Fiber module soil for water culture and preparation method thereof

Abstract

The invention discloses fiber module soil for hydroponics and a preparation method thereof, and belongs to the technical field of hydroponics growth matrices, the fiber module soil for hydroponics comprises the following raw materials by mass: 60-75 parts of carbon composite foaming refined stone, 5-10 parts of crop straw, 20-30 parts of natural fiber and 5-8 parts of an adhesive; the raw materials of the carbon composite foaming refined stone comprise foaming refined stone and a carbon source in a mass ratio of 100: (8-12). The carbon composite foaming smelting stone serves as a main material, is light in weight and cannot press plant roots, the porous structure also enables the carbon composite foaming smelting stone to have good water absorption and air permeability, normal growth of hydroponic plants is guaranteed, and the problem that the foaming smelting stone is high in drainage performance and difficult to lock water can be well solved after carbon is compounded. Meanwhile, natural fibers and crop straws are mixed, so that the overall structural stability is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of hydroponic growth substrates, and particularly relates to a fiber module soil for hydroponics and a preparation method thereof. Background Art

[0002] As a soilless cultivation technology, hydroponics mainly meets its growth needs by absorbing minerals and nutrients dissolved in water. Compared with traditional soil cultivation methods, it can provide better control and higher efficiency for plant growth while reducing the impact on the environment.

[0003] Although traditional hydroponic substrates such as perlite, vermiculite and coconut shell fiber have good water retention and aeration properties, they still face some problems in practical applications. For example, although coconut shell fiber is an organic and biodegradable hydroponic substrate, its chemical properties and variability may lead to changes in pH and conductivity, thereby affecting plant growth. In addition, coconut shell fiber, as a natural fiber, degrades quickly, especially in a hydroponic environment, which will greatly affect the durability of the substrate.

[0004] Therefore, it is of great significance to obtain an environmentally friendly, sustainable hydroponic growth mechanism with excellent water retention and air permeability. Summary of the invention

[0005] The object of the present invention is to provide a fiber module soil for hydroponics and a preparation method thereof, so as to obtain an environmentally friendly and sustainable hydroponic growth substrate with excellent water retention and air permeability.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a fiber module soil for hydroponics, comprising the following raw materials in parts by weight:

[0008] 60-75 parts of carbon composite foamed refining stone;

[0009] 5-10 portions of crop straw;

[0010] 20-30 parts of natural fiber;

[0011] 5-8 parts of adhesive;

[0012] The raw materials of the carbon composite foamed refined stone include foamed refined stone and a carbon source in a mass ratio of 100:(8-12).

[0013] Preferably, the particle size of the foamed refined stone is 4 to 10 mm.

[0014] By adopting the above technical solution, the foamed refined stone is a lightweight and porous material, which is full of fine pore structures inside and has good water retention and air permeability. When it is used as a hydroponic growth medium, it can not only maintain an appropriate amount of moisture, but also ensure sufficient air circulation around the roots, so that the roots can obtain sufficient oxygen supply. Compared with other hydroponic growth media, the foamed refined stone has a lower density and a lighter overall mass. During the hydroponic process, it will not oppress the plant roots, and the porous structure is also conducive to the healthy growth of the roots.

[0015] The particle size of the foamed stone plays a key role in the growth of hydroponic plants. Among them, the larger particle size of the foamed stone will lead to a large packing density in the system, and the pore structure formed in the middle will be reduced, which is not conducive to the root growth of hydroponic plants; and when the particle size of the foamed stone is smaller, although it can provide a good pore structure and air permeability, it is easy to be gradually lost due to the scouring of running water during the hydroponic process, resulting in a significant decrease in structural stability. The present invention can improve the stability of small-particle foamed stone in the hydroponic process by directly combining the foamed stone with natural fibers and crop straws, and can also utilize the pore structure of natural fibers. On this basis, the air permeability of the hydroponic growth matrix is ​​improved, and the nutrients of the crop straws themselves can help the root system grow, thereby helping the root system to grow healthily while supporting the root system of the hydroponic plants.

