Strawberry seedling production method and strawberry seedling growing device

Abstract

To provide a strawberry seedling production method and a strawberry seedling growing device that can supply a sufficient amount of strawberry seedlings within a specified shipping period.SOLUTION: A production method for strawberry seedlings S, which allows the strawberry seedlings S to be shipped within a specified shipping period SP in one year, includes: growing steps S1 to S4 for the strawberry seedlings S of growing the strawberry seedlings S sequentially over multiple times between the start of the specified shipping period SP and the start of the specified shipping period SP of the following year; and a frozen storage step S5 of freezing the strawberry seedlings S that have finished growing at least before the specified shipping period SP among the multiple batches of the strawberry seedlings S in order to ship the multiple batches of the strawberry seedlings S grown sequentially over multiple times, within the specified shipping period SP.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for producing strawberry seedlings and an apparatus for growing strawberry seedlings. [Background technology]

[0002] Traditionally, strawberries grown outdoors follow the main cultivation schedule below. First, farmers who grow strawberry seedlings purchase parent plants of a specific variety, grow the parent plants from around November, and plant them around March. From around May, the runners that will become the seedlings are inserted into seedling pots and allowed to root. The seedlings are then transplanted into temporary planting beds and grown for 40 to 60 days, with the strawberry seedlings being harvested between August and September. Farmers who grow strawberries in addition to growing them plant the harvested seedlings in a field and harvest the strawberries between December and May. After harvest, the plants are removed between June and August.

[0003] Meanwhile, farmers who grow only strawberry seedlings harvest them in August and September and ship them to farmers who grow strawberry fruit. Farmers who grow only strawberry fruit plant the strawberry seedlings they obtain in fields and harvest the fruit from December to May. After harvesting, the seedlings are removed from the fields from June to August. A method for growing strawberry seedlings is known, for example, as described in Patent Document 1. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-24416 Summary of the Invention [Problem to be solved by the invention]

[0005] Recently, due to global warming, strawberry seedlings grown outdoors are increasingly susceptible to damage from infectious diseases and pests, making it difficult to provide a sufficient supply of strawberry seedlings using conventional outdoor cultivation methods.

[0006] As mentioned above, the work of growing strawberry seedlings and the work of harvesting strawberries overlap from March to May. Furthermore, the work of harvesting strawberry seedlings and the work of removing the harvested strawberries overlap from August to September. This places a considerable burden on farmers to both grow strawberry seedlings and cultivate strawberries. As a result, the number of farmers who grow strawberry seedlings and cultivate strawberries is decreasing, making it even more difficult to supply strawberry seedlings.

[0007] Furthermore, as mentioned above, strawberry seedlings are shipped once a year, in the above example, from August to September, which creates the problem that it is difficult to grow strawberry seedlings in a manner that allows for a supply of sufficient quantities at the specified supply time.

[0008] The present invention has been made in view of the above background, and aims to provide a method for producing strawberry seedlings and a strawberry seedling growing device that can supply a sufficient amount of strawberry seedlings within a specified shipping period. [Means for solving the problem]

[0009] One aspect of the present invention is A method for producing strawberry seedlings so that they can be shipped within a specified shipping period of one year, A strawberry seedling growing process in which the strawberry seedlings are grown multiple times in succession within the period between the start of the predetermined shipping period and the start of the next year's predetermined shipping period; The method for producing strawberry seedlings includes a freezing and preserving step of freezing at least the strawberry seedlings among the plurality of batches that have finished growing before the predetermined shipping period, in order to ship the plurality of batches of strawberry seedlings that have been grown sequentially over a plurality of times within the predetermined shipping period.

[0010] Another aspect of the present invention is a parent plant raising tool having at least one parent plant raising area in which the parent plants are accommodated; a seedling raising tool having at least one seedling raising area in which seedlings are accommodated; The parent plant seedling raising area and the offspring plant seedling raising area are in a strawberry seedling growing apparatus in which water is not shared. [Effects of the Invention]

[0011] According to one aspect of the present invention, a sufficient amount of strawberry seedlings that have been grown sequentially over multiple batches can be supplied within a specified shipping period.

[0012] According to another aspect of the present invention, the parent plant nursery area and the offspring nursery area do not share water, which prevents the spread of infectious diseases from parent plants to offspring or vice versa. This allows for a sufficient supply of strawberry seedlings that have been grown sequentially multiple times within a specified shipping period. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a block diagram showing a strawberry seedling production system according to a first embodiment. [Figure 2] 1 is a plan view showing a strawberry seedling growing device according to a first embodiment. [Figure 3] Cross-sectional view of line III-III in Figure 2. [Figure 4] 1 is a cross-sectional view showing a strawberry seedling according to a first embodiment. [Figure 5] 1 is a cross-sectional view showing a state in which strawberry seedlings according to the first embodiment are housed in a tray. [Figure 6] FIG. 2 is a diagram showing a growth schedule of strawberry seedlings in the strawberry seedling production system according to the first embodiment. [Figure 7] 3 is a flowchart showing the operation of the strawberry seedling production system according to the first embodiment. [Figure 8] FIG. 10 is a plan view showing a strawberry seedling growing device according to a second embodiment. [Figure 9] FIG. 10 is a plan view showing a strawberry seedling growing device according to a third embodiment. [Figure 10] FIG. 10 is a plan view showing a strawberry seedling growing device according to a fourth embodiment. [Figure 11] FIG. 10 is a diagram showing a growth schedule of strawberry seedlings in a strawberry seedling production system according to a fifth embodiment. [Figure 12] 10 is a flowchart showing the operation of a strawberry seedling production system according to a fifth embodiment. [Figure 13] FIG. 13 is a diagram showing a growth schedule of strawberry seedlings in a strawberry seedling production system according to a sixth embodiment. [Figure 14] FIG. 11 is a plan view showing a strawberry seedling growing device according to a seventh embodiment. [Figure 15] 15 is a cross-sectional view taken along line XV-XV in FIG. 14. DETAILED DESCRIPTION OF THE INVENTION

[0014] (Embodiment 1) 1. Overview of Strawberry Seedling S Production System 1 1 and 2, a first embodiment in which the present invention is applied to a production system 1 for strawberry seedlings S will be described. The production system 1 for strawberry seedlings S according to this embodiment includes a growing device 3 for strawberry seedlings S and a freezing and preserving device 4 for strawberry seedlings S, which are arranged inside the building of a plant factory 2. However, the freezing and preserving device 4 for strawberry seedlings S may also be arranged outside the building of the plant factory 2.

