JP2021177746A - Small ripe burdock and method for cultivating small ripe burdock - Google Patents

Abstract

To provide a burdock suitable for cultivation at both facilities and plant factories (sunlight-cultivation, cultivation in combination with sunlight, or total artificial-light cultivation), and a technique on burdock cultivation.SOLUTION: A small ripe burdock has the following properties of (1) and (2): (1) the length of an edible part in the harvesting season is 2/3 or less of the length of an edible part of the normally grown burdock of the same kind; and (2) the roots have a dietary fiber of 6 g/100 g or more. There is also provided a method for cultivating a small ripe burdock. Soil is put into a cultivation container allowing bottom watering up to such a depth that the length of an edible part in the harvesting season is 2/3 or less of the length of an edible part of the normally grown burdock of the same kind. A seed or seedling of burdock is put in the cultivation container and the burdock is cultivated while applying growth stress and water stress to its roots in the latter stage of cultivation.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for cultivating small-sized matured burdock and small-sized matured burdock, which is suitable for institutional cultivation and cultivation in a plant factory (sunlight type, combined sunlight type, completely artificial type).

A "plant factory" is a year-round plan from sowing, raising seedlings, planting, harvesting, and shipping of crops by keeping the environmental conditions such as temperature, light, carbon dioxide, and nutrient solution in the facility in the optimum state with a control device. It is a consistent production system. In recent years, the frequency of abnormal weather such as large typhoons and continuous heavy rains has increased. When such a thing happens, the yield of vegetables decreases, and even if they can be harvested, the quality deteriorates. In addition, each vegetable has its own season, and it is difficult to cultivate vegetables of the same quality as the season in the open field throughout the year.

Under these circumstances, many plant factories that grow plants by hydroponics (hydroponic cultivation) have been put into practical use. However, the plants that have been put into practical use in hydroponic (hydroponic cultivation) plant factories are mainly limited to leafy vegetables such as lettuce, watercress, and basil. Root vegetables, especially carrots and burdock whose main root (taproot) is edible, are still cultivated in the open field for the following reasons.
(1) These root vegetables have a long cultivation period, and it is difficult to make a profit in a plant factory where initial investment and subsequent running costs are high.
(2) Root vegetables whose edible part is the main root (taproot), if the main root (taproot) part that becomes the edible part is soaked in nutrient solution or if there is a lot of water around the main root (taproot), the main root (taproot) It is difficult to cultivate in a hydroponic plant factory because the roots do not grow.
(3) In order to enlarge and mature the main root (taproot), it is desirable to receive pressure from soil.
That is, root vegetables such as carrots and burdock that have been cultivated conventionally are not suitable for institutional cultivation or cultivation in a plant factory.

Although it has the above-mentioned various problems, it is not affected by natural phenomena and climate. Therefore, it is desired to cultivate root vegetables in a facility or in a plant factory, and a plant cultivation system suitable for cultivating root vegetables has been proposed. .. For example, in Japanese Patent Application Laid-Open No. 2008-118957, a plurality of cultivation beds are arranged in multiple stages so as to overlap each other in a plan view, and each cultivation bed holds a medium containing montmorillonite in which a plant is cultivated. Above each cultivation bed, a fluorescent lamp and a light emitting diode that emits light having a wavelength effective for promoting the growth of the plant are arranged as a light source for the light radiated to the plant cultivated in the medium. , A plant factory suitable for cultivation of root vegetables is disclosed (Patent Document 1).

According to these prior arts, it is possible to cultivate straight root vegetables, which are difficult to cultivate by hydroponics (hydroponic cultivation). That is, the above reasons (2) and (3) can be solved. However, with the prior art, even if straight root vegetables equivalent to open-field cultivation can be cultivated, productivity is increased (small size, short cultivation period) and added value is increased (functional component, Brix sugar content is high) compared to open-field cultivation. Can't. That is, the above reason (1) cannot be solved.

