Agricultural fiber material containing strontium and zinc elements and preparation method thereof

Abstract

The present invention provides an agricultural fiber material containing strontium and zinc elements, the components of which specifically include SiO 2 ,MgO,CaO,Al 2 O 3 , K 2 O, SrO and ZnO; the present application also provides a method for preparing an agricultural fiber material containing strontium and zinc elements, which prepares the agricultural fiber material by artificial intervention, melting, fiberizing and heat treating natural ore. The agricultural fiber material provided by the present application can promote the growth of plant roots by adjusting the main elements and trace elements; on the other hand, organic adhesives / binding agents and other substances are not used in the preparation process, and will not be further absorbed by plants due to the presence of organic adhesives / binding agents, thereby not causing damage to the human body.

Description

Technical Field

[0001] The invention relates to the technical field of fiber materials, and in particular to an agricultural fiber material containing strontium and zinc elements and a preparation method thereof. Background Art

[0002] At present, inorganic fibers in agriculture are only used as substrates, without considering the harmful effects of the fibers themselves on the soil and the role of promoting plant absorption and growth. At the same time, the production of inorganic fibers only considers their temperature resistance and practicality in the industrial field, without considering costs and environmental solubility. However, their high melting temperature increases costs.

[0003] Furthermore, in the prior art, products that use inorganic fiber materials as culture media all require the addition of substances such as organic adhesives / binders, but these organic adhesives / binders contain toxic substances such as phenol and formaldehyde that are harmful to the soil, causing lasting damage to the soil, and these organic adhesives / binders will be further absorbed by plants and may then be absorbed by the human body, causing permanent damage to the human body. Summary of the invention

[0004] The technical problem solved by the present invention is to provide an agricultural fiber material containing strontium and zinc elements, which is beneficial to the growth of plant roots and does not cause harm to the human body.

[0005] In view of this, the present application provides an agricultural fiber material containing strontium and zinc elements, comprising:

[0006]

[0007] Preferably, the molar ratio of O / Si in the agricultural fiber material is (1.8-2.8):1.

[0008] Preferably, the total amount of the SrO and the ZnO is 0.6-3.5 wt %.

[0009] Preferably, the content of SrO is 0.6-1.5wt%, the content of ZnO is 0.03-2wt%, the total amount of SrO and ZnO is 0.7-3.0wt%, the molar ratio of O / Si in the agricultural fiber material is (1.9-2.6):1, the content of SiO2 is 58-72wt%, the content of MgO is 0.8-6wt%, the content of CaO is 22-29wt%, and the content of K2O is 0.7-2wt%.

[0010] Preferably, the average diameter of the agricultural fiber material is 3.0-4.2 μm, fibers with a diameter of 1-2 μm account for 15-20 wt%, fibers with a diameter of 2-3 μm account for 50-75 wt%, fibers with a diameter of 3-4 μm account for 15-25 wt%, and fibers with a diameter of 4-5 μm account for 0-5 wt%.

[0011] Preferably, the bulk density of the agricultural fiber material is 48 to 160 kg / m 3 .

[0012] Preferably, the porosity of the agricultural fiber material is 50-90%.

[0013] Preferably, the water retention rate of the agricultural fiber material is 100-1000%, and the thermal conductivity is 0.03-0.06 W / mK.

[0014] The present application provides a method for preparing the agricultural fiber material, comprising the following steps:

[0015] A silicon-containing raw material, a magnesium-containing raw material, a calcium-containing raw material, an aluminum-containing raw material, a potassium-containing raw material, a strontium-containing raw material and a zinc-containing raw material are mixed according to a proportion, and melted to obtain a melt;

[0016] The melt is fiberized and then heat treated to obtain agricultural fiber material.

[0017] Preferably, the melting temperature is 1400-2200° C., the fiber-forming method is spinning, the fiber-forming temperature is 1500-1600° C., and the spinning line speed is 150-200 m / s.