[0015] In the production system 1 for strawberry seedlings S according to this embodiment, the strawberry seedlings S are shipped during a specified shipping period SP in one year. The strawberry seedlings S are grown sequentially multiple times by the growing device 3 for the strawberry seedlings S during the period between the start of the specified shipping period SP and the start of the specified shipping period SP of the following year. In this embodiment, multiple baby plants C are grown that arise from a first runner R1 extending from a parent plant P (see FIG. 2). In this way, the parent plant P is used to grow the baby plants C, and it is the baby plants C that are grown by the production system 1 according to this embodiment. In other words, the strawberry seedlings S grown in the production system 1 according to this embodiment include baby plants C but not the parent plant P.

[0016] As shown in Figure 1, in order to ship strawberry seedlings S that have been grown sequentially over multiple batches within a specified shipping period SP, at least those strawberry seedlings S among the multiple batches that have finished growing before the specified shipping period SP are frozen in a strawberry seedling S freezing and preservation device 4 and preserved in a frozen state. The frozen and preserved strawberry seedlings S are thawed by a known method and then shipped within the specified shipping period SP. However, strawberry seedlings S that have finished growing within the specified shipping period SP may be shipped without being frozen and preserved, or may be shipped after being frozen and preserved in order to adjust the shipping time within the specified shipping period SP.

[0017] The specified shipping period SP is shorter than one year. The specified shipping period SP refers to the period appropriate for farmers who cultivate strawberries for one season to purchase strawberry seedlings S. In Japan, July to October is preferred. Any two months between July and October are preferred because they allow high-quality strawberries to be cultivated. For example, July to August is preferred in relatively cold regions, August to September is preferred in regions with average temperatures, and September to October is preferred in relatively warm regions. However, the specified shipping period SP may be any one month between July and October, or any three months. The any period may be based on the calendar, or may be one, two, or three months that are not based on the calendar. However, in countries other than Japan, the period is not limited to July to October. Furthermore, even if the strawberry seedlings S are provided to farmers who intend to ship strawberries at a different time from outdoor cultivation due to cultivation in an enclosed space, etc., it is not limited to July to October.

[0018] 2. Strawberry seedling S growth device 3 2 to 4, a growing device 3 for strawberry seedlings S will be described. As shown in FIG. 2, the growing device 3 for strawberry seedlings S includes at least one planter 10 for parent plants (an example of a parent plant raising tool) and a plurality (five in this embodiment) of planters 20 for seedlings (an example of a seedling raising tool). However, the number of planters 20 for seedlings is not particularly limited and may be one to four, or six or more. There may also be two or more parent planter 10 planters. The parent plant raising tool or the seedling raising tool is not particularly limited and may have any configuration. The parent plant raising tool or the seedling raising tool may be, for example, a container-like pot provided with a recess (an example of a parent plant raising area or an example of a seedling raising area) in which strawberry seedlings S can be grown, or may be a seedling raising plate in which a plurality of pots are integrally formed.

[0019] (1) Planter 10 for parent plants As shown in Figure 2, the parent plant planter 10 is formed long in the longitudinal direction. As shown in Figure 3, the parent plant planter 10 is formed in a box shape that opens upward. The space inside the parent plant planter 10 is used as a parent plant seedling raising area 15. A culture medium 11 is accommodated inside the parent plant planter 10 (parent plant seedling raising area 15). The culture medium 11 is not particularly limited, and a known culture medium 11 can be used.

[0020] As shown in FIG. 2, a plurality of parent plants P (five in this embodiment) of strawberry seedlings S are arranged in the culture medium 11 at intervals in the longitudinal direction of the parent planter 10. The parent plants P may be arranged at equal intervals or at different intervals. In this embodiment, the parent plants P are arranged at equal intervals. The parent plants P share water in the parent plant raising area 15.

[0021] As shown in FIG. 2, a nutrient solution supplying unit 12 extending longitudinally is disposed above the culture medium 11 of the parent planter 10. As shown in FIG. 3, the nutrient solution supplying unit 12 is formed in a hollow cylindrical shape. Nutrient solution 12a containing nutrients flows through the nutrient solution supplying unit 12. The nutrient solution 12a is supplied from the nutrient solution supplying unit 12 to the culture medium 11 of the parent planter 10 (see arrow L). The material constituting the nutrient solution supplying unit 12 is not particularly limited, and any material such as metal or resin can be appropriately selected. The cross-sectional shape of the nutrient solution supplying unit 12 is not particularly limited, and any shape such as a circle or a square can be appropriately selected. The cross-sectional shape of the nutrient solution supplying unit 12 in this embodiment is formed in a circular shape. However, instead of the nutrient solution supplying unit 12, a water supplying unit that supplies water not containing nutrients may be provided.

[0022] As shown in Figure 3, the nutrient solution supply unit 12 has supply ports 12b formed through the side wall of the nutrient solution supply unit 12 at positions corresponding to each parent plant P. The nutrient solution 12a flowing through the nutrient solution supply unit 12 flows out from the supply ports 12b and is supplied to each parent plant P. The supply amount of the nutrient solution 12a is adjusted by opening and closing a valve (not shown) provided in the nutrient solution supply unit 12. The nutrient solution 12a supplied from the supply ports 12b of the nutrient solution supply unit 12 flows down into the culture medium 11 and is absorbed from the culture medium 11 by the parent plants P.

[0023] As shown in Figure 3, outlets 10a for discharging the nutrient solution 12a are formed through the bottom wall of the parent plant planter 10 at positions corresponding to each parent plant P. The nutrient solution 12a that is not absorbed by the parent plants P flows down through the culture medium 11 and is discharged from the parent plant planter 10 through the outlets 10a.

[0024] As shown in Figure 3, the outlet 10a is connected to a nutrient solution recovery unit 13 via a relay pipe 10b. As shown in Figure 2, the nutrient solution recovery unit 13 is formed in a cylindrical shape that is long in the longitudinal direction. The nutrient solution recovery unit 13 can recover the nutrient solution 12a supplied to each parent plant P.

[0025] As shown in FIG. 2, the nutrient solution recovery unit 13 is connected to the sterilization device 14 via piping 13a. The nutrient solution 12a recovered from the parent plant planter 10 by the nutrient solution recovery unit 13 is sent to the sterilization device 14 (see arrow M). The sterilization device 14 sterilizes the nutrient solution 12a recovered by the nutrient solution recovery unit 13 using a known method. The sterilization device 14 sends the sterilized nutrient solution 12a to the nutrient solution supply unit 12 via piping 13a (see arrow N). This allows the nutrient solution 12a to be recycled and reused. However, the sterilization device 14 may be omitted.

