Seedling culture soil conditioner and preparation method thereof

Abstract

The invention relates to the technical field of soil improvement, and particularly discloses a seedling culture soil conditioner and a preparation method thereof. The seedling raising soil conditioner provided by the invention is prepared from modified licorice root powder, trehalose and calcined alkali-treated corncobs, the modified licorice powder is prepared by treating licorice residues with choline chloride and urea and then carrying out steam explosion; the calcined alkali-treated corncobs are obtained by calcining corncobs after alkali treatment. By reasonably designing the components of the seedling-raising soil conditioner, the physical properties of the soil can be obviously improved, and the water-retaining property and porosity of the soil are obviously improved by doping the prepared seedling-raising soil conditioner into the soil, so that the growth of seedlings is promoted.

Description

Technical Field

[0001] This invention relates to the field of soil improvement technology, and in particular to a seedling soil conditioner and its preparation method. Background Technology

[0002] Soil, as the core carrier of agricultural production and an important component of the ecosystem, directly determines crop growth and ecological stability through its structure and water retention capacity. Currently, most existing soils face prominent problems of low water retention and small porosity, especially in arid and semi-arid regions, facility agriculture planting areas, and long-term continuous cropping plots, where this problem is even more severe. Insufficient soil porosity leads to poor aeration and hindered root extension, affecting crop absorption of nutrients and oxygen. Low water retention allows water to seep out or evaporate quickly, exacerbating drought stress, causing water and fertilizer loss, reducing resource utilization efficiency, ultimately leading to decreased crop yield and quality, and even triggering a chain reaction of ecological problems such as soil compaction and degradation, thus hindering sustainable agricultural development.

[0003] To address the aforementioned soil problems, various soil improvement methods have emerged in existing technologies, such as applying organic fertilizers, returning straw to the field, and adding inert substrates like perlite or vermiculite. However, these methods have significant drawbacks: organic fertilizers have long improvement cycles and slow effects, requiring large-scale application to achieve noticeable results, increasing labor and transportation costs; improperly handled straw return can easily trigger pests and diseases, and the decomposition process can compete with crops for nutrients; while substrates like perlite and vermiculite can temporarily increase soil porosity, their water retention is poor, and their limited resources and high costs make large-scale application difficult. Furthermore, while some chemical soil conditioners are fast-acting, they can disrupt the balance of soil microbial communities, causing secondary pollution, which does not meet the needs of green agriculture. Therefore, developing a seedling soil conditioner that is highly efficient in water retention, loosens the soil, is low-cost, environmentally friendly, and widely applicable, to address the current technical pain points of low soil water retention and small porosity, has become a crucial issue urgently needing breakthroughs in the field of agricultural technology. Summary of the Invention

[0004] In view of this, the present invention provides a seedling soil conditioner and its preparation method. By optimizing the specific components of the seedling soil conditioner, the present invention solves the technical problems of low soil water retention and small porosity in existing soils, significantly improves the physical properties of the soil, and promotes seedling growth.

[0005] To achieve the above-mentioned objectives, the present invention adopts the following technical solution: This invention provides a seedling soil conditioner, comprising modified licorice powder, trehalose, and corn cob treated with calcined caustic soda; The modified licorice powder is obtained by steam explosion of licorice residue after treatment with choline chloride and urea. The calcined alkali-treated corn cob is obtained by calcining corn cob after alkali treatment.

[0006] Compared with existing technologies, the seedling soil conditioner provided by this invention first uses choline chloride and urea to treat licorice residue, which destroys the lignocellulose in the licorice residue and increases hydrophilic groups. Its loose and porous structure can improve the water retention of the soil. The licorice residue treated with choline chloride and urea is then subjected to steam explosion treatment, which can further expand the internal pores, balance the water retention and porosity of the soil, and improve the physical properties of the soil.

[0007] Alkali can etch the lignocellulose in corn cobs, creating a large number of porous structures. At the same time, alkali can also convert some of the cellulose in corn cobs into hydrophilic groups such as hydroxyl or carboxyl groups, providing a basis for water adsorption. Subsequent calcination treatment can fix the porous structure and enhance the rigidity of the skeleton, preventing the porous structure from collapsing. Calcined alkali-treated corn cobs obtained after calcination can significantly improve the physical properties of soil, increase soil water retention and porosity.

