Wasabi cultivation method and wasabi cultivation management system

Abstract

To provide a method for cultivating high-quality Japanese horseradish in a short time.SOLUTION: A method for cultivating Japanese horseradish in an indoor facility is provided, including a growing step in which, with the rhizomes of a seedling of Japanese horseradish being immersed in a nutritious liquid, artificial light is applied for circulation of the nutritious liquid, causing the rhizomes to grow. Here, the temperature of the indoor facility is set to 20°C or higher and the temperature of the nutritious liquid is set to 16°C or lower.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a method for cultivating wasabi and a system for managing wasabi cultivation. [Background technology]

[0002] In recent years, the demand for wasabi has been increasing due to the global boom in Japanese food. Wasabi is also attracting attention not only for its food use but also for its pharmaceutical uses.

[0003] One known method for growing wasabi is open-field cultivation. However, open-field cultivation is prone to natural disasters and animal damage, making it difficult to cultivate wasabi stably. Furthermore, open-field cultivation of wasabi typically requires about two years to grow. Therefore, from the perspective of ensuring a stable supply of wasabi, there has been a desire to shorten the growing period.

[0004] One way to solve this problem is to cultivate wasabi in a closed plant factory that is not affected by location or climate. For example, Non-Patent Document 1 discloses a method for cultivating wasabi in a closed plant factory.

[0005] However, although the technique described in Non-Patent Document 1 makes it possible to grow wasabi by methods other than open-field cultivation, there is still room for further improvement in terms of growing wasabi in a short period of time. [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] Itsuo Tanaka, "Environmental Control and Profitability Evaluation of Indoor Hydroponic Cultivation of Wasabi Using Artificial Light," Tokusan Seeds, No. 20, April 2015, pp. 64-67 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, an object of the present invention is to provide a technique relating to a wasabi cultivation method that enables high-quality wasabi to be grown in a short period of time. [Means for solving the problem]

[0008] The present inventors conducted extensive research into methods for cultivating wasabi in indoor facilities to solve the above-mentioned problems, and discovered that when growing wasabi rhizomes by immersing the rhizomes of wasabi seedlings in a nutrient solution, irradiating them with artificial light, and circulating the nutrient solution, the temperature in the indoor facility can be set higher than the low temperature (below 15°C) that has traditionally been considered suitable for growing wasabi, and the temperature of the nutrient solution can be maintained low, thereby significantly increasing the growth rate of wasabi and enabling wasabi of the same quality as conventional wasabi grown outdoors to be grown in about half the time, leading to the completion of the present invention.

[0009] That is, the present invention has an object to advantageously solve the above-mentioned problems, and the wasabi cultivation method of the present invention is a method for cultivating wasabi in an indoor facility, comprising a growing step of growing the wasabi rhizomes by irradiating the rhizomes of wasabi seedlings with artificial light while immersed in a nutrient solution and circulating the nutrient solution, wherein the temperature of the indoor facility is 20°C or higher and the temperature of the nutrient solution is 16°C or lower. Thus, a method for cultivating wasabi in an indoor facility comprising a growing step of growing the wasabi rhizomes by irradiating the rhizomes of wasabi seedlings with artificial light while immersed in a nutrient solution and circulating the nutrient solution, wherein the temperature of the indoor facility is 20°C or higher and the temperature of the nutrient solution is 16°C or lower, enables wasabi to grow in a short period of time. Furthermore, the wasabi cultivation method of the present invention particularly enables wasabi rhizomes to thicken in a short period of time. In the present invention, the term "wasabi seedling" refers to a young plant of wasabi separated from a parent plant of wasabi.

[0010] In the wasabi cultivation method of the present invention, the humidity of the indoor facility is preferably 70% or more and 85% or less. If the humidity of the indoor facility is 70% or more and 85% or less, the rhizomes of wasabi can be enlarged in a shorter period of time.

[0011] In addition, in the wasabi cultivation method of the present invention, the wavelength of the artificial light is preferably 430 nm or more and 490 nm or less. By irradiating the wasabi with artificial light having a wavelength of 430 nm or more and 490 nm or less, the rhizome of the wasabi can be enlarged in an even shorter period of time.

