Saline-alkali-resistant moisturizing preparation for promoting germination of seeds in saline-alkali soil as well as preparation method and application

Abstract

The invention discloses a saline-alkali-resistant moisturizing preparation for promoting germination of seeds in saline-alkali soil as well as a preparation method and an application of the saline-alkali-resistant moisturizing preparation. The salt and alkali resistant moisturizing preparation is prepared from the following raw materials in percentage by weight: 8 to 15 percent of mineral source potassium fulvate, 5 to 10 percent of sodium polyacrylate, 0.5 to 2 percent of sugar alcohol chelated zinc, 0.1 to 0.5 percent of indolebutyric acid, 0.2 to 0.8 percent of sodium polycarboxylate, 0.1 to 0.3 percent of sodium benzoate and the balance of water. By scientifically compounding the mineral source potassium fulvate, the water-soluble high-molecular polymer and the bioactive components, efficient germination of seeds in the saline-alkali soil and stress-resistant growth of seedlings are achieved, and the method is suitable for precise water supplementing scenes such as drip irrigation and spray irrigation.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of agricultural saline-alkali soil improvement, and particularly relates to a salt-alkali resistant water supplementing preparation for promoting seed germination in saline-alkali soil, a preparation method and application thereof. BACKGROUND

[0002] In the saline-alkali soil area, promoting seed germination is the core link to break through the bottleneck of agricultural production. The high salinity (conductivity often exceeds 8 dS / m), high pH (≥8.5) and rapid loss of soil moisture (water holding rate of sand is less than 15%) in the region lead to seed water absorption obstruction, ion toxicity and physiological drought, and the emergence rate of crops such as cotton and wheat is generally less than 50%, which seriously threatens food security and ecological stability. Improving the seed germination rate can not only directly increase crop yield, but also reduce soil erosion through vegetation cover, achieving the synergy of ecological restoration and agricultural development.

[0003] Many technologies have been developed to improve the germination rate of seeds in saline-alkali soil. They include: 1. Physical improvement technology. Engineering measures represented by underground pipe salt drainage and drip irrigation under film can reduce the surface salt content by leaching and blocking capillary action, which can reduce the soil conductivity by 40-60%, but there are problems of high investment cost and large water resource consumption, which limits the promotion in the arid region of northwest China.

[0004] 2. Chemical improvement agent. It includes: (1) Water-retaining agent: high molecular materials such as polyacrylamide can absorb water through three-dimensional network structure, which can improve the soil water holding capacity to 200-300 times of its own weight, but the salt resistance is weak, and the effect decreases by 30% in severe saline-alkali land with conductivity >10 dS / m; (2) Acid-base regulator: gypsum (CaSO4) can replace Na + in soil to reduce pH value, and can reduce salinity by 50% in combination with humic acid, but long-term use can easily lead to soil compaction.

[0005] 3. Biological agent. It includes: (1) Microbial agent: Bacillus subtilis and other microorganisms can dissolve salt by secreting organic acid, and at the same time improve the soil aggregate structure. Field test shows that the application of microbial agent can reduce the soil conductivity by 25-35%, and the cotton emergence rate can be increased to more than 75%; (2) Polyglutamic acid (γ-PGA): through carboxyl adsorption of Na + and adjustment of osmotic pressure, in combination with rooting agent, the critical salt concentration for wheat seed germination can be increased from 8 dS / m to 15 dS / m, and the root activity of seedlings can be increased by 140-172%.

[0006] However, there are still some bottlenecks in the existing technology that need to be broken through. First, the long-acting property of chemical modifiers is insufficient, with a holding period usually less than 3 months, which requires frequent application and increases costs. Second, the regional adaptability of the product is poor. The soil characteristics in the Northeast soda saline-alkali area are significantly different from those in the Northwest arid saline-alkali area, and the existing technology is difficult to be universally applicable. Third, excessive use of polyacrylamide and other substances may lead to imbalance of soil microbial community structure and pose ecological risks.

