Seedling pot and method for producing the same

Abstract

To provide a pot for raising seedling, having a bottom part composed of a plurality of tongue pieces, capable of preventing roots from being caught when the roots are extended through perforations and potted, and facilitating the potting.SOLUTION: The seedling pot includes an opening part 2 in which an upper end side of a peripheral surface part 1 is opened, and a bottom part 3 having a polygonal plane for closing a lower end side of the peripheral surface part 1, the bottom part 3 is composed of a plurality of tongue-piece parts 4 formed in the same shape, a tip part side 4a of each tongue-piece part 4 is welded to each other at an axial center overlapping part side 5a, a plurality of side edge overlapping part side 5b are formed separately around an axial center O, and the overlapping part side 5b radially extends toward each top part side 3a of a peripheral edge 3b of the bottom part 3. In the peripheral edge 3a of the bottom part 3, at a position apart from each top part 3b, a cutout part 7 is formed in the bottom part 3 and the peripheral surface part 1 only at an intermediate position of the peripheral edge 3a, with the peripheral edge 3a of the bottom part 3 as a root.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a pot for raising seedlings of trees such as fruit trees, flowers, vegetables, etc., and in particular to a pot having a bottom made up of multiple tongues. [Background technology]

[0002] As conventionally known seedling raising pots, the seedling raising pots disclosed in Patent Documents 1 and 2 are known. These seedling pots have a cylindrical peripheral surface with an opening at the top end and a polygonal bottom that closes the bottom end. The bottom consists of multiple identical tongues that are integral with the polygonal periphery of the bottom. In such seedling pots, perforations for root passage are formed at the boundary between the tongue portion and the peripheral portion to facilitate folding the tongue portion toward the axis O side. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2022-001030 [Patent Document 2] Patent Publication No. 2024-069824 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the perforations 1a are used, the elongated roots 12 extend out of the seedling pot through the perforations 1a, as shown in Figure 20. A plurality of these perforations 1a are formed on one side of the polygonal periphery of the bottom 3. In this state, when the grown seedling 11 is potted up, the extended roots 12 tend to become entangled with the roots 12 coming out of the adjacent perforations 1a, and because each perforation 1a is thin, it tends to get caught, making it difficult to pot up unless the extended roots 12 are cut. On the other hand, the seedling 11 whose roots 12 have been cut may be prevented from growing further, and may become more susceptible to disease. Furthermore, in a seedling pot having a polygonal bottom 3 made up of tongue portions 4, if a rooting structure is formed at the corners of the bottom 3 (each apex of the bottom 3), the corners that support the bottom 3 will be missing, causing a decrease in the strength of the bottom 3. To provide a seedling raising pot having a polygonal bottom 3 consisting of a plurality of tongue portions 4, which prevents elongated roots 12 from getting caught on perforations 1a, facilitates potting, and ensures sufficient strength of the bottom 3. [Means for solving the problem]

[0005] The seedling pot according to the first aspect of the present invention comprises a cylindrical peripheral portion (1), An opening (2) at the upper end side of the peripheral surface portion (1), a bottom portion (3) having a polygonal plane that closes the lower end side of the peripheral surface portion (1); The bottom portion (3) is made up of a plurality of tongue portions (4) formed in a mountain shape including a trapezoid, The tongue portion (4) has a tip portion (4a) that reaches the axis (O) of the bottom portion (3), side portions (4b) located on both sides in the width direction of the tip portion (4a), and a base portion (4c) that forms one side of the polygonal peripheral edge (3a) of the bottom portion (3), The bottom portion (3) has an axial overlapping portion (5a) where the tip portions (4a) of the tongue portions (4) overlap around the axial center (O), and a side overlapping portion (5b) where the side portions (4b) of adjacent tongue portions (4) overlap, In a seedling pot, the tip portions (4a) of the tongue portions (4) are fixed to each other at the axial overlapping portion (5a), and a plurality of the side overlapping portions (5b) are formed at intervals around the axial center (O), Each side overlapping portion (5b) extends radially toward each apex (3b) of the peripheral edge (3a), This seedling pot is characterized in that a notch (7) is formed on at least one of the bottom (3) and peripheral surface (1) at a position away from each top (3b) and only at the middle position of the peripheral edge (3a), with the peripheral edge (3a) as the base.

[0006] The seedling raising pot according to the second invention is the seedling raising pot according to the first invention, The notch (7) has a peripheral notch (7a) extending from the base of the peripheral edge (3a) of the peripheral surface (1) toward the opening (2), and a bottom notch (7b) extending from the peripheral edge (3a) of the bottom surface (3) toward the axis (O), The seedling pot is characterized in that an L-shaped cutout portion (7) is formed by cutting out a peripheral cutout portion (7a) and a bottom cutout portion (7b) integrally.

[0007] The seedling raising pot according to the third invention is the seedling raising pot according to the first invention, The cutout portion (7) has an additional slit (8) formed continuously from its end, As an additional slit (8), a peripheral additional slit (8a) extending from the tip of the peripheral cutout portion (7a) toward the opening (2); a bottom additional slit (8b) extending from the tip of the bottom notch portion (7b) toward the axis (O) and not reaching each overlapping portion (5a, 5b); This seedling pot is characterized in that at least one pair of peripheral additional slits (8c) are formed from both sides of the wide portion (7c) so as not to reach the top (3b).

[0008] The seedling pot according to the fourth aspect of the present invention comprises a cylindrical peripheral portion (1), An opening (2) at the upper end side of the peripheral surface portion (1), a bottom portion (3) having a polygonal plane that closes the lower end side of the peripheral surface portion (1); The bottom portion (3) is made up of a plurality of tongue portions (4) formed in a mountain shape including a trapezoid, The tongue portion (4) has a tip portion (4a) that reaches the axis (O) of the bottom portion (3), side portions (4b) located on both sides in the width direction of the tip portion (4a), and a base portion (4c) that forms one side of the polygonal peripheral edge (3a) of the bottom portion (3), The bottom portion (3) has an axial overlapping portion (5a) where the tip portions (4a) of the tongue portions (4) overlap around the axial center (O), and a side overlapping portion (5b) where the side portions (4b) of adjacent tongue portions (4) overlap, In a seedling pot, the tip portions (4a) of the tongue portions (4) are fixed to each other at the axial overlapping portion (5a), and a plurality of the side overlapping portions (5b) are formed at intervals around the axial center (O), Each side overlapping portion (5b) extends radially toward each apex (3b) of the peripheral edge (3a), The peripheral edge (3a) has slits (9) formed integrally with the peripheral surface portion (1) and the bottom portion (3) only at the intermediate position of the peripheral edge (3a) away from each of the top portions (3b), The slits (9) are formed in a cross shape or a cross shape with horizontal slits (9a) and vertical slits (9b) in the expanded state of the seedling pot, where the cross and X shapes are combined at their intersections, and The seedling pot is characterized in that the horizontal slits (9a) are formed on the periphery (3a).

