JP2005253472A - Cultivation method and cultivation installation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an installation capable of smoothly and easily carrying out water management and fertilizer management without requiring a large amount of water, and suitable for the cultivation of an aquatic vegetable and a terrestrial vegetable; and to achieve a cultivation technique suitable for the cultivation. <P>SOLUTION: The cultivation installation in a layered shape is formed by mixing sand, soil and water in a water-stored state in an enclosure 1 in which the water can be stored, and leaving the resultant mixture to precipitate the sand faster by the difference in the specific gravities, and to allow the layer of the soil to accumulate thereon. The operations of feeding the water to a prescribed water level at the lower side of the surface of the soil layer in the enclosure, leaving them for a prescribed time, draining the water therefrom, and feeding the water to the prescribed water level again are repeated when cultivating the plant by forming the soil layer having 3-20 cm thickness on the sand layer having 5-30 cm thickness. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a method for cultivating vegetables, in particular, a method for cultivating water-based vegetables such as watercress and wasabi and land-based leafy vegetables such as green onions and spinach. However, it can also be applied to the cultivation of plants other than vegetables.

Of the vegetables we Japanese eat every day, green onions and spinach are terrestrial vegetables that are grown in the field. On the other hand, water-based vegetables such as watercress, ensai (called unchee in Okinawa) and wasabi are suitable for cultivation in paddy fields.

Watercress has recently been cultivated in paddy fields, but it has been cultivated only to a limited extent, mainly using river edges and springs. Because the cultivation technique has not been established, the yield is small, so the watercress always maintains high price stability, making it an expensive special vegetable that is not easily available. As a result, it is actually used only for meat dishes and fish dishes in restaurants.
51-20943

Watercress are highly nutritious and delicious, so they can be shipped at a price as low as spinach, which has been said to be the king of green and yellow vegetables. desired.

To achieve this, it is necessary to reduce and stabilize the price by enabling year-round cultivation.

As a cultivation feature of watercress, as long as there is an environment suitable for cultivation, advanced technology is not necessary, and anyone can cultivate easily. In addition, almost no fertilizer is required, and there is no need for cultivation. However, since a large amount of water and fresh water are required, mass cultivation is not possible.

Therefore, it takes time and labor for water supply and watering, and the labor cost for that is also increased. In the case of terrestrial plants such as spinach, if the water supply and fertilizer can be managed smoothly, they can be supplied to the market at a low price and can be cultivated year-round.

The technical problem of the present invention pays attention to such a problem, and can smoothly and easily manage water and fertilizer without requiring a large amount of water, for cultivation of plants such as water-based vegetables and land vegetables. To realize suitable facilities and cultivation techniques.

The technical problem of the present invention is solved by the following means. According to claim 1, in an enclosure where water can be stored, the sand, soil and water are agitated in a state where water is stored, and then left to stand, sand is first precipitated due to the difference in specific gravity, and a layer of soil is formed thereon. It is a method for forming a layer of a cultivation facility, wherein a layer of soil having a thickness of 3 to 20 cm is provided on a layer of sand having a thickness of 5 to 30 cm by depositing.

Thus, according to the method of stirring the sand, soil and water in a state where water is accumulated, the sand is first precipitated due to the difference in specific gravity, and the soil layer is deposited thereon, so that the thickness is 5 to 30 cm. It is possible to easily provide a soil layer having a thickness of 3 to 20 cm on the sand layer. Therefore, after the sand layer is laid uniformly and horizontally, it is not necessary to perform an advanced man-made operation such as laying the soil layer uniformly and horizontally on the sand layer. . In addition, although the layer thickness of a sand layer is suitable about 9-11 cm, depending on a plant, about 5-30 cm thickness is accept | permitted. Moreover, a soil layer is accept | permitted to the range of about 3-20 cm thickness depending on a plant.

