Plant growth regulator for saline-alkali soil improvement and preparation method thereof
Through the preparation method of the modification regulator, sodium lignin sulfonate and sorgia are used to protect indole acetic acid, which solves the problem of loss of plant growth regulator activity in saline-alkali environment, and achieves sustained release effect and plant growth promotion.
Patent Information
- Application Number
- CN202510402319.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-01
- Publication Date
- 2025-08-15
AI Technical Summary
Existing plant growth regulators are prone to decarboxylation reactions in saline-alkali environments, lose their biological activity, and cannot effectively promote plant growth.
The modification regulator is composed of indole acetic acid, sodium lignin sulfonate and cloves. Controlled release particles are prepared by spray drying and wrapped with cloves to form a stable complex to protect the activity of indole acetic acid in an alkaline environment and achieve sustained release effect.
It improves the efficiency of plant growth regulators, enhances the ability of plants to adapt to the saline-alkali environment, promotes root growth, and reduces the amount of use and environmental impact.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of saline-alkali land improvement, in particular to a plant growth regulator for saline-alkali land improvement and a preparation method thereof. Background Art
[0002] Plant growth regulators are an indispensable and important tool in the development of modern agriculture. They are based on the structure, function and action principle of plant hormones and are produced by chemical synthesis or microbial fermentation. These chemicals can change the content and distribution of endogenous hormones in plants, thereby interfering with the expression of the plant's internal genome and the transport and distribution of expression products, thereby regulating the metabolism and physiological functions of plants. In actual applications, plant growth regulators are specific, that is, they exert their effects by binding to receptors in plant cells and tissues, which is different from the hormone targets of animals, including humans. Secondly, the amount of plant growth regulators used is small, but the effect is significant. At the same time, plant growth regulators are broad-spectrum and are suitable for most crops or plants in the planting industry, such as field crops, vegetables, fruit trees, flowers, etc. In short, plant growth regulators are an indispensable and important tool in the development of modern agriculture.
[0003] Plant growth regulators also play an important role in saline-alkali land improvement. However, existing plant growth regulators that promote cell elongation and root development are prone to decarboxylation reactions in saline-alkali environments, thereby losing their biological activity. In view of this, we propose a plant growth regulator for saline-alkali land improvement and a preparation method thereof. Summary of the Invention
[0004] The object of the present invention is to provide a plant growth regulator for improving saline-alkali land and a preparation method thereof, so as to solve the problems raised in the above background technology.
[0005] To achieve the above object, the present invention provides a plant growth regulator for improving saline-alkali land, comprising the following components: 0.08-0.12 parts by weight of a modified regulator, 0.14-0.18 parts by weight of a sucrose ester, 0.04-0.06 parts by weight of naphthaleneacetic acid, 0.12-0.18 parts by weight of gibberellic acid, 0.03-0.05 parts by weight of 6-benzylaminopurine, 0.8-1 parts by weight of vitamin C, 1-5 parts by weight of mannitol, 1-3 parts by weight of betaine, and the remainder being water; The modified regulator is prepared by surface modification of indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:5-10:1.5-4.5.
[0006] Preferably, the preparation method of the modified regulator is as follows: Sodium ligninsulfonate is weighed and dissolved in distilled water to form a sodium ligninsulfonate aqueous solution, indoleacetic acid is dissolved in ethanol to form an indoleacetic acid solution, and the indoleacetic acid solution is then added dropwise to the sodium ligninsulfonate solution, and the pH of the solution is adjusted during the mixing process. Stirring is continued, the mixed solution is poured into a spray dryer, and the inlet temperature, outlet temperature, feed rate and nozzle diameter are set. The dried particles are collected and stored in a drying oven at 40-50° C. and dried to constant weight to obtain composite particles; Millet colloid is prepared into a millet colloid solution with a concentration of 12-18% w / v, the composite particles are added into a fluidized bed container and fully fluidized, and then the millet colloid solution is loaded into a spray system, the inlet air temperature, outlet air temperature, spray rate, and nozzle inner diameter of the fluidized bed are set, and the spraying is continued while hot air at 40-60°C is introduced for 30-50 minutes. After the spraying is completed, the hot air is continued to be introduced for 10-15 minutes to obtain a modified regulator.