[0007] Therefore, the future development direction of related products is as follows: 1) Focus on composite technology integration: develop a ternary system of "polyglutamic acid + microbial inoculant + nano slow-release carrier" to achieve the synergistic effect of water retention, salt resistance, and growth promotion. For example, embedding Bacillus subtilis in γ-PGA microspheres can increase the survival rate of the microbial inoculant to more than 90% and prolong the holding period to 6 months. 2) Precise regulation technology: use Internet of Things sensors to monitor soil salt content and moisture in real time and dynamically adjust the application scheme of the modifier by combining AI algorithms.

[0008] The Chinese invention patent with the patent number CN201510173952.8 and the invention name "Plastering mortar with diatomite and polyacrylamide as water-retaining agent and its use method" mainly relates to the field of building materials. The plastering mortar is prepared by using diatomite and polyacrylamide, which has excellent water-retaining performance, but does not involve the promotion of seed germination in saline-alkali soil.

[0009] The Chinese invention patent with the patent number CN201610015655.5 and the invention name "Saline-alkali soil conditioner and its preparation method and application" adds chemical fertilizer, earthworm manure, humic acid, gypsum, and mixed microbial inoculant to saline-alkali soil to comprehensively improve the physical, chemical, and biological properties of saline-alkali soil, but does not emphasize the long-acting water-retaining function.

[0010] The Chinese invention patent with the patent number CN105340418B discloses a salt-tolerant seed coating agent with polyvinyl alcohol as a film-forming agent, which only reduces salt intrusion through physical barrier, lacks chemical adsorption and biological degradation mechanisms for soil salt, and the effect significantly decreases in severe saline-alkali soil (EC>8 dS / m); the disclosed salt-tolerant seed coating agent relies on insoluble mineral materials, which is easy to block in drip irrigation systems and the salt adsorption efficiency decreases over time.

[0011] The Chinese invention patent with the patent number CN106417781B discloses a cotton seed coating agent relying on sodium carboxymethyl cellulose matrix, which does not integrate microbial inoculants and mineral adsorption materials, and cannot simultaneously improve the rhizosphere microenvironment and soil structure; the cotton seed treatment agent uses sodium carboxymethyl cellulose matrix, which does not solve the problem of colloidal stability of high molecular polymers in high salt environments.

[0012] The attapulgite composite preparation of the Chinese invention patent with the patent publication number CN112375689A is prone to agglomeration and sedimentation in strong alkaline soil with pH>9 due to poor mineral dispersibility, resulting in loss of effective ingredients.

[0013] The lactic acid bacteria liquid fertilizer of the Chinese invention patent with the patent publication number CN104529612A focuses on adjusting soil microorganisms, but does not solve the key problems of difficult degradation of high molecular materials (such as polyacrylamide) and chelation of salt ions, and long-term application has ecological risks.

[0014] The above-mentioned existing technologies are mainly related to the improvement of saline-alkali soil, and do not involve the use as a seed water supplement. The above-mentioned technologies do not achieve the improvement effect of "full water solubility-high stability-multiple mechanism synergy", and there is an urgent need to develop a new type of water supplement preparation which has components that are completely dissolved, long-term stable, and has the functions of salt adsorption and physiological regulation. At the same time, the above-mentioned existing technologies have defects such as single function, poor environmental adaptability or ecological unfriendliness, and there is an urgent need to develop a new type of preparation which has high efficient salt resistance, ecological safety and precise application. SUMMARY

[0015] The purpose of the present application is to overcome the shortcomings of the prior art, and to provide an anti-saline-alkali water supplement for promoting seed germination in saline-alkali soil, a preparation method and application. The present application realizes efficient seed germination and seedling stress resistance in saline-alkali soil by scientifically compounding potassium fulvic acid from mineral sources, water-soluble polymers and bioactive ingredients, and is suitable for precise water supplementing scenes such as drip irrigation and sprinkler irrigation.

