JPH10248376A - Earthing for cell seedling rearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide earthing for cell seedling rearing which is excellent in air permeability, water holding property, fertilizer holding property, fluidity and long preserving stability and is supplied in expensively and stably by making coir dust an effective component. SOLUTION: Coir dust (whose salt density is desirably not higher than 1.0mS/cm) consisting of thin and short fibers and a cignin remaining after removing an external peed and internal peel from a coconut and additionally removing hard and long fibers and middle short fibers from the taken out intermediate peel is made an effective component. Then, it is possible that the percentage content of coir dust at this earthing for cell seedling rearing is 10 to 90% by volume and that at least one kind of percentage content selected from burned vermiculite and perlite is 10 to 90%. In addition it is possible that a slow-release fertilizer of chemically reduced solution and physically reduced elution speed is included and that moisture percentage content is desirably not higher than 10wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soil for cultivating seedlings. More specifically, the present invention relates to cultivation soil for cell seedlings containing coir dust as an active ingredient.

[0002]

2. Description of the Related Art In Japan, where the employment of the farming population has been decreasing and the population has been aging, labor saving of agricultural work has long been said to be urgent. In order to respond to this request, a so-called cell seedling system has been developed in which horticultural crops such as vegetables, flowers, and fruit trees are raised in a very small capacity seedling raising container (seedling cell), and the seedling is transplanted to a mainland by a transplanting machine. . The cell seedling raising system is a method of systematizing each process such as soil filling, sowing, germination, transplanting, and watering, and efficiently producing a large amount of uniform seedlings in a small area. The cell seedling raising system has advantages such as the ability of farmers to avoid the burden and risk of raising seedlings and to make seedling production into a factory, and is now rapidly spreading. In particular, it is remarkable in raising seedlings of horticultural crops such as flowers, vegetables, and fruit trees.

[0003] The seedling cultivation soil based on peat moss, which has been used for pot seedling cultivation, has been diverted to the seedling cultivation soil used in the cell seedling raising system. However,
Since peat moss contains a large amount of long fiber and further requires a large amount of water to reduce the inherent water repellency of peat moss, it must be kept moist at all times. When filling the cultivation soil, the flow of the cultivation soil is poor, and especially when a filling machine is used, the fibers are likely to crosslink and clog near the discharge port, which is an obstacle to improving workability. In addition, when the cell container is deep and small in diameter, or when the entrance diameter is large but the tip is narrowed, a space in which the soil is not filled in the container due to the cross-linking of the fibers is also formed, and the uniformity is obtained. Filling is difficult and not only hinders the growth of healthy seedlings in cell seedlings, such as germination failure or poor growth, but also causes problems such as the lack of root mortar strength required for mechanical transplantation.

Conventionally, peat moss, which has been the mainstream of horticultural cultivation base materials, is excellent in that it is excellent in air permeability and water retention, has a large base substitution capacity and is excellent in fertilization, is inexpensive and can be supplied stably. Although it was a cultivated soil substrate, as described above, it was not satisfactory in terms of poor fluidity and water repellency. At present, the technology development of soil cultivation used for the cell seedling raising system is in active progress, but soil cultivation having a sufficient function has not been provided yet. Also,
Recently, demand for crushed coconut husk as an alternative to peat moss is growing, but coconut husk is made up of extremely tough plant fibers and requires a great deal of labor to grind, making it suitable for cell seedling systems. If the pulverization is carried out to such an extent that the fluidity can be obtained, the cost becomes extremely high, which is economically disadvantageous as a cultivation base material.

[0005] On the other hand, Japanese Patent Publication No. 61-58439 discloses a cultivation medium for raising rice seedlings comprising a slow-release fertilizer and a water retention material having reduced solubility or dissolution rate, as a concept of further labor saving in agricultural work. In this cultivation, the fertilizer required for growing Honda was included in the cultivation soil in addition to the fertilizer required during the seedling raising period, thereby simplifying the fertilization work in paddy rice cultivation. However, usually, slow-release fertilizers whose chemical solubility or physical dissolution rate has been reduced are dissolved or eluted as soon as there is moisture around the fertilizers. Long storage after mixing was not possible. In particular, in the conventional cultivation seedling cultivation using peat moss as a cultivation base material, it is necessary to contain a large amount of water (60% or more) in order to reduce the water repellency inherent in peat moss. It was considered impossible to mix slow-release fertilizers.

