JP7366937B2 - Plant cultivation method and plant cultivation device - Google Patents

Description

The present invention relates to a method for cultivating plants such as tomatoes and a plant cultivating apparatus.

Tomato cultivation methods range from soil cultivation, in which seedlings are prepared in hotbeds and planted in open ground, to hydroponics, which allows production like a plant factory; for example, a hydroponic method has been proposed as hydroponics.

As this hydroponic cultivation method, Patent Document 1 discloses that approximately 250 ml of culture medium ( A technique is disclosed in which a nutrient solution is supplied to each culture medium in which tomato seedlings are planted in which soil, coconut shell, rock wool, etc.) are placed.

In the technique described in Patent Document 1, since conventional culture media (soil, coconut shell, rock wool, etc.) have relatively good water retention, the nutrient solution is irrigated 10 to 20% more than the amount of water required by the plants. Since excess liquid is prone to breeding bacteria, it was common practice to dispose of it as waste liquid. Also, since it is believed that slightly acidic soil is better for plant growth, the pH of the irrigation solution was adjusted to be slightly acidic.

Japanese Patent Application Publication No. 2007-306849

However, in the technique described in Patent Document 1, the excess liquid of the irrigation nutrient solution is prone to breeding of various bacteria, so it has to be disposed of as waste liquid, making it difficult to reduce the cost of cultivating plants.

An object of the present invention is to provide a method for cultivating plants and a plant cultivating apparatus that can reduce costs for cultivating plants.

In the method for cultivating plants according to the first aspect of the present invention, a medium is spread inside a container, plants are rooted in the medium, liquid fertilizer is soaked in a substance that makes it difficult for bacteria to propagate, and after soaking in the substance, The liquid fertilizer is supplied to the medium.
Preferably, the method for cultivating a plant according to claim 1 uses a tomato as the plant.

The method for cultivating plants according to the invention according to claim 2 provides a method for cultivating plants by spreading a medium inside a container, rooting the plants in the medium, soaking liquid fertilizer in a substance that makes it difficult for bacteria to propagate, and after soaking in the substance. The liquid fertilizer is supplied to the medium.

The method for cultivating plants according to the invention according to claim 3 is that a medium is spread over a horizontally placed belt-shaped gutter, plants are rooted in the medium at regular intervals, irrigation tubes are placed above the medium, and corals are grown. Liquid fertilizer soaked in sand and gravel and stored in a nutrient solution circulation tank is supplied to the medium through the irrigation tube, and the surplus liquid fertilizer is passed through the filter cloth lined inside the gutter and fed to the medium through the irrigation tube. The liquid fertilizer is poured into a drainage groove formed in the gutter, and the liquid fertilizer flowing into the drainage groove is returned from the gutter to the nutrient solution circulation tank.

The method for cultivating plants according to the invention described in claim 4 is the method for cultivating plants according to claim 3, in which the nutrient solution circulation is controlled by a decrease in water content indicated by a moisture meter installed in the culture medium or by an instruction from a timer. The liquid fertilizer returned to the tank is reused by supplying it to the culture medium through the irrigation tube.