[0016] To achieve the above-mentioned purposes, the technical solutions designed by the present application are as follows: The present application provides an anti-saline-alkali water supplement for promoting seed germination in saline-alkali soil, the raw materials of the anti-saline-alkali water supplement include, by weight percentage, 8-15% of potassium fulvic acid from mineral sources, 5-10% of sodium polyacrylate, 0.5-2% of sugar alcohol chelated zinc, 0.1-0.5% of indole butyric acid, 0.2-0.8% of sodium polycarboxylate, 0.1-0.3% of sodium benzoate, and the balance is water.

[0017] Further, the raw materials of the anti-saline-alkali water supplement include, by weight percentage, 10-15% of potassium fulvic acid from mineral sources, 5-9% of sodium polyacrylate, 1-2% of sugar alcohol chelated zinc, 0.2-0.4% of indole butyric acid, 0.5-0.8% of sodium polycarboxylate, 0.15-0.3% of sodium benzoate, and the balance is water.

[0018] Still further, the raw materials of the anti-saline-alkali water supplement include, by weight percentage, 10% of potassium fulvic acid from mineral sources, 9% of sodium polyacrylate, 1% of sugar alcohol chelated zinc, 0.4% of indole butyric acid, 0.6% of sodium polycarboxylate, 0.15% of sodium benzoate, and the balance is water.

[0019] Further, the humic acid content in the potassium humate is ≥50%; The molecular weight of the sodium polyacrylate is 8-12 million; The Zn content in the sugar alcohol chelated zinc is ≥15%; 2+ The content of the humic acid is ≥50%; The effective ingredient in the indole butyric acid is ≥5%; The conductivity of the water is ≤0.010 dS / m.

[0020] The application further provides a preparation method of the anti-saline-alkali water supplementing preparation. (1) according to the above weight percentage, the potassium humate, sodium polyacrylate, sugar alcohol chelated zinc, indole butyric acid, sodium polycarboxylate, sodium benzoate and water are weighed; (2) the weighed deionized water is preheated to 40-50℃, and the weighed potassium humate is sieved; (3) the sieved potassium humate is added to the preheated deionized water, stirred to form a transparent solution; (4) the weighed sodium polyacrylate is added to the transparent solution, heated to 50-60℃, and then high-speed sheared to form a homogeneous colloid; (5) the temperature is lowered to 28-32℃, the weighed sugar alcohol chelated zinc and indole butyric acid are sequentially added to the homogeneous colloid, and then stirred to obtain a mixed colloid; (6) the weighed sodium polycarboxylate and sodium benzoate are added to the mixed colloid, the pH is adjusted to 6.8-7.2, and a mixture is obtained; (7) the mixture is filtered through three stages to obtain the anti-saline-alkali water supplementing preparation for promoting seed germination in saline-alkali soil.

[0021] Further, in the step (3), the stirring speed is 200-300 rpm, and the stirring time is 25-35 minutes; In the step (4), the high-speed shearing speed is 5000-8000 rpm, and the high-speed shearing time is 20-25 minutes; In the step (5), the stirring speed is 100-120 rpm, and the stirring time is 1-1.5 hours.

[0022] Further, in the step (6), the solution used for adjusting the pH is 4 M potassium hydroxide solution; In the step (7), the three-stage filtration is specifically: filtered through 100 mesh, 50 mesh and 0.45 μm filter membranes respectively.

[0023] Further, the conductivity of the anti-saline and alkaline water supplementing preparation for promoting seed germination in saline and alkaline land is ≤1.5 dS / m, the total number of colonies is ≤100 CFU / mL, and the Zeta potential is-30 mV to-35 mV.

[0024] The application further provides application of the anti-saline and alkaline water supplementing preparation in promoting seed germination of crops in saline and alkaline land, wherein the crops are any one of cotton, wheat and rice.

[0025] Further, the EC value of the saline and alkaline land is 3-12 dS / m.

