JPH0451832A - Method for artificially cultivating japanese horseradish - Google Patents

Abstract

PURPOSE:To enable complete controlled culture of Japanese horseradish by planting seedlings of the Japanese horseradish in a culture medium composed of rock wool formed from natural rocks and raising the seedlings under special conditions while feeding an aqueous solution containing a fertilizer thereto. CONSTITUTION:Natural rocks are melted and formed into a fibrous form to provide rock wool 7, which is then formed into a granular shape having 1-30 mm grain size and 0.1-0.5 g/cm<3> bulk density. The resultant granular rock wool is subsequently wrapped in bags 5 and 6 composed of a root-penetrating sheet to afford a water holding material layer 3 and an artificial culture medium layer 4. The aforementioned water holding material layer 3 and culture medium layer 4 are then laminated through a root-penetrating sheet 8 in a water tank 1 of a flat bed to provide a cultivation bed for nutriculture. Seedlings of Japanese horseradish are then planted on the resultant culture medium layer 7 and water from a water supply source 11 is passed through a solenoid valve 15 to fertilizer feeding and mixing pipes 19 and 20. A liquid fertilizer from fertilizer stock solution tanks 12 and 13 are subsequently fed, mixed therewith and fed through a filter 17 and a liquid feed tube 9 to raise the seedlings at 5-30 deg.C ambient temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an artificial cultivation method for cultivating wasabi belonging to the genus Wasabi in the family Brassicaceae using hydroponic fertilizer.

(Conventional technology and its problems) Traditionally, wasabi cultivation was divided into water wasabi cultivation and Oka wasabi cultivation. It is grown naturally using limited spring water. Wasabi Oka is cultivated naturally by planting seedlings in forested fields with little direct sunlight. In these conventional natural cultivation methods, the purpose of mizuwasabi is mainly to harvest the rhizomes, and the purpose of Oka wasabi is mainly to harvest the leaves and stems.

On the other hand, in recent years, it has become possible to grow Oka wasabi with well-developed rhizomes by controlling irrigation and fertilization, but the quality of the rhizomes is inferior to that of mizu wasabi, so it is difficult to grow it in the field. Methods such as transplanting Oka wasabi to wasabi fields and making it into mizuwasabi are used.

This kind of conventional wasabi cultivation, when it comes to water wasabi,
It can only be cultivated in areas with good quality water sources, and creating wasabi fields is very expensive and prone to water damage. Moreover, it requires a lot of labor to clean the soil after harvesting. there were.

- Growing high-quality rhizomes using wasabi requires skill in fertilization and irrigation management, is susceptible to diseases, and has problems with quality, such as an earthy odor and astringent taste.

Due to these problems, research has recently been carried out on in-house hydroponic cultivation, and in-house hydroponic cultivation using the wasabi field method has been attempted. This cultivation method is either a method of artificially creating the same conditions as a natural wasabi field in a greenhouse, or a method of pouring liquid fertilizer into a water tank and cultivating wasabi in it, as in conventional hydroponic cultivation. are 10 to 15 throughout the year.
It is said that it is necessary to maintain the water temperature at ℃, and it is expensive to prevent the temperature inside the facility from rising during the summer.
Not only can it be cultivated only in specific regions, it is also extremely difficult to produce rhizomes with a normal shape and high commercial value.

(Problems to be Solved by the Invention) In view of the above-mentioned problems, the present invention provides a method for cultivating wasabi that can be easily cultivated using low-cost artificial facilities throughout the year, regardless of people, regions, and water source conditions. The purpose is to

(Means for Solving the Problems) In order to achieve the above-mentioned objects, the present inventors have completed the present invention through extensive research and repeated experiments, and its characteristics are as follows: A rock wool made by dissolving natural rock and forming it into a fiber is used as a medium, wasabi seedlings are planted in the medium, and water with dissolved fertilizer is supplied at a room temperature of 5 to 30°C. The aim is to foster the development of

The above medium can be made of not only rock wool, but also inorganic materials such as perlite, pumice, gravel, sand, charcoal, zeolite, artificial fibers such as polyester fiber and glass fiber, etc., and water-retaining materials that do not contain plant pathogens. And/or a member that improves air permeability may be laminated or mixed as appropriate.

(Function) According to the method of the present invention, since rock wool made by dissolving natural rock into fibers is used as an artificial medium, the medium itself is inherently sterile, and therefore the fertilizer and water to be supplied, etc. As long as they do not contain pathogenic bacteria, they will not be affected by diseases even if the temperature rises, while the amount and concentration of water and fertilizer supplied can be easily controlled automatically.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a hydroponic bed used in the practice of the present invention. This hydroponic cultivation bed consists of a water retaining material layer 3 in a flat-bottomed water tank 1.
and an artificial medium layer 4 are accommodated in two layers, one on top of the other. Both of these layers 3.4 are constructed by arranging bags in which rounded rock wool 7 is wrapped in a bag 5.6 made of a see-through sheet.

