CN102379302B - Postemergence compound herbicide for wheat - Google Patents
Postemergence compound herbicide for wheat Download PDFInfo
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Abstract
The invention relates to the technical field of herbicides, and discloses a postemergence compound herbicide for wheat. The postemergence compound herbicide for wheat contains two types of active ingredients, namely, mesosulfuron-methyl and florasulam, wherein the weight ratio of the mesosulfuron-methyl to the florasulam is (2-4):1, and preferably, the weight percentage of the mesosulfuron-methyland the florasulam is 0.1-85% of the compound herbicide. The compound herbicide disclosed by the invention both can be used for preventing and killing off annual grass weeds and broadleaf weeds in wheat lands, and has a significant weeding effect, a remarkable synergistic effect, and no effect on after-reap crops, therefore, the compound herbicide is an ideal herbicide.
Description
Technical field
The present invention relates to technical field of pesticide, be specifically related to a kind of mixed herbicide of wheat after seedling.
Background technology
Wheat is one of staple food crop of northern China, is also important forage crop, and the long-term cultivated area of China is only second to Monitoring of Paddy Rice Plant Area at more than 3,000 ten thousand hectares.Wheatland crop smothering area accounts for more than 30% of total cultivated area, and wherein serious injured area is more than 8%, and the general underproduction can be had no harvest when serious more than 15%.Therefore, the usage ratio of domestic wheat paddock weed killer herbicide almost reaches 100%, and its dosage is very large.At present, the main medicament of weed killer herbicide of domestic wheat paddock seedling Weed Control Effect after Improvement has: fenoxaprop, mesosulfuron, flucarbazone, tribenuron-methyl, fluroxypyr, dicamba, metsulfuron-methyl, thifensulfuron methyl, isoproturon etc., but because using for many years, many weeds have produced pesticide resistance, cause its consumption to strengthen, easily make wheat produce recessive poisoning and the underproduction, and also not too safe to succession crop.In addition, due to the use of chemical herbicide for many years, variation has occured in the weed control of China, and originally the north becomes as acting the leading role that the South and the North is grass family and broad leaved weed coexists take broad leaved weed as main, south take grassy weed.So just in the urgent need to preventing and kill off the wheat paddock grassy weed, can prevent and kill off broad leaved weed again, neither affect the safety of succession crop, the weed killer herbicide more friendly to environment again, and this type of weed killer herbicide of China is seldom seen at present.
Mesosulfuron is selective herbicide after sulfonylurea inner sucting conduction type seedling, is the inhibitor of acetolactate synthase.Grass cutting blade namely stops growing after absorbing medicament, withered gradually.The longevity of residure of this medicine in soil is short, does not affect the second stubble crop growth.Be mainly used in wheat, naked barley etc. are except grassy weed and some broad leaved weed.
Florasulam is triazolopyrimidine sulfonamides super-high-efficient weed killer herbicide, and florasulam is inner-adsorption conduction-type herbicide, can conduct to the weeds complete stool, thereby herbicide is thorough, can not recur.Efficacy stability at low temperatures, even still can guarantee to stablize drug effect in the time of 2 ℃, this point is that other weed killer herbicides are incomparable.Be used for wheat paddock and prevent and kill off broad leaved weed.The florasulam broad weed-killing spectrum can be prevented and kill off the most of broad leaved weeds of wheatland, comprises the difficult anti-weeds such as clearvers, corn gromwell, and the most difficult wartwort of preventing and kill off in wheatland is had extraordinary inhibitory action.
Summary of the invention
The purpose of this invention is to provide and a kind ofly can prevent and kill off grassy weed, can prevent and kill off broad leaved weed again, and respond well mixed herbicide of wheat after seedling.。
In order to realize the foregoing invention purpose, the invention provides following technical scheme:
A kind of mixed herbicide of wheat after seedling comprises mesosulfuron and florasulam, and the weight ratio of mesosulfuron and florasulam is 2～4: 1.
More preferably, in complex weedicide of the present invention, the weight ratio of mesosulfuron and florasulam is 3: 1.