[0026] Principle of the application: The anti-saline and alkaline water supplementing preparation for promoting seed germination in saline and alkaline land is a composite colloidal system with multiple functions. Sodium polyacrylate is the core carrier of the water retention function, and forms a three-dimensional network hydrophilic structure through high molecular swelling. The molecular chain keeps a dispersed state under the space steric hindrance effect of sodium polycarboxylate, avoiding entanglement and aggregation. Potassium fulvic acid (containing active groups such as humic acid) is uniformly embedded in the high molecular network, and forms nanoscale composite microparticles with sugar alcohol chelated zinc and indole butyric acid, with the Zeta potential maintained at-30 mV to-35 mV. The colloidal stability is ensured by the electrostatic repulsion effect, and the microparticle aggregation is prevented. Trace elements (zinc) exist in the form of sugar alcohol chelate, and plant growth regulators (indole butyric acid) are dispersed in the form of molecules in the colloidal pores, realizing slow release. Sodium polycarboxylate is adsorbed on the particle surface as a dispersant, and sodium benzoate and fulvic acid form a preservative interface layer.

[0027] The product appearance of the anti-saline and alkaline water supplementing preparation for promoting seed germination in saline and alkaline land is a brown-black homogeneous colloidal substance, with good light transmittance. The brown-black color of potassium fulvic acid and the viscous flowability of sodium polyacrylate colloid are combined. After three-stage filtration, no visible impurities are found, meeting the aseptic requirement (total number of colonies ≤100 CFU / mL). The pH is in the neutral range of 6.8-7.2, and the conductivity is ≤1.5 dS / m, ensuring a low-salinity environment to adapt to plant root absorption. The colloidal viscosity is regulated by high-speed shearing process, forming rheological properties suitable for field application (such as uniform dispersibility when spraying or irrigating).

[0028] Advantages of the application: In the present application, the sodium polyacrylate network absorbs moisture through hydrogen bonding and ion exchange, and the hydrophilic groups of potassium fulvic acid further improve the water holding capacity. When water is encountered, it can expand to hundreds of times its own weight, and slowly release water to the plant roots during drought. At the same time, potassium fulvic acid improves the soil aggregate structure, sodium polyacrylate maintains water retention, zinc participates in enzyme synthesis, and indole butyric acid promotes root development, forming a "water-nutrient-growth regulation" trinity functional system, realizing synergistic effect. In addition, the neutral pH environment of the product avoids degradation of the components, and the conductivity control prevents ion interference; relying on the spatial stability of sodium polycarboxylate and Zeta potential regulation, the 37℃ accelerated test verification shows that the degradation rate of the active ingredients is ≤5% within 60 days, improving the stability of the product; the microbial stability is realized through the synergistic bacteriostatic effect of sodium benzoate and potassium fulvic acid, meeting the long-term storage requirements.

[0029] The anti-saline water supplementing preparation of the present application combines high molecular water retention matrix, humic acid natural active ingredients and functional additives to form a stable colloidal system with nanoscale dispersion characteristics, and has multiple functions of water retention, drought resistance, soil improvement, nutrient supply and growth regulation, and is suitable for promoting seed germination of saline-alkali soil crops, water-saving production and crop quality cultivation scenes.

[0030] The anti-saline water supplementing preparation of the present application uses sodium polycarboxylate dispersion technology and sodium benzoate preservative system to ensure long-term stability in the pH range of 6.8-7.2, and is suitable for precise water supplementing scenes such as drip irrigation and sprinkler irrigation. Field tests show that in saline-alkali soil with EC=8-12dS / m, after applying the anti-saline water supplementing preparation of the present application, the seed germination rate can reach 70-85%, and the root activity is improved by more than 50%, which has the characteristics of high efficiency, ecology and convenience, and provides an innovative solution for agricultural production in drought and saline areas. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The preparation process flow chart of the anti-saline water supplementing preparation is shown in the figure; Figure 2 The cotton seed germination rate result graph is shown in the figure; Figure 3 The wheat seed germination rate result graph is shown in the figure; Figure 4 The rice seed germination rate result graph is shown in the figure. DETAILED DESCRIPTION

[0032] The present application will be further described in detail below in conjunction with specific embodiments, so that those skilled in the art can understand.

