JPH0769811A - Algicide - Google Patents

Abstract

PURPOSE:To obtain an algicide to be used in laver culture, comprising an aqueous solution containing acid acid(s) selected from organic acids, phosphoric acids and polyphosphoric acids and salt(s) selected from the respective organic acids, phosphoric acids and polyphosphoric acids. CONSTITUTION:This algicide comprises an aqueous solution containing at least kind of acid selected from 1-4C organic acids, phosphoric acids and polyphosphoric acids and at least one kind of salt selected from the respective 1-4C organic acids, phosphoric acids and polyphosphoric acids and is characterized by being used after adjusted its pH value to >4.0 and <=6.0. By combining the component A with the component B, the drawbacks involved in conventional acid treating agents, is abviated and the problems of marine pollution are eliminated, and the productivity of layer culture and also the quality of cultured layer are improved, thus this algicide is considerably beneficial to the laver culture industry.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel algicidal agent for controlling the growth of dirt and algae that occur during the cultivation of seaweed. More specifically, when seaweed is cultivated, it removes common algae such as blue-green algae, sea bream, and diatoms that frequently occur in the sea area of culture, and prevents diseases such as reddening, and at the same time removes dirt from the leaves. The present invention relates to a novel algicidal agent that does not prevent the growth of seaweed during the culture process.

[0002]

2. Description of the Related Art Conventionally, the mainstream method is to use an acid treatment agent which is an aqueous solution of organic acid or phosphoric acid as an algicidal agent, and dip the seaweed net in the aqueous solution for a certain period of time to algae algae.

When treating seaweed net with a conventional acid treating agent,
Generally, an acid treatment agent is diluted with water or seawater before use.
The diluting solution has a pH of about 2 to 3 and is subjected to a dipping treatment for a relatively short time. The relationship between pH and treatment time is
It is necessary to adjust so that weeds can be removed and the seaweed can survive.

[0004]

However, when the seaweed net is treated at such a low pH, there is a delay in the growth of seaweed buds and a decrease in productivity as well as the removal of weeds and the like. There is. In order to suppress this, in the case of normal acid treatment, it is necessary to keep the pH at least at least 2.7, so the amount of the acid treating agent or the active ingredient in the acid treating agent used is also limited. As a result, a sufficient effect was not obtained. Also, a lower pH, eg pH 1.0
Even when the treatment is carried out for an extremely short time of about 2.0, it is inevitable that the growth of seaweed sprouts is delayed and the productivity is lowered.

[0005]

Means for Solving the Problems The inventors of the present invention have made extensive studies in order to solve the above problems in the cultivation of seaweed, and as a result, have been selected from the group consisting of organic acids, phosphoric acid and polymerized phosphoric acid. When using an aqueous solution containing at least one acid and at least one salt selected from the group consisting of organic acid salts, phosphoric acid salts, and polymerized phosphoric acid salts, when used, By adjusting to a high pH and using it, it is possible to treat seaweed nets and the like in a short time, and thus, without disturbing the growth of seaweed buds,
The present invention was completed by discovering that soil of nori and nori nets can be removed and growth of weeds can be controlled to remarkably improve productivity and workability.

That is, the present invention provides a salt of at least one acid selected from the group consisting of organic acids having 1 to 4 carbon atoms, phosphoric acid and polymerized phosphoric acid, and organic acids having 1 to 4 carbon atoms,
An aqueous solution containing at least one salt selected from the group consisting of salts of phosphoric acid and salts of polymerized phosphoric acid, preferably at least one acid selected from the group consisting of organic acids having 1 to 4 carbon atoms. And an aqueous solution of at least one salt selected from the group consisting of organic acid salts having 1 to 4 carbon atoms, and more preferably at least one salt selected from the group consisting of lactic acid and lactic acid salts. Which comprises an aqueous solution in which the salt is a sodium salt or a potassium salt, and which is used by adjusting the pH of the aqueous solution to more than 4.0 and 6.0 or less. The purpose is to provide an algaecide that can be used.

Another object of the present invention is to use at least one acid selected from the group consisting of the above-mentioned organic acids, phosphoric acid and polymerized phosphoric acid, and salts of the above-mentioned organic acids, salts of phosphoric acid and polymerized phosphoric acid. At least one selected from the group consisting of adipic acid, sorbic acid and salts of these acids is added to a component containing an aqueous solution consisting of at least one salt selected from the group consisting of salts of acids. More effectively achieved with algae.

[0008]

The following is a detailed description of the algicidal agent of the present invention.