A second aspect of the present invention is the method for forming a layer of a cultivation facility according to the first aspect, characterized in that the process of plowing and leaving in a state where water is accumulated as described above is performed about once a year. In this way, once a year, when plowing and leaving in a state where water is stored as described above, sand and soil are washed away, so that harmful microorganisms can be eliminated or killed. Can do.

According to a third aspect of the present invention, after a plant is cultivated by providing a soil layer on the sand layer as described above, water is supplied into the enclosure to a predetermined water level below the surface of the soil layer. The method of repeating the operation of leaving for a predetermined time, then draining, and then supplying water to the predetermined water level again, or allowing the water to constantly flow under the sand layer. It is the cultivation method of Claim 2. After draining, the interval until the next water supply is arbitrarily set according to the situation. This cultivation method is suitable for cultivating terrestrial plants such as spinach.

In this way, a soil layer is provided on the sand layer, the plant is cultivated, water is supplied to a predetermined water level, left for a predetermined time, then drained, and then supplied again to a predetermined water level to supply water. By exchanging everything, it is possible to reliably wash at least the sand layer, so that problems such as organic decay do not occur. Since sand is well drained, all sand can be drained in a relatively short time.

In addition, since new water containing oxygen is supplied, sufficient oxygen can be supplied to the roots of the plant. Unlike sand layer cultivation, the water in the enclosure is not allowed to flow away, but is left to stand for a long time, so that it consumes less water, is economical, and it is easy to secure a water source.

Since the water level is supplied to a predetermined water level below the surface of the soil layer, the soil surface is submerged and the fertilizer component on the soil surface does not flow out. Operation of water supply and drainage into the enclosure can be easily realized by automation and remote operation, and labor cost can be reduced by labor saving. In addition, the method of always allowing water to flow under the sand layer is also possible.

The fourth aspect of the present invention is to stir the sand, the soil and the water in a state where the water is stored in an enclosure in which the water is stored, and then let the sand settle first due to the difference in specific gravity, and deposit a soil layer thereon. In the plant cultivation facility in which a layer of 3 to 20 cm thick soil is provided on a layer of 5 to 30 cm thick sand,
Cultivation characterized in that a water supply port and a drain port are provided in the enclosure so that at least the water level in the sand layer can be managed, and the drain port is disposed at the bottom of the sand layer or at a position lower than the sand layer. It is a facility. By this facility, the cultivation method as in claims 1 to 3 is performed.

In this way, the sand, the soil and the water are mixed together and left to stand, and the sand is first precipitated due to the difference in specific gravity, and the soil layer is deposited on the sand layer. In the plant cultivation facility provided with a 3-20 cm thick soil layer, the water supply port and the drain port are provided in the enclosure so that at least the water level in the sand layer can be managed. Water management such as controlling the water level in the sand layer by adjusting the amount of water supply and drainage by adjusting the opening and closing of the drain outlet, the opening and closing amount, the adjustment of the overflow height, etc. becomes possible. In addition, since the drain outlet is arranged at the bottom of the sand layer or at a position lower than the sand layer, by opening this drain outlet, water supply and drainage are repeated until the predetermined depth of the sand layer, and the water is completely replaced. It is effective when implementing the cultivation method of washing with water. Furthermore, it is possible to let it flow under the sand layer.

Claim 5 is a cultivation facility in which the enclosure according to claim 4 is made of concrete or synthetic resin. Thus, since the enclosure is made of concrete or synthetic resin, water can be stored in the enclosure, the water level can be controlled, and water management can be easily and reliably performed. It also serves as a windbreak for the plants inside the enclosure, and a net can be stretched on top.

Claim 6 is a cultivation facility in which a net hooking means is provided at a predetermined interval on the upper surface of the enclosure according to claim 4 or 5, so that the net can be stretched on the upper part of the enclosure. . In this way, on the upper surface of the enclosure, a means for hooking the net is provided at a predetermined interval so that the net can be stretched on the upper part in the enclosure. Using the hooking means, a net can be stretched on the upper part of the enclosure.

