CO-N (CHJ

'Λ (I)

Claims (1)

7 Π Q 1 _O Herbicidal agent, characterized in that, in addition to suitable excipients and carriers, it contains, as active ingredient, a compound of the formula I, 3- (3-methyl-4-isopropylphenyl) -I, 1-dimethoxyurea. 2 ₀ Composition according to item 1, characterized in that it contains at least two excipients, at least one of which is a surfactant, 3e Agent according to item 1, characterized in that it additionally contains one or more of the herbicides 2- (4-chloro-6-ethylamine-s-triazine-2-ylamino) -2-methyl-propionitrile, ethyl-N-benzyl -N ~ (3j-dichlorophenyl) -2-aminopropionate or the racemic mixture or (-) isomer of isopropyl- or methyl-N-benzoyl-N4-3-chloro-4-fluorophenyl) -2-arijinopropionate. 4 _e procedure zlu? Controlling the growth of unwanted plants in one place, characterized by applying to the site a compound according to items 1 to 3 or 3- (3-methyl-4-isopropylphenyl) -1,1-dimethylurea, 5o Use of 3-C3-methyl-4-isopropylphenyl) -1- _T 1-dimethylurea as herbicide