In the plant cultivation device according to the invention as set forth in claim 5, a medium is spread over a horizontally placed belt-shaped gutter, plants are rooted in the medium at regular intervals, and an irrigation tube is placed above the medium, and a coral Liquid fertilizer soaked in sand and gravel and stored in a nutrient solution circulation tank is supplied to the medium through the irrigation tube, and the surplus liquid fertilizer is passed through the filter cloth lined inside the gutter and fed to the medium through the irrigation tube. A plant cultivation device that drains liquid fertilizer into a drainage groove formed in a gutter and returns liquid fertilizer flowing into the drainage groove from an end of the gutter to the nutrient solution circulation tank, the device comprising: the nutrient solution circulation tank and coral gravel. tank, a liquid fertilizer adjustment tank, a first raw material liquid tank that stores a first raw material liquid, a second raw material liquid tank that stores a second raw material liquid, a liquid fertilizer mixing pump, a liquid fertilizer transfer pump, and an irrigation pump. and a level sensor that detects the level of liquid fertilizer in the nutrient solution circulation tank, and the coral gravel tank is filled with the coral gravel, and the nutrient solution circulation tank is operated together with the nutrient solution circulation tank. By circulating the liquid fertilizer, the liquid fertilizer is immersed in the coral gravel, and when a certain amount of the liquid fertilizer in the nutrient solution circulation tank is consumed, the nutrient solution device removes the liquid fertilizer from the liquid fertilizer adjustment tank according to an instruction from the level sensor. A liquid fertilizer transfer pump supplies an appropriate amount of fertilizer liquid to the coral gravel tank, and when the water level in the liquid fertilizer adjustment tank decreases, water is supplied to the liquid fertilizer adjustment tank to a predetermined position, and the liquid fertilizer in the liquid fertilizer adjustment tank is properly adjusted. In order to achieve the EC concentration, the first raw material liquid and the second raw material liquid are mixed using the liquid fertilizer mixing pump, and the liquid fertilizer stored in the liquid fertilizer adjustment tank is supplied with nutrients until it reaches the appropriate EC concentration. This is for liquid control.

The plant cultivation device according to the invention according to claim 6 is the plant cultivation device according to claim 5, further comprising a flow rate sensor that detects the flow rate of the liquid fertilizer flowing into the irrigation tube, and which is installed in the nutrient solution device. The control device controls the nutrient solution and displays the amount of liquid fertilizer supplied from the nutrient solution circulation tank to the culture medium based on the detection result of the flow rate sensor.

The plant cultivation method and plant cultivation apparatus according to the present invention make it possible to reduce costs associated with plant cultivation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an overview of a method for cultivating plants according to a first embodiment of the present invention. FIG. 2 is a perspective view showing a gutter and a filter cloth used in the plant cultivation method according to the first embodiment of the present invention. It is an explanatory view showing the whole facility using the plant cultivation device concerning the 2nd embodiment of the present invention. It is a block diagram of the plant cultivation device concerning the 2nd embodiment of the present invention. It is a 1st sectional view showing a cultivation bed and an installation base of a plant cultivation device concerning a 2nd embodiment of the present invention. It is a 2nd sectional view showing a cultivation bed and an installation base of a plant cultivation device concerning a 2nd embodiment of the present invention. It is a block diagram of a plant cultivation device concerning a 3rd embodiment of the present invention.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described using FIGS. 1 and 2.

<Configuration of the first embodiment>
FIGS. 1 and 2 relate to a second embodiment of the present invention, in which FIG. 1 is an explanatory diagram showing an overview of a method for cultivating plants, and FIG. 2 is a perspective view showing a gutter and a filter cloth.

In FIG. 1, the method for cultivating plants according to the first embodiment of the present invention is to spread a medium 3 inside a container (gutter 2) constituting a plant cultivation device 1, and plant (tomato 10) in the medium 3. The liquid fertilizer 4 is soaked in the coral gravel 13, and the liquid fertilizer 4 soaked in the coral gravel 13 is supplied to the culture medium 3.

To explain in more detail, the method for cultivating the plants shown in FIG. A irrigation tube 5 is arranged on the top of the culture medium 3, and the liquid fertilizer 4 soaked in the coral gravel 13 and stored in the nutrient solution circulation tank 6 is supplied to the culture medium 3 through the irrigation tube 5, and the liquid fertilizer 4 becomes surplus due to the supply of liquid. The liquid fertilizer 4 is poured into a drainage groove 8 formed in the gutter 2 through a filter cloth 7 lined inside the gutter 2, and the liquid fertilizer 4 flowing into the drainage groove 8 is passed from the end of the gutter 2 to a drainage pipe. Drain through 9.

Hereinafter, the plant cultivation device 1 will be explained in detail.
The plant cultivation device 1 includes a gutter 2, a culture medium 3, a liquid fertilizer 4, an irrigation tube 5, a nutrient solution circulation tank 6, a filter cloth 7, a drainage pipe 9, a liquid fertilizer adjustment tank 11, a coral gravel tank 12, a coral gravel 13, and a liquid fertilizer. It includes a passage 14, the liquid fertilizer transfer pumps 15 and 16, an irrigation pump 17, timers 18, 19 and 20, and pipes 21 and 22.