[0033] Experimental material description 1. Potassium fulvic acid from mineral source: water solubility ≥98%, humic acid content ≥50%, its core function is to adsorb soil Na +(Exchange capacity ≥200mmol / kg), adjust pH to neutral to promote root nutrient absorption; 2. Sodium polyacrylate: with a molecular weight of 8-12 million, water solubility ≤5min, its core function is to form a three-dimensional water-retaining network (water holding capacity of 500 times its own weight), inhibit salt surface accumulation, and improve soil aggregate structure. 3. Sugar alcohol chelated zinc: Zn 2+ With a content of ≥15%, in aqueous form, its core function is to supplement zinc nutrition, enhance the activity of anti-stress enzymes (SOD / POD), and alleviate oxidative damage under salt stress. 4. Indolebutyric acid (IBA): Aqueous solution with an active ingredient content of ≥5%. Its core function is to promote the elongation of plant radicles and the differentiation of lateral roots, improve root penetration, and enhance adaptability to saline-alkali soils. 5. Sodium polycarboxylate: Dispersant, industrial grade. Its core function is to prevent polymer agglomeration, reduce surface tension, and ensure stable dispersion of the anti-salt and alkali water replenishment preparation within the pH range of 6.8-7.2. 6. Sodium benzoate: a food-grade preservative whose core function is to inhibit microbial growth, extend shelf life (≥12 months), and ensure the long-term effectiveness of salt-alkali hydration agents; 7. Deionized water: conductivity ≤0.010 dS / m. Its core function is as a solvent, providing a medium for ion exchange and mass transport.

[0034] Example 1 Salt-alkali resistant water replenishment preparation to promote seed germination in saline-alkali soil By weight percentage, the raw materials of the anti-salt-alkali hydration preparation of this embodiment include: 8-15% mineral-derived potassium humate, 5-10% sodium polyacrylate, 0.5-2% sugar alcohol chelated zinc, 0.1-0.5% indolebutyric acid (IBA), 0.2-0.8% sodium polycarboxylate, 0.1-0.3% sodium benzoate, and the balance being deionized water.

[0035] Example 2 Preparation method of salt-alkali resistant and water-replenishing agent to promote seed germination in saline-alkali soil 1. Combination Figure 1 As shown, potassium humate, sodium polyacrylate, sugar alcohol chelated zinc, indolebutyric acid, sodium polycarboxylate, sodium benzoate and deionized water were weighed according to the weight percentage of Example 1.

[0036] 2. Pretreatment: Preheat the weighed deionized water to 40-50℃, and pass the weighed potassium humate from the mineral source through a 100-mesh sieve.

[0037] 3. Dissolving potassium humate from mineral source: Add the sieved potassium humate to preheated deionized water and stir at 200-300 rpm for 30 minutes until completely dissolved to form a transparent solution.

[0038] 4. Polymer swelling: slowly add weighed polyacrylic acid sodium to the transparent solution, heat to 50-60°C, and shear at high speed (8000 rpm) for 20 minutes to form a homogeneous colloid.

[0039] 5. Functional component compounding: cool to 28-32°C, add weighed sugar alcohol chelated zinc and indole butyric acid to the homogeneous colloid, maintain stirring at 100 rpm for 1 hour to ensure that the trace elements and plant growth regulators are fully dispersed, and obtain a mixed colloid.

[0040] 6. Stabilization treatment: add weighed polyacrylic acid sodium (dispersant) and sodium benzoate (preservative) to the mixed colloid, adjust the pH to 6.8-7.2 with 4 M potassium hydroxide solution, and detect the conductivity ≤1.5 dS / m to obtain a mixture.