[0009] The seedling pot according to the fifth aspect of the present invention comprises a cylindrical peripheral portion (1), An opening (2) at the upper end side of the peripheral surface portion (1), a bottom portion (3) having a polygonal plane that closes the lower end side of the peripheral surface portion (1); The bottom portion (3) is made up of a plurality of tongue portions (4) formed in a mountain shape including a trapezoid, The tongue portion (4) has a tip portion (4a) that reaches the axis (O) of the bottom portion (3), side portions (4b) located on both sides in the width direction of the tip portion (4a), and a base portion (4c) that forms one side of the polygonal peripheral edge (3a) of the bottom portion (3), The bottom portion (3) has an axial overlapping portion (5a) where the tip portions (4a) of the tongue portions (4) overlap around the axial center (O), and a side overlapping portion (5b) where the side portions (4b) of adjacent tongue portions (4) overlap, In a seedling pot, the tip portions (4a) of the tongue portions (4) are fixed to each other at the axial overlapping portion (5a), and a plurality of the side overlapping portions (5b) are formed at intervals around the axial center (O), Each side overlapping portion (5b) extends radially toward each apex (3b) of the peripheral edge (3a), The tip (5d) of the side overlapping portion (5b) reaches each of the apexes (3b) of the peripheral edge (3a), The side overlapping portion (5b) has its tip (5d) as a vertex, and one side (4ba) of the side portion (4b) of the tongue portion (4) intersects with the other side (4bb) of the side portion (4b) of the tongue portion (4) adjacent to that tongue portion (4) at an overlapping angle (α); When the angle formed by the apex (3b) of the polygon of the base (3) is angle (β), The relationship between the overlap angle (α) and the angle (β) formed by the apex (3b) is as follows: 0.31×β ≦ α ≦ 0.35×β This is a seedling pot characterized by the following:

[0010] The seedling raising pot according to the sixth invention is the seedling raising pot according to any one of the first to fourth inventions, There are no perforations formed at the boundary between each tongue portion (4) and the lower end of the peripheral portion (1) through which the roots can pass, The tip (5d) of the side overlapping portion (5b) reaches each apex (3b) of the peripheral edge (3a), The seedling pot is characterized in that each side overlapping portion (5b) has a gap in the overlapping direction of the tongue portions (4).

[0011] The seedling raising pot according to the seventh invention is the seedling raising pot according to any one of the first to fourth inventions, Each tongue portion (4) is formed in the same shape, and the polygonal periphery (3a) of the bottom portion (3) is formed in a regular polygon. This seedling pot is characterized in that at least one of the notch (7), the additional slit (8) or the slit (9) is formed on each side of the regular polygonal periphery (3a) of the bottom (3).

[0012] The method for producing a seedling pot according to the eighth invention is the method for producing a seedling pot according to any one of the first to fifth inventions, When the seedling pot is in an unfolded state, a virtual line that bisects the angle γ between the bottom portion (4c) and one side (4ba) of the side portion (4b) of the tongue portion (4) is defined as a first virtual line (6b), and a virtual line that bisects the angle γ between the bottom portion (4c) and the other side (4bb) of the side portion (4b) of the tongue portion (4) is defined as a second virtual line (6a). Each side overlapping portion (5b) is formed in a state in which one side edge (4ba) of a tongue portion (4) is located near or coincident with the second imaginary line (6a) of the tongue portion (4) adjacent to that tongue portion (4), and the first imaginary line (6b) of the tongue portion (4) is located near or coincident with the other side edge (4bb) of the tongue portion (4) adjacent to that tongue portion (4), Each side overlapping portion (5b) has its tip (5d) as a vertex, and one side (4ba) of the tongue portion (4) intersects with the other side (4bb) of the tongue portion (4) adjacent to that tongue portion (4) at an overlapping angle (α), One side edge (4ba) of each tongue portion (4) is overlapped with one side of the front or back of the other side edge (4bb) of the tongue portion (4) adjacent to the respective tongue portion (4), The method for producing seedling pots includes a step of fixing the tip portions (4a) of the tongue portions (4) at the axial overlap portions (5a). [Effects of the Invention]

[0013] The seedling pot described in the first invention has a configuration in which a notch 7 is formed on at least one of the bottom 3 and the peripheral surface 1, with the peripheral edge 3a as its base, at a position away from each top 3b and only at the middle position of the peripheral edge 3a. As in the above configuration, a notch 7 with the peripheral edge 3a as its base is formed in at least one of the bottom 3 or the peripheral surface 1, so that the extended roots can preferentially escape to the outside of the seedling pot through the notch 7, and when the grown plant seedlings are removed from the seedling pot, they can be removed without cutting the extended roots. Furthermore, the notch 7 is formed only at the middle position of the peripheral edge 3a, and is away from each top 3b and each side overlapping portion 5b (it is formed at a position where it does not come off the portion 5c where adjacent tongue portions 4 do not overlap), so the notch 7 can be formed while ensuring the strength of the bottom 3 made up of the tongue portions 4 without missing any of the portions supporting the bottom 3 (each top 3b and each side overlapping portion 5b).

[0014] The seedling pot described in the second invention has the above-mentioned configuration, in which the cutout portion 7 has a peripheral cutout portion 7a extending from the peripheral portion 1 and the base of the peripheral edge 3a toward the opening 2, and a bottom cutout portion 7b extending from the peripheral edge 3a of the bottom surface 3 toward the axis O, and has a configuration in which an L-shaped cutout portion 7 is formed in which the peripheral cutout portion 7a and the bottom cutout portion 7b are cut out integrally. With the above configuration, the cutout portion 7 can be formed larger than in the first aspect of the invention, so that the elongated roots of the plant can be preferentially guided through the cutout portion 7 to the outside of the seedling pot more appropriately.

[0015] The seedling pot described in the third invention is characterized in that the cutout portion 7 has additional slits 8 formed continuously from its end, and the additional slits 8 include at least one pair of peripheral additional slits 8c out of the peripheral additional slits 8a extending from the tip of the peripheral cutout portion 7a toward the opening 2, the bottom additional slits 8b extending from the tip of the bottom cutout portion 7b toward the axis O and not reaching each overlapping portion 5a, 5b, and the peripheral additional slits 8c that do not reach the top 3b from both sides of the wide portion 7c. With the above-mentioned configuration, when the seedling is potted up from the seedling raising pot, the seedling can be taken out without damaging the extended roots on the edge of the notched portion 7. Furthermore, since a pair of peripheral additional slits 8c are formed, the periphery of the notched portion 7 of the tongue portion 4 can be easily bent, facilitating the formation of the bottom portion 3 of the seedling raising pot.