On the other hand, the invention provides that in described complex weedicide, the quality percentage composition of mesosulfuron and florasulam is 0.1～85% of described complex weedicide.As preferably, in complex weedicide of the present invention, after two kinds of active components of mesosulfuron and florasulam are composite according to above-mentioned weight ratio, make oil-suspending agent, suspending agent, wetting powder, water dispersible granules (dry suspending agent).
Synergy after being mixed with the co-toxicity coefficient method evaluation of Sun Yunpei, result shows that mesosulfuron, florasulam are in 2～4: the composite co-toxicity coefficient of 1 ratio is obviously greater than 120, reach remarkable synergistic effect, illustrate that mesosulfuron, florasulam are in 2～4: 1 ratio is mixed all synergistic effect, wherein, mesosulfuron, florasulam have significant synergies to annual single broadleaf weed by 3: 1 effect compound synergic effect maximums.
Security test test to wheat shows, the composite cauline leaf processing of mesosulfuron florasulam, the ED of inhibition wheat growth 10%
10=633.5774, the ED of inhibition weed growth 90%
90=147.8637, selectivity factor is 633.5774/147.8637=4.28＞2, thinks that this medicament has obvious selectivity, and the mesosulfuron florasulam has good safety to wheat.
Complex weedicide of the present invention shows by the field control effectiveness test of 2 years, arrives period of seedling establishment in the 3 leaf phases of wheat, and weeds 1-5 leaf does not wait the phase, and wheat has no symptom of chemical damage from the dispenser to the maturing stage, to wheat safety.The preventive effect of weeds reached more than 80% in 20 days, reached more than 90% in 60 days, along with the increase of dosage, preventive effect obviously strengthens, and a dispenser can be controlled the weeds of crop in whole vegetative period, and not only herbicidal effect is remarkable, and environmentally friendly, on second stubble crop without impact.
Compared with prior art, complex weedicide of the present invention can be prevented and kill off grassy weed, can prevent and kill off broad leaved weed again, to wheat safety, and on succession crop without impact, have a good application prospect.
Embodiment
The invention discloses a kind of mixed herbicide of wheat after seedling that comprises mesosulfuron and two kinds of active components of florasulam, those skilled in the art can use for reference this paper content, suitably improve technological parameter and realize.Special needs to be pointed out is, all similarly replace and change apparent to those skilled in the art, and they all are deemed to be included in the present invention.Product of the present invention and application are described by preferred embodiment, the related personnel obviously can change methods and applications as herein described within not breaking away from content of the present invention, spirit and scope or suitably change and combination, realizes and use the technology of the present invention.
Below in conjunction with embodiment, further set forth the present invention:
Embodiment 1: the oil-suspending agent (mesosulfuron: florasulam=2: 1) of preparation complex weedicide of the present invention
6% mesosulfuron florasulam oil-suspending agent, 6% refers to that mesosulfuron and two kinds of active components of florasulam account for the percentage of gross weight.Get the 4kg mesosulfuron, the 2kg florasulam, 8kg Pluronic125, the 5kg propane diols, the 0.5kg xanthans, the 1kg methylated vegetable oil, water complements to 100kg.Pass through abundant mixing preparation, ball mill grinding, adjust, be packaged to be oil-suspending agent.
Embodiment 2: the wetting powder (mesosulfuron: florasulam=3: 1) of preparation complex weedicide of the present invention
28% mesosulfuron florasulam wetting powder, 28% refers to that mesosulfuron and two kinds of active components of florasulam account for the percentage of gross weight.Get the 21kg mesosulfuron, the 7kg florasulam, 4kg dispersant NNO, 3kg wetting agent K12, the 4kg White Carbon black, precipitated calcium carbonate complements to 100kg.Through fully mixing, air-flow crushing, mixing, obtain wetting powder.
Embodiment 3: the water dispersible granules (mesosulfuron: florasulam=4: 1) of preparation complex weedicide of the present invention
50% mesosulfuron florasulam water dispersible granules, 50% refers to that mesosulfuron and two kinds of active components of florasulam account for the percentage of gross weight.Get the 40kg mesosulfuron, the 10kg florasulam, 7kg D-425,5kgEFW, 5kg ammonium sulfate, the 2kg polyethylene glycol, kaolin supplies 100%, obtains water dispersible granules through fully mixing, air-flow crushing, mixing, granulation, drying and screening.