[0026] (2) Planter for seedlings 20 As shown in FIG. 2, the multiple planters for seedlings 20 are each arranged in a position corresponding to the position of the parent plant P in the parent plant planter 10. In this embodiment, the planters for seedlings 20 are arranged either to the left or right of the parent plant P arranged in the parent plant planter 10 in FIG. 2. The planters for seedlings 20 are formed long in a cross direction that intersects with the longitudinal direction. The multiple planters for seedlings 20 are arranged side by side with gaps in the longitudinal direction. In this embodiment, the multiple planters for seedlings 20 are arranged in a staggered (zigzag) pattern on both sides of the parent plant planter 10 in the cross direction.

[0027] The internal space of the seedling planter 20 is used as a seedling raising area 24. One seedling planter 20 is arranged for one parent plant P. In one seedling planter 20, multiple seedlings C that have developed on a first runner R1 (an example of a runner) extending from the parent plant P are cultivated. Inside the seedling raising area 24, water is shared among the multiple seedlings C. However, water is not shared between the parent plant seedling raising area 15 and the seedling raising area 24.

[0028] As shown in FIG. 3, the planter for seedlings 20 is formed in a box shape that opens upward. Nutrient-free water 21 is supplied into the planter for seedlings 20. The water supply path to the planter for seedlings 20 is different from the water supply path to the planter for parent plants 10. A water supply device 22 that supplies water 21 is arranged at one end of the planter for seedlings 20 (in this embodiment, the end of the planter for seedlings 20 opposite the parent planter 10). The end of the water supply device 22 is a water supply port 22a that opens above one end of the planter for seedlings 20. A drain port 20a that discharges the water 21 is arranged in the bottom wall of the planter for seedlings 20 at the other end of the planter for seedlings 20 (in this embodiment, the end of the planter for seedlings 20 facing the parent planter 10). Inside the planter for seedlings 20, water 21 supplied to the planter for seedlings 20 from the water supply port 22a flows along the bottom surface 20b of the planter for seedlings 20 from one end to the other end, and is drained out of the planter for seedlings 20 from the drain port 20a. However, the planter for seedlings 20 may also be configured so that the water supply port 22a is located on the side of the planter for parent plants 10, and the drain port 20a is located on the side opposite the parent planter 10. Alternatively, a water supply pipe may be located above the planter for seedlings 20, and water may be supplied to the planter for seedlings 20 from holes formed in the pipe.

[0029] However, the water supply device 22 may be configured to supply a nutrient solution containing nutrients. The water supply device 22 may be configured to supply the same nutrient solution as the nutrient solution supplied to the parent plant P, or may be configured to supply a nutrient solution having different components, concentrations, etc. from the nutrient solution supplied to the parent plant P.

[0030] A cylindrical water volume adjusting member 20c having a predetermined length is attached to the open end of the drain outlet 20a. By attaching the water volume adjusting member 20c to the open end of the drain outlet 20a, the depth of the water 21 stored inside the planter for seedlings 20 can be adjusted. This allows the amount of water in the planter for seedlings 20 to be adjusted.

[0031] On the bottom wall of the planter for seedlings 20, seedlings C planted in culture medium 32 wrapped in bags 31 are arranged at intervals in the cross direction. In this embodiment, three seedlings C are arranged in one planter for seedlings 20. However, one planter for seedlings 20 may be configured to arrange one, two, or four or more seedlings C. The culture medium 32 wrapped in the bags 31 may be the same as or different from the culture medium 11 arranged inside the planter for parent plants 10. However, the bags 31 may be omitted.

[0032] The first runner R1 growing from the parent plant P produces the first offspring C1 (known as the Taro plant). The second runner R2 grows from the first offspring C1, and the second runner R2 produces the second offspring C2 (known as the Jiro plant). The third runner R3 grows from the second offspring C2, and the third runner R3 produces the third offspring C3 (known as the Saburo plant). In the following explanation, when the first to third offspring C1 to C3 are not to be distinguished, they may be referred to as offspring C.

[0033] As described above, nutrient-free water 21 is supplied to the seedling planter 20. The nutrients contained in the nutrient solution 12a supplied to the parent plant P are supplied to the first seedling C1, second seedling C2, and third seedling C3 via the first runner R1, second runner R2, and third runner R3.

[0034] As shown in Fig. 3, an illumination device 23 is disposed above the parent plant P and the offspring C to illuminate both the parent plant P and the offspring C. The illumination device 23 is formed long in the cross direction. As shown in Fig. 2, the illumination device 23 is disposed along the planter 20 for offspring.

[0035] As shown in FIG. 4, seedlings C are grown in a known culture medium 32 wrapped in a bag 31. An opening 31a that opens upward is formed on the top surface of the bag 31. The seedlings C are placed in the culture medium 32 exposed from the opening 31a of the bag 31. The bag 31 is formed into a bag shape using nonwoven fabric. The resin that makes up the nonwoven fabric is not particularly limited, and it is made of, for example, a hydrophilic resin. By making the nonwoven fabric using a hydrophilic resin, the water retention of the culture medium 32 can be improved. The strawberry seedlings S are planted in the culture medium 32 filled in the bag 31 and grow to a predetermined size.

[0036] For example, Jiffy Seven (manufactured by Sakata Seed Corporation) can be suitably used as the bag 31 and the culture medium 32 filled in the bag 31. However, the bag 31 and the culture medium 32 filled in the bag 31 are not limited to Jiffy Seven. The seedling C may also be grown in the culture medium 32 filled in a resin pot.

[0037] Generally, the first offspring plant C1 grows the largest, and the second offspring plant C2 and the third offspring plant C3 are smaller than the first offspring plant C1. Therefore, to determine whether the strawberry seedlings S have grown to a stage suitable for shipping, a common growth indicator may be used to make the sizes of the first offspring plant C1, the second offspring plant C2, and the third offspring plant C3 uniform at the time of shipping the strawberry seedlings S, or a corresponding growth indicator may be used for the first offspring plant C1, the second offspring plant C2, and the third offspring plant C3, which are different in size to begin with.

[0038] In another embodiment of the present invention, the first runner R1, the second runner R2, and the third runner R3 may be cut when roots have developed from the third offspring C3, enabling the third offspring C3 to absorb nutrients from the offspring raising area 24. Then, a nutrient solution containing nutrients is circulated through the water supply device 22, and the first offspring C1, the second offspring C2, and the third offspring C3 are raised to a predetermined growth stage. This allows the growth stages of the first offspring C1, the second offspring C2, and the third offspring C3 to be determined individually. As a result, for example, if the first offspring C1 grows faster than the third offspring C3, the first offspring C1 can be frozen and stored without waiting for the third offspring C3 to reach the predetermined growth stage. This improves the efficiency of the strawberry seedling S production process. The nutrient solution supplied to the seedling raising area 24 may be the same as the nutrient solution supplied to the parent seedling raising area 15, or may be a nutrient solution with different components, concentrations, etc.

