Kelp Multi-layer Three-dimensional Seedling Device and Seedling Cultivation Method

Abstract

This invention discloses a multi-layer vertical seedling device and method for kelp. The seedling device includes a seedling frame and several layers of seedling trays. The height of the seedling trays is adjustable. A dynamic shading curtain is installed at the top of the seedling frame. A supplemental lighting unit, a flow control unit, and an environmental monitoring unit are installed on each seedling tray. Normal seedling cultivation is performed on the first layer of seedling trays. In the early stage of seedling attachment on the second layer of seedling trays, white light is emitted by the supplemental lighting unit of the second layer to promote the attachment and germination of zoospores to form gametophytes. Subsequently, the supplemental lighting unit of the second layer of seedling trays emits red and blue light, with the proportion of red light being greater than that of blue light. During the extended cultivation stage on the second layer of seedling trays, moderate light intensity red light is used as the main source and blue light as a supplement to slow growth while ensuring the accumulation of photosynthetic products, increasing the chlorophyll content of seedlings, enhancing adhesion, reducing diseases and seedling rot, and improving the stability and yield of seedlings.

Description

Technical Field

[0001] This invention belongs to the field of kelp seedling technology, specifically, it relates to a multi-layer vertical kelp seedling device and seedling method. Background Technology

[0002] Kelp is a large economic seaweed with both edible and medicinal value, and it is also a pillar industry of my country's algae farming industry. The summer seedling cultivation method for kelp advances the seedling time from autumn to summer, prolonging the growth period of kelp at sea and significantly increasing kelp farming yield. To this day, it remains the core technology used by the vast majority of kelp seedling enterprises.

[0003] Traditional summer seedling cultivation involves collecting kelp spores in summer and cultivating them in indoor seedling tanks for 60 to 80 days. Once the seawater temperature drops to a suitable range, the spores are then released into the sea for aquaculture. This method produces only one batch of seedlings per year, resulting in a high rate of idle facilities during the off-season. To improve the utilization rate of seedling facilities and increase output per unit volume of water, the industry has explored multi-batch seedling cultivation techniques. One widely used method is the cultivation of two batches of kelp seedlings. The core process involves arranging seedling trays in two layers within the same seedling tank during the initial seedling collection. The upper layer receives natural light and develops normally into the first batch of seedlings; the lower layer, shaded by the upper layer, is in a low-light environment, significantly inhibiting its growth. After the upper layer of seedlings is released, the light intensity for the lower layer is increased, allowing it to rapidly develop to the required standard within approximately 30 days. Theoretically, this method can obtain an additional batch of seedlings at a lower cost, filling market gaps.

[0004] Current double-cropping seedling technology faces severe challenges in actual production. The core problem lies in the fact that the lower seedlings are constantly under low light stress (300–800 lux) during the critical growth period of over 60 days. This severely restricts photosynthesis, leading to insufficient accumulation of organic matter in the seedlings, resulting in weak vitality and generally poor overall health. These inherently weak seedlings are more sensitive to environmental changes during the later rapid cultivation stages, making them highly susceptible to diseases such as "green rot," causing large-scale seedling loss and rot, and making it difficult to guarantee seedling quality and delivery rate.

[0005] Furthermore, the technology is limited by a simple "one-to-two" stratification model, which prevents further expansion of cultivation, and the utilization rate and unit output of seedling facilities remain limited.

[0006] Therefore, how to overcome the shortcomings of existing kelp seedling cultivation, such as weak seedlings, high risk of disease, and difficulty in expanding the number of seedlings due to insufficient light over a long period of time, and provide a new device and method that can ensure the healthy growth of multiple seedlings, improve seedling stability, and increase the productivity per unit water body, is a technical problem that urgently needs to be solved in this field.

[0007] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this application, and therefore may include prior art that is not known to those skilled in the art. Summary of the Invention

[0008] This invention proposes a multi-layer vertical kelp seedling raising device and a kelp seedling raising method to solve the technical problem of easy seedling detachment and rotting caused by long-term weak light suppression in existing seedling production of kelp second-crop seedlings.

[0009] Furthermore, it can also solve the technical problem that the cultivation of second-crop seedlings cannot be expanded to multiple-crop seedlings.

[0010] To achieve the above-mentioned invention / design objectives, the present invention adopts the following technical solution: A multi-layer vertical seedling raising device for kelp includes a seedling frame and several layers of seedling trays located within the seedling frame. The seedling trays are used to hold seedling curtains. The height of the seedling trays within the seedling frame is adjustable. The vertical seedling raising device includes: A dynamic shading curtain is located at the top of the seedling frame; Supplemental lighting unit, each layer of the seedling tray is equipped with the supplemental lighting unit; A flow control unit is installed on each layer of the seedling tray, and the flow control unit is used to regulate the water flow rate. An environmental monitoring unit is installed on each layer of the seedling tray. The environmental monitoring unit is used to monitor light intensity and send the data to the controller. After the seedling curtain is placed on the first and second seedling trays distributed from top to bottom, the controller is used to control the dynamic shading curtain and the supplemental lighting unit of the first seedling tray to cultivate the seedlings of the first seedling tray under white light within the first light intensity range; and to control the flow control unit of the first seedling tray to increase the water flow rate according to the cultivation time. The controller is used for extended cultivation of the second batch of seedlings on the second-layer seedling tray: In the early stages of seedling attachment on the second-layer seedling tray, the controller uses the supplemental lighting unit of the second-layer seedling tray to emit white light within a second light intensity range to promote the attachment and germination of zoospores to form gametophytes. Subsequently, the controller controls the supplemental lighting unit of the second-layer seedling tray to emit red and blue light within a third light intensity range, where the proportion of red light is greater than the proportion of blue light. When the light intensity is lower than the lower limit of the third light intensity range, the controller controls the supplemental lighting unit of the second-layer seedling tray to supplement only red light. The controller also controls the flow control unit of the second-layer seedling tray to use static or micro-flow water for cultivation. Before the first batch of seedlings on the first-layer seedling tray is removed from storage, at a first set time, the controller controls the supplemental lighting unit of the second-layer seedling tray to reduce the proportion of red light and increase the proportion of blue light. Before the second set time, the controller controls the supplemental lighting unit of the second-layer seedling tray to emit only blue light to cultivate the second batch of seedlings. After the first batch of seedlings is removed from storage, the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The controller controls the dynamic shading curtain and the supplemental lighting unit of the first-layer seedling tray so that the light at the first-layer seedling tray is within a first light intensity range. The controller controls the flow control unit of the first-layer seedling tray to control the water flow rate within a first flow rate range. In the later stage of cultivation, the water flow rate is controlled within a second flow rate range until the second batch of seedlings is removed from storage.

