CN1145417C - Herbicidal compositions for paddy field - Google Patents

Abstract

To obtain a herbicidal composition for a paddy field capable of effectively preventing weed in the directly sown paddy field, and preventing the weed in the paddy field by applying the composition when planting rice, while reducing a chemical injury of rice by including a specific compound and a specified herbicidal compound. This herbicidal composition for a paddy field includes (A) 2',5- dichloro-4'-nitrosalicylanilide, (B) at least one kind of compound selected from (i) herbicidal sulfonamides [e.g. methyl &alpha -(4,6-dimethoxypyrimidin-2- ylcarbamoylsulfamoyl)-o-toluate], (ii) herbicidal oxyacetamides (e.g. 2- benzothiazol-2-yloxy-N-methylacetanilide), (iii) herbicidal tetrazolines [e.g. 1-(2- chlorophenyl)-4-(N-cyclohexyl-N-ethylcarbamoyl)-5(4H)-tetrazonone]. The formulation proportions thereof are preferably 0.05-0.5 pt.wt. of component (i), 1-4 pts.wt. of component (ii) and 0.1-1 pt.wt. of component C based on 1 pt.wt. of component A.

Description

The Herbicidal combinations that is used for the rice field

The present invention relates to be used for the Herbicidal combinations in rice field.More specifically, the present invention relates to contain as 2 of active component ', 5-two chloro-4 '-Herbicidal combinations of nitro salicylanilide and certain known herbicides compounds, and the method for using their control weeds in paddy field.

For the rice crop of Japan, as known, what tradition generally adopted is the rice transplanting method.But in recent years, Ri Ben rice crop was poor in the international competitiveness that has in price.Therefore,, and consider and save the labour, plan rice crop is turned to live broadcasting method by the rice transplanting method as one of measure of production aspect.But, such problem has appearred, and promptly at control of weeds with to aspect the paddy rice injury, the weed killer herbicide that is used for the rice transplanting method not necessarily is applicable to live broadcasting method,

In addition, estimate that in Korea S and Japan, the area of direct sowing rice field in the future will increase.And different with Japan, traditionally, each national rice crop almost all adopts live broadcasting method in Southeast Asia.Therefore, strong wish development a kind of aspect controlling weeds and saving labour fabulous weed killer herbicide.

Found now not only aspect the control of weeds of direct sowing rice field, and aspect the preventing and treating of the weeds in paddy field of when rice transplanting, using, and that aspect the paddy rice injury following composition has fabulous and needed effect.

The Herbicidal combinations in these rice fields comprises and contains as active component:

(a) 2 ', 5-two chloro-4 '-the nitro salicylanilide and

(b) at least a compound that is selected from the group that constitutes by herbicidal sulfonamide class, weeding oxygen yl acetamide class and weeding Tetrazoline series.

Astoundingly, these compositions of the present invention not only can reduce the injury to paddy rice that causes when being used alone herbicides compounds outside forming component significantly, and by being administered to live rice field and, all can accurately preventing and treating weeds in paddy field by using when the rice transplanting.

In composition of the present invention, as 2 of component (a) ', 5-two chloro-4 '-the nitro salicylanilide is a kind of compound known, it is specifically open, and is for example open in US3079297.And it prevents and treats a class snail as a kind of chemicals, fresh water snail class, this class snail can be that the vector that testis is inhaled props up in the China that schistosome and sheet fluke belong to, and they colonize on the human body, and prevent and treat a kind of snail, the macula lutea snail that rice crop is caused a large amount of injuries in south east asia.

