JP6722496B2 - Water repellent inhibitor and culture soil using it - Google Patents

Description

The present invention relates to a water repellent inhibitor used for suppressing water repellency of culture soil and soil, and culture soil using the same.

For various soils such as many nurseries and soils used for cultivation of vegetables, fruit trees, flowers and the like, the density of the soil increases and the water permeability decreases by repeating water supply and drying with the progress of cultivation. Furthermore, soil soil improvers of organic and inorganic substances, fertilizers, culture soils blended with soil, especially organic substances such as peat moss have the water repellency peculiar to dried plant fibrous substances, If the plants are not fully watered, they will run out. As a result, the growth of plants was suppressed, and there were cases where the plants did not grow sufficiently.

The culture soil usually contains about 50% by mass of water, but if a chemical fertilizer is mixed in the culture soil, there is a possibility that the soil may be altered and the original function of the fertilizer may not be exerted. It is desired to reduce the water content in order to reduce the weight in order to reduce the burden on the vehicle and improve the efficiency of transportation.

Conventionally, in order to suppress water repellency of the culture soil, a method of incorporating a surfactant has been proposed (Patent Documents 1 to 18). In these prior arts, the water-repellent effect is specifically verified for those using either an anionic surfactant or a nonionic surfactant alone. As the anionic surfactant, dialkyl sulfosuccinate, sodium alkylnaphthalene sulfonate, sodium alkylbenzene sulfonate, etc. were verified in the examples, and as the nonionic surfactant, polyoxyethylene polyoxypropylene block copolymer, polyoxyalkylene alkyl were used. Examples include ether type such as ether and polyoxyethylene alkylphenyl ether, ester type such as glycerin fatty acid ester, sorbitan fatty acid ester and sucrose fatty acid ester, and ester ether type such as polyethylene glycol fatty acid ester and polyoxyethylene sorbitan fatty acid ester. Has been verified in.

JP-A-53-122508 JP, 06-030654, A JP, 07-000041, A Japanese Patent Laid-Open No. 07-026260 JP-A-08-023768 JP-A-08-130976 Japanese Patent Laid-Open No. 08-157819 JP, 09-074896, A JP-A-10-164975 JP 10-191780 A JP-A-11-215917 JP-A-11-256160 JP, 2003-261872, A JP, 2005-052013, A JP, 2008-092955, A JP, 2005-054880, A JP, 2005-074677, A Re-table 2012-063899

However, since the culture soil is usually transported or stored after production, there is a time lag between the production of the culture soil and its actual use. When used after a period of, the water repellency-inhibiting ability as immediately after production may not be exhibited.

Further, if it is attempted to suppress the water repellency only by using the anionic surfactant, the handling property is deteriorated due to foaming, and there is a possibility that the plant growth such as plant damage and root rot is adversely affected. On the other hand, it is difficult to maintain the water repellency suppressing ability for a long time only with the nonionic surfactant, and it is easy to decompose with the fatty acid ester type nonionic surfactant, and the fatty acid generated by the decomposition may cause the culture soil to be water repellent. It was

The above-mentioned Patent Documents 1 to 18 list various compounds as the ionic surfactants, but all of the specifically disclosed compounds use the anionic surfactant or the nonionic surfactant alone. However, a combination system of surfactants having different ionic properties has not been verified. Furthermore, the reduction of the water content of the culture soil has not been realized because sufficient water permeability has not been obtained.

In addition, among Patent Documents 1 to 18, for example, in Patent Document 1, a polyethylene resin or a urea resin is mixed as an adhesive together with a fiber-based material and a surfactant, and the mat is formed by heating at a temperature equal to or higher than the melting point of these resins. However, the culture soil having a water content of 20 to 60% by mass is not described. Patent Documents 14 and 15 describe artificial culture soil in which a synthetic fiber such as PET resin or polylactic acid resin is used as a culture soil component and a surfactant is mixed, but plants such as peat moss are described. No mention is made of the case of using a fibrous substance having a sex property or other natural inorganic substance as a component of the culture soil.

The present invention has been made in view of the circumstances as described above, has good handleability, and the culture soil and the soil to which this is adhered can be quickly and uniformly watered even if a time lag occurs until it is used. A water repellent inhibitor capable of permeating water, having water permeability, maintaining stable water repellent inhibiting ability for a long period of time, and promoting plant growth, and a culture soil using the same. The challenge is to provide. Another object is to provide a water-repellent inhibitor having permeability and a culture soil using the same, even if the water content of the culture soil is reduced.