The liquid fertilizer adjustment tank 11 stores liquid fertilizer 4a in which liquid A (first raw material liquid) from the liquid tank A and liquid B from the liquid tank B (second raw material liquid tank) are injected and mixed. It has become.

Coral gravel 13 is packed into the coral gravel tank 12 to a height of about 80% from the bottom.

The liquid fertilizer transfer pump 15 transfers the liquid fertilizer 4a stored in the liquid fertilizer adjustment tank 11 to the coral gravel tank 12 via the pipe 21 according to instructions from the timer 18.

The nutrient solution circulation tank 6 is capable of liquid communication with the coral gravel tank 12 via a liquid path 14, and the solution 4b from the coral gravel tank 12 flows therein. Further, since the liquid path 14 is provided with a filter, the coral gravel 13 in the coral gravel tank 12 will not move to the nutrient solution circulation tank 6.

The liquid fertilizer transfer pump 16 circulates the liquid fertilizer 4 stored in the nutrient solution circulation tank 6 to the coral gravel tank 12 via the pipe 22 according to instructions from the timer 19 .

The irrigation pump 17 pumps the liquid fertilizer 4 stored in the nutrient solution circulation tank 6 (including the liquid fertilizer 4b returned from the liquid path 14 to the nutrient solution circulation tank 6) through the irrigation tube 5 according to instructions from the timer 20. The medium 3 is supplied with liquid.

Further, the upper side of the medium 3 and the irrigation tube 5 are covered with a light-shielding sheet (light-shielding sheet 76 in FIG. 5) in which holes are formed that pass through the stems of the tomatoes 10.

Hereinafter, the gutter 2 and the filter cloth 7 will be explained in detail using FIG. 2.
In FIG. 2, the gutter 2 is formed by molding Styrofoam into the shape of a belt-shaped container with an open top.

The filter cloth 7 attached to the inside of the gutter 2 is made by stacking a hydroponic black polyplastic sheet 23, a nonwoven fabric 24, a plastic net 25, and a nonwoven fabric 26 in order from the bottom. The hydroponic black polyplastic sheet 23, the nonwoven fabric 24, and the nonwoven fabric 26 are formed to cover the entire upper side of the gutter 2. The plastic net 25 is formed to have the same size as the inner bottom surface of the gutter 2.

To summarize the first embodiment of the present invention, the method for cultivating plants is to spread a medium 3 inside a container (gutter 2), root a plant (tomato 10) in the medium, and use liquid fertilizer to prevent bacteria. The liquid fertilizer 4 is soaked in a material (coral gravel 13) that is difficult to propagate, and the liquid fertilizer 4 after soaking in the material is supplied to the medium 3.

<Actions and effects of the first embodiment>
However, with the combination of rock wool and liquid fertilizer that is commonly used as a conventional culture medium, the culture medium needs to be replaced every year, which is expensive as industrial waste.

With the combination of coconut shell medium and liquid fertilizer that has become popular as a medium in recent years, the medium needs to be replaced every 1 to 2 years, as the coconut shell medium is organic and changes over time due to bacterial growth.

Conventional high-sugar content tomato cultivation uses as little liquid fertilizer (water) as possible to reduce the water absorbed by the fruit and increase the sugar content, resulting in less fruit production.

The coral gravel 13 used in the first embodiment of the present invention is alkaline and does not change over time, making it difficult for bacteria to grow, so there is no need to replace it.

In addition, the liquid fertilizer 4 that has been soaked in coral gravel 13 has the property of making it difficult for bacteria to propagate, making it possible to extend the useful life of the medium when cultivating high-sugar tomatoes. In addition, with liquid fertilizer 4 after soaking in coral gravel 13, productivity can be improved because there is no need to impose extreme restrictions on irrigation.

Furthermore, in the method for cultivating plants according to the first embodiment, the liquid fertilizer 4 is not circulated, so it is possible to suppress the propagation of various bacteria.
However, this does not mean to exclude recycling, and recycling is also possible.
Even in that case, there is no need for equipment to sterilize the drain fluid, as it makes it difficult for bacteria to propagate.

