Activated fertilizer myxomycete fresh-keeping coating agent, preparation method of activated fertilizer myxomycete fresh-keeping coating agent, activated fertilizer and application of activated fertilizer

Abstract

The invention discloses an activated fertilizer myxomycete fresh-keeping coating agent and a preparation method thereof as well as an activated fertilizer and application thereof, relates to the technical field of preparation of activated fertilizer coating agents by a mixing process, and aims to solve the problems that in the prior art, the survival rate of strains is generally low, the coating stability is poor, and the coating effect is poor. Particularly, a coating agent capable of fully exerting the actual effect of the strain is needed. The invention discloses an activated fertilizer myxomycete preservation coating agent which is prepared from the following raw materials in parts by weight: 20 to 40 parts of polyacrylamide, 10 to 20 parts of xanthan gum, 5 to 10 parts of hydroxypropyl methylcellulose, 5 to 10 parts of glucose powder, 5 to 10 parts of white granulated sugar, 3 to 10 parts of preservative BIT-10, 1 to 3 parts of organic ammonia regulator AMP-95, 10 to 20 parts of ethanol and 10 to 30 parts of water. According to the invention, the survival rate of strains in the microbial fertilizer is increased, the falling rate of flora is reduced, the tolerance of the microbial fertilizer to the environment is increased, the production cost is greatly reduced, and the nitrogen content of the fertilizer is not lost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of preparing activated fertilizer coating agents by a hybrid process, in particular to an activated fertilizer mycological preservation coating agent, a preparation method thereof and an activated fertilizer and application thereof. BACKGROUND

[0002] Microbial fertilizer is a biological fertilizer formed by industrialized cultivation and fermentation of one or more beneficial microorganisms. Microbial agents are susceptible to environmental influences in natural environments, especially changes in temperature, humidity, and light conditions. The use of coating technology can protect microbial strains to some extent, improve their survival rate and survival ability in adverse environments, and thus better exert their functions.

[0003] In the production process of traditional coating agents, the survival rate of strains is generally low due to high-temperature treatment and the limitation of coating materials, usually about 10%, and the coating stability is poor. Such low survival rate leads to poor effects of strains in actual application, which cannot fully exert their functions.

[0004] The main problems of the prior art are summarized from the following aspects: 1. Insufficient interfacial bonding force: traditional physical adsorption method (such as oil-like mycological product) relies on van der Waals force, which is much lower than the bonding strength of chemical bonds. Laboratory data shows that under simulated transportation vibration conditions (frequency 5-15 Hz), the shedding rate of physical adsorption bacterial population is as high as 35-60%, which significantly affects the stability of the product; 2. Process damage: granulation and drying temperature > 40℃ leads to heat stress inactivation of bacterial bodies (survival rate decreases by 28%-35%), plus the toxicity of organic solvents contained in the current products, and some coating processes use solvents such as ethyl acetate, resulting in bacterial membrane damage rate > 30%; 3. Poor environmental tolerance: fluctuations in temperature and humidity during the storage and logistics of bacterial fertilizer, photosynthetic bacteria affected by photooxidation, and more than 80% decrease in activity within 60 days. In addition, in the field application process, soil pH adaptability and chemical pesticide antagonism, ultraviolet radiation can greatly reduce the final energy efficiency of bacterial fertilizer. SUMMARY

[0005] In view of the above problems, the present application aims to provide an activated fertilizer mycological preservation coating agent, a preparation method thereof and an activated fertilizer and application thereof, which can increase the number of coated bacterial strains and the survival rate of bacterial strains, reduce the shedding rate of bacterial bodies, reduce heat damage, improve environmental adaptability, and improve the survival rate of bacterial strains and the compression strength of the coating.

[0006] To achieve the above purpose, the technical solutions adopted by the present application are as follows: The application provides an activated fertilizer mycoparasite fresh-keeping coating agent, and raw material components are as follows in percentage by weight: 20-40 parts of polyacrylamide, 10-20 parts of xanthan gum, 5-10 parts of hydroxypropyl methyl cellulose, 5-10 parts of glucose powder, 5-10 parts of white granulated sugar, 3-10 parts of preservative BIT-10, 1-3 parts of organic ammonia regulator AMP-95, 10-20 parts of ethanol and 10-30 parts of water.

