CN1303595A - Disposable weedicide for rice field - Google Patents

Abstract

A weedicide for rice field is made up by using (wt%) 1-60 % of mefenacent and 0.1-20% of cinosulfuron as effective components and adding moistening agent, dispersing agent and filler through a compounding process. Said invented weedicide not only can broaden weed-killing spectrum, raise weeding effect, but also can reduce number of times for applying the weedicide, can make weeds delay production of drug-resistance, and can reduce environmental pollution.

Description

Disposable weedicide for rice field

The invention belongs to chemical pesticide, relate in particular to a kind of Disposable weedicide for rice field that contains mefenacet and cinosulfuron.

Mefenacet (mefenacet) molecular formula is C ₁₆H ₁₄N ₂O ₂S, chemical name are 2-(1,3-benzothiazole-2-base oxygen)-N-methyl acetanil, and its structural formula is:

Cinosulfuron (cinosldfuron) molecular formula is C ₁₅H ₁₉N ₅O ₇S, chemical name are 1-(4,6-dimethoxy-1,3,5-triazines-2-yl)-1-[2-(2-methyl ethoxy) phenyl] sulfonylureas, its structural formula is:

Mefenacet is the selectivity preemergence herbicide, can prevent and kill off grassy weed, and the barnyard grass grass is had special efficacy, but undesirable to the broad leaved weed preventive effect.Cinosulfuron is a sulfonylurea herbicide, can effectively prevent and kill off annual broadleaf weed and sedge weed, but bad to the grassy weed effect.And generally the field piece all is that multiple weed community exists the crop of causing harm jointly, if use mefenacet and cinosulfuron separately, herbicidal spectrum is single, can not reach the effect of comprehensive weeding.Two kinds of combined use of pesticides can enlarge grass spectrum extremely, but in actual mechanical process, existing mixing now used dosage with being difficult for grasping, thereby herbicidal effect is also unstable, is unfavorable for applying.

The objective of the invention is shortcoming, provide a kind of paddy field disposable complex weedicide, both can enlarge and kill grass spectrum, raising herbicidal effect, can reduce the weeding cost effectively again at prior art.

Disposable weedicide for rice field of the present invention is an active ingredient with mefenacet and cinosulfuron, and adds composite forming such as wetting agent, dispersant, filler.

The auxiliary agent that wetting agent, dispersant, filler all adopt general Recompounded pesticide to use always, wherein wetting agent has alkylnaphthalene sulfonate, lignosulfonates, fatty alkyd sodium etc.; Dispersant has naphthalenesulfonic acid-formaldehyde condensate (NNO), alkylnaphthalene sulfonate etc.; Filler has white carbon, precipitated calcium carbonate (abbreviation fine particle calcium carbonate), diatomite, kaolin etc.

Disposable weedicide for rice field of the present invention, its composition and content are (percetage by weight):

Mefenacet 1-60%

Cinosulfuron 0.1-20%

Wetting agent 0.1-15%

Dispersant 0.1-15%

The filler surplus

In order to make the better effect of Disposable weedicide for rice field of the present invention performance, the weight ratio of active ingredient mefenacet and cinosulfuron is 1-20: 1-3 for well.

Disposable weedicide for rice field of the present invention, its preparation method has spraying cooling molding method, comminuting method etc., wherein the breaking plant of comminuting method employing has micronizer and airslide disintegrating mill, production process is as follows: mix joining in the mixer behind the various material meterings, mixed material is pulverized in cracker through feeder, and the material after the pulverizing is finished product by cyclone separator and sack cleaner, Agravicmixer after mixing.

Disposable weedicide for rice field of the present invention, the formulation that can be processed into have aqueous solvent, wetting powder WP, suspending agent SC, suspended emulsion, colloidal suspending agent etc., mainly adopt wetting powder.

Disposable weedicide for rice field of the present invention is applicable to that rice seedling throwing field, transplant field prevent and kill off various weeds.