[0011] As described above, in the multi-layer vertical kelp seedling device, a third seedling tray is installed below the second seedling tray. After the seedling curtain is placed on the first and second seedling trays for a set time, the seedling curtain with second-harvested seedlings is placed on the third seedling tray for extended cultivation of the third batch of seedlings. The controller is used to cultivate the seedlings in the early stage of seedling attachment on the third seedling tray by emitting white light within the second light intensity range through the supplementary lighting unit of the third seedling tray, promoting the attachment and germination of zoospores to form gametophytes. Afterward, the controller controls the supplementary lighting unit of the third seedling tray to emit red light, with the light intensity within the fourth light intensity range. When the light intensity is lower than the lower limit of the fourth light intensity range, the controller controls the supplementary lighting unit of the third seedling tray to supplement only red light. The controller also controls the flow control unit of the third seedling tray to cultivate the seedlings in still or slightly flowing water. After the first batch of seedlings is taken out of the warehouse, the third layer of seedling trays is raised to the second layer to form the second layer of seedling trays. The controller controls the third batch of seedlings to undergo a second delayed cultivation: the controller controls the supplementary lighting unit of the second layer of seedling trays to emit red and blue light within the third light intensity range, wherein the proportion of red light is greater than the proportion of blue light, and controls the flow control unit of the second layer of seedling trays to carry out cultivation in still water or micro-flow water. Before the second batch of seedlings is removed from storage, at a first set time, the controller controls the supplemental lighting unit of the second-layer seedling tray to reduce the proportion of red light and increase the proportion of blue light. At a second set time before removal from storage, the controller controls the supplemental lighting unit of the second-layer seedling tray to emit only blue light to cultivate the third batch of seedlings. After the second batch of seedlings is removed from storage, the third batch of seedlings is raised to the first layer, and the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The controller controls the supplemental lighting unit of the first-layer seedling tray to emit white light within a first light intensity range for cultivation. The controller controls the flow control unit of the first-layer seedling tray to control the water flow rate within a first flow rate range. In the later stage of cultivation, the water flow rate is controlled within a second flow rate range until the third batch of seedlings is removed from storage.

[0012] In the kelp multi-layer vertical seedling device described above, when the controller controls the supplementary lighting unit to emit red and blue light, the proportion of red light exceeds 90% and the proportion of blue light is less than 10%.

[0013] In the kelp multi-layer vertical seeding device described above, after more than 80% of the zoospores have formed gametophytes, the controller controls the supplementary lighting unit to emit red and blue light. As described above, in the kelp multi-layer vertical seedling device, the supplemental lighting unit is distributed in an S-shape on the seedling tray, the flow control unit is located on the two short sides of the seedling tray, and the environmental monitoring unit is located on the long side of the seedling tray.

[0014] In the kelp multi-layer vertical seeding device described above, the environmental monitoring unit is used to monitor the water flow rate and send the data to the controller.

[0015] A method for cultivating kelp seedlings based on a multi-layer vertical seeding device, wherein the multi-layer vertical seeding device includes: Seedling frame; Several layers of seedling trays are located within the seedling frame. The seedling trays are used to hold seedling curtains, and the height of the seedling trays within the seedling frame is adjustable. A dynamic shading curtain, located at the top of the seedling frame, adjusts the light intensity of the seedling tray; Supplemental lighting unit, each layer of the seedling tray is equipped with the supplemental lighting unit; A flow control unit is installed on each layer of the seedling tray, and the flow control unit is used to regulate the water flow rate. An environmental monitoring unit is installed on each layer of the seedling tray, and the environmental monitoring unit is used to monitor light intensity at least. The method for cultivating kelp seedlings is as follows: The seedling tray is placed on the first and second seedling trays distributed from top to bottom. The dynamic shading curtain and the supplemental lighting unit of the first seedling tray are controlled to cultivate the seedlings of the first seedling tray under white light within the first light intensity range. The flow control unit of the first seedling tray is controlled to increase the water flow rate according to the cultivation time. Extended cultivation is carried out on the second batch of seedlings on the second-layer seedling tray: In the early stage of seedling attachment on the second-layer seedling tray, white light within the second light intensity range is emitted by the supplemental lighting unit of the second-layer seedling tray to promote the attachment and germination of zoospores to form gametophytes. Then, the supplemental lighting unit of the second-layer seedling tray is controlled to emit red and blue light within the third light intensity range, wherein the proportion of red light is greater than the proportion of blue light. When the light intensity is lower than the lower limit of the third light intensity range, the supplemental lighting unit of the second-layer seedling tray is controlled to supplement only red light; the flow control unit of the second-layer seedling tray is controlled to carry out cultivation in still water or micro-flow water. Before the first batch of seedlings on the first-layer seedling tray is removed from storage, at a first set time, the supplemental lighting unit of the second-layer seedling tray is controlled to reduce the proportion of red light and increase the proportion of blue light. Before the second set time, the supplemental lighting unit of the second-layer seedling tray is controlled to emit only blue light to cultivate the second batch of seedlings. After the first batch of seedlings is removed from storage, the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The dynamic shading curtain and the supplemental lighting unit of the first-layer seedling tray are controlled so that the light at the first-layer seedling tray is within the first light intensity range. The flow control unit of the first-layer seedling tray is controlled to control the water flow rate within the first flow rate range. In the later stage of cultivation, the water flow rate is controlled within the second flow rate range until the second batch of seedlings is removed from storage.

[0016] As described above, in the kelp seedling cultivation method, a third seedling tray is set below the second seedling tray. After the seedling curtain is placed on the first and second seedling trays for a set time, the seedling curtains from the second harvest are placed on the third seedling tray for extended cultivation of the third batch of seedlings. In the early stage of seedling attachment on the third seedling tray, white light within the second light intensity range is emitted by the supplementary lighting unit of the third seedling tray to promote the attachment and germination of zoospores to form gametophytes. Then, the supplementary lighting unit of the third seedling tray is controlled to emit red light, with the light intensity within the fourth light intensity range. When the light intensity is lower than the lower limit of the fourth light intensity range, the supplementary lighting unit of the third seedling tray is controlled to supplement only red light. The flow control unit of the third seedling tray is controlled to carry out cultivation in still water or micro-flow water. After the first batch of seedlings is taken out of the warehouse, the third layer of seedling trays is raised to the second layer to form the second layer of seedling trays. The third batch of seedlings is controlled to undergo a second delayed cultivation: the supplementary lighting unit of the second layer of seedling trays is controlled to emit red and blue light within the third light intensity range, wherein the proportion of red light is greater than the proportion of blue light. The flow control unit of the second layer of seedling trays is controlled to carry out cultivation in still water or micro-flow water. Before the second batch of seedlings is removed from storage, at a first set time, the supplemental lighting unit of the second-layer seedling tray is controlled to reduce the proportion of red light and increase the proportion of blue light. At a second set time before removal from storage, the supplemental lighting unit of the second-layer seedling tray is controlled to emit only blue light to cultivate the third batch of seedlings. After the second batch of seedlings is removed from storage, the third batch of seedlings is raised to the first layer, and the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The supplemental lighting unit of the first-layer seedling tray is controlled to emit white light within a first light intensity range for cultivation. The flow control unit of the first-layer seedling tray is controlled to control the water flow rate within a first flow rate range. In the later stage of cultivation, the water flow rate is controlled within a second flow rate range until the third batch of seedlings is removed from storage.

[0017] In the kelp seedling cultivation method described above, when the supplementary lighting unit emits red and blue light, the proportion of red light exceeds 90% and the proportion of blue light is less than 10%.

[0018] In the kelp seedling cultivation method described above, after more than 80% of the zoospores have formed gametophytes, the supplementary lighting unit is controlled to emit red and blue light.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are: This invention relates to a multi-layer vertical seedling device for kelp, comprising a seedling frame and several layers of seedling trays located within the frame. The height of the trays within the seedling frame is adjustable. A dynamic shading curtain is installed at the top of the frame. Supplemental lighting units, flow control units, and environmental monitoring units are installed on the trays. Normal seedling cultivation is performed on the first layer of trays. In the early stages of seedling attachment on the second layer, white light within a second light intensity range is emitted by the supplemental lighting unit of the second layer to promote the attachment and germination of zoospores, forming gametophytes. Subsequently, the supplemental lighting unit of the second layer emits red and blue light within a third light intensity range, with red light predominating while blue light predominating. During the extended cultivation stage on the second layer, medium-intensity red light is used as the primary source, supplemented by blue light, to slow growth while ensuring the accumulation of photosynthetic products, increasing chlorophyll content in seedlings, enhancing adhesion, reducing diseases and seedling rot, and improving seedling stability and yield.