In addition, the liquid fertilizer 4 used in the first embodiment of the present invention after being immersed in the coral gravel 13 contains abundantly many types (70 types) of essential minerals such as calcium and magnesium, so during growth. It is absorbed by tomatoes as a trace element, producing tomatoes with extremely high sugar content (8 to 12 degrees sugar content), making it possible to produce high-sugar tomatoes with high efficiency, which are in high demand in the market.

In addition, the above effects can be obtained while using conventional media such as rock wool.

In addition, since the amount of coral gravel 13 used only needs to be packed into the coral gravel tank 12, the increase in cost due to the use of coral gravel can be sufficiently suppressed.

Therefore, according to the method for cultivating plants according to the first embodiment of the present invention, it is possible to reduce the cost of cultivating plants (tomatoes).

[Second embodiment]
A second embodiment of the present invention will be described below using FIGS. 3 to 6.

<Configuration of second embodiment>
3 to 6 relate to a second embodiment of the present invention, in which FIG. 3 is an explanatory diagram showing the entire facility using a plant cultivation device, FIG. 4 is a block diagram of the plant cultivation device, and FIG. 5 is a diagram of the plant cultivation device. A first sectional view showing the tagger and the surrounding area of the cultivation device, and FIG. 6 is a second sectional view showing the tagger and the surrounding area of the plant cultivation device.

In FIG. 3, a tomato cultivation facility (plant) 30 has first to third cultivation buildings 31, 32, and 33 arranged in three rows.

The first cultivation building 31 is composed of one plant cultivation device 34. The plant cultivation device 34 includes one nutrient solution device 41, a plurality of gutters 2, an irrigation tube 5, a filter cloth 7, a drainage pipe 9, and a plurality of types of culture media 3a, 3b, 3c, and 3d shown in FIG. (See Figure 4).
Note that although this example describes a variety of examples, it is common to use multiple types of one type of culture medium instead of multiple types.

In FIG. 3, the second cultivation building 32 is comprised of one plant cultivation device 35 and a collection and shipping room 36. The plant cultivation device 35 includes one nutrient solution device 41, a plurality of gutters 2, an irrigation tube 5, a filter cloth 7, a drainage pipe 9, and a plurality of types of culture media 3a, 3b, 3c, and 3d shown in FIG. (See Figure 4).

In FIG. 3, the third cultivation building 33 is composed of one plant cultivation device 37. The plant cultivation device 37 includes a plurality of gutters 2, irrigation tubes 5, filter cloths 7, and drain pipes 9 shown in FIG. 1, and a plurality of types of culture media 3a, 3b, 3c, and 3d (see FIG. 4). ing.

In FIG. 3, the plant cultivation devices 34, 35, and 37 spread a medium (medium 3a, medium 3b, medium 3c, or medium 3d shown in FIG. 4) on a horizontally placed belt-shaped gutter 2, and plant plants in the medium. The irrigation tubes 5 (see FIG. 4) are placed on the top of the medium, and the liquid fertilizer 4 (see FIG. 4) stored in the nutrient solution circulation tank 51 (see FIG. 4) is fed to the irrigation tubes. Liquid fertilizer 4 is supplied to the culture medium through the liquid fertilizer 5, and the excess liquid fertilizer 4 is passed through the filter cloth 7 (see FIG. 5) attached to the inside of the gutter 2, and then passed through the drainage groove formed in the gutter 2. 8 (see FIG. 5), and the liquid fertilizer 4 flowing into the drain groove 8 is drained from the end of the gutter 2 through a drain pipe.

The plant cultivation device 34 will be described in detail below.
In FIG. 4, cultivation beds 42, 43, 44, and 45 of the plant cultivation device 34 are a combination of the gutter 2 and filter cloth 7 shown in FIG.