[0016] Foamed stone has a certain water retention, but the drainage of foamed stone is also very strong during long-term use, and the drying speed is fast. During the hydroponic process, the inside of the matrix is ​​easy to lose water, which greatly affects the growth of hydroponic plants. It is necessary to frequently add water during the hydroponic process to maintain a normal growth state. Therefore, the present invention provides a carbon composite foamed stone, and the carbon composited on the foamed stone also has a certain porous structure and good water locking property. Under the joint cooperation of natural fiber and crop straw, the water retention durability of the obtained fiber module soil can be significantly improved, and the inside of the fiber module soil can always be kept moist during the hydroponic process, simplifying the operation steps.

[0017] Preferably, the carbon source is a combination of an organic carbon source and an inorganic carbon source in a mass ratio of (0.7-0.9):(0.1-0.3).

[0018] Preferably, the organic carbon source comprises a combination of one or more of citric acid, polyethylene glycol, polyvinyl alcohol, starch and sucrose.

[0019] Preferably, the inorganic carbon source includes a combination of one or more of graphite and carbon fiber.

[0020] By adopting the above technical scheme, the carbon source of the present invention adopts organic carbon source and inorganic carbon source. The organic carbon source can be better distributed on the surface of the foamed stone, and then a more complex and uniform pore structure is formed inside the foamed stone through roasting. It will also decompose into tiny carbon particles at high temperature, which become adsorption points for water molecules, thereby enhancing the water absorption and water retention capacity of the foamed stone from different aspects, thereby greatly improving the drainage of the foamed stone itself and maintaining the wettability of the roots of the hydroponic fabric; and through carbon recombination, the organic carbon component can also provide nutrients and habitats for microorganisms, regulate the growth environment of hydroponic plants, and promote plant growth.

[0021] Moreover, the carbon source of the present invention also includes an inorganic carbon source. The addition of the inorganic carbon source can coordinate the thermal expansion properties during the carbon composite process, so that the organic carbon source can be better and evenly composited with the foamed refining stone. By adjusting the thermal expansion properties of the carbon, the internal stress caused by roasting can be reduced, the adhesion of the carbon can be improved, and it will not fall off easily, which also improves the structural stability of the obtained carbon composite foamed refining stone.

[0022] Preferably, the carbon composite foamed refining stone is prepared according to the following method:

[0023] The foamed refined stone is immersed in a strong acid aqueous solution for 10 to 15 hours, and the pretreated foamed refined stone is obtained after washing and drying; the pretreated foamed refined stone is dispersed in water, a carbon source and an aminosilane coupling agent are added, the temperature is increased to 50 to 60° C., the mixture is stirred for 1 to 2 hours, and finally the carbon composite foamed refined stone is obtained through drying and calcination.

[0024] Preferably, the strong acid aqueous solution includes one of a hydrochloric acid aqueous solution, a nitric acid aqueous solution and a sulfuric acid aqueous solution with a mass ratio of 20 to 30%.

[0025] Preferably, the solid-to-liquid ratio of the foaming refining stone to the strong acid aqueous solution is 1:(5-7).

[0026] Preferably, the aminosilane coupling agent includes a combination of one or more of γ-aminopropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane and γ-aminopropyltrimethoxysilane; the added amount of the aminosilane coupling agent is 6 to 8% of the mass of the pretreated foamed refining stone.

[0027] By adopting the above technical scheme, the carbon composite foamed stone is pretreated with strong acid before being treated, which can remove impurities and pollutants on the surface of the foamed stone, making its surface purer, and helping to improve the binding force between the organic carbon source and the foamed stone. After acid treatment, the number of active groups on the surface of the foamed stone also increases, promoting chemical bonding with the organic carbon source. Then, under the action of the aminosilane coupling agent, the carbon source and the foamed stone are combined together through chemical bonding, and finally, after high-temperature roasting, the carbon source is converted into tiny carbon particles and compounded on the surface of the foamed stone, thereby improving the water retention of the foamed stone.

[0028] Preferably, the binder is hydroxypropyl methylcellulose.