[0008] During their research, the inventors discovered that adding trehalose to corn cob treatment with modified licorice powder and calcined caustic soda further improved the soil amendment's effectiveness and improved soil aggregate structure. The three components synergistically resolved the contradiction between water retention and aeration inherent in a single component, significantly enhancing soil water retention stability and porosity, comprehensively optimizing soil physical properties, and thus promoting seedling growth.

[0009] Preferably, the seedling soil conditioner comprises the following components in the indicated mass percentages: 15%~30% modified licorice powder, 5%~15% trehalose, and 55%~75% calcined caustic soda-treated corn cob.

[0010] Preferably, the preparation method of the modified licorice powder includes the following steps: S1. Choline chloride and urea are melt-mixed to obtain a choline chloride-urea mixed solvent; S2. Add the licorice residue to the choline chloride-urea mixed solvent, keep it at 50~60℃, and separate the solid and liquid to obtain the first-processed licorice residue. S3. The licorice residue from the first treatment is subjected to steam explosion at 0.25~0.35MPa to obtain the modified licorice powder.

[0011] The modified licorice powder preparation method provided by the present invention has mild process conditions, simple steps, is easy to industrialize, and has controllable cost. The modified licorice powder obtained can significantly improve the water retention and porosity of soil.

[0012] It should be further noted that in S1, the specific operation of melting and mixing is no longer limited, and can be carried out in accordance with the conventional technical means mastered by those skilled in the art.

[0013] Preferably, in S1, the molar ratio of choline chloride to urea is 1:(1.8~2.2).

[0014] Preferably, in S2, the particle size of the licorice residue is 0.355~0.365mm.

[0015] It should be further noted that in S2, the licorice residue also needs to be pretreated by placing it in a blower dryer to dry it until its weight remains constant.

[0016] Preferably, in S2, the mass-to-volume ratio of the licorice residue and the choline chloride-urea mixed solvent is 1 g: (8~12) mL.

[0017] Preferably, in S2, the heat preservation time is 10~14h.

[0018] It should be further noted that in S2, the heat preservation process requires stirring, and the stirring rate can be 200~300 r / min.

[0019] It should be further noted that in S2, the licorice residue from the first treatment needs to be washed and dried before the steam explosion.

[0020] Preferably, in S3, the steam explosion time is 8-12 minutes.

[0021] For example, in S3, after the steam explosion, the exploded material needs to be washed with water, and then the washed solid components are dried.

[0022] Preferably, the method for preparing corn cobs treated with calcined caustic soda includes the following steps: Step 1: Soak the corn cobs in an alkaline solution, separate the solid and liquid, and obtain the first-processed corn cobs; Step 2: Heat the corn cob that has been treated once to 350~450℃ and calcine it to obtain the corn cob treated with calcined caustic soda.

[0023] The method for preparing corn cob treated with calcined caustic soda provided by this invention is simple, convenient, requires no complex equipment, and is easy to achieve industrial mass production. The alkali solution, as a modifier, is not only inexpensive but also effectively breaks down the dense structure of the corn cob. Furthermore, calcination at a specific temperature can solidify its porous framework while retaining hydrophilic groups. Through this process, the performance of the corn cob can be significantly improved.

[0024] Preferably, in step 1, the corn cob has a fineness of 20-60 mesh.

[0025] Preferably, in step 1, the alkaline solution includes a sodium hydroxide solution.

[0026] Preferably, in step 1, the ratio of corn cob to alkaline solution is 1g:(8~12)mL, and the mass concentration of alkaline solution is 5%~8%.

[0027] Preferably, in step 1, the soaking time is 2 to 4 hours.

[0028] For example, in step 1, after the solid-liquid separation, the filtered product needs to be washed with water until the washing liquid is neutral, and then dried to obtain a processed corn cob.

[0029] Preferably, in step 2, a programmed temperature rise method is used, with the temperature increased to 350-450°C at a rate of 5-8°C / min.

[0030] Preferably, in step 2, the calcination time is 2-3 hours.

[0031] This invention provides a method for preparing the above-mentioned seedling soil conditioner, comprising the following steps: The modified licorice powder, trehalose, and calcined caustic soda-treated corn cobs are mixed evenly to obtain a seedling soil conditioner. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0033] The corn cobs and licorice residue used in the embodiments and comparative examples of this invention can be any commercially available raw materials, and there are no special requirements. Unless otherwise specified, the raw materials and reagents used in this invention are all conventional commercially available products; unless otherwise specified, the methods used in this invention are all conventional methods in the field.

