JPH09255462A - Culture soil for raising plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote the raising of a plant by mixing a water purifying cake having a specific phosphoric acid absorption coefficient and an available phosphoric acid with a versicular-arbuscular mycorrhizal(VA) fungus and forming the culture soil. SOLUTION: This culture soil for raisin a plant is contained by carrying out the disintegration and particle size selection of a water purifying cake, prepared by treating a sedimented muddy soil produced in a water purifying treating process according to a chemical nonfeeding method and having <=2000mg/100g phosphoric acid absorption coefficient, <=10mg/100g available phosphoric acid content, about 0.1-2.0% total phosphoric acid content and about >=0.3% total nitrogen content into about <=10mm diameter, than adding and mixing the water purifying cake disinfected with chlorine sterilization, etc., with about 5-50vol.% composing material such as a rice straw and about 5-50vol.% soil conditioning material such as coal, subsequently adding and mixing the resultant mixture with a VA fungus belonging to the Gigaspora, etc., in an amount so as to provide >=10 spores, preferably >=100 spores in 1L culture soil for raising the plant. A plant in which the VA fungus can be symbiotic such as a leguminous plant is cultivated in the culture soil for raising the plant to efficiently proliferate the VA fungus and further well grow the plant.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a VA for a purified water cake.
TECHNICAL FIELD The present invention relates to a plant growing soil containing a mixture of mycorrhizal fungi, a plant growing method using the plant growing soil, and a method for growing VA mycorrhizal fungi. More specifically, a plant-cultivating soil, a plant-cultivating method, and a method for multiplying VA mycorrhizal fungi, which uses a combination of a water-purifying cake, which is a soil having a high phosphate absorption coefficient and low effective phosphate, and VA mycorrhizal fungi Regarding the method.

[0002]

2. Description of the Related Art Agricultural utilization of soil produced by a water purification plant or purified water cake is described in detail in "Soil Purification Cake: Characteristics and Problems in Agricultural Utilization" edited by Japan Society of Soil Fertilizers (Hakuyusha). Since polyaluminum chloride or liquid aluminum sulfate is used as a coagulant in the process of water purification, the water purification cake contains a large amount of soluble aluminum, and this active aluminum is the phosphate absorption coefficient of the water purification cake. And lowers the effective phosphoric acid in the water purification cake, thus causing phosphate deficiency in the crop when the water purification cake is used for growing crops. Therefore, in order to use the purified water cake as the soil for growing crops, it is necessary to add more phosphoric acid than the phosphoric acid absorption coefficient.
Therefore, there is a difficulty in using the purified water cake for crop cultivation. Of the soil for growing plants, the soil for greening is generally a mixture of organic and inorganic soil improving materials and fertilizers in the soil subsoil. The growth base material for spraying the slope is a mixture of soil, peat moss, bark compost and the like in an appropriate amount, and is mixed with fertilizer, seeds, agglomerates and the like for construction. Fertilizer used for greening is easily leached due to rainfall, which is one of the causes of environmental pollution such as eutrophication of rivers and lakes. Therefore, it is desired to develop a soil for greening without such environmental pollution.

[0003] On the other hand, VA mycorrhizal fungus is a kind of fungus belonging to algal fungi and forms VA mycorrhiza in many plants. VA mycorrhizal fungus absorbs phosphate and minerals from soil. While supplying the plants with carbohydrates and amino acids necessary for the growth of the bacteria, the plants are symbiotic symbiotic bacteria that maintain a symbiotic relationship with each other. It is generally known that VA mycorrhizal fungi infect various plants, promote the growth of the plants, and improve the disease resistance of the plants. One of the effects is to supply the plant with phosphoric acid fixed in the soil ("Agriculture and Horticulture", Vol. 62, No. 8, P.
930-937, 1987).

However, since VA mycorrhizal fungus is an absolute symbiotic bacterium, it cannot be purely cultivated. Therefore, the VA mycorrhizal fungus is cultivated and propagated for the purpose of growing the plant only by utilizing the symbiotic relationship with the plant. . It is said that it is very difficult to artificially culture VA mycorrhizal fungi, and one of the causes is to grow the host crop vigorously in order to grow VA mycorrhizal fungi. And fertilizer required for the growth of
The growth of A mycorrhizal fungi is inhibited. As a method for growing VA mycorrhizal fungi, a method of mixing a chemical fertilizer (JP-A-3-76572) or a method of using low temperature liquid fertilizer (JP-A-55-118390, JP-A-60-23).
7987, JP 62-19028), a method of absorbing organic fertilizer (JP 63-87973), and a method of using a slow-release fertilizer (JP 6-2076A).
No. 43) is known. These methods have drawbacks in that the preparation of fertilizer components is complicated and that the number of times fertilizer is applied increases according to the growth of plants, which is troublesome.

