LT3009B - Method for spray tank cleanout - Google Patents

Abstract

A method for facilitating cleanout of residual sulfonylurea pesticide from spray tank equipment comprising (i) formulating the sulfonylurea as an agriculturally suitable water-soluble salt composition before spray tank application, (ii) applying the salt composition to the crop and (iii) rinsing the tank substantially free of residual sulfonylurea more easily than is possible when the sulfonylurea is not formulated as a salt.

Description

Sulfonylureas, as a class, are very active pesticides. Therefore, it is important to make sure that all traces of the sulfonylurea have been cleaned from the reservoir of the sprayer installation (hereafter referred to as the sprayer) used for crop spraying, prior to the application of crop susceptible to or susceptible to Properly ·. .cleaning can be done by flushing but · it takes time and problems of environmental water contamination occur. '· ../. ·', · '- ·. ·' '' '

Sulfonylurea salts and their extensions are known in the art. So far, the benefits, which

... can. be achieved by cleaning the sprayer tank when .15 'is used, a sulfonylurea active additive. contains salts, o. in non-acid form .. the salt mixtures described may; be applied by conventional means or by chemical injection technology where:. soluble • h ·. / mixture ’· forms a solution which may be. immediately injected into the sprayer mast. ¹ 'h This'<invention concerns a method designed to reduce pollution h sulfonylurea pesticide remaining in the spray, which' was used to sulfonylurea,; in the reservoir. There are the following steps of the method:. · /, ·.

i) prior to use in the spray tank 'tank, a formulation of an agricultural-friendly' water-soluble sulfonyl urea salt is prepared, thereby increasing the solubility of the sulfonyl urea and reducing the residual spray tank contamination with the present amount of insoluble sulfonyl urea; crops to minimize accumulation in the insoluble sulfonylurea spray reservoir, and, · '

² (iii) as far as practicable, the sulfonylurea residue is flushed out of the spray tank after use, and. after the operation, the sulfonyl urea residues in the nozzle reservoir are significantly lower than the amount of sulfonyl urea remaining when the latter was not converted to water-soluble salt prior to use.

Sulfonyl and their accumulation in the spray tank is reduced in the present invention in the manner described are the sulfonylurea acids. When used alone or with a reservoir viebu or more ^of a mixture ^of! '' of partners. The benefits of the present invention are further exemplified when the sulfonylurea is administered with a reservoir mixture partner. Benefit. further

15 ^: Occurs when previous tank mixes leave organic deposits on the inner surfaces of the spray tank. In this case, it is likely that those insoluble sulfonylurea particles are deposited on the organic sediment. and · remains in the sprayer tank. not suspended in water

-ir. undissolved. Therefore, after use of the spray tank, the crop susceptible to sulfonylurea is damaged either by introduction into the tank water, particles from the previously deposited organic sediment, or by decomposition of the organic sediment containing sulfonylurea particles.

The problem of cleaning the sprayer tank is exacerbated by the use of relatively high concentrations of sulfonylureas. Because the solubility of the active ingredient of the sulfonylurea in its Acidic form is relatively low in water, the reservoir mixtures of the sulfonylureas are initially in suspension. Suspended particles may collect along the walls of the reservoir, in the pipeline, or may scrub from the -organic sediment inside the reservoir. If the latter reservoir mixture is transferred lfon ii urea to a-r suspension, the susceptible plants may be injured.

• ³

This problem is overcome by using water-soluble forms of sulfonylureas. Sulfonylurea salt · soluble more rapidly than its corresponding sulfonylurea form, this is particularly evident.

to lower pK. Thus, for typical use, there should be little or no accumulation of sulfonylurea particles on the inner surface of the reservoir, or on the organic sediment that may have formed on such surfaces. Use in the form of a salt of a sulfonylurea relative to. their 'acid form, in various' circumstances ^ improved cleaning of the sprayer tank more than four times.

Preferred salt cations (M) include sodium, '15 potassium, calcium, magnesium, ammonium and alkylammonium cations.

The preferred sulfonylurea salts are tribenuron methyl sodium and. calcium salts, trifensulfuron methyl-calcium salt, chlorosulfuron ammonium salt, and metsulfuron methyl potassium salt. .

