JP2015084655A - Plant growth culture medium and plant growth kit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide plant growth culture medium in which plants (for example, fruit vegetables, root vegetables and the like) can be grown efficiently in a limited space.SOLUTION: Plant growth culture medium 100 including plural kinds of artificial soil particles 50 includes: guide floors 2 which include first artificial soil particles 50a having water retention capability of more than a predetermined value and electric conductivity of less than a predetermined value, and which guide the extension direction of roots 21 of a plant 20; and a growth floor 3 which includes second artificial soil particles 50b having less water retention capability and higher electric conductivity than the first artificial soil particles 50a, and which promotes the growth of the roots 21 of the plant 20. The guide floors 2 are arranged locally on the surface side of the growth floor 3 in the state of being exposed.

Description

  The present invention relates to a plant growth medium containing a plurality of types of artificial soil particles, and a plant growth kit using the plant growth medium.

  In recent years, plant factories that grow plants such as vegetables in an environment where growth conditions are controlled are increasing. Until now, plant factories have mainly focused on hydroponic cultivation of leafy vegetables such as lettuce, but recently there has been a movement to try cultivation of plant vegetables and root vegetables that are not suitable for hydroponic cultivation in plant factories. .

  It is known that the root direction of a plant root is induced by an external stimulus, for example, a stimulus such as gravity, moisture, contact, etc., so-called gravity, moisture, contact, and the like. Among these, since gravity is the strongest stimulus for the growth of plant roots, the growth direction of plant roots generally extends in the direction in which gravity acts, that is, vertically downward. Therefore, in order to cultivate plants such as fruit vegetables and root vegetables, a soil environment in which the roots of the plants grow downward is required. However, the maintenance of the soil environment in the plant factory hinders the expansion of the plant cultivation range into the vertical space, which is a merit of the plant factory, for example, the cultivation of plants using multistage shelves. The plant cultivation efficiency in the plant factory will be reduced. Therefore, in order to cultivate plants (especially fruit vegetables and root vegetables) in a plant factory, it is possible to induce the elongation direction of plant roots in a desired direction, and so on. An artificial soil (plant growth medium) having a function is required.

  In the plant growth medium described in Patent Document 1, a plurality of gel culture media are juxtaposed around the gel culture medium to be seeded so as to spread outward in the same plane. As a result, the roots of the cultivated plants spread in the gel medium juxtaposed in a plane, and the height of the plants can be kept low while supporting self-supporting parts such as stems, leaves, and flowers.

JP 2011-250763 A

  However, since the plant growth medium of Patent Document 1 uses a gel medium with a small gap, the space for sufficient growth of plant roots and air permeability cannot be ensured, resulting in poor growth. There is a fear. In addition, there is a possibility that the gel medium collapses due to the elongation of the roots of the plant and cannot sufficiently support the plant.

  The present invention has been made in view of the above problems, and a plant growth medium that makes it possible to efficiently grow plants (for example, fruit vegetables and root vegetables) in a limited space, and the plants An object is to provide a plant growth kit using a growth medium.

The characteristic configuration of the plant growth medium according to the present invention for solving the above problems is as follows:
A plant growth medium containing a plurality of types of artificial soil particles,
An induced bed that includes first artificial soil particles having a water retention value equal to or greater than a predetermined value and an electrical conductivity equal to or less than a predetermined value;
A second artificial soil particle having smaller water retention and higher electrical conductivity than the first artificial soil particle, and a growth bed that promotes the growth of plant roots;
With
The induction floor is locally disposed in a state of being exposed on the surface side of the growth bed.

  According to the plant growth medium of this configuration, the water retained in the induction bed oozes out toward the growth bed to form a water content gradient (the water content decreases as the distance from the induction bed), and the water content Depending on the content, the fertilizer components dissolve from the second artificial soil particles to form a gradient of fertilizer content (the fertilizer content decreases as the distance from the induction floor increases). Due to the effect of this moisture content and fertilizer content gradient, the roots of the plant extend through the growth bed in the direction of the locally placed induction bed. Here, since the induction floor is locally arranged in a state exposed on the surface side of the growth bed, the roots of the plant extend toward the induction floor in a state close to the surface side of the plant growth medium. . Therefore, the root of the plant grows in a certain depth region where the induction floor exists, and the vertical space for growing the root of the plant can be reduced. As a result, the vertical space of the plant factory can be used effectively, and the cultivation efficiency of the plant can be improved. In addition, since the self-supporting part of the plant is supported by the whole plant growth medium, there is little risk of falling down even if the plant becomes a mature adult.

In the plant growth medium according to the present invention,
The water retention amount of the induction floor is 40 cc or more per 100 cc of the first artificial soil particle,
The water retention amount of the growth bed is preferably 20 cc or more and less than 40 cc per 100 cc of the second artificial soil particle.

  According to the artificial soil particles of this configuration, the water retention amount of the induction floor is 40 cc or more per 100 cc of the first artificial soil particle, and the water retention amount of the growth bed is 20 cc or more and less than 40 cc per 100 cc of the second artificial soil particle. Therefore, a moderate moisture content gradient is generated from the induction bed to the inside of the growth bed. As a result, plant roots can efficiently extend in the direction of the induction bed.

In the plant growth medium according to the present invention,
The induction bed preferably retains moisture for 24 hours or more in a range where the pF value is 2.3 or less.

  According to the plant growth medium of this configuration, the induction bed retains moisture for a period of 24 hours or longer within a pF value of 2.3 or less, and therefore retains moisture that can be used by plants, so-called easy-to-use water for a long time. Can do. This easy-to-use water is adsorbed gently on the artificial soil particles, so that the gradient of moisture content from the induction bed to the inside of the growth bed becomes clear, and as a result, the roots of the plant move from the growth bed to the induction bed. Can be reliably stretched.

In the plant growth medium according to the present invention,
The electrical conductivity of the induction floor is less than 1.5 mS / cm;
The growth bed preferably has an electrical conductivity of 1.5 mS / cm or more and 10.0 mS / cm or less.

  Since the induction bed is set to have high water retention, when the roots of the plant extend in the induction bed, it becomes difficult to absorb oxygen from the roots, and root rot may occur. According to the plant growth medium of this configuration, the electrical conductivity of the induction bed is less than 1.5 mS / cm, and the amount of fertilizer retained is set low. As a result, the root rot of the plant can be prevented. On the other hand, since the electrical conductivity of the growth bed is 1.5 mS / cm or more and 10.0 mS / cm or less, fertilizer is formed in the growth bed in accordance with the moisture content gradient generated from the induction bed to the inside of the growth bed. A content gradient is assured. Thereby, the root of a plant is efficiently extended from the growth bed toward the induction bed.