Japanese Unexamined Patent Publication No. 2008-118957

Burdock (Arctium lappa L.) is a typical crop of root vegetables. Burdock is generally cultivated in the open field, and it is necessary to grow the edible part (root) after a long cultivation period according to its plant physiology. Therefore, when trying to produce gobo at a facility or a plant factory, running costs such as equipment cost and electricity cost become a heavy burden, and the price is higher than that of gobo cultivated in the open field. If you try to match the price with the burdock grown in the open field, you cannot recover the cost. In any case, burdock was not suitable for cultivation in facilities and plant factories.

Therefore, an object of the present invention is to provide a technique for cultivating burdock and burdock suitable for cultivation in facilities and plant factories.

In order to solve the above problems, the present inventor has conducted various studies on cultivation techniques for burdock with high added value. As a result, it was found that taproot root vegetables, when they felt that the main root (taproot) could not grow any more, translocated the nutrients accumulated in the leaves to the roots, causing the roots to enlarge and mature. By utilizing this physiology and arbitrarily suppressing the growth of roots, it is possible to cultivate root vegetables that are shorter than normal cultivation but matured in a short period of time, and cultivated by bottom irrigation. It was found that the functional component and sugar content of burdock can be increased by controlling the upper layer of the cultivated soil to be slightly dry in the latter stage.

The present invention has been made based on such findings, and provides a compact matured burdock having the following properties (1) and (2). (1) The length of the edible portion during the harvest period is 2/3 or less of the length of the edible portion of the normally grown burdock of the same species. (2) The dietary fiber of the root is 6 g / 100 g or more.

Further, the present invention is a method for cultivating a small matured burdock, in which the length of the edible portion at the harvesting period is the length of the edible portion of the same type of burdock that normally grows in a cultivation container capable of bottom irrigation. The soil should be poured to a depth of 2/3 or less, burdock seeds or seedlings should be planted in the cultivation container, and the roots should be cultivated while applying growth stress and water stress in the latter stage of cultivation. It provides a characteristic method for cultivating small aged burdock roots.

According to the present invention, even existing varieties of burdock can be cultivated in a small space because they are smaller than normal cultivation but mature in a short period of time. In addition, burdock with a higher functional component and Brix sugar content can be cultivated as compared with normal cultivation. These characteristics mean that burdock with high added value can be efficiently produced even when the cultivation area is limited such as institutional cultivation or plant factory.

It is a figure which shows the size at the time of a harvest of the small matured burdock which concerns on embodiment of this invention. It is a figure which shows the measurement result of the Brix sugar content of the small matured burdock which concerns on embodiment of this invention. It is a figure which shows the appearance of the cultivation container which concerns on embodiment of this invention. It is a figure explaining the control of the soil moisture content in the cultivation process of the small matured burdock which concerns on embodiment of this invention.

FIG. 1 is a diagram showing the size of a small matured burdock (variety: Touhoku Co., Ltd.'s delicious burdock) according to an embodiment of the present invention at the time of harvest. The small matured burdock shown in FIG. 1 has the following properties (1) and (2).
(1) The length of the edible portion during the harvest period is 2/3 or less of the length of the edible portion of the normally grown burdock of the same species.
(2) The dietary fiber of the edible portion is 6 g / 100 g or more.

Here, the "length of the edible portion" means the length of the root portion of the main root (taproot) portion used for food and having a diameter of about 3 mm or more. The toothpick-shaped root with a diameter of about 2 mm seen at the tip of the main root (taproot) is a discarded part and is not included in the edible part, and refers to the upper part of about 3 mm or more. For example, "delicious burdock" cultivated in the open field grows in burdock with an effective root length of about 35 to 40 cm and a sugar content of about 16 to 19% 90 to 100 days after sowing. For example, as shown in FIG. 1, even the same "good burdock" can be harvested 46 days after sowing, the length of the edible part is about 10 cm, and the dietary fiber of the edible part (water-soluble, (Insoluble) weighs 17.5 g / 100 g, and becomes a burdock with a Brix sugar content of 33.2%.