. i./'./ '' to 's /' to? j • '/.' 'to-'. ',.'. j

In the drawings we can see graphical 'comparisons of the data summed up; in tables .. In drawing no. 1 see a statistically significant difference between purge? severity of sulfonylurea reservoir partner mixtures (37% failure) and purification of the corresponding sulfonylurea salt-reservoir partner mixtures (89% failure). In drawing no. 2, we see an even greater difference in the absence of reservoir partners (89% failure cases for sulfonylurea acid and 11% failure cases for salt mixtures).

The use of the sulfonylureas whose salt form is contemplated in the present invention has the formula:

... • which:

r -, ;; J. selected from the groups:

ilr2. . ilnS.

ilnS

J-10 J-ll

R is selected from the group consisting of H and CH ₃ ;

'1.

R ^{1 is} selected from the group consisting of F _r Cl, Br, NO ₂ , C ₃ -C ₄ alkyl, and. C ₁ -C ₄ haloalkyl, C ₃ -C ₄ cycloalkyl, C ₂ -C ₄ / haloalkenyl, C - C ₄ alkoxy, Cj-C ₄ haloalkoxy, C ₂ -C ₄ alkoxyalkoxy, CO ₂ ^{R! 2} ·:. C (O) NR ¹³ R ¹⁴ , SO ² NR ¹⁵ R ¹⁶ , S (O) n R ¹⁷ , C (O) R ¹⁸ , CH ₂ CN,.

·. ..and i, '

R ^{2 is} selected from the group consisting of H, F, Cl, Br, CN; CH ₃ , OCH ₃ ,, •. '·. SCH ₃ , SH ₃ and OCF ₂ H; >

1.0 '' i '. / i 'i? · .. ··' vji 10't. .1 j; R ^{3 is} selected from Cl, NO ₂ , CO ₂ CH ₃ , CO ₂ CH ₂ CH ₃ ,

.. · to SO ₂ N (CH ₃ ) ₂ , SO ₂ CH ₃ , SO ' ₂ CH ₂ CH ₃ , GCH ₃ and OCH ₂ CH ₃ ;

; R ⁴ /. selected from B ₁ -C 1-4 alkyl, B ₁ -C ₂ to 15 haloalkyl, C ₁ -C ₂ alkoxy, C ₂ -C ₄ .

. . halogenalkenyl, F, Cl, Br, NO ₂ , CO ₂ R ¹² , C (O) NR ³³ R ¹⁴ , SO ₂ NR ¹⁵ R ^ie , S (O) „R ¹⁷ , C (O) R ⁸ · ⁸ and L ; ·. 'j'.g; B.

R ⁵ . selected from the group consisting of H, F, Cl, Br and Crl .; to i 'i ^; V ... /: iti. ' / g. ' R ^{6 is} selected from C ₁ -C ₃ alkyl, C ₁ -C ₂ alkoxy, C ₂ -C ₂ , haloalkenyl, F, Cl, Br, CO ₂ R ¹² ,

C (O) NR ^{'! 3} R ^14, SO 2 NR R ^{i5 IFI,} S (O) RR ^17, C (O) R', and L · ^8.

• 25: R ⁷ . selected from the group consisting of H, F, Cl, CH ₃ and CF ₃ ;

R ^{8 is} selected from the group consisting of H, C ₁ -C ₃ alkyl and pyridyl;

R ⁹ . . selected from C ₁ -C ₃ alkyl, C ₁ -C ₂ alkoxy, F,

Cl, Br, NO ₂ , CO ₂ R ¹² , SO ₂ NR ¹⁵ R ¹⁶ , S (O) n R ¹⁷ , OCF ₂ H

C (O) R ^ls f C ₂ -C ₄ haloalkenyl and L.

. ·> ·.

.R ^{10 is} selected from the group consisting of H, Cl, F, Br, t _i ~ C ₃ alkyl and. C ₁ -C ₂ alkoxy; . - ₀ . '1 .. ··.' v? '' · '.. .'i't.f

R ¹¹ 'is selected from the group consisting of H, C ₁ -C ₃ alkyl; alkoxy,

C ₂ -C ₄ haloalkenyl, F, Cl, · Br, CO ₂ R ¹² ,

C (O) NR ¹³ R ^14, SO 2 NR ¹⁵ R ^16, S (O) ^{n; 7} C (O) R ^i3, and L; i

R ¹² from the group -atrinkta and Aulos. propargyl 'and C _X -: Č ₃

- alkyl optionally substituted with at least one member; «. ·. ·· independently selected from halogen, C _r -C ₂ alkoxy and CN; _: b. ... · '> ·. .