[0039] 3. Freezing strawberry seedlings As shown in FIG. 4, the strawberry seedlings S that have grown to a predetermined size by the strawberry seedling growing device 3 are separated from the first runner R1, second runner R2, and third runner R3, respectively, and become independent from the parent plant P. The separated strawberry seedlings S are housed in a freezing storage device 4 for strawberry seedlings S and are frozen and stored until shipment. The strawberry seedlings S are frozen and stored while planted in a culture medium 32 filled in a bag 31. The freezing storage device 4 is a so-called freezer, and freezes and stores the strawberry seedlings S at a temperature of -5.0°C to 0.0°C, preferably -1.5°C to -0.5°C. However, the strawberry seedlings S may also be frozen and stored after being removed from the bag 31.

[0040] Examples of the set conditions other than temperature within the freezer storage device 4 include humidity, wind speed, and air volume.

[0041] As shown in FIG. 5, strawberry seedlings S planted in the culture medium 32 filled in the bag 31 are stored in a tray 41 for frozen storage. The tray 41 includes a plate-shaped top plate 41a and multiple storage compartments 41b recessed downward from the top plate 41a. The storage compartments 41b are tapered downward from the top plate 41a. In this embodiment, the bottom of the storage compartment 41b opens downward. However, the bottom of the storage compartment 41b may be closed by a bottom wall. The strawberry seedlings S are planted in the culture medium 32 contained in the bag 31, and the bag 31 is stored in the storage compartment 41b. The material of the tray 41 is not particularly limited, and any material such as metal, resin, wood, or pulp can be selected as appropriate. The tray 41 in this embodiment is made of resin. However, the tray 41 may be omitted.

[0042] The strawberry seedlings S may be arranged randomly inside the freezer storage device 4, or may be arranged based on a predetermined rule. For example, if a temperature distribution occurs inside the freezer storage device 4, the arrangement of the strawberry seedlings S may be periodically moved to ensure a uniform frozen storage state of the strawberry seedlings S. Conversely, by utilizing the temperature distribution inside the freezer storage device 4, strawberry seedlings S that are preferably frozen and stored at a lower temperature may be arranged in a relatively low temperature area, and strawberry seedlings S that are not preferably stored at a low temperature may be arranged in a relatively high temperature area.

[0043] 4. Shipping The frozen strawberry seedlings S are thawed while planted in the culture medium 32 filled in the bag 31, and are shipped while still planted in the culture medium 32 filled in the bag 31. The strawberry seedlings S may be shipped while still contained in the tray 41, or may be shipped in a shipping container (not shown) different from the tray 41.

[0044] 5. Strawberry seedling S production method An outline of the method for producing strawberry seedlings S according to this embodiment will be described with reference to Fig. 6. In this embodiment, an example is described in which the predetermined shipping period SP is from August to September. However, the predetermined shipping period SP is not limited to the above period.

[0045] 6 shows a growth schedule of strawberry seedlings S from August of a certain year to September two years later. However, the growth schedule of strawberry seedlings S is not limited to the following description.

[0046] The upper part of Figure 6 shows the growth schedule for the strawberry seedlings S for the current season, which is the period from August of a certain year to September one year later. The lower part of Figure 6 shows the growth schedule for the strawberry seedlings S for the next season, which is the period from August one year after a certain year to September two years later. In this embodiment, the period between the start of the specified shipping period SP and the start of the specified shipping period SP for the next year is, for example, from August 1st of the current season to July 31st of the next season.

[0047] In this embodiment, the growing period of the strawberry seedlings S is set to three months, and the strawberry seedlings S are grown sequentially four times a year. However, the growing period of the strawberry seedlings S is not limited to three months, and may be two months or four months or more.

[0048] In this embodiment, the growth schedule for the strawberry seedlings S is set based on the calendar month, but this is not limited to this and it may be set based on the week or the day, and any schedule can be set.

[0049] The growth schedule of the strawberry seedlings S in this embodiment will be explained. In this embodiment, the first growth period GP1 of the current season begins in August, which is the first day of the specified shipping period SP. Although not shown in detail, the fourth growth period GP4 of the previous season is set before the first growth period GP1 of the current season. However, if the strawberry seedlings S are shipped to a warm climate, September to October may be set as the specified shipping period SP. In this case, in the following description, the periods will be read one month later.

[0050] When the strawberry seedlings S are grown during the first growth period GP1 of the current season, it is determined that the strawberry seedlings S can be shipped at the end of October. The strawberry seedlings S are then placed in the freezer storage device 4 and frozen for storage. In this embodiment, the strawberry seedlings S are not frozen for storage in the freezer storage device 4 during the first growth period GP1, and when the first growth period GP1 ends, frozen storage of the strawberry seedlings S grown during the first growth period GP1 begins. The strawberry seedlings S grown during the first growth period GP1 of the current season are frozen for storage until the specified shipping period SP of the current season.

[0051] In this embodiment, the period from November to January of the current season is designated as the second growth period GP2. When the strawberry seedlings S are grown during the second growth period GP2 of the current season, it is determined that the strawberry seedlings S can be shipped at the end of January. The strawberry seedlings S are then housed in the freezer storage device 4 and frozen for storage. The strawberry seedlings S grown during the second growth period GP2 are frozen for storage until the specified shipping period SP of the current season.

[0052] In this embodiment, the period from February to April of the current season is designated as the third growth period GP3. When the strawberry seedlings S are grown during the third growth period GP3 of the current season, it is determined that the strawberry seedlings S can be shipped at the end of April. The strawberry seedlings S are then housed in the freezer storage device 4 and frozen for storage. The strawberry seedlings S grown during the third growth period GP3 are frozen for storage until the specified shipping period SP of the current season.

[0053] In this embodiment, the period from May to July of the current season is designated as the fourth growth period GP4. When the strawberry seedlings S are grown during the fourth growth period GP4 of the current season, it is determined that the strawberry seedlings S can be shipped at the end of July. The strawberry seedlings S are then not frozen and are shipped during the specified shipping period SP, which begins in August. At this time, the strawberry seedlings S grown during the first growth period GP1, the second growth period GP2, and the third growth period GP3, which have been frozen and stored in the freezer storage device 4, are removed from the freezer storage device 4, thawed by a known method, and shipped together with the strawberry seedlings S grown during the fourth growth period. However, within the specified shipping period SP, the strawberry seedlings S can be kept refrigerated in the freezer storage device 4 until they are actually shipped.