[0016] The seedling pot described in the fourth invention is a seedling pot having a bottom 3 consisting of multiple tongue portions 4, and slits 9 are formed integrally in the peripheral portion 1 and bottom 3 on the peripheral edge 3a of the bottom 3, at positions away from each top portion 3b, only at the middle position of the peripheral edge 3a.When the seedling pot is unfolded, the slits 9 are formed in the shape of a cross and an X, each having a horizontal slit 9a and a vertical slit 9b, combined at their intersections, or in the shape of a cross, and the horizontal slits 9a are formed on the peripheral edge 3a. This configuration allows the elongated roots of the plant to preferentially escape to the outside of the seedling-raising pot through the slits 9. Furthermore, when potting up the seedling, the seedling can be removed without damaging the elongated roots through the slits 9. Furthermore, a slit 9 is formed at the middle position of the peripheral edge 3a, away from each top 3b and each side overlapping portion 5b (formed at a position where it does not come off the portion 5c where adjacent tongue portions 4 do not overlap), so that the cutout portion 7 can be formed while ensuring the strength of the bottom 3 consisting of the tongue portions 4 without missing any of the portions supporting the bottom 3 (each top 3b and each side overlapping portion 5b). Furthermore, since the horizontal slits 9a are formed, the tongue portion 4 can be easily bent around the slits 9, facilitating the formation of the bottom portion 3 of the seedling raising pot.

[0017] In the seedling pot according to the fifth invention, the tip 5d of the side overlapping portion 5b reaches each apex 3b of the periphery 3a, and the side overlapping portion 5b has its tip 5d as its apex, and one side 4ba of the side portion 4b of the tongue portion 4 and the other side 4bb of the side portion 4b of the tongue portion 4 adjacent to that tongue portion 4 intersect at an overlapping angle α, and when the angle formed by the apex 3b of the polygon of the bottom 3 is angle β, The relationship between the overlapping angle α and the angle β formed by the apex 3b is as follows: 0.31×β ≦ α ≦ 0.35×β This is characterized by the fact that When the relationship between the overlapping angle α and the angle β formed by the apex 3b is within the above range, the outer shape of the peripheral edge 3a of the bottom 3 will be a neat polygonal shape. Furthermore, the bottom 3 having the tongue portion 4 can have a good overlap of the side overlapping portion 5b, which is a factor in ensuring the strength and drainage of the bottom 3. This makes it difficult for the side edges 4b to come apart, ensuring strength near the axis O of the bottom 3. This allows the weight of the culture soil to be supported by the entire bottom 3, resulting in a seedling pot that is less likely to break through. Furthermore, within this range, sufficient drainage can be ensured.

[0018] The seedling raising pot described in the sixth invention is characterized in that, in the seedling raising pot described in any of the first to fourth inventions, no perforations through which roots can pass are formed at the boundary between each tongue portion 4 and the lower end of the peripheral portion 1. The above configuration does not have a perforation for folding the tongue portion 4 at the boundary (peripheral edge 3a) between the tongue portion 4 and the peripheral portion 1 through which roots can pass (in other words, where roots can become entangled), and also has the configuration of the notch portion 7, additional slit 8, and slit 9 of any of the first to fourth inventions. Therefore, when the grown seedling 11 is potted up, the extended roots 12 do not get entangled with the roots 12 coming out from the adjacent perforations 1a and do not get caught on the perforations 1a, so that the extended roots 12 can be easily potted up without cutting them. Furthermore, since the wide portion 7c of the notch 7 or the horizontal slit 9a of the slit 9 is formed at the position of the peripheral edge 3a, even if no perforation is formed at the boundary (periphery 3a) between the tongue portion 4 and the peripheral surface portion 1, the tongue portion 4 becomes easy to bend, making it easy to form the seedling pot. Furthermore, when at least one pair of peripheral additional slits 8c are formed among the additional slits 8, the tongue portion 4 becomes easier to bend than when only the notched portion 7 is used, making it easier to form the seedling pot.

[0019] The seedling raising pot described in the seventh invention is characterized in that, in the seedling raising pot described in any of the first to fourth inventions, each tongue portion 4 is formed in the same shape, the polygonal peripheral edge 3a of the bottom 3 is formed in a regular polygon, and at least one of the notch portion 7, additional slit 8 or slit 9 is formed on each side of the regular polygonal peripheral edge 3a of the bottom 3. With this configuration, the outer shape of the peripheral edge 3a of the bottom 3 becomes a neat regular polygon, and the notches 7 and additional slits 8 or slits 9 formed on each side allow the extended roots to exit the seedling pot through the notches 7, additional slits 8 or slits 9 on each side, and since the notches 7 and additional slits 8 or slits 9 are formed at a distance to prevent the extended roots from becoming tangled, the extended roots do not become tangled, and when the grown plant seedlings are removed from the seedling pot, they can be removed without cutting the extended roots.

[0020] The eighth aspect of the present invention is a method for manufacturing a seedling pot according to any one of the first to fifth aspects of the present invention, wherein when the seedling pot is in an expanded state, an imaginary line that bisects the angle γ between the bottom portion 4c and one side 4ba of the side portion 4b of the tongue portion 4 is defined as a first imaginary line 6b, and an imaginary line that bisects the angle γ between the bottom portion 4c and the other side 4bb of the side portion 4b of the tongue portion 4 is defined as a second imaginary line 6a, Each side overlapping portion 5b is formed in a state in which one side 4ba of a tongue portion 4 is located near or coincident with the second imaginary line 6a of the tongue portion 4 adjacent to that tongue portion 4, and the first imaginary line 6b of the tongue portion 4 is located near or coincident with the other side 4bb of the tongue portion 4 adjacent to that tongue portion 4, Each side overlapping portion 5b has a tip 5d as its apex, and intersects one side 4ba of the tongue portion 4 with the other side 4bb of the tongue portion 4 adjacent to that tongue portion 4 at an overlapping angle α, and one side 4ba of each tongue portion 4 is overlapped with one side of the front or back of the other side 4bb of the tongue portion 4 adjacent to that tongue portion 4, This method of manufacturing seedling pots includes a step of fixing the tip portions 4a of the tongue portions 4 at the axial overlap portions 5a. With this configuration, the polygonal shape of the periphery 3a of the bottom 3 can be formed without difficulty, making it easy to form the seedling pot. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a front view of a first embodiment of a seedling raising pot according to the present invention. [Figure 2] FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2 . [Figure 4] FIG. [Figure 5] FIG. 4 is an explanatory diagram showing the overlapping state of the tongue portions 4 of the bottom surface 3 of the embodiment. [Figure 6] FIG. 10 is a perspective view showing the state of use of the embodiment; [Figure 7] 1 is a development view of a first embodiment of a seedling raising pot according to the present invention. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] FIG. 10 is a development view of a third embodiment of the seedling raising pot of the present invention. [Figure 11] FIG. [Figure 12] FIG. [Figure 13] FIG. 10 is a perspective view of a fourth embodiment of the seedling raising pot of the present invention. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] 16 is an enlarged longitudinal cross-sectional view showing the drainage effect of the embodiment, and is an enlarged cross-sectional view taken along the line XVI-XVI in FIG. 17. [Figure 17] FIG. [Figure 18] 1A is a bottom view showing another example of the seedling raising pot of the present invention, and FIG. 1B is an enlarged view of the cross section taken along the line BB in FIG. 1A. [Figure 19] FIG. 10 is a bottom view showing yet another example of the seedling raising pot of the present invention. [Figure 20] FIG. 1 is a perspective view showing a conventional seedling raising pot in use. DETAILED DESCRIPTION OF THE INVENTION

[0022] Next, each embodiment of the present invention will be described with reference to the drawings. The seedling pots described below can be made of nonwoven fabric, paper, plastic materials, biodegradable materials, etc. First, common parts of the first to third embodiments will be described.