When the root vegetables feel that the roots cannot grow any more, they transfer the nutrients accumulated in the leaves to the roots and promote the enlargement and maturation of the main roots (straight roots). By using this physiology and arbitrarily suppressing the growth of roots, it is possible to obtain root vegetables that have matured in a short period of time, although the length is shorter than that of normal cultivation, and the functional components and Brix sugar content can be obtained. Can be enhanced. In addition, by controlling the upper layer of the cultivated soil to be slightly dry in the latter stage of cultivation by bottom irrigation, which will be described later, the functional component of burdock and the Brix sugar content can be further enhanced, and the added value can be further enhanced.

FIG. 2 shows the relationship between the number of days from sowing and the Brix sugar content of the burdock cultivated by this embodiment in a fully artificial light type plant factory and the burdock cultivated under the same conditions as the open field cultivation. Comparing the two, the burdock cultivated by this embodiment has an increased Brix sugar content within a short period of time after sowing. In addition, as shown in Table 2 described later, the amount of nitrate ion, which is a guideline for maturation, is a very low value in the burdock of the present embodiment, and although it is small, it matures in a short period of time. It is shown that.

Therefore, the small matured burdock according to the present embodiment is clearly distinguished from the immature burdock obtained by thinning out young burdock in the middle of growth. That is, "small matured burdock" is compared with the same kind of normally grown burdock that matures in a small size (short period) compared to the same kind of normally grown burdock by applying growth stress and water stress. Burdock with increased dietary fiber.

The compact matured burdock according to the present embodiment further has the following property (3).
(3) The Brix sugar content of the edible portion is 20% or more.

The sugar content of general burdock is about 20%, but as shown in FIG. 2, the small matured burdock of the present embodiment has a sugar content equal to or higher than that of general burdock even though it is small (short cultivation period). It can be obtained and the added value as burdock can be further increased.

In the present embodiment, the varieties of burdock are not particularly limited, and various varieties can be small matured burdock. As the burdock variety, both long-rooted and short-rooted varieties can be used. Examples of the long root species include Takinogawa burdock, new burdock, and Oura burdock. Examples of the short root species include the delicious burdock used in this example.

Next, a method for cultivating small matured burdock according to the embodiment of the present invention will be described. FIG. 3 is a diagram for explaining an example of a cultivation container for cultivating a small matured burdock according to an embodiment of the present invention and an irrigation method.

FIG. 3 (1) is an example in which a bottom irrigation mechanism is applied to a cultivation container 10 having a closed bottom surface. The cultivation container 10 is equipped with a water supply pipe 12, and the soil S is filled therein. At the time of irrigation, water and nutrients are input from the water supply pipe 12, water and nutrients reach the bottom of the cultivation container 10, and water and nutrients are supplied from the lower layer of the soil S.

FIG. 3 (2) is an example of using a cultivation container 20 having a plurality of holes 22 having a diameter of about 3 mm on the bottom surface and supplying water or nutrients from the bottom surface thereof. At the time of irrigation, water or nutrients are put into the tray 24 in which the cultivation container 20 is installed, and water or nutrients are supplied to the lower layer of the soil S through the hole 22 at the bottom of the cultivation container 20. The number of holes 22 may be one as long as water or nutrients are supplied to the lower layer of the soil S through the holes 22 at the bottom of the cultivation container 20. Further, the hole 22 does not have to be circular, and the shape does not matter as long as the cross-sectional areas are the same. The diameter of the hole 22 is not particularly limited as long as the soil S does not leak. Further, a pot bottom net (not shown) may be laid on the bottom of the cultivation container 20.

FIG. 3 (3) is an example of using a cultivation container 30 whose bottom is closed with a material 32 that allows water to pass through but does not allow the direct roots of burdock to pass through, and supplies water or nutrients from the bottom surface thereof. The material 32 that closes the bottom is not particularly limited, and examples thereof include a water-absorbing cloth, a net, and a pot bottom net. At the time of irrigation, water and nutrients are put into the tray 24 in which the cultivation container 30 is installed, and water and nutrients are supplied to the lower layer of the soil S through the material 32 at the bottom of the cultivation container 30.