[0054] When the scheduled shipping period SP for this season begins on August 1st, the first growing period GP1 for the next season begins, and the strawberry seedlings S begin to grow. The schedule thereafter is the same as for the current season, so redundant explanations will be omitted. In this embodiment, the strawberry seedlings S are not frozen and stored in the freezer storage device 4 between August and October, so maintenance of the freezer storage device 4 can be performed.

[0055] 6. Operation of Strawberry Seedling Production System 1 The operation of the strawberry seedling S production system 1 will be described with reference to Fig. 7. Fig. 7 shows a flowchart relating to the operation of the strawberry seedling S production system 1.

[0056] When the production system 1 for strawberry seedlings S is started, a first growing step is executed (S1) in which strawberry seedlings S are grown within a first growing period GP1 in the growing device 3 for the strawberry seedlings S. The strawberry seedlings S grown in the first growing step are frozen and preserved in the frozen preservation device 4 in a frozen preservation step (S5).

[0057] Furthermore, when the first growing step is completed, a second growing step of growing the strawberry seedlings S within a second growing period GP2 is carried out in the growing device 3 for the strawberry seedlings S (S2). The strawberry seedlings S grown in the second growing step are frozen and preserved in a frozen preservation step (S5).

[0058] Furthermore, when the second growing step is completed, a third growing step of growing the strawberry seedlings S within a third growing period GP3 is executed in the growing device 3 for the strawberry seedlings S (S3). The strawberry seedlings S grown in the third growing step are frozen and preserved in a frozen preservation step (S5).

[0059] If the strawberry seedlings S frozen and stored in the freezer storage device 4 are not within the specified shipping period SP (S6; N), they will continue to be frozen and stored in the freezer storage device 4. On the other hand, if the strawberry seedlings S frozen and stored in the freezer storage device 4 are within the specified shipping period SP (S6; Y), they will be taken out of the freezer storage device 4, thawed, and then shipped (S7).

[0060] Furthermore, when the third growing step is completed, a fourth growing step is executed in the growing device 3 for the strawberry seedlings S to grow the strawberry seedlings S within a fourth growing period GP4 (S4). The strawberry seedlings S grown in the fourth growing step are shipped together with the thawed strawberry seedlings S (S7). With this, the production system 1 for strawberry seedlings S is completed.

[0061] 7. Effects of this form Next, the effects of this embodiment will be described. This embodiment is a method for producing strawberry seedlings S so that the strawberry seedlings S can be shipped within a specified shipping period SP in one year. The method for producing strawberry seedlings S includes a growing process (S1 to S4) for the strawberry seedlings S and a freezing and preserving process (S5) for freezing the strawberry seedlings S. The growing process (S1 to S4) for the strawberry seedlings S involves growing the strawberry seedlings S sequentially multiple times within the period between the start of the specified shipping period SP and the start of the specified shipping period SP of the next year. The freezing and preserving process (S5) for the strawberry seedlings S involves freezing at least the strawberry seedlings S that finished growing before the specified shipping period SP among the multiple batches of strawberry seedlings S in order to ship the multiple batches of strawberry seedlings S that have been grown sequentially multiple times within the specified shipping period SP. According to this embodiment, a sufficient amount of strawberry seedlings S that have been grown sequentially multiple times can be supplied within the specified shipping period SP.

[0062] The freezing and preservation process according to this embodiment freezes multiple batches of strawberry seedlings S that have finished growing before the specified shipping period SP. According to this embodiment, strawberry seedlings S harvested at different times can be shipped within the specified shipping period SP.

[0063] In the growing process according to this embodiment, strawberry seedlings S are grown three or more times in succession between the start of the specified shipping period SP and the start of the specified shipping period SP of the following year, and the frozen storage process freezes two or more batches of strawberry seedlings S. If the strawberry seedlings S grown just before the start of the specified shipping period SP of the following year are harvested so that they can be shipped within the specified shipping period SP, it is possible that the strawberry seedlings S will be shipped without being frozen. This embodiment is effective in such cases.

[0064] The predetermined shipping period SP in this embodiment is set to a period of three months or less, and the frozen storage process involves freezing strawberry seedlings S that have finished growing at least one month before the start of the predetermined shipping period SP. This embodiment is effective, for example, when the predetermined shipping period SP is two months and the growing period of the strawberry seedlings S is three months. However, in cases where the shipping period is adjusted by cultivating in a closed environment, or in cases where the seedlings are cultivated overseas, the predetermined shipping period SP is not limited to the above period. Furthermore, for example, in cases where the seedlings are frozen for a short period of time to promote flower bud differentiation, the period is not limited to the one month period mentioned above.

[0065] The strawberry seedlings S according to this embodiment are grown in a strawberry seedling S growing device 3 arranged inside a building. According to this embodiment, compared to growing strawberry seedlings S outdoors, they are less susceptible to the effects of external environmental factors such as temperature changes, disease, and pests. This allows high-quality strawberry seedlings S to be grown regardless of the growing season.

[0066] The strawberry seedling S growing device 3 in this embodiment comprises a parent plant planter 10 having at least one parent plant seedling raising area 15 in which parent plants P are housed, and a seedling planter 20 having at least one seedling raising area 24 in which seedlings C are housed, and the parent plant seedling raising area 15 and the seedling raising area 24 do not share water.

[0067] According to this embodiment, water is not shared between the parent plant seedling raising area 15 and the child plant seedling raising area 24, which makes it possible to prevent infection of infectious diseases from parent plants P to child plants C, or from child plants C to parent plants P. This makes it possible to supply a sufficient amount of strawberry seedlings S that have been grown sequentially multiple times during a specified shipping period.

[0068] In the parent plant planter 10 according to this embodiment, multiple parent plants P are arranged at intervals. According to this embodiment, since the multiple parent plants P are arranged at intervals, it is possible to prevent infection of infectious diseases between adjacent parent plants P.

[0069] A nutrient solution 12a containing nutrients is supplied to the parent plant raising area 15 of the parent planter 10 in this embodiment, and water 21 not containing nutrients is supplied to the seedling raising area 24 of the seedling planter 20.

[0070] Nutrients are necessary for plant growth. However, if the nutrient-containing nutrient solution 12a becomes contaminated with pathogens, it can become a source of infection. According to this embodiment, the nutrient-containing nutrient solution 12a is supplied to the parent plant raising area 15 of the parent plant planter 10, and nutrient-free water 21 is supplied to the seedling raising area 24 of the seedling planter 20. This prevents the spread of infectious diseases from the parent plant P to the seedlings C. Since the seedlings C receive nutrients from the first to third runners R1 to R3 extending from the parent plant P, the supply of nutrient-free water 21 to the seedlings C has little effect on the growth of the seedlings C.