[0029] By adopting the above technical scheme, the present invention adopts hydroxypropyl methylcellulose as an adhesive to participate in the combination between foamed refined stone and natural fiber. On the one hand, hydroxypropyl methylcellulose is a non-toxic and biodegradable material. Compared with other adhesives, it is green and safe to the human body and the environment, complies with environmental protection principles, reduces potential pollution to the environment, and will not have a large amount of organic residues affecting plant growth.

[0030] On the other hand, hydroxypropyl methylcellulose has good water retention and hygroscopicity, and can form a protective film on the surface of each component of the obtained fiber module soil, effectively reducing water evaporation, greatly improving the drainage of the foamed refining stone, and effectively maintaining the moisture required for the growth of hydroponic plants. Therefore, it can help provide better growth conditions for plant roots and promote the effective absorption of nutrients.

[0031] And as a binder, the large amount of polar groups contained in hydroxypropyl methylcellulose also help to tightly combine with the foamed refining stone, natural fibers and crop straw, thereby enhancing the overall mechanical strength and stability of the obtained fiber module soil. Some foamed refining stones with tiny particle sizes will not be washed away by water during the hydroponic process.

[0032] Preferably, the natural fiber comprises a combination of one or more of coconut shell fiber, wood fiber and flax fiber.

[0033] Preferably, the crop straw includes a combination of one or more of rice straw, wheat straw, corn straw, rape straw and soybean straw.

[0034] By adopting the above technical scheme, on the one hand, the fiber module soil for hydroponics prepared by mixing natural fibers with crop straw and foamed refining stone can greatly improve the overall stability of the obtained fiber module soil. The connection between natural fibers and crop straw can ensure that the foamed refining stone with tiny particles will not be easily washed away. The fiber module soil is more solid and stable and not easily compressed and deformed, which improves the ability of the fiber module soil to resist external pressure, ensures that the plant roots have enough space to expand, and promotes the healthy growth of hydroponic fabrics.

[0035] On the other hand, natural fibers and crop straw can absorb and store a large amount of water, thereby improving the water retention capacity of the entire fiber module soil and further reducing the frequency of irrigation. During the process, crop straw will gradually release essential nutrients such as nitrogen, phosphorus and potassium, becoming a natural fertilizer source available to plants, providing additional nutrients for plants. At the same time, the presence of organic matter is also conducive to the establishment of a good microbial ecosystem, further promoting nutrient circulation.

[0036] In a second aspect, the present invention provides a method for preparing fiber module soil for hydroponics, comprising the following process steps:

[0037] S1. sterilize the natural fibers and crop straw at high temperature and dry them for later use;

[0038] S2. The binder is prepared into an aqueous solution with a mass fraction of 40 to 50%, mixed with carbon composite foamed refining stone, natural fiber and crop straw, and finally compressed to obtain fiber module soil.

[0039] Beneficial effects of the present invention:

[0040] 1. The fiber module soil for hydroponics of the present invention is a kind of hydroponic growth matrix, which can provide good support for plant roots. Carbon composite foamed refining stone is used as the main material. The foamed refining stone is light in weight and will not oppress the plant roots. The porous structure also makes it have good water absorption and air permeability, ensuring the normal growth of hydroponic plants. And the foamed refining stone of the present invention is also compounded with carbon. The addition of carbon can well make up for the problem that the foamed refining stone itself has strong drainage and is difficult to lock water, simplify the cultivation process and significantly improve the durability of the water retention of the fiber module soil. During the hydroponic process, the fiber module soil can always be kept moist inside, which is conducive to the growth of hydroponic plants.

[0041] 2. The present invention also adds natural fiber and crop straw to mix with carbon composite foamed refining stone, which can connect tiny foamed refining stone particles, improve the overall stability of the fiber module soil, make the obtained fiber module soil more solid and stable, ensure sufficient space for plant root system to expand, and natural fiber and crop straw can also absorb and store water, improve the overall water retention capacity, and provide a good environment for plant growth. At the same time, the present invention uses hydroxypropyl methylcellulose as a binder, which is green and environmentally friendly, and also has a certain water retention, effectively reduces water evaporation, and promotes the effective absorption of nutrients. DETAILED DESCRIPTION

[0042] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Preparation Example

[0044] Preparation Example 1: A carbon composite foamed refining stone is prepared according to the following method:

[0045] Take 100g of foamed refined stone (particle size is 4-10mm) and immerse it in 600mL of 30% hydrochloric acid aqueous solution for 12h, wash and dry to obtain pretreated foamed refined stone; take 100g of pretreated foamed refined stone and disperse it in 500mL of water, add 10g of carbon source and 8g of γ-aminopropyltriethoxysilane, wherein the carbon source is a mixture of starch and graphite with a mass ratio of 0.8:0.2, increase the temperature to 60℃, stir and mix for 1h, and finally dry and calcine (calcine at 55℃) to obtain carbon composite foamed refined stone.