[0007] Further, raw material components are as follows in percentage by weight: 20 parts of polyacrylamide, 10 parts of xanthan gum, 10 parts of hydroxypropyl methyl cellulose, 5 parts of glucose powder, 5 parts of white granulated sugar, 10 parts of preservative BIT-10, 3 parts of organic ammonia regulator AMP-95, 10 parts of ethanol and 27 parts of water.

[0008] Further, raw material components are as follows in percentage by weight: 30 parts of polyacrylamide, 20 parts of xanthan gum, 5 parts of hydroxypropyl methyl cellulose, 8 parts of glucose powder, 6 parts of white granulated sugar, 4 parts of preservative BIT-10, 2 parts of organic ammonia regulator AMP-95, 15 parts of ethanol and 10 parts of water.

[0009] The application further provides a preparation method of the activated fertilizer mycoparasite fresh-keeping coating agent, and specific steps are as follows: S1, polyacrylamide, xanthan gum and glucose powder are mixed to obtain powder No. 1, and hydroxypropyl methyl cellulose and white granulated sugar are mixed to obtain powder No. 2; S2, 45% water is injected into a stirrer, powder No. 1 is added, and stirring is carried out at 800 rpm for 30 min to prepare a saturated liquid No. 1; S3, another stirrer is injected with 20% water, powder No. 2 is added, and stirring is carried out at 800 rpm for 30 min to prepare a saturated liquid No. 2; S4, the saturated liquid No. 1 is slowly poured into the saturated liquid No. 2, stirring is carried out at 400 rpm for 20 min, preservative BIT-10, organic ammonia regulator AMP-95 and ethanol are sequentially added, and stirring is continuously carried out for 20 min, and then filtration and filling are carried out.

[0010] Further, after storage at-15℃ to-20℃ for 30 days, the coating is applied The application further provides an activated fertilizer prepared by using the above-mentioned activated fertilizer mycoparasite fresh-keeping coating agent, the coating agent is mixed with the fertilizer at a ratio of 5‰ to 10‰, and natural air drying is carried out at 10 to 30℃ to form a coating layer with a thickness of 10 to 30 microns.

[0011] Further, the fertilizer is a bacillus subtilis fertilizer, and the coating agent is added in an amount of 8‰.

[0012] The application further provides application of the above-mentioned activated fertilizer in saline-alkali soil.

[0013] Furthermore, the pH value of the saline-alkali land is 8.5, and the EC value is 4.5 mS / cm.

[0014] The beneficial effects of this invention are: compared with the prior art, the improvement of this invention lies in that... ① By mixing polyacrylamide, xanthan gum, and glucose powder, on the one hand, xanthan gum increases the viscosity of the coating agent, thereby improving the interfacial bonding energy between xanthan gum and polyacrylamide composite network, which in turn increases the stability of the microbial community in the microbial fertilizer and reduces the shedding rate of the microbial community; on the other hand, glucose powder improves the survival rate of the microbial strains in the microbial fertilizer. ② By mixing hydroxypropyl methylcellulose with white sugar, the viscosity of the coating agent is increased, the film-forming property is improved, and the shedding of microbial flora in the microbial fertilizer is prevented. ③ Xanthan gum enables microbial fertilizers to withstand high temperatures, strong acids and alkalis, and high salts; hydroxypropyl methylcellulose enables microbial fertilizers to withstand pH changes and resist mold; the preservative BIT-10 enhances the coating agent's ability to drive shelf life, thereby preventing spoilage; the organic ammonia regulator AMP-95 helps improve the long-term survival of the microbial strains; ethanol effectively prevents the product from freezing in winter and improves product utilization; through the above components, the microbial fertilizer's tolerance to the environment is increased, as well as the retention rate of photosynthetic bacteria activity after 60 days of UV irradiation is increased. ④ The process of preparing activated fertilizer using activated fertilizer slime mold preservative coating agent involves natural air drying at 10-30℃ to form a 10-30μm coating layer. Low-temperature film formation avoids heat damage, thereby improving the survival rate of microbial strains in the microbial fertilizer. This invention improves the number of microbial cells encapsulated and the survival rate of the microorganisms, resulting in cells that do not lose their microbial composition, do not pulverize, and exhibit good frost resistance and thermoplasticity. Through physical mixing at room temperature, the preparation process does not affect the microorganisms, extending the energy efficiency time of the microbial fertilizer and allowing its energy efficiency to be fully realized. Simultaneously, it significantly reduces production costs and saves on fertilization costs. Attached Figure Description