[0023] In each embodiment, as shown in Figures 1 and 2, the peripheral portion 1 is formed in a cylindrical shape, and an opening 2 is formed at the upper end side of the peripheral portion 1. As shown in Figure 3, the lower end side of the peripheral portion 1 is formed with a pentagonal bottom portion 3 that closes the lower end. As shown in FIGS. 3 and 5, the bottom portion 3 is made up of a plurality of tongue portions 4 of the same shape, and each tongue portion 4 has a trapezoidal planar surface. Each tongue portion 4 has a tip portion 4a that reaches the axis O of the bottom portion 3, side portions 4b located on both sides in the width direction of the tip portion 4a, and a base portion 4c that forms one side of the pentagonal peripheral edge 3a of the bottom portion 3. In other words, the base portions 4c of each tongue portion 4 are continuously arranged in a ring shape to form the pentagonal peripheral edge 3a of the bottom portion 3. Each tongue portion 4 is formed integrally with the lower end of the peripheral surface portion 1 (periphery 3a of the bottom portion 3). In this embodiment, the periphery of the opening 2 is formed in a circular shape.

[0024] As shown in Figures 4 and 6, the bottom 3 has an axial overlapping portion 5a where the tip portions 4a of each tongue portion 4 overlap around its axis O, and a side overlapping portion 5b where the side portions 4b of adjacent tongue portions 4 overlap. As shown in Figures 3, 4(A) and 4(B), the tip portions 4a of the tongue portions 4 are fixed to each other at the axial overlap portion 5a, and in this example, a welded portion 10 is formed there. As shown in FIG. 3, a plurality of side overlapping portions 5b are formed around the axis O at intervals. In this embodiment, five tongue portions 4 overlap at their respective side edges 4b, forming five side edge overlapping portions 5b. Each overlapping portion 5b extends radially from the axis O toward the apex 3b (corner of the base 3) of the pentagonal peripheral edge 3a of the base 3. In this embodiment, unlike the seedling pot of the background art, there is no perforation 1a formed at the boundary between the tongue portion 4 and the peripheral portion 1 (periphery 3a of the bottom 3) through which roots can pass (and into which roots are likely to become entangled). [Example]

[0025] In the first embodiment, as shown in Figures 1, 2, and 4, a notch 7 is formed on the polygonal peripheral edge 3a of the bottom 3 at a position away from each apex 3b (corner of the bottom 3) and at the midpoint of each side of the peripheral edge 3a, with the peripheral edge 3a as the base. This cutout portion 7 has a peripheral cutout portion 7a extending from the base of the peripheral surface portion 1 and the peripheral edge 3a toward the opening 2, and a bottom cutout portion 7b extending from the polygonal peripheral edge 3a of the bottom portion 3 toward the axis O. As shown in Figure 4, the peripheral cutout portion 7a and the bottom cutout portion 7b are cut out together to form a cutout portion 7 having a substantially L-shaped vertical cross section. 2 and 3, the cutout 7 has a wide portion 7c at the position of the peripheral edge 3a that is wider than the width of other positions of the cutout 7. The wide portion 7c is formed so as not to reach the top 3b of the bottom 3 (the corner of the bottom 3). As shown in the development view of FIG. 5, the notch 7 is formed in advance in a portion that will become the peripheral edge 3a of the polygon of the bottom 3.

[0026] Here, when the bottom 3 is made up of multiple tongue portions 4, forming a notch 7 at each apex 3b (corner of the bottom 3) of the polygon makes it difficult to ensure the strength of the bottom 3. Furthermore, if the formation positions of each side overlapping portion 5b and the bottom notch 7b overlap, the strength of the side overlapping portion 5b decreases, making it even more difficult to ensure the strength of the bottom 3. In this embodiment, the notches 7 are formed only at the middle positions of each side of the peripheral edge 3a, away from each top 3b (corner of the bottom 3).The bottom notches 7b are formed at positions that do not overlap with the side edge overlapping portions 5b. This configuration makes it possible to form the notched portion 7 in a seedling raising pot whose bottom 3 is made up of multiple tongue portions 4. As a result, the loss of strength of the bottom 3 against load is reduced, resulting in a seedling raising pot with a bottom 3 that has sufficient strength. Furthermore, this seedling pot does not have perforations 1a at the boundary between the tongue portion 4 and the peripheral portion 1 (periphery 3a of the bottom portion 3) that could cause the extended roots 12 to get caught. Instead, peripheral notch portion 7a and bottom notch portion 7b are cut out together to form notch portion 7 with a substantially L-shaped cross section, and wide portion 7c is formed at the position of peripheral edge 3a of notch portion 7. This configuration allows the notch 7 to be formed large, and as shown in Figure 1, the elongated roots 12 of the plant can be preferentially released to the outside of the seedling raising pot through the notch 7. Therefore, when the grown seedling 11 of the plant is removed from the seedling raising pot, the seedling 11 can be removed without cutting the elongated roots 12. Furthermore, since the wide portion 7c is formed at the position of the peripheral edge 3a, the tongue portion 4 can be easily folded even if the perforations 1a are not formed on the peripheral edge 3a, facilitating the formation of a seedling pot.

