JPS593444B2 - Herbicide composition for paddy fields - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new and improved herbicide composition for rice fields, and is specifically represented by the general formula.

However, X represents a hydrogen atom or a halogen atom.

) α-(β-naphthoxy)propionic acid derivatives, 2-methylthio-4,6-bis(ethylamino)
-s-triazine (hereinafter abbreviated as MTET) and the general formula (wherein, X is halogen, R1 and R3 are (C1-C4
)-alkyl, and R2 represents (C1-C4)-alkyl(C1-04)-alkoxy.

) The present invention relates to a herbicidal composition for paddy fields containing the compound shown in (1) as an active ingredient.

Conventionally, herbicides for paddy fields in Japan have been used for initial use,
Herbicides are broadly classified into three types: mid-term herbicides and late-term herbicides, with the former two accounting for the majority of usage.

As a representative herbicide for initial use, M
O (2,4,6-dolychlorophenyl-47-nidrophenyl ether) and Exxgoni (2,4-dichlorophenyl-3'-toxy 4'-nitrophenyl ether), etc., are used as medium-term herbicides. Mamet (S-ethyl-N-N-hexamethylenethiol carbamate and 2-methylthio-4,6-bis(ethylamino)-S
-) riazine) and Saturn 5 (S-(4-chlorobenzyl)-N-N-diethylcarbamate and 2-
and methylthio-4,6-bis(ethylamino)-8-triazine].

However, among these herbicides, early stage herbicides are extremely effective when used at the beginning of weed emergence, but their effectiveness decreases significantly when used during the peak stage of weed emergence, while mid-stage herbicides are effective at the beginning of weed emergence. It is effective from the beginning to the growing season, but if used early after transplanting rice, it causes significant chemical damage to rice, so the period of use is quite limited.

Recently, due to the repeated use of the same chemical, some weeds, especially perennial weeds, have tended to flourish as priority weed species. Paddy rice that is highly effective against perennial weeds, and can achieve the above objectives with a single treatment to avoid environmental pollution due to high dosage application or repeated application several times, and to save labor in farming. It is hoped that a comprehensive control agent with high selectivity for a wide range of applications will be developed.

An object of the present invention is to provide an improved herbicidal composition for paddy fields that exhibits a remarkable herbicidal effect on all plant species with a single application.

Another object of the present invention is to completely safely treat paddy rice with -
An object of the present invention is to provide a herbicidal composition for paddy fields that can control annual and perennial weeds with extremely high control efficiency.

The herbicide composition of the present invention is (b) General formula represents.

However, X is hydrogen or a halogen atom.

] α-(β-naphthoxy)propionic acid derivative represented by (1:I) 2-methylthio-4,6-bis(ethylamino)-8-triaridine, and Cυ general formula [wherein, X is] rogen, R1 and R3 are (C1-C
4)-alkyl, and R2 represents (C,-C4)-alkyl or (CtC4)-alkoxy.

] It contains the compound shown as an active ingredient.

Each of the active compounds contained in the composition of the present invention is known, and the compound represented by the general formula (I) is
No. 14077, a compound represented by the general formula 4 is disclosed in West German Patent No. 2,604,225, and MTET is disclosed in US Pat. No. 2,909,420 as having herbicidal activity.

However, when each of these active compounds is used alone, the herbicidal activity is not always fully satisfactory, the grass species that can be used are limited, the suitable period is also narrow, and phytotoxicity to paddy rice is often observed.

For example, the compound represented by the general formula (I) has a remarkable effect on annual broad-leaved weeds and weeds, but has almost no effect on grass grass weeds.

■TT is effective against wild grasses and annual broad-leaved weeds, but it is insufficiently effective against perennial weeds, and there is concern about chemical damage to paddy rice depending on when it is used.

In addition, while the compounds represented by the above general formulas are effective against well-grown wild grasses, they are hardly effective against broad-leaved weeds.

Although each of the active compounds has excellent properties as described above, if each is used alone, it is impossible to completely control all weeds.

The active compound composition according to the invention not only complements weeds that are difficult to control with the individual active compounds, but also controls annual weeds as well as recent weeds in small doses that cannot be controlled by each active compound alone. It also shows a remarkable control effect on the perennial weeds that are becoming more frequent, such as porcupine, scallops, cypress, and cypress, and this is clearly due to the presence of a strong synergistic effect among the three types of compounds mentioned above. This indicates that the

Moreover, it has excellent selectivity and does not cause any chemical damage to paddy rice during the entire period from the early stage after rice planting to the growing season.