In the plant growth medium according to the present invention,
The growth bed preferably includes a breathable layer having a coarse porosity adjusted to 40% or more.

  According to the plant growth medium of this configuration, the growth bed includes a breathable layer whose coarse porosity is adjusted to 40% or more, so that the water is well drained and water does not easily accumulate in the growth bed. Therefore, a gradient of moisture content tends to occur from the induction bed toward the inside of the growth bed, and plant roots can efficiently extend from the growth bed toward the induction bed.

In the plant growth medium according to the present invention,
When cultivating a plant by sowing or cutting, it is preferable that the said induction floor is arrange | positioned in the area | region to sowing or cutting.

  According to the plant growth medium of this configuration, when a plant is cultivated from sowing or cutting, since the induction floor is arranged in the area to be seeded or cutting, sowing or cutting by the induction floor having high water retention Therefore, rooting can be promoted efficiently. As a result, plants such as fruit vegetables and root vegetables can be cultivated until seeding or cuttings become adults.

In the plant growth medium according to the present invention,
It is preferable that the guide floors are distributed as a plurality of guide beds.

  According to the plant growth medium of this configuration, when a plant is planted on one of the plurality of induction beds, the roots can be extended from the induction floor toward the other distributed distribution beds. Therefore, it becomes easy to extend the root of the plant in a desired direction, and the vertical space for growing the root of the plant can be reduced while reliably supporting the plant. As a result, the vertical space of the plant factory can be used efficiently, and the cultivation efficiency of plants such as fruit vegetables and root vegetables can be improved.

In the plant growth medium according to the present invention,
The induction floor is preferably configured to be removable from the growth bed.

  According to the plant growth medium of this configuration, since the induction bed is configured to be removable from the growth bed, the induction bed can be replaced according to the type of plant such as fruit vegetables and root vegetables to be cultivated. .

In the plant growth medium according to the present invention,
The first artificial soil particles include a fiber mass formed by collecting fibers,
The second artificial soil particles preferably include a porous body formed by granulating a plurality of fillers having pores.

  According to the plant growth medium of this configuration, the induced bed containing the first artificial soil particles has high water retention due to the fiber block, so that the root of the plant can be reliably guided and extended in the desired direction. it can. Since the growth bed containing the second artificial soil particles can support the fertilizer on the filler having pores, the fertilizer can be supplied to the elongated root. As a result, plants such as fruit vegetables and root vegetables can be reliably grown until they become adults.

The characteristic configuration of the plant breeding kit according to the present invention for solving the above problems is as follows:
The use of any one of the above plant growth media.

  According to the plant growth kit using the plant growth medium of this configuration, since any one of the above plant growth media is used, the roots of the plant can be induced and extended in a desired direction. The plant breeding kit of this configuration is particularly effective for improving the cultivation efficiency of plants such as fruit vegetables and root vegetables.

FIG. 1 is a cross-sectional view of a plant growth medium using a plurality of types of artificial soil particles. FIG. 2 is a perspective view showing an example of a plant growth medium in which a plurality of induction beds are arranged. FIG. 3 is a cross-sectional view showing another embodiment of a plant growth medium using a plurality of types of artificial soil particles. FIG. 4 is an explanatory diagram conceptually showing two types of artificial soil particles. FIG. 5 is a perspective view illustrating a plant growth kit using a plant growth medium.

  Hereinafter, an embodiment relating to a plant growth medium according to the present invention and a plant growth kit using the plant growth medium will be described with reference to FIGS. However, the present invention is not intended to be limited to the configurations described in the embodiments and drawings described below.

[Plant growth medium]
FIG. 1 is a cross-sectional view of a plant growth medium 100 using a plurality of types of artificial soil particles 50. The plant growth medium 100 in FIG. 1 (a) is composed of two types of artificial soil particles 50 (50a, 50b) having different water retention and fertilization properties. The plant growth medium 100 in FIG. 1 (b) is composed of three types of artificial soil particles 50 (50a, 50b ₁ , 50b ₂ ) having different water retention and fertilization properties. The water retention of the plant growth medium 100 can be changed by the material constituting the artificial soil particles 50. For example, when hydrophilic fibers are used as the material constituting the artificial soil particles 50, the water absorption of the artificial soil particles 50 increases, and the water retention of the plant growth medium 100 increases. In addition, the water retention of the plant growth medium 100 can be changed by changing the size of the artificial soil particles 50. A gap 1 is formed between the artificial soil particles 50, and moisture is retained in the gap 1. Therefore, the state of the gap 1 affects the moisture retention. For example, if the size of the gap 1 becomes too large, the force for holding moisture in the gap 1 is weakened, and the water retention capacity of the plant growth medium 100 is lowered. On the other hand, when the size of the gap 1 becomes too small, the force for holding moisture in the gap 1 becomes excessive, and the air permeability of the plant growth medium 100 is lowered. The size of the gap 1 is related to the size of the artificial soil particle 50. When the size of the artificial soil particle 50 is large, the size of the gap 1 formed between the artificial soil particles 50 is large, and when the size of the artificial soil particle 50 is small, the size of the gap 1 formed between the artificial soil particles 50. Becomes smaller. That is, by changing the size of the artificial soil particles 50, the water retention and air permeability of the plant growth medium 100 can be adjusted.

  The plant growth medium 100 of FIG. 1A is configured to provide an appropriate amount of water and fertilizer while ensuring the induction floor 2 for guiding the elongation direction of the root 21 of the plant 20 and the air permeability for the root 21 to grow. And a growth bed 3 to be supplied. The induction floor 2 is composed of first artificial soil particles 50a with high water retention, and the growth bed 3 is composed of second artificial soil particles 50b that retain appropriate amounts of water and fertilizer. The induction floor 2 of the plant growth medium 100 reduces the size of the first artificial soil particles 50a, thereby reducing the gaps 1 between the first artificial soil particles 50a and increasing the water retention capacity (water retention). The growth bed 3 of the plant growth medium 100 increases the air permeability by making the size of the second artificial soil particles 50b larger than the size of the first artificial soil particles 50a, and the fertilizer content of the second artificial soil particles 50b is the first. The fertilizer is held so as to be higher than the fertilizer content of the artificial soil particles 50a, thereby enhancing the fertilizer retention. Since the second artificial soil particles 50b used for the growth bed 3 are larger in size than the first artificial soil particles 50a used for the induction floor 2, the gap 1 between the second artificial soil particles 50b is a certain level or more. It becomes size and can secure the breathability in the ground. Furthermore, since the induction floor 2 has improved fertilizer retention, an appropriate amount of fertilizer can be supplied to the plant 20 as the plant 20 grows.