[0018] The present application provides an agricultural fiber material containing strontium and zinc elements, and its components specifically include SiO2, MgO, CaO, Al2O3, K2O, SrO and ZnO; the agricultural fiber material provided by the present application releases effective silicon, calcium, magnesium and other elements required for plant growth, and its fiber structure gradually changes during use, thereby making the soil loose and breathable, which is conducive to the growth of plant roots. At the same time, due to its biological solubility, it can also provide zinc, strontium and other elements required for the growth of different plants; further, the thermal conductivity of the agricultural fiber material is 0.03-0.06W / mK (average 25°C), with good warmth retention, root warmth, which is conducive to plant absorption of trace elements and promotion of root growth; it also has good water retention, fertilizer retention and breathability; at the same time, the agricultural fiber has a large specific surface area and high fiber solubility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a SEM photo of the agricultural fiber material containing strontium and zinc elements of the present invention;

[0020] Figure 2This is a SEM photo of the surface defects of the agricultural fiber material containing strontium and zinc elements of the present invention;

[0021] Figure 3 This is a SEM photograph of the surface defects of the agricultural fiber material containing strontium and zinc elements of the present invention after dissolution;

[0022] Figure 4 This is a SEM photograph of the surface of the agricultural fiber material containing strontium and zinc elements after dissolution according to the present invention. DETAILED DESCRIPTION

[0023] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the present invention.

[0024] In view of the problem that organic adhesives / binding agents in agricultural fiber materials in the prior art are absorbed by plants and cause harm to the human body, the present application provides an agricultural fiber material containing strontium and zinc elements. The agricultural fiber material is adjusted according to the main elements or trace elements required by crops. Without adding organic adhesives / binding agents, the agricultural fiber material is still conducive to improving the absorption capacity of plant roots, and also has the advantages of water retention, fertilizer retention and air permeability. Specifically, the embodiment of the present invention discloses an agricultural fiber material containing strontium and zinc elements, including:

[0025]

[0026] In the agricultural fiber material containing strontium and zinc elements provided in the present application, the introduction of ZnO, SrO, and K2O can reduce the melting temperature of the raw material melt during the melting process by 1800 to 2000°C, so that it can melt at a temperature lower than 1400 to 1800°C; and the introduction of appropriate amounts of ZnO, SrO, and K2O oxides can increase the fiber defects (such as Figure 1 , Figure 2 ), while promoting the effective dissolution of fibers in the soil (as shown Figure 3 , Figure 4As shown), the content of effective Zn, effective Sr, effective Ca and effective Mg in the soil is increased, and the root absorption capacity of plants or crops is increased, thereby improving the yield and quality of crops. Specifically, the content of ZnO is 0.02-3wt%, more specifically, the content of ZnO is 0.03-2wt%, more specifically, the content of ZnO is 0.5-1.5wt%. The content of SrO is 0.5-2wt%, more specifically, the content of SrO is 0.6-1.5wt%, more specifically, the content of SrO is 0.8-1.2wt%. The content of K2O is 0.6-3wt%, more specifically, the content of K2O is 0.8-2.5wt%, more specifically, the content of K2O is 1.0-2.0wt%.

[0027] In the present application, the total weight of SrO+ZnO is controlled at 0.6-3.5wt%, which can control the amount of SrO and ZnO in the fiber and help plants to effectively absorb potassium, calcium, magnesium and silicon. More specifically, the total amount of SrO and ZnO is 0.7-3.0wt%, and more specifically, the total amount of SrO and ZnO is 1.0-2.5wt%.

[0028] The content of SiO2 is 55 to 75 wt%, more specifically, the content of SiO2 is 58 to 72 wt%, more specifically, the content of SiO2 is 60 to 70 wt%.

[0029] The content of MgO is 0.6-7wt%; more specifically, the content of MgO is 0.8-6wt%; more specifically, the content of MgO is 1.5-4.5wt%.

[0030] The content of Al2O3 is less than 1 wt%, more specifically, the content of Al2O3 is 0.3-0.6 wt%.

[0031] The content of CaO is 20 to 32 wt %, more specifically, the content of CaO is 22 to 29 wt %, more specifically, the content of CaO is 24 to 28 wt %.

[0032] In the agricultural fiber material provided in the present application, the O / Si molar ratio is (1.8-2.8):1, which can effectively control the fiber quality during the fiber-forming process and improve the diameter stability of the fiber during the fiber-forming process; wherein, if the O / Si molar ratio is too high, the fiber quality distribution will be uneven, and if the O / Si molar ratio is too low, the fiber diameter (>4μm) will be large and cannot meet the actual application needs of agriculture; more specifically, the O / Si molar ratio is (1.9-2.6):1.