[0020] This invention relates to a kelp seedling cultivation method based on a multi-layer vertical kelp seedling device. The first layer of seedling trays is used for normal seedling cultivation. In the early stages of seedling attachment on the second layer of seedling trays, white light within a second light intensity range is emitted by the supplemental lighting unit of the second layer to promote zoospore attachment, germination, and gametophyte formation. Subsequently, the supplemental lighting unit of the second layer of seedling trays emits red and blue light within a third light intensity range, with red light predominating over blue light. During the extended cultivation stage on the second layer of seedling trays, medium-intensity red light is used as the primary source, supplemented by blue light, to slow growth while ensuring the accumulation of photosynthetic products, increasing chlorophyll content in seedlings, enhancing adhesion, reducing disease and seedling rot, and improving seedling stability and yield.

[0021] Other features and advantages of the present invention will become clearer after reading the detailed embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of a multi-layer vertical seeding device for kelp according to a specific embodiment of the present invention.

[0024] In the picture: 11-Seedling frame; 12-Seedling trays; 2-Dynamic blackout curtain; 3-Supplemental lighting unit; 4-Flow control unit; 5-Environmental monitoring unit. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0027] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. In the description of embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] A multi-layer vertical kelp seedling device includes a seedling frame 11, a seedling tray 12, a dynamic shading curtain 2, a supplementary lighting unit 3, a flow control unit 4, an environmental monitoring unit 5, and a controller.

[0031] The seedling frame 11 forms the frame of the three-dimensional seedling device, and the seedling frame is a rectangular seedling frame.

[0032] Several layers of seedling trays 12 are set inside the seedling frame 11. The seedling trays 12 are used to place the seedling curtains, so as to realize the layered cultivation of kelp seedlings, improve the water utilization rate, and provide a space basis for multiple cultivation.

[0033] The frame and brackets are made of transparent materials resistant to seawater corrosion (such as high-strength acrylic) to minimize light shading. The dimensions are: 1.5-2 meters long, 0.6-0.8 meters wide, and 0.5-0.7 meters high.

[0034] The height of the seedling tray 12 within the seedling frame 11 is adjustable. Specifically, the seedling tray 12 can be fixed to the seedling frame 11 by a fixing mechanism and manually adjusted, or the seedling tray 12 can be raised and lowered within the seedling frame 11 by a lifting mechanism to achieve height adjustment.

[0035] The dynamic shading curtain 2 is located at the top of the seedling frame 11 and is used to adjust the light intensity of the seedling tray 12.

[0036] The supplementary lighting unit 3 is used to provide supplementary lighting for the seedling tray 12. Each layer of the seedling tray 12 is equipped with a supplementary lighting unit 3.

[0037] The supplemental lighting units are arranged in an S-shape on the seedling tray.

[0038] The supplemental lighting unit consists of S-shaped waterproof LED light strips, which are fixedly laid on the lower surface of each seedling tray, facing the seedlings in that layer. The light strips are connected by independent waterproof power cords. Each layer is equipped with a separate switch and light intensity and spectrum adjustment module, which can independently adjust the light intensity ratio of red light (wavelength 620-660nm) and blue light (wavelength 450-470nm) to realize red light mode (delayed cultivation), blue light mode (transition from delayed cultivation to rapid cultivation) and white light mode (full spectrum) (used for conventional and rapid cultivation of a single batch of seedlings).

[0039] The flow control unit 4 is used to regulate the water flow rate, and each layer of seedling tray 12 is equipped with the flow control unit 4.

[0040] The flow control unit is located on the two short sides of the seedling tray. The flow control unit is a guide fan fixedly installed in the center of the 12 short sides of each layer of the seedling tray. The speed can be adjusted to regulate the water flow velocity of each layer, in accordance with the different respiration and growth needs of each layer of seedlings. Environmental monitoring unit 5 is used to monitor environmental parameters, and each layer of seedling tray 12 is equipped with environmental monitoring unit 5. Environmental monitoring unit 5 includes at least a light intensity detection module, which is used to monitor light intensity and send it to the controller.

[0041] The environmental monitoring unit is located on the long side of the seedling tray. Installed in the center of the long side of each tray, the unit includes integrated sensors and a data transmission module. The integrated sensors include water temperature, light, flow rate, dissolved oxygen, and salinity sensors, enabling real-time monitoring of the seedling growth environment at each level.

[0042] When a first-layer seedling tray and a second-layer seedling tray are arranged sequentially from top to bottom within the seedling frame 11, it is possible to cultivate one-time seedlings and two-time seedlings.

[0043] After the seedling tray is placed on the first and second seedling trays distributed from top to bottom, the controller controls the dynamic shading curtain and the supplemental lighting unit of the first seedling tray to conduct white light cultivation of the first batch of seedlings on the first seedling tray within the first light intensity range: Light adjustment is performed on the first batch of seedlings on the first layer of seedling trays to ensure normal growth under white light (full spectrum): The controller controls the dynamic shading curtain and the supplemental lighting unit of the first layer of seedling trays so that the light on the first layer of seedling trays is within the first light intensity range (1000-3000 lux). When the first layer of seedling trays needs supplemental lighting (i.e., the light intensity is lower than the lower limit of the first light intensity range, <1000 lux), the dynamic shading curtain is controlled not to block light and the supplemental lighting unit of the first layer of seedling trays emits white light. When the light intensity is higher than the preset light intensity (e.g., light intensity >3000 lux), the dynamic shading curtain is controlled to block light.

[0044] The controller controls the flow control unit of the first-layer seedling tray to increase the water flow rate according to the cultivation time.

[0045] Specifically, in the early stage of seedling attachment (about 1-15 days after seedling collection), the seedlings are cultivated in still or slightly flowing water (1-2 cm / s) to avoid disturbance and mechanical damage to spore attachment and germination caused by water flow. During the seedling growth period (about 15 to 40 days after seedling collection), the water flow is controlled at 5-8 cm / s by the flow control unit to increase nutrient and gas exchange, remove metabolic waste, and promote seedling growth. During the strong seedling stage before leaving the warehouse (about 41 to 60 days after seedling collection), the water flow is increased to 10-15 cm / s to stimulate rapid seedling growth and enhance attachment.

[0046] The controller is used to extend the cultivation time of the second batch of seedlings on the second layer of seedling trays: The controller is used to cultivate the second crop of seedlings on the second-layer seedling tray by emitting white light within the second light intensity range (1000-2000 lux) through the supplementary lighting unit of the second-layer seedling tray in the early stage of seedling attachment, promoting the attachment and germination of zoospores to form gametophytes (about 10-15 days). After more than 80% of the gametophytes have formed under a microscope, the controller controls the supplementary lighting unit of the second-layer seedling tray to emit red and blue light within the third light intensity range (800-1200 lux), with the proportion of red light > the proportion of blue light. The red light is used to inhibit the development of gametophytes into sporophytes and delay the growth of the second crop of seedlings.

[0047] Of these, red light accounts for over 90%, while blue light accounts for less than 10%.

[0048] The controller is used to control the supplemental lighting unit of the second-layer seedling tray to supplement only red light when the light intensity is below the lower limit (800 lux) of the third light intensity range.

[0049] The controller controls the flow control unit of the second-layer seedling tray to carry out delayed cultivation with static or micro-flow water, maintain basic nutrient exchange and dissolved oxygen requirements, reduce physical disturbance, and reduce gamete metabolic consumption.