In order to solve the above problems, the water repellent inhibitor of the present invention is a water repellent inhibitor used for suppressing water repellent of a culture soil having a water content of 20 to 60% by mass, or soil, Of the anionic surfactant (A) and the nonionic surfactant (B), and the mass ratio represented by (A)/(B) is 0.01 to 5.00:
(A) at least one anionic surfactant selected from sulfonate type and sulfate type; and (B) polyoxyalkylene glycol, polyoxyalkylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene styrenated At least one nonionic surfactant selected from phenyl ether, polyoxyethylene (hardened) castor oil, polyoxyethylene alkylamine, and fatty acid alkanolamide.

The culture soil of the present invention is characterized in that the water repellent inhibitor is attached to the culture soil component and has a water content of 20 to 60% by mass.

According to the water repellent inhibitor of the present invention, the handling property is good, the culture soil and the soil to which it is attached can be quickly and uniformly permeated with water even if a time lag occurs before it is used, It has water permeability and can maintain stable water repellency suppressing ability for a long period of time, and promotes plant growth. Furthermore, it has permeability even if the water content of the culture soil is reduced.

Further, according to the culture soil of the present invention, even if there is a time lag before use, water can be quickly and uniformly permeated, has water permeability, and maintains stable water repellent suppression ability for a long period of time. Can promote the growth of plants. Furthermore, it has permeability even if the water content is reduced.

The present invention will be described in detail below.
(Water repellent inhibitor)
The anionic surfactant (A) used in the water repellent inhibitor of the present invention is at least one anionic surfactant selected from a sulfonate type and a sulfate type.

Examples of the sulfonate-type anionic surfactant include alkyl sulfosuccinate, alkylbenzene sulfonate, and alpha olefin sulfonate. These may be used alone or in combination of two or more.

Examples of the alkyl sulfosuccinate include an alkyl group having an isobutyl group, a pentyl group, a hexyl group, an octyl group, a 2-ethylhexyl group, a decyl group and the like having 4 to 10 carbon atoms, and a cation species such as sodium and potassium. There are certain mono- or dialkyl sulfosuccinates and the like. These may be used alone or in combination of two or more.

Examples of the alkylbenzene sulfonate include those in which the alkyl group is a linear chain having 10 to 18 carbon atoms and the cation species are sodium, potassium and the like. These may be used alone or in combination of two or more.

Examples of the alpha olefin sulfonate include those having an alkenyl group having 12 to 18 carbon atoms and a cation species of sodium, potassium and the like. These may be used alone or in combination of two or more.

Examples of sulfate type anionic surfactants include alkyl sulfate ester salts and alkyl ether sulfate ester salts. These may be used alone or in combination of two or more.

Examples of the alkyl sulfate ester salt include those in which the alkyl group has 12 to 18 carbon atoms and the cation species are sodium, potassium and the like. These may be used alone or in combination of two or more.

The alkyl ether sulfuric acid ester salt is, for example, a salt of polyoxyethylene alkyl ether sulfuric acid obtained by sulfuric acid esterification of a higher alcohol having 12 to 18 carbon atoms with ethylene oxide (EO), and the cationic species is sodium. , Potassium and the like. These may be used alone or in combination of two or more.

The nonionic surfactant (B) used in the water repellent inhibitor of the present invention is polyoxyalkylene glycol, polyoxyalkylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene styrenated phenyl ether, polyoxyethylene ( Hardened) At least one nonionic surfactant selected from castor oil, polyoxyethylene alkylamine, and fatty acid alkanolamide.

Examples of polyoxyalkylene glycols include polyethylene glycol, polypropylene glycol, and polypropylene glycol ethylene oxide adducts. Among these, polypropylene glycol ethylene oxide adduct is preferable, and the ethylene oxide content is more preferably 40% or less, and for example, ethylene glycol 3 to 30 mol addition of polypropylene glycol, which is a propylene oxide 25 to 35 mol adduct. Things etc. are mentioned. These may be used alone or in combination of two or more.