[0012] Furthermore, in the wasabi cultivation method of the present invention, the difference between the temperature of the indoor facility and the temperature of the nutrient solution is preferably 8° C. or more and 15° C. or less. If the difference between the temperature of the indoor facility and the temperature of the nutrient solution is 8° C. or more and 15° C. or less, the growth of wasabi can be further promoted.

[0013] Furthermore, in the wasabi cultivation method of the present invention, the circulation speed of the nutrient solution is preferably 0.1 m / s or more and 0.5 m / s or less. By circulating the nutrient solution at a circulation speed of 0.1 m / s or more and 0.5 m / s or less, a good balance can be achieved between the amount of allyl isocyanate, the pungent component contained in wasabi, and the growth of the wasabi.

[0014] Furthermore, the wasabi cultivation method of the present invention preferably further comprises an adjusting step of taking an image of the wasabi in the growing step and adjusting the cultivation conditions of the wasabi based on the obtained image data. In the adjusting step, the wasabi cultivation conditions are adjusted based on the image data of the wasabi, thereby enabling stable growth of the wasabi.

[0015] The present invention also aims to advantageously solve the above-mentioned problems, and provides a wasabi cultivation management system for use in any of the wasabi cultivation methods described above, comprising at least image data acquisition means for acquiring image data of the wasabi during the growth process, and determination means for comparing the image data with preliminary image data to determine whether or not adjustment of the wasabi cultivation conditions is necessary. With this wasabi cultivation management system, the data acquisition means acquires image data of the wasabi during the growth process, compares the acquired image data with preliminary image data, and adjusts the cultivation conditions when it is determined that adjustment of the cultivation conditions is necessary, thereby enabling the stable growth of high-quality wasabi in a short period of time. [Effects of the Invention]

[0016] According to the wasabi cultivation method of the present invention, high-quality wasabi can be grown in a short period of time. Furthermore, according to the wasabi cultivation management system of the present invention, high-quality wasabi can be grown stably in a short period of time. DETAILED DESCRIPTION OF THE INVENTION

[0017] The method for cultivating wasabi and the system for managing wasabi cultivation of the present invention will be described below in order.

[0018] (How to grow wasabi) The wasabi cultivation method of the present invention (hereinafter also referred to as "this cultivation method") is a method for cultivating wasabi in an indoor facility. This cultivation method includes a growing step in which the rhizomes of wasabi seedlings are immersed in a nutrient solution, and the rhizomes are grown by irradiating them with artificial light and circulating the nutrient solution, and may optionally include other steps such as a pruning step in which wasabi leaves grown in the growing step are pruned.

[0019] <Growing process> This cultivation method includes a growing step in which the rhizomes of wasabi seedlings are immersed in a nutrient solution, and the rhizomes are grown by irradiating them with artificial light and circulating the nutrient solution.

[0020] [Indoor facilities] The growing process is carried out in an indoor facility. Here, "indoor facility" means a closed or semi-closed space in which the wasabi growing environment, including temperature, light, and humidity, is artificially controlled. For example, the indoor facility can be a room, a warehouse, or the like, or a room, warehouse, or the like equipped with a vinyl greenhouse.

[0021] In this cultivation method, the temperature of the indoor facility must be 20°C or higher, and the temperature of the indoor facility is preferably 22°C or higher.

[0022] In conventional outdoor cultivation methods for wasabi, cultivation is often carried out in mountainous regions where the average annual temperature is below 15°C, and so it has been thought that when cultivating wasabi in a plant factory, the temperature should generally be set at a similar level to that for outdoor cultivation. In contrast, in this cultivation method, by deliberately raising the temperature of the indoor facility to 20°C or higher, a synergistic effect with the temperature adjustment of the nutrient solution, which will be described later, can be achieved, significantly shortening the growth period without compromising the quality of the wasabi. Furthermore, from the viewpoint of reducing stress on the wasabi, it is preferable that the temperature of the indoor facility be 25°C or lower. The method for adjusting the temperature of the indoor facility is not particularly limited, and can be carried out using an air conditioning device such as an air conditioner.