[0034] This invention provides a seedling soil conditioner, comprising modified licorice powder, trehalose, and corn cob treated with calcined caustic soda; The modified licorice powder is obtained by steam explosion of licorice residue after treatment with choline chloride and urea. The calcined alkali-treated corn cob is obtained by calcining corn cob after alkali treatment.

[0035] In some embodiments, the seedling soil conditioner comprises the following components by weight percentage: 15%~30% modified licorice powder, 5%~15% trehalose, and 55%~75% calcined caustic soda-treated corn cob.

[0036] In some embodiments, the preparation method of the modified licorice powder includes the following steps: S1. Choline chloride and urea are melt-mixed to obtain a choline chloride-urea mixed solvent; S2. Add the licorice residue to the choline chloride-urea mixed solvent, keep it at 50~60℃, and separate the solid and liquid to obtain the first-processed licorice residue. S3. The licorice residue from the first treatment is subjected to steam explosion at 0.25~0.35MPa to obtain the modified licorice powder.

[0037] In some embodiments, in S1, the molar ratio of choline chloride to urea is 1:(1.8~2.2).

[0038] In some embodiments, in S2, the particle size of the licorice residue is 0.355~0.365mm.

[0039] In some embodiments, in S2, the mass-to-volume ratio of the licorice residue and the choline chloride-urea mixed solvent is 1 g: (8~12) mL.

[0040] In some embodiments, the heat preservation time in S2 is 10~14h.

[0041] In some embodiments, the steam explosion time in S3 is 8-12 minutes.

[0042] In some embodiments, the method for preparing corn cobs treated with calcined caustic soda includes the following steps: Step 1: Soak the corn cobs in an alkaline solution, separate the solid and liquid, and obtain the first-processed corn cobs; Step 2: Heat the corn cob that has been treated once to 350~450℃ and calcine it to obtain the corn cob treated with calcined caustic soda.

[0043] In some embodiments, in step 1, the corn cob has a fineness of 20-60 mesh.

[0044] In some embodiments, in step 1, the alkaline solution includes a sodium hydroxide solution.

[0045] In some embodiments, in step 1, the ratio of corn cob to alkaline solution is 1g:(8~12)mL, and the mass concentration of alkaline solution is 5%~8%.

[0046] In some embodiments, the soaking time in step 1 is 2 to 4 hours.

[0047] In some embodiments, in step 2, a programmed temperature rise method is used to raise the temperature to 350-450°C at a rate of 5-8°C / min.

[0048] In some embodiments, the calcination time in step 2 is 2-3 hours.

[0049] This invention also provides a method for preparing a seedling soil conditioner, comprising the following steps: The modified licorice powder, trehalose, and calcined caustic soda-treated corn cobs are mixed evenly to obtain a seedling soil conditioner.

[0050] Example 1 This embodiment provides a seedling soil conditioner, comprising the following components by weight percentage: 15% modified licorice powder, 10% trehalose, and 75% calcined caustic soda-treated corn cob; The preparation method of modified licorice powder includes the following steps: S1. Mix choline chloride and urea in a molar ratio of 1:2 and melt them together at 70°C to obtain a choline chloride-urea mixed solvent. S2. Licorice residue with a particle size of 0.355~0.365mm is added to a choline chloride-urea mixed solvent at a ratio of 1g:10mL and kept at 50℃ for 10h. During the heat preservation, the mixture needs to be stirred at a rate of 300r / min. Solid-liquid separation, washing, and drying are performed to obtain licorice residue that has been treated once. S3. The licorice residue from the first treatment was steam-exploded at 0.3 MPa for 10 minutes. After the steam explosion, the exploded product was washed with water and the washed solid components were dried to obtain the modified licorice powder. The preparation method of corn cob treatment with calcined caustic soda includes the following steps: Step 1: Soak corn cobs with a fineness of 20-40 mesh in a 5wt% sodium hydroxide solution for 3 hours at a ratio of 1g:10mL. After solid-liquid separation, the filtered product needs to be washed with water until the washing liquid is neutral. Then dry to obtain the first-processed corn cobs. Step 2: Heat the corn cob that has been treated once to 400℃ at a rate of 5℃ / min and calcine for 2 hours to obtain the calcined caustic soda treated corn cob.