On the other hand, according to the present invention, in these compositions, the instantiation that can be used as the herbicidal sulfonamide class of component (b) comprises, for example,

α-(4; 6-dimethoxypyridin-2-base carbamoyl sulfamoyl)-o-toluic acid methyl esters, 5-(4; 6-dimethoxypyridin-2-base carbamoyl sulfamoyl)-1-methylpyrazole-4-carboxylic acid, ethyl ester, 1-(2-chloro imidazo [1; 2-a] the pyridin-3-yl sulfonyl)-3-(4; 6-dimethoxypyridin-2-yl) urea and N-(2-cyclopropyl carbonyl phenyl sulfamoyl base)-N '-(4,6-dimethoxypyridin-2-yl) urea.

For example, these compounds disclose clear 59-122488, EP-A238070, EP-A 463287 etc. at EP-A 51466, Japan Patent and described, and adopt the method for describing in these lists of references can also make these compounds.

In addition, according to the present invention, the instantiation that can be used as the weeding oxygen yl acetamide of component (b) in these compositions comprises, for example 2-[4-morpholinodithio-2-base oxygen base-N-exalgine.This compound is (EP-A 5501) of being widely known by the people in described field as weed killer herbicide.

And according to the present invention, the instantiation that can be used as the weeding Terazololine-one of component (b) in these compositions comprises, for example 1-(2-chlorophenyl)-4-(N-cyclohexyl-N-ethylamino formoxyl)-5 (4H)-tetrapyrrole quinoline ketone.This compound was described at EP-A 612735, and adopted the method for describing in this list of references can make these compounds.

The various reactive compounds of said components (b) can both use separately, or are used in combination with one or more other compounds outside this group (b).

According to the present invention, the mixing ratio of component in these compositions (a) and component (b) can be according to the phase of using, use area or application process and change in the scope of a broad, but common relative 1 part of (weight) 2 ', 5-two chloro-4 '-the nitro salicylanilide, use 0.05-0.5 part (weight), preferably 0.1-0.3 part (weight) herbicidal sulfonamide; 1-4 part (weight), preferably 2-3 part (weight) weeding oxygen yl acetamide; With 0.1-1 part (weight), 0.25-0.75 part (weight) weeding Terazololine-one preferably.

According to the present invention, these compositions are the control of weeds in direct sowing rice field and use during by rice transplanting on the control weeds in paddy field and shown fabulous effect not only, and has shown the remarkable result that paddy rice is not brought any injury.Therefore, the present invention can also provide a kind of method of preventing and treating weeds in paddy field, it is characterized in that to live rice field or described composition is used in the rice field during to rice transplanting.

According to the present invention, these compositions are used for preventing and treating the various weeds that occur in the rice field.Can mention

Example is as follows:

The dicotyledon weeds:

Polygonum, Weldering belongs to, Chinese deciduous cypress leaf belongs to, Vandellia, Bidens, The horsefly eye belongs to, The sweet wine intestines belong to, Waterwort Belong to, Gratiola, Vandellia, Ludwigia, Oenanthe, Ranunculus and damp chilly belong to

Monocotyledon weed:

Echinochloa, Panicum, Annual bluegrass belongs to, Cyperus, Monochoria, Genus fimbristylis, Arrowhead belongs to, Water chestnut Belong to, Scirpus, Waterplantain, The An Nilaimo grass belongs to, Water screening spp, Eriocaulon buergerianum and Potamogeton

According to the present invention, these compositions can be used for especially to for example following typical weeds in paddy field.

Formal name used at school (botanical name)

Broadleaf weed

Mexicana (Rotala indicaKoehne)

Procumbent Falsepimpernel (lindemia ProcumbensPhilcox)

False loosestrife (ludwigia prostrata Roxburgh)

Pondweed (Potamogeton distinctus A.Benn)

Three stamen waterworts (Elatine triandra Schk)

Chinese celery (Oenanthe javanica)

Monocotyledon weed

Barnyard grass (Echinochloa oryzicola vasing)

Monochoria vaginalis (Monochoria vaginalis Presl)

Needle spikesedge herb (Eleocharis acicularis L.)

Water Sha shape water chestnut (Eleocharis Kuroguwai Ohwi)

Abnormity nutgrass flatsedge (Cyperus difformis L.)