[0046] Preparation Example 2, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that the added amount of carbon source is 8g; the added amount of γ-aminopropyltriethoxysilane is 6g.

[0047] Preparation Example 3, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that the amount of carbon source added is 12g.

[0048] Preparation Example 4, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that the carbon source is a mixture of starch and graphite in a mass ratio of 0.9:0.1.

[0049] Preparation Example 5, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that the carbon source is a mixture of starch and graphite in a mass ratio of 0.7:0.3.

[0050] Preparation Example 6, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that the amount of carbon source added is 5g.

[0051] Preparation Example 7, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that the amount of carbon source added is 15g.

[0052] Preparation Example 8, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that an equal amount of starch is used to replace the carbon source obtained by mixing starch and graphite in a mass ratio of 0.8:0.2.

[0053] Preparation Example 9, a carbon composite foamed refining stone, is different from Preparation Example 1 only in that an equal amount of graphite is used to replace the carbon source obtained by mixing starch and graphite in a mass ratio of 0.8:0.2.

[0054] Example

[0055] Example 1, a fiber module soil for hydroponics, is prepared according to the following process steps:

[0056] S1. sterilize the natural fibers and crop straw at high temperature and dry them for later use;

[0057] S2. Prepare 6 parts of hydroxypropyl methylcellulose into a 50% aqueous solution by mass, mix it with 70 parts of the carbon composite foamed refined stone prepared in Preparation Example 1, 25 parts of coconut shell fiber and 8 parts of rice straw, and finally compress it to obtain fiber module soil.

[0058] Example 2, a fiber module soil for hydroponics, is prepared according to the following process steps:

[0059] S1. sterilize the natural fibers and crop straw at high temperature and dry them for later use;

[0060] S2. Prepare 5 parts of hydroxypropyl methylcellulose into a 50% aqueous solution by mass, mix it with 60 parts of the carbon composite foamed refined stone prepared in Preparation Example 1, 20 parts of coconut shell fiber and 10 parts of rice straw, and finally compress it to obtain fiber module soil.

[0061] Example 3, a fiber module soil for hydroponics, is prepared according to the following process steps:

[0062] S1. sterilize the natural fibers and crop straw at high temperature and dry them for later use;

[0063] S2. 8 parts of hydroxypropyl methylcellulose are prepared into a 50% aqueous solution by mass, mixed with 75 parts of the carbon composite foamed refined stone prepared in Preparation Example 1, 30 parts of coconut shell fiber and 5 parts of rice straw, and finally compressed to obtain fiber module soil.

[0064] Example 4, a fiber modular soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced by an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 2.

[0065] Example 5, a fiber modular soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced by an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 3.

[0066] Example 6, a fiber modular soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced by an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 4.

[0067] Example 7, a fiber modular soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced by an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 5.

[0068] Example 8, a fiber modular soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced by an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 8.

[0069] Example 9, a fiber modular soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced with an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 9.

[0070] Comparative Example

[0071] Comparative Example 1, a fiber modular soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced by an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 6.

[0072] Comparative Example 2, a fiber modular soil for hydroponics, differs from Example 1 only in that an equal amount of the carbon composite foamed refined stone prepared in Preparation Example 7 is used to replace the carbon composite foamed refined stone prepared in Preparation Example 1.

[0073] Comparative Example 3, a fiber module soil for hydroponics, is prepared according to the following process steps:

[0074] S1. sterilize the natural fibers and crop straw at high temperature and dry them for later use;

[0075] S2. Prepare 6 parts of hydroxypropyl methylcellulose into a 50% aqueous solution by mass, mix it with 70 parts of foamed stone, 10 parts of graphite, 25 parts of coconut shell fiber and 8 parts of rice straw, and finally compress it to obtain fiber module soil.