[0071] The growing device 3 for strawberry seedlings S according to this embodiment further includes a nutrient solution supply unit 12 that supplies nutrient solution 12a to the parent plant planter 10. The nutrient solution supply unit 12 has supply ports 12b for supplying the nutrient solution 12a formed at positions corresponding to each parent plant P. The parent plant planter 10 has outlets 10a for discharging the nutrient solution 12a formed at positions corresponding to each parent plant P.

[0072] According to this embodiment, the nutrient solution 12a that flows into the parent plant planter 10 is supplied to the parent plants P and then discharged from the discharge port 10a. This prevents the nutrient solution 12a from stagnating within the parent plant planter 10. As a result, it is possible to prevent the stagnant nutrient solution 12a from becoming an infection source and infecting the multiple parent plants P placed in the parent planter 10 with infectious diseases.

[0073] The growing device 3 for strawberry seedlings S according to this embodiment further comprises a nutrient solution recovery unit 13 connected to the parent plant planter 10 and recovering the nutrient solution 12a discharged from the parent plant planter 10, and a sterilization device 14 that sterilizes the nutrient solution 12a recovered by the nutrient solution recovery unit 13 and supplies the sterilized nutrient solution 12a to the nutrient solution supply unit 12. According to this embodiment, the nutrient solution 12a supplied to the parent plants P is sterilized and recycled, thereby preventing the parent plants P placed in the parent planter 10 from being infected with infectious diseases.

[0074] The planter for seedlings 20 in this embodiment is configured so that water 21 supplied to the planter for seedlings 20 flows through the bottom surface 20b of the planter for seedlings 20, and the water 21 flowing through the bottom surface 20b is supplied to multiple seedlings C.

[0075] According to this embodiment, it is possible to efficiently water the multiple seedlings C. Note that water 21 that does not contain nutrients is supplied to the seedling planter 20. Therefore, even if the water 21 flowing through the bottom surface 20b of the seedling planter 20 is supplied to the multiple seedlings C, there is little possibility that the multiple seedlings C will become infected with an infectious disease.

[0076] The parent plant planter 10 according to this embodiment is formed long, and a plurality of parent plants P are arranged in the longitudinal direction of the parent plant planter 10. The child plant planter 20 is disposed at least to the side of the parent plant planter 10, and is formed long in a direction intersecting the longitudinal direction.

[0077] According to this embodiment, multiple parent plants P can be arranged along the longitudinal direction in the parent plant planter 10, which is long in the longitudinal direction. This improves the space efficiency of the growing device 3 for strawberry seedlings S. Furthermore, by forming the seedling planter 20 to be long in the cross direction, multiple seedlings C that have developed on runners extending from the parent plant P can be arranged along the cross direction. This further improves the space efficiency of the growing device 3 for strawberry seedlings S.

[0078] The seedling planter 20 in this embodiment has a water supply port 22a for nutrient-free water 21 located at one end side in the cross direction, and a drainage port 20a located at the other end side in the cross direction.

[0079] According to this embodiment, the water 21 supplied to the planter for seedlings 20 flows from the water supply port 22a located at one end in the cross direction to the drain port 20a located at the other end. This prevents the water 21 from stagnating within the planter for seedlings 20, allowing clean water 21 to flow through the planter for seedlings 20. As a result, it is possible to prevent the multiple seedlings C placed in the planter for seedlings 20 from being infected with infectious diseases.

[0080] The planters for offspring 20 according to this embodiment are arranged on both sides of the planter for parent plants 10 in the cross direction.

[0081] According to this embodiment, the planters 20 for seedlings can be arranged on both sides of the planter 10 for parent plants in the crossing direction, thereby improving the space efficiency of the growing device 3 for strawberry seedlings S.

[0082] The planters for seedlings 20 according to this embodiment are arranged in a staggered pattern in the cross direction on both sides of the parent planter 10. According to this embodiment, space can be secured around the planters for seedlings 20 when arranging equipment for the planters for seedlings 20.

[0083] The growing device 3 for strawberry seedlings S according to this embodiment further includes a lighting device 23 that illuminates both the parent plant P and the baby plant C. The lighting device 23 is arranged along the planter 20 for baby plants.

[0084] According to this embodiment, firstly, it is possible to illuminate a plurality of baby plants C arranged in the planter for baby plants 20. The baby plants C arranged in the planter for baby plants 20 are connected to the parent plant P by the first to third runners R1 to R3. Therefore, the lighting device 23 arranged along the planter for baby plants 20 can also illuminate the parent plant P connected to the baby plants C. This eliminates the need to separately provide a lighting device 23 for illuminating the baby plants C and a lighting device 23 for illuminating the parent plant P.

[0085] The seedlings C according to this embodiment are cultivated in a culture medium 32 wrapped in a bag 31 formed into a bag shape using nonwoven fabric. According to this embodiment, roots can grow through the gaps in the nonwoven fabric, so the entire bag 31 can be planted in a field. This makes it possible to prevent damage to the roots of the strawberry seedlings S when planting them in the field.

[0086] The nonwoven fabric according to this embodiment is made of a hydrophilic resin, and the seedling planter 20 has a plurality of seedlings C planted in a culture medium 32 filled in a bag 31. According to this embodiment, the water 21 of the culture medium 32 in the bag 31 formed from the hydrophilic nonwoven fabric can be easily retained.

[0087] In the growing step according to this embodiment, strawberry seedlings S are grown in a state where they are planted in culture medium 32 filled in bags 31, and in the freezing and preserving step (S5), the grown strawberry seedlings S are frozen in a freezer while still planted in culture medium 32 filled in bags 31. According to this embodiment, the strawberry seedlings S can be shipped while still planted in culture medium 32 filled in bags 31. This makes it possible to omit the step of replanting the strawberry seedlings S, thereby preventing damage to the roots of the strawberry seedlings S due to replanting.

[0088] (Embodiment 2) Next, a second embodiment will be described with reference to Fig. 8. In the growing device 3a for strawberry seedlings S according to this embodiment, the planter 20 for seedlings is arranged on one side of the planter 10 for parent plants in the cross direction. In this embodiment, the planter 20 for seedlings is arranged to the left of the planter 10 for parent plants in Fig. 8. However, the planter 20 for seedlings may also be arranged to the right of the planter 10 for parent plants in Fig. 8.

[0089] According to this embodiment, the length dimension in the cross direction can be made smaller than when the planters for seedlings 20 are arranged on both sides of the planter for parent plants 10 in the cross direction.