[0051] This embodiment provides a method for preparing the above-mentioned seedling soil conditioner, which includes mixing the above-mentioned components.

[0052] Example 2 This embodiment provides a seedling soil conditioner, comprising the following components by weight percentage: 30% modified licorice powder, 5% trehalose, and 65% calcined caustic soda-treated corn cob; The preparation method of modified licorice powder includes the following steps: S1. Mix choline chloride and urea in a molar ratio of 1:2 and melt them together at 70°C to obtain a choline chloride-urea mixed solvent. S2. Licorice residue with a particle size of 0.355~0.365mm is added to a choline chloride-urea mixed solvent at a ratio of 1g:8mL and kept at 60℃ for 14h. During the heat preservation, the mixture needs to be stirred at a rate of 200r / min. After solid-liquid separation, washing, and drying, licorice residue with one-time treatment is obtained. S3. The licorice residue from the first treatment was steam-exploded at 0.25 MPa for 8 minutes. After the steam explosion, the exploded product was washed with water and the washed solid components were dried to obtain the modified licorice powder. The preparation method of corn cob treatment with calcined caustic soda includes the following steps: Step 1: Add corn cobs with a fineness of 40-60 mesh to an 8wt% sodium hydroxide solution and soak for 2 hours according to a ratio of 1g:8mL. After solid-liquid separation, the filtered product needs to be washed with water until the washing liquid is neutral. Then dry to obtain the first-processed corn cobs. Step 2: The corn cob that has been treated once is heated to 350°C at a rate of 8°C / min and calcined for 3 hours to obtain the calcined caustic soda treated corn cob.

[0053] This embodiment provides a method for preparing the above-mentioned seedling soil conditioner, which includes mixing the above-mentioned components.

[0054] Example 3 This embodiment provides a seedling soil conditioner, comprising the following components by weight percentage: 20% modified licorice powder, 10% trehalose, and 70% calcined caustic soda-treated corn cob; The preparation method of modified licorice powder includes the following steps: S1. Mix choline chloride and urea in a molar ratio of 1:2 and melt them together at 70°C to obtain a choline chloride-urea mixed solvent. S2. Licorice residue with a particle size of 0.355~0.365mm is added to a choline chloride-urea mixed solvent at a ratio of 1g:12mL and kept at 55℃ for 12h. During the heat preservation, the mixture needs to be stirred at a rate of 250r / min. After solid-liquid separation, washing, and drying, licorice residue with one-time treatment is obtained. S3. The licorice residue from the first treatment was steam-exploded at 0.35 MPa for 12 minutes. After the steam explosion, the exploded product was washed with water and the washed solid components were dried to obtain the modified licorice powder. The preparation method of corn cob treatment with calcined caustic soda includes the following steps: Step 1: Soak corn cobs with a fineness of 40-60 mesh in a 6wt% sodium hydroxide solution for 4 hours at a ratio of 1g:12mL. After solid-liquid separation, the filtered product needs to be washed with water until the washing liquid is neutral. Then dry to obtain the first-processed corn cobs. Step 2: The corn cob that has been treated once is heated to 450°C at a rate of 6°C / min and calcined for 3 hours to obtain the calcined caustic soda treated corn cob.

[0055] This embodiment provides a method for preparing the above-mentioned seedling soil conditioner, which includes mixing the above-mentioned components.

[0056] Comparative Example 1 This comparative example provides a seedling soil conditioner, which, compared with Example 1, replaces choline chloride with an equal amount of tetramethylammonium chloride; Specifically, it includes the following components by weight percentage: 15% modified licorice powder, 10% trehalose, and 75% calcined caustic soda-treated corn cob; The preparation method of modified licorice powder includes the following steps: S1. Mix tetramethylammonium chloride and urea in a molar ratio of 1:2 and melt them together at 120°C to obtain a tetramethylammonium chloride-urea mixed solvent. S2. Licorice residue with a particle size of 0.355~0.365mm is added to a tetramethylammonium chloride-urea mixed solvent at a ratio of 1g:10mL and kept at 50℃ for 10h. During the heat preservation, the mixture needs to be stirred at a rate of 300r / min. After solid-liquid separation, washing, and drying, licorice residue with one-time treatment is obtained. S3. The licorice residue from the first treatment was steam-exploded at 0.3 MPa for 10 minutes. After the steam explosion, the exploded product was washed with water and the washed solid components were dried to obtain the modified licorice powder. The preparation method of corn cob treatment with calcined caustic soda includes the following steps: Step 1: Soak corn cobs with a fineness of 20-40 mesh in a 5wt% sodium hydroxide solution for 3 hours at a ratio of 1g:10mL. After solid-liquid separation, the filtered product needs to be washed with water until the washing liquid is neutral. Then dry to obtain the first-processed corn cobs. Step 2: Heat the corn cob that has been treated once to 400℃ at a rate of 5℃ / min and calcine for 2 hours to obtain the calcined caustic soda treated corn cob.