In the method for cultivating small matured burdock according to the present embodiment, the length of the edible part at the harvesting period is the length of the edible part of the same kind of burdock that normally grows in a cultivation container capable of bottom irrigation. It is characterized in that the soil is put into a depth of 2/3 or less, burdock seeds or seedlings are planted in the cultivation container, and the roots are cultivated while applying growth stress and water stress in the latter stage of cultivation. ..

The soil used in this embodiment is preferably a soil having high water retention capacity (water capacity) and fertility retention capacity (cation exchange capacity: CEC), few impurities, and stable physical properties. For example, soil containing an organic medium such as peat moss and a clay mineral such as montmorillonite is preferred.

The shape of the cultivation container is not particularly limited, and the cross-sectional shape may be circular, triangular, quadrangular, or other polygonal. However, the length of the edible part during normal cultivation varies depending on the burdock variety to be cultivated. The height (depth) of the cultivation container and the depth (amount) of the soil to be added are appropriately adjusted according to the length of the edible portion to be miniaturized and matured.

The soil depth is set so that the length of the edible portion of the burdock during the harvest period is 2/3 or less of the effective root length of the normally grown burdock of the same species. The reason is that it gives growth stress to the roots in the late stage of cultivation. Here, "growth stress" means that burdock is matured at an early stage and root elongation is suppressed in order to increase the functional component and Brix sugar content. As mentioned above, straight-rooted root vegetables have the property of translocating the nutrients accumulated in the leaves to the roots and causing the roots to enlarge and mature when they feel that the roots cannot grow any further. By using this physiology and arbitrarily suppressing the growth of roots, the length is shorter than that of normal cultivation, but it matures in a short period of time, and root vegetables with high functional components and Brix sugar content can be obtained. ..

Then, burdock seeds or seedlings are planted in a container or a cultivation container filled with soil, and burdock is cultivated while being appropriately irrigated.

FIG. 4 is a diagram illustrating control of soil moisture content in the cultivation process. In this embodiment, as shown in FIG. 4, in the early stage of cultivation, roots are grown in the vertical direction immediately after planting seeds or seedlings (FIGS. 4 (1) and (2)). However, in the late stage of cultivation, when the burdock feels that it cannot grow any more, the burdock stops growing in the vertical direction and transfers the nutrients accumulated in the leaves to the roots, causing the roots to enlarge and mature (Fig.). 4 (3) (4)). This allows burdock to mature even if the length of the edible portion is 2/3 or less of the effective root length of the normally grown burdock of the same species.

After planting seeds or seedlings, while the main root (taproot) continues to grow vertically, the water content of the entire soil is desirable for plant growth as shown in (1) and (2) of FIG. It is preferably set to (PF 1.5 to 1.8) to promote root growth. However, it is not necessarily limited to this PF value. The irrigation is not limited to bottom irrigation in the early stage of cultivation shown in FIGS. 4 (1) and 4 (2), and top irrigation or top irrigation and bottom irrigation may be used in combination. As shown in (2) of FIG. 4, when the straight root (taproot) stops straightening and the root begins to enlarge, the irrigation should be only bottom irrigation. As a result, in the late cultivation stage shown in FIG. 4 (3), the water content of the upper soil decreases due to absorption of burdock itself, transpiration from burdock leaves, evaporation from the soil surface, and the like. In this way, water stress is applied to Bogo.

After that, at the stage where the enlargement and maturation of the roots are accelerated, as shown in (4) of FIG. 4, only the soil at the bottom of the cultivation container, that is, the tip of the main root (taproot) is required for maturation and maturation. The amount of irrigation from the bottom is adjusted so that the water content (PF 1.8 to 2.2) is maintained and the upper soil is in a dry state (PF 2.5 to 3.0). However, it is not necessarily limited to this PF value.

In this way, by lowering the water content around the main root (taproot) that you want to enlarge, you can promote the enlargement and maturation of the main root (taproot), and at the same time, increase the functional components due to water stress, Brix. The sugar content can be increased.