[0090] Note that, among the symbols used in the second and subsequent embodiments, the same symbols as those used in the previous embodiments represent the same components, etc. as those in the previous embodiments, unless otherwise specified.

[0091] (Embodiment 3) Next, a growing device 3b for strawberry seedlings S according to a third embodiment will be described with reference to Fig. 9. In this embodiment, the planters 20 for seedlings are arranged on both sides of the planter 10 for parent plants in the cross direction. The planters 20 for seedlings are also arranged symmetrically with the planter 10 for parent plants as the center of symmetry.

[0092] Two first runners R1 extend from the parent plant P. The two first runners R1 extend in opposite directions. One of the two first runners R1 extends to the left of the parent plant planter 10 in FIG. 9, and the other first runner R1 extends to the right of the parent plant planter 10 in FIG. 9. A plurality of seedlings C are generated from each of the two first runners R1. In this embodiment, two seedling planters 20 are arranged for one parent plant P.

[0093] According to this embodiment, the planters 20 for seedlings can be arranged on both sides of the planter 10 for parent plants in the crossing direction, thereby improving the space efficiency of the growing device 3 for strawberry seedlings S.

[0094] Furthermore, two first runners R1 extend from one parent plant P, and multiple offspring C are generated from each first runner R1, so that the production efficiency of offspring C can be improved.

[0095] (Embodiment 4) Next, with reference to Fig. 10, a growing device 3c for strawberry seedlings S according to a fourth embodiment will be described. In this embodiment, the planter for seedlings 50 is formed so as to extend from one side to the other in the cross direction relative to the planter for parent plants 10. In Fig. 10, the planter for seedlings 50 is formed long, extending from the left side to the right side of the planter for parent plants 10. In this embodiment, three planters for seedlings 50 are arranged side by side with a gap between them in the longitudinal direction. The planter for parent plants 10 is arranged above the planter for seedlings 50.

[0096] In this embodiment, the planters for seedlings 50 are arranged symmetrically with respect to the parent plant planter 10. However, the planters for seedlings 50 may also be arranged asymmetrically with respect to the parent plant planter 10. In other words, the length of the left side of the planter for seedlings 50 may be different from the length of the right side of the planter for seedlings 50 with respect to the parent plant planter 10.

[0097] A water supply device 22 is disposed at one end (the left end in FIG. 10) of the planter for seedlings 50 of this embodiment. A drainage outlet 20a is disposed at the other end (the right end in FIG. 10) of the planter for seedlings 50. Inside the planter for seedlings 50, water 21 flows from the left to the right in FIG. 10.

[0098] The planter for seedlings 50 according to this embodiment is formed so as to extend from one side to the other in the cross direction relative to the parent planter 10. According to this embodiment, the planter for seedlings 50 can be arranged so as to extend from one side to the other of the parent planter 10 in the cross direction, thereby improving the space efficiency of the growing device 3 for strawberry seedlings S.

[0099] (Embodiment 5) The fifth embodiment will be described with reference to Figures 11 and 12. Figure 11 shows a growth schedule of strawberry seedlings S according to this embodiment.

[0100] In this embodiment, the strawberry seedlings S grown in the first to fourth growth periods GP1 to GP4 during the period from August to September are shipped sequentially. This allows the shipping work of the strawberry seedlings S to be distributed, thereby reducing the burden of the shipping work.

[0101] For example, strawberry seedlings S grown in the first growth period GP1 are shipped from early to mid-August. Strawberry seedlings S grown in the second growth period GP2 are shipped from mid to late August. Strawberry seedlings S grown in the third growth period GP3 are shipped from early to mid-September. Strawberry seedlings S grown in the fourth growth period GP4 are shipped from mid to late September. All strawberry seedlings S may be shipped on one day, or may be shipped over multiple days.

[0102] In this embodiment, the strawberry seedlings S are judged ready for shipping at the end of July when the fourth growing period GP4 ends. After that, the strawberry seedlings S are frozen and preserved in the frozen storage device 4 until they are shipped in mid-September.

[0103] The growth schedule for strawberry seedlings S next season will be the same as this season, so we will omit redundant explanations.

[0104] FIG. 12 is a flowchart relating to the operation of the strawberry seedlings S production system 1 according to this embodiment.

[0105] In this embodiment, when the third growing step is completed, a fourth growing step of growing the strawberry seedlings S within a fourth growing period GP4 is executed in the growing device 3 for the strawberry seedlings S (S40). The strawberry seedlings S grown in the fourth growing step are frozen and preserved in a frozen preservation step (S5).

[0106] If the strawberry seedlings S frozen and stored in the freezer storage device 4 are not within the specified shipping period SP (S6; N), they will continue to be frozen and stored in the freezer storage device 4. On the other hand, if the strawberry seedlings S frozen and stored in the freezer storage device 4 are within the specified shipping period SP (S6; Y), they will be removed from the freezer storage device 4, thawed, and then shipped (S7). The configuration other than the above is the same as in embodiment 1, so duplicated explanations will be omitted.

[0107] In this embodiment, the strawberry seedlings S grown in the strawberry seedling growing device 3 are temporarily frozen and stored in the frozen storage device 4. This makes it possible to adjust the shipping time of the strawberry seedlings S.

[0108] (Embodiment 6) Next, a growth schedule for strawberry seedlings S according to the sixth embodiment will be described with reference to Fig. 13. In this embodiment, strawberry seedlings S grown in first to fourth growth periods GP1 to GP4 within the period from August to September are shipped at different times.

[0109] For example, strawberry seedlings S grown in the first growth period GP1 are shipped from mid to late August. Strawberry seedlings S grown in the second growth period GP2 are shipped from early to mid-September. Strawberry seedlings S grown in the third growth period GP3 are shipped from mid to late September. On the other hand, strawberry seedlings S grown in the fourth growth period GP4 are shipped from early to mid-August. In this way, the strawberry seedlings S grown in the fourth growth period GP4 may be configured not to be frozen and preserved in the freezer preservation device 4.

[0110] The growth schedule for strawberry seedlings S in the next period will be the same as this period, so we will omit redundant explanations.

[0111] (Embodiment 7) Next, a seventh embodiment will be described with reference to Figures 14 and 15. A growing device 3d for strawberry seedlings S according to this embodiment differs from the first embodiment in that it includes a parent plant raising plate 16 (an example of a parent plant raising tool) instead of the parent planter 10, and a seedling raising plate 25 (an example of a seedling raising tool) instead of the seedling planter 20.