As shown in FIG. 1, the induction floor 2 is locally arranged in a state of being exposed on the surface side of the growth floor 3. Here, the induction floor 2 existing at the place where the plant 20 is planted is referred to as an induction floor 2a, and the other induction floor 2 is referred to as an induction floor 2b. The induction bed 2 is prepared to have higher water retention than the growth bed 3, and the growth bed 3 is further prepared to have higher air permeability than the induction bed 2. As a result, the moisture retained on the induction floor 2 oozes out from the induction floor 2 toward the growth floor 3, and the amount of water in the growth floor 3 in the region close to the induction floor 2 is large. A moisture content gradient is formed in which the amount is reduced. In addition, the second artificial soil particle 50b of the growth bed 3 holds more fertilizer than the first artificial soil particle 50a, and the fertilizer is dissolved in the water present in the growth bed 3. Therefore, the amount of fertilizer that dissolves in accordance with the amount of water present in the growth bed 3 is large in the region close to the induction floor 2 in the growth bed 3, and the amount of fertilizer that dissolves decreases as the distance from the induction floor 2 increases. Thus, a gradient is also formed for the fertilizer content in the growth bed 3. Due to the effect of the water content and fertilizer content gradient, the root 21 of the plant 20 to be cultivated extends in the direction of the induction floor 2b after leaving the induction floor 2a. Therefore, the root 21 of the plant 20 can be extended in a desired direction only by arranging the induction floor 2b at a desired location on the growth floor 3 where the root 21 of the plant 20 is desired to be extended. In FIG. 1, the induction floor 2b is locally arranged at a predetermined distance from the place 2a where the plant 20 is planted, and therefore exists at the place where the plant 20 is planted from the locally arranged guide floor 2b. The gradient of moisture content and fertilizer content is generated in the growth bed 3 toward the induction bed 2a. Therefore, the root 21 of the plant 20 extends from the induction floor 2a toward the induction floor 2b. The fertilizer content of the plant growth medium 100 is represented by electric conductivity (EC). When the fertilizer content (salt concentration) in the soil becomes high, electricity becomes easy to flow, so the electrical conductivity becomes high. Accordingly, the electrical conductivity (fertilizer content) represents the concentration of ionized fertilizer (eg, NH ₄ ⁺ , NO ₃ ⁻ ) in the soil, that is, the fertilizer dissolved in the soil.

  When the plant 20 is cultivated from sowing or cutting, as shown in FIG. 1, the induction floor 2a is arranged in a region where sowing or cutting is performed. Since the induction floor 2a has high water retention, rooting can be promoted efficiently from sowing or cutting. Since the growth floor 3 is arranged around the induction floor 2a on which the sowing or cutting has been performed, the root 21 extends to the growth floor 3 after rooting from the sowing or cutting, and a space for the root 21 to grow. Air permeability is ensured. Moreover, the induction floor 2 (2a, 2b) can also be comprised so that removal from the growth floor 3 is possible. Thereby, the plant 20 which has been cultivated can be removed simply by removing the induction floor 2 from the plant growth medium 100, and the plant growth medium 100 can be reused by attaching a new induction floor 2. become. The new induction floor 2 can be selected according to the types of plants such as fruit vegetables and root vegetables to be cultivated.

In FIG. 1B, a breathable layer 3 a having a breathability higher than that of the growth bed 3 is disposed below the growth bed 3. The second artificial soil particle 50b ₂ having a size larger than that of the second artificial soil particle 50b ₁ used for the growth bed 3 is used for the air-permeable layer 3a. Since the plant growth medium 100 includes the air permeable layer 3a, even if excessive water is present in the growth bed 3, water can be efficiently discharged, and the air permeability of the growth bed 3 is reliably ensured. be able to. Thereby, it becomes easy to produce the gradient of moisture content toward the inside of the growth bed 3 from the induction bed 2. Details of the structures of the first artificial soil particles 50a and the second artificial soil particles 50b will be described later.

FIG. 2 is a perspective view showing an example of the plant growth medium 100 in which a plurality of induction beds 2 are arranged. In the figure, the root 21 of the plant 20 is represented by a broken line.
In FIG. 2A, a plurality of guide floors 2 are distributed and arranged at a predetermined interval. The root 21 of the plant 20 extends in the direction of the guide floor 2b that is distributed from the guide floor 2a that exists at the place where the plant 20 is planted. Here, the induction floor 2 (2a, 2b) is prepared with a small gap 1 between the first artificial soil particles 50a and a small amount of fertilizer. Accordingly, the roots 21 extending from the induction floor 2a toward the induction floor 2b are prevented from entering deep inside the induction floor 2 and extend along the gradient of the moisture content and the fertilizer content of the growth bed 3. . Thereby, since it can suppress that the root 21 of the plant 20 spreads in the induction floor 2, the root rot by the oxygen shortage of the root 21 in the induction floor 2 can be prevented. In this embodiment, since the root 21 of the plant 20 extends from the guide floor 2a existing at the place where the plant 20 is planted toward the guide floor 2b arranged in a distributed manner, the guide floor 2 (2a, 2b) is constant. The root 21 expands in the depth region. Thereby, even if the plant 20 becomes a matured adult, the plant 20 can be supported by the whole plant growth medium 100. As a result, the vertical space conventionally required for cultivation of the plant 20 can be reduced. For example, in a plant factory cultivated on a multistage shelf, the plant growth medium 100 can be suitably used.
In FIG. 2B, the plurality of induction floors 2 are distributed and arranged at a predetermined interval in a certain direction. Also in this case, the root 21 of the plant 20 extends in the direction of the guide floor 2b arranged in a distributed manner from the guide floor 2a existing at the place where the plant 20 is planted. Therefore, in FIG.2 (b), the expansion | extension direction of the root 21 of the plant 20 can be aligned with a predetermined direction.

