CN1134785A - Herbcide composition for rice field - Google Patents

Abstract

The present invention discloses a kind of herbcide for rice field, which uses bensulfuron methyl and isopropyl oxamide as active components to be proportioned rationally, and manifests the outstanding weeding result.

Description

Herbicidal composition for paddy fields

The present invention relates to Herbicidal combinations, particularly the rice field Herbicidal combinations.

Up to now, many herbicides for use in paddy are disclosed.Sulfonylurea herbicide is a kind of of wherein herbicidal effect excellence, but in recent years, owing to use sulfonylurea herbicide continuously, causes the weed community in the paddy field to develop.For example, the main weeds in past paddy field is a barnyard grass grass etc., and sedge weed has also become the main malignant weed in the paddy field now, and the later stage crop smothering has become the formidable enemy of Rice Production.The way that solves, or execute weed killer herbicide or artificial weeding again, this just causes the increase of producing cost, and dispenser for the second time, requires application technique relatively stricter, tends to occur poisoning and produces.

Given this, press for the weed killer herbicide that a kind of disposable dispenser just can be prevented and kill off the whole growing weeds.Thereby the compound ingredients appearred, as among the CN1074086A with the Herbicidal combinations of Bensulfuron-methyl, metsulfuron-methyl and Acetochlor.The weed killer herbicide of the compound preparation of ternary is also disclosed among the CN1092938A.In the above-mentioned patent in the disclosed composition required component more.And the binary Herbicidal combinations of being formed with sulfonyl urea compound and monoacetylaniline compounds is disclosed among the CN1064986, wherein mentioned the binary weeding Herbicidal combinations that bensulfuron-methyl and isopropyl methoxalamine are formed.

Yet, in the Article patent, do not mention sulfonyl urea compound and monoacetylaniline compounds relative scale in described composition, because monoacetylaniline compounds phytotoxicity bigger when using in the rice field to paddy rice, the sulfonyl urea compound of using much amounts could detoxify, and it is active suitable, this is a problem demanding prompt solution, thereby their mutual ratio is vital in composition, from CN1064986A embodiment in disclosed a few concrete ratio, those skilled in the art can not know both safe ratios, and the present invention proposes for dealing with problems just.

Herbicidal combinations of the present invention is an active component with herbicidally effective amount bensulfuron-methyl and isopropyl methoxalamine, and for example the content of active component can account for 0.1-99.9%, and all the other are acceptable carrier on the agrochemistry.

The relative scale of bensulfuron-methyl and isopropyl methoxalamine accounts for 1: 3～8 (weight) in the described composition, is preferably 3: 17.

Composition can be made various formulations, wettable powder for example, dirt agent, granule, suspending agent, emulsion, solution, missible oil and pill etc.But the preferred wet-milling that uses in these formulations.

Carrier in the described preparation is conventional those that use of agrochemical field, filler for example, surfactant, adhesive, emulsifier and solvent etc., example that they are concrete such as white carbon, diatomite, clay, kaolin, talcum, calcium carbonate draws back powder, NNO, sodium alkyl benzene sulfonate, polyvinyl alcohol, starch, OP emulsifier, water etc.

Active component concrete shared ratio in composition is decided according to formulation and operating position, but for example can account for 10-40% in the wet-milling, is preferably 20%, suspending agent, and emulsion and solution can account for 5-60%, are preferably 10-30%.

The invention still further relates to the application of Herbicidal combinations, comprise the present composition from herbicidally effective amount to the rice field that use.Usually the amount of using composition is with every mu of 0.4-3 gram of active component bensulfuron-methyl, and every mu of 3-17 gram of isopropyl methoxalamine is benchmark, but for example 20% wet-milling can be used 35-45 gram/mu.

The present composition is not only to the paddy fields in south china weed control efficacy, and is applicable to that northern rice workspace rice seedling on upland field, dish grow seedlings, the rice transplanting Honda that separation layer is grown seedlings etc., can prevent and kill off barnyard grass grass, convexutricle sedge herb, pondweed effectively, difformed galingale herb, wool felt, Herba Cyperi Glomerati, Drilgrass, Monochoria vaginalis, four leaf vegetables, annual and part grassy weed for many years such as wolf tail grass, broad-leaved and sedge weed, especially to convexutricle sedge herb, eye ear dish (waterborne floating) has special efficacy.