Examples of polyoxyalkylene alkyl ethers include propylene oxide and/or ethylene oxide adducts of linear or branched alcohols having 12 to 18 carbon atoms. Among these, a propylene oxide 2 to 10 mol addition product of a straight or branched chain alcohol having 12 to 18 carbon atoms, and an ethylene oxide 2 to 10 mol addition product of a straight or branched chain alcohol having 12 to 18 carbon atoms And random or block adducts of 2 to 15 mol of ethylene oxide and 2 to 15 mol of propylene oxide of a linear or branched alcohol having 12 to 18 carbon atoms are preferable. In the case of a block addition product, a terminal ethylene oxide addition product is preferable from the viewpoint of the effect of emulsification and dispersion. These may be used alone or in combination of two or more.

In particular, the polyoxyalkylene glycol and the polyoxyalkylene alkyl ether, which are the nonionic surfactant (B), are preferably those having an HLB of 8 or less from the viewpoint of handling property such as foaming and water repellency suppressing ability.

Here, HLB (hydrophilic/lipophilic balance) indicates the molecular weight of the hydrophilic group portion in the total molecular weight of the surfactant, and HLB of the polyoxyalkylene nonionic surfactant is the following griffin (Griffin). ) Is obtained. In addition, in the case of a propylene oxide single adduct, the HLB value is 0.
HLB value = E/5
E:% by mass of polyoxyethylene portion contained in the surfactant molecule
As the polyoxyethylene alkylphenyl ether, an ethylene oxide adduct of 3 to 50 mol of an alkylphenol having 8 to 12 carbon atoms is preferable, an ethylene oxide 5 to 20 mol adduct of octylphenol, and an ethylene oxide 5 to 20 mol adduct of nonylphenol. Is more preferable. These may be used alone or in combination of two or more.

Examples of polyoxyethylene styrenated phenyl ethers include (mono, di, tri) styrenated phenol of 3 to 50 mol of ethylene oxide adduct. These may be used alone or in combination of two or more.

The polyoxyethylene (hardened) castor oil is preferably castor oil or a hydrogenated castor oil with 10 to 60 mol of ethylene oxide adduct. These may be used alone or in combination of two or more.

Examples of the polyoxyethylene alkylamine include aliphatic primary amine (linear or branched C12-18 carbon chain) ethylene oxide 2-20 mol adduct. These may be used alone or in combination of two or more.

Examples of the fatty acid alkanolamide include lauric acid diethanolamide, palmitic acid diethanolamide, myristic acid diethanolamide, stearic acid diethanolamide, oleic acid diethanolamide, palm oil fatty acid diethanolamide, and coconut oil fatty acid diethanolamide. These may be used alone or in combination of two or more.

The water-repellent inhibitor of the present invention contains, in addition to the anionic surfactant (A) and the nonionic surfactant (B), a monohydric alcohol having 1 to 8 carbon atoms, a dihydric alcohol having 1 to 8 carbon atoms, It is preferable to contain at least one alcohol (C) selected from a trihydric alcohol having 1 to 8 carbon atoms and an alkoxy alcohol having 2 to 8 carbon atoms.

Of the above alcohols (C), examples of monohydric alcohols having 1 to 8 carbon atoms include methanol, ethanol, propanol, butanol, isopropanol, isobutanol, pentanol, 2-methyl-2-butanol, hexanol, and methyl pen. Examples thereof include tanol, dimethylbutanol, 2-ethylbutanol, heptanol, octanol and 2-ethylhexanol. These may be used alone or in combination of two or more.

Examples of the dihydric alcohol having 1 to 8 carbon atoms include methanediol, ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,2-pentanediol, 1,4-pentanediol and 1,2. 5-pentanediol, 3-methyl-1,3-butanediol, 2,2-dimethyl-1,3-propanediol, 1,2-hexanediol, 1,6-hexanediol, 1,2-octanediol, 1,8-octanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol and the like can be mentioned. These may be used alone or in combination of two or more.

Examples of the trihydric alcohol having 1 to 8 carbon atoms include glycerin and the like.

Examples of the alkoxy alcohol having 2 to 8 carbon atoms include 2-methoxyethanol, 2-ethoxyethanol, 2-(n-propoxy)ethanol, 2-isopropoxy-1-ethanol, 3-(n-propoxy)ethanol, 2-(n-butoxy)ethanol, 2-(2-methoxyethoxy)ethanol, 1-methoxy-2-propanol, 1-methoxy-2-butanol, 3-methoxy-1-butanol, 4-methoxy-1-butanol , 1-ethoxy-2-propanol, 3-methoxy-3-methyl-1-butanol and the like. These may be used alone or in combination of two or more.

