CN1393133A - Composite herbicide for rice field - Google Patents

Abstract

A compound herbicide for rice field is prepared from Sizuocaoan and the herbicide chosen from bensulfuron-methyl, pyrazosulfuron-ethyl and sulfometuron-methyl through mixing in weight ratio of (0.5-30):1 and preparing such dosage forms as wettable powder, suspension, tablet and particles. Its advantages are broad spectrum, high effect, and high safety.

Description

The composite herbicide that is used for the rice field

The invention belongs to chemical pesticide, be specifically related to the weed killer herbicide of paddy field.

Active ingredient mainly contains two kinds: a kind of is that effective ingredient is four cafenstroles, and another kind is sulfonylurea herbicide (any in bensulfuron-methyl, pyrazosulfuron or the cinosulfuron).

Four cafenstroles (fentrazamide), chemical name is: 4-(2-chlorphenyl)-5-oxygen-4.5-dihydro-tetrazolium-1-carboxylic acid cyclohexyl-buserelin, its molecular formula is: C ₁₆H ₂₀ClN ₅O ₂Its structural formula is

Bensulfuron-methyl (bensulfuron methyl) chemical name is 2-{[(4,6-dimethoxypyridin-2-yl) amino carbonyl amino] the sulfonyl methyl } methyl benzoate, its molecular formula is: ester is C ₁₆H ₁₈N ₄O ₇S, acid is C ₁₅H ₁₆N ₄O ₇S.Its structural formula is

Pyrazosulfuron (pyrazosulfuron-ethyl) chemical name is: 5-(4,6-dimethoxypyridin base-2-carbamyl sulfonamides)-1-methylpyrazole base-4-ethyl ester; Its molecular formula is: C ₁₄H ₁₈N ₆O ₇S; Its structural formula is:

Yellow grand (cinosulfuron) chemical name of ether is 1-(4,6-dimethoxy-1,3,5-triazines-2-yl)-3-[2 (2-methoxy ethoxy) phenyl sulphonyl] urea; Chemical formula is: C ₁₅H ₁₉N ₅O ₇S; Its structural formula is:

Four cafenstroles are the chemical herbicide of brand-new chemical constitution, it is cytostatic agent, has interior absorption, can suppress the cell division in weeds root and the meristem zone of bud portion fully, cause it to stop growing and the elongated structure distortion, from before the bud to barnyard grass grass tri-leaf period, the barnyard grass grass there is very high preventive effect, and to rice safety, this weed killer herbicide also can effectively be prevented and kill off moleplant seed, difformed galingale herb, Monochoria vaginalis, needle spikesedge herb, but then not ideal enough to the preventive effect of some kind weeds such as lustrous and transparent Lin, Sagittaria pygmaea and Herba Cyperi Glomerati and some perennial nutgrass flatsedge and broad leaved weed.

Sulfonylurea herbicide (in bensulfuron-methyl, pyrazosulfuron or the cinosulfuron any) is a kind of selectivity inner sucting conduction type weed killer herbicide, can be absorbed by root of weeds and blade, and transfer to the weeds complete stool very soon, can hinder the amino acid whose biosynthesis of weeds, thereby stop cell division and growth, but as safe as a house to paddy rice, be suitable for different soil properties, various types of paddy field weeding.Before bud or the bud post processing, annual and perennial broad leaved weed and sedge weed all there is good preventive effect, as four leaf duckweeds, pondweed, Monochoria vaginalis, short arrowhead, flat bar Fischer grass, needle spikesedge herb, Procumbent Falsepimpernel, false loosestrife, convexutricle sedge herb, lustrous and transparent Lin, sweet wine intestines etc., but poor to the preventive effect of grassy weeds such as barnyard grass grass, moleplant seed.