[0033] The present application also provides a method for preparing agricultural fiber materials, comprising the following steps:

[0034] A silicon-containing raw material, a magnesium-containing raw material, a calcium-containing raw material, an aluminum-containing raw material, a potassium-containing raw material, a strontium-containing raw material and a zinc-containing raw material are mixed according to a proportion, and melted to obtain a melt;

[0035] The melt is fiberized and then heat treated to obtain agricultural fiber material.

[0036] In the present application, the Si-containing raw material is selected from silica, quartz sand or other silicon-containing minerals; the Mg-containing raw material is fused magnesia, light-burned magnesia, light-burned or heavy-burned dolomite, forsterite or other magnesium-containing minerals; the Ca-containing raw material is lime, light-burned or heavy-burned dolomite, wollastonite or other calcium-containing minerals; the Zn-containing raw material can be zinc oxide (ZnO), zinc carbonate (ZnCO3), smithsonite or other zinc-containing minerals; the Sr-containing raw material is strontium hydroxide, strontium carbonate, strontianite or other strontium-containing minerals; the K-containing raw material is potassium carbonate, potassium bicarbonate or other potassium-containing minerals; the Al-containing raw material is industrial alumina, calcined alumina or aluminum-containing minerals.

[0037] After the raw materials are mixed, they are melted at a temperature of 1400 to 2200°C, more specifically, at a temperature of 1400 to 1800°C.

[0038] According to the present invention, the melt obtained by melting is then formed into a fibrous material by spinning or blowing; in a specific embodiment, the fiber-forming method is spinning, the fiber-forming temperature is 1500-1600°C, and the spinning line speed is 150-200m / s.

[0039] The present application finally heat-treats the fiberized material to obtain the agricultural fiber material.

[0040] The agricultural fiber material provided by the present application is a natural ore that is melted and then fiberized to accelerate the process from rock to soil. In addition, the structural defects that appear in the fiberization process accelerate the biological solubility of the fiber in the soil. The fiber will dissolve, peel and pulverize during use, releasing effective silicon, calcium, magnesium and other elements required for plant growth. During use, its fiber structure gradually changes, thereby making the soil loose and breathable, which is conducive to the development of plant roots. At the same time, due to its biological solubility, it can also provide zinc, strontium and other elements required for the growth of different plants.

[0041] The average diameter of the fiber material prepared in the present application is 3.0-4.2 μm, fibers with a diameter of 1-2 μm account for 15-20wt%, fibers with a diameter of 2-3 μm account for 50-75wt%, fibers with a diameter of 3-4 μm account for 15-25wt%, and fibers with a diameter of 4-5 μm account for 0-5wt%. Among them, if the proportion of fibers with a diameter of 4-5 μm is large, the bulk density of the fiber product is relatively large, the air permeability is poor, and the water absorption rate is reduced.

[0042] The contents of effective strontium, effective zinc, effective calcium, effective magnesium, effective silicon and effective potassium in the fiber material are 0.6-4 mg / kg, 1-6 mg / kg, 20-500 mg / kg; 10-100 mg / kg, 50-500 mg / kg, 20-200 mg / kg respectively. The test method for effective zinc shall be in accordance with the "GB7880-1987 Determination of Effective Zinc in Forest Soil", the test method for effective strontium shall be in accordance with the "Inductively Coupled Plasma Photometric Emission Spectrometry (ICP-OES) Method", the test method for effective silicon shall be in accordance with the "NY / T 1121.15-2006 Soil Testing Series Standards", and the test methods for effective calcium and magnesium shall be in accordance with the "LY / T 2445-2015 Technical Specifications for Topsoil Protection for Greening".

[0043] The bulk density of fiber materials is 48~160kg / m 3 , need to reach 48kg / m 3 To maintain the water and fertilizer needs of plant-level crops; if the bulk density is too low, it will be detrimental to water retention and the ability to support plant growth.

[0044] The porosity of the fiber material is 50-90%; it has porous properties so as to provide sufficient water and air for the germination and root growth of plants in the growth medium.

[0045] The water retention rate of fiber materials is 100-1000%. Agricultural fiber materials should have good water retention capacity. After the agricultural fiber materials fully absorb water and are weighed, the soil is dried in an oven at 105±2℃. The weight change before and after drying is measured. The reduced mass is the water retention amount, which can be used as an indicator of soil water retention.