  The water retention amount of the induction floor 2 is set to be larger than the water retention amount of the growth floor 3. The water retention amount of the induction floor 2 is preferably 40 cc or more per 100 cc volume of the first artificial soil particles 50a. When the water retention amount of the induction floor 2 is less than 40 cc per 100 cc of the volume of the first artificial soil particle 50a, a good water content gradient is not formed from the induction floor 2 to the inside of the growth bed 3, and the root of the plant 20 21 may not be able to be guided. The water retention amount of the growth bed 3 is preferably 20 cc or more and less than 40 cc per 100 cc of the volume of the second artificial soil particle 50b. If the water retention amount of the growth bed 3 is less than 20 cc per 100 cc of the volume of the second artificial soil particle 50b, the water that can be used by the plant 20 is reduced, which may adversely affect the growth of the plant 20. In addition, when the water retention amount of the growth bed 3 is 40 cc or more per 100 cc of the volume of the second artificial soil particle 50b, a favorable water content gradient is not formed from the induction bed 2 to the inside of the growth bed 3, There is a possibility that the root 21 of the plant 20 cannot be induced. In addition, the air permeability of the growth bed 3 is lowered, it becomes difficult to absorb oxygen from the root 21 of the plant 20, and root rot may occur.

  The force with which the soil retains moisture is expressed as a pF value. The pF value is a common logarithm value of the suction pressure of the soil moisture expressed by the height of the water column, and is a value representing the degree of strength at which the moisture in the soil is attracted by the capillary force of the soil. The pF value of soil can be measured using a pF meter (tensiometer). When the pF value is 2.0, it corresponds to a pressure of 100 cm of water column. The pF value also represents the strength of soil and moisture adsorption. If the soil and moisture adsorption force is weak, the pF value becomes low, and the plant roots easily absorb moisture. On the other hand, if the adsorption power of soil and moisture is strong, the pF value becomes high, and a large force is required for the roots of plants to absorb moisture. When there is no air in the gaps in the soil, the state when all is filled with water has a pF value of 0, and the state where only water combined with the soil is present in the heat-dried soil at 100 ° C. The value is 7. The water in the soil that the plant can absorb from the roots is the water from the water remaining in the soil (pF1.7), usually 24 hours after rainfall or irrigation, to the initial wilting point (pF3.8) where the plant begins to wither. It is. In the case of general soil, the pF value at which plants can be cultivated, the range of so-called easy water is a pF value of 1.7 to 2.7. However, when the present inventors actually cultivated a plant, it became clear that when the pF value exceeds 2.3, the viability of the plant tends to decrease. Therefore, in the present invention, a pF value of 2.3 is used as the upper limit of the pF value of easy-to-use water. It is preferable that the pF value of the induction bed 2 of the plant growth medium 100 retains moisture for 24 hours or more in the range of the pF value of 2.3 or less. When the time during which the moisture in the range of the pF value of 2.3 or less can be maintained is less than 24 hours, the moisture that can be easily used by the plant, that is, the moisture that is gently adsorbed to the artificial soil particles 50a is reduced. There is a possibility that a good water content gradient is not formed from 2 to the inside of the growth bed 3 and the root 21 of the plant 20 cannot be extended in the direction of the induction bed 2.

  Since the induction floor 2 induces the elongation of the roots 21 of the plants 20, it is necessary to have high water retention. Therefore, it is preferable to prepare the gap 1 formed between the first artificial soil particles 50a in a certain range. The size of the first artificial soil particles 50a constituting the induction floor 2 is preferably 0.1 to 2.0 mm. If the size of the first artificial soil particle 50a is smaller than 0.1 mm, the retention capacity of the water in the induction floor 2 becomes too strong, so that moisture does not effectively ooze from the induction floor 2 to the growth floor 3, and the induction floor 2 There is a possibility that a favorable moisture content gradient is not formed from the inside toward the inside of the growth layer 2. As a result, there is a possibility that the extending direction of the root 21 of the plant 20 is not induced in a desired direction. On the other hand, if the size of the first artificial soil particle 50a is larger than 2.0 mm, sufficient water retention cannot be obtained, and therefore there is a possibility that a gradient of water content is not formed from the induction floor 2 toward the inside of the growth layer 2. is there. As a result, there is a possibility that the extending direction of the root 21 of the plant 20 is not induced in a desired direction.

  The growth bed 3 forms a gradient of moisture content and fertilizer content by moisture that oozes from the induction bed 2. In addition, an appropriate amount of fertilizer is also supplied to the plant 20 while ensuring a space for the root 21 to extend and air permeability in accordance with the elongation of the root 21 of the plant 20. Therefore, it is preferable to secure the gap 1 formed between the artificial soil particles 50 to a certain level or more. The size of the second artificial soil particles 50b constituting the growth bed 3 is preferably 2.0 to 10.0 mm. If the size of the second artificial soil particle 50b is smaller than 2.0 mm, the size of the gap 1 formed between the second artificial soil particles 50b becomes too small, and the drainage performance of the growth bed 3 decreases. As a result, there is a possibility that a favorable water content and fertilizer content gradient may not be formed from the induction floor 2 toward the inside of the growth layer 2. Moreover, the plant 20 becomes difficult to absorb oxygen from the root 21, and root rot may occur. On the other hand, if the size of the second artificial soil particle 50b is larger than 10.0 mm, the size of the gap 1 formed between the second artificial soil particles 50b becomes too large, and the drainage becomes excessive. As a result, there is a possibility that a favorable water content and fertilizer content gradient may not be formed from the induction floor 2 toward the inside of the growth layer 2. In addition, the plant 20 becomes difficult to absorb sufficient moisture and may die. In addition, the size of the artificial soil particle 50 can be measured using, for example, an optical microscope observation and an image processing method.

  The electrical conductivity of the plant growth medium 100 is set so that the electrical conductivity value of the growth bed 3 exceeds the electrical conductivity value of the induction bed 2. The electrical conductivity of the induction bed 2 of the plant growth medium 100 is preferably less than 1.5 mS / cm. Since the induction floor 2 has a function of inducing the root 21 of the plant 20, it is sufficient that a minimum amount of fertilizer is included. For example, when the electrical conductivity of the induction floor 2 is 1.5 mS / cm or more, the root 21 of the plant 20 spreads inside the highly water-retentive induction floor 2, making it difficult to absorb oxygen from the root 21 and causing root rot. There is a fear. Further, when the induction floor 2 is used as cuttings, etc., some fertilizer is required for cuttings. However, when the electrical conductivity of the induction floor 2 is 1.5 mS / cm or more, the plant 20 causes so-called fertilizer burns. There is a fear. The electrical conductivity of the growth bed 3 of the plant growth medium 100 is preferably 1.5 mS / cm or more and 10.0 mS / cm or less. If the electrical conductivity of the growth bed 3 is less than 1.5 mS / cm, a sufficient amount of fertilizer cannot be supplied to the plant 20, which may adversely affect the growth of the plant 20. On the other hand, even if the electrical conductivity of the growth bed 3 exceeds 10.0 mS / cm, the effect is not greatly improved compared to the amount of fertilizer added, which is economically disadvantageous. In addition, the plant 20 may cause fertilizer and burns. By setting the electrical conductivity of the induction bed 2 and the growth bed 3 of the plant growth medium 100 to the above range, the amount of fertilizer that is large in the area close to the induction floor 2 in the growth bed 3 and dissolves as the distance from the induction floor 2 increases. The fertilizer content gradient can be reduced. As a result, the root 21 of the plant 20 efficiently extends from the growth bed 3 toward the induction bed 2.