[0023] Furthermore, the humidity of the indoor facility is not particularly limited, but is preferably 70% or higher, more preferably 75% or higher, and preferably 90% or lower, and more preferably 85% or lower. If the humidity of the indoor facility is within the above range, hyperrespiration of the wasabi seedlings can be suppressed, and the thickening of the rhizomes of the wasabi seedlings can be further promoted. The humidity in the indoor facility can be adjusted using, for example, a humidifier or a dehumidifier.

[0024] Furthermore, the carbon dioxide (CO2) concentration within the indoor facility is not particularly limited, but is preferably 500 ppm or higher, more preferably 700 ppm or higher, even more preferably 1000 ppm or higher, and preferably 1500 ppm or lower, and more preferably 1200 ppm or lower. If the CO2 concentration within the indoor facility is within the above range, wasabi photosynthesis can be carried out efficiently, thereby promoting the growth of wasabi. The CO2 concentration in the indoor facility can be adjusted, for example, by aerating the indoor facility with CO2 gas.

[0025] [Wasabi seedlings] In the growing step, the rhizomes of the wasabi seedlings are immersed in a nutrient solution, and the rhizomes are irradiated with artificial light and the nutrient solution is circulated, thereby growing the wasabi rhizomes.

[0026] In the present invention, the term "wasabi seedling" refers to a child plant obtained by dividing a parent wasabi plant. The type of parent wasabi is not particularly limited, and examples include the Mazuma and Daruma varieties, with the Mazuma variety being preferred. In addition, in the present invention, the term "rhizome" refers to the parts of the wasabi plant other than the leaves and petioles.

[0027] In this cultivation method, the method for immersing the rhizomes of the wasabi seedlings in the solution is not particularly limited as long as at least a portion of the rhizomes of the wasabi seedlings is immersed in the nutrient solution, but it is preferable to adjust the nutrient solution so that a portion of the rhizomes of the wasabi seedlings protrudes from the nutrient solution.

[0028] [Nutrient solution] In the growing step, the nutrient solution in which the rhizomes of the wasabi seedlings are immersed is not particularly limited as long as it contains fertilizer components necessary for growing wasabi.

[0029] Here, examples of fertilizer components contained in the nutrient solution include nitrogen (N), diphosphorus pentoxide P2O5, magnesium oxide (MgO), manganese oxide (MnO), boron oxide (B2O3), and potassium (K), and among these, it is preferable that the nutrient solution contains potassium.

[0030] The nutrient solution can be prepared by diluting a commercially available fertilizer for hydroponics with a solvent such as water. For example, OAT House Fertilizer (registered trademark) manufactured by OAT Agrio Co., Ltd. can be suitably used as the commercially available fertilizer for hydroponics.

[0031] Furthermore, the concentration of the fertilizer components contained in the nutrient solution, i.e., the fertilizer concentration (EC) of the nutrient solution, is not particularly limited, but is preferably 1.0 dS / m or more, more preferably 1.5 S / m or more, and even more preferably 2.0 dS / m or more. If the fertilizer concentration of the nutrient solution is 1.0 dS / m or more, the growth of wasabi can be further promoted.

[0032] In this cultivation method, the temperature of the nutrient solution must be 16° C. or lower, preferably 14° C. or lower, more preferably 10° C. or higher, and particularly preferably 12° C. or higher. By setting the temperature of the indoor facility described above to 20° C. or higher and the temperature of the nutrient solution to 16° C. or lower, the synergistic effect of these two factors can promote the growth of wasabi in the growing process, and in particular, can promote the thickening of the rhizomes of wasabi. In the present invention, the "temperature of the nutrient solution" refers to the temperature of the nutrient solution around the rhizome of the wasabi plant immersed in the nutrient solution. The method for adjusting the temperature of the nutrient solution is not particularly limited, and the temperature can be adjusted by known techniques, for example, by providing a temperature control device such as a water temperature regulator.

[0033] Furthermore, in this cultivation method, the difference between the temperature of the nutrient solution and the temperature of the indoor facility and the temperature of the nutrient solution is preferably 8° C. or more, more preferably 9° C. or more, and preferably 15° C. or less, and more preferably 13° C. or less. If the difference between the temperature of the indoor facility and the temperature of the nutrient solution is within the above range, the growth of wasabi can be further promoted and the wasabi can be grown stably.