[0076] Comparative Example 4, a fiber module soil for hydroponics, is different from Example 1 only in that the carbon composite foamed refined stone prepared in Preparation Example 1 is replaced by an equal amount of foamed refined stone.

[0077] Comparative Example 5, a fiber module soil for hydroponics, is different from Example 1 only in that the amount of foamed refined stone prepared in Preparation Example 1 added is 50 parts.

[0078] Comparative Example 6, a fiber module soil for hydroponics, is different from Example 1 only in that the amount of foamed refined stone prepared in Preparation Example 1 added is 80 parts.

[0079] Comparative Example 7, a fiber module soil for hydroponics, is different from Example 1 only in that no rice straw is added.

[0080] Comparative Example 8, a fiber module soil for hydroponics, is different from Example 1 only in that hydroxypropyl methylcellulose is replaced by an equal amount of styrene-butadiene polymer.

[0081] Comparative Example 9, a fiber module soil for hydroponics, is different from Example 1 only in that no coconut shell fiber is added.

[0082] Performance testing

[0083] The fiber module soil for hydroponics obtained in the examples and comparative examples was cut into samples with a size of 100 cm×20 cm×7 cm, and peppers (Sprinter Fl green bell peppers) were planted hydroponically. The test lasted for 84 days, all of which were natural lighting. The fertilizer used included a concentrated mixture of 160 ppm (16-4-17, 15.5-0-0, 10-0-0), pH 6.3, and EC of about 1200 μS / cm.

[0084] The average fruit fresh weight (g) was recorded after the experiment.

[0085] The experimental results are shown in Table 1:

[0086] Table 1 Fresh weight of pepper fruit

[0087]

[0088] According to Table 1, in combination with Example 1, Example 8 and Example 9, it can be seen that the hydroponic effects of Example 8 and Example 9 are lower than those of Example 1. The reason is that the carbon source in Example 8 does not include an inorganic carbon source. In the preparation process of the carbon composite foamed refined stone, the thermal expansion coefficient of the carbon particles formed by the organic carbon source is somewhat different from that of the foamed refined stone, resulting in the difficulty in compounding the carbon particles and the performance of the formed carbon layer being reduced, thereby reducing the water retention and the hydroponic effect. The carbon source in Example 9 does not include an organic carbon source. The binding force between the carbon source and the foamed refined stone is significantly reduced, the adhesion of the carbon layer is reduced, and it is easy to fall off during use and lose the water retention effect, and the hydroponic effect is reduced.

[0089] Combining Example 1 and Comparative Examples 1 to 4, it can be seen that the hydroponic effect of Comparative Examples 1 to 4 is reduced compared to that of Example 1. The reason is that the amount of carbon source added in Comparative Example 1 is reduced, resulting in a decrease in the content of the carbon layer compounded on the surface of the foamed refining stone, and the water retention performance is reduced accordingly. The root growth environment of the hydroponic plants cannot be well regulated, and the overall stability of the fiber module soil is also reduced, which leads to a decrease in the hydroponic effect of the obtained fiber module soil; in Comparative Example 3, no carbon source is added to compound with the foamed refining stone, and the performance decreases more significantly. In Comparative Example 2, the amount of carbon source added is increased. After roasting and compounding, the excess carbon source will occupy the pores of the foamed refining stone, resulting in a decrease in the air permeability and water absorption of the foamed refining stone, and occupying the growth space of the plant roots, affecting the growth and development of hydroponic plants. In Comparative Example 3, the carbon source and the foamed refining stone are directly mixed. Direct mixing cannot improve the overall stability of the fiber module soil, nor can it be evenly distributed with the foamed refining stone. It cannot directly act on the inside of the foamed refining stone to improve the internal water retention, thereby resulting in a decrease in the hydroponic effect.