[0007] Indoleacetic acid (IAA) is a plant growth hormone. The indole ring and acetic acid side chain in its chemical structure are the key parts that promote plant growth. The indole ring is an important structural part of the IAA molecule. It binds to receptors in plant cells, thereby activating a series of signal transduction pathways and promoting cell elongation and division. The acetic acid side chain is another key part of the IAA molecule. It can regulate the chemical properties of the IAA molecule, keep it stable in the plant body, and release the active form of IAA when needed. This chemical structure of IAA enables it to play a variety of physiological functions in the plant body, including promoting cell elongation, division and differentiation, and regulating plant growth and development. However, indoleacetic acid has a carboxyl group in its chemical structure. In an alkaline environment, the carboxyl group is prone to decarboxylation. After the decarboxylation reaction occurs, the molecular structure of indoleacetic acid changes, and its original biological activity is lost. Therefore, sodium lignin sulfonate is introduced. Sodium lignin sulfonate is a natural high molecular polymer with a large specific surface area and contains a variety of active groups. It can achieve physical adsorption by forming hydrogen bonds with plant growth regulators and wrap them inside, thereby playing a protective role. At the same time, indoleacetic acid is slowly released as lignin decomposes in nature. Therefore, this fertilizer has good slow-release characteristics, which prolongs the action time of plant growth regulators and improves the efficiency of plant growth regulators.
[0008] Although sodium lignin sulfonate can provide a certain protection to prevent IAA from decarboxylating under alkaline conditions, the soil properties of saline-alkali land are complex, and the distribution of salt and alkaline substances is uneven. Generally, the pH value of light saline-alkali land is 7.1-8.5, the pH value of moderate saline-alkali land is 8.5-9.5, and the pH value of heavy saline-alkali land is above 9.5. Therefore, in a high pH environment, the stability of sodium lignin sulfonate itself will also be affected, thereby affecting the effect of the modified regulator. Millet gum is a protein with good biocompatibility. It can be decomposed as plant nutrients and can also be used to wrap sodium lignin sulfonate and IAA particles, reducing the chance of alkaline substances directly contacting sodium lignin sulfonate, thereby promoting the effect of plant growth regulators.
[0009] Preferably, the mass fraction of the sodium lignin sulfonate aqueous solution is 5-10%.
[0010] Preferably, the mass fraction of the indoleacetic acid solution is 0.1-1%.
[0011] Preferably, the pH of the mixed solution is maintained at 6-7.
[0012] Preferably, the inlet temperature of the spray dryer is 120-140° C., the outlet temperature is 70-80° C., the feed rate is 10-20 mL / min, and the nozzle diameter is 0.5-2 mm.
[0013] Preferably, the concentration of the millet colloid solution is 12-18% w / v.
[0014] Preferably, the fluidized bed has an air inlet temperature of 40-60°C, an air outlet temperature of 30-40°C, a spray rate of 1-5 mL / min, and a nozzle inner diameter of 0.5-1.0 mm.
[0015] In another aspect, the present invention provides a method for preparing a plant growth regulator for improving saline-alkali land, which is used for any of the above-mentioned plant growth regulators for improving saline-alkali land, comprising the following steps: Add water to mannitol and betaine, heat and stir until completely dissolved to obtain a basic solution. After the basic solution is cooled, add a modified regulator, sucrose ester, naphthaleneacetic acid, gibberellic acid, 6-benzylaminopurine, and vitamin C in sequence, stir and mix thoroughly to obtain a plant growth regulator for saline-alkali land improvement.
[0016] Preferably, the heating temperature is 40-60°C.
[0017] Compared with the prior art, the present invention has the following beneficial effects: In the plant growth regulator for improving saline-alkali land and the preparation method thereof, indoleacetic acid and sodium lignin sulfonate are used to prepare controlled-release particles by a spray drying method, and then the particles are coated with millet colloid to obtain a modified regulator. Indoleacetic acid can promote the growth and development of plant roots and enhance the adaptability of plants to saline-alkali environments. Millet colloid and sodium lignin sulfonate are used to overcome the problem that indoleacetic acid is easily decarboxylated in an alkaline environment, resulting in decreased activity. The activity of indoleacetic acid is protected and the controlled-release property is also achieved, which can continuously stimulate the growth of plant roots, thereby improving plant growth efficiency and reducing the amount of plant growth regulator used and the impact on the environment. DETAILED DESCRIPTION
[0018] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.