R ¹³ is selected from the group H, C 1 ^- 3 alkyl and C ₁ -C ₂ alkoxy; '·'

R ¹⁴ is C ₁ -C ₂ alkyl;

R ^{1b is} selected from the group consisting of H, C 1 -C 6 alkyl, C 1 -C 6 alkoxy, 'allyl and acyclopropyl; ,. '.

R ^{16 is} selected from the group consisting of H and C-C ₃ alkyl; '<

R ^;? selected from the group C, -C ₃ alkyl, C ₁ C _3.

haloalkyl, allyl and propargyl;

R ¹⁸ is selected from the group C 3 -C ¹ -C 3 alkyl, C 1 -C _i haloalkyl and C ₃ -C ₃ cycloalkyl, optionally substituted by halogen;

n 'is 0,1 or 2;

M. is a cation;

L is

i · i,

Rj w

X is selected from the group consisting of H and C 1 -C ₃ alkyl; selected from the group consisting of O and S; .

selected from the group H, (Cu · s-alkyl, C, -C ₄ C! -C ₄ haloalkoxy, C ₁ -C ₄ haloalkyl, alkoxy, C _r C ₄ · halogenalkiltic C.-C ₄ alkylthio, halo, C ₂ -C ₅ alkoxyalkyl, C ₂ -C ₅ alkoxyalkoxy, amino, C ₁ -C ₃ alkylamino and di (C ₁ -C ₃ alkyl) amino;

Y · is selected from H, C ₁ -C ₄ alkyl, C 1 -C ₄ alkoxy, C ₁ -C ₄ haloalkoxy, alkylthio, haloalkylthio, C ₂ -C ₅ alkoxyalkyl. C ₂ -C ₅ alkoxyalkoxy, amino, C ₁ -C ₃ alkylamino and id (C ₁ -C ₃ alkyl) amino, C ₃ -C ₄ alkenyloxy, C ₃ -C ₄ alkynyloxy,

C ₂ -C ₅ alkylthioalkyl, C ₂ -C ₅ alkylsulfinylalkyl, ·:

. C ₂ -C ₅ alkylsulfonylalkyl, C ₁ -C ₄ haloalkyl, C ₂ C ₄ alkynyl, C ₃ -C ₅ cycloalkyl, azido and cyano.

• Z is selected from the group consisting of CH and N;

'//../.'.It i ..

anticipating that .. '?

i) when one of X and Y is C _: haloalkoxy, then Z is CH; and 'k'. · I <

ii) when X.-is halogen, then Z is CH and. Y is OCH ₃ , OCH ₂ CH ₃ , N (OCH ₃ ) CH ₃ , NHCH ₃ , N (CH ₃ ) _2, and OCF.

The salts of the following sulfonylureas are preferred over the following processes: 2-chloro-N - [['(4-methoxy-6-methyl-1,3,5-triazin-2-ii) amino] carbonyl] benzosulfonamide (chlorosulfuron); methyl 2 - [[[[(4,6-dimethyl-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl] benzoate (sulfometuron methyl); ethyl 2 - [[[. [(4-Chloro-630-methoxy-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl] - <

benzoate (chlorimuronethyl); methyl 2 - [[[(4-methoxy-6-methyl-1,3,5-triazin-2-yl) 'amino] carbonyl] amino] sulfonyl] benzoate (metsulfuronmethyl); 'Methyl 2 - [[[[(4,6-dimethoxy-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl] 35 6- (trifluoromethyl) 73-pyridinocarboxylate; methyl 2 [[[[[4-ethoxy-6- (methylamino) -1,3,5-triazin-2-yl] amino] carbonyl] amino] sulfonyl] benzoate '(ethametsulfuron methyl); , 2- (2-chloroethoxy) -N - [[(4-methoxy-6-methyl-