[0050] Before the first batch of seedlings leaves the first-layer seedling tray, at the first set time (10-15 days), the controller controls the supplemental lighting unit of the second-layer seedling tray to reduce the proportion of red light and increase the proportion of blue light, while keeping the light intensity constant. At the second set time (5 days) before leaving the tray, the controller controls the supplemental lighting unit of the second-layer seedling tray to emit only blue light to cultivate the second batch of seedlings. Blue light is used to induce and promote the development of gametophytes into sporophytes, preparing for the transition to rapid cultivation. After the first batch of seedlings leaves the tray, the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The controller controls the dynamic shading curtain and the supplemental lighting unit of the first-layer seedling tray to ensure that the light intensity at the first-layer seedling tray is within the first light intensity range (1000-3000 lux) for rapid cultivation.

[0051] In the early stage of spore seedling growth (about 10 days before rapid cultivation), the controller controls the flow rate of the first layer of seedling trays to control the water flow rate within the first flow rate range (5-8 cm / s), stimulating seedling growth and enhancing adhesion. In the later stage of cultivation, the controller controls the water flow rate within the second flow rate range (10-15 cm / s), increasing nutrient and gas exchange, removing metabolic waste, and accelerating the growth of the second batch of seedlings before they are released from storage.

[0052] When the first, second, and third seedling trays are arranged sequentially from top to bottom within the seedling frame 11, it is possible to cultivate one, two, and three batches of seedlings.

[0053] The controller is used to adjust the light intensity of the seedlings on the first layer of seedling trays after the seedling curtain is placed on the first and second layers of seedling trays distributed from top to bottom, so that the seedlings grow normally under white light (full spectrum) illumination: The controller controls the dynamic shading curtain and the supplemental lighting unit of the first layer of seedling trays so that the light intensity at the first layer of seedling trays is within the first light intensity range (1000-3000 lux). When the first layer of seedling trays needs supplemental lighting (i.e., the light intensity is lower than the lower limit of the first light intensity range, <1000 lux), the controller controls the dynamic shading curtain not to block the light and the supplemental lighting unit of the first layer of seedling trays to emit white light. When the light intensity is higher than the preset light intensity (e.g., light intensity >3000 lux), the controller controls the dynamic shading curtain to block the light.

[0054] The controller controls the flow control unit of the first-layer seedling tray to increase the water flow rate according to the cultivation time.

[0055] Specifically, in the early stage of seedling attachment (about 1-15 days after seedling collection), the seedlings are cultivated in still or slightly flowing water (1-2 cm / s) to avoid disturbance and mechanical damage to spore attachment and germination caused by water flow. During the seedling growth period (about 15 to 40 days after seedling collection), the water flow is controlled at 5-8 cm / s by the flow control unit to increase nutrient and gas exchange, remove metabolic waste, and promote seedling growth. During the strong seedling stage before leaving the warehouse (about 41 to 60 days after seedling collection), the water flow is increased to 10-15 cm / s to stimulate rapid seedling growth and enhance attachment.

[0056] The controller is used to extend the cultivation time of the second batch of seedlings on the second layer of seedling trays: The controller is used to cultivate the second crop of seedlings on the second-layer seedling tray by emitting white light within the second light intensity range (1000-2000 lux) through the supplementary lighting unit of the second-layer seedling tray in the early stage of seedling attachment, promoting the attachment and germination of zoospores to form gametophytes (about 10-15 days). After more than 80% of the gametophytes have formed under a microscope, the controller controls the supplementary lighting unit of the second-layer seedling tray to emit red and blue light within the third light intensity range (800-1200 lux), with the proportion of red light > the proportion of blue light. The red light is used to inhibit the development of gametophytes into sporophytes and delay the growth of the second crop of seedlings.

[0057] Of these, red light accounts for over 90%, while blue light accounts for less than 10%.

[0058] The controller is used to control the supplemental lighting unit of the second-layer seedling tray to supplement only red light when the light intensity is below the lower limit (800 lux) of the third light intensity range.

[0059] The controller controls the flow control unit of the second-layer seedling tray to carry out delayed cultivation with static or micro-flow water, maintain basic nutrient exchange and dissolved oxygen requirements, reduce physical disturbance, and reduce gamete metabolic consumption.

[0060] After the seedling trays are placed on the first and second seedling trays and the time is set, the seedling trays from the second harvest are placed on the third seedling tray for extended cultivation of the third batch of seedlings. The controller is used to emit white light within the second light intensity range (1000-2000 lux) through the supplementary lighting unit of the third seedling tray in the early stage of seedling attachment to promote the attachment and germination of zoospores to form gametophytes (about 10-15 days). After more than 80% of the gametophytes have formed under a microscope, the supplementary lighting unit of the third seedling tray is controlled to emit red light with a light intensity within the fourth light intensity range (800-1000 lux). Cultivation is carried out with red light of 800-1000 lux intensity, which inhibits the development of gametophytes into sporophytes and extends the seedling protection time.

[0061] When the light intensity is below the lower limit of the fourth light intensity range (800 lux), the controller controls the supplementary lighting unit of the third seedling tray to supplement only red light.

[0062] The controller controls the flow control unit of the third-layer seedling tray to carry out cultivation with static or micro-flow water, maintain basic nutrient exchange and dissolved oxygen requirements, reduce physical disturbance, and reduce gamete metabolic consumption.

[0063] Before the first batch of seedlings from the first-layer seedling trays is shipped out, at the first set time (approximately 10-15 days), the controller controls the supplemental lighting units of the second-layer seedling trays to reduce the proportion of red light and increase the proportion of blue light, while keeping the light intensity constant. At the second set time (approximately 5 days) before shipment, the controller controls the supplemental lighting units of the second-layer seedling trays to emit only blue light to cultivate the second batch of seedlings. Blue light is used to induce and promote the development of gametophytes into sporophytes, preparing for the transition to rapid cultivation. After the first batch of seedlings is shipped out, the second-layer seedling trays are raised to the first layer to form the first-layer seedling trays. The controller controls the dynamic shading curtain and the supplemental lighting units of the first-layer seedling trays to ensure that the light intensity at the first-layer seedling trays is within the first light intensity range (1000-3000 lux) for rapid cultivation. In the early stages, when the spore seedlings are tender (about 10 days before rapid cultivation), the flow control unit of the first layer of seedling trays controls the water flow rate within the first flow rate range (5-8 cm / s) to stimulate seedling growth and enhance adhesion. In the later stages of cultivation, the water flow rate is controlled within the second flow rate range (10-15 cm / s) to increase nutrient and gas exchange, remove metabolic waste, and accelerate the growth of the second batch of seedlings before they are released from storage.

[0064] The third batch of seedlings enters the second extended cultivation period. The third layer of seedling trays is raised to the second layer to form the second layer of seedling trays. The controller controls the third batch of seedlings to carry out the second extended cultivation period: the controller controls the supplementary lighting unit of the second layer of seedling trays to emit red and blue light within the third light intensity range (800-1200 lux), with the proportion of red light > the proportion of blue light. Among them, the proportion of red light exceeds 90%, and the proportion of blue light is less than 10%.

[0065] The controller controls the flow control unit of the second-layer seedling tray to carry out cultivation with static or micro-flow water, and performs secondary delayed seedling protection to ensure that the seedlings grow at different times than the second batch of seedlings.