Advantage of the present invention and remarkable result:

1. enlarged and killed the grass spectrum

Single agent cinosulfuron is respectively 71% in medication 15 days and 30 days preventive effects to the barnyard grass grass

With 67%, total preventive effect also only is 82% and 76%.Remove and paddy field of the present invention is disposable

The barnyard grass grass can be effectively prevented and kill off in the grass agent, and total preventive effect can reach more than 95%, and it is right to have remedied cinosulfuron

The defective of grassy weeds such as barnyard grass grass has enlarged and has killed the grass spectrum.

2. prolonged the lasting period

Mefenacet has the different careless mechanism of killing with cinosulfuron, and back test of pesticide effectiveness table is mixed

Bright not only weeding speeds up, and a growth period duration of rice only need medication once, prolong

Grow action time, improved drug effect.

3. reduce the medication number of times, reduce drug cost

Single agent cinosulfuron cost is higher, makes Disposable weedicide for rice field of the present invention

After, reduced cost, use also convenient.

4. reduction environmental pollution has improved safety

The minimizing of dosage and medication number of times, reduced relatively agricultural chemicals to soil, water,

The pollution of atmosphere etc. has improved crop and human safety.

Embodiment 1:

The weight content percentage of each component is:

Mefenacet 50%

Cinosulfuron 4%

Sodium lignin sulfonate 10%

Dodecyl sodium naphthalene sulfonate 2%

White carbon 10%

The fine particle calcium carbonate surplus

To contain active ingredient be 54% wetting powder as making as described in the specification, and its herbicidal effect sees Table 1 (table medium-height grass kill off and be Disposable weedicide for rice field of the present invention, plough the husband be the agent of cinosulfuron list).

Table 1 54% grass is killed WP off and is prevented and kill off rice seedling throwing field weed effect research

Repeat	(g, ml/ mu) is handled in test
						54% grass is killed WP (g/ mu) off			10% ploughs husband WP (g/ mu)	??CK
		????25	????35	???45	????10
????1						??86.32	??96.58	??100	????67.52	????48
	????2	??81.20	??93.16	??100	????58.97						????72
????3						??88.03	??94.87	??100	????79.49	????54
	????4	??82.91	??94.87	??100	????77.78						????60
Preventive effect (%)						??84.62	??94.87	??100	????70.94	??58.5

Embodiment 2: the weight content percentage of each component is:

Mefenacet 60%

Cinosulfuron 10%

Dodecyl sodium naphthalene sulfonate 0.5%

NNO?????????????????5％

White carbon 10%

The fine particle calcium carbonate surplus

To contain active ingredient be 70% wetting powder as making as described in the specification.

Embodiment 3: the weight content percentage of each component is:

Mefenacet 55%

Cinosulfuron 20%

Sodium lignin sulfonate 5%

NNO?????????????5％

White carbon 8%

The fine particle calcium carbonate surplus

To contain active ingredient be 75% wetting powder as making as described in the specification.

Claims (8)

1. a Disposable weedicide for rice field is characterized in that active ingredient is mefenacet and cinosulfuron.

2. weed killer herbicide as claimed in claim 1 is characterized in that also containing in the described weed killer herbicide wetting agent, dispersant and filler.

3. weed killer herbicide as claimed in claim 2 is characterized in that the composition of weed killer herbicide and content are (percetage by weight):

Mefenacet 1-60%

Cinosulfuron 0.1-20%

Wetting agent 0.1-15%

Dispersant 0.1-15%

The filler surplus

4, weed killer herbicide as claimed in claim 3, the weight ratio that it is characterized in that active ingredient mefenacet and cinosulfuron is 1-20: 1-3.

5,, it is characterized in that described dispersant is naphthalenesulfonic acid-formaldehyde condensate (NNO), alkylnaphthalene sulfonate as claim 2,3,4 described weed killer herbicides.

6,, it is characterized in that described wetting agent is alkylnaphthalene sulfonate, lignosulfonates, fatty alkyd sodium as claim 2,3,4 described weed killer herbicides.

7, as claim 2,3,4 described weed killer herbicides, it is characterized in that described filler be white carbon, precipitated calcium carbonate, diatomite, kaolinic one or more.

8,, it is characterized in that described weed killer herbicide is a wetting powder as claim 1,2 described weed killer herbicides.