[Another embodiment]
FIG. 3 is a cross-sectional view showing another embodiment of the plant growth medium 100 using a plurality of types of artificial soil particles 50. The plant growth medium 100 of FIG. 3 is composed of two types of artificial soil particles 50 (50a, 50b) having different water retention and fertilization properties. The plant growth medium 100 includes an induction bed 2 that induces the direction of elongation of the root 21 of the plant 20, and a growth bed 3 that supplies appropriate amounts of moisture and fertilizer to the plant 20 while ensuring air permeability for the growth of the root 21. It consists of and. The induction floor 2 is composed of first artificial soil particles 50a with high water retention, and the growth bed 3 is composed of second artificial soil particles 50b that retain appropriate amounts of water and fertilizer.

  In this alternative embodiment, the induction floor 2 is partially exposed from the place where the plant 20 is planted in a direction in which the root 21 of the plant 20 is desired to be extended in a state of being exposed on the surface side of the growth floor 3. I am letting. Since the root 21 of the plant 20 requires a medium with high water retention immediately after rooting, the root 21 of the plant 20 extends in the direction in which the induction floor 2 is extended when the induction floor 2 is arranged. Thereby, the extension direction of the root 21 of the plant 20 can be induced. Specifically, when sowing or cutting is carried out on the surface side of the induction floor 2, the radicle of the plant 20 immediately after rooting extends toward the more moisture-rich side. In particular, in the case of sowing, since the seeds contain nutrients and the necessity for absorbing the nutrients is low, the roots 21 extend in a direction with much moisture. In the plant growth medium 100 of the present embodiment, as shown in FIG. 3, the root 21 is guided in the direction in which the induction floor 2 is extended from the place where the plant 20 is sown or cut, and the plant 21 extends in the direction. I am letting. When the plant 20 grows, the root 21 extends to the growth floor 3 arranged around the induction floor 2, and a space for the root 21 to grow and air permeability are ensured. In this different embodiment, the induction floor 2 is arranged only at the planting place of the plant 20, but another induction floor 2 can be arranged at a predetermined interval in the extending direction of the root 21. Thereby, it becomes possible to extend the root 21 in a desired direction more efficiently.

  As described above, the first artificial soil particles 50a used in the plant growth medium 100 of the present invention are prepared so as to have high water retention, and the second artificial soil particles 50b have a space and ventilation for the root 21 to grow. It is adjusted so as to supply an appropriate amount of fertilizer to the plant 20 while ensuring the property. Therefore, the first artificial soil particles 50a and the second artificial soil particles 50b having such different characteristics will be described with reference to FIG.

[First artificial soil particles]
FIG. 4 is an explanatory diagram schematically showing two types of artificial soil particles 50. The first artificial soil particles 50a shown in FIG. The fiber lump 10 is a collection of a plurality of fibers 11. Gaps 12 are formed between the fibers 11 constituting the fiber lump 10. The fiber lump 10 can retain moisture in the gap 12. Therefore, the state of the gap 12 of the fiber lump 10 is related to the water retention of the fiber lump 10. The state of the gap 12 can be adjusted by changing the amount (density) of the fibers 11 used to form the fiber lump 10, the type, thickness, length, and the like of the fibers 11. In addition, the size of the fiber 11 is preferably 5 to 100 μm in thickness and preferably 0.3 to 10 mm in length. Moreover, it is also possible to use the short fiber cut | disconnected previously as the fiber 11, and the length of a short fiber is preferable about 0.2-0.5 mm in this case. By using the fiber block 10 as the first artificial soil particles 50a, the water retention capacity of the induction bed 2 of the plant growth medium 100 can be further increased, and the elongation direction of the root 21 can be efficiently induced. Moreover, when performing sowing or cutting, it can root efficiently from sowing or cutting.

  Since the fiber lump 10 is configured so that moisture can be retained therein, it is preferable to use a hydrophilic fiber as the fiber 11. As the type of the fiber 11, natural fiber or synthetic fiber is appropriately selected. Preferable hydrophilic fibers include, for example, natural fibers such as cotton, wool, rayon, and cellulose fibers, and synthetic fibers include, for example, vinylon, urethane, nylon, and acetate. Of these fibers, cotton, cellulose fiber, and vinylon are more preferable. As the fiber 11, it is possible to use a mixture of natural fiber and synthetic fiber.

  The fiber lump 10 is formed by a known granulation method. For example, cellulose fiber, cotton, vinylon, etc. are aligned with a carding device or the like, cut to a length of about 3 to 10 mm, and the cut fiber 11 is subjected to rolling granulation, fluidized bed granulation, stirring granulation, The fiber lump 10 is formed by granulating into granules by a method such as compression granulation or extrusion granulation. The fiber lump 10 can be efficiently formed by mixing a binder such as resin or glue with the fibers 11 during granulation. As the binder, either an organic binder or an inorganic binder can be used. Organic binders include, for example, synthetic resin binders such as polyolefin binders, polyvinyl alcohol binders, polyurethane binders, polyvinyl acetate binders, polysaccharides such as starch, carrageenan, xanthan gum, gellan gum, alginic acid, and animal properties such as glue. Examples include natural product-based binders such as proteins. Examples of the inorganic binder include silicate binders such as water glass, phosphate binders such as aluminum phosphate, borate binders such as aluminum borate, and hydraulic binders such as cement. An organic binder and an inorganic binder can be used in combination of two or more. When fibers 11 that are easily entangled (for example, bent fibers) are used, the fibers 11 are easily entangled with each other simply by granulation. In this case, the fiber lump 10 is not particularly required without using a binder. Can be formed.

  In granulating the fiber lump 10, it is also possible to use short fibers or fiber powder as the fibers 11. In this case, the resin emulsion is added in small amounts as a binder and granulated while stirring the short fibers and fiber powder with a stirring and mixing granulator. Thereby, the short fiber and fiber powder which form the fiber lump 10 are fixed in part, and the strong fiber lump 10 can be formed.