Embodiment 4: mesosulfuron and florasulam cauline leaf are processed the synergy toxicity and are measured
1, test objective
Under greenhouse experiment, adopt pot-culture method, the herbicidal effect of research mesosulfuron, florasulam binary built, and estimate the synergy type after mixed of different proportions both with the co-toxicity coefficient method of Sun Yunpei, for the rational mixture of mesosulfuron and florasulam provides scientific basis.
2, experimental condition
2.1 for studying the thing wheat breed: Anhui wheat 33
2.2 broadcast ma wormwood artemisia (Descurainia sophia (L.) Schur), clearvers (Galium aparine L.), Wang grass (Beckmannia syzigachne (Steud.) Fern), wild oat (Avena fatua L.) upper one year of field gather seed, germination rate is more than 85%) for the examination weeds.
2.3 the cultivation of experimental condition and examination material
Carry out the cultivation of test material in the illumination cultivation chamber, temperature 15-20 ℃.Choosing diameter is 15cm, is highly the vinyon basin alms bowl of 15cm, and the permeable hole of 1cm diameter is beaten in the bottom of basin alms bowl.Permeable hole covers with double-deck filter paper, and the loam that the preparation in advance of packing in alms bowl was sterilized soaks into soil with clear water from the bottom to the high 10cm of alms bowl place.During test, every kind of weed seed 30-40 grain is evenly put into basin, earthing 0.5cm should replenish the required moisture of growth between the weeds culture period.
2.4 other condition
With the regular moisturizing of mode (not watering in 2 days after medicine) of bottom infiltration, keep soil moisture.
3 experimental scheme
3.1 medicament
3.1.1 reagent agent
The 93% former medicine of mesosulfuron (Bayer Bitterfeld GmbH crop science company);
The 97% former medicine of florasulam (The Dow Agrosciences, LLC.).
3.1.2 reagent agent liquid preparation
Take quantitative former medicine with electronic balance, add appropriate emulsifier, use acetone solution, with 0.1% the POLYSORBATE 80 aqueous solution, above-mentioned former medicine is diluted to desired concn at last.
3.1.3 experimental scheme
3.1.3.1 the synergy of mesosulfuron and florasulam
Mesosulfuron, florasulam single dose and 5 mesosulfurons and florasulam mixture preparation are established respectively 5 dosage, and described ratio is the active component weight ratio of mesosulfuron and florasulam.Separately establish blank, each test is processed and is repeated 4 times.Treatment agent dosage sees table 1 for details.
Table 1 test is processed and test level (concentration ga.i./mu)
3.2 application method
3.2.1 application method
Process in 3 leaf phases of wheat, the spraying of weeds 2-4 leaf phase cauline leaf.The spray medicine adopts the indoor crown-block type atomizing tester of adjustable speed, the conventional spray method in simulation field.Shower nozzle is Fan spray head, and model is the Teejer8002E type, 40 kg/acres of spray values.0.5 meter of spray height, 0.7 meter of spraying swath, leg speed 0.224 meter per second.Atomisation pressure 2.0 MPas, 697 liter/mins of flows.
3.2.2 spraying time and number of times
Tested in the wheat 3-5 leaf phase and carry out reagent spray processing, dispenser 1 time.
4 investigation methods
The symptom of being injured of detail record wheat and weeds after dispenser, 20d after medicine carries out fresh weight and measures, and compares with control treatment, calculates the fresh weight preventive effect.
4.1 synergy assay method
Synergy type after result of the test is mixed with the co-toxicity coefficient method evaluation of Sun Yunpei.
According to SUN, Y-P (Sun Yunpei) method is calculated its actual toxicity index, the theoretical toxicity index of mixture, co-toxicity coefficient.Take the concentration logarithm as X, damage by disease and insect preventive effect probit value is Y, asks regression equation.
Actual toxicity index=standard medicament LD
50The LD of/mixture
50* 100
Theoretical toxicity index=∑ (toxicity index of reagent agent * percentage of this medicament active ingredient in mixture)
The actual toxicity index of co-toxicity coefficient=mixture/theoretical toxicity index * 100
In test take florasulam as the standard medicament.
Criterion: co-toxicity coefficient＜80 are antagonism, are summation action between 80-120, and＞120 are synergistic effect.