Herba Cyperi Glomerati Cyperus serotinus Rottboel)

Short arrowhead (Sagittaria pygmaea Miq)

Alisma canaliculatum (Alisma canaliculatumA.Br.et Bouche)

Firefly Lin (Scripus juncoides Roxburgh)

But according to the present invention, the use of these compositions is not limited to the weeds of these genus, and expands other weeds in the same way to.

According to the present invention, when these compositions are used to prevent and treat weeds in paddy field, they can be with the form of common preparation, for example very thin capsule etc. in solution, emulsion, wetting powder, suspension, pulvis, soluble powder, granule, suspension emulsion, solid formulation (piece agent), floating particle agent, the polymeric material.

These preparations prepare with original known method.Preparation of the present invention can be for example by using above-claimed cpd (a) and above-claimed cpd (b) and replenishers, promptly liquid flux and/or solid carrier randomly use surfactant, i.e. emulsifier and/or dispersant and/or blowing agent, mixing and preparing.

During as replenishers, organic solvent can be used as secondary solvent at water.As liquid flux, suitable basically is: organic solvent, for example as the aromatic hydrocarbon of dimethylbenzene, toluene or Fluhyzon and so on; The chloro aromatic hydrocarbon and the chloro aliphatic hydrocarbon of picture chlorobenzene, vinyl chloride or carrene and so on; Alkane as cyclohexane or image-stone oil distillate, mineral or plant oil and so on; As butanols or glycol and so on alcohol and ether and ester, as the ketone of acetone, methyl ethyl ketone, methyl iso-butyl ketone (MIBK) or cyclohexanone and so on; Intensive polar solvent as dimethyl formamide and methyl-sulfoxide and so on; And water.

What be fit to make solid carrier is: the natural minerals of ammonium salt and grinding for example, the levigate synthetic mineral of silicic acid, aluminium oxide or silicates that disperses as kaolin, clay, talcum, chalk, quartz, Attagel, montmorillonite or diatomite and image height and so on.What be fit to make the granular solids carrier is: for example, the natural rock with classification of grinding as calcite, marble, float stone, sepiolite and dolomite and so on, and the organic particle of the synthetic particle of inorganic and organic powder and picture sawdust, cocoa husk, corncob and tobacco stem and so on.

What be fit to make emulsification and/or blowing agent is: for example nonionic or anion emulsifier, picture polyoxygenated ethylidene-fatty acid ester, polyoxygenated ethylidene-fatty alcohol ether, for example alkaryl polyglycol ether, alkyl sulfonic ester, alkyl sulfate, aromatic yl sulphonate, and albumin hydrolysate.

What be fit to make dispersant is: for example lignin-sulfite waste liquor and methylcellulose.

In as the preparation of pulvis, granule or emulsion, can also use adhesive, below should be mentioned that the example of such adhesive: for example carboxymethyl cellulose and natural and synthetic polymer, as gum Arabic, polyvinyl alcohol and polyvinyl acetate, and as the natural phospholipid of cephalin and lecithin and so on, synthetic phosphide.As other additive, can use mineral oil and vegetable oil.

Can use colouring agent as inorganic face grain, for example iron oxide, titanium oxide and Prussian blue, with the organic dyestuff that dyes grain, azo dyes and metal phthalocyanine dyestuff and so on as alizarin with for example as the slaine of iron, manganese, boron, copper, cobalt, molybdenum and zinc and so on micronutrient.

Said preparation can contain 0.1-95% (weight) component (a) and component (b) total amount, preferably 0.5-90 (weight) usually.

Composition of the present invention can be only be used for control of weeds with itself or with the form of its preparation, or can be before use one is engraved in the bucket and mixes.In addition, composition of the present invention can by with other known reactive compounds that is used for the rice field, as fungicide, insecticide, plant growth regulator, plant nutrient agent, soil conditioner, injury palliative, also have other weed killer herbicides etc. to mix and use.

