JPS5826884B2 - lawn herbicide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a herbicide for lawns, and more specifically to a selective herbicide for effectively controlling annual weeds that occur in lawns, especially in Korai lawn fields, without causing any harm to the lawn. be.

In recent years, the creation of lawns mainly made of Korai grass has become popular, and the issue of weeding has come into focus in terms of maintenance and management.

Currently, to solve these problems, hand control or the application of herbicides is being carried out.

However, removing weeds by hand requires a great deal of expense, and there are many problems when applying herbicides, such as chemical damage to Korai grass and a narrow herbicidal spectrum.

The present inventors have completed the present invention as a result of continuing to search for chemical weeding methods for effectively controlling various weeds that occur in lawns.

The herbicide for lawns of the present invention contains 2-chloro-4-ethylamino-6-ipropylamino-5-)IJ azine (hereinafter referred to as atrazine) and 3-isopropyl-IH-2.1.
3-Benzothiadiazin-4-(3H)-one-2.2
- Dioxide (hereinafter referred to as bendazone) or a salt thereof as an active ingredient.

Examples of pentacine salts used in the lawn herbicide of the present invention include alkali metal salts such as sodium and potassium salts, amine salts, and alkylamine salts.

The herbicide for lawns of the present invention is made into a powder by adding a filler such as bentonite, clay, talc, white carbon, diatomaceous earth, etc. to these atrazine, pentacine, etc., or if necessary, alkylbenzene sulfonate, polyoxyethylene, etc. It can be used by blending surfactants such as alkyl allyl ether, holvinyl alcohol, and lignin sulfonate into wettable powders, fine granules, or granules.

It is also possible to form an emulsion by adding a solvent and a surfactant.

When used, apply directly or diluted.

Furthermore, atrazine, pentacine, etc. can be prepared separately and mixed and applied at the time of use.

From various repeated experiments, the effective mixing ratio of the lawn herbicide of the present invention is 1 part by weight of atrazine to 1 part by weight of pentacines.
The range is from 0 to 0.1 parts by weight, preferably from 3 to 0.3 parts of pentacines to 1 part by weight of atrazine.

Atrazine inhibits weed germination by treating it during the germination period, and its action is due to photosynthesis inhibition.

Atrazine is used as a field herbicide for soil treatment after sowing corn, etc., but the present inventors have recognized that it is significantly less harmful to Korai grass.

Furthermore, since atrazine has a relatively high water solubility, it gradually moves downward from the soil surface layer, diluting the treated layer and allowing weeds to grow (short residual effect period).

On the other hand, pentacines have a herbicidal effect on broad-leaved and Cyperaceae weeds, but have extremely low selectivity against Poaceae weeds.

It is absorbed into weeds from both the roots and leaves, but because its water solubility is extremely high at 500 ppm, it is easily washed away in the soil and has a short residual effect period.

In the treatment of broad-leaved weeds during the growing season, it is possible to kill them when they have only 2 to 4 leaves, but weeds with advanced growth are only slightly damaged and are not expected to be completely killed.

The effect of the lawn herbicide of the present invention obtained by mixing these two components is not merely additive or complementary, but is due to a clear synergistic action.

The herbicidal effects of the lawn herbicide of the present invention, which is a mixture of these two agents in an appropriate ratio, are as follows.

■ Expression of herbicidal activity is significantly accelerated by treatment during the growing season.

■ A weed-killing effect can be obtained during the mid-to-late stages of growth.

■ Although each single agent has a narrow herbicidal spectrum, it can control a wide range of grass species.

■ The period of suppression of weed germination is prolonged.

This is thought to be due to the herbicidal properties of both sides skillfully working together to create synergy.

For example, the herbicidal effect on the broad-leaved weed grasshopper was 38% and 26.4% when treated with 50g/10A of atrazine and Pentacine 1001, respectively, but when these were mixed, the effect was 100%.

Furthermore, although both atrazine and pentacine have a weak weed control effect, when both are combined, a significantly high herbicidal effect is exhibited.