5 results and analysis
5.1 the synergy of mesosulfuron and florasulam
5.1.1 mesosulfuron and florasulam are mixed to the fresh weight preventive effect of weeds, the results are shown in Table 2.
Table 2 mesosulfuron and the florasulam fresh weight preventive effect of 20d to weeds after medicine that be mixed
In table, control efficiency is the mean value of four data.
5.1.2 mesosulfuron and florasulam are mixed to the synergy of weeds
As shown in Table 2: toxic action situation and the preventive effect of medicament to weeds.Calculate its virulence regression equation, LD separately by formula
50, actual toxicity index, theoretical toxicity index and co-toxicity coefficient.List in table 3.
Table 3: mesosulfuron and florasulam are mixed to the synergy of weeds
By test as can be known, the co-toxicity coefficient of processing C, D, E, F, G is respectively: 95.81,130.76,227.34,141.51,93.03, and wherein, the co-toxicity coefficient of C, G is addition greater than 80, less than 120; The co-toxicity coefficient of D, E, F reaches remarkable synergistic effect all obviously greater than 120, and the co-toxicity coefficient of wherein processing E is maximum.
5.1.3 conclusion (of pressure testing)
By test as can be known, mesosulfuron, florasulam are mixed in 2: 1～4: 1 ratios all synergistic effect, and wherein, it is comparatively suitable that mesosulfuron, florasulam are mixed by 3: 1 left and right, and annual dicotyledonous weeds is had significant synergies.
6 overall merits
Shown by above synergy measurement result, mesosulfuron and florasulam are both better with the composite effect of the ratio of 2: 1～4: 1, wherein with 3: 1 composite best results of left and right ratio.
Embodiment 5: the composite cauline leaf of mesosulfuron florasulam is processed the Security test test to wheat
1, test objective:
Under greenhouse experiment, adopt pot-culture method, research mesosulfuron, florasulam binary built cauline leaf are processed the safety to wheat, for the rational mixture of mesosulfuron and florasulam provides scientific basis.
2, experimental condition
2.1 for studying the thing wheat breed: Anhui wheat 33
2.2 broadcast ma wormwood artemisia (Descurainia sophia (L.) Schur), clearvers (Galium aparine L.), Wang grass (Beckmannia syzigachne (Steud.) Fern), wild oat (Avena fatua L.) (upper one year the field seed of gathering, germination rate is more than 85%) for the examination weeds.
2.3 the cultivation of experimental condition and examination material
Carry out the cultivation of test material in the illumination cultivation chamber, temperature 15-25 ℃.Choosing diameter is 15cm, is highly the vinyon basin alms bowl of 15cm, and the permeable hole of 1cm diameter is beaten in the bottom of basin alms bowl.Permeable hole covers with double-deck filter paper, and the loam that the preparation in advance of packing in alms bowl was sterilized soaks into soil with clear water from the bottom to the high 10cm of alms bowl place.During test, 20, every kind weed seed 30-40 grain of wheat seed is evenly put into basin earthing 0.5cm, put into the greenhouse and cultivate (15-25 ℃), should replenish the required moisture of growth between wheat seedling and weeds culture period.Stay the seedling of 10 strain stalwartnesses after all sprouting, grow to 3～4 leaves and weeds until wheat seedling and grow to dispenser in 3～5 o'clock and process.
2.4 other condition
With the regular moisturizing of mode (not watering in 2 days after medicine) of bottom infiltration, keep soil moisture.
3 experimental scheme
3.1 medicament
3.1.1 reagent agent
The 93% former medicine of mesosulfuron (Bayer Bitterfeld GmbH crop science company);
The 95% former medicine of florasulam (The Dow Agrosciences, LLC.).
3.1.2 reagent agent liquid preparation
Take quantitative former medicine with electronic balance, add appropriate emulsifier, use acetone solution, with 0.1% the POLYSORBATE 80 aqueous solution, above-mentioned former medicine is diluted to desired concn at last.
3.2 application method
3.2.1 application method
Process in 3 leaf phases of wheat, the spraying of weeds 2-4 leaf phase cauline leaf.The spray medicine adopts the indoor crown-block type atomizing tester of adjustable speed, the conventional spray method in simulation field.Shower nozzle is Fan spray head, and model is the Teejer8002E type, 40 kg/acres of spray values.0.5 meter of spray height, 0.7 meter of spraying swath, leg speed 0.224 meter per second.Atomisation pressure 2.0 MPas, 697 liter/mins of flows.