[0066] Before the second batch of seedlings leaves the warehouse, at the first set time (approximately 10-15 days), the controller controls the supplemental lighting units of the second-layer seedling trays to reduce the proportion of red light and increase the proportion of blue light, while keeping the light intensity constant. At the second set time (approximately 5 days) before leaving the warehouse, the controller controls the supplemental lighting units of the second-layer seedling trays to emit only blue light to cultivate the third batch of seedlings. Blue light is used to induce and promote the development of gametophytes into sporophytes, preparing for the transition to rapid cultivation. After the second batch of seedlings leaves the warehouse, the third batch of seedlings is moved to the first layer, and the second-layer seedling trays are moved to the first layer to form the first-layer seedling trays. The controller controls the supplemental lighting units of the first-layer seedling trays to emit white light (1000-3000 lux) within the first light intensity range for rapid cultivation.

[0067] In the early stage of spore seedling growth (about 10 days before rapid cultivation), the controller controls the flow rate of the first layer of seedling trays to control the water flow rate within the first flow rate range (5-8 cm / s), stimulating seedling growth and enhancing adhesion. In the later stage of cultivation, the controller controls the water flow rate within the second flow rate range (10-15 cm / s), increasing nutrient and gas exchange, removing metabolic waste, and accelerating the growth of the third batch of seedlings before they are released from storage.

[0068] This embodiment also proposes a kelp seedling cultivation method based on a multi-layer vertical seedling device, wherein the multi-layer vertical seedling device includes a seedling frame 11, a seedling tray 12, a dynamic shading curtain 2, a supplementary lighting unit 3, a flow control unit 4, and an environmental monitoring unit 5.

[0069] When a first-layer seedling tray and a second-layer seedling tray are arranged sequentially from top to bottom within the seedling frame 11, it is possible to cultivate one-time seedlings and two-time seedlings.

[0070] The methods for cultivating kelp seedlings for the first and second crops are as follows: (1) Kelp seedling collection: In early August, the matured kelp seedlings were placed in a release pond to release zoospores. Seedling trays were then placed on the trays, and spore seedlings were collected and transferred to the trays. After the seedlings were collected, they were temporarily cultured in low-temperature running water until the second collection of seedlings. The culture conditions were: light intensity of 800-1000 lux and water temperature of 10-14℃.

[0071] The multi-layer vertical seedling device is fixed in the seedling pool, and the seedling curtain is placed on the first and second seedling trays distributed from top to bottom.

[0072] (2) Cultivation of a single batch of seedlings: Light adjustment is performed on the first batch of seedlings on the first layer of seedling trays to ensure normal growth under white light (full spectrum): The dynamic shading curtain and the supplemental lighting unit of the first layer of seedling trays are controlled to cultivate the first batch of seedlings under white light within the first light intensity range: The light at the first layer of seedling trays is kept within the first light intensity range (1000-3000 lux). When the first layer of seedling trays needs supplemental lighting (i.e., the light intensity is lower than the lower limit of the first light intensity range, <1000 lux), the dynamic shading curtain is controlled not to block light and the supplemental lighting unit of the first layer of seedling trays emits white light. When the light intensity is higher than the preset light intensity (e.g., light intensity >3000 lux), the dynamic shading curtain is controlled to block light.

[0073] The flow control unit of the first-layer seedling tray increases the water flow rate according to the cultivation time.

[0074] Specifically, in the early stage of seedling attachment (about 1-15 days after seedling collection), the seedlings are cultivated in still or slightly flowing water (1-2 cm / s) to avoid disturbance and mechanical damage to spore attachment and germination caused by water flow. During the seedling growth period (about 15 to 40 days after seedling collection), the water flow is controlled at 5-8 cm / s by the flow control unit to increase nutrient and gas exchange, remove metabolic waste, and promote seedling growth. During the strong seedling stage before leaving the warehouse (about 41 to 60 days after seedling collection), the water flow is increased to 10-15 cm / s to stimulate rapid seedling growth and enhance attachment.

[0075] (3) Cultivation of second-crop seedlings: Extended cultivation time was applied to the second batch of seedlings on the second layer of seedling trays: In the early stage of seedling attachment on the second-layer seedling tray, white light within the second light intensity range (1000-2000 lux) is emitted by the supplementary lighting unit of the second-layer seedling tray to promote the attachment and germination of zoospores to form gametophytes (about 10-15 days). After more than 80% of the gametophytes have formed under a microscope, the supplementary lighting unit of the second-layer seedling tray is controlled to emit red and blue light within the third light intensity range (800-1200 lux), with the proportion of red light > the proportion of blue light. The red light is used to inhibit the development of gametophytes into sporophytes and delay the growth of the second crop of seedlings.

[0076] Of these, red light accounts for over 90%, while blue light accounts for less than 10%.

[0077] When the light intensity is below the lower limit of the third light intensity range (800 lux), the supplemental lighting unit of the second-layer seedling tray is controlled to supplement only red light.

[0078] The second-layer seedling tray is controlled by a flow control unit with static or micro-flow water for extended cultivation, maintaining basic nutrient exchange and dissolved oxygen requirements, reducing physical disturbance, and lowering gamete metabolic consumption.

[0079] (4) First crop seedlings leaving the warehouse and second crop seedlings being adjusted: Before the first batch of seedlings on the first-layer seedling tray is shipped out, at the first set time (10-15 days), the supplementary lighting unit of the second-layer seedling tray is controlled to reduce the proportion of red light and increase the proportion of blue light, while keeping the light intensity unchanged. At the second set time (5 days) before shipping out, the supplementary lighting unit of the second-layer seedling tray is controlled to emit only blue light to cultivate the second batch of seedlings. Blue light is used to induce and promote the development of gametophytes into sporophytes, preparing for the transition to rapid cultivation.

[0080] (5) Second crop seedling cultivation and delivery: After the first batch of seedlings is removed from the warehouse, the second layer of seedling trays is raised to the first layer to form the first layer of seedling trays. The dynamic shading curtain and the supplemental lighting unit of the first layer of seedling trays are controlled so that the light at the first layer of seedling trays is within the first light intensity range (1000-3000 lux) for rapid cultivation.

[0081] In the early stage of spore seedling growth (about 10 days before rapid cultivation), the flow control unit of the first layer of seedling trays controls the water flow rate within the first flow rate range (5-8 cm / s) to stimulate seedling growth and enhance adhesion. In the later stage of cultivation, the water flow rate is controlled within the second flow rate range (10-15 cm / s) to increase nutrient and gas exchange, remove metabolic waste, and accelerate the growth of the second batch of seedlings before they are released from storage.

[0082] When the first, second, and third seedling trays are arranged sequentially from top to bottom within the seedling frame 11, it is possible to cultivate one, two, and three batches of seedlings.

[0083] The methods for cultivating kelp seedlings in the first, second, and third batches are as follows: (1) Kelp seedling collection: In early August, the matured kelp seedlings were placed in a release pond to release zoospores. Seedling trays were then placed on the trays, and spore seedlings were collected and transferred to the trays. After the seedlings were collected, they were temporarily cultured in low-temperature running water until the second collection of seedlings. The culture conditions were: light intensity of 800-1000 lux and water temperature of 10-14℃.

[0084] The multi-layer vertical seedling device is fixed in the seedling pool, and the seedling curtain is placed on the first and second seedling trays distributed from top to bottom.

[0085] (2) Cultivation of a single batch of seedlings: Light adjustment is performed on the first batch of seedlings on the first layer of seedling trays to ensure normal growth under white light (full spectrum): The dynamic shading curtain and the supplemental lighting unit of the first layer of seedling trays are controlled to provide normal white light cultivation for the first batch of seedlings on the first layer of seedling trays: The light at the first layer of seedling trays is within the first light intensity range (1000-3000 lux). When the first layer of seedling trays needs supplemental lighting (i.e., the light intensity is lower than the lower limit of the first light intensity range, <1000 lux), the dynamic shading curtain is controlled not to block light, and the supplemental lighting unit of the first layer of seedling trays emits white light. When the light intensity is higher than the preset light intensity (e.g., light intensity >3000 lux), the dynamic shading curtain is controlled to block light.