[0041] 7. Homogenization and filtration: remove impurities from the mixture obtained in step 6 by three-stage filtration (100 mesh, 50 mesh, and 0.45 μm filter membrane), and perform sterile detection (total number of colonies ≤100 CFU / mL) before filling to obtain a saline-alkali-resistant water supplement for promoting seed germination in saline-alkali soil.

[0042] In the saline-alkali-resistant water supplement for promoting seed germination in saline-alkali soil prepared in this example, two stability guarantee measures are taken: (1) Colloid protection: polyacrylic acid sodium prevents polyacrylic acid sodium molecular chains from entangling through steric hindrance effect, and the Zeta potential is controlled at -30 mV to -35 mV to ensure uniform dispersion of nano-sized particles; (2) Preservative system: sodium benzoate and natural antibacterial ingredients (humic acid) in the saline-alkali-resistant water supplement synergistically inhibit the growth of Escherichia coli, mold, and other miscellaneous bacteria. The saline-alkali-resistant water supplement of this example is verified by 37°C accelerated test, and the degradation rate of the effective ingredient is ≤5% within 60 days.

[0043] Example 3 Saline-alkali-resistant water supplement 1 for promoting seed germination in saline-alkali soil The raw materials of the saline-alkali-resistant water supplement 1 of this example include, by weight percentage: 12% of potassium fulvic acid, 8% of polyacrylic acid sodium, 1.5% of sugar alcohol chelated zinc, 0.3% of indole butyric acid (IBA), 0.5% of polyacrylic acid sodium, 0.2% of sodium benzoate, and the balance is deionized water.

[0044] The saline-alkali-resistant water supplement 1 for promoting seed germination in saline-alkali soil is prepared according to the preparation method of Example 2.

[0045] Example 4 Application of saline-alkali-resistant water supplement 1 for promoting seed germination in saline-alkali soil to cotton planting in heavy saline-alkali soil in Shaya County, Xinjiang Two treatments were set, control group and the formulation of Example 3 as experimental group. Two saline-alkali soil were selected for experiment, and the soil EC was 6.54 dS / m and 11.27 dS / m respectively. The anti-saline-alkali water supplementing preparation 1 for promoting seed germination in saline-alkali soil of Example 3 was diluted 800 times, and then added dropwise into the soil with EC of 6.54 dS / m; the anti-saline-alkali water supplementing preparation 1 for promoting seed germination in saline-alkali soil was diluted 500 times, and then added dropwise into the soil with EC of 11.27 dS / m, 50 milliliters were added to each hole, and water was used as the control group. Cotton was sown, and the germination percentage was investigated after 10 days.

[0046] The results are shown in Figure 2 In moderate saline-alkali soil (EC = 6.54 dS / m), compared with the control group, the experimental group showed a 45% decrease in the Na + concentration around the root system, the K + / Na + ratio increased from 1.2 to 3.5, the seed water absorption rate increased by 20%, the germination rate of the experimental group reached 85.67%, while the germination rate of the control group was only 42.65%, which was 43% higher than that of the control group; in severe saline-alkali soil (EC = 11.27 dS / m), the sodium polyacrylate network locked water, so that the seeds could germinate under the osmotic potential of-1.5 MPa, and the average germination rate was 75.13%, while the seeds of the control group stopped germination due to cell dehydration, and the germination rate was only 28.62%.

[0047] Example 5 Anti-saline-alkali water supplementing preparation 2 for promoting seed germination in saline-alkali soil The raw materials of the anti-saline-alkali water supplementing preparation 2 of the present embodiment include, by weight percentage: 10% of potassium fulvic acid, 9% of sodium polyacrylate, 1% of sugar alcohol chelated zinc, 0.4% of indole butyric acid (IBA), 0.6% of sodium polycarboxylate, 0.15% of sodium benzoate, and the balance is deionized water.

[0048] The anti-saline-alkali water supplementing preparation 2 for promoting seed germination in saline-alkali soil was prepared according to the preparation method of Example 2.