[0057] This comparative example provides a method for preparing the above-mentioned seedling soil conditioner, which includes mixing the above-mentioned components.

[0058] Comparative Example 2 This comparative example provides a seedling soil conditioner, which differs from Example 1 in that it eliminates the steam explosion step. Specifically, it includes the following components by weight percentage: 15% modified licorice powder, 10% trehalose, and 75% calcined caustic soda-treated corn cob; The preparation method of modified licorice powder includes the following steps: S1. Mix choline chloride and urea in a molar ratio of 1:2 and melt them together at 70°C to obtain a choline chloride-urea mixed solvent. S2. Licorice residue with a particle size of 0.355~0.365mm is added to a choline chloride-urea mixed solvent at a ratio of 1g:10mL and kept at 50℃ for 10h. During the heat preservation, the mixture needs to be stirred at a rate of 300r / min. After solid-liquid separation, washing, and drying, the modified licorice powder is obtained. The preparation method of corn cob treatment with calcined caustic soda includes the following steps: Step 1: Soak corn cobs with a fineness of 20-40 mesh in a 5wt% sodium hydroxide solution for 3 hours at a ratio of 1g:10mL. After solid-liquid separation, the filtered product needs to be washed with water until the washing liquid is neutral. Then dry to obtain the first-processed corn cobs. Step 2: Heat the corn cob that has been treated once to 400℃ at a rate of 5℃ / min and calcine for 2 hours to obtain the calcined caustic soda treated corn cob.

[0059] This comparative example provides a method for preparing the above-mentioned seedling soil conditioner, which includes mixing the above-mentioned components.

[0060] Comparative Example 3 This comparative example provides a seedling soil conditioner that replaces licorice residue with an equal amount of sugarcane residue. Specifically, the components include the following percentages by weight: 15% modified sugarcane flour, 10% trehalose, and 75% calcined caustic soda-treated corn cob; The preparation method of modified sugarcane bagasse includes the following steps: S1. Mix choline chloride and urea in a molar ratio of 1:2 and melt them together at 70°C to obtain a choline chloride-urea mixed solvent. S2. Sugarcane bagasse with a particle size of 0.355~0.365mm is added to a choline chloride-urea mixed solvent at a ratio of 1g:10mL and kept at 50℃ for 10h. During the heat preservation, the mixture needs to be stirred at a rate of 300r / min. Solid-liquid separation, washing, and drying are performed to obtain the first-processed sugarcane bagasse. S3. The sugarcane bagasse was steam-exploded at 0.3 MPa for 10 minutes. After the steam explosion, the exploded material was washed with water and the washed solid components were dried to obtain the modified sugarcane powder. The preparation method of corn cob treatment with calcined caustic soda includes the following steps: Step 1: Soak corn cobs with a fineness of 20-40 mesh in a 5wt% sodium hydroxide solution for 3 hours at a ratio of 1g:10mL. After solid-liquid separation, the filtered product needs to be washed with water until the washing liquid is neutral. Then dry to obtain the first-processed corn cobs. Step 2: Heat the corn cob that has been treated once to 400℃ at a rate of 5℃ / min and calcine for 2 hours to obtain the calcined caustic soda treated corn cob.

[0061] This comparative example provides a method for preparing the above-mentioned seedling soil conditioner, which includes mixing the above-mentioned components.