These compositions of the present invention can be with itself, with the form of its preparation or by further dilution type of service use prepared therefrom, for example ready-made solution, emulsion, suspension, pulvis, wetting powder and granule.The composition of these forms can be with usual method, for example by pouring, spray, atomize, dust or particle disseminating and is administered in the rice field.

Just as described above, these compositions of the present invention are very little with its injury to paddy rice to be key character.Therefore, if live rice field is particularly suitable for using to the rice field of the seedling that begins to grow (reaching about three leaf stages up to seedling behind the rice growing), may cause injury during this period.On the other hand, in the rice field of rice transplanting, it is pretty good to carry out application effect in rice transplanting, most possibly causes injury during this period of time.

But, use composition of the present invention and be not confined to above-mentioned period, and may use the rice field prior to seeding or before the rice transplanting.And, even after date is used also and can be reckoned with sufficient herbicidal effect when above-mentioned.

The amount of application of these compositions can change in a big scope.This amount of application is for example 0.1-2 kg/ha, the preferably total amount of 0.2-1.5 kg/ha component (a) and component (b).

Following examples have illustrated the excellent effect of the present composition, but should not constitute by any way

Limitation of the present invention.

Embodiment

Biologic test embodiment and example of formulations

Reactive compound (component)

A:2,5 '-two chloro-4 '-the nitro salicylanilide

B: α-(4,6-dimethoxypyridin-2-base carbamoyl sulfamoyl)-o-toluic acid methyl esters

C:N-(2-cyclopropyl carbonyl phenyl sulfamoyl base)-N '-(4,6-dimethoxypyridin-2-yl) urea

D:2-benzothiazole-2-base oxygen base-N-exalgine

E:-(2-chlorophenyl)-4-(N-cyclohexyl-N-ethylamino formoxyl)-5 (4H)-Terazololine-ones

The preparation of test chemical solution

Carrier: 5 parts of (weight) acetone

Surfactant: 1 part of (weight) benzyloxy polyglycol ether

1 part of (weight) reactive compound is mixed with above-mentioned loading gage body and above-mentioned scale surface-active agent, then the preparation that obtains is diluted with water to the specified activity compound concentration, to prepare a kind of test chemical solution.

Experimental example:To the herbicide effect of direct seading rice and the test of injury

Fill paddy soil in 1/2000 are of big basin (25 * 20 * 9 centimetres).After the water supply, soil fully mixes.When soil becomes muddy state, to the even sowing rice paddy seed (cultivar: Nihonbare), barnyard grass, Monochoria vaginalis, broad leaved weed (Procumbent Falsepimpernel, mexicana etc.), firefly common rush and the seed of Xiao Hua and the stem tuber of Japanese wide leaf arrowhead in the surface of each basin.When rice seedling grows to the 1.5-2.0 leaf stage, to each basin pour water to about 3 centimetres dark.Used for ponds in each test basin is previously prepared, the chemical solution that contains each reactive compound of specified amount.At duration of test, the depth of water in each basin remains on about 3 centimetres.

Behind the chemical treatment fortnight, with % evaluation herbicidal effect with to the extent of injury of paddy rice.These numerals:

100%=is dead fully

0%=does not have effect or not injury

As herbicidal effect and injury be respectively 90% or 90% or more and 10% or 10% below, expression is effective.Especially, judge the effect that injury reduces with following Colby formula.

The COlby formula

$E=\underset{100}{X+Y+Z}-\underset{\‾}{(\mathrm{XY}+\mathrm{XZ}+\mathrm{YZ})}$

[E in the formula: the expected value of injury (%)

X, Y, Z: the measured value (%) when each active component is used separately.]