In this way, by setting a net on the upper part of the enclosure, it is possible to control sunlight, temperature, and humidity with respect to the plants and culture medium in the enclosure. It also serves as a windbreaker and insect repellent for plants. Moreover, it can prevent that a plant is directly hit by heavy rain and deteriorates.

A seventh aspect of the present invention is a cultivation facility in which the height from the average level of the cultivation ground inside the enclosure according to the fourth, fifth, or sixth aspect to the upper end of the enclosure is 30 to 70 cm. Thus, by making the height of the enclosure about 30 to 70 cm from the average level of the cultivation ground inside the enclosure, the upper end of the inside plant can be made not to contact the net stretched on the top. Moreover, it can prevent that a crosswind strikes an internal plant.

According to the method of stirring sand, soil and water in a state where water is accumulated as in claim 1, sand is first precipitated due to the difference in specific gravity, and a layer of soil is deposited thereon. It becomes easy to provide a 3-20 cm thick soil layer on a ~ 30 cm thick sand layer. Therefore, after the sand layer is laid uniformly and horizontally, it is not necessary to perform an advanced man-made operation such as laying the soil layer uniformly and horizontally on the sand layer. . In addition, although the layer thickness of a sand layer is suitable about 9-11 cm, depending on a plant, about 5-30 cm thickness is accept | permitted. Moreover, a soil layer is accept | permitted to the range of about 3-20 cm thickness depending on a plant.

As in claim 2, when the treatment of plowing and leaving in a state where water is stored as described above is performed once a year, sand and soil are washed away, so that harmful microorganisms can be eliminated. Can be killed.

As in claim 3, a soil layer is provided on the sand layer, plants are cultivated, water is supplied to a predetermined water level, left for a predetermined time, then drained, and then supplied to a predetermined water level again. By replacing all the water, at least the sand layer can be reliably washed with water, so that problems such as organic decay do not occur. Since sand is well drained, all sand can be drained in a relatively short time.

In addition, since new water containing oxygen is supplied, sufficient oxygen can be supplied to the roots of the plant. Unlike sand layer cultivation, the water in the enclosure is not allowed to flow away, but is left for a long time, so that it consumes less water, is economical, and it is easy to secure a water source.

Since the water level is supplied to a predetermined water level below the surface of the soil layer, the soil surface is submerged and the fertilizer component on the soil surface does not flow out. Operation of water supply and drainage into the enclosure can be easily realized by automation and remote operation, and labor cost can be reduced by labor saving. In addition, the method of always allowing water to flow under the sand layer is also possible.

5-5 cm thick sand layer by mixing sand, soil and water as in claim 4 and letting it stand, precipitating sand first by a difference in specific gravity, and depositing a layer of soil thereon In the plant cultivation facility where a layer of soil of 3 to 20 cm thickness is provided on the top, a water supply port and a drain port are provided in the enclosure so that at least the water level in the sand layer can be managed. Water management such as controlling the water level in the sand layer by adjusting the water supply / drainage amount by opening / closing the water supply and drainage ports, adjusting the opening / closing amount, adjusting the overflow height, etc. becomes possible. In addition, since the drain outlet is disposed at the bottom of the sand layer or at a position lower than the sand layer, by opening this drain outlet, water supply and drainage are repeated up to a predetermined depth of the sand layer, and the water is completely replaced. It is effective when implementing the cultivation method of washing with water. Furthermore, it is possible to let it flow under the sand layer.

Since the enclosure is made of concrete or synthetic resin, water can be stored in the enclosure, the water level can be controlled, and water management can be easily and reliably performed. It also serves as a windbreak for the plants inside the enclosure, and a net can be stretched on top.

When a net hooking means is provided on the upper surface of the enclosure at a predetermined interval so that the net can be stretched on the upper part of the enclosure as described in claim 6, the net is obstructive for work. Other than the above, a net can be stretched on the upper part of the enclosure using the hooking means.

In this way, by setting a net on the upper part of the enclosure, it is possible to control sunlight, temperature, and humidity with respect to the plants and culture medium in the enclosure. It also serves as a windbreaker and insect repellent for plants. Moreover, it can prevent that a plant is directly hit by heavy rain and deteriorates.