  A coating layer may be formed on the outer surface of the fiber lump 10. By providing the coating layer, rapid drying of the fiber mass can be prevented, and moisture absorption / release characteristics can be controlled. The coating layer is a film having ultrafine pores through which water molecules can pass. Or it can also be set as the permeable membrane which water | moisture content permeates from one side and can move to the other side. A coating layer is formed in the outer surface part of the fiber lump 10 with the following method, for example. First, the granulated fiber lump is transferred to a container, and water about half the volume (occupied volume) of the fiber lump 10 is added, so that water is soaked into the gaps 12 of the fiber lump 10. Next, a resin emulsion of 1/3 to 1/2 of the volume of the fiber lump 10 is added to the fiber lump 10 soaked with water. It is also possible to mix plant hormones, plant growth regulators and the like in the resin emulsion. Thereby, the root 21 of the plant 20 can be induced more efficiently. Next, the resin emulsion is impregnated from the outer surface portion of the fiber lump 10 while rolling so that the resin emulsion uniformly adheres to the outer surface portion of the fiber lump 10. At this time, since the water has soaked into the central portion of the fiber lump 10, the resin emulsion remains near the outer surface of the fiber lump 10. Thereafter, the fiber lump 10 to which the resin emulsion is adhered is dried in an oven, the resin is then melted, and the resin is fused to the fibers 11 near the outer surface of the fiber lump 10 to form a resin film as a coating layer. To do. Thereby, the 1st artificial soil particle 50a which coat | covered the outer surface part of the fiber lump 10 with the coating layer is producible.

  The material of the coating layer is preferably insoluble in water and hardly oxidized, and examples thereof include a resin material. Examples of such a resin material include polyolefin resins such as polyethylene and polypropylene, vinyl chloride resins such as polyvinyl chloride and polyvinylidene chloride, polyester resins such as polyethylene terephthalate, and styrene resins such as polystyrene. Of these, polyethylene is preferred. Instead of resin materials, use polymer gelling agents such as polyethylene glycol and acrylamide, natural polysaccharide gelling agents such as alginate and carrageenan, rubber coating agents such as natural rubber and silicone rubber, etc. Is also possible.

  An ion exchange ability can also be imparted to the fiber lump 10 and the coating layer. By providing ion exchange capacity to at least one of the fiber lump and the coating layer, the fertilizer component necessary for rooting of the cuttings can be supported on the first artificial soil particles 50a. Rooting can be promoted. The details of the material to which the ion exchange ability is imparted will be described in the section of the second artificial soil particle.

[Second artificial soil particle]
The second artificial soil particle 50b shown in FIG. 4B includes a porous body in which a plurality of fillers 13 are aggregated to form a granular shape. It is not essential that the plurality of fillers 13 are in contact with each other. If the relative positional relationship within a certain range is maintained in one particle via a binder or the like, the plurality of fillers 13 are aggregated. It can be considered that it has become granular.

  The filler 13 constituting the porous body of the second artificial soil particle 50b has a large number of pores 14 from the surface to the inside. The pore 14 includes various forms. For example, when the filler 13 is the zeolite shown in FIG. 4B, the voids present in the crystal structure of the zeolite are the pores 14. Moreover, when the filler 13 is a hydrotalcite (not shown), the interlayer existing in the layer structure of the hydrotalcite is the pore 14. That is, in the present invention, the “pore” means a void portion, an interlayer portion, a space portion and the like existing in the structure of the filler 13, and these are not limited to the “pore shape”.

  The size of the pores 14 of the filler 13 is on the order of sub-nm to sub-μm. For example, the size of the pores 14 can be set to about 0.2 to 800 nm, but when the filler 13 is zeolite shown in FIG. 4B, the size (diameter) of voids present in the crystal structure of the zeolite. Is about 0.3 to 1.3 nm. When the filler 13 is hydrotalcite, the size (distance) between layers existing in the layer structure of the hydrotalcite is about 0.3 to 3.0 nm. In addition, an organic porous material can also be used as the filler 13, and the pore diameter in that case is about 0.1 to 0.8 μm. The size of the pores 14 of the filler 13 is optimal using a gas adsorption method, a mercury intrusion method, a small-angle X-ray scattering method, an image processing method, or a combination of these methods, depending on the state of the object to be measured. Measured by the method.

  Between the plurality of fillers 13, communication holes 15 in the order of sub μm to sub mm are formed that can retain moisture. Around the communication hole 15, pores 14 are dispersedly arranged. Since moisture is mainly retained in the communication hole 15, the second artificial soil particle 50 b can have a certain water retention property. The size of the communication holes 15 (the average value of the distances between the fillers 13) can vary depending on the type, composition, and granulation conditions of the fillers 13 and binders, but is on the order of sub-μm to sub-mm. For example, the size of the communication hole 3 can be set to about 0.1 to 500 μm, but when the filler 13 is zeolite shown in FIG. 4B, the size of the communication hole 15 is 0.1 to 20 μm. is there. The size of the communication hole 15 is measured by an optimum method using a gas adsorption method, a mercury intrusion method, a small-angle X-ray scattering method, an image processing method, or a combination of these methods according to the state of the measurement target. can do.

  As the filler 13, it is preferable to use a material in which the pores 14 have an ion exchange capacity so that the second artificial soil particles 50b have a sufficient fertilizer. In this case, as the material imparted with ion exchange ability, a material imparted with cation exchange ability, a material imparted with anion exchange ability, or a mixture of both can be used. In addition, a porous material having no ion exchange ability (for example, a polymer foam, a glass foam, etc.) is prepared separately, and a material in which the ion exchange ability is imparted to the pores 14 of the porous material is provided. It is also possible to use the filler 13 by introducing it by press-fitting or impregnation. Examples of the material imparted with the cation exchange ability include cation exchange minerals, humus, and cation exchange resins. Examples of the material imparted with the anion exchange ability include anion exchange minerals and anion exchange resins.

  Examples of cation exchange minerals include smectite minerals such as montmorillonite, bentonite, beidellite, hectorite, saponite, and stevensite, mica minerals, vermiculite, zeolite, and humus. Examples of the cation exchange resin include a weak acid cation exchange resin and a strong acid cation exchange resin. Of these, zeolite or bentonite is preferable. The cation exchange mineral and the cation exchange resin can be used in combination of two or more. The cation exchange capacity of the cation exchange mineral and the cation exchange resin is set to 10 to 700 meq / 100 g, preferably 20 to 700 meq / 100 g, and more preferably 30 to 700 meq / 100 g. When the cation exchange capacity is less than 10 meq / 100 g, the nutrients cannot be taken in sufficiently, and the taken-up nutrients may be lost early due to irrigation or the like. On the other hand, even if the fertilizer is excessively increased so that the cation exchange capacity exceeds 700 meq / 100 g, the effect is not greatly improved and it is not economical.