[0019] The plant growth regulator for improving saline-alkali land of the present invention comprises the following components: 0.08-0.12 parts by weight of a modified regulator, 0.14-0.18 parts by weight of a sucrose ester, 0.04-0.06 parts by weight of naphthaleneacetic acid, 0.12-0.18 parts by weight of gibberellic acid, 0.03-0.05 parts by weight of 6-benzylaminopurine, 0.8-1 parts by weight of vitamin C, 1-5 parts by weight of mannitol, 1-3 parts by weight of betaine, and the remainder being water; The modified regulator is prepared by surface modification of indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:5-10:1.5-4.5.
[0020] Example 1: A plant growth regulator for improving saline-alkali land and a preparation method thereof, comprising the following steps: Prepare the following components: 0.08 parts by weight of a modified regulator, 0.18 parts by weight of a sucrose ester, 0.06 parts by weight of naphthaleneacetic acid, 0.18 parts by weight of gibberellic acid, 0.05 parts by weight of 6-benzylaminopurine, 1 part by weight of vitamin C, 5 parts by weight of mannitol, and 3 parts by weight of betaine, with the remainder being water; The modified regulator is surface-modified by indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:10:4.5; Sodium lignin sulfonate was weighed and dissolved in distilled water to form a 10% by mass sodium lignin sulfonate aqueous solution, indoleacetic acid was dissolved in ethanol to form a 1% by mass indoleacetic acid solution, and the indoleacetic acid solution was then added dropwise to the sodium lignin sulfonate solution, and the pH of the solution was adjusted to maintain at 7 during the mixing process, and stirring was continued. The mixed solution was poured into a spray dryer with an inlet temperature of 130° C., an outlet temperature of 80° C., a feed rate of 10 mL / min, and a nozzle diameter of 1 mm set. The dried particles were collected and stored in a drying oven at 40-50° C. to dry to constant weight to obtain a modified regulator. Add water to mannitol and betaine, heat and stir at 60°C until completely dissolved to obtain a basic solution. After the basic solution is cooled, add a modified regulator, sucrose ester, naphthaleneacetic acid, gibberellic acid, 6-benzylaminopurine, and vitamin C in sequence, stir and mix thoroughly to obtain a plant growth regulator for saline-alkali land improvement.
[0021] Example 2: A plant growth regulator for improving saline-alkali land and a preparation method thereof, comprising the following steps: Prepare the following components: 0.1 parts by weight of a modified regulator, 0.18 parts by weight of a sucrose ester, 0.06 parts by weight of naphthaleneacetic acid, 0.18 parts by weight of gibberellic acid, 0.05 parts by weight of 6-benzylaminopurine, 1 part by weight of vitamin C, 5 parts by weight of mannitol, and 3 parts by weight of betaine, with the remainder being water; The modified regulator is surface-modified by indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:10:4.5; Sodium lignin sulfonate was weighed and dissolved in distilled water to form a 10% by mass sodium lignin sulfonate aqueous solution, indoleacetic acid was dissolved in ethanol to form a 1% by mass indoleacetic acid solution, and the indoleacetic acid solution was then added dropwise to the sodium lignin sulfonate solution, and the pH of the solution was adjusted to maintain at 7 during the mixing process, and stirring was continued. The mixed solution was poured into a spray dryer with an inlet temperature of 130° C., an outlet temperature of 80° C., a feed rate of 10 mL / min, and a nozzle diameter of 1 mm set. The dried particles were collected and stored in a drying oven at 40-50° C. to dry to constant weight to obtain a modified regulator. Add water to mannitol and betaine, heat and stir at 60°C until completely dissolved to obtain a basic solution. After the basic solution is cooled, add a modified regulator, sucrose ester, naphthaleneacetic acid, gibberellic acid, 6-benzylaminopurine, and vitamin C in sequence, stir and mix thoroughly to obtain a plant growth regulator for saline-alkali land improvement.