[0006]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present inventors have developed a conventional soil cultivation base material which is excellent in air permeability, water retention and fertilization, and can be supplied stably at low cost. Without diminishing the excellent characteristics of peat moss, which is the mainstream, we conducted intensive research on a new soil cultivation base material having fluidity suitable for a cell seedling raising system. As a result, the outer rind and inner rind are removed from the coconut rind, and from the extracted mesocarp, the coir dust consisting of the remaining short fibers and the woody parts, excluding the rigid fibers and short fibers, is used for cell seedling. They found that they had excellent properties as a base material for cultivation soil, and completed the present invention based on this finding.

[0007] Furthermore, if the soil is cultivated using coir dust, which is essential for the present invention, as a substrate, even if it is stored in a dry state for a long period of time, it does not exhibit the water repellency unlike cultivation using peat moss as a substrate. It has become possible to mix a slow-release fertilizer with horticultural soil without causing dissolution or elution during storage. As is apparent from the above description, an object of the present invention is to provide a seedling cultivation medium for cells that is excellent in air permeability, water retention, fertilization, and fluidity, and that can be inexpensively and stably supplied.

[0008]

Means for Solving the Problems The present invention provides the following (1):
Or (7). (1) Cultivation soil for raising cells using coir dust as an active ingredient. (2) The cultivated soil for growing cells as described in (1) above, wherein the salt concentration of the coir dust is 1.0 mS / cm or less. (3) The seedling culture for cell seedling according to (1) or (2), wherein one or more kinds selected from calcined vermiculite and perlite are added to seedling culture soil containing coir dust as an active ingredient. (4) The content of coir dust in the seedling culture was 10 to 10%.
The soil for cultivating cell seedling according to (3), wherein the content is at least 90% by volume, and the content of at least one selected from calcined vermiculite and perlite is 10 to 90% by volume. (5) The above (1) to (1) to (1) to (1), which further contain a slow-release fertilizer in which the solubility is reduced chemically or the dissolution rate is physically reduced, and the water content is 10% by weight or less. (4) The cultivated soil for raising cells according to any one of (4). (6) A coated fertilizer in which a slow-release fertilizer having a physically reduced dissolution rate is obtained by coating fertilizer particles with a coating containing at least one selected from the group consisting of sulfur, a thermosetting resin, and a thermoplastic resin. The cultivation soil for cell raising seedling according to the above (5), wherein (7) The above-mentioned (6), wherein the coated fertilizer is a coated fertilizer obtained by coating fertilizer particles with a coating containing a thermoplastic resin.
Culturing soil for cell seedlings according to the item. (8) The soil for growing cells according to the above (6) or (7), wherein the coated fertilizer has a timed elution function.

The configuration and effect of the present invention will be described in detail below. The cell seedling referred to in the present invention has a pot diameter of 1 to 8
This is a seedling raising method in which seedlings are filled in a small seedling container of about cm and seedlings are seeded with the seedlings. The seedling raising container in the cell seedling raising does not have a specific shape, but may be a connected pot-shaped container, or simply divided into a certain size by dividing the inside of a frame such as a bat. Further, a thick plate-like material may be provided with a hole for filling the soil. In ordinary cell seedlings, it is common to use cell trays or paper pots to which a number of pots are connected. As the shape of the cell tray, there are a round opening, a square opening, a square opening, and the like, but it is not particularly limited. Individual pots can be cylindrical, conical, 4
There are a prismatic type, a quadrangular pyramid type and a composite type, but the present invention is not limited to these. Of course, the bottom of each pot is provided with a hole for drainage. Cell seedlings are widely used for horticultural crops such as root vegetables, leafy vegetables and fruits and vegetables, and flowers, but can of course be used for other agricultural crops such as cereals.

