JPH11220963A - Sea laver cultivation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sea lever cultivation method that can control reddish- drown scab, a disease of a sea laver in a shortened time without adverse effect on sea lever itself, by soaking the net for sea lever cultivation by using a solid product formed by compressing a mixture of fumaric acid and sodium chloride. SOLUTION: A solid product prepared by compressing a mixture of fumaric acid and sodium chloride is added to the treatment solution in the course of the sea laver cultivation and the sea lever cultivation nets are soaked in the solution to obtain the objective sea laver cultivation method. This treatment solution is preferably an acidic one having a pH value of 1-5 in this cultivation. Further, the solid product preferably contains <=40% of fumaric acid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a nori cultivation method for improving the quality and processing for eliminating and preventing diseases caused in nori cultivation in a short time.

[0002]

2. Description of the Related Art In the cultivation of laver, the occurrence of red rot fungi degrades the quality of the laver, and if the bacterium becomes severe, there is a risk that production will be completely eliminated. Generally, in seaweed culture, drying is performed as a method for controlling and preventing diseases. This is a method of once drying the laver net out of the seawater and drying it, but this method is not very effective for much labor and time. As another method, there is a method of controlling red rot bacteria by immersion treatment in an organic acid solution such as citric acid and malic acid. The treatment is performed with a 1 to 2% solution of citric acid for 5 to 10 minutes. These have the disadvantage that it takes too much time to control red rot bacteria. The disease, called red rot, occurs rapidly when the laver foliage grows and can finally be harvested, spreads to all fishing grounds in a few days, and the foliate dies and flows out, resulting in damage Is big.

[0003] Patents disclosed for controlling red rot fungi include the following. Japanese Patent Publication No. 60-13647
In the publication, citric acid containing 0.3 to 5.0% by weight,
A seaweed cultivation method for controlling and preventing various alga and diseases immersed in a treatment solution having an H of 1.0 to 6.0 is described. In Japanese Patent Publication No. Sho 60-13648, a nori cultivation method is described in which an inorganic acid such as hydrochloric acid, nitric acid, sulfuric acid, and phosphoric acid is added to adjust the pH to 1.0 to 4.0 to control and prevent illness and diseases. ing.

Japanese Patent Publication No. 60-21950 discloses a fertilizer for laver cultivation containing phytic acid or a salt thereof as an active ingredient, a preventive effect against red rot and a diatom control effect. JP-A-57-8722 discloses a nori cultivation method in which a nori net is treated with a treatment solution containing phosphoric acid or a salt thereof to remove and prevent diseases such as diatoms and red rot. .

As described above, seawater solutions of organic acids and / or inorganic acids are effective for controlling red rot fungi, and especially those of so-called "algae" of Aosa, Aonori and other diatoms. It is also important to control the quality of seaweed.
Is required to be 4 or less, and the above-mentioned acid is also used for controlling both of them at the same time. The elimination effect of algae depends on pH, but the elimination effect of red rot bacteria is pH
Does not depend on.

As organic or inorganic acids, those having high solubility such as citric acid, malic acid, phytic acid, acetic acid, gluconic acid, hydrochloric acid, phosphoric acid, nitric acid and sulfuric acid are used. Organic acids such as fumaric acid, adipic acid and itaconic acid have not been used because of their poor solubility.

[0007] Patents using fumaric acid include the following. Japanese Patent Publication No. 3-47810 discloses that in a treatment liquid such as seawater contained in a treatment tank, an amount of fumaric acid exceeding a saturation amount is present in a state covered by a coating means having water permeability. A method for killing green alga, which is a characteristic, is described. JP-A-2-25404 discloses a pesticide containing fumaric acid and / or a fumarate and at least one carbonate selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium carbonate and potassium bicarbonate. An algae and bacterial pesticide characterized by becoming monosodium fumarate and / or monopotassium fumarate when dissolved in water or seawater is described. It kills bacteria with fumarate.