As described in claim 7, by setting the height of the enclosure to about 30 to 70 cm from the average level of the cultivation ground inside the enclosure, the upper end of the plant inside does not contact the net stretched on the top. Can be. Moreover, it can prevent that a crosswind strikes an internal plant.

Next, an embodiment of how the cultivation method and cultivation facility according to the present invention are actualized will be described. FIG. 1 is a plan view of a cultivation facility according to the present invention, and a concrete enclosure 1 is provided so that water can be stored. The enclosure 1 may be formed by stacking concrete blocks, or may be placed on site using a formwork as in the case of constructing a wall of a house. Alternatively, the enclosure 1 may be formed using polystyrene foam or other synthetic resin.

The enclosure 1 has a water supply port i for supplying water in the enclosure, and a drainage port O for drainage is provided on the substantially opposite side. FIG. 2 is a cross-sectional view taken along the line A-A in FIG.

Reference numeral 2 denotes a water-tight bottom, which is formed substantially flat with concrete or the like so that the water stored in the enclosure 1 does not leak. Alternatively, the natural ground is hardened to prevent water leakage. This can also be achieved by laying a vinyl sheet.

A sand layer 3 having a thickness T of about 6 to 8 cm is laid on the water-tight bottom 2, and watercress or the like is cultivated on the sand layer 3. That is, water is supplied into the sand layer 3 from the water supply port i to accumulate water up to a predetermined water level in the sand layer 3, and excess water flows out from the drain port O. In this way, the sand layer 3 is cultivated in a state where the sand layer 3 is moderately wetted or the lower part is immersed in water. The drain port O is made lower than the sand layer 3 so that the water in the enclosure 1 can be surely drained. V is an on-off valve.

On the upper surface of the enclosure 1, means 4 for hooking the net are planted at predetermined intervals. For example, as the net hooking means 4, a reinforcing bar, a bolt, a thick nail, or the like is used, and the net 1 is fixed on the upper surface of the enclosure 1. The interval is about 1 m, for example.

FIG. 3 shows a state in which the net 5 is hooked on the net hooking tool 4, and the net 5 is stretched on the upper part of the enclosure 1. 6 is a plant cultivated in the sand layer 3, and the extent that the upper end of the plant 6 does not contact the net 5 is good. When water-based vegetables such as watercress are cultivated as a plant, the height is about 30 to 50 cm at most, and therefore the height of the enclosure 1 is preferably about 60 cm from the surface of the sand layer 3.

In this way, when the net 5 is stretched on the upper part of the enclosure, it is possible to control the sunlight, temperature, humidity, and the like for the plants 6 and the medium in the enclosure. It also serves as a windbreaker and insect repellent for plants. In the case of heavy rain, it hits the net 5 and scatters in the form of a mist, so there is no risk that the plant will be hit by heavy rain and deteriorate. The mesh or color of the net 5 is appropriately selected according to the situation. In addition, if both ends of the pipe 14 are stood up using the hook 4 and an arch shape is formed in the upper part of the enclosure and a vinyl is stretched thereon, frost damage can be prevented.

When a plant such as watercress is cultivated using this sand layer 3, the water level is controlled according to the growth process of the plant. Usually, the surface of the enclosure 1 is set so that the surface of the sand layer 3 is moistened. Fresh water is supplied from the water supply port i. In order to make the surface of the sand layer 3 wet, when the layer thickness T of the sand layer 3 is about 6 to 8 cm, it is soaked in water from about two thirds to a depth d of about two thirds. It is good to make the water level. Moreover, the water is always allowed to flow with the drain port O and the water supply port i opened.

That is, the water supply port i and the drain port O are opened, and the water in the enclosure is always allowed to flow while maintaining the water level d by controlling the opening degree and the overflow height. In order to control the water level d, the overflow means may be used while supplying a large amount of water at all times, and the water level d may be overflowed when a predetermined water level d is reached. In order to save water, the amount of water to be allowed to flow away may be set small.