[0112] The parent plant seedling raising plate 16 is formed in the shape of a long plate in the longitudinal direction. The parent plant seedling raising plate 16 has a plurality of parent plant seedling raising areas 15 (five in this embodiment) formed at intervals in the longitudinal direction. The parent plant seedling raising areas 15 are formed by being depressed downward from the parent plant seedling raising plate 16 in a concave shape. One parent plant P is housed in each parent plant seedling raising area 15.

[0113] The growing device 3d according to this embodiment includes a seedling raising plate 25 on both sides of the parent seedling raising plate 16 in a direction intersecting the longitudinal direction of the parent seedling raising plate 16. The seedling raising plate 25 may be configured to be disposed on one side of the parent seedling raising plate 16.

[0114] The seedling raising plate 25 is formed in the shape of a flat plate in the vertical direction. The seedling raising plate 25 has a plurality of seedling raising areas 24 arranged at intervals in the longitudinal direction and at intervals in the transverse direction. The seedling raising areas 24 are formed by recessing downward from the seedling raising plate 25. Each seedling raising area 24 accommodates one seedling C. In this embodiment, a first seedling C1, a second seedling C2, and a third seedling C3 are each arranged in a seedling raising area 24 (see FIG. 15).

[0115] Water supply devices 22 that are long in the longitudinal direction are arranged on the upper surface of the seedling raising plate 25. In this embodiment, the water supply devices 22 are arranged at intervals in the cross direction. However, the water supply devices 22 may be configured to be long in the cross direction and arranged at intervals in the longitudinal direction.

[0116] The water supply device 22 is formed in a hollow cylindrical shape, and is formed so that a liquid can flow through the hollow interior. The water supply device 22 can be formed from any material, such as plastic, rubber, or metal. Although not shown in detail, the water supply device 22 has a water supply port that opens near the seedlings C. The liquid flowing inside the water supply device 22 is supplied to the seedlings C from the water supply port.

[0117] Water not containing nutrients may be circulated inside the water supply device 22, or a solution containing nutrients may be circulated inside the water supply device 22.

[0118] In this embodiment, one parent plant seedling raising plate 16 is configured to have multiple parent plant seedling raising areas 15, but this is not limited to this, and one parent plant seedling raising plate 16 may also be configured to have one parent plant seedling raising area 15.

[0119] In addition, in this embodiment, one seedling raising plate 25 is configured to have multiple seedling raising areas 24, but this is not limited to this, and one seedling raising plate 25 may also be configured to have one seedling raising area 24.

[0120] Alternatively, the parent seedling raising plate 16 and the child seedling raising plate 25 may be integrally molded to form one seedling raising plate, and the parent seedling raising area 15 and the child seedling raising area 24 may be formed on this seedling raising plate.

[0121] The present invention is not limited to the above-described embodiments, and can be applied to various embodiments within the scope of the present invention. [Explanation of symbols]

[0122] 1: production system, 2: plant factory, 3, 3a, 3b, 3c: growth device, 4: freezing storage device, 10: planter for parent plants, 10a: drain outlet, 11: culture medium, 12: nutrient solution supply unit, 12a: nutrient solution, 12b: supply port, 13: nutrient solution recovery unit, 14: sterilization device, 15: parent planting area, 16: parent planting plate, 20, 50: planter for seedlings, 20a: drain outlet, 20b: bottom, 21: water, 22: water supply device, 22a: water supply port , 23: lighting device, 24: seedling raising area, 25: seedling raising plate, 31: bag body, 31a: opening, 32: medium, C: seedling, C1: first seedling, C2: second seedling, C3: third seedling, P: parent plant, R1: first runner, R2: second runner, R3: third runner, S: strawberry seedling, S1: first growth process, S2: second growth process, S3: third growth process, S4: fourth growth process, S5: frozen storage process, SP: specified shipping period

Claims

1. A method for producing strawberry seedlings so that the strawberry seedlings can be shipped within a predetermined shipping period of one year, A strawberry seedling growing process in which the strawberry seedlings are grown multiple times between the start of the specified shipping period and the start of the specified shipping period of the next year; The method for producing strawberry seedlings includes a frozen storage step of freezing at least the strawberry seedlings that have finished growing before the specified shipping period among the multiple batches of strawberry seedlings that have been grown sequentially multiple times, in order to ship the multiple batches of strawberry seedlings within the specified shipping period.

2. The method for producing strawberry seedlings according to claim 1 , wherein the frozen storage step freezes a plurality of batches of the strawberry seedlings that have finished growing before the specified shipping period.

3. The growing step includes growing the strawberry seedlings three or more times in succession between the start of the specified shipping period and the start of the specified shipping period of the next year, The method for producing strawberry seedlings according to claim 2 , wherein the frozen storage step freezes two or more batches of the strawberry seedlings.

4. The predetermined shipping period is set to a period of three months or less, The method for producing strawberry seedlings according to claim 1 , wherein the frozen storage step freezes the strawberry seedlings that have finished growing at least one month before the start of the specified shipping period.

5. The method for producing strawberry seedlings according to claim 1 , wherein the strawberry seedlings are grown by a strawberry seedling growing device arranged inside a building.

6. The strawberry seedling growing device includes: a parent plant raising tool having at least one parent plant raising area in which the parent plants are accommodated; a seedling raising tool having at least one seedling raising area in which seedlings are accommodated; The method for producing strawberry seedlings according to claim 5 , wherein the parent plant seedling raising area and the child plant seedling raising area do not share water.

7. The method for producing strawberry seedlings according to claim 6, wherein different liquids are supplied to the parent plant raising area and the child plant raising area.

8. A nutrient solution containing nutrients is supplied to the parent plant seedling raising area, 8. The method for producing strawberry seedlings according to claim 7, wherein the seedling raising area is supplied with water that does not contain nutrients.

9. The seedling raising area includes: When the seedlings are connected to the runner, water containing no nutrients is supplied, The method for producing strawberry seedlings according to claim 8, wherein the nutrient solution containing nutrients is supplied after the runners are cut.

10. The strawberry seedling growing device further includes: a nutrient solution supply unit that supplies the nutrient solution to the parent plant seedling raising area, the nutrient solution supply unit has supply ports formed at positions corresponding to each of the parent plants for supplying the nutrient solution; 9. The method for producing strawberry seedlings according to claim 8, wherein the parent plant raising area has outlets formed at positions corresponding to the parent plants, through which the nutrient solution is discharged.

11. The method for producing strawberry seedlings according to claim 6, wherein the water supplied to the seedling raising area is supplied to a plurality of the seedlings.

12. a parent plant raising tool having at least one parent plant raising area that shares water with the parent plant; a seedling raising tool having at least one seedling raising area that shares water with the seedlings; A strawberry seedling growing device in which the parent plant seedling raising area and the child plant seedling raising area do not share water.

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