The average number of laver producers is 200 to 1,0
00 seaweed nets are collected. The current processing agent requires a processing time of 5 minutes or more per screen, so that 30 to 40 screens can be operated in one day. A commercially available acid treatment agent is used after diluting it 100-200 times with seawater.
However, since the culture has changed to a large-scale culture of 500 or more, it is necessary to shorten the time for acid treatment, and the ship is buried under a laver net and passed through the treatment solution to process. A moatboat was developed to do. Since the time during which the laver net is immersed in the treatment liquid at this time is as short as 10 seconds to 20 seconds, it has become necessary to use a normal acid treatment agent at a high concentration of 10 to 20 times. Therefore, the amount of the acid treating agent used is increased, which causes a problem of increasing the load on the sea and increasing costs. In addition, since the treatment range is high, the usable range is very narrow.Therefore, when the ship passes quickly, the ship stops halfway, or the immersion time is slightly longer due to the movement of the waves, the effect is ineffective. It has come to be enough or to kill nori. Therefore, development of a treating agent or a treating method which has a high effect of controlling red rot bacteria and has a long use width is strongly desired.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a seaweed cultivation method capable of eliminating red rot bacteria in a short time without harming the seaweed itself.

[0010]

Means for Solving the Problems In order to solve the above-mentioned problems, as a result of diligent research, a solid product obtained by press-molding a mixture of fumaric acid and sodium chloride into a treatment liquid is introduced to form a laver culture net. It has been found that the treatment can eliminate and prevent diseases in a short time without damaging the laver, and completed the present invention.

That is, the present invention is as follows. (1) A seaweed cultivation method comprising adding a solid formed by press-molding a mixture of fumaric acid and sodium chloride to a treatment liquid for seaweed cultivation and immersing the seaweed cultivation net to control and prevent diseases. (2) The nori cultivation method according to (1), wherein the treatment liquid is an acid treatment agent having a pH of 1 to 5. (3) The seaweed cultivation method according to (1) or (2), which is a solid product having a fumaric acid content of 40% or less. (4) The laver cultivation method according to any one of (1) to (3), wherein the treatment is performed using a fishing boat.

[0012] As shown in Test 1, the pressure solidification of fumaric acid or sodium chloride alone was 180
Even a second treatment cannot eliminate red rot bacteria. Those solidified with fumaric acid alone have little effect because they hardly dissolve, and sodium chloride dissolves but does not exert any effect. The present invention in which a mixture of fumaric acid and sodium chloride is pressurized and solidified can eliminate red rot bacteria in 10 to 20 seconds, and nori is not damaged even after being treated for 3 minutes. When passing a boat under the net, the processing time is only 10 to 20 seconds, so when processing the boat, the boat is partially stopped halfway so that the processing time is about 60 seconds. It is reality that we are adjusting. Therefore, a portion where the processing time is short occurs, and a portion where the effect is not obtained occurs. Therefore, in the clearing process using a boat,
Since red rot bacteria can be completely eliminated in 0 seconds, and the ship may stop in operation, it is a necessary condition to extend the usable range as much as possible. When the fumaric acid and sodium chloride obtained by pressurizing and solidifying the fumaric acid of the present invention are used, the solubility of fumaric acid increases and the synergic effect of fumaric acid and sodium chloride eliminates red rot bacteria even in a 10-second treatment. It becomes possible, and it becomes possible to pass through the boat. When an acid treatment agent is used, since seaweed containing seawater enters and is immediately diluted, it is necessary to add the acid treatment agent every time one sheet is processed. However, when the solid of the treating agent of the present invention is used, the active ingredient gradually dissolves, so that there is no need for additional liquid. In other words, the workability for replenishment is not required, and the workability is extremely improved.

Currently, commercially available acid treatment agents for short-time treatment include products such as "Noritaro" and "Kaiho No. 2". Such acid treating agents are all liquid so that they can be immediately diluted and dissolved, and are mainly composed of lactic acid having high sterilizing power. (Disclosed in JP-A-6-298606)

[0014] As can be seen from Test 2, it takes 50 seconds to eliminate red rot bacteria in a 100-fold treatment with a commercially available acid treatment agent "Noritaro", and nori is not damaged until 120 seconds. Therefore, the period between 50 seconds and 120 seconds is the time during which the processing can be performed. When 10% fumaric acid and 90% sodium chloride were solidified under pressure (abbreviated as F10) and added to a 100-fold dilution of Noritaro, the treatment time for red rot bacteria was 5 to 5. In 10 seconds, the time during which the nori is not damaged increases to 180 seconds or more. That is, the processing time is 1
It becomes as wide as 0 to 180 seconds, and the red rot fungus can be completely eliminated without damaging the nori by the boating treatment.