[0086] The flow control unit of the first-layer seedling tray increases the water flow rate according to the cultivation time.

[0087] Specifically, in the early stage of seedling attachment (about 1-15 days after seedling collection), the seedlings are cultivated in still or slightly flowing water (1-2 cm / s) to avoid disturbance and mechanical damage to spore attachment and germination caused by water flow. During the seedling growth period (about 15 to 40 days after seedling collection), the water flow is controlled at 5-8 cm / s by the flow control unit to increase nutrient and gas exchange, remove metabolic waste, and promote seedling growth. During the strong seedling stage before leaving the warehouse (about 41 to 60 days after seedling collection), the water flow is increased to 10-15 cm / s to stimulate rapid seedling growth and enhance attachment.

[0088] (3) Cultivation of second-crop seedlings: Extended cultivation time was applied to the second batch of seedlings on the second layer of seedling trays: In the early stage of seedling attachment on the second-layer seedling tray, white light within the second light intensity range (1000-2000 lux) is emitted by the supplementary lighting unit of the second-layer seedling tray to promote the attachment and germination of zoospores to form gametophytes (about 10-15 days). After more than 80% of the gametophytes have formed under a microscope, the supplementary lighting unit of the second-layer seedling tray is controlled to emit red and blue light within the third light intensity range (800-1200 lux), with the proportion of red light > the proportion of blue light. The red light is used to inhibit the development of gametophytes into sporophytes and delay the growth of the second crop of seedlings.

[0089] Of these, red light accounts for over 90%, while blue light accounts for less than 10%.

[0090] When the light intensity is below the lower limit of the third light intensity range (800 lux), the supplemental lighting unit of the second-layer seedling tray is controlled to supplement only red light.

[0091] The second-layer seedling tray is controlled by a flow control unit with static or micro-flow water for extended cultivation, maintaining basic nutrient exchange and dissolved oxygen requirements, reducing physical disturbance, and lowering gamete metabolic consumption.

[0092] (4) Second collection of seedlings: In early September, the temporarily cultured kelp seedlings were placed in a release pond. Through shade drying and low-temperature stimulation, the seedlings released a large number of zoospores. Seedling curtains were then placed in the pond for a second seedling collection. The low-temperature shade drying time was 2-3 hours at a temperature of 7-10℃. After shade drying, the seedlings were placed in seawater at 7-10℃ for seedling collection.

[0093] (5) Cultivation of three batches of seedlings: The seedling trays from the second harvest are placed on the third-layer seedling tray for extended cultivation of the third batch of seedlings: In the early stage of seedling attachment on the third-layer seedling tray, white light within the second light intensity range (1000-2000 lux) is emitted by the supplementary lighting unit of the third-layer seedling tray to promote the attachment and germination of zoospores to form gametophytes (about 10-15 days). After more than 80% of the gametophytes have formed under a microscope, the supplementary lighting unit of the third-layer seedling tray is controlled to emit red light, with the light intensity within the fourth light intensity range (800-1000 lux). The red light is used to inhibit the development of gametophytes into sporophytes, thus extending the seedling cultivation period.

[0094] When the light intensity is below the lower limit of the fourth light intensity range (800 lux), the supplemental lighting unit of the third seedling tray is controlled to supplement only red light.

[0095] The third-layer seedling tray uses a controlled-flow unit with static or micro-flow water to maintain basic nutrient exchange and dissolved oxygen requirements, reducing physical disturbance and lowering gamete metabolic consumption.

[0096] (6) First-crop seedlings leaving the warehouse and adjustments for the second and third crops: From early to mid-October, seedlings will be released from storage when they grow to more than 1mm.

[0097] Before the first batch of seedlings from the first-layer seedling trays is shipped out, at the first set time (about 10-15 days), the supplemental lighting units of the second-layer seedling trays are controlled to reduce the proportion of red light and increase the proportion of blue light, while keeping the light intensity unchanged. At the second set time (about 5 days) before shipping out, the supplemental lighting units of the second-layer seedling trays are controlled to emit only blue light to cultivate the second batch of seedlings. Blue light is used to induce and promote the development of gametophytes into sporophytes, preparing for the transition to rapid cultivation.

[0098] After the first batch of seedlings is removed from the warehouse, the second layer of seedling trays is raised to the first layer to form the first layer of seedling trays. The dynamic shading curtain and the supplemental lighting unit of the first layer of seedling trays are controlled so that the light at the first layer of seedling trays is within the first light intensity range (1000-3000 lux) for rapid cultivation.

[0099] In the early stage of spore seedling growth (about 10 days before rapid cultivation), the flow control unit of the first layer of seedling trays controls the water flow rate within the first flow rate range (5-8 cm / s) to stimulate seedling growth and enhance adhesion. In the later stage of cultivation, the water flow rate is controlled within the second flow rate range (10-15 cm / s) to increase nutrient and gas exchange, remove metabolic waste, and accelerate the growth of the second batch of seedlings before they are released from storage.

[0100] The third seedling tray is raised to the second layer to form the second seedling tray. The third batch of seedlings is controlled to carry out a second delayed cultivation. The supplementary lighting unit of the second seedling tray emits red and blue light within the third light intensity range (800-1200 lux), with the proportion of red light > the proportion of blue light. Among them, the proportion of red light exceeds 90% and the proportion of blue light is less than 10%.

[0101] The second-layer seedling tray is controlled by a flow control unit that uses static or micro-flow water for cultivation, and a second delay in seedling protection is carried out to ensure that the seedlings grow at different times than the second batch of seedlings.

[0102] (7) Second crop seedlings leaving the warehouse and rapid cultivation of the third crop seedlings: From early to mid-November, the second batch of seedlings will be shipped out when they grow to more than 1mm.

[0103] Before the second batch of seedlings leaves the warehouse, at the first set time (approximately 10-15 days), the supplemental lighting units of the second-layer seedling trays are controlled to reduce the proportion of red light and increase the proportion of blue light, while keeping the light intensity constant. At the second set time (approximately 5 days) before leaving the warehouse, the supplemental lighting units of the second-layer seedling trays are controlled to emit only blue light to cultivate the third batch of seedlings. Blue light is used to induce and promote the development of gametophytes into sporophytes, preparing for the transition to rapid cultivation. After the second batch of seedlings leaves the warehouse, the third batch of seedlings is moved to the first layer, and the second-layer seedling trays are moved to the first layer to form the first-layer seedling trays. The supplemental lighting units of the first-layer seedling trays are controlled to emit white light within the first light intensity range (1000-3000 lux) for rapid cultivation.

[0104] In the early stage of spore seedling growth (about 10 days before rapid cultivation), the flow control unit of the first layer of seedling trays controls the water flow rate within the first flow rate range (5-8 cm / s) to stimulate seedling growth and enhance adhesion. In the later stage of cultivation, the water flow rate is controlled within the second flow rate range (10-15 cm / s) to increase nutrient and gas exchange, remove metabolic waste, and accelerate the growth of the third batch of seedlings before they are released from storage.

[0105] (8) Third batch of seedlings shipped out: From late November to early December, the seedlings will be shipped out when they grow to more than 1 mm.

[0106] Wherein, the lower limit of the third light intensity range = the lower limit of the fourth light intensity range < the upper limit of the fourth light intensity range < the upper limit of the third light intensity range < the upper limit of the second light intensity range < the upper limit of the first light intensity range.