ethyl {: (4 :, 6-dimethoxy-2-pyrimidinyl) amino] carbonyl] amino] sulfonyl] -1-methyl-1H-pyrazole-4-carboxylate; ΝΕΕ 4,6-Dimethoxy-2-pyrimidinyl) amino] carbonyl] -3- (ethylsulfonyl) -2-pyridine sulfonamide. (rimsulfuron), methyl 3 - [[[[((4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino] · carbonyl] amino] sulfonyl] -2-thiophenecarboxylate ( thifen ^: sulfuron-methyl) methyl 2 - [[[[N, (4-methoxy-6-methyl, 3,5-triazin-2-yl) -N-methylamino] carbonyl] amino] sulfonyl] benzoate (tribenuron methyl ); 10 methyl 2 - [[[[[(4,6-dimethoxy-2-pyrimidinyl) amino]]

-u carbonyl] -amino] silylphonyl] -methyl] benzoate ^: (benzenesulfuron-methyl); 2 - [[[[(4,6-Dimethoxy-2-pyrimidinyl) amino] carbonyl] -amino] sulfonyl] -N, N-dimethyl-3 · pyridinecarboxylic acid (nicosulfuron); methyl 2 - [[[[4,6,615 bis (dufluoromethoxy) -2-pyrimidinyl] dmino] carbonyl] amino] sulfonyl] benzoate; methyl 2 - [[[[(4-dimethylamino) -6- (2,2,2-trifluoroethoxy) -1,3,5-triazin-2-yl] amino] carbonyl] amino] sulfonyl] -3-methyl. l-benzoate; and N - [[(4,6-dimethoxy-2-pyrimidinyl) amino] carbonyl] -120 methyl-4- (2-methyl-2H-tetrazol-5-yl) -1H-pyrazolo-5-sulfonamide. * ';''- ···

Even more preferred are the sulfonylureas salts of the following sulfonylureas: 3 ~ [[[E (4-methoxy-6-methyl-1,3,3,825-triazin-2-yl) amino] carbonyl] amino] sulfonyl] -2-thiophenecarboxylate (thiophene) .sulfuron methyl), methyl 2 [EEE (4-methoxy-6-methyl-1,3,5-triazin-2-yl) amino] carbonyl] amino] sulfonyl] benzoate (metsulfuron methyl), methyl 2 - [[[ [N- (4-methoxy-6-methyl-1,3,5-triazin-2-yl) -N 30 -methylamino] talcyl] amino] sulfonyl] benzoate · (tribenuron methyl) 'and 2-chloro-N- [[ (4-Methoxy-6-methyl-1,3,5-triazin-2-yl) amino] carbonyl] benzenesulfonamide (chlorosulfyron), wherein M is selected from the group consisting of sodium, potassium, calcium, ammonium and alkylammonium.

'f /. '_{; :} '' f

Sulfonylurea salts described herein. In the present invention, they may be used alone or in combination with other commercial herbicides '' '(including »' other insecticides or fungicides. Mixtures containing sulfonylurea salts are particularly useful in minimizing spray tank cleaning when compared to the same mixtures containing the corresponding mixtures. sulfonylurea.

The data summarized in Table 1 · (using Protocol 1) show that the sulfonylureas, together with. reservoir mixture partner, the failure rate was 37% (10 failed cases out of 27) with the corresponding sulfonylurea alkali metal salt only having a negative action level of approximately 8% (2 failed cases out of 24). (NOTE: The test failure corresponds to the greenhouse result of more than 20% loss of sugar beet in the bioassay test.) The data summarized in Table II (using Protocol II) show that in the absence of a reservoir partner, purification of the sulfonylurea salt mixture is equivalent. or more effective than purification of the corresponding sulfonylurea. The respective reservoir purification protocols I and II are after each table, followed by a bioassay protocol. Each figure for the percentage of damage in the tables is the result of two biological tests where there were two samples of the final ammonia flush .water from the nozzle.

TABLE I. Sprayer Cleaning, ·

Sulfonylcarbamide'mide and reservoir mixture partner

Sulfonylurea Initial Reservoir Injury * sulfonyl of the mixture percent urea. partner it concentric • 'no and reservoir in the mixture 'iPPm)

Tifensulfuron methyl

Tifensulfuron Methyl + Metsulfuron Methyl (10: 1)

Tifensulfuron + Tribenuron. methyl (2: 1)

Tribenuron throws in!