[0027] In the first embodiment, the shape of the cutout portion 7 is not limited to the shape shown in Figures 1 to 6 (sharp ends in the longitudinal and width directions of the cutout portion 7). For example, the cutout portion 7 may have rounded ends in the longitudinal and width directions, or may be elliptical. Furthermore, the cutout 7 is not limited to a cutout 7 having a substantially L-shaped cross section, but may be either a peripheral cutout 7a or a bottom cutout 7b. In this case, it is preferable that the base of the peripheral edge 3a of the peripheral cutout 7a or the base of the peripheral edge 3a of the bottom cutout 7b forms a wide portion 7c. [Example]

[0028] In the first embodiment, when the grown seedling is potted up, the extended roots may be damaged by the edge of the notched portion 7. The second embodiment solves this problem. In the second embodiment, as shown in FIGS. 7, 8 and 9, an additional slit 8 is formed around the cutout portion 7. This additional slit 8 is formed of four slits 8a, 8b, 8c: a peripheral additional slit 8a extending from the tip of the peripheral cutout portion 7a toward the opening 2; a bottom additional slit 8b extending from the tip of the bottom cutout portion 7b toward the axis O and not reaching each overlapping portion 5a, 5b; and a pair of peripheral additional slits 8c extending from both sides of the wide portion 7c and not reaching the apex 3b of the polygon of the bottom 3. With this configuration, when the grown seedlings are removed from the seedling raising pot, the extended roots are pulled up as the additional slits 8a, 8b, 8c are retracted into the seedling raising pot, allowing the extended roots to be smoothly removed from the notched portion 7. Therefore, the seedlings can be removed without damaging the extended roots on the edges of the notched portion 7. In addition, a pair of peripheral additional slits 8c are formed at the peripheral edge 3a, continuing from both widthwise ends of the wide portion 7c, making it even easier to fold the tongue portion 4 even if no perforation 1a is formed on the peripheral edge 3a.

[0029] However, if the axial overlapping portion 5a and the side overlapping portion 5b are cut off by the bottom additional slit 8b, the strength of the bottom portion 3 may be reduced. Therefore, if the tip of the bottom notch portion 7b extends to the vicinity of the axial overlap portion 5a and the side overlap portion 5b and there is no room to form the bottom additional slit 8b, the bottom additional slit 8b can be formed to a short length or the bottom additional slit 8b can be omitted. The additional slit 8 may have at least one of the four slits: the peripheral surface additional slit 8a, the bottom additional slit 8b, and the two peripheral edge additional slits 8c. [Example]

[0030] The third embodiment differs from the first embodiment in that a slit 9 is used instead of the notch 7 to form a structure for root exposure. In this embodiment, as shown in FIGS. 10, 11 and 12, slits 9 are integrally formed in the peripheral surface portion 1 and the bottom portion 3. In the unfolded state, the slit 9 is formed in the shape of a cross having a horizontal slit 9a and a vertical slit 9b, and an X shape combined at the intersection of the cross and the intersection of the X (a shape in which an asterisk-shaped slit and a horizontal slit 9a passing through the center of the asterisk-shaped slit are added). The horizontal slit 9a is formed on the peripheral edge 3a. This configuration allows the elongated roots of the plant to preferentially escape through the slits 9 to the outside of the seedling pot. Furthermore, because the slits 9 are shaped by combining cross-shaped and X-shaped intersections, the edges of the horizontal slits 9a and vertical slits 9b are easily deformed by the action of the diagonal slits 9c in addition to the horizontal slits 9a and vertical slits 9b. Therefore, when the grown seedlings are repotted from the seedling pot, the horizontal slits 9a, vertical slits 9b, and diagonal slits 9c are easily pulled into the interior of the seedling pot as the elongated roots are pulled up, allowing the elongated roots to be smoothly removed from the slits 9. As a result, the seedlings can be removed without damaging the elongated roots with the slits 9 during repotting. Furthermore, since the horizontal slit 9a is formed on the peripheral edge 3a, the tongue portion 4 can be easily folded in even if the perforation 1a is not formed on the peripheral edge 3a. The slit 9 is not limited to a shape in which a cross intersection portion and an X intersection portion are combined, but may be a cross shape.

[0031] In the seedling raising pots of the first to third embodiments, the planar shape of the tongue portion 4 is formed to be trapezoidal, but the top of the tongue portion 4 may be curved to be mountain-shaped. Furthermore, the number of side overlapping portions 5b of the present invention is determined by the number of tongue portions 4. For example, if the peripheral edge 3a of the bottom 3 is rectangular, it will be made up of four tongue portions 4, which will form four side overlapping portions 5b. If the peripheral edge 3a of the bottom 3 is hexagonal, it will be made up of six tongue portions 4, which will form six side overlapping portions 5b. In the first embodiment, only one notch 7 is formed at the midpoint of each side of the periphery 3a, but this is not limiting and two or more may be formed in parallel. In this case, the wide portions 7c of the notches 7 are preferably located near the position that bisects one side of the periphery 3a. The same can be said for the slits 9 in the third embodiment. In the first embodiment, the notches 7 are formed on each side of the periphery 3a, but this is not limitative and they may be formed on only one side. The same can be said for the slits 9 in the third embodiment. In the first to third embodiments, the fixing means for the shaft center overlapping portion 5a is the welded portion 10, but instead of this, the shaft center overlapping portion 5a may be bonded with an adhesive. Moreover, instead of welding, the shaft center overlapping portion 5a may be fixed by sewing. One example of a case where sewing is used is when the size of a seedling pot is increased and welding cannot cope with the weight of the culture soil. In this case, it is preferable that not only the axial overlapping portion 5a but also the side overlapping portion 5b be sewn.

[0032] In the first to third embodiments, the extended roots 12 may come out from the gaps in the side overlapping portions 5b. In this case, there is a risk that roots 12 from the gaps in the side overlapping portions 5b and roots 12 from the bottom cutout portions 7b (or slits 9) will become entangled, and the seedlings cannot be potted up unless the entangled roots are cut off. Also, if the tip of the bottom cutout portion 7b reaches the axial center overlapping portion 5a, there is a risk that the tongue portions 4 will not be able to be welded together at the axial center overlapping portion 5a. In the first embodiment, as shown in Figures 3 and 6, the tip of the bottom cutout portion 7b is located near the center of the non-overlapping portion 5c of the tongue portion 4, and it is preferable that the position of the base of the bottom cutout portion 7b (wide portion 7c) is near the position that bisects one side of the peripheral edge 3a. However, provided that the roots 12 emerging from each bottom cutout 7b do not become entangled, the tip of the bottom cutout 7b may be formed beyond the non-overlapping portion 5c as long as it does not reach the welded portion 10. The same can be said for the slit 9 of the third embodiment, as shown in FIG.