[0022] Example 3: A plant growth regulator for improving saline-alkali land and a preparation method thereof, comprising the following steps: Prepare the following components: 0.12 parts by weight of a modified regulator, 0.18 parts by weight of a sucrose ester, 0.06 parts by weight of naphthaleneacetic acid, 0.18 parts by weight of gibberellic acid, 0.05 parts by weight of 6-benzylaminopurine, 1 part by weight of vitamin C, 5 parts by weight of mannitol, and 3 parts by weight of betaine, with the remainder being water; The modified regulator is surface-modified by indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:10:4.5; Sodium lignin sulfonate was weighed and dissolved in distilled water to form a 10% by mass sodium lignin sulfonate aqueous solution, indoleacetic acid was dissolved in ethanol to form a 1% by mass indoleacetic acid solution, and the indoleacetic acid solution was then added dropwise to the sodium lignin sulfonate solution, and the pH of the solution was adjusted to maintain at 7 during the mixing process, and stirring was continued. The mixed solution was poured into a spray dryer with an inlet temperature of 130° C., an outlet temperature of 80° C., a feed rate of 10 mL / min, and a nozzle diameter of 1 mm set. The dried particles were collected and stored in a drying oven at 40-50° C. to dry to constant weight to obtain a modified regulator. Add water to mannitol and betaine, heat and stir at 60°C until completely dissolved to obtain a basic solution. After the basic solution is cooled, add a modified regulator, sucrose ester, naphthaleneacetic acid, gibberellic acid, 6-benzylaminopurine, and vitamin C in sequence, stir and mix thoroughly to obtain a plant growth regulator for saline-alkali land improvement.
[0023] Example 4: A plant growth regulator for improving saline-alkali land and a preparation method thereof, comprising the following steps: Prepare the following components: 0.1 part by weight of a modified regulator, 0.14 part by weight of a sucrose ester, 0.04 part by weight of naphthaleneacetic acid, 0.12 part by weight of gibberellic acid, 0.03 part by weight of 6-benzylaminopurine, 0.8 part by weight of vitamin C, 1 part by weight of mannitol, 1 part by weight of betaine, and the remainder being water; The modified regulator is surface-modified by indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:5:4.5; Sodium lignin sulfonate was weighed and dissolved in distilled water to form a 10% by mass sodium lignin sulfonate aqueous solution, indoleacetic acid was dissolved in ethanol to form a 1% by mass indoleacetic acid solution, and the indoleacetic acid solution was then added dropwise to the sodium lignin sulfonate solution, and the pH of the solution was adjusted to maintain at 7 during the mixing process, and stirring was continued. The mixed solution was poured into a spray dryer with an inlet temperature of 130° C., an outlet temperature of 80° C., a feed rate of 10 mL / min, and a nozzle diameter of 1 mm set. The dried particles were collected and stored in a drying oven at 40-50° C. to dry to constant weight to obtain a modified regulator. Add water to mannitol and betaine, heat and stir at 60°C until completely dissolved to obtain a basic solution. After the basic solution is cooled, add a modified regulator, sucrose ester, naphthaleneacetic acid, gibberellic acid, 6-benzylaminopurine, and vitamin C in sequence, stir and mix thoroughly to obtain a plant growth regulator for saline-alkali land improvement.
[0024] Example 5: A plant growth regulator for improving saline-alkali land and a preparation method thereof, comprising the following steps: Prepare the following components: 0.1 part by weight of a modified regulator, 0.14 part by weight of a sucrose ester, 0.04 part by weight of naphthaleneacetic acid, 0.12 part by weight of gibberellic acid, 0.03 part by weight of 6-benzylaminopurine, 0.8 part by weight of vitamin C, 1 part by weight of mannitol, 1 part by weight of betaine, and the remainder being water; The modified regulator is surface-modified by indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:8:2; Sodium lignin sulfonate was weighed and dissolved in distilled water to form a 10% by mass sodium lignin sulfonate aqueous solution, indoleacetic acid was dissolved in ethanol to form a 1% by mass indoleacetic acid solution, and the indoleacetic acid solution was then added dropwise to the sodium lignin sulfonate solution, and the pH of the solution was adjusted to maintain at 7 during the mixing process, and stirring was continued. The mixed solution was poured into a spray dryer with an inlet temperature of 130° C., an outlet temperature of 80° C., a feed rate of 10 mL / min, and a nozzle diameter of 1 mm set. The dried particles were collected and stored in a drying oven at 40-50° C. to dry to constant weight to obtain a modified regulator. Add water to mannitol and betaine, heat and stir at 60°C until completely dissolved to obtain a basic solution. After the basic solution is cooled, add a modified regulator, sucrose ester, naphthaleneacetic acid, gibberellic acid, 6-benzylaminopurine, and vitamin C in sequence, stir and mix thoroughly to obtain a plant growth regulator for saline-alkali land improvement.
[0025] Comparative Example 1: The method of Example 2 was adopted without adding a modifying regulator.
[0026] Comparative Example 2: The method of Example 2 was adopted, and indoleacetic acid was used directly without modifying the indoleacetic acid by sodium lignin sulfonate and millet gum.