The cultivation bed 42 is covered with a rock wool culture medium 3a according to the variety of the plant (tomato 10a) to be cultivated. The cultivation bed 43 is covered with a medium 3b made of coconut shells according to the variety of the plant (tomato 10b) to be cultivated. The cultivation bed 44 is covered with a medium 3c made of inorganic sand and gravel according to the variety of the plant (tomato 10c) to be cultivated. The cultivation bed 45 is covered with a medium 3d made of a mixture of rock wool, coconut shell, etc., depending on the variety of the plant to be cultivated (tomato 10d).

In FIG. 4, the nutrient solution device 41 includes a nutrient solution circulation tank 51, a solution A tank (first material solution tank) 52 that stores solution A (first material solution), and a solution B (second material solution). ), a liquid fertilizer adjustment tank 54, a coral gravel tank 55, a liquid fertilizer mixing pump 56, liquid fertilizer transfer pumps 57 and 58, an irrigation pump 59, and a control valve. 60, a level sensor 61 that detects the level of the liquid fertilizer 4 in the liquid fertilizer adjustment tank 54, an EC sensor (fertilizer concentration sensor) 62, a level sensor 63 that detects the level of the liquid fertilizer 4 in the nutrient solution circulation tank 51, Flow rate sensors 64, 65, 66, 67 that detect the flow rate of the liquid fertilizer 4 flowing into the irrigation tube 5, and display devices 68, 69, 70, 71 that display the detection results of the flow rate sensors 64, 65, 66, 67, respectively. and a control panel 100.

Here, the difference between the second embodiment and the first embodiment is that, as shown in FIG. 4, an EC sensor 62 is provided in the liquid fertilizer adjustment tank 54, and the liquid fertilizer 4a in the liquid fertilizer adjustment tank 54 is adjusted to an appropriate EC concentration. A level sensor 61 is provided to detect the level of the liquid fertilizer 4a in the liquid fertilizer adjustment tank 54, and a level sensor 61 is provided to detect the level of the liquid fertilizer 4a in the liquid fertilizer adjustment tank 54. A level sensor 63 is provided to detect the level of water, and the irrigation pump 59 is controlled.

Coral gravel 13 is packed into the coral gravel tank 55 to a height of about 90% from the bottom.

The nutrient solution circulation tank 51 is capable of liquid communication with the coral gravel tank 55 via a liquid path 64, and the solution 4b from the coral gravel tank 55 flows therein. Further, since a filter is provided in the liquid path 64, the coral gravel 13 in the coral gravel tank 55 does not move to the nutrient solution circulation tank 51.

When a certain amount of liquid fertilizer 4 in the nutrient solution circulation tank 51 is consumed, the nutrient solution device 41 transfers the fertilizer from the liquid fertilizer adjustment tank 54 to the liquid fertilizer transfer pump 57 according to instructions from the level sensor 63 and control from the control panel 100. , an appropriate amount of fertilizer liquid 4a is supplied to the coral gravel tank 55. The fertilizer solution 4a supplied to the coral gravel tank 55 is immersed in the coral gravel 13, and flows into the nutrient solution circulation tank 51 via the liquid path 64 as the fertilizer solution 4b. Thereby, the liquid fertilizer 4 in the nutrient solution circulation tank 51 is maintained at an appropriate amount.

Further, the control panel 100 of the nutrient solution device 41 supplies fresh water to the liquid fertilizer adjustment tank 54 according to instructions from the level sensor 61 and control of the control valve 60 by the control panel 100 when the water level of the liquid fertilizer adjustment tank 54 decreases. In order to supply the liquid fertilizer 4 in the liquid fertilizer adjustment tank 54 to a predetermined position and make the liquid fertilizer 4 in the liquid fertilizer adjustment tank 54 have an appropriate EC concentration, the liquid fertilizer mixing pump 56 is used to supply the liquid fertilizer A (the first (raw material liquid) and the B liquid (second raw material liquid) are mixed and supplied until the liquid fertilizer 4a stored in the liquid fertilizer adjustment tank 54 reaches an appropriate EC concentration.

The liquid fertilizer transfer pump 58 circulates the liquid fertilizer 4 stored in the nutrient solution circulation tank 51 to the coral gravel tank 55 via a pipe at predetermined time intervals according to instructions from the control panel 100.