Example 1 Powder An equal mixture of 3% atrazine, 3% pentacine, talc, and kaolin (94%) is uniformly mixed and ground to obtain a powder.

When using, sprinkle directly. Example 2 Wettable powder atrazine 25%, pentacine 25%, diatom ±44%,
A wettable powder is prepared by uniformly mixing and pulverizing 2% white carbon, 2% polyoxyethylene alkylphenyl ether, and 2% sodium lignin sulfonate.

Example 3 Wettable powders atrazine 12.5%, pentacine Na salt 25%, diatomaceous earth 56.5%, white carbon 2%, polyoxyethylene alkylphenyl ether 2%, and lignin sulfonate sodium 2% were uniformly mixed and ground. and use it as a hydrating agent.

Example 5 Wettable powder atrazine 12.5%, pentacine salt 25%, diatomaceous earth 56.5%, white carbon 2%, polyoxyethylene alkylphenyl ether 2%, and lignin sulfonate sodium 2% were uniformly mixed and ground. and use it as a hydrating agent.

The above hydrating agents are appropriately diluted with water before use.

Example 4 Granules 5% atrazine, 10% pentacine, 46% talc, 30% bentonite, 5% white carbon, 2% alkylbenzenesulfonic acid 7-da, and 2% sodium ligninsulfonate were mixed and ground, and 25% water was added. The mixture is kneaded and granulated using an extrusion granulator, followed by drying to form granules.

When using, sprinkle directly.

Experimental example 1 Field soil was put into a 15 cIfL pot with a diameter of 15 cIfL, and seeds of crabgrass, goldenrod, whitegrass, and Japanese oak were sown on the topsoil.
It was mixed into a layer of CrrL.

In addition, two plants of Korai grass were transplanted.

After 20 days, at the 4-leaf stage of crabgrass, when the plant height of the Japanese grasshopper, white locust, and Japanese knotweed was 7 crrL, the prescribed dosages of atrazine (hydrating agent), pentacine (hydrating agent), and the composition of the present invention (hydrating agent) were administered in 1 section of 2 Tnl. It was diluted with water and spread evenly.

In the investigation, the above-ground weight was measured two weeks after treatment and expressed as the untreated ratio.

Regarding the Korai grass, the general condition of withering was visually observed.

Experimental Example 2 Field soil was placed in an 800 cd vat, and after being lightly compressed, the prescribed amounts of atrazine (hydrating agent), pentacine Na salt, and the composition of the present invention (hydrating agent) were diluted with 5 rrL of water and spread uniformly over the surface. was dispersed.

Thereafter, seeds of the broad-leaved weed pigweed were sown at intervals of 5 days, and the residual effect was detected.

In the investigation, the above-ground fresh weight was measured 10 days after sowing and expressed as the untreated ratio.

In addition, 100 in the table indicates that the residual effect completely disappeared.

Experimental Example 3 The Korai lawn cultivation area was divided into 1 section 50 crrL x 50 crIL, and the average plant height of Korai grass was 4 crfL, and the average height of the Korai grass was 5 crfL.
．． At the time of 5 crfL, atrazine (hydrating powder), pentacine (hydrating powder), prescribed concentration solution and their mixture were added to 1 section 25
It was diluted in 1 ml of water and spread evenly.

A 3000 times more spreading agent was added to the spray solution.

In the investigation, the mortality rate was evaluated using a 10-point scale 20 days after treatment.

O: Damage dust O 1: Damage dust 0-10% 2: //10~20 3: 〃 20-30 4: //30~40 5:〃 40~50 6:〃50～60 7: 〃 60-70 8: //70~80 9: //80-90 10: // 90-100

Claims (1)

[Claims] 12-chloro-4-ethylamino-6-isopropylamino-S-triazine and 3-isopropyl-IH-2.
1,3-Benzothiadiazin-4-(3H)-one-2
- A herbicide for lawns containing 2-dioxide or its salt as an active ingredient.