[0010] Coir dust essential for the present invention is a rigid fiber or a medium-short fiber used for removing ropes, mats and mattresses from the mesocarp which is obtained by removing the outer rind and the inner rind from the coconut peel. It is the remaining short fibers and wood parts excluding. Coir dust is generally
It is made by the steps described below. The outer mesocarp, excluding the juice, endosperm and inner rind part from the coconut, is dried. The dried epicarp is soaked in fresh water for 4 to 6 weeks to remove excess tannin and chloride (removal of water) and to soak. From the soft outer mesocarp, the rigid fibers and medium-short fibers used for ropes, mats and mattresses are separated, and the by-produced short fibers and woody parts are collected as residues. The collected short fibers and woody parts are hydrated at 80-90.
%, But 40 to 50% by the dehydration step,
Moisture content is 20% by drying in the sun or hot air. Further, this dried product is subjected to a fumigation disinfection and sterilization process to remove contamination and adjust the particle size. As described above, the residue excluding the long and medium short fibers is coir dust, which is also called coir, pis, or the like. This is a so-called coconut slag, which has been conventionally discarded as unnecessary. Coir dust made in this way has water retention, air permeability, fertilizer retention equal to or higher than that of peat moss, the conventional cultivation base material, is supplied stably at low cost, and its water repellency is peat moss. It has excellent characteristics as a cultivation base material, such as being smaller than. Furthermore, since it has very good fluidity without containing long fibers and medium and short fibers, it is an optimal material for a base material for cultivating soil for growing cells.

The particle size of the coir dust used in the present invention is not particularly limited. However, since coir dust is a lower sieve component, it contains various particle sizes, and when many small particle sizes are included, the porosity of the cultivated soil decreases and the air flow tends to be poor, and Conversely, the flowability is reduced when a large amount of particles having a large particle diameter is included, or tends not to enter uniformly when packed in a cell.
Not less than 4 mm and more preferably from 0.5 to 2 mm.
mm is more preferably 50% by weight (hereinafter referred to as wt%) or more.

By the way, palm mesocarp contains a large amount of a large amount of tannin components, which are eluted and reduced by prolonged exposure to water. The degree of this reduction depends on the degree of dirt in the pickled water, the frequency of replacement, and the like. At present, the tannin content differs for each palm fiber collection site where coir dust is sieved. If the removal of the tannin component is insufficient, the action of tannin, which binds to the protein, will mainly damage the roots and cause vegetation damage. It is desirable to carry out sorting. However, the measurement of tannin itself required equipment and skill and could not be easily carried out, so that the measurement of the tannin content was a major obstacle to the selection of high quality coir dust. Through the development of the present invention, the present inventors have found that salt concentration (hereinafter referred to as EC) and tannin content show almost the same behavior, and that the water extraction method (coir dust 1: 2) was used.
EC measured by 5 ° C. ion exchange water 10) is 1.0 m
It was found that planting damage by the tannin component can be avoided if it is S / cm or less. E of the coir dust used in the present invention
C is not particularly limited, but is preferably 1.0 mS / cm or less due to the above circumstances.

[0013] The present invention is a soil for cultivating cell seedlings containing the above-mentioned coir dust as an active ingredient, and may be a single coir dust, but may contain other materials for the purpose of adding functions and improving physicochemical properties. May be. Coir dust is less water-repellent than peat moss, albeit slightly. This is considered to be due to the effect of lignin contained in coir dust. To reduce the water repellency, it is effective to add a mineral powder such as calcined vermiculite or perlite.

The particle size and blending ratio of the calcined vermiculite and perlite used in the present invention are not particularly limited, but the particle size is preferably from the viewpoint of not impairing the fluidity and further uniformly filling the cells. 1-2m
It is preferable that m is contained in the substance in an amount of 80% by weight or more, but this ratio is not necessarily limited to this range because the ratio varies depending on the mixing ratio of the coir dust to the calcined vermiculite and the pearlite. Grain shape is 2m
Those having a length of m or more cause non-uniform clogging when packed into cells, while those having a length of 1 mm or less become too dense, impair water permeability and air permeability, and cause difficulty in growing healthy seedlings. The compounding ratio is preferably 10 to 90 volumes (hereinafter referred to as vol%) of the coir dust.
1 selected from calcined vermiculite or perlite
More than one kind of compounding ratio is in the range of 10 to 90 vol%. When the blending ratio of one or more selected from calcined vermiculite or perlite is 10 vol% or less, the effect of reducing water repellency is negligible, and when it is 90 vol% or more, water retention, air permeability, and fertilization The balance of physicochemical properties such as sex is lost, and it becomes difficult to grow healthy seedlings.