400 ' 2,4-D 60 400 MCPA 100 500 propiconazole 90 190 propiconazole · 0 380 propiconazole 100 600 propiconazole 0 600 propiconazole 20 ' 600 propiconazole 0 600 flutriafol. 70 600 flutriafoiaas 20th 600 2,4-D 0 600. 2, 4-D 0 600. 2,4-D 0 600 2,4-D 60 775 2,4-D 0 1000 2,4-D - 0 530 2,4-D / PAM ** 0 450 . MCPA ' 50 430 MCPA 0 750 MCPA 10th 750 MCPA. '0 1070 mcpa ': 0 835 propiconazole 100 149 propiconazole 50

± ύ

168. propiconazole 0 200 propiconazole 0 200 propiconazole 90 Tifensulfuron 232 propiconazole • 0 methyl .. potassium salt 400 propiconazole 0 500 propiconazole • 90 400 2,4-D 0  407 flutriafol 0 570 flutriafolash 20th Tifensulfuron . '660 propiconazole 30th methyl potassium salt + 660 propiconazole 0 metsulfuron methyl (10: 1) Tifensulfuron 700 2,4-D 0 methyl > potassium salt + 700 2,4-D 0 tribenuron methyl 1150 2,4-D 5 sodium salt • 1150 2,4-D 0 (2: 1) 130 MCPA 2 675 MCPA 2 700 MCPA ⁰ 720 MCPA 0 700 propiconazole 0 770 propiconazole 0 Tribenuron methyl 117 2,4-D 0 sodium salt 200 propiconazole 0 224 propiconazole 0 246 propiconazole 2 . 268 propiconazole 0 281 propiconazole 0

* Percentage of damage to sugar beet after spraying with final ammonia wash, water after tank wash procedure.

** PAM - surfactant.

TANK CLEANING PROTOCOL I (Sulfonylurea and tank mix partner)

Phase I

Fill half the tank with water and add sulfonylurea or sulfonylurea salt while stirring. Fill 90% of the tank with water, add partners to the tank mix and finish filling the tank. Stir the tank mix for at least 5 to 10 minutes. .

Stage

Sprays the contents of the reservoir through the nozzle stem. Fully collects water from the reservoir.

Stage · '

Rinses the inner surfaces of the tank with water; uses approximately 10% of the tank capacity. Sprays this wash water through the sprayer boom. Fully collects water from the reservoir.

Stage

Fill about half the tank with fresh water and add the desired cleaning solution. Finishes filling the tank. Wash the entire interior and the jet stem with a cleaning solution (such as water, ammonium hydroxide or sodium hypochlorite solution) and stir for 15 minutes. Sprays 10 to 20 gallons of flushing water through the nozzle mast. Fully collects water from. reservoir.

StageLT 3009 B ¹³

Removes all nozzles, nozzle covers, working filters or any type of filter and thoroughly cleans the bucket with water and cleaning agent. Removes any sediment residue with the brush.

Stage

Flush the inside surfaces of the tank with fresh water; uses approximately 10% of the tank capacity to remove all traces of the cleaning solution. Sprays the wash water through the sprayer stem. .Completely draws water from tank.

Stage

Half-fill the tank and add 'ammonium hydroxide' to give a concentration of 0.3% 'ammonia. Finishes filling the tank. Washes the sprayer stem with ammonium to mix for '15 minutes, the water flushes the tank all over the interior and with the hydroxide solution and

Sample (example in biological test). Sprays from ammonia used 10 to 20.

gallons through the nozzle stem and then selects samples from the nozzle (sample used in test). Fully collects the contents of any remaining ammonium hydroxide solution from the reservoir with fresh water. Note: The samples were buffered to the appropriate pH to ensure the stability of the sulfonylurea and then stored frozen until analysis.

to the spray test residue. Washes

TO TABLE II

Spray cleaning tests

Sulfonylurea without reservoir mixture partner

LT 300!

