Hydroponic floating tray seedling raising device for dynamic circulation and accurate distribution of nutrient solution

Abstract

The invention belongs to the technical field of seedling raising equipment, and particularly relates to a hydroponic floating tray seedling raising device for dynamic circulation and accurate distribution of nutrient solution, which comprises a tray and a seedling tray placed on the tray, integrally-formed seedling holes are arrayed in the seedling tray, a water absorption hole is formed in the center of the bottom of each seedling hole, a side edge groove is integrally formed in the side wall of each seedling hole, water absorption cotton strips for absorbing nutrient solution and water are embedded in the side edge grooves, and side absorption holes for diffusing the nutrient solution and the water to seedlings are uniformly formed in the side edge grooves; water permeable holes are formed in the bottom of the tray and are perpendicular to and opposite to the water absorption holes, convex blocks are arranged on the inner bottom wall of the tray in a protruding mode, gaps used for liquid flowing are formed between the adjacent convex blocks, and convex points used for supporting the seedling holes are further evenly arranged on the convex blocks in a protruding mode to form supporting gaps so that the liquid can flow circularly. According to the seedling tray, seedling roots cannot be inserted into the seedling tray, a nutrient solution and water are reserved, meanwhile, the nutrient solution and the water can circularly flow, accurate allocation is achieved, and the normal growth requirement of seedlings is met.

Description

Technical Field

[0001] The invention belongs to the technical field of seedling raising equipment, and in particular relates to a hydroponic floating tray seedling raising device with dynamic circulation and precise distribution of nutrient solution. Background Art

[0002] The hydroponic floating tray is an important tool for soilless seedling cultivation. It combines floating seedling technology and floats the seedling tray in the nutrient solution pool to achieve efficient seed cultivation. It is usually used in greenhouses, seedling factories, home gardening and other scenarios; it is used to grow seedlings of vegetables, flowers, tobacco, Chinese medicinal materials and other plants.

[0003] Traditional hydroponic floating trays are generally supported by opening seedling holes on plastic foam, but this structure will cause the roots to be restricted by limited hole space in the later stages of seedling cultivation, causing the roots to penetrate into the gaps between the foam plastic particles, damaging the roots when the seedlings are removed. It is also difficult to clean after secondary use and is prone to breeding bacteria.

[0004] Secondly, the nutrient solution and water do not flow smoothly at the bottom of the root system, which is not conducive to the circulation and precise distribution of the nutrient solution and water, which can easily cause malnutrition of some seedlings and is not conducive to large-scale seedling cultivation. Summary of the invention

[0005] The purpose of the present invention is to provide a hydroponic floating tray seedling raising device with dynamic circulation and precise distribution of nutrient solution, which can prevent the roots of the seedlings from penetrating into the seedling tray. At the same time, a flow gap is set between the seedling tray and the tray, so that the nutrient solution and water can circulate while being retained, thereby achieving precise distribution and ensuring the normal growth needs of the seedlings.

[0006] The technical solution adopted by the present invention is as follows: A hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution, comprising a tray and a seedling tray placed on the tray; The seedling tray is arrayed with an integrally formed seedling hole, and a water absorption hole is opened at the bottom center of each seedling hole, the side wall of the seedling hole is integrally formed with a side groove, and a cotton strip for absorbing nutrient solution and water is embedded in the side groove, and side absorption holes for diffusing nutrient solution and water to the seedlings are evenly opened on the side groove; A water-permeable hole is provided at the bottom of the tray perpendicular to the water absorption hole, and a bump is raised on the inner bottom wall of the tray, and a gap for liquid flow is formed between adjacent bumps. The bumps are also uniformly raised with bumps for supporting the seedling holes to form a supporting gap to allow liquid to circulate.

[0007] As a preferred solution, the edge of the seedling tray is integrally formed with a supporting side skirt for supporting the top surface of the tray, and ventilation grooves are evenly opened on the supporting surface of the tray to form an air flow channel between the supporting side skirt and the top surface of the tray.