In the present invention, particles other than the above-mentioned cultivation substrate and additives may be used for controlling physical properties and chemical properties as long as the effects of the present invention are not impaired. Other additives include zeolite, pumice, sand, granular soil, wood chip compost, pulp compost, granulated peat moss, granular foamed resin, and the like from the aspect of improving physical properties, and phosphoric acid and the like from the aspect of improving chemical properties. Examples include acidic substances and chemical fertilizers.

The moisture content of the cell seedling cultivation soil of the present invention is not particularly limited, but is preferably low in moisture in order to ensure good fluidity. In particular, for long-term storage of a slow-release fertilizer that has chemically reduced solubility or physically reduced dissolution rate without dissolving or dissolving, the moisture content of the soil must be 10 wt% or less. Is desirable. When the content is 10 wt% or more, the slow-release fertilizer starts to dissolve or elute, so that the salt concentration in the soil increases as the storage time elapses. When a slow-acting fertilizer more than the amount of fertilizer component required for the seedling raising period is added to the seedling cultivation soil, if the cultivation soil has a high water content, concentration disturbance will occur due to dissolved or eluted fertilizer and it is difficult to grow seedlings. Become. Therefore, in the conventional seedling cultivation cultivation using peat moss as a cultivation base material, which requires 60% or more of water to reduce water repellency, a slow-acting fertilizer with an amount of fertilizer component or more required during the seedling raising period is cultivated. It was impossible to mix them in advance.

The fertilizer having a chemically reduced solubility used in the present invention is a nitrogen fertilizer which has been slowed down by chemical synthesis. For example, isobutyl aldehyde condensed urea (I)
BDU), acetaldehyde condensed urea (CDU or O
One or more fertilizers selected from granular slow-acting synthetic organic fertilizers such as MU), formaldehyde-processed urea, guanylurea sulfate, and oxamide are used.

As the fertilizer having a physically reduced dissolution rate used in the present invention, it is preferable to use a coated fertilizer obtained by coating a granular fertilizer with a coating material. Granular fertilizers used for coated fertilizers include urea, ammonium sulfate, ammonium nitrate, ammonium chloride, ammonium phosphate, calcium nitrate, nitrogenous fertilizers such as calcium nitrate, phosphate fertilizers such as ammonium phosphate, potassium phosphate, calcium phosphate, potassium chloride, and the like. At least one selected from the group of potash fertilizers such as potash sulfate, potash nitrate and potash phosphate is used.

Examples of the coating material include sulfur, thermosetting resin, thermoplastic resin, and the like, which are generally used for coated fertilizers, and are not particularly limited. From the viewpoint of high accuracy, it is desirable that the fertilizer be a coated fertilizer coated with a coating containing a thermoplastic resin as an active ingredient. As the thermoplastic resin used for the coated fertilizer, vinylidene chloride polymer and its copolymer, olefin polymer and its copolymer, ethylene / vinyl acetate copolymer, ethylene / carbon monoxide copolymer, ethylene / vinyl acetate -Carbon monoxide copolymer, ethylene / ethyl acrylate copolymer, ethylene / methacrylic acid copolymer, rubber resin, polystyrene, polymethyl methacrylate and the like. Further, as the coating material, in addition to the above-mentioned polymer material, a low-molecular resin material such as paraffin, hardened oil, solid fatty acid, metal oil, beeswax, wood wax, petroleum resin, or rosin may be used. .

The above-mentioned slow-release fertilizer is effective when compounding a fertilizer component in a seedling cultivation soil in an amount equal to or greater than the fertilizer component amount required during the seedling raising period. When using a slow-release fertilizer with an elution pattern that begins to dissolve or elute immediately after the fertilization, concentration disturbance may occur due to the fertilizer component that dissolves and elutes during the seedling raising period. , Usage is limited. In order to avoid such restrictions, it is desirable to use a coated fertilizer having a timed elution function. A coated fertilizer having a timed dissolution function is defined as a period during which dissolution is suppressed for a certain period after application to the field (hereinafter referred to as induction period), and a period during which rapid dissolution starts after a certain period (hereinafter referred to as dissolution period). It is a coated fertilizer having: Specifically, the induction period is a period (days) required after the application until 10% by weight of the fertilizer component in the capsule elutes, and the elution period is 10 days.
Period (days) required for elution from weight% to 80 weight%
Is the elution period. In the present invention, the preferred coated fertilizer having a timed elution function has an induction period / elution period ratio of 0.2 or more.