Sulfonylurea t. Initial sulfonylurea concentration in the tank mix Injury * percent Tifensulfuron 550 m.d. 28th meti 550 m.d. 32 550 m.d. 17th Tifensulfuron methyl 550d ' 0 potassium salt 550 m.d. 0 550 m.d. 18th Chlosulfuron 275 m.d. . 50 275 m.d. 100 275 m.d. 100 275 m.d. 100 Chlorsulfuron 275 m.d. 0 ammonium salt 275 m.d. 0 275 m.d. 5 Metsulfuron methyl 275 m.d. 85 275 m.d. 100 275 m.d. 30th Metsulfuron methyl 275 m.d. 8th potassium salt 275 m.d. 0 Metsulfuron 'methyl 275 da 64

sodium * Percentage of damage to sugar beet after spraying with final ammonia rinse water after tank wash procedure, '

TANK CLEANING PROTOCOL II ((Sulfonylurea without tank partner)

Step 1

The sulfonylurea - the sample to be tested - is divided into 2 equal parts. On the one hand, it prepares a liquid mass and on the other, a paste. Apply and / or spray paste and liquid mass on the inside of the tank and leave overnight. This procedure yields dry sediment on the reservoir surfaces and mimics poor field conditions.

Stage

Flush the inside of the tank with clean water using • a volume equal to 10-20% of the tank capacity, allowing the flushing water to flow through the nozzle stem and hoses.

Stage

Fill the tank with clean water and stir for 10 minutes. Discharges water by flushing, flowing at least 1020% through sprayer stem and nozzles.

Stage

Removes all nozzles, nozzle covers and internal filters and cleans with clean water.

Stage

Flush the tank with clean water using a volume equal to 10-20% of the tank capacity. Allows the wash water to accumulate in the reservoir and is then discharged through the spray gun stem and. nozzles. Fully collects water from the reservoir.

Stage

Half-fill the tank and add ammonium hydroxide to a concentration of 0.3% ammonia. Finishes filling the tank. P_jects the entire jet and jet stem with -ammonium hydroxide solution and blends for 15 minutes. For example, ammonia water washes the reservoir (an example used in a bioassay test). Sprays 10 to 20 gallons through the nozzle stem and then selects samples at the spray nozzle (the sample used in the bioassay test). 'Fully collects residual content.

t:

Wash the remaining ammonium hydroxide solution from the reservoir with fresh water. Note: Samples were buffered to an appropriate pH to ensure stability of the sulfonylurea and then frozen before analysis.

BIOLOGICAL TEST DATA

The bioassay protocol used to determine the percentage of damage to the crop. (sugar beet), sprayed with final wash water, after cleaning the tank from the substances listed in the tables below. Sugar beet sprouts (two leaf stages) were grown in a greenhouse (14 hours photoperiod at 21 ° C with light and 10 hours at 17 ° C in the dark) and sprayed with unmodified effluent samples after various spray-washing procedures. An automatic zone sprayer 'was used and the samples used approximately 45 gal / A. Three replicate pots containing four beet sprouts were treated with each sample. Between separate tests, the sprayer was washed .12 times to make sure; there is no overlap of examples.

Plants were kept in the greenhouse until evaluation, 14 to 23 days after treatment. The injury of treated plants was evaluated visually on a scale from 0. to '100 (0 = unharmed, 100 = completely dead) compared to control plants. The injury level was based on the presence of a variety of symptoms including biomass loss, low height, inhibited development, chlorosis, necrosis, leaf blotch, and leaf wrinkling and deformation.

Mixture

The compounds of the present invention are generally used in admixture with agriculturally acceptable carriers, and may be liquid or solid. diluents or organic solvents. Mixtures may be in the form of powders, granules, pills, solutions, slab B, suspensions, emulsions, gels, in weight, wetting concentrates, dry active ingredient in a plastic powder, emulsifying fluid, and the like, environmental 10 factors such as soil type, humidity and temperature. Spray-mixes can. to be spread in a suitable medium, and the spray volumes used are from one to several hundred liters per hectare. High strength formulations are initially used as intermediates for further formulations. Mixtures generally contain an effective amount of a sulfonylurea (s), diluent and surfactant, approximately 100% below.