[0005]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention As a result of intensive studies to solve these conventional problems, the present inventor used VA mycorrhizal fungal purified water cake as a plant growing medium to obtain VA. It was found that the mycorrhizal fungi can be efficiently proliferated and the plants can grow well without applying fertilizers. Therefore, the water purification cake containing VA mycorrhizal fungi is effective as a greening material. The present invention has been completed based on this finding. Therefore, an object of the present invention is a plant-cultivating soil obtained by adding VA mycorrhizal fungi to a water-purified cake, in which VA mycorrhizal fungi grow efficiently and plants grow without applying fertilizers. It is intended to provide a plant cultivation medium that enables the above, a plant cultivation method using the same, and a method for multiplying VA mycorrhizal fungi.

[0006]

The present invention relates to a plant-cultivating soil for mixing purified water cake with VA mycorrhizal fungi. Furthermore, the present invention cultivates a plant in which VA mycorrhizal fungi can co-exist in a plant cultivation medium in which purified water cake is mixed with VA mycorrhizal fungus,
The present invention relates to a method for growing a plant, which comprises cultivating the plant by allowing the mycorrhizal fungus to coexist with the plant to efficiently grow the VA mycorrhizal fungus. Furthermore, the present invention inoculates the VA mycorrhizal fungus into a plant growing soil consisting of a purified water cake, cultivates a plant in which the VA mycorrhizal fungus can co-exist, and causes the VA mycorrhizal fungus to coexist with the plant to generate the VA mycorrhizal fungus. The present invention relates to a plant growing method characterized by efficiently growing and cultivating a plant. Furthermore, the present invention provides a VA mycorrhizal fungus by symbioticly planting the VA mycorrhizal fungus in a plant, and then cultivating the plant infected with the VA mycorrhizal fungus in a plant growing soil consisting of a clean water cake. The present invention relates to a method for growing VA mycorrhizal fungi, which efficiently grows

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The water purification cake used in the present invention is obtained by concentrating and dewatering sedimented mud generated in a water purification process. The purified water cake has a chemical injection treatment in which a chemical such as sulfuric acid or lime or a polymer flocculant is injected in the treatment process, and a non-chemical injection system in which the chemical is concentrated or concentrated / freeze-thaw and then dehydrated. In order to use it as cultivation soil, it is desirable to use purified water cake treated by the chemical-free treatment method. The flocculant used for flocculating the suspended solids in the river water in the step of producing the purified water cake may be polyaluminum chloride or liquid aluminum sulfate. Also,
The dehydration method may be any of natural concentration treatment (sun drying), pressure dehydration, freeze-thaw treatment and the like. Regarding the properties of the purified water cake used in the present invention, it is desirable that the phosphoric acid absorption coefficient is 2000 mg / 100 g or more and the effective phosphoric acid is 10 mg / 100 g or less.
Furthermore, total nitrogen 0.3% or more, total phosphoric acid 0.1-2.0
% Is desirable. In this way, the phosphate absorption coefficient, which indicates the amount of phosphoric acid that is adsorbed and fixed on the soil and cannot be used by plants, is high
And, by using a combination of the purified water cake and VA mycorrhizal fungus, which has a low effective phosphoric acid which indicates the amount of phosphoric acid in the soil that can be utilized by plants, the VA mycorrhizal fungi can be efficiently propagated. It has an excellent effect that the plant grows well.