On producing, four cafenstroles and bensulfuron-methyl (or pyrazosulfuron, or cinosulfuron) all can be used for rice seedling bed, live field, seedling throwing field, transplant field weeding.Generally speaking, four cafenstrole list usefulness, consumption is about 8～12 gram effective ingredient/mus.Bensulfuron-methyl uses separately, and dosage is about 1.5～2 gram effective ingredient/mus.Pyrazosulfuron uses separately, and consumption is about 1.0～1.5 gram effective ingredient/mus, and cinosulfuron uses separately, and consumption is about 1.3～2.0 gram effective ingredient/mus.Singly under actual conditions, malignant weeds such as barnyard grass grass, moleplant seed, short arrowhead, mexicana all take place simultaneously, single harm that all can not reach disposable control weeds with four cafenstroles or bensulfuron-methyl (or pyrazosulfuron, or cinosulfuron).

In sum, the problem one that four cafenstroles and bensulfuron-methyl (or pyrazosulfuron, or cinosulfuron) exist is that to kill the grass spectrum wide inadequately, and every kind of weed killer herbicide list usefulness all has the part weeds effectively not remove; Two is four cafenstrole production cost height, and by independent using dosage, farming is originally at 8 yuan/mu; The 3rd, the peasant uses two kinds of weed killer herbicides with in use, and then for using method, key points for operation etc. are difficult to again grasp when using with, actual being difficult to promotes.

The present invention seeks to shortcoming, a kind of composite herbicide is provided, can enlarge and kill the grass spectrum, herbicidal effect is good, safe in utilization and can effectively reduces farming originally at prior art.For achieving the above object, through test in a large number, obtained this Herbicidal composition.Its centre point is that four cafenstroles are re-dubbed preparation with a kind of sulfonylurea herbicide (in bensulfuron-methyl, pyrazosulfuron or the cinosulfuron any), and the two effective ingredient weight ratio is: 0.5～30: 1.After containing above two kinds of active ingredients, add proper assistant, can be processed into the extensive stock preparation, as aqueous suspension agent, wetting powder, tablet, water dispersible granules, granule etc.

Advantage of the present invention and remarkable result:

1, activity of weeding height

Just can prevent and kill off 2 leaf phases barnyard grass grass, moleplant seed and annual nutgrass flatsedge in the past with low consumption, and annual broadleaf weed is had fine preventive effect.

2, safety is good

Can in all types of paddy fields such as live field, rice seedling bed, seedling throwing field, transplant field, use.

3, the lasting period is long

Lasting period can reach more than 40 days, and a drug can be prevented and kill off the paddy field crop smothering in the time of infertility, and second stubble crop is had no effect.

4, killing grass composes wider

This medicament has remedied the careless defective of killing of single agent separately, complements one another, and a drug just can remove the crop smothering of all kinds of weeds in paddy field.Particularly, has fabulous preventive effect for the difficult moleplant seed of preventing and kill off of other medicaments.

5, it is very stable to kill careless effect

Problems such as this medicament can be owing to soil condition, water layer management, leak, spilling water influence activity of weeding, and it is very stable to kill careless effect.

6, easy to use

This medicament can adopt corresponding pesticide-clay mixture, mispickel according to field water regime and each department custom, medicine is fertile or convert several different methods such as water spray and carry out dispenser, and fool proof to user and environment.

7, reduce dosage, effectively reduce farming originally

This medicament is after composite, and its dosage significantly reduces than each single agent dosage.Reduce to 5 gram effective ingredient/mus as four cafenstroles from 8～12 gram effective ingredient/mus of single usefulness, bensulfuron-methyl is reduced to 1.2 gram effective ingredient/mus from 1.5～2.0 gram effective ingredient/mus of single usefulness, pyrazosulfuron is from 1.0～1.5 gram effective ingredient/mus of single usefulness, reduce to 0.8 gram effective ingredient/mu, cinosulfuron is reduced to 1.1 gram effective ingredient/mus from 1.3～2.0 gram effective ingredient/mus of single usefulness.Make every mu of total drug cost descend about 20～30%.

Dosage and herbicidal effect that attached 2000 years are singly used and use with separately about above-mentioned several medicaments.