Below the invention will be further described with embodiment.

Embodiment 1

Component content

Bensulfuron-methyl 3 grams

Isopropyl methoxalamine 17 grams

Sodium alkyl benzene sulfonate 5 grams

Diatomite 75 grams

Above-mentioned all the components is added cracker pulverize, mix, can obtain 20% wettable powder.

Embodiment 2

Component content

Bensulfuron-methyl 2.5 grams

Isopropyl methoxalamine 17.5 grams

Sodium alkyl benzene sulfonate 20 grams

OP emulsifier 60 grams

With isopropyl methoxalamine and the bensulfuron-methyl dissolving of small amount of acetone with described amount, add emulsifier and sodium alkyl benzene sulfonate then and mix, promptly get 20% emulsion.

Biologic test

One, test material and method

1. reagent agent: (1) 20% agricultural profit is come the wettable powder (embodiment of the invention 1

Composition)

(2) 72% your (isopropyl methoxalamine) missible oil (Switzerland's vapour all

Ba Jiaji produces)

(3) 10% bensulfuron-methyls (the Jiangsu hormone study is produced)

2. test is handled and method for designing: test establishes that farming is sharp to come mu with 35 grams and two processing of 45 grams, with all you mu 12 milliliters, bensulfuron-methyl mu restrains two processing with 13.3 and compares medicament, and establish not dispenser and make blank, repeat four times, district's group is arranged at random, and the sub-district area is 23 meters ²(5 * 4.6 meters), all dispensers in six days after the early rice transfer are handled in each medication, pour water 3-5 centimetre before the dispenser, and water conservation is 7～10 days behind the medicine, and application method adopts the pesticide-clay mixture method, mixes thin earth by the mu medication and evenly spreads fertilizer over the fields for 10 kilograms.

3. investigation method: after dispenser 15 days, 31 days and 45 days, random sampling 4 points in every sub-district were got 0.25 meter at every ², investigate various weeds strain numbers respectively, and after administration 45 days examination weeds total fresh weights, last statistical computation goes out preventive effect, repeatedly estimates the safety to paddy rice simultaneously after dispenser in one month.

Two. result of the test and analysis

(1) to rice safety: according to repeatedly range estimation, each medication is handled has poisoning to your mu all with 12 milliliters, shows as the minimizing of tillering, plant stunts, other each medication is handled does not all have the poisoning generation, the present composition is described in the consumption of participating in the experiment, and is comparison safety to paddy rice.

(2) herbicidal effect

Overall preventive effect to weeds sees Table 1,2 and 3.Its result shows Herbicidal combinations of the present invention to barnyard grass grass, Monochoria vaginalis preventive effect height, and the longevity of residure is long, especially barnyard grass grass preventive effect is higher than the bensulfuron-methyl that present large tracts of land is used.

Table 1 20% agricultural profit is come 15 days herbicidal effects behind the different amounts medicine

Handle	Repeat	Total weeds		Wherein
								The strain number	Average preventive effect %	The barnyard grass grass		Monochoria vaginalis
		The strain number	Average preventive effect %	The strain number	Average preventive effect %
						The farming profit is come 35 gram/mus	????I ????II ????III ????IV			????0 ????0 ????0 ????0	?100	????0 ????0 ????0 ????0	????100	????0 ????0 ????0 ????0	????100
The farming profit is come 45 gram/mus	????I ????II ????III ????IV	????0 ????0 ????0 ????0	?100	????0 ????0 ????0 ????0	????100			????0 ????0 ????0 ????0	????100
						Your 12ml/ mu all	????I ????II ????III ????IV			????0 ????0 ????0 ????0	?100	????0 ????0 ????0 ????0	????100	????0 ????0 ????0 ????0	????100
Bensulfuron-methyl 13.3g/ mu	????I ????II ????III ????IV	????0 ????0 ????1 ????2	?85.0	????0 ????0 ????1 ????2	????25.0			????0 ????0 ????0 ????0	????100
						????CK	????I ????II ????III ????IV			????7 ????5 ????4 ????4	???/	????1 ????1 ????0 ????2	????/	????4 ????4 ????4 ????1	????/