Rockwool 7 is made by heating and melting natural stone, forming it into a fiber, and rolling it into granules.
~30 m+ and a bulk density of approximately 0.1 to 0.5 ir/- are used.

The artificial medium layer 4 is stacked on the water-retaining material layer 3 with an opaque plate sheet 8 interposed therebetween to prevent plant roots from growing into the water-retaining material layer.

A liquid supply tube 9 is passed over the artificial medium layer 4, and liquid is supplied onto the artificial medium layer 4 from liquid supply nozzles 9a provided in the liquid supply tube 9 at regular intervals.

Liquid is automatically supplied to the liquid supply tube 9 from a liquid fertilizer equipment 10, and this equipment 10 has pumps 12a, 13a from a plurality of fertilizer stock solution tanks 12, 13 in a flow path from a water source 11. The liquid fertilizer is fed in, mixed, and supplied to the infusion tube 9. Water and fertilizer are supplied by controlling the opening and closing of the solenoid valve 15 and the operation of the pump 12a13a by the liquid supply control device 14. ing. In the figure, 17.18 is a filter, 19.20 is a fertilizer mixing pipe, 21 is a flow rate oscillator,
22 is a water pressure gauge, 23 is a main valve, 24 is a drain, and 25 is a water level sensor.

Further, the aquarium 1 is entirely covered with a light shielding sheet 16.

Next, an example of the wasabi cultivation method according to the present invention using the hydroponic cultivation bed configured as described above will be described.

(1) Seedlings Summer-sown potbellied seedlings with 4 true leaves were used.

(2) 9■ Vinyl bottle a with 5 holes in the bottom when raised at the end of November
The above surface was potted using a material filled with rock wool B.

(3) Planting In early February of the following year, the plants were planted on the artificial medium layer 4 of the hydroponic cultivation bed described above by leaving them in pots a as shown in FIG. 1.

(4) Management Liquid fertilizer having the formulation shown in Table 1 was supplied intermittently four times a day.

Table 1 The room temperature inside the vinyl house was maintained at 5°C to 30°C.

A heater is used in the winter, and starting in April, the building is covered with cheesecloth to cut off 50% of natural light.

Tap water was used as the raw water, and the liquid temperature was 7°C to 25°C.

? l! No heating or cooling was performed.

(5) Growth progress When a natural stone rock wool medium and a slab raw material double-ended Tsukuwool were used as a medium during the seedling-raising stage, the results of comparing the two showed that the natural stone rock wool medium produced better growth, while the slab raw material rock wool medium produced better results. The green leaves turned yellow and physiological disorders occurred.

After planting, the fertilizer concentration was divided into three areas: EC1, 5, 1, 0, 0, 5, and the growth of ECO, 5 was good. As growth progressed in the high concentration area (as the temperature increased), physiological disorders such as leaf curling (cupping symptoms) occurred.

In the taste (sensory test) conducted in late May (2.5 months after planting), the taste was sufficiently felt from both the petioles and rhizomes.

The rhizome was approximately 5m+ thick at its thickest point.

During the high-temperature period from July to September, the plants were cultivated for about 1 year and 5 months until early July of the following year while maintaining the room temperature below 30 degrees Celsius, and they were found to have a normal shape with a length of about 10.2 mm and a diameter of 21 mm. It grew on a rhizome (wasabi). In terms of taste, it had the same mustard taste and flavor as 2-year-old natural wasabi from Shizuoka.

(Effect of the invention) As described above, according to the artificial wasabi cultivation method of the present invention, by hydroponic cultivation using rock wool as a medium,
It is possible to grow wasabi with excellent rhizomes, leaves and stems even without low-temperature conditions or areas with abundant clear streams as previously thought, and the cultivation process is originally sterile and contains organic fertilizer components. Since the culture medium is made of rock wool, it is less susceptible to diseases and can also prevent over-fertilization, making it easy to cultivate wasabi under complete control.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an example of a hydroponic cultivation bed used in the method of the present invention, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1...Aquarium, 3...Water retention material layer, 4...
...Artificial medium layer, 5.6...Bag, 7...
... Rock wool, 8 ... Impermeable root sheet, 9
...Liquid supply tube 9a...Liquid supply nozzle, 10...Liquid supply fertilizer equipment, 11...Water source, 12.13...Fertilizer Stock solution tank, 12a, 1
3a...Pump, 14...Liquid supply control device, 15...Solenoid valve, 16...Light shielding sheet.

Claims (1)

[Claims] Rock wool made by dissolving natural rock and forming it into a fiber is used as a medium, wasabi seedlings are planted in the medium, and water with dissolved fertilizer is supplied at a room temperature of 5 to 30°C. A method of cultivating wasabi characterized by growing wasabi.