[0034] Furthermore, the pH of the nutrient solution is not particularly limited, but is preferably not less than 5.5 and not more than 6.5. If the pH of the nutrient solution is within the above range, the environmental stress experienced by wasabi can be reduced, allowing wasabi to grow more stably.

[0035] Furthermore, the dissolved oxygen concentration in the nutrient solution is not particularly limited, but is preferably 10.0 mg / L or more, and more preferably 10.5 mg / L or more. If the dissolved oxygen concentration in the nutrient solution is 10.0 mg / L or more, a sufficient amount of oxygen necessary for the thickening of the rhizomes of wasabi can be ensured.

[0036] Furthermore, in the growing step, it is more preferable to adjust the fertilizer concentration of the nutrient solution so that it is different in the initial stage of the growing step and in the subsequent stages. Specifically, in the growing step, after immersing the rhizomes of wasabi seedlings in the nutrient solution, the fertilizer concentration of the nutrient solution may be adjusted to, for example, 3.0 dS / m for about two months (initial stage), and then adjusted to 2.0 dS / m after about two months (initial stage and subsequent stages). In this way, the thickening of the rhizomes of wasabi can be further promoted.

[0037] Furthermore, the method for circulating the nutrient solution is not particularly limited as long as it prevents stagnation of the nutrient solution during the growth process. In this case, the circulation speed of the nutrient solution is preferably 0.1 m / s or more and 0.5 m / s or less. If the circulation speed of the nutrient solution is within the above range, a good balance can be achieved between the amount of allyl isocyanate, the pungent component contained in wasabi, and the growth of wasabi. The nutrient solution can be circulated using, for example, a circulation pump.

[0038] [Artificial light] In the growing step, the rhizomes of the wasabi seedlings are immersed in a nutrient solution and irradiated with artificial light. Here, the artificial light to be irradiated is not particularly limited, but it is preferable to use an LED as the light source.

[0039] The wavelength of the artificial light is not particularly limited, but from the viewpoint of further promoting the thickening of the rhizome of wasabi, it is preferably 430 nm or more and 490 nm or less, and more preferably 450 nm or more and 490 nm or less. When the wavelength of the artificial light is 450 nm or more, the wasabi is not damaged, and when it is 490 nm or less, the wasabi rhizome can be thickened more reliably. In other words, the light source of the artificial light is preferably a blue monochromatic light source that emits light with a wavelength of 430 nm or more and 490 nm or less.

[0040] The light intensity of the artificial light is not particularly limited, but the photosynthetic photon flux density (PPDF) of the artificial light is 10 μmol / l or less. -2 s -1 It is preferable that it is 60 μmol / L or more. -2 s -1 It is preferable that it is 110 μmol / L or more. -2 s -1 More preferably, it is 230 μmol / L or more. -2 s -1 If the photosynthetic photon flux density of the artificial light is within the above range, the occurrence of tip burn and the like can be avoided, and wasabi can be grown more stably.

[0041] The irradiation time of the artificial light is not particularly limited, but from the viewpoint of more stable growth of wasabi, it is preferable to adjust the irradiation time so that a period during which artificial light is irradiated (hereinafter, this period will be referred to as the "light period") and a period during which artificial light is not irradiated (hereinafter, this period will be referred to as the "dark period") are alternately repeated.

[0042] The duration of the light period is not particularly limited and can be, for example, 10 to 20 hours. From the viewpoint of further promoting the thickening of the rhizome of wasabi, the light period is preferably 12 hours or more and 16 hours or less. The duration of the dark period is not particularly limited and can be, for example, 4 to 20 hours.

[0043] From the viewpoint of sufficient thickening of the rhizome of wasabi, it is preferable to repeat the cycle of the above-mentioned light and dark periods for 180 cycles or more, more preferably for 240 cycles or more, and even more preferably for 300 cycles or more, where one cycle is the light and dark period.

[0044] Furthermore, from the viewpoint of growing the wasabi seedlings more stably, it is preferable to vary the temperature and humidity of the indoor facility and the temperature of the nutrient solution between the light period and the dark period.