  Anion-exchange minerals include, for example, natural layered double hydroxides that have double hydroxides as the main skeleton such as hydrotalcite, manaceite, pyroaulite, sjoglenite, patina, synthetic hydrotalcite and hydrotalcite-like Materials, clay minerals such as allophane, imogolite, kaolin and the like. Examples of the anion exchange resin include weakly basic anion exchange resins and strong basic anion exchange resins. Of these, hydrotalcite is preferred. An anion exchange mineral and an anion exchange resin can be used in combination of two or more. The anion exchange capacity of the anion exchange mineral and the anion exchange resin is set to 5 to 500 meq / 100 g, preferably 20 to 500 meq / 100 g, and more preferably 30 to 500 meq / 100 g. When the anion exchange capacity is less than 5 meq / 100 g, the nutrients cannot be taken in sufficiently, and the taken-up nutrients may be lost early due to irrigation or the like. On the other hand, even if the fertilizer is excessively increased so that the anion exchange capacity exceeds 500 meq / 100 g, the effect is not greatly improved and it is not economical.

  When the filler 13 is an inorganic natural mineral such as zeolite or hydrotalcite, the gelling of the polymer gelling agent is performed in order to collect a plurality of fillers 13 to form a granular material (second artificial soil particle 50b). Reaction is preferably used. Examples of the gelation reaction of the polymer gelling agent include a gelation reaction of alginate, propylene glycol alginate, gellan gum, glucomannan, pectin, or carboxymethylcellulose (CMC) and a polyvalent metal ion, carrageenan, agar, Examples thereof include a gelation reaction by a double helix structuring reaction of polysaccharides such as xanthan gum, locust bean gum, and tara gum. Among these, the gelation reaction between an alginate and a polyvalent metal ion will be described. Sodium alginate, which is one of alginates, is a neutral salt in which the carboxyl group of alginic acid is bonded to Na ions. Alginic acid is not required in water, but sodium alginate is water soluble. When an aqueous sodium alginate solution is added to an aqueous solution of polyvalent metal ions (for example, Ca ions), ionic crosslinking occurs between the molecules of sodium alginate and gelation occurs. In the case of this embodiment, the gelation reaction can be performed by the following steps. First, an alginate aqueous solution is prepared by dissolving alginate in water, a filler 13 is added to the alginate aqueous solution, and this is sufficiently stirred to form a mixed solution in which the filler 13 is dispersed in the alginate aqueous solution. . Next, the mixed solution is dropped into the polyvalent metal ion aqueous solution, and the alginate contained in the mixed solution is gelled in a granular form. Thereafter, the gelled particles are collected, washed with water, and sufficiently dried. Thereby, the 2nd artificial soil particle 50b as a granular material which the filler 13 disperse | distributed in the alginic acid gel formed from an alginate and a polyvalent metal ion is obtained.

  Examples of alginates that can be used in the gelation reaction include sodium alginate, potassium alginate, and ammonium alginate. These alginate can be used in combination of two or more. The concentration of the alginate aqueous solution is 0.1 to 5% by weight, preferably 0.2 to 5% by weight, and more preferably 0.2 to 3% by weight. When the concentration of the alginate aqueous solution is less than 0.1% by weight, the gelation reaction hardly occurs. When the concentration exceeds 5% by weight, the viscosity of the alginate aqueous solution becomes too large. In addition, it is difficult to drop the mixed solution into the aqueous solution of the polyvalent metal ion.

  The polyvalent metal ion aqueous solution to which the alginate aqueous solution is dropped may be a divalent or higher metal ion aqueous solution that reacts with the alginate and causes gelation. Examples of such polyvalent metal ion aqueous solutions include aqueous chloride solutions of polyvalent metals such as calcium chloride, barium chloride, strontium chloride, nickel chloride, aluminum chloride, iron chloride, cobalt chloride, calcium nitrate, barium nitrate, aluminum nitrate. Nitrate aqueous solutions of polyvalent metals such as iron nitrate, copper nitrate and cobalt nitrate, lactate aqueous solutions of polyvalent metals such as calcium lactate, barium lactate, aluminum lactate and zinc lactate, aluminum sulfate, zinc sulfate, cobalt sulfate etc. An aqueous solution of a valent metal sulfate is mentioned. These polyvalent metal ion aqueous solutions can be used in combination of two or more. The concentration of the polyvalent metal ion aqueous solution is 1 to 20% by weight, preferably 2 to 15% by weight, and more preferably 3 to 10% by weight. When the concentration of the polyvalent metal ion aqueous solution is less than 1% by weight, the gelation reaction hardly occurs. When the concentration exceeds 20% by weight, it takes time to dissolve the metal salt and excessive materials are used. Not economical.

  The granulation of the filler 13 for forming the second artificial soil particles 50b can be performed by a granulation method using a binder in addition to the gelation reaction described above. For example, a filler or a solvent is added to the filler 13 and mixed, the mixture is introduced into a granulator, rolling granulation, fluidized bed granulation, agitation granulation, compression granulation, extrusion granulation, extrusion granulation, crushing It can carry out by well-known granulation methods, such as granulation, melt granulation, and spray granulation. The obtained granulated body is dried and classified as necessary, and the second artificial soil particle 50b is completed. Further, a binder is added to the filler 13 and, if necessary, a solvent or the like is added and kneaded. The resulting mixture is dried and made into a block shape. It is also possible to obtain a granular material. The granular material can be used as the second artificial soil particle 50b as it is, but it is preferable to adjust to a desired size by sieving.

  As the binder, either an organic binder or an inorganic binder can be used. Organic binders include, for example, synthetic resin binders such as polyolefin binders, polyvinyl alcohol binders, polyurethane binders, polyvinyl acetate binders, polysaccharides such as starch, carrageenan, xanthan gum, gellan gum, alginic acid, and animal properties such as glue. Examples include natural product-based binders such as proteins. Examples of the inorganic binder include silicate binders such as water glass, phosphate binders such as aluminum phosphate, borate binders such as aluminum borate, and hydraulic binders such as cement. An organic binder and an inorganic binder can be used in combination of two or more.