[0027] Comparative Example 3: The method of Example 2 was adopted, and indoleacetic acid and sodium lignin sulfonate were directly used without modifying indoleacetic acid and sodium lignin sulfonate by millet gum.
[0028] The present invention uses a modified regulator to prepare a plant growth regulator for improving saline-alkali land. The performance index test items and test standards of the plant growth regulator for improving saline-alkali land are as follows: Corn seeds were sown in saline-alkali soil with a plant spacing of 20 cm and a row spacing of 50 cm. After sowing the corn, drip irrigation was carried out with a 3000-fold diluted plant growth regulator for saline-alkali soil improvement. The amount of the plant growth regulator for saline-alkali soil improvement was 1% of the weight of the corn seeds. The emergence rate on the 7th day after sowing, the root length 14 days after sowing, and the plant height and stem diameter at the heading stage were observed.
[0029] The plant growth regulators for improving saline-alkali land prepared in Examples 1-5 and Comparative Examples 1-3 were tested using the above standards, and the obtained data are shown in Table 1: Table 1 Performance data of Examples 1-5 and Comparative Examples 1-3 The above data fully demonstrate that Examples 1-5, compared with Comparative Examples 1-3, can fully show the effect of the modified regulator on the plant growth regulator for saline-alkali land improvement in terms of salt resistance and plant growth promotion.
[0030] Since the present invention adopts a modified regulator to prepare a plant growth regulator for improving saline-alkali land, the performance of the plant growth regulator for improving saline-alkali land is effectively improved by the modified regulator, as follows: It can be seen from Examples 1-3 that as the content of the modified regulator continues to increase, the salt-alkali resistance and plant growth promotion performance of the plant growth regulator first increases and then decreases, indicating that the addition of the modified regulator helps to enhance the tolerance of plants to saline-alkali environments and can better promote plant growth. This is because the sodium lignin sulfonate in the modified regulator has a sustained release effect, allowing ingredients such as indoleacetic acid to be continuously released over a longer period of time, thereby providing a more stable growth stimulation for the plant. However, when the content of the modified regulator is too high, its effect will be weakened. This is because excessive plant growth regulator will inhibit plant growth, leading to abnormal plant growth or symptoms of phytotoxicity. Therefore, within a certain range, the addition of the modified regulator helps to enhance the salt-alkali resistance of plants and promote plant growth.
[0031] It can be seen from Examples 2, 4 and 5 that with the continuous changes in the content of other components in the plant growth regulator and the changes in the proportion of the modified regulator component, the salt-alkali resistance and plant growth promotion performance of the plant growth regulator do not change significantly, indicating that small changes in the proportion of other components and modified regulator components within a certain range are not sufficient to significantly affect the salt-alkali resistance and plant growth promotion performance of the plant growth regulator.
[0032] According to the above test experiments, the plant growth regulator for improving saline-alkali land prepared according to Example 2 has the best performance, so Example 2 is taken as the best example; By comparing Example 2 with Comparative Examples 1-3, it can be seen that: In comparative example 1, no modified regulator was added. The salt-alkali resistance and plant growth promotion performance of the plant growth regulator were worse, indicating that the modified regulator was a key component affecting plant growth and salt-alkali resistance. The absence of the modified regulator meant that the key component lacked an effective protection mechanism for plants, thereby reducing the effect of the entire formula.
[0033] In Comparative Example 2, indoleacetic acid was directly used without modification by sodium lignin sulfonate and millet gum. The salt-alkali resistance and plant growth promotion performance of the plant growth regulator were poor. This is because the untreated indoleacetic acid is more susceptible to decarboxylation in a saline-alkali environment, losing its biological activity, resulting in the indoleacetic acid being unable to exert its effective effect. It also shows that sodium lignin sulfonate can protect indoleacetic acid from maintaining its activity under adverse conditions, so the effect of the plant growth regulator is poor.
[0034] Comparative Example 3 directly uses indoleacetic acid and sodium lignin sulfonate, and does not modify indoleacetic acid and sodium lignin sulfonate by millet colloid. Since millet colloid can further protect the composite particles, reduce the chance of alkaline substances directly contacting the composite particles, and can be decomposed as plant nutrients, thereby enhancing the effect of the plant growth regulator, the lack of millet colloid affects the stability of the sodium lignin sulfonate itself in a high pH environment, thereby weakening the effect of the plant growth regulator.