[0045] Specifically, it is preferable that the temperature of the indoor facility during the light period be 22°C or higher, the humidity be 70% or higher, and the temperature of the nutrient solution be 14°C or higher. It is also preferable that the temperature of the indoor facility during the dark period be 20°C or higher, the humidity be 80% or higher, and the temperature of the nutrient solution be 12°C or higher.

[0046] The method of applying artificial light is not particularly limited, but from the viewpoint of sufficiently thickening the rhizomes of wasabi seedlings, it is preferable to apply artificial light from the top side of the wasabi.

[0047] <Pruning process> This cultivation method can further include, as an optional step, a pruning step of pruning the leaves of the wasabi growing in the growing step. This step inhibits the growth of wasabi leaves and further promotes the growth of the wasabi rhizome. Although there are no particular limitations on pruning conditions, from the perspective of further promoting the thickening of the rhizome of wasabi, it is preferable to leave about five leaves on the top side of the wasabi when the wasabi leaves have grown to a width of about 10 cm, and prune the remaining leaves together with their petioles.

[0048] This cultivation method allows high-quality wasabi to be grown in a short period of time. Specifically, for example, when the Mazuma variety is used as the parent plant for wasabi seedlings, it usually takes about two years for the rhizomes of wasabi to grow to a harvestable size in outdoor cultivation, but this cultivation method can shorten this period to about one year or less. Furthermore, according to the present cultivation method, cultivation can be carried out in an indoor facility, which allows for more stable cultivation than open-field cultivation.

[0049] The present cultivation method described above may be carried out by modifying the above-described embodiment according to the following modified examples.

[0050] (Variations in cultivation methods) A modification of the above-described embodiment may further include an adjusting step of taking an image of the wasabi during the growing step and adjusting the cultivation conditions of the wasabi based on the obtained image data.

[0051] Here, examples of wasabi cultivation conditions include the temperature of the indoor facility, the carbon dioxide concentration in the indoor facility, the humidity of the indoor facility, the temperature of the nutrient solution, the concentration of the nutrient solution, the pH of the nutrient solution, the dissolved oxygen concentration in the nutrient solution, the wavelength of the artificial light, the light intensity of the artificial light, the irradiation time of the artificial light, and the circulation rate of the nutrient solution.

[0052] By adjusting the wasabi cultivation conditions based on the wasabi image data in the adjustment process, it is possible to grasp minor changes in the wasabi's growth that cannot be detected visually, allowing the wasabi to be grown more stably.

[0053] (Wasabi cultivation management system) The wasabi cultivation management system of the present invention (hereinafter also referred to as "this cultivation management system") is a wasabi cultivation management system used in the wasabi cultivation method described above, and is characterized by comprising at least image data acquisition means for acquiring image data of the wasabi during the growth process, and determination means for comparing the image data with preliminary image data to determine whether or not adjustment of the wasabi cultivation conditions is necessary.

[0054] By providing the image data acquisition means and the determination means, the wasabi growing process can be managed quantitatively and efficiently, and as a result, high-quality wasabi can be grown stably in a short period of time.

[0055] Here, the image data acquisition means is a means for acquiring image data of the wasabi during the growing process. By acquiring the image data of the wasabi continuously or intermittently at regular intervals, the image data can be used as material for judgment by the judgment means described below.

[0056] Examples of methods for obtaining the image data of wasabi include a method of taking images intermittently at regular intervals using a camera, and a method of taking a video to obtain continuous image data.

[0057] The determination means is a means for comparing the acquired image data with preliminary image data to determine whether or not adjustment of the cultivation conditions of the wasabi is necessary. Note that the preliminary image data is image data acquired for wasabi that has been determined to be properly grown based on, for example, past experiments.

[0058] The judgment by the judgment means can be made, for example, by comparing the image data acquired by the image data acquisition means with the preliminary image data, and if there is little difference between the image data and the preliminary image data, the wasabi cultivation process can be continued as is, but if there is a large difference between the acquired image data and the preliminary image data, the conditions for the wasabi cultivation process can be changed.

[0059] Furthermore, the image data acquired by the image data acquisition means can be digitized and compared with previously digitized image data to determine whether it is within a threshold value or not.