[0008] As a preferred solution, the seedling hole is in a trapezoidal shape, and the inner diameter gradually increases from the bottom to the top. The depth of the seedling hole ranges from 5mm to 200mm, and the depth of the tray changes adaptively relative to the depth to support it.

[0009] As a preferred embodiment, the side groove extends from the side wall of the seedling hole to its bottom and is connected with the water absorption hole to form a liquid flow channel. The absorbent cotton strip is embedded in the side wall of the side groove and extends to the bottom of the seedling hole.

[0010] As a preferred solution, the four corners of the inner wall of the tray are integrally formed with limiting protrusions, and the limiting protrusions are fitted with the side walls of the seedling holes located at the four corners to limit the position of the seedling tray.

[0011] As a preferred solution, it further comprises activated carbon, and the bottom surface of the tray is provided with flow grooves adapted to the water-permeable holes, and a positioning groove for installing the activated carbon is provided corresponding to each of the water-permeable holes.

[0012] As a preferred solution, the positioning groove is in the shape of a regular polygon or a circle, and the activated carbon is in the shape of a polygon or a circle to match it. The side wall of the positioning groove is provided with side strip holes to facilitate the flow of liquid.

[0013] As a preferred solution, an observation pillar is integrally formed at the bottom of the seedling tray at the diagonal of the seedling hole, and scale lines are provided on the inner wall of the observation pillar. A mounting hole for connecting the observation pillar is opened on the tray, and the observation pillar extends through the mounting hole to its bottom to display the draft depth.

[0014] As a preferred solution, it further comprises a floating bar, and a mounting groove for mounting the floating bar is provided on the bottom surface of the tray, so that the floating bar can be mounted on the bottom of the tray to change its immersion depth in the water.

[0015] As a preferred solution, the seedling tray is integrally injection-molded from polystyrene, polyvinyl chloride, polypropylene or a degradable plastic, and the tray is made of one of the foam plastics so as to float on the water surface to support the seedling tray.

[0016] The technical effects achieved by the present invention are: The present invention arranges a split seedling tray and a tray, and uses a plastic material to prepare the seedling tray, so that the seedling roots cannot penetrate the inner wall thereof, thereby preventing the seedling roots from penetrating into the seedling tray. At the same time, the trapezoidal structure of the seedling hole makes it easier to take out the seedlings without damaging the roots. At the same time, it is convenient to clean and reuse, and will not easily breed bacteria. At the same time, the tray is made of foam material, which can provide stable support for it.

[0017] The present invention provides side grooves, and embeds absorbent cotton strips for absorbing nutrient solution and water therein. Side suction holes for diffusing nutrient solution and water to seedlings are evenly opened on the side grooves. In this way, during the cultivation process, the nutrient solution and water can be lifted upward by the absorbent cotton strips and diffused into the matrix through the side suction holes to avoid insufficient nutrition for the growth of seedlings. The nutrient solution is absorbed and stored in the absorbent cotton strips to avoid the nutrient solution being lost with the water flow, thereby ensuring accurate distribution of the nutrient solution.

[0018] The present invention can ensure that nutrient solution and water fully flow around the water permeable holes by arranging the flow grooves, reduce the arc surface tension of the liquid in contact with the water permeable holes and the water surface, so that the liquid can fully flow into the water permeable holes, thereby ensuring that the seedlings can obtain sufficient nutrient solution and water. At the same time, activated carbon is installed inside corresponding to the water permeable holes to adsorb impurities, pathogens and other substances in the nutrient solution and water to avoid root rot or...