[0035] In summary, the modified regulator is composed of indoleacetic acid, sodium lignin sulfonate and millet gum. It utilizes the high specific surface area and multiple active groups of sodium lignin sulfonate to form hydrogen bonds with indoleacetic acid to form a stable complex, thereby achieving effective protection of indoleacetic acid. The good film-forming property of millet gum is utilized to effectively wrap the composite particles, which not only enhances the protection effect of indoleacetic acid from environmental factors, but also prolongs its release time in the soil, ensuring the slow release of indoleacetic acid, and can continuously provide the growth stimulation required by plants for a long time, help plants establish stronger root systems, and improve plants' tolerance to saline-alkali environments, thereby improving the use efficiency of plant growth regulators.
[0036] The basic principles, main features, and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the invention claimed.
Claims
1. A plant growth regulator for improving saline-alkali land, characterized in that: The invention comprises the following components: 0.08-0.12 parts by weight of a modification regulator, 0.14-0.18 parts by weight of a sucrose ester, 0.04-0.06 parts by weight of naphthaleneacetic acid, 0.12-0.18 parts by weight of gibberellic acid, 0.03-0.05 parts by weight of 6-benzylaminopurine, 0.8-1 parts by weight of vitamin C, 1-5 parts by weight of mannitol, 1-3 parts by weight of betaine, and the remainder being water; The modified regulator is prepared by surface modification of indoleacetic acid, sodium lignin sulfonate and millet gum in a mass ratio of 1:5-10:1.5-4.
5.
2. The plant growth regulator for improving saline-alkali land according to claim 1, characterized in that: The preparation method of the modified regulator is as follows: Sodium ligninsulfonate is weighed and dissolved in distilled water to form a sodium ligninsulfonate aqueous solution, indoleacetic acid is dissolved in ethanol to form an indoleacetic acid solution, and the indoleacetic acid solution is then added dropwise to the sodium ligninsulfonate solution, and the pH of the solution is adjusted during the mixing process. Stirring is continued, the mixed solution is poured into a spray dryer, and the inlet temperature, outlet temperature, feed rate and nozzle diameter are set. The dried particles are collected and stored in a drying oven at 40-50° C. and dried to constant weight to obtain composite particles; Millet colloid is prepared into a millet colloid solution with a concentration of 12-18% w / v, the composite particles are added into a fluidized bed container and fully fluidized, and then the millet colloid solution is loaded into a spray system, the inlet air temperature, outlet air temperature, spray rate, and nozzle inner diameter of the fluidized bed are set, and the spraying is continued while hot air at 40-60°C is introduced for 30-50 minutes. After the spraying is completed, the hot air is continued to be introduced for 10-15 minutes to obtain a modified regulator.
3. The plant growth regulator for improving saline-alkali land according to claim 2, characterized in that: The mass fraction of the sodium lignin sulfonate aqueous solution is 5-10%.
4. The plant growth regulator for improving saline-alkali land according to claim 2, characterized in that: The mass fraction of the indoleacetic acid solution is 0.1-1%.
5. The plant growth regulator for improving saline-alkali land according to claim 2, characterized in that: The pH of the mixed solution is maintained at 6-7.
6. The plant growth regulator for improving saline-alkali land according to claim 2, characterized in that: The inlet temperature of the spray dryer is 120-140° C., the outlet temperature is 70-80° C., the feed rate is 10-20 mL / min, and the nozzle diameter is 0.5-2 mm.
7. The plant growth regulator for improving saline-alkali land according to claim 2, characterized in that: The concentration of the millet colloid solution is 12-18% w / v.
8. The plant growth regulator for improving saline-alkali land according to claim 2, characterized in that: The fluidized bed has an air inlet temperature of 40-60° C., an air outlet temperature of 30-40° C., a spray rate of 1-5 mL / min, and a nozzle inner diameter of 0.5-1.0 mm.
9. A method for preparing a plant growth regulator for improving saline-alkali land, for preparing the plant growth regulator for improving saline-alkali land according to any one of claims 1 to 8, characterized in that: The steps include: Add water to mannitol and betaine, heat and stir until completely dissolved to obtain a basic solution. After the basic solution is cooled, add a modified regulator, sucrose ester, naphthaleneacetic acid, gibberellic acid, 6-benzylaminopurine, and vitamin C in sequence, stir and mix thoroughly to obtain a plant growth regulator for saline-alkali land improvement.
10. The method for preparing the plant growth regulator for improving saline-alkali land according to claim 9, characterized in that: The heating temperature is 40-60°C.