[0015] Figure 1 This is a comparison chart of the 30-day survival rate curves of the bacterial strains in the coating agent of this invention and traditional slime mold agents; Figure 2 Fertilizer granules without added slime mold preservative coating agent; Figure 3 Fertilizer granules containing the activated fertilizer slime mold preservative coating agent of this invention; Figure 4 The 20-day corn seedling height is shown in Example 3; Figure 5 The 20-day corn seedling height was compared with that of Comparative Example 3; Figure 6 The 40-day corn seedling height is shown in Example 3; Figure 7 The height of corn seedlings at 40 days was compared with that of Comparative Example 3; Figure 8 The 60-day corn seedling height is shown in Example 3; Figure 9 The height of corn seedlings at 60 days is compared with that of control example 3. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0017] The inventors discovered that existing microbial fertilizer strains have low survival rates and poor coating stability. In particular, there is a need for a coating agent that can increase the number of microorganisms coated and the survival rate of the strains, and also has good environmental adaptability.

[0018] Based on the above findings, this application proposes an activated fertilizer slime mold preservative coating agent and its preparation method, as well as an activated fertilizer and its application, which increases the number of microorganisms coated and the survival rate of the microorganisms, reduces the shedding rate of the microorganisms, reduces heat damage, and improves environmental tolerance. Example 1

[0019] An activated fertilizer slime mold preservation coating agent, the raw materials are composed of the following parts by weight: 20 parts polyacrylamide, 10 parts xanthan gum, 10 parts hydroxypropyl methylcellulose, 5 parts glucose powder, 5 parts white sugar, 10 parts preservative BIT-10, 3 parts organic amine regulator AMP-95, 10 parts ethanol, and 27 parts water.

[0020] The preparation method of the above-mentioned activated fertilizer slime mold preservative coating agent includes the following specific steps: S1. Mix polyacrylamide, xanthan gum, and glucose powder to obtain powder No. 1; mix hydroxypropyl methylcellulose and white sugar to obtain powder No. 2. S2. Pour 45% water into the mixer, add powder No. 1, and stir at 800 rpm for 30 min to obtain saturated liquid No. 1. S3. In a separate mixer, add 20% water and powder No. 2, and stir at 800 rpm for 30 minutes to obtain saturated liquid No. 2. S4: Slowly pour saturated liquid No. 1 into saturated liquid No. 2, stir at 400 rpm for 20 min, add preservative BIT-10, organic ammonia regulator AMP-95 and ethanol in sequence, continue stirring for 20 min, then filter and fill.

[0021] Store at -15℃ for 30 days before applying with a coating.

[0022] The Bacillus subtilis fertilizer is coated with a coating agent at a dosage of 8‰. It is then air-dried at 10–30℃ to form a 10–30μm coating layer. The slime mold preservative coating agent firmly adheres the fertilizer to the bacteria.

[0023] It is used for saline-alkali land with a pH of 8.5 and an EC value of 4.5 mS / cm. Example 2

[0024] An activated fertilizer slime mold preservation coating agent, the raw materials are composed of the following parts by weight: 40 parts polyacrylamide, 20 parts xanthan gum, 10 parts hydroxypropyl methylcellulose, 10 parts glucose powder, 10 parts white sugar, 10 parts preservative BIT-10, 3 parts organic amine regulator AMP-95, 20 parts ethanol, and 30 parts water.

[0025] The preparation method of the above-mentioned activated fertilizer slime mold preservative coating agent includes the following specific steps: S1. Mix polyacrylamide, xanthan gum, and glucose powder to obtain powder No. 1; mix hydroxypropyl methylcellulose and white sugar to obtain powder No. 2. S2. Pour 45% water into the mixer, add powder No. 1, and stir at 800 rpm for 30 min to obtain saturated liquid No. 1. S3. In a separate mixer, add 20% water and powder No. 2, and stir at 800 rpm for 30 minutes to obtain saturated liquid No. 2. S4: Slowly pour saturated liquid No. 1 into saturated liquid No. 2, stir at 400 rpm for 20 min, add preservative BIT-10, organic ammonia regulator AMP-95 and ethanol in sequence, continue stirring for 20 min, then filter and fill.