[0046] In addition, the thermal conductivity of the fiber material is 0.03-0.06 W / mK (average 25°C), and the specific surface area is 400-700 m 2 / kg; therefore, the agricultural fiber material provided by the present application has good thermal insulation properties, keeps the root system warm, is beneficial for plants to absorb trace elements, and promotes the growth of the root system; and has a large contact area, high solubility, and a high content of elements that can be absorbed by plants.

[0047] The heavy metal index in the fiber is not higher than the national standard (GB5085.3-2007 Hazardous Waste Identification Standard Leaching Toxicity Identification).

[0048] In order to further understand the present invention, the agricultural fiber material containing strontium and zinc elements and the preparation method thereof provided by the present invention are described in detail below in conjunction with the embodiments. The protection scope of the present invention is not limited by the following embodiments.

[0049] Example 1

[0050] The required raw materials of calcium stone powder, silica powder, magnesia: potassium carbonate, industrial alumina, zinc carbonate and strontium oxide are uniformly mixed in a mass ratio of (26.5):(64.2):(4.5):(1.1):(0.7):(1.4):(1.4), continuously melted in the range of 1700-1850°C, spun into fibers at a fiber forming temperature of 1570-1600°C and a spinning speed of 170m / s, and finally heat treated to obtain agricultural fiber materials.

[0051] The agricultural fiber obtained in this embodiment has SiO2: 65.12wt%; MgO: 4.21wt%; CaO: 26.32wt%; Al2O3: 0.625wt%; K2O: 0.98wt%, SrO: 0.86wt%, ZnO: 1.03wt%, O / Si mol: 2.58, (SrO+ZnO): 1.89%, and a bulk density of 96kg / cm 3 The average fiber diameter is 3.6μm, the fiber with a diameter of 1-2μm accounts for 16wt%, the fiber with a diameter of 2-3μm accounts for 65wt%, the fiber with a diameter of 3-4μm accounts for 16wt%, the fiber with a diameter of 4-5μm accounts for 3wt%, the average thermal conductivity at 25℃ is 0.036W / mk, the water retention rate is 560%, the porosity is 72%, and the cadmium, mercury, arsenic, lead, and chromium are not exceeded; the contents of effective strontium, effective zinc, effective silicon, effective calcium, effective magnesium, and effective potassium are 0.9mg / kg, 3.2mg / kg, 296mg / kg, 50mg / kg, 22mg / kg, and 32mg / kg respectively; the fiber specific surface area is 550m 2 / kg.

[0052] Example 2

[0053] The required raw materials of calcium stone powder, silica powder, magnesia, potassium carbonate, industrial alumina, zinc carbonate and strontium oxide are uniformly mixed in a mass ratio of (26.8):(64.2):(5.1):(1.0):(0.5):(1.3):(1.1), continuously melted in the range of 1700-1850°C, spun into fibers at a fiber forming temperature of 1570-1600°C and a spinning speed of 170m / s, and finally heat treated to obtain agricultural fiber materials.

[0054] The agricultural fiber obtained in this embodiment has SiO2: 65.06wt%; MgO: 4.91wt%; CaO: 26.02wt%; Al2O3: 0.475wt%; K2O: 0.8wt%, SrO: 0.86wt%, ZnO: 0.9wt%, O / Si mol: 2.58, (SrO+ZnO): 1.76%, and a bulk density of 96kg / cm 3The average fiber diameter is 4.1μm, the fiber with a diameter of 1-2μm accounts for 15wt%, the fiber with a diameter of 2-3μm accounts for 64wt%, the fiber with a diameter of 3-4μm accounts for 17wt%, the fiber with a diameter of 4-5μm accounts for 4wt%, the average thermal conductivity at 25℃ is 0.036W / mk, the water retention rate is 420%, the porosity is 69%, and the cadmium, mercury, arsenic, lead and chromium are not exceeded; the contents of effective strontium, effective zinc, effective silicon, effective calcium, effective magnesium and effective potassium are 0.8mg / kg, 2.0mg / kg, 290mg / kg, 44mg / kg, 36mg / kg and 28mg / kg respectively; the fiber specific surface area is 522m 2 / kg.

[0055] Comparative Example 1 (SrO+ZnO) is not within the range

[0056] The required raw materials of calcium stone powder, silica powder, magnesia, potassium carbonate, industrial alumina, zinc carbonate and strontium oxide are uniformly mixed in a mass ratio of (27.1):(63.1):(4.1):(1.0):(0.4):(2.2):(2.1), continuously melted in the range of 1500-1650°C, spun into fibers at a fiber forming temperature of 1410-1480°C and a spinning speed of 170m / s, and finally heat treated to obtain agricultural fiber materials.