The coated fertilizer having a timed elution function that can be used in the present invention may be one obtained by any elution mechanism and coating composition, but the specific coating composition is described in JP-A-6-87684. A film in which at least one selected from powders containing a saccharide polymer or a derivative thereof as a main component disclosed in Japanese Patent Application Laid-Open
No. 634, a first layer comprising a mixture of at least one selected from vinylidene chloride polymerization and the like, and at least one selected from water-soluble or swellable resins; A coating comprising a second layer containing at least one selected from vinylidene polymerization and the like, a first layer comprising an alkali substance disclosed in JP-A-4-202078, an olefin polymer and an alkali water-soluble polymer. A coating comprising a second layer comprising a polymer;
No. 1 comprising a water-absorbing and swelling substance disclosed in
And a second layer containing a olefin polymer as an active ingredient.

In the present invention, the slow-release fertilizer can be mixed within a range that supports the seedlings and does not impair the function as a cultivation soil. That is, if the amount of the slow-release fertilizer is large, the water retention of the cultivated soil is reduced. If the amount is too small, the fertilizer for plant growth is insufficient. It is about 95 wt%, but this value is only a guide. It should be determined according to the release period, release pattern and required amount of fertilizer for slow-release fertilizer.

Further, a fast-acting fertilizer may be added to the soil of the present invention as long as the effects of the present invention are not hindered. A wide range of components are used, and N (Chisso), P ₂ O
Any of ₅ (phosphoric acid) and K ₂ O (Kari) may be used. In addition to these, CaO (calcium), MgO
(Magnesium), trace elements, and other compounds.

[0024]

The present invention will be described below with reference to examples.
The present invention should not be limited by these examples.

1. Trial production of culture medium for evaluation A culture medium for cell seedling raising having the composition shown in Table 1 was produced as a trial, and was used in the fluidity test, the seedling growth test, and the storage stability test. The vol% of the water retention component shown in Table 1 is the ratio to the volume of only the water retention component without water and fertilizer components, and the mg / L of the fertilizer component is the amount of the fertilizer component added to the combined volume of the water retention component and moisture. And the moisture is the moisture content after mixing the water retention component and the fertilizer component. Mixing of the compositions shown in Table 1 was performed using a concrete mixer with wings having an internal capacity of 400 L, and cultivation materials (water retention component, fertilizer component, water) of each composition were added to the mixer.
Was charged at 100 L for 10 minutes at a rotation speed of 10 rpm.

[0026]

[Table 1]

* 1: Coir dust EC (1:10 water)
0.1 ms / cm, apparent specific gravity 0.10 kg / L, pH
(1:10 water) 5.9, granules having a particle size of 0.5 mm to 2 mm and 61 wt%. * 2: Ammonia sulfate manufactured by Chisso Asahi Fertilizer Co., Ltd. (guaranteed component amount: 21% nitrogen) * 3: Addition amount as nitrogen (N), unit: mg / L. * 4: Heavy fired phosphorus produced by Onoda Chemical Co., Ltd. (guaranteed component amount: 46% soluble phosphoric acid) * 5: Addition amount as phosphoric acid (P ₂ O ₅ ), unit: mg / mg
L. * 6: Kari sulfate (manufactured by Chisso Asahi Fertilizer Co., Ltd.) (guaranteed component amount: 50%) * 7: Addition amount as kali (K ₂ O), unit: mg / L. * 8: Peat Moss EC (1:10 water) 0.1ms / c
m, apparent specific gravity 0.11 kg / L, pH (1:10 water)
4.7, 69 wt% of particles with a particle size of 0.5 mm to 2 mm
Fibrous material. * 9: Coconut shell EC (1:10 water) 0.1 ms / cm, apparent specific gravity 0.10 kg / L, pH (1:10 water)
2. A fibrous material having a particle size of 0.5 mm to 2 mm and 52 wt%. * 10: Coir dust EC (1:10 water) 1.0ms /
cm, apparent specific gravity 0.10 kg / L, pH (1:10
(Water) 5.9, 66 wt% of particles having a particle size of 0.5 mm to 2 mm. * 11: Coir dust EC (1:10 water) 3.0ms /
cm, apparent specific gravity 0.10 kg / L, pH (1:10
(Water) 5.9, 64 wt% of particles having a particle size of 0.5 mm to 2 mm. * 12: Vermiculite EC (1:10 water) 0.1m
s / cm, apparent specific gravity 0.11 kg / L, pH (1: 1
0 water) 7.6, particle size 0.5 to 2 mm 80
wt% particulate matter. * 13: Pumice stone EC (1: 5 water) 0 ms / cm, apparent specific gravity 0.83 kg / L, pH (1:10 water) 6.5, particle size of 0.5 mm to 5 mm 50% by weight of granular material. * 14: CDU manufactured by Chisso Asahi Fertilizer Co., Ltd. (guaranteed component amount: 31% nitrogen) * 15: Perlite EC (1:10 water) 0.1 ms / c
m, apparent specific gravity 0.23 kg / L, pH (1:10 water)
5.9, 80% by weight with a particle size of 0.5mm to 2mm
Granules. * 16: LPSS100 (guaranteed component amount: 40% nitrogen) manufactured by Chisso Asahi Fertilizer Co., Ltd. * 17: Addition amount of coated fertilizer to the total weight of the water retention component and moisture, unit: wt%. * 18: LP30 (guaranteed ingredient quantity) manufactured by Chisso Asahi Fertilizer Co., Ltd.
Nitrogen 40%)