In the present invention, the purified water cake may be in a form as it is generated, but it is preferably crushed into particles having a diameter of 10 mm or less and sized. Further, it may be dried and granulated. Further, since VA mycorrhizal fungi are easily killed by various bacteria, it is preferable to use a water purification cake that has been sterilized by chlorine sterilization, ozone sterilization, or the like. The water-purifying cake used as the plant growing soil in the present invention may be a single cake, but it is a composting material according to the method of construction,
Soil conditioners may be mixed. When used as soil for planting, the composting material to be mixed may be any of the commonly known composts, and various materials such as rice straw, wheat culm, bark, sawdust, livestock excrement, and municipal waste combo may be deposited naturally or artificially. It may be compost obtained by a conventional method after mechanical treatment. The mixing amount of these composting materials is usually 5 to 50% by volume with respect to the purified water cake, preferably 20 to 30.
% Capacity. The soil improving material to be mixed with the purified water cake may be a plant material such as peat moss, peat or charcoal, or a mineral material such as zeolite, permiculite or perlite. The amount of these soil conditioners mixed is usually 5 to 50% by volume, preferably 10 to 2 with respect to the purified water cake.
It is 5% capacity. When the plant growing soil of the present invention is used as a growth base material for slope greening, an appropriate amount of water-purifying cake, bark compost, peat moss, etc. may be mixed according to the construction method. The amount of purified water cake mixed is usually 10 to 10 in the growth base material.
It is 50% capacity, preferably 15-30% capacity. In addition, in the present invention, Japanese Patent Laid-Open No. 5-219832 discloses that purified water cake is added with phosphorus star as phosphate fertilizer, potassium sulfate as potassium fertilizer, and 2-oxo-4-methyl-6-ureidohexahydropyrimidine as nitrogen fertilizer. The seedling-raising soil described above, or the seedling-raising soil described in JP-A-7-227144 in which phosphoric acid or phosphoric acid and a porous inorganic material are added to a purified water cake containing excess manganese may be used.

Specific examples of the VA mycorrhizal fungi used in the present invention include Scutellospora.
a) Genus, Glomus genus, Gigaspora (G)
genus igaspora, Acaulospo
spora), Sclerocystis (Scleroc)
genus ystis, Entropophora
VA mycorrhizal fungi belonging to the genus Ospora) can be exemplified. Among these VA mycorrhizal fungi, gigaspora (G
VA mycorrhizal fungi belonging to the genus igaspora) are suitable. In particular, Margarita (Margarita of the genus Gigaspora)
VA) mycorrhizal fungi belonging to the species ita) are preferred. Such VA
Mycorrhizal fungi are particularly suitable for use in combination with clean water cakes because they are well grown in soil with low available phosphate. In addition to collecting these VA mycorrhizal fungi from the natural world, a nutrient thin film culture method (JP-A-55-118390) and a method using organ-cultured roots (Japanese Patent Publication No. 62-4).
9037) and the like, or those commercially available in general. Moreover, you may use what culture | cultivated VA mycorrhizal fungi using the purified water cake.

The amount of VA mycorrhizal fungus added to the purified water cake is V
The amount of the mycorrhizal fungus to be able to infect plants may be used, but usually, 1 liter of the plant cultivation medium of the present invention contains 10 or more spores, preferably 100 or more spores. It is good to add to. By cultivating the plant with the plant growing medium of the present invention obtained by mixing the VA mycorrhizal fungus in the purified water cake thus obtained, the VA mycorrhizal fungus grows symbiotically with the plant and efficiently grows in the plant. To grow.

The plants to be cultivated are plants which can coexist with VA mycorrhizal fungi, and include legumes such as soybean, clover, mung bean, peanut, alfalfa, horse mackerel, crow peas, and hagi, witch clover, Sudangrass, Bahiyagrass, guinea grass, grasses such as turf, Sharinbai, roses such as Kodemari, azaleas, azaleas such as Oomurasaki azalea, maple plants such as Japanese maple, asteraceae such as cineraria, mugwort, begonia etc. Includes almost all greening planting plants, such as Gypsophilidae. Cultivation of the plant can be carried out by adopting an ordinary method and is not particularly limited. In particular, if the growth of VA mycorrhizal fungi is taken into consideration, for example, the temperature is 5
It is preferable to cultivate at -40 ° C, especially at 15-30 ° C.

Further, in the present invention, instead of using the plant growing medium containing the VA mycorrhizal fungus in advance in the purified water cake, the plant growing medium consisting of the purified water cake is directly applied and inoculated with the VA mycorrhizal fungus. , It is also possible to grow plants. As described above, the plant-cultivating soil consisting of the purified water cake used in this case may be the purified water cake alone or may be a mixture of the composting material, the soil improving material and the like. The VA mycorrhizal fungus can be applied at the same time when the plant is sown or transplanted to the soil. The inoculation amount of VA mycorrhizal fungi is sufficient to infect plants.