The aqueous solution used in the present invention has 1 carbon atoms.
To at least one acid selected from the group consisting of organic acids, phosphoric acid and polymerized phosphoric acid, and a group consisting of salts of organic acids having 1 to 4 carbon atoms, salts of phosphoric acid and salts of polymerized phosphoric acid. Consisting of at least one salt selected from
Preferably, it is at least one acid selected from the group consisting of organic acids having 1 to 4 carbon atoms and at least one salt selected from the group consisting of salts of organic acids having 1 to 4 carbon atoms. In preparing an aqueous solution with at least one acid selected from the group consisting of phosphoric acid and polymerized phosphoric acid, and at least one salt selected from the group consisting of salts of phosphoric acid and salts of polymerized phosphoric acid, This is because the substances in the system may contribute to the phenomenon of eutrophication of seawater and the like, which is not necessarily preferable.

Examples of the organic acid having 1 to 4 carbon atoms include formic acid, acetic acid, propionic acid, butyric acid, oxalic acid, succinic acid,
There are maleic acid, fumaric acid, citric acid, tartaric acid, lactic acid, malic acid, etc., but when considering odor, workability, biodegradability, or safety, lactic acid is one of the organic acids commonly used as food additives. Is preferred. When used in place of lactic acid, fumaric acid, citric acid, tartaric acid, malic acid, etc. are desirable.

The salts of organic acids having 1 to 4 carbon atoms include monosodium citrate, disodium citrate, trisodium citrate, sodium acetate, sodium hydrogen tartrate, disodium tartrate, sodium lactate,
Organic acid sodium salts such as monosodium malate or disodium malate, monopotassium citrate, dipotassium citrate, tripotassium citrate, potassium acetate,
Organic acid potassium salts such as potassium hydrogen tartrate, dipotassium tartrate, potassium lactate, monopotassium malate or dipotassium malate, ammonium salt of organic acids such as ammonium citrate or ammonium lactate, and the like are preferable, but preferably in lactic acid. It is a mild, weakly acidic or weakly alkaline sodium salt or potassium salt. When used in place of lactic acid, fumaric acid,
Citric acid, tartaric acid, malic acid, etc. are desirable.

Further, salts of the above-mentioned phosphoric acid and polymerized phosphoric acids (hereinafter, also simply referred to as phosphoric acids) include monosodium phosphate, disodium phosphate, trisodium phosphate, disodium pyrophosphate, tetraphosphate pyrophosphate. Sodium or sodium salts of phosphoric acid such as sodium polyphosphate, monopotassium phosphate, dipotassium phosphate,
Examples thereof include potassium salts of phosphoric acids such as tripotassium phosphate, dipotassium pyrophosphate, tetrapotassium pyrophosphate or potassium polyphosphate, and ammonium salts of phosphoric acid such as diammonium phosphate. The polymerized phosphoric acids of the present invention include pyrophosphoric acids, polyphosphoric acids and metaphosphoric acids.

The blending ratio of these acids and salts needs to be appropriately changed depending on the types of the acids and salts, but usually the pH is more than 4.0 and 6.0 or less (hereinafter, simply more than 4.0 to 6). 0.0)), preferably with a pH of more than 4.0
The range is set to 5.0.

For example, when the acid is lactic acid and the salt is sodium lactate as one of the preferred embodiments, the relationship between the concentration of the aqueous solution and the pH of the aqueous solution is as shown in Table 1. The ratio is approximately 30:70 to 5: 9
5, but the pH when mixed with seawater is 4.0
It suffices if it is over 6.0, and it is not necessarily restricted to this mixing ratio.

[0015]

[Table 1]

As described above, since the presence of the salt can provide the buffering ability of the aqueous solution, it is possible to increase the acid concentration in a relatively high pH range.
This is one of the causes of the effectiveness of the algicidal agent of the present invention.

Further, at least one salt selected from the group consisting of salts of organic acids having 1 to 4 carbon atoms, salts of phosphoric acid and salts of polymerized phosphoric acid, which are components of the algicidal agent of the present invention. As described in JP-A-4-311325, it has been found that it has an effect of controlling weeds, or an effect of cleaning soil of laver nets and leaves.

Also, since the salt of the seaweed and the leaves are cleaned by using the salt, the seaweed quickly absorbs the nutrients in the seawater after the seaweed net is stretched on the farm. However, the advantage that the growth of the leaf body becomes faster will be added.

By combining these effects, the algicidal agent of the present invention has an algicidal effect equal to or more than that of the conventional algicidal agent, and at the same time, there is no limitation of working time and the like. Can be used to improve operability and quality of seaweed.

Next, by adding adipic acid, sorbic acid or salts of these acids to the above algicides,
It can have a stronger algicidal effect.

Adipic acid, sorbic acid or salts of these acids are originally used as food additives,
Even when used in the algicidal agent of the present invention, a small amount of addition is sufficient, and the addition amount is selected from the group consisting of the above-mentioned organic acids having 1 to 4 carbon atoms, phosphoric acid and polymerized phosphoric acid. At least one acid and a salt of an organic acid having 1 to 4 carbon atoms,
For at least one salt selected from the group consisting of salts of phosphoric acid and salts of polymerized phosphoric acid, usually 0.5 to
It may be 20% by weight, preferably 1-10% by weight.