[0026] Store at -15℃ for 30 days before applying with a coating.

[0027] The Bacillus subtilis fertilizer is coated with a coating agent at a dosage of 8‰. It is then air-dried at 10–30℃ to form a 10–30μm coating layer. The slime mold preservative coating agent firmly adheres the fertilizer to the bacteria.

[0028] It is used for saline-alkali land with a pH of 8.5 and an EC value of 4.5 mS / cm. Example 3

[0029] An activated fertilizer slime mold preservation coating agent, the raw materials are composed of the following parts by weight: 30 parts polyacrylamide, 20 parts xanthan gum, 5 parts hydroxypropyl methylcellulose, 8 parts glucose powder, 6 parts white sugar, 4 parts preservative BIT-10, 2 parts organic amine regulator AMP-95, 15 parts ethanol, and 10 parts water.

[0030] The preparation method of the above-mentioned activated fertilizer slime mold preservative coating agent includes the following specific steps: S1. Mix polyacrylamide, xanthan gum, and glucose powder to obtain powder No. 1; mix hydroxypropyl methylcellulose and white sugar to obtain powder No. 2. S2. Pour 45% water into the mixer, add powder No. 1, and stir at 800 rpm for 30 min to obtain saturated liquid No. 1. S3. In a separate mixer, add 20% water and powder No. 2, and stir at 800 rpm for 30 minutes to obtain saturated liquid No. 2. S4: Slowly pour saturated liquid No. 1 into saturated liquid No. 2, stir at 400 rpm for 20 min, add preservative BIT-10, organic ammonia regulator AMP-95 and ethanol in sequence, continue stirring for 20 min, then filter and fill.

[0031] Store at -20℃ for 30 days before applying with a coating.

[0032] Coated Bacillus subtilis fertilizer, with a coating agent addition of 8‰, is naturally air-dried at 10–30℃ to form a 10–30 μm coating layer. Figure 2 and Figure 3 The slime mold preservative coating agent of the present invention shown firmly adheres the microbial fertilizer.

[0033] It is used for saline-alkali land with a pH of 8.5 and an EC value of 4.5 mS / cm.

[0034] Comparative Example 1 A coating agent for microbial fertilizers, comprising the following raw materials by weight: 60 parts vegetable oil, 15 parts paraffin wax, and 25 parts stearic acid.

[0035] The specific steps for preparing the above-mentioned coating agent for microbial fertilizers are as follows: Preheat refined vegetable oil to 70°C, add molten paraffin and stearic acid, and emulsify at 8000 rpm for 30 minutes at a temperature of 160-180°C.

[0036] The coating agent for the Bacillus subtilis fertilizer is added at a rate of 8‰. The coating solution is cooled to below 45°C and mixed with freeze-dried Bacillus subtilis powder. The mixed slurry is atomized through a pressure nozzle and sprayed into a 5°C cold air chamber for instantaneous solidification, forming microcapsule particles with a particle size of 300-500μm, forming a coating layer of 200-500μm.

[0037] Comparative Example 2 A coating agent for microbial fertilizers, comprising the following raw materials by weight: 3 parts sodium alginate, 50 parts compound vegetable oil, 20 parts humic acid, 5 parts seaweed oligosaccharide, 10 parts sodium caseinate, 1 part glucose, and 11 parts water.

[0038] The specific steps for preparing the above-mentioned coating agent for microbial fertilizers are as follows: Sodium alginate and compound vegetable oil were emulsified at 50°C, and glucose and sodium caseinate were added to form a homogeneous solution. Add ≥20% humic acid, 5% seaweed oligosaccharide and water, and disperse at high speed of 8000 rpm for 30 minutes.

[0039] Coated Bacillus subtilis fertilizer, with a coating agent addition of 8‰, involves adding freeze-dried Bacillus subtilis powder to the coating solution to form gel microspheres with a diameter of 500-800 μm. Fluidized bed drying is then employed, with an inlet air temperature of 150-180℃ and an outlet air temperature of 50-65℃, reducing the moisture content to ≤5% and achieving a film thickness of 200-500 μm.