[0033] In the seedling raising pots of the first to third embodiments, the polygonal shape of the bottom 3 is pentagonal, but it may also be square or hexagonal. The polygonal shape of the bottom 3 that allows for easy overlapping of the tongue portions, increases the capacity for culture soil, ensures sufficient bottom strength, and ensures a certain level of drainage is best in the form of a pentagon (five tongue portions 4), followed by a square (four tongue portions 4) and a hexagon (six tongue portions 4). The polygonal shape of the bottom 3 is such that each tongue portion 4 is formed in the same shape, and a polygonal periphery 3a is formed from each of the base portions 4c, so that the bottom 3 is a regular polygon as shown in Figures 3, 6, 9, and 12 (here, "regular polygon" includes not only regular polygons, but also shapes in which the apex 3b of a regular polygon is rounded, and shapes that can be said to be approximately regular polygons within the range of dimensional error). However, in the seedling raising pots of the first to third embodiments, the shapes of the tongue portions 4 do not have to be the same. For example, in the case of a quadrilateral, the polygonal shape of the bottom portion 3 can also be a rectangle, a rhombus, or a parallelogram. The periphery of the opening 2 is not limited to being circular in plan view. [Example]

[0034] The fourth embodiment is characterized by the overlapping relationship of the side overlapping portions 5b of the bottom portion 3. The strength of the side overlapping portion 5b of the bottom portion 3 is ensured by the overlap of the adjacent tongue portions 4. Each side overlapping portion 5b has a gap in the overlapping direction of the tongue portions 4 to improve drainage at the position of the side overlapping portion 5b. In order to maintain the overall strength of the bottom surface 3, it is necessary to ensure the strength of the side overlapping portion 5b, while at the same time, it is necessary to improve the drainage of the bottom 3 to prevent root rot. When the overlap between the side edges 4b of adjacent tongue pieces 4 increases, the overlap between the side edges 4b becomes difficult to come apart, thereby ensuring the strength of the bottom 3. On the other hand, the gap between the side edge overlapping portions 5b is small, and if the overlap becomes large, drainage from that area becomes poor. Conversely, if the overlapping becomes smaller, the drainage becomes better, but on the other hand, the overlapping between the side edges 4b of the adjacent tongue pieces 4 becomes more likely to come apart, and the strength of the bottom 3 cannot be maintained.

[0035] FIG. 13 is a perspective view of the fourth embodiment, FIG. 14 is a development view thereof, and FIG. 15 is a bottom view of FIG. 13 to 15, the notched portion 7 or the slit 9 is omitted for the sake of simplicity. 15, the tip 5d of the side overlapping portion 5b reaches the apex 3b of the polygon of the peripheral edge 3a. In addition, each tongue portion 4 is formed in the same shape. Therefore, the length a of one side 4ba and the length b of the other side 4bb, which face each other and have the tip 5d as the apex, are equal. Here, the meaning of "the length a of one opposing side 4ba and the length b of the other side 4bb are equal" also includes cases where the length a of one side 4ba with the tip 5d as the vertex and the length b of the other side 4bb are approximately equal (due to dimensional errors, etc.).

[0036] The side overlap portion 5b has its tip 5d as its apex, and one side 4ba of the side portion 4b of the tongue portion 4 intersects with the other side 4bb of the side portion 4b of the tongue portion 4 adjacent to that tongue portion 4 at an overlap angle α.When the angle formed by the apex 3b of the polygon of the bottom 3 is angle β, in the polygonal bottom 3 of the seedling pot (see Figure 15), the overlap angle α of the side overlap portion 5b is smaller than the angle β of the apex 3b of the polygon of the bottom 3. The relationship between the overlap angle α and the angle β of the apex 3b is as follows: 0.31×β ≦ α ≦ 0.35×β When the angle is in the range, the outer shape of the peripheral edge 3a of the bottom 3 is polygonal. Furthermore, each side overlapping portion 5b has a good overlap to ensure the strength of the bottom portion 3 and does not significantly impede drainage. If 0.31×β<α, the overlap between the side edges 4b becomes too small, making it difficult to ensure sufficient strength. If 0.305×β<α, the polygonal shape of the bottom 3 cannot be formed. If α < 0.35×β, the overlap between the side edges 4b becomes too large, making it difficult to ensure drainage. Also, if α < 0.355×β, the polygonal shape of the bottom 3 cannot be formed. The relationship between the overlap angle α and the angle β of the apex 3b is as follows: 0.32×β ≦ α ≦ 0.34×β When the thickness is in the range, the outer shape of the peripheral edge 3a of the bottom 3 is a neat polygon. In addition, each side overlap portion 5b has an overlap that is optimal for ensuring the strength of the bottom portion 3 and does not impede drainage. This ensures strength in the vicinity of the axis O of the bottom 3. As a result, the weight of the culture soil can be supported by the entire bottom 3, making it possible to provide a seedling pot in which the bottom 3 is less likely to fall out. Furthermore, if the relationship between the overlap angle α and the angle β of the apex 3b is within the above range, each tongue portion 4 is formed in the same shape, and the length a of one of the opposing side edges 4ba with the tip 5d as the vertex is equal to the length b of the other side edge 4bb, the polygon of the bottom surface 3 becomes a regular polygon, and the overall shape of each overlapping portion 5a, 5b becomes a radial shape with the tip 5d of the side overlapping portion 5b at each apex 3b, resulting in a seedling pot with a neat shape when viewed from the outside.

[0037] (Bottom 3 forming process) In the seedling raising pot, the side edges 4b of the tongue portions 4 are overlapped as shown in Figs. The imaginary line that bisects the angle γ between the bottom 4c of the tongue portion 4 (shown by a virtual line in FIG. 14) and one side 4ba of the side portion 4b of the tongue portion 4 is defined as a first imaginary line 6b, and the imaginary line that bisects the angle γ between the bottom 4c and the other side 4bb of the side portion 4b of the tongue portion 4 is defined as a second imaginary line 6a (see FIG. 14). A state in which one side 4ba of the side edge portion 4b of a tongue portion 4 is in a position that coincides with the second imaginary line 6a of the tongue portion 4 adjacent to that tongue portion 4, and the first imaginary line 6b of the tongue portion 4 is in a position that coincides with the other side 4bb of the side edge portion 4b of the tongue portion 4 adjacent to that tongue portion 4 (the tip 5d of the side edge overlapping portion 5b is the apex, and the overlapping angle α between one side 4ba of the side edge portion 4b of the tongue portion 4 and the other side 4bb of the side edge portion 4b of the tongue portion 4 adjacent to that tongue portion 4 is α=0.33 β), each side overlapping portion 5b is formed, with its tip 5d as an apex, and one side 4ba of the tongue portion 4 intersects with the other side 4bb of the tongue portion 4 adjacent to that tongue portion 4 at an overlapping angle α, and one side 4ba of each tongue portion 4 is overlapped with one side of the front or back of the other side 4bb of the tongue portion 4 adjacent to the respective tongue portion 4, and the tip portion 4a of each tongue portion 4 is welded at the axial overlapping portion 5a. Each side overlapping portion 5b may be formed in a state in which one side 4ba of a tongue portion 4 is located near the second imaginary line 6a of the tongue portion 4 adjacent to that tongue portion 4, and the first imaginary line 6b of a tongue portion 4 is located near the other side 4bb of the tongue portion 4 adjacent to that tongue portion 4 (in a state in which the tip 5d of the side overlapping portion 5b is the apex, and the overlapping angle α between one side 4ba of the side portion 4b of a tongue portion 4 and the other side 4bb of the side portion 4b of the tongue portion 4 adjacent to that tongue portion 4 satisfies 0.31×β ≦ α ≦ 0.35×β). Instead of the two virtual lines 6a and 6b, it is advisable to draw markers (for example, two marker lines per tongue portion 4) on the plane of the tongue portion 4 to easily grasp the overlapping position of the tongue portions 4. By forming the bottom 3 in this manner, it is possible to easily form the polygonal shape of the periphery 3a of the bottom 3. This makes it easy to form the seedling pot. When the imaginary lines 6a, 6b are replaced with the mark lines 6a, 6b, the polygonal shape of the periphery 3a of the bottom 3 of the seedling pot can be formed more smoothly than when the imaginary lines 6a, 6b are used.