[0062] Example of effect The seedling soil conditioner provided in Examples 1-3 and Comparative Examples 1-3 was applied at a rate of 1500 kg / hm². 2 The amount of product added to the soil was determined, and the soil porosity was tested according to the testing methods in "Soil Agricultural Chemical Analysis Methods 22.4 1999". The field water capacity of the soil was determined according to the testing method in NY / T 1121.22-2010 "Soil Testing Part 22: Determination of Soil Field Water Holding Capacity by Ring Method". Grape rootstock 5BB branches with a diameter of 1.2 cm and a length of 20 cm were planted on the soil improved in Examples 1-3 and Examples 1-3. During the rooting and callus induction stage, the temperature was controlled at 28-30℃ and the humidity was above 90%. During the budding and seedling growth stage, the daytime temperature was 25-28℃ and the nighttime temperature was 13-15℃, and the humidity was 60-90%. Before planting, the daytime temperature was 25-30℃ and the nighttime temperature was 15-20℃, and the humidity was 50%-70%. The change in the diameter of the seedlings was detected one year later. Where the thickness change rate = (thickness after planting - thickness before planting) / thickness before planting * 100%; The roughness refers to the diameter of the middle part of the rootstock as measured with vernier calipers. The specific test results are shown in Table 1: Table 1

[0063] As shown in Table 1, the seedling soil conditioner prepared in the embodiments of the present invention can significantly improve soil water retention stability and porosity, comprehensively optimize soil physical properties, and promote seedling growth; its field water holding capacity can reach 293.5 g / kg, and its porosity is as high as 0.91.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A seedling soil conditioner, characterized in that, This includes treatment of corn cobs with modified licorice powder, trehalose, and calcined caustic soda; The modified licorice powder is obtained by steam explosion of licorice residue after treatment with choline chloride and urea. The calcined alkali-treated corn cob is obtained by calcining corn cob after alkali treatment.

2. The seedling soil conditioner as described in claim 1, characterized in that, The seedling soil conditioner comprises the following components by weight percentage: 15%~30% modified licorice powder, 5%~15% trehalose, and 55%~75% calcined caustic soda-treated corn cobs.

3. The seedling soil conditioner as described in claim 1 or 2, characterized in that, The preparation method of the modified licorice powder includes the following steps: S1. Choline chloride and urea are melt-mixed to obtain a choline chloride-urea mixed solvent; S2. Add the licorice residue to the choline chloride-urea mixed solvent, keep it at 50~60℃, and separate the solid and liquid to obtain the first-processed licorice residue. S3. The licorice residue from the first treatment is subjected to steam explosion at 0.25~0.35MPa to obtain the modified licorice powder.

4. The seedling soil conditioner as described in claim 3, characterized in that, In S1, the molar ratio of choline chloride to urea is 1:(1.8~2.2). In S2, the particle size of the licorice residue is 0.355~0.365mm; In S2, the mass-volume ratio of the licorice residue and the choline chloride-urea mixed solvent is 1g:(8~12)mL.

5. The seedling soil conditioner as described in claim 3, characterized in that, In S2, the heat preservation time is 10~14h; In S3, the steam explosion time is 8~12 minutes.

6. The seedling soil conditioner as described in claim 1 or 2, characterized in that, The method for preparing corn cobs treated with calcined caustic soda includes the following steps: Step 1: Soak the corn cobs in an alkaline solution, separate the solid and liquid, and obtain the first-processed corn cobs; Step 2: Heat the corn cob that has been treated once to 350~450℃ and calcine it to obtain the corn cob treated with calcined caustic soda.

7. The seedling soil conditioner as described in claim 6, characterized in that, In step 1, the corn cob has a fineness of 20-60 mesh; In step 1, the alkaline solution includes a sodium hydroxide solution.

8. The seedling soil conditioner as described in claim 6, characterized in that, In step 1, the ratio of corn cob to alkaline solution is 1g:(8~12)mL, and the mass concentration of alkaline solution is 5%~8%.

9. The seedling soil conditioner as described in claim 6, characterized in that, In step 1, the soaking time is 2-4 hours; In step 2, a programmed temperature rise method is used to raise the temperature to 350-450℃ at a rate of 5-8℃ / min; In step 2, the calcination time is 2-3 hours.

10. A method for preparing the seedling soil conditioner according to any one of claims 1 to 9, characterized in that, Includes the following steps: The modified licorice powder, trehalose, and calcined caustic soda-treated corn cobs are mixed evenly to obtain a seedling soil conditioner.

Images