[0107] The first light intensity range is 1000-3000 lux, the second light intensity range is 1000-2000 lux, the third light intensity range is 800-1200 lux, and the fourth light intensity range is 800-1000 lux.

[0108] The first light intensity range is the light intensity range for normal seedling cultivation and rapid cultivation under white light.

[0109] The second light intensity range is the range of light intensity range for white light to promote the attachment and germination of zoospores to form gametophytes.

[0110] The third light intensity range is the light intensity range for extended cultivation of second-crop seedlings.

[0111] The fourth light intensity range is the light intensity range for the extended cultivation of three crop seedlings.

[0112] This application includes the following key innovations: 1. The method for controlling delayed cultivation is to adjust the spectral ratio rather than simply using weak light. Red light inhibits reproduction and slows growth, while blue light promotes reproduction and accelerates growth. During the delayed cultivation stage, red light is used, with light intensity reaching 800-1200 lux, significantly higher than the 300-800 lux of traditional weak light suppression, ensuring healthy seedlings. In the transition period before rapid cultivation, blue light is used to induce rapid development of gametophytes into sporophytes. During the rapid cultivation stage, white light is used for conventional cultivation, allowing sporophytes to grow rapidly to meet the standards for release.

[0113] 2. Extending to the cultivation of three seedlings, a dual regulation of secondary seedling harvesting and delayed seedling protection is used to create a time difference for the cultivation of three seedlings. After the first harvest of seedlings from the same batch of vegetables, they are not discarded but are temporarily placed in low-temperature running water to preserve their reproductive potential. After about 30 days, through shade drying and low-temperature stimulation, zoospores are induced to be released, and a second harvest of seedlings is carried out to provide independent, sufficient, and timely spore seedlings for the cultivation of three seedlings. The three seedlings are protected twice with red light and 90% red light respectively to delay their growth, so that they grow at different times than the second seedlings and are cultivated in a relay.

[0114] 3. A multi-crop seedling growth rhythm regulation method that coordinates spectrum, light intensity, and water flow, scientifically implementing "control first, then promote". The first extended cultivation of the third crop (lower layer of the seedling rack) is conducted under full red light, with a light intensity of 800-1000 lux, and still or slightly flowing water. The second extended cultivation of the third crop and the second crop (middle layer of the seedling rack) are conducted under red light >90%, with a light intensity of 800-1200 lux, and still or slightly flowing water. During the transition period before rapid cultivation, the light gradually transitions to full blue light, with a light intensity of 800-1200 lux, and still or slightly flowing water. Rapid cultivation (upper layer of the seedling rack) is conducted under white light, with a light intensity of 1000-3000 lux and a water flow of 10-15 cm / s. Through the relay transfer of different crop positions on multiple layers of the seedling rack and the gradual transition of cultivation conditions, continuous production of multiple crop seedlings is achieved.

[0115] This embodiment has the following beneficial effects: (1) It fundamentally solves the problem of insufficient light for the lower layer of seedlings and improves the quality of seedlings: Each layer of seedling tray is equipped with an LED supplementary light unit with adjustable spectrum. During the delayed cultivation stage, the seedlings are cultivated with red light of medium intensity to slow down growth, while ensuring the accumulation of photosynthetic products, increasing the chlorophyll content of seedlings, enhancing adhesion, reducing diseases and seedling rot, and improving the stability and delivery rate of seedlings.

[0116] (2) Achieve efficient cultivation of three batches of seedlings and increase production capacity per unit water body: The dual regulation of secondary seedling collection and extended seedling protection expands the second batch of seedlings to the third batch within the seedling cultivation cycle, realizing batch cultivation of kelp seedlings, breaking the traditional "one-to-two" limitation, and increasing the seedling output per unit water body by 50%.

[0117] (3) Synergistic regulation of spectrum, light intensity, and water flow, resulting in flexible and controllable process: Traditional methods rely solely on light intensity regulation, which cannot simultaneously meet the contradictory requirements of "delaying growth" and "ensuring robust growth". This embodiment uses a synergistic multi-seedling growth rhythm regulation method based on spectrum, light intensity, and water flow to scientifically "control first and then promote", achieving refined and differentiated regulation of kelp seedlings at different layers and different seedling batches. This method is flexible, controllable, and easy to operate, reducing production risks caused by environmental fluctuations and achieving stable, controllable, and highly efficient synergistic cultivation of multiple seedlings.

[0118] (4) Reduce cultivation costs and improve economic benefits: Multi-layer layout and multi-crop relay production enable the energy consumption, labor, and raw material costs of kelp seedling cultivation to be effectively distributed among 2-3 seedlings. At the same time, the expansion of multi-crop seedling cultivation can continuously provide high-quality seedlings to the market from November to December, fill the market gap, improve economic benefits, and have good market application prospects.

[0119] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions claimed by the present invention.

Claims

1. A multi-layer vertical seedling raising device for kelp, comprising a seedling frame and several layers of seedling trays located within the seedling frame, wherein the seedling trays are used to hold seedling curtains; characterized in that, The height of the seedling tray within the seedling frame is adjustable, and the vertical seedling device includes: A dynamic shading curtain is located at the top of the seedling frame; Supplemental lighting unit, each layer of the seedling tray is equipped with the supplemental lighting unit; A flow control unit is installed on each layer of the seedling tray, and the flow control unit is used to regulate the water flow rate. An environmental monitoring unit is installed on each layer of the seedling tray. The environmental monitoring unit is used to monitor light intensity and send the data to the controller. After the seedling curtain is placed on the first and second seedling trays distributed from top to bottom, the controller is used to control the dynamic shading curtain and the supplemental lighting unit of the first seedling tray to cultivate the seedlings of the first seedling tray under white light within the first light intensity range; and to control the flow control unit of the first seedling tray to increase the water flow rate according to the cultivation time. The controller is used for extended cultivation of the second batch of seedlings on the second-layer seedling tray: In the early stages of seedling attachment on the second-layer seedling tray, the controller uses the supplemental lighting unit of the second-layer seedling tray to emit white light within a second light intensity range to promote the attachment and germination of zoospores to form gametophytes. Subsequently, the controller controls the supplemental lighting unit of the second-layer seedling tray to emit red and blue light within a third light intensity range, where the proportion of red light is greater than the proportion of blue light. When the light intensity is lower than the lower limit of the third light intensity range, the controller controls the supplemental lighting unit of the second-layer seedling tray to supplement only red light. The controller also controls the flow control unit of the second-layer seedling tray to use static or micro-flow water for cultivation. Before the first batch of seedlings on the first-layer seedling tray is removed from storage, at a first set time, the controller controls the supplemental lighting unit of the second-layer seedling tray to reduce the proportion of red light and increase the proportion of blue light. Before the second set time, the controller controls the supplemental lighting unit of the second-layer seedling tray to emit only blue light to cultivate the second batch of seedlings. After the first batch of seedlings is removed from storage, the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The controller controls the dynamic shading curtain and the supplemental lighting unit of the first-layer seedling tray so that the light at the first-layer seedling tray is within a first light intensity range. The controller controls the flow control unit of the first-layer seedling tray to control the water flow rate within a first flow rate range. In the later stage of cultivation, the water flow rate is controlled within a second flow rate range until the second batch of seedlings is removed from storage.