[0049] Example 6 Application of anti-saline-alkali water supplementing preparation 2 for promoting seed germination in saline-alkali soil in wheat planting in Northeast Jilin soda saline-alkali soil Two treatments were set up, the control group and the formulation of Example 5 as the experimental group. Two saline-alkali soils were selected for the experiment. The soil EC was 4.18 dS / m and 10.54 dS / m, respectively. The salt-alkali soil seed germination promoting anti-saline water supplementing preparation 2 of Example 5 was diluted 1000 times, and then sprayed on the soil with EC of 4.18 dS / m at 1 liter per square meter; the salt-alkali soil seed germination promoting anti-saline water supplementing preparation 2 was diluted 700 times, and then sprayed on the soil with EC of 10.54 dS / m at 1 liter per square meter. The control group was water, and the wheat was sown. After 10 days, the germination percentage was investigated.

[0050] The results are shown in Table 1. Figure 3 As shown in Table 1, in the moderate saline-alkali soil (EC = 4.18 dS / m), the potassium fulvic acid of mineral origin adjusted the soil pH from 9.2 to 8.0, promoted the α-amylase activity by 30%, and improved the starch hydrolysis efficiency. Compared with the control group, the germination rate of the experimental group reached 88.52%, while that of the control group was only 35.68%, which was 53% higher than that of the control group. In the severe saline-alkali soil (EC = 10.54 dS / m), indole-3-butyric acid stimulated the cell division of radicle, and the time for radicle to break through the seed coat was shortened by 24 hours. The germination rate of the experimental group reached 76.24%, while the radicle growth of the control group was hindered, resulting in a low germination rate of only 22.41%.

[0051] Example 7 Salt-alkali soil seed germination promoting anti-saline water supplementing preparation 3 The raw materials of the anti-saline water supplementing preparation 3 of the present embodiment include, by weight percentage: 15% of potassium fulvic acid of mineral origin, 5% of sodium polyacrylate, 2% of sugar alcohol chelated zinc, 0.2% of indole-3-butyric acid (IBA), 0.8% of sodium polycarboxylate, 0.3% of sodium benzoate, and the balance of deionized water.

[0052] The salt-alkali soil seed germination promoting anti-saline water supplementing preparation 3 was prepared according to the preparation method of Example 2.

[0053] Example 8 Application of salt-alkali soil seed germination promoting anti-saline water supplementing preparation 3 in Jiangsu coastal saline-alkali soil rice seedling raising Two treatments were set up, the control group and the formulation of Example 7 as the experimental group. Two saline-alkali soils were selected for the experiment. The soil EC was 3.57 dS / m and 7.85 dS / m, respectively. The salt-alkali soil seed germination promoting anti-saline water supplementing preparation 3 was diluted 1200 times, and then soaked and sprayed on the soil with EC of 3.57 dS / m at 1 liter per square meter; the salt-alkali soil seed germination promoting anti-saline water supplementing preparation 3 was diluted 600 times, and then soaked and sprayed on the soil with EC of 7.85 dS / m at 1 liter per square meter; the control group was water. The rice was sown, and after 10 days, the germination percentage was investigated.

[0054] The results are as follows Figure 4 As shown, in moderately saline-alkali soil (EC=3.57 dS / m), after adding the formulation of Example 7, the sugar alcohol chelated zinc enhanced the integrity of the root plasma membrane, reduced the MDA (membrane lipid peroxidation product) content by 40%, increased the seed vigor index by 55%, and achieved a germination rate of 85.34%, compared to only 48.52% in the control group. In severely saline-alkali soil (EC=7.85 dS / m), the sodium polyacrylate water-retaining network in Example 7 maintained the moisture content around the seeds at 18-22%, achieving a germination rate of 78.28%, while the control group, due to rapid water evaporation leading to seed dehydration, had a germination rate of only 25.39%.