Weight percentages Active ingredient Thinner « PAM * Moisturizing 5-95 0-95 0-10 powder Oiled . 1-50 40-99 0-15 suspensions emulsions, solutions -(including- emulsifying concentrates) Pesticides 1-80 20-99 ' 0-15 · impregnated film Powder 1-25 70-99 0-5. . Granules 0.01-99 5-99.99 0-15 In the water 1-90 5-99 0-15 dispersible granules / pills Pills 10-60 40-9S 0-5

18th com: 1009 -B High strength 90-99 0-10 0-2 compositions Gels 1-70 0-99 0-10. Typical solid the diluents are described by Watkins et al.,

Handbook of Insecticide Dust Diluents and Carriers, -2nd Ed., Dorland Books, Caldwell, New Jersey Typical liquid diluents and solvents are described in Marsden; Solvents Guide, 2nd Ed., Interscience, New York, 1950,. McCutcheon's' Detergents · and Emulsifiers Annual, Allured Publ. Corp., Ridgewood, New Jersey, as well as Sisely and Wood, Encyclopedia of Surfaces Active Agents. Chemical Publ. Co., Ine., New York, · 1964, lists surfactants and recommended uses. All mixtures may contain minor amounts of additives which reduce foaming, sintering, corrosion, microbiological, growth and so on.

Solutions are prepared by simply mixing the ingredients. Good solid compositions are obtained by · mixing and, usually, grinding in a ball mill. or fluid energy mill. ' Water-dispersible granules may be prepared by agglomeration of a fine powder formulation; see such as. Cross et al., · Pesticide Formulations, Washington, D.C., 1988, pp. 251-259. Suspensions are prepared by wet milling; see e.g. U.S. 3,060,084. Granules and pills may be prepared by spraying the active ingredient on a ready-made granule carrier or by agglomeration techniques. See. Browning, 'Aglomeration', Chemical Engineering, December 4, 1967, pp 147-148, Perry's Chemical Engineer's Handbook, 4th Ed., McGrawrHill, New York, (1963), ^ pages 8057 'et seq., And WO 91 / 135.46. Pills can be prepared as described in U.S. 4,172,714. Water dispersible and water soluble granules can be prepared as DE 3,246,493.

For more information on ar ~ e blending, see U.S. 3,235,361, pastr. 6, line 15 to pastr. 7, line 19 inclusive and examples 10-41; U.S ·. 3,309,192, Pastr. 5, line 43 to pastr. 7, line 62 inclusive and examples 8, 12, 15, 39, 41, 52, 53, 58, 132, 138-140, 162-164, 166, 167 and 169-182; U.S. 2,891,855, Pastr. 3, line -66 to pastr. 5, line 17 inclusive and Examples 1-4; Klingman, Weed Control as a Science, John Wiley and Sons, Ine., New York, (1961),. pp. 81-96; '' And Hance et al., Weed Control Handbook, 8th Ed., Blackwell Scientific Publications, Oxford, ($ 198). ·

In the following examples, all. percentages are percentages by weight and all blends are made by conventional means. Compound 1 is an ammonium salt of chlorosulfuron.

EXAMPLE

High strength concentrate

Compound 1 98.5%

Silica Airgel 0.5%

Synthetic amorphous 1.0% fine silica

EXAMPLE B ''.

Moisturizing powder

Compound 1 '65.0% Sodium alkylnaphthalenesulphonate 2.0% Sodium lignin sulphonate 4.0% Silicoaluminium sodium 6.0% Montmorillinite (calcined) 23.0%

EXAMPLE C Granules Compound 1 10.0 atapuloito granules (low volatile 90.0

material - 0.71 / 0.30 die, U.S.S. 25-50>

EXAMPLE D

Water dispersible granules / pills

Compound 1. 25.0% anhydrous sodium sulfate '10.0% crude *' calcium lignin sulfonate 5.0% sodium alkylnaphthalenesulfonate 1.0% calcium / magnesium bentonite 59.0%

Claims (2)

DEFINITION OF INVENTION A method for reducing the residual contamination of a spray tank used for a sulfonylurea pesticide, characterized in that it consists of the following steps; . (i) Prepare an agriculturally water-soluble sulfonic acid urea salt formulation in the spray tank before use; and. thereby increasing the solubility of the sulfonylurea and reducing the residual contamination of the sprayer tank with the amount of insoluble sulfonylurea present, t (ii) the prepared sulfonylurea salt composition is used in the crop to minimize accumulation in the insoluble sulfonylurea spray reservoir; relative to the amount of residual sulfonylurea when the latter was not converted to a water-soluble salt prior to use. 2. A process according to claim 1, wherein the sulfonylurea salt in step (i):