[0040] Comparative Example 3 A coating agent for microbial fertilizer comprises the following components by weight: 28 parts sucrose, 0.5 parts ascorbic acid, 10 parts collagen gel, 1 part sodium lactate, 1.5 parts glycerol, and 2 parts agar.

[0041] The specific steps for preparing the above-mentioned coating agent for microbial fertilizers are as follows: The sucrose was ground to obtain mixture A; Ascorbic acid, collagen gel, and agar were mixed to obtain mixture B, which was then mixed in a mixer at a temperature of 50-60℃ for 20 minutes. Continue mixing mixture A and mixture B in a mixer at a temperature of 30-50°C for 20 minutes. Sodium lactate and glycerol were added to mixture A and mixture B and mixed at room temperature for 10 minutes.

[0042] The Bacillus subtilis-coated fertilizer, with a coating agent addition of 8‰, is naturally air-dried at 10–30℃ to form a coating layer of 200–1000 μm.

[0043] Experimental Example 1 Specific experimental data: ①Basic conditions of the test soil: saline-alkali soil with a pH value of 8.5 and an EC value of 4.5 mS / cm.

[0044] ② Experimental location: Corn planting area in Cangzhou, Hebei Province. A total of 6 experimental plots of 0.5 mu each were divided into six plots, corresponding to Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, and Comparative Example 3, respectively.

[0045] ③ Test subject: Salt-tolerant corn variety "Jingke 968" ④ Experiment period: Sowing began on April 22 and lasted for 60 days.

[0046] First, before sowing, corresponding Bacillus subtilis-coated fertilizers were applied to the six experimental plots to alleviate salt damage. After sowing, it was important to note that Jingke 968 has weak waterlogging resistance; therefore, it was necessary to ensure that there was no standing water in the fields during rain. After emergence, the density of corn seedlings was controlled at 4200 plants / acre. Soil conditions, corn emergence rate, and seedling height were monitored using the well-known five-point sampling method. Please refer to [link to relevant documentation]. Figures 1-9 .

[0047] 1. The following experimental data were obtained regarding adaptability to high-salinity soils: (1) Table 1. Survival rates of the strains in the examples and comparative examples:

[0048] (2) Nutrient release rates of the examples and comparative examples in Table 2:

[0049] (3) Table 3: Dropping rate of strains in the examples and comparative examples:

[0050] As shown in Tables 1 to 3, the present invention can significantly increase the number of microbial fertilizers coated in granular fertilizers, and also significantly improve the survival rate of microorganisms. Nutrient release can be sustained for a longer period of time. It has the characteristics of low sterilization rate, non-powdering of granules, good frost resistance and thermoplasticity.

[0051] By using a physical, room-temperature mixing method, the addition process will not affect the microorganisms. The low-temperature film-forming process avoids heat damage, resulting in high microbial survival rates, reduced strain shedding rates, and lower costs.

[0052] 2. Table 4: Germination rate and seedling height of Example 3 and Comparative Example 3:

[0053] As shown in Table 4, the germination rate of the present invention is higher than that of Comparative Example 3, and the seedling height of the present invention is 13 cm higher than that of Comparative Example 3 on the 60th day, indicating that the efficiency of the microbial fertilizer is fully utilized.

[0054] Therefore, it can be seen that the present invention improves the survival rate of microorganisms in high-salt soil, reduces the shedding rate of microbial communities, maintains an activity retention rate of ≥70% after 60 days of ultraviolet irradiation, and allows for a gradual increase in nutrient release rate while delaying nutrient release time. The energy efficiency of the microbial fertilizer is fully utilized, and it significantly improves the emergence rate and seedling height of crops.

[0055] Furthermore, compared to the comparative examples, the embodiments of the present invention require a high-speed shearing process at 8000 rpm for 30 minutes in both Comparative Examples 1 and 2, which increases the requirements for the equipment used to prepare the coating agent and raises production costs. Additionally, the coating layer in the comparative examples is relatively thick, which delays the release of the bio-fertilizer's energy in the initial stages of fertilization. Moreover, for the same particle size, the comparative examples contain less fertilizer components than the present invention, resulting in lower bio-fertilizer energy efficiency and thus increasing fertilization costs. Therefore, the present invention reduces both production costs and fertilization costs.