The component of the algicidal agent of the present invention has 1 to 1 carbon atoms.
The organic acid, phosphoric acid, polymerized phosphoric acid and salts of these acids of 4 are originally used as food additives and are composed of those whose safety is guaranteed.

Among them, lactic acid, or fumaric acid, citric acid, tartaric acid, or malic acid, which substitutes for lactic acid, is known to have sufficient biodegradation, and in the sea, it can be rapidly treated by the action of microorganisms in seawater. To decompose into
The use of these acids and salts thereof is preferable because there is no fear of causing marine pollution.

The method of using the algicidal agent of the present invention is basically the same as the conventional acid treatment agent. That is, it is possible to consider a soaking process at the larva stage, a plucking process, a soaking process, a spraying process, a soaking process before and after a frozen net is stored.

The amount of the algaecide of the present invention used is, for example, when the seaweed net is immersed in the wash, the algaecide is 2 lactic acid.
In the case of an aqueous solution of 5% by weight and 25% by weight of sodium lactate, this algaecide is usually added to 20 liters per 100 liters of seawater.
˜500 ml, that is, diluted to 0.02 to 0.5% by weight, preferably about 100 to 200 ml, that is, diluted to about 0.1 to 0.2% by weight, and used. When sprayed on a seaweed net at sea, it may be diluted to the same concentration with seawater or the like before use.

When adipic acid, sorbic acid or salts of these acids are included as components, the dilution concentration may be almost the same, and the control effect against weeds, reddish bacteria and the like is further improved.

When the condition of seaweed is strong, it is preferable to dilute the laver to an arbitrary concentration depending on the condition, such that the concentration is twice or three times that of the above example.

[0028]

EXAMPLES The effects of the algicides of the present invention will be shown below with reference to examples.

Example 1 At the time of the development of the larval stage, 200 liters of seawater was charged into a square boat, 400 ml of an aqueous solution containing 15% by weight of lactic acid and 35% by weight of sodium lactate was put therein, and the seaweed net was immersed therein. It was deployed. The pH of seawater in the Kakubune was 4.1.
The time required for development was 10 minutes.

In the seaweed net treated in this manner, the growth of the sprouts was delayed by 2 days or more in the one treated with the conventional acid treatment agent at about pH 2.5, whereas the growth of the sprouts was almost delayed. The healthy buds were raised.

Example 2 200 liters of seawater in a square boat, 13.5 wt% lactic acid, 36.5 wt% sodium lactate and 1 adipic acid
400 ml of a weight% aqueous solution was put therein, and the seaweed net in the germination stage was immersed therein. The pH of the seawater in the Kakubune was 4.2. The immersion time was 10 minutes. With the seaweed net subjected to such a dipping treatment, the seaweed could be plucked 3 days earlier than in the case of the untreated seaweed net that was simultaneously treated.

Example 3 Lactic acid 13.5 was added to 1000 liters of seawater charged in a cage.
When 400 ml of an aqueous solution containing 3% by weight of sodium lactate and 1% by weight of adipic acid was added, and the seaweed net was immersed in it and pulled up in 2 to 3 minutes, the soil of the seaweed net was sufficiently removed. It was confirmed. Then, the net was returned to seawater and pulled up after 3 minutes, and the net was dehydrated, dried and frozen. It was confirmed that the soaking-treated frozen net grows faster in the seaweed sprouts and is less susceptible to disease than the conventional acid-treated frozen net.

[0033]

As described above, in the algicidal agent of the present invention, by combining at least one acid selected from the group consisting of organic acids having 1 to 4 carbon atoms, phosphoric acid and polymerized phosphoric acid, and salts thereof. By overcoming the drawbacks of conventional acid treatment agents, there is no concern about marine pollution, the productivity of seaweed cultivation is improved, and the algaecide that improves the quality of seaweed has been completed. It will bring great benefits to the aquaculture industry.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display area A01N 37:04)

Claims (5)

[Claims] 1. At least one acid selected from the group consisting of organic acids having 1 to 4 carbon atoms, phosphoric acid, and polymerized phosphoric acid, salts of organic acids having 1 to 4 carbon atoms, salts of phosphoric acid, and An algicidal agent comprising an aqueous solution containing at least one salt selected from the group consisting of salts of polymerized phosphoric acid and adjusting the pH to more than 4.0 to 6.0 for use. 2. The aqueous solution contains at least one acid selected from the group consisting of organic acids having 1 to 4 carbon atoms and 1 carbon atom.
The at least one salt selected from the group consisting of the salts of organic acids of 4 to 4, the algaecide according to claim 1. 3. The algicidal agent according to claim 1, wherein the aqueous solution comprises at least one salt selected from the group consisting of lactic acid and salts of lactic acid. 4. The algicidal agent according to claim 1, wherein the salt is a sodium salt or a potassium salt. 5. The algaecide according to claim 1, wherein the aqueous solution is used in combination with at least one selected from the group consisting of adipic acid, sorbic acid and salts of these acids.