[0019] The present invention arranges an observation pillar and sets scale lines on the inner wall thereof. It can utilize the principle of communicating vessels to accurately observe the draft of seedlings, judge whether the draft meets the standard, and avoid excessive draft or shallow draft, which affects the growth of seedlings. At the same time, floating bars are arranged, and the buoyancy of the whole device can be changed by increasing or decreasing the floating bars, thereby changing the draft. The scale lines in the observation pillars can be used to observe whether the requirements are met, thereby ensuring that the seedlings are in a good planting environment, avoiding root rot due to excessive water or drying up due to insufficient water, and improving the survival rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention; Figure 2 is an exploded view of an embodiment of the present invention; Figure 3 The present invention Figure 2 A magnified view of the part in the middle; Figure 4 is a top view of an embodiment of the present invention; Figure 5 The present invention Figure 4 Cross-sectional view of the middle AA section; Figure 6 The present invention Figure 4Cross-sectional view of the middle BB section; Figure 7 It is a structural schematic diagram of a seedling tray in an embodiment of the present invention; Figure 8 The present invention Figure 7 A magnified view of the part in middle B; Fig. 9 is a schematic structural diagram of a tray in an embodiment of the present invention; Fig.10 is a schematic diagram of the bottom structure of a tray in an embodiment of the present invention; Fig.11 Schematic diagram of the combined structure of the bottom surface of the tray in an embodiment of the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Seedling tray; 11. Seedling hole; 12. Water absorption hole; 13. Side groove; 14. Water absorption cotton strip; 15. Side absorption hole; 16. Observation pillar; 17. Support side skirt; 2. Pallet; 21. Water-permeable hole; 22. Bump; 23. Bump; 24. Position-limiting protrusion; 25. Ventilation groove; 26. Flow groove; 27. Mounting groove; 28. Mounting hole; 29. ​​Positioning groove; 210. Edge strip hole; 3. Activated carbon; 4. Floating strips. DETAILED DESCRIPTION

[0022] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0023] like Figure 1-Figure 11 As shown, a hydroponic floating tray seedling raising device with dynamic circulation and precise distribution of nutrient solution comprises a tray 2 and a seedling tray 1 placed on the tray 2. The tray 2 floats on the water surface to support the seedling tray 1, and the seedlings are planted on the seedling tray 1 using a substrate, thereby realizing floating hydroponics of the seedlings. At the same time, the separated structure is helpful for the planting of seedlings and the later removal of seedlings.

[0024] Refer to the attached Figure 2-Figure 3 as well as Figure 7-Figure 8The seedling tray 1 is arrayed with an integrated seedling hole 11, and a water absorption hole 12 is provided at the bottom center of each seedling hole 11. By filling the seedling hole 11 with a matrix, the seedling can be planted, and the water absorption hole 12 at the bottom can replenish the nutrient solution and water required for plant growth. At the same time, the side wall of the seedling hole 11 is integrally formed with a side groove 13, and a water absorption cotton strip 14 for absorbing nutrient solution and water is embedded inside the side groove 13. The side groove 13 is evenly provided with side absorption holes 15 for diffusing nutrient solution and water to the seedlings. In this way, during the cultivation process, the nutrient solution and water can be lifted upward by the water absorption cotton strip 14, and diffused into the matrix through the side absorption holes 15 to avoid the occurrence of insufficient nutrition for the growth of the seedlings, and the nutrient solution is absorbed and stored in the water absorption cotton strip 14 to avoid the nutrient solution from being lost with the water flow, thereby ensuring the accurate distribution of the nutrient solution.

[0025] Refer to the attached Figure 2 as well as Fig. 9 A water-permeable hole 21 is provided at the bottom of the tray 2 perpendicularly opposite to the water-absorbing hole 12, and a convex block 22 is raised on the inner bottom wall of the tray 2. At the same time, convex points 23 for supporting the seedling hole 11 are evenly raised on the convex block 22. In this way, when the seedling hole 11 is placed inside the tray 2, the water-permeable hole 21 can be aligned with the water-absorbing hole 12 to ensure the supply of nutrient solution and water. At the same time, adjacent raised convex blocks 22 are used to form a gap for liquid flow between them, so that the nutrient solution and water can circulate therebetween. At the same time, the bottom surface of the seedling hole 11 is in contact with the convex point 23 to form a supporting gap so that the liquid circulates, which is conducive to the discharge of accumulated water and convenient for the management of alternating dry and wet.

[0026] Refer to the attached Figure 1-Figure 2 The edge of the seedling tray 1 is integrally formed with a supporting side skirt 17 for supporting the top surface of the tray 2, and ventilation grooves 25 are evenly opened on the supporting surface of the tray 2, so that an air flow channel can be formed between the supporting side skirt 17 and the top surface of the tray 2, which can ensure the continuous supply of oxygen to the roots, improve the root metabolic activity, and facilitate the absorption of nutrients and water.