2. The kelp multi-layer vertical seeding device according to claim 1, characterized in that, A third seedling tray is installed below the second seedling tray. After the seedling curtain is placed on the first and second seedling trays for a set time, the seedling curtain with second-harvested seedlings is placed on the third seedling tray for extended cultivation of the third batch of seedlings. The controller is used to cultivate seedlings in the early stage of seedling attachment on the third seedling tray by emitting white light within the second light intensity range through the supplementary lighting unit of the third seedling tray to promote the attachment and germination of zoospores to form gametophytes. Afterward, the controller controls the supplementary lighting unit of the third seedling tray to emit red light, with the light intensity within the fourth light intensity range. When the light intensity is lower than the lower limit of the fourth light intensity range, the controller controls the supplementary lighting unit of the third seedling tray to supplement only red light. The controller also controls the flow control unit of the third seedling tray to cultivate seedlings in still or slightly flowing water. After the first batch of seedlings is taken out of the warehouse, the third layer of seedling trays is raised to the second layer to form the second layer of seedling trays. The controller controls the third batch of seedlings to undergo a second delayed cultivation: the controller controls the supplementary lighting unit of the second layer of seedling trays to emit red and blue light within the third light intensity range, wherein the proportion of red light is greater than the proportion of blue light, and controls the flow control unit of the second layer of seedling trays to carry out cultivation in still water or micro-flow water. Before the second batch of seedlings is removed from storage, at a first set time, the controller controls the supplemental lighting unit of the second-layer seedling tray to reduce the proportion of red light and increase the proportion of blue light. At a second set time before removal from storage, the controller controls the supplemental lighting unit of the second-layer seedling tray to emit only blue light to cultivate the third batch of seedlings. After the second batch of seedlings is removed from storage, the third batch of seedlings is raised to the first layer, and the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The controller controls the supplemental lighting unit of the first-layer seedling tray to emit white light within a first light intensity range for cultivation. The controller controls the flow control unit of the first-layer seedling tray to control the water flow rate within a first flow rate range. In the later stage of cultivation, the water flow rate is controlled within a second flow rate range until the third batch of seedlings is removed from storage.

3. The kelp multi-layer vertical seeding device according to claim 1 or 2, characterized in that, When the controller controls the supplementary light unit to emit red and blue light, the proportion of red light exceeds 90% and the proportion of blue light is less than 10%.

4. The kelp multi-layer vertical seeding device according to claim 1 or 2, characterized in that, After more than 80% of the zoospores have formed gametophytes, the controller controls the supplementary lighting unit to emit red and blue light.

5. The kelp multi-layer vertical seeding device according to claim 1 or 2, characterized in that, The supplemental lighting units are arranged in an S-shape on the seedling tray, the airflow control unit is located on the two short sides of the seedling tray, and the environmental monitoring unit is located on the long side of the seedling tray.

6. The kelp multi-layer vertical seeding device according to claim 1 or 2, characterized in that, The environmental monitoring unit is used to monitor the water flow rate and send the data to the controller.

7. A method for cultivating kelp seedlings based on a multi-layer vertical seeding device, wherein the multi-layer vertical seeding device comprises: Seedling frame; Several layers of seedling trays are located within the seedling frame. The seedling trays are used to hold seedling curtains, and the height of the seedling trays within the seedling frame is adjustable. A dynamic shading curtain, located at the top of the seedling frame, adjusts the light intensity of the seedling tray; Supplemental lighting unit, each layer of the seedling tray is equipped with the supplemental lighting unit; A flow control unit is installed on each layer of the seedling tray, and the flow control unit is used to regulate the water flow rate. An environmental monitoring unit is installed on each layer of the seedling tray, and the environmental monitoring unit is used to monitor light intensity at least. The method for cultivating kelp seedlings is characterized by: The seedling tray is placed on the first and second seedling trays distributed from top to bottom. The dynamic shading curtain and the supplemental lighting unit of the first seedling tray are controlled to cultivate the seedlings of the first seedling tray under white light within the first light intensity range. The flow control unit of the first seedling tray is controlled to increase the water flow rate according to the cultivation time. Extended cultivation is carried out on the second batch of seedlings on the second-layer seedling tray: In the early stage of seedling attachment on the second-layer seedling tray, white light within the second light intensity range is emitted by the supplemental lighting unit of the second-layer seedling tray to promote the attachment and germination of zoospores to form gametophytes. Then, the supplemental lighting unit of the second-layer seedling tray is controlled to emit red and blue light within the third light intensity range, wherein the proportion of red light is greater than the proportion of blue light. When the light intensity is lower than the lower limit of the third light intensity range, the supplemental lighting unit of the second-layer seedling tray is controlled to supplement only red light; the flow control unit of the second-layer seedling tray is controlled to carry out cultivation in still water or micro-flow water. Before the first batch of seedlings on the first-layer seedling tray is removed from storage, at a first set time, the supplemental lighting unit of the second-layer seedling tray is controlled to reduce the proportion of red light and increase the proportion of blue light. Before the second set time, the supplemental lighting unit of the second-layer seedling tray is controlled to emit only blue light to cultivate the second batch of seedlings. After the first batch of seedlings is removed from storage, the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The dynamic shading curtain and the supplemental lighting unit of the first-layer seedling tray are controlled so that the light at the first-layer seedling tray is within the first light intensity range. The flow control unit of the first-layer seedling tray is controlled to control the water flow rate within the first flow rate range. In the later stage of cultivation, the water flow rate is controlled within the second flow rate range until the second batch of seedlings is removed from storage.

8. The kelp seedling cultivation method according to claim 7, characterized in that, A third seedling tray is installed below the second seedling tray. After the seedling curtain is placed on the first and second seedling trays for a set time, the seedling curtain with second-harvested seedlings is placed on the third seedling tray for extended cultivation of the third batch of seedlings. In the early stage of seedling attachment on the third seedling tray, white light within the second light intensity range is emitted by the supplemental lighting unit of the third seedling tray to promote the attachment and germination of zoospores to form gametophytes. Then, the supplemental lighting unit of the third seedling tray is controlled to emit red light, with the light intensity within the fourth light intensity range. When the light intensity is lower than the lower limit of the fourth light intensity range, the supplemental lighting unit of the third seedling tray is controlled to supplement only red light. The flow control unit of the third seedling tray is controlled to carry out cultivation with still water or micro-flow water. After the first batch of seedlings is taken out of the warehouse, the third layer of seedling trays is raised to the second layer to form the second layer of seedling trays. The third batch of seedlings is controlled to undergo a second delayed cultivation: the supplementary lighting unit of the second layer of seedling trays is controlled to emit red and blue light within the third light intensity range, wherein the proportion of red light is greater than the proportion of blue light. The flow control unit of the second layer of seedling trays is controlled to carry out cultivation in still water or micro-flow water. Before the second batch of seedlings is removed from storage, at a first set time, the supplemental lighting unit of the second-layer seedling tray is controlled to reduce the proportion of red light and increase the proportion of blue light. At a second set time before removal from storage, the supplemental lighting unit of the second-layer seedling tray is controlled to emit only blue light to cultivate the third batch of seedlings. After the second batch of seedlings is removed from storage, the third batch of seedlings is raised to the first layer, and the second-layer seedling tray is raised to the first layer to form the first-layer seedling tray. The supplemental lighting unit of the first-layer seedling tray is controlled to emit white light within a first light intensity range for cultivation. The flow control unit of the first-layer seedling tray is controlled to control the water flow rate within a first flow rate range. In the later stage of cultivation, the water flow rate is controlled within a second flow rate range until the third batch of seedlings is removed from storage.

9. The kelp seedling cultivation method according to claim 7 or 8, characterized in that, When the supplementary lighting unit is controlled to emit red and blue light, the proportion of red light exceeds 90% and the proportion of blue light is less than 10%.

10. The kelp seedling cultivation method according to claim 7 or 8, characterized in that, After more than 80% of the zoospores have formed gametophytes, the supplementary lighting unit is controlled to emit red and blue light.

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