Thus, if water is always allowed to flow on the lower side d of the sand layer 3 so that the upper surface of the sand layer 3 can be kept wet, no water flow is generated on the upper surface of the sand layer 3. The fertilizer sprayed on the upper surface is not washed away, and the fertilizer is not wasted.

Further, since fresh water containing oxygen flows in the lower part of the sand layer 3 where the roots of the plants are stretched, oxygen can be supplied from the roots of the plants. In addition, since the sand layer 3 is always washed with fresh water, there is no risk of corrosion of organic matter, and there is no fear of adversely affecting plants. Even in such sand cultivation, it is possible to completely replace the water in the enclosure, but since the drying speed of the sand layer 3 is fast while it is completely drained, it is always stored up to a certain water level d. Water management is easy to keep away.

The water level d varies depending on the type of plant and the growth process, and should be controlled according to the situation. Generally, the upper surface of the sand layer 3 should be moistened. That the upper surface of the sand layer 3 is moist means that the entire sand layer 3 is moist. However, even if the whole T is not necessarily wet, as long as it is within about 2 cm from the upper surface of the sand layer 3, it may be sufficient that a part near the depth of 2 cm is wet. That is, the surface may be dry.

When cultivating watercress or the like as in the above-described embodiment, the layer thickness T of the sand layer 3 is suitably about 6 to 8 cm, but in the case of a plant whose roots do not extend deeply, a layer of about 3 to 6 cm. Thickness may be sufficient. Moreover, in the case of a plant with deep roots, the layer thickness may be 8 cm or more.

Since the net 5 should be such that the upper end of the plant 6 in the enclosure does not touch, it is necessary to set the height of the enclosure 1 according to the type of the plant. In the case of a short plant, a height of about 30 cm may be sufficient from the average level of the cultivated sand surface inside the enclosure, and in the case of a tall plant, the height needs to be increased to about 70 cm.

By placing the net 5 on the upper part of the enclosure, direct sunlight on the plant is blocked, so that the plant can be prevented from being damaged. Further, since moisture evaporated from the sand layer 3 in the enclosure is difficult to escape, the humidity can be controlled so that the inside of the enclosure does not dry out too much. Plants can also be prevented from being damaged or degraded by heavy rain. Of course, it can be used to protect against wind and insects.

In order to grow plants on the sand layer 3 in this way, water-based plants such as watercress and wasabi are suitable. Therefore, Ensai, Mitsuba, Serina, etc. are also suitable.

FIG. 4 shows a cultivation facility suitable for cultivation of terrestrial vegetables such as green onions and spinach. In FIG. 4, a sand layer 3 is provided on a water-tight bottom 2 and a soil layer 7 is provided thereon. In this case, the layer thickness T of the sand layer 3 is suitably about 9 to 11 cm. Moreover, although the layer thickness of the soil layer 7 changes with plants to cultivate, in the case of mustard vegetables, spinach, a Chinese cabbage, etc., about 9-11 cm is good. In the case of ordinary leeks, 6-9 cm is preferable. In the case of large onions, about 16 to 18 cm is preferable.

The water management in this case also differs depending on the type of plant and the degree of growth, but usually a replacement method is good. For example, water is supplied to a water level d so as to be immersed to a depth of about one third to two thirds of the sand layer 3, left for a predetermined time, and then drained from the drain port O.

Although depending on the area in the enclosure 1, water is supplied from the water supply port i in the state where the on-off valve V of the drain port O is closed, for example, for about 30 minutes. Then, when the water level d as described above is reached, the water supply is stopped. Then, for example, it is left for about 23 hours. That is, the water is kept under the sand layer 3. Next, the drain port O is opened for about 30 minutes to drain all the water in the enclosure.