[0060] When it is determined that adjustment of the cultivation conditions is necessary, the wasabi growth conditions (temperature, artificial light, and nutrient solution conditions in the indoor facility) can be adjusted to cultivate the wasabi under more suitable conditions.

[0061] It is preferable that the present cultivation management system further comprises a control means for adjusting the cultivation conditions when it is determined that the cultivation conditions need to be adjusted. The control means can use, for example, a computer to automatically adjust the wasabi growth conditions (temperature, artificial light, and nutrient solution conditions in the indoor facility) based on the results of the judgment by the judgment means, or can display something like an alarm to prompt manual adjustment.

[0062] Moreover, it is preferable that the present cultivation management system further comprises a storage means for storing cultivation condition data relating to the cultivation conditions of wasabi. By storing a plurality of pieces of cultivation condition data in the storage means, it is possible to easily compare the acquired image data with the cultivation conditions. Note that the storage means is preferably implemented by a computer. [Example]

[0063] The present invention will now be described in more detail with reference to the following examples, but the present invention is not limited to these examples in any way.

[0064] <Indoor facilities> The indoor facility used was a container room shielded from sunlight. A cooler, humidity regulator, and hydroponic cultivation equipment ("Lino Farm STANDARD" manufactured by Taiyo Chemical Co., Ltd.) were installed in this container room. The hydroponic cultivation equipment was configured as follows: Number of shelves: 3 Height of each shelf: approx. 40cm Each shelf is equipped with a nutrient solution tray (length: approx. 54 cm, width: approx. 139 cm, depth: approx. 10 cm). Above each shelf, three LED light sources (length: approximately 124 cm) are installed at equal intervals along the shelf depth. Equipped with a circulation pump that can circulate the nutrient solution filled in the nutrient solution tray Equipped with a nutrient solution tank that can replenish the nutrient solution in the nutrient solution tray as needed

[0065] <Wasabi seedlings> 72 wasabi seedlings were used. Each wasabi seedling was washed with water to remove any soil attached. Details of the wasabi seedlings are shown below. Variety: Mazuma (Miyoshi Agritech Co., Ltd. "Mazuma No. 1") Average mass of wasabi seedlings: 7.5g Average height of wasabi seedlings: 10-15cm

[0066] <Nutrient solution> Liquid fertilizer (OAT Agrio Co., Ltd., "OAT House No. 1") was diluted with water to prepare a nutrient solution with a fertilizer concentration (EC) of 3.0 dS / m. The pH of the resulting nutrient solution was 6.0.

[0067] Example 1 <Planting wasabi seedlings> In the container chamber, the nutrient solution tray mounted on the hydroponic cultivation device was filled with nutrient solution. Next, a planting panel with multiple planting holes was placed on the nutrient solution tray. The wasabi seedlings were then inserted into the planting holes of the planting panel. At this time, the wasabi seedlings were adjusted so that about 5 cm of their rhizomes were positioned above the surface of the nutrient solution.

[0068] <Growing process> The rhizomes of wasabi seedlings were immersed in the nutrient solution, and while the nutrient solution was circulated (circulation speed: 0.3 m / s) using the circulation pump installed in the hydroponic cultivation device, the wasabi was irradiated with artificial light using an LED light source installed in the hydroponic cultivation device for 16 hours (light period). The LED light source was then turned off, and the nutrient solution continued to circulate for another 8 hours (dark period). This cycle including light and dark periods was repeated for more than 180 cycles to grow the wasabi. During the growth process, the nutrient solution decreased due to absorption by the wasabi or evaporation, so the nutrient solution was replenished from the nutrient solution tank to the nutrient solution tray once every 7 cycles (1 week). The various conditions used in the growth process are as follows: Indoor facility temperature: 22℃ LED wavelength: 460nm Photosynthetic photon density (PPFD) of LED: 100 μmol m -2 ·s -1 Nutrient solution temperature: 13℃ (The temperature of the nutrient solution was controlled using a chiller "ZR-75E" manufactured by Zensui Co., Ltd.) Dissolved oxygen concentration in the nutrient solution: 10 mg / L

[0069] After planting the wasabi seedlings, the wasabi leaves were allowed to grow profusely until 30 cycles (1 month) had passed.