[0027] Furthermore, the seedling hole 11 is in a trapezoidal shape, with an inner diameter gradually increasing from the bottom to the top, and an upper diameter of 30 mm and a bottom diameter of 10 mm; and in the present embodiment, the depth range of the seedling hole 11 is 36 mm, and in contrast, the depth of the tray 2 is 26 mm, which can support it.

[0028] Furthermore, in the present embodiment, the layout of the seedling holes 11 on the seedling tray 1 is 8*16, there are a total of 128 seedling holes 11, and the overall dimensions are 540mm*280mm; in some other embodiments, the number of seedling holes 11 and the overall dimensions can be selected according to specific needs.

[0029] Of course, in some other embodiments, the seedling hole 11 is in a trapezoidal shape, or a cone shape, with an inner diameter gradually increasing from the bottom to the top, and the depth of the seedling hole 11 ranges from 5mm to 200mm; for example, 5mm, 100mm and 200mm. At the same time, the depth of the tray 2 is adaptively changed to support it, and is specifically selected according to the needs of planting seedlings.

[0030] Refer to the attached Figure 5-Figure 8 In this embodiment, the side groove 13 extends from the side wall of the seedling hole 11 to its bottom and is connected with the water absorption hole 12. After the seedling hole 11 contacts the protrusion 23, the side groove 13 can be connected with the water permeable hole 21 in the middle of the protrusion 23, thereby forming a liquid flow channel to ensure that the nutrient solution and water can be replenished to the absorbent cotton strip 14 in time. At the same time, the absorbent cotton strip 14 is embedded in the side wall portion of the side groove 13 and extends to the bottom of the seedling hole 11, so that it can fully contact with the nutrient solution and water to ensure the accurate distribution of the nutrient solution.

[0031] Of course, in some other embodiments, the side groove 13 can be extended only to the bottom end of the seedling hole 11 without extending to its bottom surface; in order to avoid excessive water absorption affecting the draft depth, the selection can be made according to specific needs during the planting process.

[0032] It should be noted that, in the present embodiment, the seedling hole 11 is in the shape of a four-sided trapezoidal table, and side grooves 13 are provided on the four sides thereof, and absorbent cotton strips 14 are embedded therein; in some other implementations, the side grooves 13 may not be provided as needed, or other numbers of side grooves 13 and absorbent cotton strips 14 may be provided as needed, for example, two, three, six, etc., which may be all possible, and the selection may be made according to specific planting needs.

[0033] To ensure that the seedling tray 1 can be stably placed on the tray 2, in the present embodiment, the four corners of the inner wall of the tray 2 are integrally formed with limiting protrusions 24, and the limiting protrusions 24 are in contact with the side walls of the seedling holes 11 located at the four corners, so that the tray 2 can be stably supported, thereby limiting the position of the seedling tray 1, so that the water absorption hole 12 and the water permeable hole 21 can be accurately aligned to ensure accurate distribution of nutrient solution and water.

[0034] Refer to the attached Figure 1-Figure 2In this embodiment, the seedling tray 1 is made of polystyrene integrally injection-molded. The use of this material is not only low in cost, but also the seedling roots cannot penetrate its inner wall, thereby preventing the seedling roots from piercing the seedling tray 1. At the same time, the trapezoidal structure of the seedling hole 11 makes it easier to take out the seedlings without damaging the roots. It is also easy to clean and reuse, and will not easily breed bacteria. At the same time, the tray 2 is made of EPP foam, which can provide strong buoyancy by utilizing its low density characteristics. It is low in cost and can meet environmental protection requirements. After the seedlings are planted, they can float on the water to support the seedling tray 1, and have strong floating stability to ensure planting requirements.

[0035] Of course, in some other embodiments, the seedling tray 1 can be integrally injection molded using other materials such as polyvinyl chloride, polypropylene or degradable plastic; at the same time, the tray 2 is made of one of the other foam plastics except EPP foam, and uses its low density characteristics to float on the water surface to support the seedling tray 1.