[0038] (Process for forming notch 7 or slit 9) A fan-shaped peripheral surface portion 1 and a plurality of tongue portions 4 of the same shape are formed integrally at the lower end of the fan-shaped peripheral surface portion 1 from a single sheet (nonwoven fabric, paper, plastic material, biodegradable material, etc.). The linear bases 4c (shown by imaginary lines in FIG. 14) of the multiple tongue portions 4 are continuous at a position where the ends of the bases 4c of adjacent tongue portions 4 form the apex 3b. The boundary between the peripheral surface portion 1 and the linear bases 4c of each tongue portion 4 forms the polygonal periphery 3a when the bottom 3 is formed. At least one of the notch 7, additional slit 8, and slit 9 is formed in advance only at the middle position of each side of the peripheral edge 3a. At this time, the wide portion 7c of the notch 7, the peripheral edge additional slit 8c, and the horizontal slit 9a of the slit 9 are formed so as to be at the middle position of each side of the peripheral edge 3a. This makes it easier to bend the tongue portion 4 in the direction of the axis O when the bottom portion 3 is formed. The cutout 7 is preferably large enough so that the gravel 16 does not protrude from the cutout. In the fourth embodiment, a combination with the notched portion 7 of the first embodiment has been described, but the same can be said for the slit 9 of the third embodiment instead of the notched portion 7.

[0039] (Other Examples) Each configuration of the fourth embodiment can also be applied to the case where the notched portion 7 of the first embodiment or the second embodiment, or the slit 9 of the third embodiment is not formed. In any of the above-described embodiments, it is optional whether the perforations 1a are formed or not formed at the boundary between the bottom side 4c of the tongue portion 4 and the lower end of the peripheral surface portion 1. In these inventions, the material for forming the seedling pot is preferably a nonwoven fabric in consideration of drainage and breathability. When using a seedling pot, gravel 16 is placed in the pot, followed by the addition of soil. At this time, as shown in Figure 16, the weight of the gravel 16 and soil causes the periphery 3a of the bottom 3 to lower, causing the axial overlapping portion 5a to protrude relatively. This creates a downward gradient from the axial overlapping portion 5a to the periphery 3a. With this configuration, even if the seedling pot is not made of nonwoven fabric, the tip 5d of the side overlapping portion 5b, the notch 7, the slits 9, etc. can be used as drainage portions 14, as shown in Figure 17. Water 15 flows down the downward gradient and is drained from each drainage portion 14 arranged on the periphery 3a, making the seedling pot less susceptible to root rot. Next, in order to more actively encourage the elongated roots to extend outside the pot, the following configuration can be added to the configurations of the first to fourth embodiments. 18(A), a circular weld 10 is formed at the center of the axial overlapping portion 5a of the bottom 3, and a hole 17 having a diameter D2 smaller than the diameter D1 of the weld 10 is formed at the center of the weld 10. The tip ends 4a of the tongue portions 4 are joined to each other by an annular weld 10a that surrounds the outer periphery of the hole 17. The hole 17 penetrates the axial overlapping portion 5a of the bottom portion 3, as shown in FIG. 18(B). By forming holes 17 in the welded portion 10 of the axial overlapping portion 5a in this way, the extended roots can be more actively forced out of the pot. Also, by forming the annular welded portion 10a, the welded area is smaller than the welded portion 10 of the first to fourth embodiments. This annular welded portion 10a makes it easier to peel off the tongue portions 4 that form the bottom portion 3 by hand when potting up the plant. As a result, the seedling pot can be easily disassembled, and at that time, the extended roots can be pulled out from the hole 17 without getting caught, so that the potting work can be easily carried out. This hole 17 is formed by forming the welded portion 10 of the bottom portion 3, and then cutting off the inside of the annular welded portion 10a, leaving the annular welded portion 10a. With this configuration, the hole 17 can be easily formed in the shaft center overlapping portion 5a. The annular welded portion 10a can be formed not only in a circular shape as shown in FIG. 18, but also in a square shape (including a rectangle and a diamond shape) as shown in FIG. The shape of the holes 17 is preferably the same as that of the annular welded portion 10a, but may be different. It is sufficient that the holes 17 are smaller than the annular welded portion 10a. When sewing the axial center overlapping portion 5a, for example, it is sufficient to sew it in a circle with a diameter D1 centered on the axial center O, and then form a hole 17 with a diameter D2 smaller than the diameter D1. [Industrial Applicability]

[0040] INDUSTRIAL APPLICABILITY The present invention can be used as a seedling raising pot for raising seedlings of flowers, fruit trees, etc. [Explanation of symbols]

[0041] 1 Peripheral part 1a perforation 2 Opening 3 bottom 3a Periphery 3b top 4 Tongue part 4a Tip 4b Side part 4ba One side 4bb the other side 4c Bottom 5a Shaft overlapping part 5b Side overlap 5c Non-overlapping area 5d tip 6 Virtual Line

[0042] 7 Cutout 7a Peripheral cutout 7b Bottom notch 7c wide part 8 additional slits 8a Additional peripheral slit 8b Bottom additional slit 8c Additional slits around the periphery 9 Slit 9a Horizontal slit 9b Vertical slit 9c Diagonal slit

[0043] 10 Welded area 10a Annular weld 11 seedlings 12 roots 13 Cultivating soil 14 Drainage section 15 water 16 Gravel 17 holes 18 Hole edge slit O axis center α overlap angle β Angle of the top 3b a Length of one side 4ba b Length of the other side 4bb

Claims

1. A cylindrically formed peripheral portion (1), an opening (2) at the upper end side of the peripheral surface portion (1); a bottom portion (3) having a polygonal plane that closes the lower end side of the peripheral surface portion (1); The bottom portion (3) is made up of a plurality of tongue portions (4) formed in a mountain shape including a trapezoid, The tongue portion (4) has a tip portion (4a) that reaches the axis (O) of the bottom portion (3), side portions (4b) located on both sides in the width direction of the tip portion (4a), and a base portion (4c) that forms one side of the polygonal periphery (3a) of the bottom portion (3), The bottom portion (3) has an axial overlapping portion (5a) where the tip portions (4a) of the tongue portions (4) overlap around the axis (O), and a side overlapping portion (5b) where the side portions (4b) of adjacent tongue portions (4) overlap, In a seedling pot, the tip portions (4a) of the tongue portions (4) are fixed to each other at the axial overlapping portion (5a), and a plurality of the side overlapping portions (5b) are formed at intervals around the axial center (O), Each side overlap portion (5b) extends radially toward each apex (3b) of the peripheral edge (3a); The seedling pot is characterized in that a notch (7) is formed on at least one of the bottom (3) and the peripheral surface (1) at a position away from each top (3b) and only at the middle position of the peripheral edge (3a), with the peripheral edge (3a) as the base.