[0070] <Pruning process> After planting the wasabi seedlings, 30 cycles (1 month) had passed, and then the wasabi leaves were pruned once every 14 cycles (2 weeks). Specifically, when viewed from the top of the wasabi plant, about 5 leaves were left, counting from the top, and the remaining leaves were removed along with their petioles. In addition, when flower buds appeared on the wasabi seedlings, they were removed.

[0071] <Harvest> After 240 cycles (approximately 8 months), the wasabi rhizomes had grown sufficiently and were harvested. The average weight of each wasabi plant was 30g.

[0072] (Comparative Example 1) The same procedures as in Example 1 were carried out during the growth process, except that the temperature of the nutrient solution was set to 20°C. After 300 cycles (approximately 10 months), the wasabi rhizomes had grown large enough to be harvested, so the wasabi was harvested. The average weight of each wasabi plant was 30g.

[0073] Comparing the results of Example 1 and Comparative Example 1 above, it can be seen that in the growing process in which the rhizomes of wasabi seedlings are immersed in a nutrient solution, irradiated with LED (artificial light), and the nutrient solution is circulated to grow the rhizomes of wasabi seedlings, wasabi can be grown in a short period of time as long as the temperature of the indoor facility is 20°C or higher and the temperature of the nutrient solution is 16°C or lower. [Industrial Applicability]

[0074] According to the present invention, high-quality wasabi can be grown in a short period of time even in environments where cultivation was previously impossible. Therefore, the present invention can be used extremely advantageously as a cultivation method that ensures a stable supply of wasabi.

Claims

1. A method for cultivating wasabi in an indoor facility, comprising: The method includes a growing step of immersing the rhizomes of wasabi seedlings in a nutrient solution, irradiating the rhizomes with artificial light, and circulating the nutrient solution to grow the rhizomes of the wasabi seedlings. The temperature of the indoor facility is 20°C or higher, The temperature of the nutrient solution is 16°C or less, The method further includes an adjusting step of taking an image of the wasabi during the growing step and adjusting the cultivation conditions of the wasabi based on the obtained image data, The wasabi cultivation method is characterized in that the wasabi cultivation conditions are at least one selected from the group consisting of the temperature of the indoor facility, the carbon dioxide concentration in the indoor facility, the humidity of the indoor facility, the temperature of the nutrient solution, the concentration of the nutrient solution, the pH of the nutrient solution, the dissolved oxygen concentration in the nutrient solution, the wavelength of the artificial light, the light intensity of the artificial light, the irradiation time of the artificial light, and the circulation rate of the nutrient solution.

2. 2. The method for cultivating wasabi according to claim 1, wherein the humidity of the indoor facility is 70% or more and 85% or less.

3. 3. The wasabi cultivation method according to claim 1, wherein the difference between the temperature of the indoor facility and the temperature of the nutrient solution is 8°C or more and 15°C or less.

4. The wasabi cultivation method according to any one of claims 1 to 3, wherein the circulation speed of the nutrient solution is 0.1 m / s or more and 0.5 m / s or less.

5. A method for cultivating wasabi according to any one of claims 1 to 4, further comprising a pruning step of pruning the wasabi leaves when the wasabi leaves have grown to a width of about 10 cm during the growing step.

6. A wasabi cultivation management system used in the wasabi cultivation method according to any one of claims 1 to 5, image data acquisition means for acquiring image data of the wasabi during the growing process; a determination means for comparing the image data with preliminary image data to determine whether or not adjustment of the cultivation conditions of the wasabi is necessary; A wasabi cultivation management system that adjusts at least one cultivation condition selected from the group consisting of the temperature of the indoor facility, the carbon dioxide concentration in the indoor facility, the humidity of the indoor facility, the temperature of the nutrient solution, the concentration of the nutrient solution, the pH of the nutrient solution, the dissolved oxygen concentration in the nutrient solution, the wavelength of the artificial light, the light intensity of the artificial light, the irradiation time of the artificial light, and the circulation rate of the nutrient solution, based on the result of the determination means.