3.2.2 spraying time and number of times
Tested in the 3 leaf phases of wheat and carry out reagent spray processing, dispenser 1 time.
4 investigation and computational methods
4.1 crop investigation
After dispenser, investigation is respectively processed wheat and is had or not symptom of chemical damage, if detail record symptom of chemical damage, grade are arranged, and after medicine 20 days, measure and respectively process the wheat fresh weight, calculate the fresh weight inhibiting rate, with the safety of clear and definite test medicine to wheat.
4.2 weeds investigation
The symptom of being injured of detail record weeds (as growth inhibition, chlorosis, deformity etc.) after dispenser, after medicine 20 days, weeds acrial part fresh weight was respectively processed in weighing, calculated the fresh weight preventive effect of weeds.
4.3 computational methods
With DPS software, the logarithm value of drug dose and the probability value of wheat fresh weight inhibiting rate are carried out regression analysis, the dosage ED when calculating correlation coefficient and suppressing crop 10%
10, and suppress weeds 90%ED
90, obtain selectivity index.
Selectivity index=ED
10/ ED
90
5 results and analysis
5.1 mesosulfuron florasulam cauline leaf is processed the safety to wheat
The safety evaluatio standard sees Table 4, observes in 3 days after dispenser, and mesosulfuron florasulam high concentration 3600mg/kg processes the distortion of indivedual wheat lobus cardiacus, and growth is suppressed, and low concentration is processed the wheat growth normal; After dispenser 7-12 days, it is normal that low concentration is processed the wheat growing way, and 3600mg/kg processes wheat and also slowly recovers.After dispenser, 20 days 50% mesosulfuron florasulam WG see Table 5 to the inhibitory action of wheat.
Table 4 activity of weeding and crop safety ocular estimate evaluation criterion
The inhibitory action of table 550% mesosulfuron florasulam WG to wheat
| Process | Mass concentration (mg/kg) | 20d inhibiting rate (%) |
| 225 | 0.25 | |
| 450 | 0.75 | |
| 50% mesosulfuron florasulam WG | 900 | 2.00 |
| 1800 | 7.50 | |
| 3600 | 20.25 | |
| Contrast | Clear water | / |
The fresh weight preventive effect of table 6 50% mesosulfuron florasulam WG to weeds
Toxic action situation and the preventive effect of this medicament to weeds, calculate its virulence regression equation, LD respectively by formula as shown in Table 6
50, list in table 7.
Table 7: virulence regression equation and LD
50
| Process | Regression equation | Correlation coefficient | LD 50 | 95% confidence interval |
| A | Y＝-0.2323+2.3570x | 0.9925 | 165.9346 | 143.8011-191.4749 |
As shown in Table 7: the LD50 of 50% mesosulfuron florasulam WG is: 165.9346,95% confidence intervals are 143.8011-191.4749.
5.2 mesosulfuron florasulam cauline leaf is processed the selectivity index to wheat and weeds
By table 5, table 6, try to achieve the ED that suppresses wheat growth 10% by DPS software
10=2182.5620, the ED of inhibition weed growth 90%
90=561.1078, selectivity factor is 2182.5620/561.1078=3.89＞2, thinks that this medicament has obvious selectivity, can carry out field control effectiveness test.
6 overall merits
6.1 this result of the test shows, mesosulfuron florasulam cauline leaf is processed high concentration and is processed and can cause wheat yellow, indivedual plant distortion to wheat, and it is normal that other concentration is processed wheat growth.
6.2 the mesosulfuron florasulam has good control efficiency to weeds by Toxicity Determination as can be known.