Further, in the present invention, a plant capable of coexisting with VA mycorrhizal fungus is allowed to coexist with VA mycorrhizal fungus, and then a plant infected with VA mycorrhizal fungus is cultivated in a plant growing medium comprising a clean water cake. , VA mycorrhizal fungi can be efficiently propagated. In such a growth method, the method of infecting a plant with VA mycorrhizal fungi is not particularly limited, and the time of execution may be either before or after rooting of the corresponding plant. In particular, seeding, cutting, pretreatment of cuttings, etc., seeding, cutting, the same time as cutting, or at the time of planting seedlings is preferable. In addition, as an implementation method, it is preferable to mix with soil, mix into the root of the plant, stack under the soil, mix into planting holes, and the like. The environment for cultivating the plant that becomes the host of VA mycorrhizal fungi may be in accordance with the existing method, for example, the temperature is 5 to 40 ° C.,
Particularly, 15 to 30 ° C. is preferable.

A sun dried bed can be used as a place for the growth of VA mycorrhizal fungi in the present invention. The sun drying bed is a facility that collects the concentrated settled sludge, which is a purified water cake, in a trout and dries it in the sun. It is possible to dry it to a certain water content (60% or less) in the summer 1.5 ~. Since 2 months and 3 to 6 months in winter are required, a host crop can be cultivated during that period and VA mycorrhizal fungi can be cultivated. More specifically, the following method can be adopted. That is, when the water content of the settled sludge stored in the sun drying bed becomes 80% or less, it is cultivated and the host plant is sown or transplanted. As the host plants, clover, horse mackerel, and barley of the legumes, alfalfa of the grasses, and oak peas are planted alone or several types are mixed. At the start of cultivation of the host crop, VA mycorrhizal fungus (preferably G
(Igaspora, Glomus). Fertilization may be applied without fertilization, but phosphate fertilizer may be added as an ingredient in an amount of 0.01 to 1.0 g / soil 1 liter at the initial stage of cultivation. Cultivation starts in March to April and is completed in August to September. The cultivation can be started earlier by covering with a vinyl film or by heating. Although natural rainfall is used for irrigation, irrigation is performed as appropriate when rainfall is low.

Cultivation of VA mycorrhizal fungi can also be carried out in a greenhouse as follows. Clean water cake 0.5-1
It is packed in a liter capacity pot and seeded or transplanted with a host plant. As a host plant, legumes such as clover, horse mackerel, and hagi, gramineous plants such as alfalfa and corngrass are used. At the start of cultivation of the host crop, VA mycorrhizal fungi (preferably Gigaspora genus, Glomus
(Genus). Fertilization may be applied without fertilization, but phosphate fertilizer may be added as an ingredient in an amount of 0.01 to 1.0 g / soil 1 liter at the initial stage of cultivation. Temperature is 10 to 40 ° C, preferably 20 to
It is maintained at 30 ° C. and watered appropriately. Cultivation is started and completed after 2 months or more.

In the above-mentioned method for growing VA mycorrhizal fungi,
The VA mycorrhizal fungi may be used in an amount enough to infect plants. Especially when growing a large amount of soil, it is advisable to apply the inoculum of VA mycorrhizal fungi at the same time when sowing the host plant.
Propagation of VA mycorrhizal fungi becomes vigorous as the host plant grows, and the substrate to which the proliferated VA mycorrhizal fungi adheres can be used as it is as an inoculum. Usually, when cultivated for 2 months or more, it starts to form spores. When more spores are to be formed, irrigation is stopped and left for a while when the host crop has grown sufficiently. Wet sieving method from this cultivated soil (Tatsuhiko Suzuki, Problems on VA mycorrhiza 5, Agriculture and Horticulture,
Vol. 62, No. 3, P. 28, 1987) and the like, and the spores are separated and collected, and if necessary, a bulking agent and the like may be added to be used as a VA mycorrhizal preparation.

[0017]

As described above in detail, VA is added to the purified water cake.
By cultivating a plant capable of coexisting with VA mycorrhizal fungus in a plant growing soil containing a mixture of mycorrhizal fungi, it becomes possible to grow the plant well. In addition, VA mycorrhizal fungi can be efficiently propagated by cultivating a plant infected with VA mycorrhizal fungi in a plant growing soil consisting of a purified water cake.