After draining in this manner, the operation of closing the drain port O and supplying water to the predetermined water level d is repeated. In addition, after draining the whole enclosure, you may start the next water supply immediately, but you may start water supply after a predetermined time interval according to the kind and growth degree of a plant. Even in the case of heavy rain such as long rain, water should be supplied after a time interval. Also, when there is a lot of rain or in the rainy season, this operation is stopped and the drain port O is opened so that rainwater does not collect in the enclosure.

In this way, in a two-layer cultivation facility in which the soil layer 7 is provided on the sand layer 3, as described above, water is supplied to the water level d such that a part of the sand layer 3 is immersed in water, and is left for drainage. In the case of the cultivation method in which the water of the sand layer 3 is replaced, in the case of the above-mentioned sand layer cultivation, the water is completely replaced as compared to the case where the stagnation may occur in a place where the flow is poor, in order to keep it constantly flowing Fresh water can be used. Moreover, the amount of water used can be reduced to reduce the cultivation cost, and water can be easily secured.

Moreover, since the water after accumulation is drained and replaced with new water, it is possible to wash the sand layer and solve problems such as organic decay. In addition, since new water containing oxygen is supplied, sufficient oxygen can be supplied to the roots of the plant.

The water level d is set such that the entire sand layer 3 or a part of the lower side is soaked in water, and the moisture level in the sand layer 3 can be given moisture by the moisture in the sand layer 3. However, this water level d can also be suitably selected according to the kind of plant and the growth process. In any case, since the surface of the soil layer 7 is not soaked in water, the fertilizer component on the soil surface does not flow out by the water flow.

In addition, although the layer thickness T of the sand layer 3 is suitable about 9-11 cm, depending on a plant, about 5-30 cm thickness is accept | permitted. Moreover, the soil layer 7 is accept | permitted to the range of about 3-20 cm thickness depending on a plant.

In this way, even if the water in the enclosure is completely replaced, the soil layer 7 can maintain the humidity and the sand layer 3 is located below the soil layer 7 and drying is slow. There is no worry that the plant will run out of water even if it is drained. In addition, as in the case of sand layer cultivation, it is also possible to leave it flowing at the lower part d of the lower sand layer 3.

As shown in FIG. 4, in order to provide the sand layer 3 and to provide the soil layer 7 thereon, the layer may be artificially formed. And the soil and water are agitated. If left as it is, the sand will settle first due to the difference in specific gravity. Thereafter, the soil gradually precipitates and accumulates on the sand layer 3, and the soil layer 7 is formed. Finally, drain all the water in the enclosure.

Therefore, it is possible to complete the cultivation facility at low cost without requiring complicated and advanced work of laying the sand layer 3 uniformly and horizontally and then laying the upper soil layer 7 uniformly and horizontally. In addition, when the process of plowing and leaving in a state where water is accumulated in this manner once a year is performed, the sand and soil are washed, so that harmful microorganisms can be eliminated or killed.

Next, the water level control in the case where the water in the enclosure 1 is always allowed to flow will be described. If a plurality of horizontal holes having different heights are opened in the enclosure 1 and a hole that is not used is plugged and closed, a desired water level can be set by the open horizontal hole.

When the water level is frequently controlled, a rotary L-shaped pipe as shown in FIG. 5 may be used. That is, using a thick L-shaped pipe P, one horizontal side 8 is horizontally arranged at the position of the drain port O in FIG. 4, and the other one side 9 stands vertically outside the enclosure 1. The elbow 10 is fixed integrally with the vertical side 9, but can rotate with respect to the horizontal side 8.

A drainage basin 11 is preferably formed inside the drainage port O. Then, when the vertical side 9 is set up straight, water at a level higher than the top end of the vertical side 9 overflows from the top end of the vertical side 9 and is drained. As a result, the water level in the enclosure is maintained at L1.

Further, as shown by the broken line in FIG. 5 (2), when the vertical side 9 is inclined, the height of the outlet at the top end becomes low, and water at a level higher than L2 overflows. Maintained. Like the chain line, all water in the enclosure is completely drained when it is completely defeated.