2. The seedling pot according to claim 1, The notch (7) has a peripheral notch (7a) extending from the base of the peripheral edge (3a) of the peripheral surface (1) toward the opening (2), and a bottom notch (7b) extending from the peripheral edge (3a) of the bottom (3) toward the axis (O), A seedling pot characterized in that an L-shaped notch (7) is formed by integrally notching a peripheral notch (7a) and a bottom notch (7b).

3. The seedling pot according to claim 1, The cutout portion (7) has an additional slit (8) formed continuously from its end, As an additional slit (8), a peripheral additional slit (8a) extending from the tip of the peripheral notch (7a) toward the opening (2); a bottom additional slit (8b) extending from the tip of the bottom notch portion (7b) toward the axis (O) and not reaching each overlapping portion (5a, 5b); This seedling pot is characterized in that at least one pair of peripheral additional slits (8c) is formed from both sides of the wide portion (7c) so as not to reach the top (3b).

4. A cylindrically formed peripheral portion (1), an opening (2) at the upper end side of the peripheral surface portion (1); a bottom portion (3) having a polygonal plane that closes the lower end side of the peripheral surface portion (1); The bottom portion (3) is made up of a plurality of tongue portions (4) formed in a mountain shape including a trapezoid, The tongue portion (4) has a tip portion (4a) that reaches the axis (O) of the bottom portion (3), side portions (4b) located on both sides in the width direction of the tip portion (4a), and a base portion (4c) that forms one side of the polygonal periphery (3a) of the bottom portion (3), The bottom portion (3) has an axial overlapping portion (5a) where the tip portions (4a) of the tongue portions (4) overlap around the axis (O), and a side overlapping portion (5b) where the side portions (4b) of adjacent tongue portions (4) overlap, In a seedling pot, the tip portions (4a) of the tongue portions (4) are fixed to each other at the axial overlapping portion (5a), and a plurality of the side overlapping portions (5b) are formed at intervals around the axial center (O), Each side overlap portion (5b) extends radially toward each apex (3b) of the peripheral edge (3a); The peripheral edge (3a) has slits (9) formed integrally with the peripheral surface portion (1) and the bottom portion (3) only at the intermediate position of the peripheral edge (3a) away from each top portion (3b), The slits (9) are formed in a cross shape or a cross shape in which a cross and an X having a horizontal slit (9a) and a vertical slit (9b) are combined at their intersections when the seedling pot is in an expanded state, A seedling pot characterized in that the horizontal slits (9a) are formed on the periphery (3a).

5. A cylindrically formed peripheral portion (1), an opening (2) at the upper end side of the peripheral surface portion (1); a bottom portion (3) having a polygonal plane that closes the lower end side of the peripheral surface portion (1); The bottom portion (3) is made up of a plurality of tongue portions (4) formed in a mountain shape including a trapezoid, The tongue portion (4) has a tip portion (4a) that reaches the axis (O) of the bottom portion (3), side portions (4b) located on both sides in the width direction of the tip portion (4a), and a base portion (4c) that forms one side of the polygonal periphery (3a) of the bottom portion (3), The bottom portion (3) has an axial overlapping portion (5a) where the tip portions (4a) of the tongue portions (4) overlap around the axis (O), and a side overlapping portion (5b) where the side portions (4b) of adjacent tongue portions (4) overlap, In a seedling pot, the tip portions (4a) of the tongue portions (4) are fixed to each other at the axial overlapping portion (5a), and a plurality of the side overlapping portions (5b) are formed at intervals around the axial center (O), Each side overlap portion (5b) extends radially toward each apex (3b) of the peripheral edge (3a); The tip (5d) of the side overlapping portion (5b) reaches each apex (3b) of the peripheral edge (3a), The side overlapping portion (5b) has its tip (5d) as a vertex, and one side (4ba) of the side portion (4b) of the tongue portion (4) intersects with the other side (4bb) of the side portion (4b) of the tongue portion (4) adjacent to that tongue portion (4) at an overlapping angle (α); When the angle formed by the apex (3b) of the polygon of the bottom (3) is defined as angle (β), The relationship between the overlap angle (α) and the angle (β) formed by the apex (3b) is as follows: ０．３１×β ≦ α ≦ ０．３５×β A seedling pot characterized by the above.

6. The seedling pot according to any one of claims 1 to 4, There are no perforations formed at the boundary between each tongue portion (4) and the lower end of the peripheral portion (1) through which roots can pass, The tip (5d) of the side overlapping portion (5b) reaches each apex (3b) of the peripheral edge (3a), The seedling pot is characterized in that each side overlapping portion (5b) has a gap in the overlapping direction of the tongue portions (4).

7. The seedling pot according to any one of claims 1 to 4, Each tongue portion (4) is formed in the same shape, and the polygonal periphery (3a) of the bottom portion (3) is formed in a regular polygon. A seedling pot characterized in that at least one of the notch portion (7), the additional slit (8) or the slit (9) is formed on each side of the regular polygonal periphery (3a) of the bottom (3).

8. The method for producing a seedling pot according to any one of claims 1 to 5, When the seedling pot is in an expanded state, a virtual line that bisects the angle γ between the bottom portion (4c) and one side (4ba) of the side portion (4b) of the tongue portion (4) is defined as a first virtual line (6b), and a virtual line that bisects the angle γ between the bottom portion (4c) and the other side (4bb) of the side portion (4b) of the tongue portion (4) is defined as a second virtual line (6a). Each side overlap portion (5b) is formed in a state in which one side edge (4ba) of a tongue portion (4) is located near or coincident with the second imaginary line (6a) of the tongue portion (4) adjacent to that tongue portion (4), and the first imaginary line (6b) of the tongue portion (4) is located near or coincident with the other side edge (4bb) of the tongue portion (4) adjacent to that tongue portion (4), Each side overlapping portion (5b) has its tip (5d) as a vertex, and one side (4ba) of the tongue portion (4) intersects with the other side (4bb) of the tongue portion (4) adjacent to that tongue portion (4) at an overlapping angle (α), One side edge (4ba) of each tongue portion (4) is overlapped on one side of the front or back of the other side edge (4bb) of the tongue portion (4) adjacent to the respective tongue portion (4), A method for manufacturing a seedling pot, comprising a step of fixing the tip (4a) of each tongue portion (4) at the axial overlap portion (5a).

Images