Among the alcohols (C) exemplified above, the water-repellent inhibitor of the present invention is preferably an alkoxy alcohol having 2 to 8 carbon atoms.

In the water repellent inhibitor of the present invention, the mass ratio represented by (A)/(B) of the anionic surfactant (A) and the nonionic surfactant (B) is 0.01 to 5.00, and preferably Is 0.1 to 0.8. When an alcohol (C) is added to the water repellent inhibitor of the present invention, the anionic surfactant (A), the nonionic surfactant (B) and the alcohol (C) (C)/((A)+( The mass ratio represented by B)) is preferably 0.01 to 0.25, and more preferably 0.03 to 0.20.

By blending the anionic surfactant (A), the nonionic surfactant (B) and the alcohol (C) in such a mass ratio, a water repellent inhibitor having a desired effect can be obtained. Since the anionic surfactant (A) has good water permeability, it can maintain the water repellency suppressing ability for a long time, and the nonionic surfactant (B) has good water permeability, Since water permeability is dramatically improved when used in combination with (A), water can reach deep into the roots of plants and promote growth, and alcohol (C) promotes the speed of inundation of the culture soil. You can

Further, the water repellent inhibitor of the present invention is obtained by adjusting the mass ratio (A)/(B) of the anionic surfactant (A) and the nonionic surfactant (B) within the above range. Foaming is suppressed when (A) is mixed and dissolved in water. Further, when the anionic surfactant (A) and the nonionic surfactant (B) are mixed and dissolved in water, thickening and gel formation may occur, so that they can adhere well to the culture soil. Conceivable. Therefore, it is considered that it has excellent water permeability, can maintain the ability to suppress water repellency for a long period of time, and suppresses growth inhibition due to the anionic surfactant (A).

The content of the anionic surfactant (A), the nonionic surfactant (B) and the alcohol (C) in the water repellent inhibitor of the present invention is not particularly limited, but the content of the anionic surfactant (A) is not limited. 1-50 mass% is preferable, and, as for content, 5-20 mass% is more preferable. The content of the nonionic surfactant (B) is preferably 10 to 90% by mass, more preferably 25 to 75% by mass. When the alcohol (C) is added, its content is preferably 1 to 20% by mass, more preferably 5 to 15% by mass.

The water repellent inhibitor of the present invention can be used by adding water in addition to the anionic surfactant (A), the nonionic surfactant (B) and the alcohol (C). When water (B) is blended with the water repellent inhibitor of the present invention, an alcohol (C) is blended, and when the anionic surfactant (A) and the nonionic surfactant (B) are mixed and dissolved in water, thickening and gelation occur. It also functions as a state-conditioning agent that suppresses the occurrence of oxidization, and can impart good handleability.

The water repellent inhibitor of the present invention includes an anionic surfactant other than (A) above, a nonionic surfactant other than (B) above, a cationic surfactant, and an amphoteric interface within a range that does not impair the effects of the present invention. Activators, salts, defoamers, thickeners, thickeners, bactericides, solvents, fragrances, colorants, pH adjustors, fertilizers such as nutrient sources and minerals can be added.

The water-repellent inhibitor of the present invention can be used for water-repellent inhibition of a culture soil having a water content of 20 to 60% by mass, and the culture soil and the soil to which the water-repellent agent is attached have a time lag before being used. Even if it occurs, it can quickly and uniformly permeate water, has water permeability, can maintain a stable water repellency suppressing ability for a long period of time, and can promote the growth of plants. If the water content of the culture soil is less than 20% by mass, it becomes difficult to suppress water repellency, and if it is more than 60% by mass, there is a risk of generation of bacteria and spoilage. Furthermore, the water repellent inhibitor of the present invention can exhibit permeability even if the water content of the culture soil is reduced. That is, the culture soil usually contains about 50% by mass of water, but by incorporating the water repellent inhibitor of the present invention, water permeation can be achieved even if the content is reduced to 20% by mass or more and less than 40% by mass. A culture soil having a property is obtained. Therefore, even if a chemical fertilizer is added to the culture soil, the original function of the fertilizer can be exerted without deterioration and the weight can be reduced, so that the burden on the elderly work and the efficiency of transportation can be improved. You can

Furthermore, the water-repellent inhibitor of the present invention can be used also for water-repellent inhibition of soil, and can be sprayed directly on the surface of the land (soil) to be planted, or can be mixed in the soil in a small amount to have a water-repellent inhibitory effect. Can be demonstrated.