Annotate: strain number-strain/rice ²

The agricultural profit of table 2 is come 31 days herbicidal effects behind the different amounts medicine

Handle	Repeat	Total weeds		Wherein
								The strain number	Average preventive effect %	The barnyard grass grass		Monochoria vaginalis
		The strain number	Average preventive effect %	The strain number	Average preventive effect %
						The farming profit is come 35 gram/mus	????I ????II ????III ????IV			????0 ????0 ????1 ????2	?96.3	????0 ????0 ????0 ????1	????94.1	????0 ????0 ????1 ????0	????98.2
The farming profit is come 45 gram/mus	????I ????II ????III ????IV	????0 ????0 ????0 ????1	?98.8	????0 ????0 ????0 ????0	????100			????0 ????0 ????0 ????1	????98.2
						Your 12ml/ mu all	????I ????II ????III ????IV			????0 ????0 ????2 ????4	?92.5	????0 ????0 ????0 ????1	????94.1	????0 ????0 ????0 ????2	????92.9
Bensulfuron-methyl 13.3g/ mu	????I ????II ????III ????IV	????2 ????1 ????0 ????1	?95.0	????2 ????1 ????0 ????1	????76.5			????0 ????0 ????0 ????0	????100
						????CK	????I ????II ????III ????IV			????12 ????37 ????23 ????8	???/	????2 ????6 ????4 ????5	????/	????8 ????28 ????17 ????3	?????/

Annotate: strain number-strain/rice ²

The agricultural profit of table 3 is come 45 days herbicidal effects behind the different amounts medicine

Handle	Repeat	Total weeds				Wherein				The anti-survey of taking care of property of aquatic foods imitated fixed showing
											The strain number	Average preventive effect %	Fresh weight (%)	Average preventive effect %	The barnyard grass grass		Monochoria vaginalis
		The strain number	Average preventive effect %	The strain number	Average preventive effect %
						The farming profit is come 35 gram/mus	????I ????II ????III ????IV	?0 ?0 ?1 ?2	??97.5						????0 ????0 ????0.2 ????0.3	??99.3	?0 ?0 ?1 ?1	????87.5	?0 ?0 ?0 ?1	????98.6	????a
The farming profit is come 45 gram/mus	????I ????II ????III ????IV	?0 ?0 ?0 ?0	??100	????0 ????0 ????0 ????0	??100					?0 ?0 ?0 ?0	????100	?0 ?0 ?0 ?0	????100	????a
						Your 12ml/ mu all	????I ????II ????III ????IV	?1 ?1 ?5 ?2	???92.4						????0.4 ????0.15 ????0.6 ????0.2	??98.1	?0 ?0 ?0 ?0	????100	?0 ?0 ?0 ?0	????93.1	????a
Bensulfuron-methyl 13.3g/ mu	????I ????II ????III ????IV	?3 ?1 ?1 ?0	??95.8	????4.1 ????0.5 ????0.4 ????0	??93.1					?3 ?1 ?1 ?0	????68.8	?0 ?0 ?0 ?0	????100	????b
						???CK	????I ????II ????III ????IV	?7 ?37 ?49 ?25	????/						????7.8 ????14.1 ????19.8 ????31	????/	?2 ?3 ?4 ?7	????/	?4 ?31 ?27 ?10	?????/

Annotate: strain number-strain/rice ²

Claims (5)

1. rice field Herbicidal combinations wherein contains the active component bensulfuron-methyl and the isopropyl methoxalamine of herbicidally effective amount, it is characterized in that bensulfuron-methyl and the isopropyl methoxalamine relative scale in composition is 1: 3～8 (weight).

2. according to the composition of claim 1, the ratio that it is characterized in that bensulfuron-methyl and isopropyl methoxalamine is 3: 17.

3. according to the composition of claim 1 or 2, but it is characterized in that its formulation is wet-milling.

4. the application of claim 1 composition is characterized in that being applied to the rice field with the composition of the claim 1 of herbicidally effective amount.

5. according to the application of claim 4, the amount of application that it is characterized in that Herbicidal combinations in every mu of rice field is with bensulfuron-methyl 0.4-3 gram, and isopropyl methoxalamine 3-17 gram is benchmark.