[0057] The agricultural fiber obtained in this embodiment has SiO2: 64.92wt%; MgO: 4.21wt%; CaO: 26.32wt%; Al2O3: 0.325wt%; K2O: 0.62wt%, SrO: 1.73%wt%, ZnO: 1.80wt%, O / Si mol: 2.59, (SrO+ZnO): 3.53%, and a bulk density of 96kg / cm 3 The average fiber diameter is 3.3μm, the fiber with a diameter of 1-2μm accounts for 22wt%, the fiber with a diameter of 2-3μm accounts for 65wt%, the fiber with a diameter of 3-4μm accounts for 12wt%, the fiber with a diameter of 4-5μm accounts for 1wt%, the average thermal conductivity at 25℃ is 0.033W / mk, the water retention rate is 650%, the porosity is 75%, and the cadmium, mercury, arsenic, lead, etc. do not exceed the standard; the contents of effective strontium, effective zinc, effective potassium, effective silicon, effective calcium, and effective magnesium are 0.5mg / kg, 0.9mg / kg, 10mg / kg, 212mg / kg, 10mg / kg, and 32mg / kg respectively; the fiber specific surface area is 510m 2 / kg.

[0058] Comparative Example 2 SrO: 0wt%

[0059] The required raw materials of calcium stone powder, silica powder, magnesia, potassium carbonate, industrial alumina, zinc carbonate and strontium oxide are uniformly mixed in a mass ratio of (26.5):(65.2):(5.0):(1.1):(0.5):(1.7):(0), continuously melted in the range of 1700-1850°C, spun into fibers at a fiber forming temperature of 1570-1600°C and a spinning speed of 170m / s, and finally heat treated to obtain agricultural fiber materials.

[0060] The agricultural fiber obtained in this embodiment has SiO2: 65.06wt%; MgO: 4.91wt%; CaO: 26.02wt%; Al2O3: 0.475wt%; K2O: 0.8wt%, SrO: 0wt%, ZnO: 0.9wt%, O / Si mol: 2.58, (SrO+ZnO): 0.9%, and a bulk density of 96kg / cm 3 The average fiber diameter is 4.9μm, the fiber with a diameter of 1-2μm accounts for 10wt%, the fiber with a diameter of 2-3μm accounts for 60wt%, the fiber with a diameter of 3-4μm accounts for 25wt%, the fiber with a diameter of 4-5μm accounts for 5wt%, the average thermal conductivity at 25℃ is 0.037W / mk, the water absorption rate is 360%, the porosity is 65%, and the cadmium, mercury, arsenic, lead and chromium are not exceeded; the contents of effective strontium, effective zinc, effective potassium, effective silicon, effective calcium and effective magnesium are 0mg / kg, 0.5mg / kg, 8mg / kg, 256mg / kg, 20mg / kg and 12mg / kg respectively; the fiber specific surface area is 415m 2 / kg.

[0061] Comparative Example 3 ZnO: 0%

[0062] The required raw materials of calcium stone powder, silica powder, magnesia, potassium carbonate, industrial alumina, zinc carbonate and strontium oxide are uniformly mixed in a mass ratio of (26.5):(65.2):(5):(1.3):(0.5):(0):(1.5), continuously melted in the range of 1700-1850°C, spun into fibers at a fiber forming temperature of 1570-1600°C and a spinning speed of 170 m / s, and finally heat treated to obtain agricultural fiber materials.

[0063] The agricultural fiber obtained in this embodiment has SiO2: 65.06wt%; MgO: 4.91wt%; CaO: 26.02wt%; Al2O3: 0.475wt%; K2O: 0.8wt%, SrO: 1.0wt%, ZnO: 0wt%, O / Si mol: 2.58, (SrO+ZnO): 1.0%, and a bulk density of 96kg / cm 3The average fiber diameter is 4.9μm, the fiber with a diameter of 1-2μm accounts for 10wt%, the fiber with a diameter of 2-3μm accounts for 60wt%, the fiber with a diameter of 3-4μm accounts for 25wt%, the fiber with a diameter of 4-5μm accounts for 5wt%, the average thermal conductivity at 25℃ is 0.037W / mk, the water retention rate is 360%, the porosity is 65%, and the cadmium, mercury, arsenic, lead and chromium are not exceeded; the contents of effective strontium, effective zinc, effective potassium, effective silicon, effective calcium and effective magnesium are 0.4mg / kg, 0mg / kg, 18mg / kg; 260mg / kg; 20mg / kg, 12mg / kg respectively; the fiber specific surface area is 405m 2 / kg.