[0036] Refer to the attached Figure 10-11 In this embodiment, a flow groove 26 is provided on the bottom surface of the tray 2 to match the water hole 21, which can ensure that the nutrient solution and water can flow sufficiently around the water hole 21, reduce the arc surface tension of the liquid in contact with the water hole 21 and the water surface, so that the liquid can flow sufficiently into the water hole 21, thereby ensuring that the seedlings can obtain sufficient nutrient solution and water.

[0037] Secondly, a positioning groove 29 is provided in the circulation groove 26 at a position corresponding to each water permeable hole 21, and activated carbon 3 is installed in the positioning groove 29 to adsorb impurities and bacteria in the nutrient solution and water to avoid root rot or.

[0038] Furthermore, in the present embodiment, the positioning groove 29 is in a rhombus shape; of course, other regular polygons or circles may also be selected; at the same time, the activated carbon 3 is in a rhombus-shaped block that matches it, and at the same time, a side hole 210 is provided on the side wall of the positioning groove 29 to facilitate the flow of liquid. This makes it convenient to embed and replace the activated carbon 3, and at the same time, a gap can be formed between it and the positioning groove 29 to facilitate the flow of liquid and avoid blockage of the flow of nutrient solution and water.

[0039] Of course, in some other embodiments, the circulation groove 26 may not be provided, and the tray 2 can be directly placed on the aquaculture water surface. The specific selection is made according to the planting scene and the size of the planting area. In the case of a small intermediate area of ​​water, the flow of nutrient solution and water in the water area is small, so the circulation groove 26 may not be provided.

[0040] Refer to the attached Figure 5-Figure 6 as well as Figure 10-11In order to facilitate the observation of the draft depth of the seedlings, an observation pillar 16 is integrally formed at the diagonal position of the seedling hole 11 at the bottom of the seedling tray 1, and a scale line is set on the inner wall of the observation pillar 16. At the same time, a mounting hole 28 for connecting the observation pillar 16 is opened on the tray 2. By extending the observation pillar 16 through the mounting hole 28 to the bottom thereof, not only the installation stability between the seedling tray 1 and the tray 2 can be increased, but also after the tray 2 is placed in the water area, the draft depth of the tray 2 is consistent with the depth of water in the observation pillar 16 by utilizing the principle of communicating vessels, and can be displayed by the scale line, so that the draft depth of the seedlings can be accurately observed, and it can be judged whether its draft depth meets the standard, so as to avoid excessive draft or shallow draft, which affects the growth of the seedlings.

[0041] Secondly, in order to adjust the draft depth, an installation groove 27 is opened on the bottom surface of the tray 2, and a floating bar 4 is embedded in the installation groove 27 as needed. In this embodiment, the installation groove 27 and the circulation groove 26 are arranged alternately. The staff can change the overall buoyancy of the device by adding or reducing the floating bars 4, thereby changing the draft depth, and observe whether the requirements are met by observing the scale lines in the pillars 16, so as to ensure that the seedlings are in a good planting environment to avoid root rot due to excessive water or drying up due to insufficient water, thereby improving the survival rate.

[0042] The working principle of the present invention is as follows: during planting, the seedlings are planted by filling the seedling hole 11 with a matrix. After the planting is completed, the seedling tray 1 is placed on the tray 2 and is limited by the limiting protrusion 24 so that the two can be stably engaged. At the same time, the water absorption hole 12 and the water permeable hole 21 can be accurately aligned to ensure the accurate distribution of nutrient solution and water. The device is then placed on the surface of the aquaculture waters.

[0043] Secondly, by observing the scale lines in the pillar 16, the draft depth of the seedlings is observed to determine whether the draft depth meets the standard. If it meets the standard, no adjustment is required; if it does not meet the standard, it is necessary to change the overall buoyancy of the device by adding or reducing the floating bars 4, thereby changing the draft depth until the planting requirements are met, thereby ensuring that the seedlings are in a good planting environment.