2. Fluidity test Suzutec potter STK-30P (maximum flow rate 90
0L / hr), of Examples 1, 3,
4,5,6,9,10, 60L of Comparative Examples 1,2,4
Into the hopper of the soil filling machine, and the flow rate is 600 L / hr.
At a flow rate of Table 2 shows the results.

[0029]

[Table 2]

In Examples 1, 3, 4, 5, 6, 9, 10 and 10, the fluidity was good, and the stuffing could be completed in almost the set time. On the other hand, Comparative Examples 1, 2, and 4 had a problem in fluidity, and clogging of the cultivated soil, which was considered to be due to the crosslinking of the fiber, occurred during operation. The wooden hammers hit the hopper, and the bridges were manually disintegrated to discharge again.However, clogging occurred many times before the discharge was completed, and the same measures had to be taken each time. did not become.

3. Seedling raising test: Seedling raising test of Chinese cabbage Examples 1, 5, 6, 7, 8, 9, 10, Comparative Examples 1, 2,
A seedling test of Chinese cabbage (cultivar: Sumitomo Chemical Co., Ltd., Gofu) was performed using the cultivated soil of No. 4. The seedling raising cell is a 128-well cell tray (the size of the entire tray: 300 mm in height, 5 in width)
90 mm, pot size: length 30 mm, width 30 mm, depth 45 mm). A soil burying machine using each of the above cultivated soils for a fluidity test [Suzutec Corp. STK-30P
(Maximum flow rate 900 L / hr)], and 30 holes were packed in each section, seeded on July 16 and grown on August 11. Cultivation management conditions such as watering and temperature management during that time were performed according to the customary method. The nursery was carried out at a glass house in Tobata-ku, Kitakyushu, Fukuoka Prefecture. Table 3 shows the results of the seedling raising test.

[0032]

[Table 3]

The growth of each of the test plots of the example was better than that of the test plot of the comparative example. In Comparative Examples 1 and 4 using a large amount of peat moss, strong water repellency was confirmed during watering. When the seedlings were pulled out from the cell at the time of the growth survey, in each test section of the comparative example, a space in which the soil was not filled was formed in the cell due to the cross-linking that appeared to be due to the fiber content of peat moss or coconut shell, Root pots of sufficient strength that could be used for mechanical transplantation were not formed. Poor growth in each test plot in the comparative example is considered to be due to insufficient water retention due to the water repellency and the space formed in the cells, and insufficient root growth. On the other hand, each of the test plots of the examples showed generally good growth. Further examination of the details shows that the test plot using vermiculite or perlite as the coir dust grows slightly better than Example 1 in which the water retention component is only coir dust. This is presumably because the use of vermiculite or pearlite reduced the water repellency inherent to coir dust. Also,
From the results of Example 6, it is clear that the effect of the present invention is not hindered even if peat moss is used in a small amount as long as it is a water retention material containing coir dust and vermiculite as main components.