The irrigation pump 59 supplies the liquid fertilizer 4 from the nutrient solution circulation tank 51 to the medium 3a, 3b, 3c, and 3d of the cultivation beds 42, 43, 44, and 45 through the irrigation tube 5 according to instructions from the control panel 100. do.

The plant cultivation device 34 controls the nutrient solution using a control device (control panel 100) installed in the nutrient solution device 41, and transfers the nutrient solution from the nutrient solution circulation tank 51 to the culture media 3a, 3b, 3c, and 3d. The amount of liquid fertilizer 4 supplied is displayed on display devices 68, 69, 70, and 71, respectively, based on the detection results of the flow rate sensors 64, 65, 66, and 67, respectively.

As shown in FIG. 5, the cultivation bed 42 of the plant cultivation device 34 is placed on an installation stand 80.
The installation stand 80 includes a plate-shaped top plate 81 and a plurality of legs 82 and 83 that support the top plate 81.

The legs 82 and 83 are extendable and retractable. When the legs 82 and 83 shown in FIG. The top plate 81 and the cultivation bed 42 are in the lowest state.

As shown in FIG. 6, when the legs 82 and 83 are at their longest length (upper limit bed height), the width of the area S surrounded by the top plate 81, legs 82 and 83, and the ground is larger than the diameter of the hot air duct 90. The height of the region S is approximately 1.5 times the diameter of the hot air duct 90, and the width of the region S is kept slightly longer than the diameter of the hot air duct 90. 42 is the highest state.

By adjusting the area S in this way, the temperature of the cultivation bed 42 can be optimized.

Here, the cultivation beds 43, 44, and 45 shown in FIG. 4 have the same structure as the cultivation bed 42, except that the type of the medium is different.

The cultivation device 35 of the second cultivation building 32 differs from the cultivation device 34 of the first cultivation building 31 only in the overall size, and the rest of the structure is similar to the cultivation device 34.
The cultivation device 37 of the third cultivation building 33 is similar to the cultivation device 34 of the cultivation building 31.

<Actions and effects of the second embodiment>
According to the plant cultivation devices 34, 35, and 37 according to the second embodiment of the present invention, by supplying the liquid fertilizer 4 soaked in the coral gravel 13 to the medium 3a, 3b, 3c, and 3d, The same effects as in the first embodiment can be obtained, and it is possible to reduce the cost of cultivating plants (tomatoes).

[Third embodiment]
A third embodiment of the present invention will be described below using FIG. 7.

<Configuration of third embodiment>
FIG. 7 is a block diagram of a plant cultivation apparatus according to a third embodiment of the present invention.

The plant cultivation device 134 of the third embodiment supplies the liquid fertilizer 4 flowing into the drain groove 8 (see FIG. 1) of a horizontally placed belt-shaped gutter 46 from the end of the gutter 46 to the nutrient solution of the solution device 141. It is returned to the circulation tank 51. The culture medium 3c of the cultivation device 134 uses only inorganic sand and gravel.

In addition, the cultivation device 134 feeds the liquid fertilizer 4 returned to the nutrient solution circulation tank 51 to the culture medium via the irrigation tube 5 in response to a decrease in the water content indicated by the moisture meter 72 installed in the culture medium 3c or an instruction from a timer. Reuse by supplying liquid to 3c. The configuration other than these is the same as the second embodiment.

To summarize such a configuration, the method for cultivating plants according to the third embodiment is to spread a medium 3c in a horizontally placed belt-shaped gutter 46, root plants in the medium 3c at regular intervals, A irrigation tube 5 is arranged above the culture medium 3c, and the liquid fertilizer soaked in the coral gravel 13 and stored in the nutrient solution circulation tank 51 is supplied to the culture medium 3c through the irrigation tube 5, and the surplus is removed by the supply of liquid. The liquid fertilizer is poured into the drain groove 8 (see FIG. 2) formed in the gutter 46 through the filter cloth 7 (see FIG. 2) attached to the inside of the gutter 46, and the liquid fertilizer flowing into the drain groove 8 is 4 is returned to the nutrient solution circulation tank 51 from the end of the gutter 46.