[0056] Experiment Example 2 3. The following experimental data were obtained from the low-temperature antifreeze performance test: A temperature gradient was set: 50℃→40℃→30℃→20℃→10℃→5℃→0℃→-10℃→-15℃→20℃, and each stage was maintained for 24 hours. The changes in the number of viable bacteria in the microbial fertilizer were measured.

[0057] Table 5 Environmental tolerance of the examples and comparative examples:

[0058] As shown in Table 5, the present invention can withstand temperature fluctuations of -20 to 50°C, and its environmental tolerance is significantly better than that of the comparative example; it can effectively prevent the product from freezing in winter and has good antifreeze properties, thus ensuring the energy efficiency of the microbial fertilizer.

[0059] In summary, this invention improves the survival rate of the strain, reduces the shedding rate of the strain, reduces heat damage, exhibits good environmental adaptability, improves the germination rate of crops, thereby increasing crop yield, while reducing production costs and saving on fertilizer costs.

[0060] 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, improvements, etc., made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An activated fertilizer slime mold preservative coating agent, characterized in that, The raw material composition by weight is as follows: 20-40 parts polyacrylamide, 10-20 parts xanthan gum, 5-10 parts hydroxypropyl methylcellulose, 5-10 parts glucose powder, 5-10 parts white sugar, 3-10 parts preservative BIT-10, 1-3 parts organic amine regulator AMP-95, 10-20 parts ethanol, and 10-30 parts water.

2. The activated fertilizer slime mold preservative coating agent according to claim 1, characterized in that, The raw material composition by weight is as follows: 20 parts polyacrylamide, 10 parts xanthan gum, 10 parts hydroxypropyl methylcellulose, 5 parts glucose powder, 5 parts white sugar, 10 parts preservative BIT-10, 3 parts organic amine regulator AMP-95, 10 parts ethanol, and 27 parts water.

3. The activated fertilizer slime mold preservative coating agent according to claim 1, characterized in that, The raw material composition by weight is as follows: 30 parts polyacrylamide, 20 parts xanthan gum, 5 parts hydroxypropyl methylcellulose, 8 parts glucose powder, 6 parts white sugar, 4 parts preservative BIT-10, 2 parts organic amine regulator AMP-95, 15 parts ethanol, and 10 parts water.

4. The preparation method of the activated fertilizer slime mold preservative coating agent according to claim 1, characterized in that, The specific steps are as follows: S1. Mix polyacrylamide, xanthan gum, and glucose powder to obtain powder No. 1; mix hydroxypropyl methylcellulose and white sugar to obtain powder No.

2. S2. Pour 45% water into the mixer, add powder No. 1, and stir at 800 rpm for 30 min to obtain saturated liquid No.

1. S3. In a separate mixer, add 20% water and powder No. 2, and stir at 800 rpm for 30 minutes to obtain saturated liquid No.

2. S4: Slowly pour saturated liquid No. 1 into saturated liquid No. 2, stir at 400 rpm for 20 min, add preservative BIT-10, organic ammonia regulator AMP-95 and ethanol in sequence, continue stirring for 20 min, then filter and fill.

5. The preparation method of the activated fertilizer slime mold preservative coating agent according to claim 4, characterized in that, Store at -15℃~-20℃ for 30 days before applying with a coating.

6. An activated fertilizer prepared using the activated fertilizer slime mold preservative coating agent as described in claim 1, characterized in that, Mix the coating agent with the microbial fertilizer at a ratio of 5‰ to 10‰ and air dry naturally at 10 to 30°C to form a coating layer of 10 to 30 μm.

7. The activated fertilizer according to claim 6, characterized in that, The microbial fertilizer uses Bacillus subtilis fertilizer, and the coating agent is added at a rate of 8‰.

8. The application of the activated fertilizer as described in claim 7 in saline-alkali land.

9. The application according to claim 9, characterized in that, The pH value of the saline-alkali land is 8.5, and the EC value is 4.5 mS / cm.

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