Although the herbicidal compositions according to the invention exhibit a particularly strong synergistic effect in certain composition ratios, the mixing proportions of the three active compounds may vary within a fairly wide range.

MTE per 1 part by weight of the compound represented by general formula [I]
Appropriate amounts are 0.5 to 0.2 parts by weight of To and 0.1 to 0.5 parts by weight of the compound represented by the general formula.

The compounds represented by the general formula [I] and the compounds represented by the general formulas used in the herbicide of the present invention are specifically illustrated below.

The compound represented by formula (T') The composition of the present invention is most effectively formulated into granules for use.

That is, the active compound is increased in weight using bentonite, clay, melk, limestone, etc., a binder such as sodium ligninsulfonate, polyvinyl alcohol, or sodium alkylbenzenesulfonate is added, kneaded with water, extrusion granulated, and dried. Most preferably, it is formulated into granules by a method or a method in which the compound is dissolved in an appropriate solvent and uniformly adsorbed onto granular diatomaceous earth, vermiculite, or the like.

The granules are uniformly dispersed by hand, from the ground using a granulator, or from the air using a helicopter.

In addition to granules, it may be formulated into wettable powders or powders, and may be diluted with water or sprayed directly.

Furthermore, it is also possible to use them in combination with insecticides, fungicides, or other herbicides, or to formulate formulations, if necessary.

Next, examples of the present invention will be given, but the present invention is not limited thereto.

Example 1 [Granules] 17 parts of compound, 1 part of MTET, 3 parts of compound A, 60 parts of bentonite, 25 parts of talc, 1 part of sodium dodecylbenzenesulfonate, 1 part of polyoxyethylene alkyl allyl ether, and 2 parts of sodium ligninsulfonate. After mixing, an appropriate amount of water is added and kneaded, followed by granulation using a granulator in a conventional manner to obtain 100 parts of granules.

Example 2 [Granules] 210 parts of compound, ■: 1.5 parts of 'ET, 84 parts of compound,
After mixing 50 parts of bentonite, 31.5 parts of Merck, 2 parts of alkylnaphthalene sulfonic acid condensation part, and 1 part of dioctyl sulfone succinate, an appropriate amount of water is added and kneaded, and the mixture is granulated using a granulator in the usual manner. Grind to obtain 100 parts of granules.

Example 3 [Granule] 38 parts of the compound, 2 parts of MTET, 02 parts of the compound, 55 parts of bentonite, 30.5 parts of clay, 2 parts of sodium alkylbenzenesulfonate and 0.5 part of polyvinyl alcohol were uniformly ground and mixed, and then Add an appropriate amount of water and knead 1, then granulate using a granulator in the usual manner to obtain granules 10
Get 0 copies.

Example 4 [Powder] 25 parts of the compound, 5 parts of MTETo, 1 part of the compound A, and 93.5 parts of the diatomaceous clay mixture are mixed and ground to obtain 100 parts of the powder.

Example 5 [Irrigation agent] 140 parts of the compound, 3 parts of MTET, 87 parts of the compound, 8 parts of white carbon, 37 parts of diatomaceous acid, 3 parts of sodium ligninsulfonate, and 2 parts of sodium dodecylbenzenesulfonate were mixed and ground and hydrated. 100 parts of the agent are obtained.

Hereinafter, the effects of the present invention will be specifically explained using test examples.

Test Example 1 [Herbicidal effect test at the beginning of weed germination] Fill an A/2000 Wagner pot with 11 kg of paddy soil, and add 1 k each of N, P2O5, and N20.
g was applied to the entire layer with a chemical fertilizer, and an appropriate amount of water was added and thoroughly stirred to create a stagnant state.

2 of paddy rice seedlings (leaf age 2.5) grown in advance in a greenhouse
One plant was used, and two plants per pot were seeded at a depth of 2 mounds, and seeds of Japanese grasshopper, Japanese cypress, Japanese cypress, Japanese firefly, and Helaomodaka were sown into the seedlings.

In addition, we transplanted the tubers of Urikawa, Mizugayatsu, and Kurogwai, and the overwintering buds of Matsubai to a water depth of 3 cr.
The cells were grown in a greenhouse while being maintained at IL.

Three days after the seedlings, a predetermined amount of the test compound was applied at the beginning of weed germination.
The treatment was carried out using granules prepared according to the method shown in the above examples.

After the treatment, water leakage of 1 cIfL/day was given for 7 days.

One month after the chemical treatment, the herbicidal effect and chemical damage to paddy rice were investigated, and the results are shown in Table 1.