[0018]

The present invention will be described in more detail with reference to the following examples. Example 1 As a test soil, a purified water cake (phosphoric acid absorption coefficient 2300 to 2500 mg / 100 g; sieved through a 5 m / m sieve;
Organic phosphoric acid 3-5 mg / 100 g; total nitrogen 0.8-
1.2%; 0.1% to 2.0% total phosphoric acid) mixed with 20% by volume of bark compost (10 to 20 mg / 1 of effective phosphoric acid)
00g), and VA mycorrhizal fungus Gigaspo collected from soil collected from Tsukuba City, Ibaraki Prefecture by wet sieving method.
A mixture of 10 spores of Ra Margarita / l liter of soil was used. As a control, 20% of bark compost was mixed with upland soil collected from Tsukuba City, Ibaraki Prefecture, and IB chemical fertilizer (NPK = 10-10-10) was added at 0.5 g /
The one to which 1 liter of soil was added was used. Fill the 10 liter capacity pot with the test soil and the field soil, 1995
In April 2013, seedlings of Konotegashiwa, Acer palmatum, and Omurasaki azalea were transplanted and sowed. Cultivation was performed in the open field with watering if necessary, and after 6 months, the tree height or the cut grass weight was measured. The results are shown in Table 1.

[0019]

[Table 1] Table 1 ─────────────────────────────────── Test cultivated soil Tree height growth (cm ) Weight of mowed grass (g) Konoteka iwairohamomiji oomurasakitsutsuji noshiba ─────────────────────────────────── Clean water cake 15.0 89.0 18.0 626 Upland 13.0 43.3 12.7 348 ────────────────────────────────────

As is clear from the results shown in Table 1, the plants can be satisfactorily grown by cultivating the plants in a soil containing VA mycorrhizal fungi in a purified water cake.

Example 2 20% by volume of bark compost was mixed with purified water cake having the same characteristics as in Example 1 which had been sifted through a 5 m / m sieve as a test soil, and the wet sieve was obtained from soil collected from Tsukuba City, Ibaraki Prefecture. VA mycorrhizal fungus Gigaspora sp collected by another method
A mixture of 20 spores per liter of soil was used.
As a control, 20% of bark compost was mixed with upland soil collected from Tsukuba City, Ibaraki Prefecture, and IB chemical fertilizer (NPK = 10-
10-10) added with 0.5 g / soil 1 liter was used. A 10-liter capacity pot was filled with each of the test soil and field soil, and in April 1995, seedlings of Konotega wrinkle, Acer palmatum, and Omurasaki azalea were transplanted and sowed. Cultivation was performed in the open field with watering if necessary, and after 6 months, the tree height or the cut grass weight was measured. The results are shown in Table 2.

[0022]

[Table 2] Table 2 ─────────────────────────────────── Test cultivated soil Tree height growth (cm ) Weight of mowed grass (g) Konoteka iwairohamomiji Oomurasaki Tsutsuji Noshiba ──────────────────────────────────── Clean water cake 16.2 85.3 17.8 721 Upland 13.0 43.3 12.7 348 ────────────────────────────────────

As is clear from the results shown in Table 2, the plant can be satisfactorily grown by cultivating the plant in the soil containing the VA mycorrhizal fungus in the purified water cake. Example 3 A water-purified cake having the same characteristics as in Example 1 which was passed through a 5 m / m sieve as a test soil, and a grass soil (particle size 1 to 2).
mm; phosphoric acid absorption coefficient of about 1500 mg / 100 g; effective phosphoric acid 0 to 5 mg / 100 g; total nitrogen 0 to 0.1%;
A phosphoric acid fertilizer was added to each of the phosphoric acid fertilizers in an amount of 0.2 g per liter of soil to 0% to 0.2% of total phosphoric acid).
A 1-liter capacity pot was filled with the test soil and seeded with white clover. VA mycorrhizal fungus Gigaspora collected by wet sieving method from soil collected from Tsukuba City, Ibaraki Prefecture
Ten Margarita spores were inoculated into each test soil during sowing. Cultivate plants while appropriately irrigating them in a glass greenhouse adjusted to an air temperature of 15 to 30 degrees Celsius,
After 3 months, irrigation was stopped and left for 2 weeks. afterwards,
Gigaspora Marga contained in test soil
The number of spores of rita was measured. The results are shown in Table 3.