Medicament	Mu consumption/gram (effective ingredient)	Herbicidal effect (behind the medicine 30 days, fresh weight preventive effect): %
						Grass family	Broadleaved herb	Sedge family	Total grass
		Four cafenstroles	????8	????94.2	????62.3					??65.4	??70.2
????12	????100					????75.2	??76.3	??80.5
			Bensulfuron-methyl	????1.5	????16.3				????90.4	??92.0	??48.5
????2.0	????22.9	????98.4				??98.6	??62.4
				Pyrazosulfuron	????1.0			????18.7	????92.5	??91.6	??57.5
????1.5	????23.6	????99.1	??98.5			??65.7
					Cinosulfuron		????1.3	????22.3	????91.8	??94.6	??53.9
????2.0	????25.6	????98.5	??100	??59.8
						Four cafenstroles+bensulfuron-methyl	????5.0+1.2	????94.2	????92.3	??93.6	??93.5
Four cafenstroles+pyrazosulfuron	????5.0+0.8	????94.5	????92.2	??93.5	??93.7
						Four cafenstroles+cinosulfuron	????5.0+1.1	????94.0	????92.5	??94.6	??94.0

Under the situation of light cultivation technology fast developments such as live, rice transplanting in recent years, this medicament since its use wide model, broad weed-killing spectrum, herbicidal effect good, to characteristics such as rice safeties, will receive much concern, have the vast market popularizing application prospect.

The present invention program's embodiment:

1, each component percentage by weight of the present invention, practical formulation embodiment are: (annotate: sulfonylurea herbicide: in bensulfuron-methyl, pyrazosulfuron or the cinosulfuron any)

Embodiment one (wetting powder) embodiment two (water dispersible granules)

Four cafenstroles, 40% 4 cafenstrole 2%

Sulfonylurea herbicide 10% sulfonylurea herbicide 10%

Neopelex 6% F-F glue 0.5%

Lauryl sodium sulfate 1% colouring agent 2%

Sodium lignin sulfonate 6% polyvinyl alcohol 5.0%

Alkylphenol-polyethenoxy base ether 2.0% Nekal BX 6.0%

White carbon 10.0% white carbon 10.0%

Diatomite is supplied No. 1 soil in 100% Jiangsu and is supplied 100%

Embodiment three (tablet) embodiment four (aqueous suspension agents)

Four cafenstroles, 100% 4 cafenstrole 30%

Sulfonylurea herbicide 1% sulfonylurea herbicide 2.0%

Enuatrol N-methyltaurine 4% succinic acid dialkyl phenol sodium sulfonate 3.0%

Tartaric acid 20% polyoxy ethyl styrene base ether polymer 2.5%

Sodium bicarbonate 19.8% ethylidine glycol monoethyl ether 5.0%

Anhydrous sodium sulfate 30% glycerine 5.0%

Magnesium stearate 2.0% sodium phosphate trimer 1.0%

Lactose benefit to 100% deionized water supplies 100%

Embodiment five (water dispersible granules)

Four cafenstroles 50%

Sulfonylurea herbicide 2.0%

Naphthalenesulfonic acid-formaldehyde condensate 20%

Lignin sulfonic acid calcium salt 12%

Polyvinylpyrrolidone (PVP) 5.0%

Pyrolytic silicic acid 0.5%

Bentonite supplies 100%2, effective ingredient using dosage scope (unit: gram/hectare)

Four cafenstroles are: 4～15

Bensulfuron-methyl is: 15～45

(or pyrazosulfuron is: 10～40)

(or cinosulfuron is: 12～45)

Embodiment is as follows:

1???????2???????3???????4???????5

Four cafenstroles 4.0 7.0 10.0 12.0 15.0

Bensulfuron-methyl 40.0 35.0 30.0 25.0 20.0

(or pyrazosulfuron 35.0 30.0 25.0 20.0 15.0)

(or cinosulfuron 40.0 35.0 30.0 25.0 20.0)

Claims (1)

1, the composite herbicide that is used for the rice field, it is characterized in that comprising two kinds of active ingredients, i.e. four cafenstroles and a kind of sulfonylurea herbicide (any in bensulfuron-methyl, pyrazosulfuron or the cinosulfuron), wherein the weight ratio of active ingredient four cafenstroles and sulfonylurea herbicide (any in bensulfuron-methyl, pyrazosulfuron or the cinosulfuron) is: 0.5～30: 1.