In addition, a filter F is provided between the sand layer 3 so as to surround the ridge 11 so that sand does not flow into the L-shaped pipe P.

As is apparent from FIGS. 2 to 5, the drain port O is provided at the position of the bottom 2a in the enclosure so that all the water in the enclosure can be surely drained. In addition, if the drain outlet O is provided in the position lower than the bottom face 2a in the enclosure by lowering the bottom of the drainage basin 11, drainage becomes more reliable and easy.

Various means for supplying water to the enclosure have also been devised. In the case of FIG. 1, the water pipe is horizontally inserted into the enclosure 1 at the position of the sand layer 3, but in the case of FIG. 3, the sand is not scattered on the sand layer 3 by water pressure. A sponge or a rag 12 is laid on top of which water from the water supply pipe falls.

In FIG. 4, a ridge 13 similar to the ridge 11 of FIG. 5 is also provided on the water supply side, and a filter F is provided between the ridge 13 and the sand layer 3 or soil layer 7. And the water from the water supply pipe i falls in this ridge 13.

In addition, when the area in an enclosure is large, you may make it the structure where the water supply port i and the water discharge port O are disperse | distributed and arrange | positioned in multiple places, respectively, and the time of water supply or drainage is shortened.

As described above, the sand layer 3 and the soil layer 7 are used in FIG. 4, but the soil of the soil layer 7 may be a soil mixed with some volcanic ash or organic matter depending on the situation at the site. Moreover, coarse soil may be used. In any case, any soil may be used as long as it is sedimented and deposited later on the sand layer that has settled first.

It is a top view of the cultivation facility by this invention. It is AA sectional drawing of FIG. It is sectional drawing of the state which stretched the net. It is a longitudinal cross-sectional view of the cultivation facility suitable for cultivation of land-based vegetables. It is sectional drawing and the side view which show the water level control method by an L-shaped pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Enclosure 2 Watertight bottom i Water supply port O Drainage port 3 Sand layer 4 Net hooking means 5 Net 6 Plant 7 Soil layer P L-shaped pipe 10 Elbow 11 Drainage basin
F Filter 13 Water supply tank

Claims (7)

In the enclosure where water can be stored, by mixing the sand, soil and water in a state where water is stored, the mixture is allowed to stand, and the sand is first precipitated due to the difference in specific gravity, and a layer of soil is deposited thereon. A layer forming method for a cultivation facility, wherein a layer of soil having a thickness of 3 to 20 cm is provided on a layer of sand having a thickness of 5 to 30 cm. The method for forming a layer of a cultivation facility according to claim 1, characterized in that the treatment of plowing and leaving in a state where water is accumulated as described above is performed about once a year. As described above, a soil layer is provided on the sand layer to cultivate plants,
A method of repeating the operation of supplying water up to a predetermined water level below the surface of the soil layer, leaving it for a predetermined time, then draining, and supplying water again to the predetermined water level in the enclosure. Alternatively, the cultivation method according to claim 1 or 2, wherein water is always allowed to flow under the sand layer. By mixing the sand, soil, and water in a water storage enclosure, the mixture is allowed to stand, and the sand is first precipitated due to the difference in specific gravity, and a layer of soil is deposited thereon. In a plant cultivation facility in which a 3-20 cm thick soil layer is provided on a 30 cm thick sand layer,
Cultivation characterized in that a water supply port and a drain port are provided in the enclosure so that at least the water level in the sand layer can be managed, and the drain port is disposed at the bottom of the sand layer or at a position lower than the sand layer. Facilities. The cultivation facility according to claim 4, wherein the enclosure is made of concrete or synthetic resin. The cultivation facility according to claim 4 or 5, wherein a net hooking means is provided on the upper surface of the enclosure at a predetermined interval so that the net can be stretched on the upper part of the enclosure. . The cultivation facility according to claim 4, 5 or 6, wherein a height from an average level of the cultivation ground inside the enclosure to an upper end of the enclosure is 30 to 70 cm.

Images