Comparative Examples 8 to 11 are treatment liquids in which the concentration of fumaric acid and the concentration of sodium chloride in the treatment liquid when F10 was added (Examples 1 to 4) were adjusted. The fungicidal effect is not high, and the width of use is reduced. The solid product of fumaric acid and sodium chloride used in the present invention may be used alone, but when used in combination with an acid treating agent, the sterilizing power can be increased and the range of use can be widened. Since it gradually dissolves, it can be used for a long time and workability is good. When fumaric acid and sodium chloride are used in powder, only sodium chloride dissolves immediately, and fumaric acid with low solubility adheres to laver without dissolving and is taken out of the treatment tank or settles at the bottom of the treatment tank. Therefore, the state when only sodium chloride is added is obtained, and the sterilizing power does not increase.

It is preferable that the mixing ratio of fumaric acid and sodium chloride used in the present invention is 40% or less of fumaric acid, and the pressure at the time of molding is 400 tons or more. If fumaric acid exceeds 40%, it hardly dissolves and the workability deteriorates. Further, when molded at a pressure of 400 tons or less, the powder is easily broken and easily turned into powder. The concentration of fumaric acid and salt in the treatment solution was gradually dissolved to make fumaric acid 0.05
It is more preferable to maintain them in the range of 0.5% to 0.5% and 0.5% to 5% of sodium chloride. As the weight of the solid product,
From the viewpoint of work, those having a range of 0.5 kg to 20 kg are easy to use, and the size is adjusted according to the amount of the processing solution.

(Test 1) Fumaric acid 10% in 40 L of sea water
-10 pieces of 0.5 Kg lump (F10) obtained by solidifying a mixture of 90% of sodium chloride at a pressure of 550 tons are added,
The solution was sampled after 1, 2, and 3 hours. To these solutions, add red rot fungus-infected nori and
20, 25, 30, 40, 50, 60, 120, 150
-Dipped for 180 seconds. After the treatment, the test leaves washed with seawater were cultured in a Petri dish containing seawater. Three days later, the microscope was used to examine the effect of controlling red rot bacteria. The treatment water temperature was 20 ° C. As a control, solidified fumaric acid and sodium chloride were used. The results are shown in Table 1.

[0018]

[Table 1]

(Test 2) A mixture of 10% fumaric acid and 90% sodium chloride was solidified at a pressure of 650 tons in 40 L of a 100-fold diluted solution of Noritaro Nori (Daiichi Seiki Co., Ltd.).
A lump of kg (F10) was charged, and the solution was sampled 0.5, 1, 2, and 3 hours later. The concentration of fumaric acid and dissolved sodium chloride in the sampled solution was measured, and fumaric acid or sodium chloride corresponding to this concentration was added to and dissolved in a 100-fold diluted solution of Noritaro Nori. These solutions were tested for red rot fungi. The treatment water temperature is 10 ° C. Table 2 shows the results.

[0020]

[Table 2]

(Test 3) To 40 L of a 100-fold diluted solution of Noritaro Nori (manufactured by Daiichi Seisaku Co., Ltd.), three kinds of mixtures of fumaric acid and sodium chloride (fumaric acid 10%, fumaric acid 20%, fumaric acid 30) were used. %, Fumaric acid 40%) at a pressure of 550 tons and solidified in 5 kg (F10, F20, F30, F40)
, And a red rot fungus control test was performed using the solution after 1 hour. The treatment water temperature is 10 ° C. Table 3 shows the results.

[0022]

[Table 3]

[0023]

According to the present invention, a mixture of fumaric acid and sodium chloride obtained by pressurizing and solidifying the mixture is added to the treatment liquid, and the red rot bacteria can be eliminated in a short time without damaging the laver. As a result, short-time processing by the boat can be performed. In addition, by using it in combination with the acid treatment liquid, it is possible to enhance the sterilizing power and reduce the degree of damage to seaweed.

Claims (4)

[Claims] The present invention is characterized in that a solid product obtained by press-molding a mixture of fumaric acid and sodium chloride is added to a treatment liquid in a laver cultivation process, and the laver cultivation net is immersed to control and prevent diseases. Nori cultivation method. 2. The nori cultivation method according to claim 1, wherein the treatment liquid is an acid treatment liquid having a pH of 1 to 5. 3. The seaweed cultivation method according to claim 1 or 2, wherein the solid product has a fumaric acid content of 40% or less. 4. The seaweed cultivation method according to claim 1, wherein the treatment is carried out using a fishing boat.