Embodiment 6: complex weedicide field control effectiveness test of the present invention
Complex weedicide of the present invention shows by the field control effectiveness test of 2 years, wheat period of seedling establishment before the winter, weeds 1-5 leaf does not wait the phase, utilize 3,4,5,8 g/acres of 28% mesosulfuron florasulam of the present invention (24% mesosulfuron+8% florasulam) wetting powder (WP) dosage, being watered 40 kg/acres sprays, 20, the range estimation wheat safety of 60 days and maturing stage and weeds preventive effect, surveyed all preventive effects, result such as following table in 20,60 days:
By range estimation, wheat has no symptom of chemical damage from the dispenser to the maturing stage, to wheat safety.20 g/acres of the preventive effects of weeds were reached more than 80% in 20 days, reached more than 90% in 60 days, increase along with dosage, preventive effect obviously strengthens, can good herbicidal effect be arranged to weeds 3 g/acres of wheat paddocks, with wherein a kind of active ingredient comparison of independent use, enlarged the herbicide spectrum, grassy weed and broad leaved weed are had obvious synergistic effect.A dispenser can be controlled the weeds of crop in whole vegetative period, and not only herbicidal effect is remarkable, and environmentally friendly, and is without impact, little to the pollution of environment on second stubble crop, to people, animal, birds and beneficial organism safety, is conducive to keep ecological balance.In addition, weed killer herbicide of the present invention adopts physical method processing, and production technology is simple, and three-waste free discharge in production process has no adverse effects to ecotope.It is the desirable complex weedicide of present control efficiency.
The above is only the preferred embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (5)
1. a mixed herbicide of wheat after seedling, is characterized in that, the active ingredient of described complex weedicide is mesosulfuron and florasulam, and the weight ratio of mesosulfuron and florasulam is 2～4: 1.
2. complex weedicide according to claim 1, is characterized in that, the weight ratio of described mesosulfuron and florasulam is 3: 1.
3. complex weedicide according to claim 1 and 2, is characterized in that, the quality percentage composition of described mesosulfuron and florasulam is 0.1～85% of described complex weedicide.
4. complex weedicide according to claim 1 and 2, is characterized in that, described complex weedicide is oil-suspending agent, suspending agent, wetting powder, water dispersible granules.
5. complex weedicide according to claim 3, is characterized in that, described complex weedicide is oil-suspending agent, suspending agent, wetting powder, water dispersible granules.
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| CN102379302B true CN102379302B (en) | 2013-06-12 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102550585A (en) * | 2012-01-16 | 2012-07-11 | 河北博嘉农业有限公司 | Mesosulfuron-methyl compound herbicide |
| CN104186518A (en) * | 2014-08-19 | 2014-12-10 | 青岛清原植保服务有限公司 | Herbicide safener composition |
| CN106342858A (en) * | 2016-08-26 | 2017-01-25 | 安徽久易农业股份有限公司 | Post-emergence compound herbicide for wheat fields |
| CN106342859B (en) * | 2016-08-26 | 2018-12-14 | 安徽久易农业股份有限公司 | Mesosulfuron oil-suspending agent |
| CN107156163A (en) * | 2017-07-14 | 2017-09-15 | 安徽海日生物科技有限公司 | A kind of mesosulfuron and florasulam compound dispersible oil-suspending agent and preparation method thereof |
| CN107318873B (en) * | 2017-08-16 | 2019-07-02 | 安徽尚禾沃达生物科技有限公司 | A kind of Herbicidal combinations containing mesosulfuron and florasulam |
| CN109380249A (en) * | 2018-12-03 | 2019-02-26 | 浙江中山化工集团股份有限公司 | A kind of herbicide composition for wheat field |
| CN111328822A (en) * | 2020-04-20 | 2020-06-26 | 山东碧奥生物科技有限公司 | Mesosulfuron-methyl and florasulam compounded dispersible oil suspension and preparation method thereof |
| CN115152779A (en) * | 2022-08-17 | 2022-10-11 | 淄博新农基农化科技有限公司 | Novel weeding composition |
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| CN102037986A (en) * | 2011-01-13 | 2011-05-04 | 青岛瀚生生物科技股份有限公司 | Compounded composition containing tribenuron-methyl and florasulam |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449246A (en) * | 2000-08-31 | 2003-10-15 | 巴斯福股份公司 | Method for producing a solid herbicide formulation |
| EP2033521A2 (en) * | 2001-07-21 | 2009-03-11 | Bayer CropScience AG | Herbicide combinations with special sulfonylurea |
| CN1642426A (en) * | 2002-03-05 | 2005-07-20 | 拜尔作物科学有限公司 | Herbicide combinations with special sulfonylureas |
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