In this embodiment, an example in which one strain of burdock is cultivated in one cultivation container is shown, but the present invention is not limited to this, and two or more strains of burdock may be cultivated in one cultivation container. It is possible. Further, it is desirable that the cultivation container has a shape that can not only limit the length of the burdock main root (taproot) extending vertically, but also suppress the main root (taproot) from trying to extend laterally. .. This lateral restraint may be carried out, in part, by the side wall of the container or cultivation container, or by mutual interference of roots due to dense planting.

In the present embodiment, as for cultivation conditions (fertilizer, pesticide, etc.) other than those described above, normal cultivation conditions in burdock cultivation can be adopted.

1. 1. Cultivation test of small matured burdock The soil for burdock cultivation was put into the cultivation container shown in FIG. 3 (2), and the seeds of burdock (delicious burdock) were sown and cultivated there.

During the cultivation period, small matured burdock was harvested in several batches for sampling. FIG. 1 is a sample of a small matured burdock 46 days after sowing.

2. 2. Component analysis (1) Dietary fiber The dietary fiber of small matured burdock cultivated based on this embodiment was measured by the enzyme gravimetric method (modified Proski method) (analysis was outsourced to Medical Fruit and Vegetable Research Institute Co., Ltd.). The results are shown in Table 1.

As shown in Table 1, it was confirmed that the small matured burdock of the present invention has significantly increased dietary fiber as compared with the normally cultivated burdock. Although dietary fiber is water-soluble and insoluble, it was revealed that in the small matured burdock of the present invention, the water-soluble dietary fiber was significantly increased (6.65 times).

(2) Brix sugar content The Brix sugar content (using a Brix sugar content meter) of small matured burdock cultivated based on this embodiment was measured. The results are shown in Table 2. The measurement was outsourced to Medical Deliverables Research Institute Co., Ltd., which has a track record of conducting many component analyzes of burdock. In our database (DB), it was confirmed that the Brix sugar content is 1.5 times higher than the average value in December when the value of Brix sugar content is the highest in burdock cultivated normally. rice field.

(3) Antioxidant power In addition, the company measured the antioxidant power (by the DPPH method) and the nitrate ion content (by the RQ flex meter). The results are shown in Table 2. Regarding the antioxidant power (plant stress resistance), it was clarified that the value is as high as about 1.7 times the highest May average value.

(4) Nitrate ion The nitrate ion content was as low as 1% or less of the July average value. Regarding the amount of nitrate ion, the numerical value decreases with maturation, and it was confirmed from this result that the small matured burdock of the present embodiment can be said to be mature although it is small.

According to the taste evaluation (raw food) by a researcher of Medical Deliverables Research Institute Co., Ltd., the small matured burdock has a soft texture, a light taste without harshness, and a good scent of burdock and a gentle sweetness. was gotten.

10 ... Cultivation container 12 ... Water supply pipe 20 ... Cultivation container 22 ... Hole 24 ... Tray 30 ... Cultivation container 32 ... Permeable material S ... Soil

Claims (5)

A small mature burdock having the following properties (1) and (2).
(1) The length of the edible portion during the harvest period is 2/3 or less of the length of the edible portion of the normally grown burdock of the same species.
(2) The dietary fiber contained in the edible portion is 6 g / 100 g or more. Further, the compact matured burdock according to claim 1, which has the following property (3).
(3) The Brix sugar content of the edible portion is 20% or more. It is a method of cultivating small matured burdock.
Soil is put into a cultivation container capable of bottom irrigation so that the length of the edible part at the time of harvest is 2/3 or less of the length of the edible part of the normally grown burdock of the same species. death,
It is characterized in that burdock seeds or seedlings are planted in the cultivation container and cultivated while applying growth stress and water stress to the roots in the latter stage of cultivation.
Cultivation method of small aged burdock. The small aged burdock according to claim 3, wherein the growth stress suppresses root growth so that the length of the edible portion of the normally grown burdock of the same species is 2/3 or less. Cultivation method. The method for cultivating small matured burdock according to claim 3 or 4, wherein the water stress controls the water content of the upper layer of the soil in the cultivation container to be lower than the water content of the lower layer.

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