<Actions and effects of the third embodiment>
According to the plant cultivation device 134 according to the third embodiment of the present invention, the same effects as in the second embodiment can be obtained, and the liquid fertilizer 4 flowing into the drain groove 8 of the gutter 46 is transferred to the nutrient solution circulation tank 51. By returning the fertilizer to the factory, it becomes possible to recycle the liquid fertilizer 4, and it becomes possible to suppress the amount of fresh water, liquid A, and liquid B used, and it becomes possible to reduce the cost of cultivating plants.

The structure, system, program, materials, connection of each member, scientific substances, etc. of the present invention can be variously changed without changing the gist of the present invention.

The material can also be freely selected from metal, plastic, FRP, wood, concrete, etc.

For example, it is possible to combine two or more members into one, or conversely, it is also possible to configure one member from two or more other members and connect them.

Further, the first to third embodiments described above are merely three of the currently best or close to it.

In addition, control may be controlled by a higher-level control section, or may be controlled by a more terminal control section.

Furthermore, the order of control can be changed as appropriate as long as it has a predetermined effect.
Furthermore, in the first to third embodiments, coral gravel was used as a substance to soak the liquid fertilizer 4 in order to make it difficult for bacteria to propagate, but scallop shells were used as a substance to soak the liquid fertilizer. Various materials can be used, such as crushed oyster shells, crushed limestone gravel, etc.
Furthermore, it may be an artificially prepared solution that is at least alkaline and more preferably mineral-rich. This is because it is thought that even such an artificially produced product can exhibit the same effect.
Currently, the appropriate alkalinity for the present invention is about pH 8 to 9. In addition, although it is preferable to have mineral components, we believe that they are not essential.

The following versions of the culture medium are also possible depending on the case.
For example, it is possible to use a medium that mainly uses coral. In the present invention, "mainly" means that it is the largest proportion among other constituents. However, we currently believe that the more coral there is, the better.
Other ingredients may include sand, pumice, gravel, etc.
It is more preferable that other components have alkaline properties.
Other ingredients may be shells (such as scallops). In some cases, only the shell may be used. Furthermore, we believe that it is possible to make the liquid fertilizer 4 chemically alkaline.
Similarly, the coral gravel layer 55 only needs to be made mainly of coral. In the present invention, "mainly" means that it is the largest proportion among other constituents. However, we currently believe that the more coral there is, the better.
Other ingredients may include sand, pumice, gravel, etc.
It is more preferable that other components have alkaline properties.
Other ingredients may be shells (such as scallops). In some cases, only the shell may be used. Furthermore, we believe that it is possible to make the liquid fertilizer 4 chemically alkaline.

Although the embodiment has been described in which the liquid fertilizer 4 flowing through the gutter 2 is removed from the end of the gutter 2, it is also possible to provide a discharge port for sequentially discharging it from the middle. In that case, there is an advantage that there is no slope, and the slope may be gentle. This is particularly effective when the gutter 2 becomes long.
Further, it is preferable to observe the flow rate of the irrigation pump 59 and measure how much water is being used.
Similarly, it is preferable to monitor the flow rates of the liquid fertilizer transfer pumps 57, 58.

<Definition, etc.>
Plants to be cultivated in the present invention include, in addition to tomatoes, various vegetables and fruits such as mangoes, bananas, melons, paprika, eggplants, cucumbers, and strawberries. Further, as tomato varieties other than cherry tomatoes, the present invention can be applied to Fruit Ruby, Sicilian Rouge, Momotaro, etc. In addition to vegetables and fruits, the present invention can also be applied to plants such as grains, which should have a high sugar content.

1... Plant cultivation device 2... Gutter 3... Medium 4... Liquid fertilizer 5... Irrigation tube 6... Nutrient circulation tank 7... Filter cloth 10... Tomato 13... Coral gravel 55... Coral gravel tank

Claims (1)

Spread the medium inside the container,
rooting a plant in the medium;
A method for cultivating plants, in which the liquid fertilizer is soaked outside the medium in a substance that makes it alkaline, which makes it difficult for bacteria to propagate, and the liquid fertilizer is supplied to the medium after being immersed in the substance to become alkaline.

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