4. Seedling raising test: Seedling raising test of lettuce Lettuce (cultivar:
The seedling raising test of SPS Salinas 88) manufactured by Sumitomo Chemical Co., Ltd. was performed. A nursery cell used was a 200-well cell tray (the size of the entire tray: 300 mm in height, 590 mm in width, and the size of a pot: 25 mm in length, 25 mm in width, and 45 mm in depth). A soil stuffing machine [Suzutec STK-30P (maximum flow rate 900 L)
/ Hr)], and the seeds were sown on July 16 and seeded on July 16 and grown on August 11. Cultivation management conditions such as watering and temperature management during that time were performed according to the customary method.
The nursery was carried out at a glass house in Tobata-ku, Kitakyushu, Fukuoka Prefecture. Table 4 shows the results of the seedling raising test.

[0035]

[Table 4]

As is clear from the results in Table 4, Example 1,
No. 2 was able to satisfactorily grow and cultivate seedlings. Above all, in Example 1 where EC of coir dust was the lowest, 0.1 [mS / cm], the growth of seedlings was the best. Comparative Example 3 using coir dust having a high EC of 3.0 [mS / cm] was poor in growth, and it was thought that tannins caused planting damage. In addition, EC and tannin content were almost in a proportional relationship, and both showed the same behavior. From the results of the plant damage test, the condition of the coir dust that does not impair the growth of the plant is that the EC must be 1.0 [mS / cm] or less and the tannin content must be 5.5 [wt%] or less. I understood.

5. Preservation test Put the cultivated soil of Example 11 and Comparative Example 5 in a plastic bag, seal, and leave it in a dark place at room temperature. After a lapse of 8 weeks, all the coated fertilizer particles were picked up from each soil using tweezers. Next, the fertilizer particles were ground in a mortar, all transferred to a volumetric flask, pure water was added to make the volume constant, a certain amount was taken out, and the urea concentration in the solution was determined by the PDAB method. From there, the elution amount of the fertilizer component was calculated, and the elution rate was calculated by dividing by the amount of the fertilizer component initially contained.

[0038]

[Table 5]

As can be seen from Table 5, in Example 11, the elution of the fertilizer component was suppressed, and the state at the time of mixing was maintained. In Comparative Example 5, the elution of the fertilizer component was started by the moisture in the soil, and the elution was almost completed.

[0040]

The cultivation soil for cell seedlings of the present invention is not only excellent in air permeability, water retention and fertilizing properties, can be supplied stably at low cost, but also has fluidity suitable for a cell seedling raising system. By using the cultivation soil for cell seedlings of the present invention, low cost and efficient cell seedlings have become possible. Furthermore,
Even when the soil for cultivating seedlings of the present invention is stored in a dry state, since it does not exhibit extreme water repellency as compared with the conventional seedling cultivation based on peat moss, a slow-acting fertilizer is used. Even in the case of being mixed with the culture medium for growing cells of the present invention, it has become possible to store for a long period without causing dissolution or elution during storage.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C09K 101: 00

Claims (8)

[Claims] 1. A soil for raising seedlings of cells comprising coir dust as an active ingredient. 2. The salt concentration of coir dust is 1.0 mS / c.
m. 3. The culture medium for growing cells according to claim 1, wherein one or more kinds selected from calcined vermiculite and perlite are added to the culture medium for raising seedlings containing coir dust as an active ingredient. 4. The method according to claim 1, wherein the content of coir dust in the seedling culture is from 10 to 90% by volume, and the content of at least one selected from calcined vermiculite and perlite is from 10 to 90% by volume. 3. Culture soil for cell seedlings according to 3. 5. The method according to claim 1, further comprising a slow-release fertilizer whose solubility is reduced chemically or whose dissolution rate is physically reduced, and whose water content is 10% by weight or less. The cultivated soil for cell raising and seedling according to any one of claims 4 to 4. 6. A coating comprising a slow-release fertilizer having a physically reduced dissolution rate, wherein the fertilizer particles are coated with a coating containing at least one selected from the group consisting of sulfur, a thermosetting resin, and a thermoplastic resin. The cultivation soil for cell raising seedling according to claim 5, which is a fertilizer. 7. The cultivated soil for cell seedling according to claim 6, wherein the coated fertilizer is a coated fertilizer obtained by coating fertilizer particles with a coating containing a thermoplastic resin. 8. The soil for cultivating cell seedlings according to claim 6, wherein the coated fertilizer has a time-dissolving function.