[0024]

[Table 3] Table 3 ─────────────────────────────────── Test soil Soil Gigaspora Margarita Number of spores ( 1 piece / soil 1 ml) ─────────────────────────────────── Water purification cake 6.67 Grass soil 2 .50 ───────────────────────────────────

From the results shown in Table 3, it can be seen that VA mycorrhizal fungi can be efficiently grown by cultivating a plant infected with VA mycorrhizal fungi in a soil consisting of a purified water cake. Example 4 A purified water cake having the same characteristics as those of Example 3, which was passed through a 5 m / m sieve as a test soil, and a grass soil (particle size: 1 to 2 m).
The phosphoric acid fertilizer added with 0.2 g of phosphoric acid component / 1 liter of soil was used for m). A 1-liter capacity pot was filled with the test soil and seeded with white clover. Spores 10 of VA mycorrhizal fungus Gigaspora sp collected by wet sieving from soil collected from Tsukuba City, Ibaraki Prefecture
Each seed medium was inoculated at the time of sowing. Temperature 15 ~ 3
The plant was cultivated in a glass greenhouse adjusted to 0 degree with appropriate watering, and after 3 months, watering was stopped and left for 2 weeks. After that, Gigas contained in the test soil
The number of spores of Pora sp was measured. The results are shown in Table 4.

[0026]

[Table 4] Table 4 ─────────────────────────────────── Test soil Soil Gigaspora sp Number of spores ( Pieces / soil 1ml) ─────────────────────────────────── Purified water cake 35.5 Turf stains 15 .3 ───────────────────────────────────

From the results shown in Table 4, it is understood that VA mycorrhizal fungi can be efficiently propagated by cultivating a plant infected with VA mycorrhizal fungi in a soil consisting of purified water cake. Example 5 A purified water cake having the same characteristics as those of Example 3, which was passed through a 5 m / m sieve as a test soil, and grass soil (particle size: 1 to 2 m).
The phosphoric acid fertilizer added with 0.2 g of phosphoric acid component / 1 liter of soil was used for m). Falcata (leguminous tree) A filled with test soil in a 10-liter capacity pot
lbizia Falcataria (L.) Fos
b was seeded. VA mycorrhizal fungus Gigaspora Ma collected by wet sieving method from soil collected from Tsukuba City, Ibaraki Prefecture
10 spores of rgarita were inoculated into each test soil during sowing. A plant was cultivated while appropriately irrigating in a glass greenhouse controlled to have an air temperature of 15 to 30 degrees, and after 3 months, irrigation was stopped and left for 2 weeks. After that, Gigaspora Margarit contained in the test soil
The spore number of a was measured. The results are shown in Table 5.

[0028]

[Table 5] Table 5 ─────────────────────────────────── Test soil Soil Gigaspora Margarita Number of spores ( 1 piece / soil 1ml) ─────────────────────────────────── Purified water cake 4.00 Grass soil 1 .10 ───────────────────────────────────

From the results shown in Table 5, it can be seen that VA mycorrhizal fungi can be efficiently propagated by cultivating a plant infected with VA mycorrhizal fungi in a soil consisting of purified water cake.

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] February 14, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location C12N 1/14 C12N 1/14 B // C09K 101: 00

Claims (7)

[Claims] 1. A plant growing soil obtained by mixing a VA mycorrhizal fungus with a purified water cake. 2. The purified water cake has a phosphoric acid absorption coefficient of 200.
0 mg / 100 g or less and effective phosphoric acid is 10 m
The plant cultivation soil according to claim 1, which is g / 100 g or less. 3. The plant cultivation medium according to claim 1, wherein the VA mycorrhizal fungus belongs to the genus Gigaspora. 4. The plant growing soil according to claim 1, wherein 10 liters or more of VA mycorrhizal fungi are mixed in 1 liter of the plant growing soil. 5. A plant capable of coexisting with VA mycorrhizal fungus is cultivated in a plant growing soil obtained by mixing VA mycorrhizal fungus in a purified water cake.
A method for growing a plant, which comprises cultivating a plant by allowing the VA mycorrhizal fungus to coexist with the plant to efficiently grow the VA mycorrhizal fungus. 6. A VA for plant growing soil made of purified water cake
Inoculating the mycorrhizal fungus, cultivating a plant in which the VA mycorrhizal symbiosis is possible, allowing the VA mycorrhizal fungus to symbiosis with the plant to efficiently grow the VA mycorrhizal fungus, and culturing the plant. How to grow plants. 7. A plant capable of coexisting with VA mycorrhizal fungi is allowed to coexist with VA mycorrhizal fungi, and then a plant infected with VA mycorrhizal fungus is cultivated in a plant growing medium consisting of a water-purified cake to obtain V.
A method for growing VA mycorrhizal fungi, which comprises efficiently growing A mycorrhizal fungi.