[0055] All other parts not described in detail are existing technologies. Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A salt-alkali resistant and water-replenishing agent that promotes seed germination in saline-alkali soil, characterized in that: The raw materials of the anti-salt and alkali hydration preparation, by weight percentage, include: 8-15% potassium humate from mineral sources, 5-10% sodium polyacrylate, 0.5-2% sugar alcohol chelated zinc, 0.1-0.5% indolebutyric acid, 0.2-0.8% sodium polycarboxylate, 0.1-0.3% sodium benzoate, and the balance being water.

2. The anti-salt-alkali hydration preparation according to claim 1, characterized in that: The raw materials of the anti-salt and alkali hydration preparation, by weight percentage, include: 10-15% potassium humate from mineral source, 5-9% sodium polyacrylate, 1-2% sugar alcohol chelated zinc, 0.2-0.4% indolebutyric acid, 0.5-0.8% sodium polycarboxylate, 0.15-0.3% sodium benzoate, and the balance being water.

3. The anti-salt-alkali hydration preparation according to claim 2, characterized in that: The raw materials of the anti-salt-alkali hydration preparation, by weight percentage, include: 10% potassium humate, 9% sodium polyacrylate, 1% sugar alcohol chelated zinc, 0.4% indolebutyric acid, 0.6% sodium polycarboxylate, 0.15% sodium benzoate, and the balance being water.

4. The anti-salt-alkali hydration preparation according to claim 3, characterized in that: The potassium fulvic acid from the mineral source contains ≥50% humic acid. The molecular weight of the sodium polyacrylate is 8-12 million. In the sugar alcohol chelated zinc, Zn 2+ Content ≥15%; The indolebutyric acid contains ≥5% active ingredient; The electrical conductivity of the water is ≤0.010 dS / m.

5. A method for preparing the anti-salt-alkali hydration agent according to claim 1, characterized in that: Includes the following steps: (1) Weigh out the following mineral-derived potassium humate, sodium polyacrylate, sugar alcohol chelated zinc, indolebutyric acid, sodium polycarboxylate, sodium benzoate and water according to the above weight percentages; (2) Preheat the weighed deionized water to 40-50℃ and sieve the weighed potassium humate from mineral source. (3) Add the sieved potassium humate from the mineral source to preheated deionized water and stir to form a transparent solution; (4) Add the weighed sodium polyacrylate to the transparent solution, heat it to 50-60℃ and then shear it at high speed until a homogeneous colloid is formed; (5) Cool down to 28-32℃, add the weighed sugar alcohol chelated zinc and indolebutyric acid to the homogeneous colloid in sequence, and stir to obtain a mixed colloid; (6) Add the weighed sodium polycarboxylate and sodium benzoate to the mixed colloid, adjust the pH to 6.8-7.2, and obtain the mixed substance; (7) The mixture is filtered through three stages to obtain an anti-salt and alkali water replenishment agent that promotes the germination of seeds in saline-alkali land.

6. The preparation method according to claim 5, characterized in that: In step (3), the stirring speed is 200-300 rpm and the stirring time is 25-35 minutes; In step (4), the high-speed shearing speed is 5000-8000 rpm and the high-speed shearing time is 20-25 minutes; In step (5), the stirring speed is 100-120 rpm and the stirring time is 1-1.5 hours.

7. The preparation method according to claim 5, characterized in that: In step (6), the solution used to adjust the pH is a 4 M potassium hydroxide solution; In step (7), the three-stage filtration specifically involves filtering through 100-mesh, 50-mesh, and 0.45μm filter membranes, respectively.

8. The preparation method according to claim 5, characterized in that: The saline-alkali resistant water replenishment agent that promotes seed germination in saline-alkali land has an electrical conductivity ≤1.5dS / m, a total bacterial count ≤100CFU / mL, and a Zeta potential of -30mV to -35mV.

9. The application of the salt-alkali resistant water-replenishing agent according to claim 1 in promoting seed germination of crops in saline-alkali land, characterized in that: The crop is any one of cotton, wheat, and rice.

10. The application according to claim 9, characterized in that: The EC value of the saline-alkali land is 3-12 dS / m.

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