W in table 1 " herbicidal effect (the %) " hurdle _1-W ₆Expression:

W ₁: barnyard grass W ₂: Monochoria

W ₃: width leaf weed W ₄: lamp leaf grass

W ₅: Japanese wide leaf arrowhead W ₆: Xiao Hua

The results are shown in the table 1.

Table 1

The compound of using	Heavy kilogram/the public affairs of active component are inclined	The effect of cutting weeds (%)						Rice damage (%)
										W 1	W 2	W 3	W 4	W 5	W 6	Measured value	Desired value
		A+B A+C A+D A+E A+E A+E A+E A+E A+E A+B+E A+C+E A B C D E	0.3+0.051 0.3+0.06 0.4+1.0 0.2+0.1 0.2+0.15 0.3+0.1 0.3+0.15 0.4+0.1 0.4+0.15 0.3+0.015 +0.15 0.3+0.06 +0.15 0.2 0.3 0.4 0.051 0.06 1.0 0.1 0.15	60 70 100 80 100 80 100 90 100 100 100 10 10 20 60 60 100 80 100	100 100 100 90 100 90 100 90 100 100 100 0 0 0 100 100 100 90 100	100 100 60 80 90 80 90 80 90 100 100 0 0 0 100 100 60 80 90	90 90 95 70 90 70 90 70 90 100 100 0 0 0 90 90 95 70 90	80 80 20 0 20 0 20 0 30 95 90 0 0 0 80 80 20 0 20	100 100 100 100 100 100 100 100 100 100 100 0 0 0 100 100 100 100 100									7 7 10 3 3 3 3 7 10 7 10 5 5 5 20 30 40 10 15	24 33.5 43 14.5 19.25 14.5 19.25 14.5 19.25 35.25 43.25 - - - - - - - -

Example of formulations 1

Water (25 parts) is added in the mixture of reactive compound A (6 parts), reactive compound E (3 parts), bentonite (montmorillonite) (30 parts), talcum (58 parts) and lignosulphonates (3 parts), well rub simultaneously, and make 10-40 purpose particle with the extrusion pressing type pellet fabrication device, then 40-50 ℃ of drying to obtain particle.

Example of formulations 2

The clay mineral (96 part) of size distribution in 0.2-2 millimeter scope is added in the rotary mixer, the rotation under to wherein spraying reactive compound A (3 parts), reactive compound E (1 part) and liquid diluent, with evenly wetting, follow 40-50 ℃ of drying to obtain particle.

Example of formulations 3

Obtain emulsion by mixing reactive compound A (20 parts), reactive compound E (10 parts), dimethylbenzene (55 parts), polyoxyethylene alkyl phenyl ether (8 parts) and alkyl benzene calcium sulfonate (7 parts).

Claims (3)

1, Herbicidal composition for paddy fields, they comprise contains as active component:

(a) 2 ', 5-two chloro-4 '-the nitro salicylanilide and

(b) 1-(2-chlorophenyl)-4-(N-cyclohexyl-N-ethylamino formoxyl)-5 (4H)-Terazololine-ones,

Wherein, composition (a) and ratio (b) are 1: 0.1 to 1: 1.

2, according to the composition of claim 1; with respect to 1 part of (weight) 2 '; 5-two chloro-4 '-the nitro salicylanilide, said composition contains 0.1-1 part (weight) 1-(2-chlorophenyl)-4-(N-cyclohexyl-N-ethylamino formoxyl)-5 (4H)-Terazololine-ones.

3, a kind of method of preventing and treating weeds in paddy field, it comprises that rice field when live rice field or transplanting rice is used and contains the Herbicidal combinations of following compound as active component,

(A) 2 ', 5-two chloro-4 '-the nitro salicylanilide and

(b) 1-(2-chlorophenyl-4-(N-cyclohexyl-N-ethylamino formoxyl)-5 (4H)-Terazololine-ones,

Wherein, composition (a) and ratio (b) are 1: 0.1 to 1: 1,

The amount of application of composition is 0.1 to 2 kg/ha.