  When the filler 13 is an organic porous material, the formation of the second artificial soil particles 50b may be performed by the same method as the granulation method of the filler 13 described above using a binder. The second artificial soil particles 50b are formed by heating to a temperature equal to or higher than the melting point of the organic porous material (polymer material, etc.) constituting the material 13 and thermally fusing the surfaces of the plurality of fillers 13 together. It is also possible to do. In this case, a granular material in which a plurality of fillers 13 are gathered can be obtained without using a binder. As such an organic porous material, for example, an organic polymer foam obtained by foaming an organic polymer material such as polyethylene, polypropylene, polyurethane, polyvinyl alcohol, and cellulose, and the powder of the organic polymer material is heated and melted. An organic polymer porous body having an open cell structure is exemplified.

  In addition, although not shown in figure, it is also possible to provide the coating layer similar to the 1st artificial soil particle 50a in the outer surface part of the porous body of the 2nd artificial soil particle 50b. By providing the covering layer, it is possible to more precisely control the moisture absorption / release characteristics of the second artificial soil particles 50b.

  The second artificial soil particle 50b can be used as the first artificial soil particle 50a by appropriately changing the size and water absorption of the second artificial soil particle 50b. When the second artificial soil particle 50b is used as the first artificial soil particle 50a, the size of the second artificial soil particle 50b is preferably adjusted to 0.1 to 1.0 mm. Thereby, moisture can be efficiently retained in the gap 1 formed between the artificial soil particles 50.

[Plant breeding kit]
FIG. 5 is a perspective view illustrating a plant growth kit 200 using the plant growth medium of the present invention. As shown in FIG. 5, the plant growth kit 200 of the present embodiment is configured such that a plant growth medium is packaged using a packaging film or the like to form a package 30, and the package 30 can be used as a container. doing. In the upper part of the package 30, an insertion port 31 is formed in which not only the plant 20 but also seeds and cuttings can be planted. The insertion opening 31 is provided with a peelable opening piece 32. Thereby, the preservability of the plant breeding kit 200 can be improved. Further, when using the plant growing kit 200, the plant 20 is replanted by peeling the unsealed piece 32 from the package 30 and opening the insertion port 31 to expose the induction floor 2 of the plant growing medium 100. Sowing, cutting, etc. can be performed easily.

  The guide floor 2 is detachably attached to the insertion port 31, and the guide floor 2 for guiding the extending direction of the root 21 of the plant 20 is also arranged in a portion indicated by a broken line. The induction floor 2 is fixed with a binder and can be removed. As a manufacturing method of the plant breeding kit 200, for example, the second artificial soil particles 50b are spread inside the bag-shaped package 30, and the induction floor 2 fixed at a place where the root 21 of the plant 20 is to be extended is disposed. . Next, the second artificial soil particles 50 b are spread around the induction floor 2 so that the upper surface of the induction floor 2 is exposed on the surface side of the plant growth medium 100, thereby forming the growth floor 3. Finally, a hole is formed in the upper surface of the package 30 to form the insertion port 31, and the opening piece 32 is adhered to the insertion port 31, thereby completing the plant growing kit 200. In the plant growing kit 200 of the present invention, since the induction floor 2 is removable, when the cultivation of the plant 20 is completed, the induction floor 2 attached to the insertion port 31 is removed and replaced with a new induction floor 2. Can do. Moreover, since the artificial soil particle 50b used for the growth bed 3 has fertilizer, the fertilizer component is made into the artificial soil particle 50 by immersing the plant growing kit 200 of the present invention in a fertilizer solution or the like. It can be easily carried. That is, the plant growing kit 200 of the present invention can be reused by replacing the induction floor 2 of the insertion port 31 and carrying the fertilizer component again.

  A drainage hole (not shown) for drainage may be provided in the lower part of the package 30, and the drainage hole may be covered with a water-soluble film. When irrigation is started in the plant growing kit 200, the water-soluble film dissolves, so that excess water supplied from the insertion port 31 can be efficiently discharged from the drain hole, and air permeability of the plant growing kit 200 can be ensured. Moreover, it is preferable to use a waterproof film for the packaging film. By using a waterproof film, water irrigated from the insertion port 31 can be prevented from leaking outside from the side surface of the package 30 or the like.

  The artificial soil particles and plant growth medium of the present invention can be used for plant cultivation performed in a plant factory or the like, but as other uses, a soil culture medium for horticulture, a soil culture medium for greening, a molded soil medium, a soil improvement It can also be used for agents.

2 induction bed 3 growth bed 10 fiber lump 11 fiber 13 filler 14 pore 50 artificial soil particle 50a first artificial soil particle 50b (50b ₁ , 50b ₂ ) second artificial soil particle 100 plant growth medium 200 plant growth kit

Claims (10)

A plant growth medium containing a plurality of types of artificial soil particles,
An induced bed that includes first artificial soil particles having a water retention value equal to or greater than a predetermined value and an electrical conductivity equal to or less than a predetermined value;
A second artificial soil particle having smaller water retention and higher electrical conductivity than the first artificial soil particle, and a growth bed that promotes the growth of plant roots;
With
The induction bed is a plant growth medium that is locally disposed in a state exposed on the surface side of the growth bed. The water retention amount of the induction floor is 40 cc or more per 100 cc of the first artificial soil particle,
The plant growth medium according to claim 1, wherein the water retention amount of the growth bed is 20 cc or more and less than 40 cc per 100 cc of the second artificial soil particles.   The plant growth medium according to claim 1 or 2, wherein the induction bed retains moisture for 24 hours or more within a pF value of 2.3 or less. The electrical conductivity of the induction floor is less than 1.5 mS / cm;
The plant growth medium according to any one of claims 1 to 3, wherein the electrical conductivity of the growth bed is 1.5 mS / cm or more and 10.0 mS / cm or less.   The plant growth medium according to any one of claims 1 to 4, wherein the growth bed includes a breathable layer having a coarse porosity adjusted to 40% or more.   The plant growth medium according to any one of claims 1 to 5, wherein when the plant is cultivated by sowing or cutting, the induction floor is disposed in a region to be seeded or cutting.   The plant growth medium according to any one of claims 1 to 6, wherein the induction beds are distributed as a plurality of induction beds.   The plant growth medium according to any one of claims 1 to 7, wherein the induction bed is configured to be removable from the growth bed. The first artificial soil particles include a fiber mass formed by collecting fibers,
The plant growth medium according to any one of claims 1 to 8, wherein the second artificial soil particle includes a porous body formed by granulating a plurality of fillers having pores.   A plant growth kit using the plant growth medium according to any one of claims 1 to 9.

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