[0090] Combining Example 1, Comparative Example 5 and Comparative Example 6, it can be seen that the hydroponic effects of Comparative Examples 5 and 6 are reduced compared to Example 1. The reason is that the amount of carbon composite foamed refining stone added in Comparative Example 5 is reduced, and the air circulation inside the obtained fiber module soil is reduced, the water absorption is reduced, and the support capacity for the roots of hydroponic plants is reduced, so the growth of hydroponic plants is affected, and the hydroponic effect is reduced. In Comparative Example 6, the amount of carbon composite foamed refining stone added is increased, and the large-particle matrix material for the plant roots will oppress the plant roots, affecting the natural and healthy growth of the plant roots, thereby affecting the growth effect of the hydroponic plants.

[0091] In combination with Example 1, Comparative Examples 7 to 9, it can be seen that the hydroponic effects of Comparative Examples 7 to 9 are all reduced compared to Example 1. The reason is that no crop straw is added in Comparative Example 7. On the one hand, the structural support of the foamed refining stone is reduced. On the other hand, the additional supplement of the nutrients of the plant root system by the obtained fiber module soil will be reduced, resulting in a significant decrease in the final fresh weight of the fruit. Conventional adhesives are used in Comparative Example 8. Although they can play a role in enhancing structural stability, the water retention capacity and water absorption are not as good as hydroxypropyl methylcellulose, and the water retention of the foamed refining stone cannot be further coordinated and supplemented, resulting in a decrease in the hydroponic effect, and hydroxypropyl methylcellulose is a natural material, green and environmentally friendly. In Comparative Example 9, no natural fiber is added, and the overall stability of the obtained fiber module soil is significantly reduced, the plant root system does not have enough space to expand, the binding force of the foamed refining stone particles decreases, and it is easy to be washed by water during the hydroponic process, and the supporting effect on the plant root system decreases.

[0092] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0093] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fiber module soil for hydroponics, characterized in that: Including the following raw materials by mass: 60-75 parts of carbon composite foamed refining stone; 5-10 portions of crop straw; 20-30 parts of natural fiber; 5-8 parts of adhesive; The raw materials of the carbon composite foamed refined stone include foamed refined stone and carbon source in a mass ratio of 100:(8-12).

2. The fiber module soil for hydroponics according to claim 1, characterized in that: The particle size of the foamed refined stone is 4 to 10 mm.

3. The fiber module soil for hydroponics according to claim 1, characterized in that: The carbon source is a combination of an organic carbon source and an inorganic carbon source in a mass ratio of (0.7-0.9):(0.1-0.3).

4. The fiber module soil for hydroponics according to claim 3, characterized in that: The organic carbon source comprises a combination of one or more of citric acid, polyethylene glycol, polyvinyl alcohol, starch and sucrose.

5. The fiber module soil for hydroponics according to claim 3, characterized in that: The inorganic carbon source includes one or more of graphite and carbon fiber.

6. The fiber module soil for hydroponics according to claim 1, characterized in that: The carbon composite foamed refining stone is prepared according to the following method: The foamed refined stone is immersed in a strong acid aqueous solution for 10 to 15 hours, and the pretreated foamed refined stone is obtained after washing and drying; the pretreated foamed refined stone is dispersed in water, a carbon source and an aminosilane coupling agent are added, the temperature is increased to 50 to 60° C., the mixture is stirred for 1 to 2 hours, and finally the carbon composite foamed refined stone is obtained through drying and calcination.

7. The fiber module soil for hydroponics according to claim 1, characterized in that: The binder is hydroxypropyl methylcellulose.

8. The fiber module soil for hydroponics according to claim 1, characterized in that: The natural fibers include one or more of coconut shell fibers, wood fibers and flax fibers.

9. The fiber module soil for hydroponics according to claim 1, characterized in that: The crop straws include one or more combinations of rice straws, wheat straws, corn straws, rape straws and soybean straws.

10. A method for preparing fiber module soil for hydroponics according to any one of claims 1 to 9, characterized in that: The process steps include: S1. sterilize the natural fibers and crop straw at high temperature and dry them for later use; S2. The binder is prepared into an aqueous solution with a mass fraction of 40 to 50%, mixed with carbon composite foamed refining stone, natural fiber and crop straw, and finally compressed to obtain fiber module soil.

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