In this table, the herbicidal effect on each grass species is expressed using a 10-level numerical value from "0" to "9" according to the following guidelines, and the degree of chemical damage to paddy rice is indicated as "severe damage" or "human damage". , ``Used,'' ``Small book,'' ``Minor harm,'' and ``Harmless.''

Test Example 2 [Herbicidal effect test during the weed growing season] A suitable amount of paddy soil containing seeds and tubers of year-round and perennial weeds of paddy fields was poured into a concrete pot of size 50cr/L x 50crfL x 50crfL, and
The entire layer was fertilized with 31 each of N, P2O5, and K20 using chemical fertilizers to create a water-filled condition.

To this, paddy rice seedlings with leaf age of 2.5 were transplanted, 2 per plant, and 4 plants per pot at equal intervals.

17 days after rice planting, a predetermined amount of the test compound was treated under stagnation using granules prepared according to the method shown in the above example.

One month after the chemical treatment, the herbicidal effect and chemical damage to paddy rice were investigated, and the results are shown in Table 2.

In this table, the classification of herbicidal effects and the degree of chemical damage to paddy rice is in accordance with Table 1.

The sump water depth in the concrete pot during the test period was 3 crr.
After the chemical treatment, water leakage of 1 crfL/day was given for 7 days.

Test Example 3 [Field test] A paddy field containing a large number of common weeds was plowed, fertilized (1 kg/a each of N, P2O5, and K20), plowed, and leveled using the usual methods. 2.5m x 4m
), and two paddy rice seedlings with a leaf age of 2.5 were transplanted into this as one plant at a furrow spacing of 30 crIL and a tillage spacing of 15 crfL.

After transplanting, while keeping the water depth at 3 to 5 crIL, weed germination start period (3 days after rice planting) and the rice millet at 3.0 to 3.0 cr IL.
At the 5th leaf stage (15 days after rice planting), a mixture or single granule of the test compound prepared according to the method shown in the above example was sprinkled by hand.

In addition, commercially available MO granules-9 and Saturn S granules were used as control drugs.

The amount of weeds one month after spraying and the yield of paddy rice four months after spraying were investigated and the results shown in Table 3 were obtained.

The excellent synergistic effect brought about by the herbicidal composition of the present invention can be fully understood from the herbicidal effects shown in the above test examples, and will be explained in more detail below using firefly as a representative weed.

The following method is usually used to test for interaction between any combination of three herbicides.

(S, R, Colby,,” Calculating
Synergisticand Antagonis
tic Re5ponses of Herbicid
eCombinations “Weed 15.2O
-22 (1973)).

X- Herbicide A p? / a Damage when using %Y-
Q herbicide B? % damage when using /a Z - % damage when using herbicide C at rP/a E - Expected % damage when using herbicides A, B and C in combination with plq and rP/a, respectively It is.

If the measured actual damage exceeds the calculated expected damage, this indicates that synergy exists in the herbicidal composition.

The results of testing the interaction of the herbicide composition of the present invention are shown below using test examples.

Test Example 4 [Interaction Verification Test] Fill an a/10,000 pot with 1 kg of paddy soil, and fertilize the entire layer with a chemical fertilizer containing 0.3 P each of N, P2O3, and Ni20.

After seeding a certain amount of firefly seeds and covering with soil,
Gently add an appropriate amount of water to make it hydrated.

When the firefly reached a predetermined growth level, a predetermined amount of the test compound was treated with water using an irrigation agent prepared according to the method described in Example 5 above.

After 20 days of treatment, the firefly was taken out and the air-dried mold was measured.
It was evaluated based on % damage compared to the untreated control area, and the results are shown in Table 4.

The measured and calculated values in this table are as follows.

0% = No activity 100% - Complete extermination As is clear from the above results, the composition of the present invention has no effect on paddy rice when used at any time from the beginning of weed germination to the peak of weed growth immediately after rice planting. are harmless.

Moreover, due to the synergistic effect of the three types of chemicals, all weeds can be controlled in a single application using small doses that cannot be controlled with individual chemicals, which is preferable from the perspective of environmental pollution, and is used more frequently than before. Significantly superior to herbicides.

Claims (1)

[Claims] 1 @) Represents a general formula. However, X is hydrogen or a halogen atom. ], (b) 2-methylthio-4,6-bis(ethylamino)-s-triaridine, and C→ general formula [wherein, X is halogen, R1 and R3 is (C1-C4
)-alkyl, and R2 represents (CI C4)-alkyl or (C1-C4)-alkoxy. ] A herbicide composition for paddy fields, characterized by containing the compound represented by the following as an active ingredient.