JPH0818923B2 - Herbicide application method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for spraying a paddy field with a herbicide during rice planting work.

[Conventional technology]

In the past, paddy field herbicides have generally been difficult to completely control weeds by spraying only once, and at the same time as rice planting work, a herbicide with relatively low herbicidal performance that does not adversely affect the initial growth of seedlings is sprayed. A few days to ten days after planting the rice, a herbicide having a high herbicidal performance as disclosed in, for example, Japanese Patent Publication No. 56-9488 was sprayed on the paddy fields.

[Problems to be Solved by the Invention]

However, the conventional method as described above requires two times of spraying work, that is, the weeding spraying work performed at the same time as the rice planting work and the subsequent spraying work, which is troublesome, and improvement in this point has been desired.

The present invention aims to solve the above problems.

[Means for solving the problem]

A feature of the present invention is that a slow-acting herbicide with high herbicidal performance and a fast-acting herbicide with low herbicidal performance are sprayed on a field at the same time as planting work of seedlings, and the action and effect are as follows. .

[Work]

In other words, in the period when the planted seedlings are not growing immediately after rice planting, a herbicide with fast-acting and low herbicidal action acts, so that weeding is performed without adversely affecting weakly seedlings immediately after planting. Can be done. Then, after the planted seedlings have grown to some extent and their vitality has been sufficiently enhanced, the herbicide having a slow-acting property and high herbicidal properties starts to act.

〔The invention's effect〕

Therefore, according to the present invention, 1
Only by spraying the herbicide twice, the effective weeding function could be achieved for a long period of time, and the work load was reduced.

〔Example〕

 Examples will be described below.

FIG. 2 shows a rice transplanter equipped with the herbicide spraying device (1). This rice transplanter connects a seedling planting device (3) to a rear part of a riding type traveling body via a link mechanism (not shown) so as to be able to move up and down, and at the rear of the seedling planting device (3), a fertilizer is applied. An apparatus (22), an insecticide spraying apparatus (4) for spraying an insecticide for exterminating harmful insects, and the herbicide spraying apparatus (1) are arranged side by side in the front and rear.

The seedling planting device (3) is a rearward and downward inclined seedling placing table (5) which is driven to reciprocate left and right with a constant left and right stroke, and each seedling is cut out from the lower end of the seedling placing table (5) and planted. The insecticide spraying device (4) is composed of a planting mechanism (6), a planting transmission case (7) also serving as a blem connected to the link mechanism (not shown), a grounding float (8), and the like. The herbicide spraying device (1) is configured to be connected and supported by a frame (9) extending upright from the planted transmission case (7).

The insecticide spraying device (4) is provided with a hopper (10) for storing the insect repellent in the lateral center of the upper portion, and a feeding mechanism for lowering the insect repellent downward by a predetermined amount under the hopper (10). (11) are provided in series, and further, a lower portion thereof is provided with a substantially box-shaped guide member (12) formed to be long in the lateral direction over substantially the entire planting width. Then, the guide member (12) is provided while the insecticide which has been fed out from the feeding mechanism (4) and dropped is splashed off by the rotary blade (13).
It is configured to be diffused over almost the entire area. Further, as shown in FIG. 3, a downflow pipe (14) is attached to the lower part of the guide member (12) to separate and guide the insect repellent diffused for each planting line into the mud surface, At the lower end of the downflow pipe (14), a grooving device (15) for forming a groove for embedding the insect repellent on the mud surface is attached.

The herbicide spraying device (1) includes a hopper (16), a feeding mechanism (17) and a guide member (18) similar to the insecticide spraying device (4), and the lower side of the guide member (18) is the entire area. It is formed in an open state, and the herbicide diffused by the rotary blade (19) is configured to drop and be sprayed on the water surface in the diffused state.

In the hopper (16), a slow-acting herbicide (a) having a high herbicidal performance and a fast-acting herbicide (not shown) having a low herbicidal performance are mixed and stored, and both the herbicides are stored. The seedlings are sprayed on the field at the same time when the seedlings are planted.
Examples of the fast-acting herbicide with low herbicidal performance include N-
(2-Mercaptoethyl) -benzenesulfonamide-
S- (0.0 diisopropyl phosphorodithioate) (hereinafter abbreviated as "Benslide") or the like is used. Examples of the delayed-acting herbicide (a) having high herbicidal performance include, for example, the above-mentioned Benthlide, ethyl 2-methyl-4-chlorophenoxybutyrate and 2-methylthio-4,6-bisethylamino-.
S-triazine was added in the form of granules, and as shown in FIG. 1, the high-performance granular herbicide (20)
The outer surface of the membrane is coated with an elution membrane (21) made of paraffin or the like and easily weathered.

When the above herbicides are sprayed at the same time as the rice planting work, for the seedlings that have not grown immediately after rice planting,
Since the high-performance granular herbicide (20) is covered with the coating material, it does not dissolve and act, but only the low-performance herbicide (Benslide) acts. Then, several days after rice planting, the elution membrane (21) is weathered and elutes, and the high-performance herbicide (20) starts to act. At this time, the seedlings are growing and vitality is increased, and resistance to the drug is increased. Because it has power, it does not have an adverse effect.

In this way, it is sufficient to apply the herbicide at the beginning and middle of the growing period of seedlings only once at the time of planting rice, and the labor of the work can be omitted twice.

[Other Examples] The high performance herbicides are not limited to those shown in the above examples, and various other herbicides may be used.

The elution membrane (21) is not limited to paraffin and may be soil or another synthetic resin that is easily assimilated.

Further, the elution membrane (21) is not limited to one layer of the same substance, but two or more layers of different substances may be provided.

The present invention is applicable to fertilizers other than herbicides, and may be carried out by mixing herbicides, fertilizers or other chemicals.

Further, the onset of action of the delayed-release herbicide can be carried out even for a long-term one such as 10 days to 1 month and a half.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a method for spraying a herbicide according to the present invention. Fig. 1 is a cross-sectional view of a slow-acting herbicide with high herbicidal performance, Fig. 2 is a side view of the rear part of a rice transplanter, and Fig. 3 is a spray of insecticide. It is a rear view of an apparatus. (A) ... High-performance delayed-acting herbicide.

Claims (1)

[Claims] 1. A herbicide spraying method which comprises spraying a slow-acting herbicide (a) having a high herbicidal performance and a fast-acting herbicide having a low herbicidal performance onto a field at the same time when planting seedlings.