[0064] Comparative Example 4O / Simol

[0065] The required raw materials of calcium stone powder, silica powder, magnesia, potassium carbonate, industrial alumina, zinc carbonate and strontium carbonate are uniformly mixed in a mass ratio of (29.4):(58.3):(5.1):(2.1):(1.1):(2.1):(1.9), continuously melted in the range of 1700-1850°C, spun into fibers at a fiber forming temperature of 1570-1600°C and a spinning speed of 170 m / s, and finally heat treated to obtain agricultural fiber materials.

[0066] The agricultural fiber obtained in this embodiment has SiO2: 58.2wt%; MgO: 5.28wt%; CaO: 29.7wt%; Al2O3: 1.2wt%; Fe2O3: 0.88wt%, SrO: 1.2wt%, ZnO: 1.2wt%, K2O: 0.94, O / Si mol: 2.85, (SrO+ZnO): 2.4%, and a bulk density of 64kg / cm 3 The average fiber diameter is 1.9μm, the fiber with a diameter of 1-2μm accounts for 33wt%, the fiber with a diameter of 2-3μm accounts for 64wt%, the fiber with a diameter of 3-4μm accounts for 3wt%, the fiber with a diameter of 4-5μm accounts for 0wt%, the average thermal conductivity at 25℃ is 0.030W / mk, the pH value is 7.04, the water retention rate is 560%, the porosity is 60%, and the cadmium, mercury, arsenic, lead, and chromium do not exceed the standard; the contents of effective strontium, effective zinc, effective potassium, effective silicon, effective calcium, and effective magnesium are 0.4mg / kg, 0.5mg / kg, 13mg / kg, 40mg / kg, 20mg / kg, and 9mg / kg respectively, and the fiber specific surface area is 595m 2 / kg.

[0067] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0068] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An agricultural fiber material containing strontium and zinc elements, comprising: The molar ratio of O / Si in the agricultural fiber material is (1.8-2.8):1; The total amount of the SrO and the ZnO is 0.6 to 3.5 wt %.

2. The agricultural fiber material according to claim 1, characterized in that: The content of SrO is 0.6-1.5wt%, the content of ZnO is 0.03-2wt%, the total amount of SrO and ZnO is 0.7-3.0wt%, the molar ratio of O / Si in the agricultural fiber material is (1.9-2.6):1, the content of SiO2 is 58-72wt%, the content of MgO is 0.8-6wt%, the content of CaO is 22-29wt%, and the content of K2O is 0.7-2wt%.

3. The agricultural fiber material according to claim 1, characterized in that: The average diameter of the agricultural fiber material is 3.0-4.2 μm, fibers with a diameter of 1-2 μm account for 15-20 wt%, fibers with a diameter of 2-3 μm account for 50-75 wt%, fibers with a diameter of 3-4 μm account for 15-25 wt%, and fibers with a diameter of 4-5 μm account for 0-5 wt%.

4. The agricultural fiber material according to claim 1, characterized in that: The bulk density of the agricultural fiber material is 48 to 160 kg / m 3 .

5. The agricultural fiber material according to claim 1, characterized in that: The porosity of the agricultural fiber material is 50-90%.

6. The agricultural fiber material according to claim 1, characterized in that: The water retention rate of the agricultural fiber material is 100-1000%, and the thermal conductivity is 0.03-0.06 W / mK.

7. The method for preparing the agricultural fiber material according to any one of claims 1 to 6, comprising the following steps: A silicon-containing raw material, a magnesium-containing raw material, a calcium-containing raw material, an aluminum-containing raw material, a potassium-containing raw material, a strontium-containing raw material and a zinc-containing raw material are mixed according to a proportion, and melted to obtain a melt; The melt is fiberized and then heat treated to obtain agricultural fiber material.

8. The preparation method according to claim 7, characterized in that: The melting temperature is 1400-2200° C., the fiber-forming method is spinning, the fiber-forming temperature is 1500-1600° C., and the spinning line speed is 150-200 m / s.

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