(Culture soil)
The culture soil of the present invention is one in which the water repellent inhibitor of the present invention is attached to the culture soil component and has a water content of 20 to 60 mass %. By attaching the water repellent inhibitor of the present invention to the culture soil component, water can be quickly and uniformly permeated even if there is a time lag before use, and it has water permeability and is stable for a long period of time. The ability to suppress water repellency can be maintained and the growth of plants can be promoted. Furthermore, it has permeability even if the water content is reduced.

In the culture soil of the present invention, the adhesion amount of the water repellent inhibitor of the present invention is calculated by converting the effective content (the total amount of the anionic surfactant (A), the nonionic surfactant (B) and the alcohol (C)). It is preferably 0.01 to 10 parts by mass, and more preferably 0.01 to 5 parts by mass, relative to 100 parts by mass of the soil component.

As a method for attaching the water repellent inhibitor of the present invention to the culture soil component, a method usually used for attaching an additive for suppressing water repellency to the culture soil component can be appropriately adopted. That is, when the water repellent inhibitor of the present invention is a liquid at room temperature, it can be used as a stock solution, and when it is a solid or paste at room temperature, it can be heated and melted to be used as a liquid, or it can be mixed with water. Further, the water repellent inhibitor of the present invention can be used as an aqueous solution. The water repellent of the present invention is applied to the culture soil component by applying the water repellent inhibitor of the present invention in these forms to the culture soil component by spraying or by immersing the culture soil component in the water repellent inhibitor of the present invention. Inhibitors can be attached. As the water repellent inhibitor of the present invention, it is preferable to use an aqueous solution mixed with water from the viewpoints of handling property and uniform adhesion to the culture soil component, and an excess amount obtained by performing a drying treatment after the treatment to the culture soil component. You may remove the water.

In the culture soil of the present invention, the culture soil component to be used is not particularly limited as long as it is usually used as culture soil, for example, a plant fibrous substance, an inorganic substance having a porous structure, Inorganic substances having a non-porous structure, fertilizers, soil and the like can be mentioned. These may be used alone or in combination of two or more.

The culture soil of the present invention preferably contains at least one selected from the following (i) to (iii) as a component of the culture soil from the viewpoint that the effect of the present invention is remarkably exhibited:
(I) at least one plant fibrous substance selected from peat moss, coconut husk, chaff, sawdust, bamboo powder, bagasse, peat, and grass peat;
(Ii) at least one inorganic substance having a porous structure selected from vermiculite, attapulgite, diatomaceous earth, sepiolite, zeolite, and perlite;
(Iii) At least one inorganic substance having a non-porous structure selected from silica sand, sea sand, alumina sand, talc, and calcium carbonate.

Examples of fertilizers for culture soil components include nitrogen fertilizers, phosphate fertilizers, potassium fertilizers, calcium compounds such as calcium hydroxide, magnesium compounds such as magnesium hydroxide, zinc compounds such as zinc oxide, and the like. These may be used alone or in combination of two or more.

Examples of the soil of the culture soil component include natural soils such as Kuroboku soil, Akatama soil, Kanuma soil, Hyuga soil, and rice soil. These may be used alone or in combination of two or more.

The culture soil of the present invention is obtained by adhering the water repellent inhibitor of the present invention to at least one of the culture soil components, and among the culture soil components, a vegetable fibrous substance, an inorganic substance having a porous structure. It is preferable that the culture soil has the water repellent inhibitor of the present invention adhered to at least one selected from the following, and an inorganic substance having a non-porous structure. For example, a plant fibrous substance to which the water repellent inhibitor of the present invention is attached is mixed with an inorganic substance having a porous structure, an inorganic substance having a non-porous structure, a fertilizer, soil or the like to prepare a culture soil. One of such culture soil components, to which the water repellent inhibitor of the present invention is attached, is mixed with another culture soil component to which the water repellent inhibitor of the present invention is not attached, and the present invention Even if it is used as a culture soil, the water-repellent effect can be exhibited.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples. The blending amounts shown in Tables 1 and 2 are parts by mass.
<Preparation of water repellent inhibitor>
The water repellent inhibitor was obtained by mixing and stirring various components shown in Tables 1 and 2 at room temperature.