[0044] Finally, during the planting process, the protrusions 22 and the protrusions 23 are used to form gaps for liquid flow, so that the nutrient solution and water can circulate therebetween, which is beneficial for the discharge of accumulated water and facilitates the management of alternating dry and wet. The nutrient solution and water can be lifted upward through the absorbent cotton strips 14 and diffused into the matrix through the side suction holes 15 to avoid insufficient nutrition for the growth of seedlings. The nutrient solution is absorbed and stored in the absorbent cotton strips 14 to avoid the loss of the nutrient solution with the water flow, thereby ensuring the accurate distribution of the nutrient solution.

[0045] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A hydroponic floating tray seedling raising device with dynamic circulation and precise rationing of nutrient solution, characterized in that: It comprises a tray (2) and a seedling tray (1) placed on the tray (2); The seedling tray (1) is provided with an array of integrally formed seedling holes (11), and a water absorption hole (12) is provided at the center of the bottom of each seedling hole (11); the side walls of the seedling holes (11) are integrally formed with side grooves (13), and cotton strips (14) for absorbing nutrient solution and water are embedded in the side grooves (13); and side absorption holes (15) for diffusing nutrient solution and water to the seedlings are uniformly provided on the side grooves (13); The bottom of the tray (2) is provided with a water-permeable hole (21) perpendicularly opposite to the water-absorbing hole (12); the bottom wall of the tray (2) is provided with a protrusion (22), and a gap for liquid flow is formed between adjacent protrusions (22); and protrusions (23) for supporting the seedling hole (11) are evenly protruded on the protrusions (22), so as to form a supporting gap to allow liquid to circulate.

2. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: The edge of the seedling tray (1) is integrally formed with a supporting side skirt (17) for supporting the top surface of the tray (2), and ventilation grooves (25) are evenly arranged on the supporting surface of the tray (2) to form an air flow channel between the supporting side skirt (17) and the top surface of the tray (2).

3. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: The seedling hole (11) is in a trapezoidal shape, and the inner diameter gradually increases from the bottom to the top. The depth of the seedling hole (11) ranges from 5 mm to 200 mm, and the depth of the tray (2) changes adaptively relative to the depth to support it.

4. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: The side groove (13) extends from the side wall of the seedling hole (11) to the bottom thereof and is connected to the water absorption hole (12) to form a liquid flow channel. The water absorption cotton strip (14) is embedded in the side wall portion of the side groove (13) and extends to the bottom end of the seedling hole (11).

5. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: The four corners of the inner wall of the tray (2) are integrally formed with limiting protrusions (24), and the limiting protrusions (24) fit with the side walls of the seedling holes (11) located at the four corners to limit the position of the seedling tray (1).

6. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: It also includes activated carbon (3), the bottom surface of the tray (2) is provided with a circulation groove (26) adapted to the water permeable hole (21), and a positioning groove (29) for installing the activated carbon (3) is provided corresponding to each of the water permeable holes (21).

7. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 6 is characterized by: The positioning groove (29) is in the shape of a regular polygon or a circle, and the activated carbon (3) is in the shape of a polygon or a circle to match it. The side wall of the positioning groove (29) is provided with a side hole (210) to facilitate the flow of liquid.

8. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: An observation support (16) is integrally formed at the bottom of the seedling tray (1) at a diagonal position of the seedling hole (11), and a scale line is provided on the inner wall of the observation support (16). A mounting hole (28) for inserting the observation support (16) is provided on the tray (2), and the observation support (16) extends through the mounting hole (28) to the bottom thereof to display the draft depth.

9. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: It also comprises a floating bar (4), and a mounting groove (27) for mounting the floating bar (4) is provided on the bottom surface of the tray (2), so that the floating bar (4) can be mounted on the bottom of the tray (2) to change its immersion depth in water.

10. The hydroponic floating tray seedling raising device with dynamic circulation and precise nutrient solution distribution according to claim 1 is characterized by: The seedling tray (1) is made of polystyrene, polyvinyl chloride, polypropylene or a degradable plastic by integral injection molding, and the tray (2) is made of one of the foam plastics so as to float on the water surface to support the seedling tray (1).

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