<Production of culture soil>
With respect to the culture soil components shown in Tables 1 and 2, and 100 parts by weight of the culture soil mixed and stirred in the mass ratio, the effective amount of the water repellent inhibitor shown in Tables 1 and 2 (mass parts) and the culture soil. The water-repellent inhibitor was appropriately dissolved or diluted with water so that the water content was moderate, and the mixture was stirred while spraying to produce a culture soil to which the water-repellent inhibitor was attached.

When the water repellent inhibitor was dissolved or diluted with water, the handling properties of thickening/gelling and foaming of the diluted aqueous solution were observed and evaluated in three grades of ◯: good, Δ: rather poor, and x: poor. The results are shown in Tables 1 and 2.

In addition, the culture soil after 120 days of production was obtained by filling a plastic bag with the culture soil after the production, sealing it, and storing it at 30°C. In addition, the notation (after) in Table 2 was used as a mixture of the culture soil component after 120 days of production without attaching the water repellent inhibitor to the culture soil component.

<Inundation speed>
A cell tray (30 squares, 128 holes) standardized by the Ministry of Agriculture was filled with a fixed amount of culture soil using a seeding machine, spread, and then a fixed amount of water was irrigated. Regarding the time until the water is submerged in the culture soil (the state where the water does not float), it is observed in four stages of ◎: within 3 seconds, ○: within 5 seconds, △: within 10 seconds, ×: over 20 seconds. evaluated. The results are shown in Tables 1 and 2.
The 50th time is the evaluation result on the 50th day after irrigating a fixed amount once a day.

<Water permeability>
A cell tray (30 squares, 128 holes) standardized by the Ministry of Agriculture was filled with a fixed amount of culture soil using a seeding machine, spread, and then a fixed amount of water was irrigated. After 1 minute of irrigation, excavate the culture soil with a spatula, and observe the water permeability of the whole in four stages: ◎: 90% or more, ○: 70% or more, △: 50% or more, ×: 30% or less. did. The results are shown in Tables 1 and 2.
The 50th time is the evaluation result on the 50th day after irrigating a fixed amount once a day.

<Growth>
A Ministry of Agriculture, Forestry and Fisheries standard cell tray (30 squares, 128 holes) is filled with a certain amount of culture soil using a seeding machine, and after spreading, one seed of Komatsuna seeds is sown again using the seeding machine, one seed at a time, and fixed. The soil was covered with a certain amount of culture soil, and a certain amount was irrigated to complete the seeding work. After sowing, a certain amount of water is irrigated once a day to raise seedlings, and after 7 days, the germination rate, rooting status, and cotyledon development status are observed in three stages: ○: good, △: somewhat poor, ×: poor. evaluated. The results are shown in Tables 1 and 2.

Claims (3)

A water repellent inhibitor used so that the water content of the culture soil or soil after treatment with the water repellent treatment agent is 20 to 60% by mass , which comprises the following anionic surfactant (A) and nonionic surfactant: Containing an agent (B) and an alcohol (C) ,
The alcohol (C) is at least selected from a monohydric alcohol having 1 to 8 carbon atoms, a dihydric alcohol having 1 to 8 carbon atoms, a trihydric alcohol having 1 to 8 carbon atoms, and an alkoxy alcohol having 2 to 8 carbon atoms. One kind,
Water repellent inhibitor having a mass ratio represented by (A)/(B) of 0.01 to 5.00:
(A) at least one anionic surfactant selected from sulfonate type and sulfate type; and (B) polyoxyalkylene glycol, polyoxyalkylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene styrenated At least one nonionic surfactant selected from phenyl ether, polyoxyethylene (hardened) castor oil, polyoxyethylene alkylamine, and fatty acid alkanolamide. A culture soil in which the water repellent inhibitor according to claim 1 is attached to a culture soil component, and the water content is 20 to 60 mass % . The culture soil according to claim 2, containing at least one selected from the following (i) to (iii) as a culture soil component:
(I) at least one plant fibrous substance selected from peat moss, coconut husk, chaff, sawdust, bamboo powder, bagasse, peat, and grass peat;
(Ii) at least one inorganic substance having a porous structure selected from vermiculite, attapulgite, diatomaceous earth, sepiolite, zeolite, and perlite;
(Iii) At least one inorganic substance having a non-porous structure selected from silica sand, sea sand, alumina sand, talc, and calcium carbonate .