A compound liquid fertilizer containing amino acids

Abstract

The present application relates to the technical field of fertilizer, in particular to a kind of complex liquid fertilizer containing amino acid.A kind of complex liquid fertilizer containing amino acid, comprising: preparation of composite dispersant, preparation of amino acid chelate, preparation of complex liquid fertilizer.The present application is prepared with sulfomethylated lignin and polyether amine bridging condensation composite dispersant, prevents liquid fertilizer stratification settlement by " electrostatic repulsion + steric hindrance ";Lanthanum is synthesized with L-lysine, glycine ternary chelate in ethanol, provides multi-element nutrition and prevents precipitation, realizes long-acting release of rare earth;It is also with plant source hydrolyzed amino acid, seaweed extract, polyglutamic acid compound fertilizer, the three synergistically improve photosynthetic efficiency, accelerate product transport, finally make crop growth vigor, high yield, good quality.

Description

Technical Field

[0001] This invention relates to the field of fertilizer technology, specifically to a compound liquid fertilizer containing amino acids. Background Technology

[0002] As modern agriculture develops towards higher efficiency, precision, and green practices, the problems of traditional solid fertilizers, such as slow dissolution, low absorption and utilization rates, and inconvenient application, are becoming increasingly prominent. Liquid fertilizers, with their advantages of uniform nutrient distribution, rapid crop absorption, applicability via flushing or drip irrigation, and reduced nutrient loss, have become an important development direction for the fertilizer industry. Among them, amino acid-based liquid fertilizers are increasingly widely used in the cultivation of fruits, vegetables, and cash crops because amino acids can be directly absorbed and utilized by crops, promoting chlorophyll synthesis, enhancing crop resistance, and improving the quality of agricultural products.

[0003] However, existing amino acid compound liquid fertilizers still face many technical bottlenecks in their production and application, making it difficult to meet the high requirements of modern agriculture for fertilizer stability, nutrient availability, and comprehensive quality improvement. Specific problems are as follows:

[0004] Amino acid compound liquid fertilizers typically require the addition of functional ingredients such as amino acid chelates and potassium humate, which are mostly dispersed in the system as tiny particles. Existing products often use single-type surfactants as dispersants, which can only provide limited electrostatic repulsion through simple adsorption and cannot effectively resist van der Waals forces between particles. During storage, particles are prone to agglomeration and sedimentation, leading to fertilizer stratification. This not only affects the appearance and application uniformity but also reduces the utilization rate of active ingredients, shortens the product's shelf life, and causes inconvenience for production, transportation, and farmers.

[0005] To enhance the nutritional value of fertilizers, some products add amino acid chelates. However, existing chelates mostly use single amino acids chelated with metal ions, resulting in a relatively singular nutrient supply that cannot comprehensively meet the crop's needs for multiple amino acids and elements. Furthermore, the coordination structure of single amino acid chelates is relatively unstable. When coexisting with components in fertilizers such as potassium dihydrogen phosphate and potassium humate, they are prone to dissociation and precipitation, compromising the stability of the fertilizer system. In addition, if rare earth elements are added to regulate crop physiological functions, these elements are easily adsorbed and fixed by soil colloids, transforming into forms that crops cannot absorb, leading to low rare earth utilization and failing to fully realize their role in regulating crop growth.

[0006] Most existing amino acid compound liquid fertilizers use amino acids as the core nutrient component, and generally suffer from insufficient organic carbon sources.

[0007] Therefore, this application aims to develop a novel amino acid compound liquid fertilizer that balances stability, nutritional comprehensiveness, and quality and yield improvement effects to meet the needs of modern agricultural development. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a compound liquid fertilizer containing amino acids.

[0009] This invention provides a compound liquid fertilizer containing amino acids, comprising:

[0010] 70-75 parts by weight of amino acid compound synergist, 8-12 parts by weight of urea, 10-15 parts by weight of potassium dihydrogen phosphate, 2-3 parts by weight of amino acid chelate, 5-8 parts by weight of trace elements, 5-8 parts by weight of potassium humate, 1-2 parts by weight of stabilizer, and 5-8 parts by weight of compound dispersant.

[0011] The amino acid compound synergist is composed of plant-derived hydrolyzed amino acids, seaweed extract and polyglutamic acid in a weight ratio of 60-70:10:3.

[0012] Its preparation process specifically includes the following steps:

[0013] S1: Preparation of composite dispersant;

[0014] A composite dispersant was prepared by adding polyetheramine to a heated aqueous solution of sulfonated lignin, followed by the dropwise addition of an aqueous solution of formaldehyde, and stirring and mixing.

[0015] S2: Preparation of amino acid chelates;

[0016] First, L-lysine was chelated and reacted with lanthanum chloride to obtain a reactant, which was then reacted with glycine to prepare an amino acid chelate.

[0017] S3: Preparation of compound liquid fertilizer;

[0018] First, amino acid compound synergist, urea, and potassium dihydrogen phosphate are added to deionized water. Then, amino acid chelate and trace elements are added. After mixing, potassium humate, stabilizer, and compound dispersant are added to prepare compound liquid fertilizer.

[0019] This invention also specifies the weight ratio of plant-derived hydrolyzed amino acids, seaweed extract, and polyglutamic acid in the amino acid compound synergist, stipulating that the ratio is 60-70:10:3. The core advantage of this ratio is functional complementarity and appropriate concentration, avoiding functional redundancy or inhibitory effects caused by an excessively high proportion of any one component. If the amino acid proportion exceeds 70 parts by weight, it will lead to excessive nitrogen content in the fertilizer, easily causing excessive vegetative growth, weak stems, poor lodging resistance, and disrupting the nutrient balance, resulting in relatively insufficient absorption of phosphorus and potassium by the crop. The 60-70 part by weight ratio just meets the needs of "nutrient supply" and "growth balance," and the lower proportion of amino acids also... This can lead to insufficient nitrogen content in the fertilizer, affecting growth. If the seaweed extract is less than 10 parts by weight, the concentration of active substances in it cannot effectively activate the plant's defense system. If it is much higher than 10 parts by weight, it will not only increase costs, but its high concentration of active ingredients will also bring unpredictable physiological regulation risks. 3 parts by weight of polyglutamic acid can fully exert its water retention, fertilizer retention and slow release effects in this system. Further increasing the dosage will not significantly improve the effect, but will bring adverse effects such as increased viscosity and increased costs. The ratio of 3 parts by weight just reaches the "efficacy threshold", balancing effectiveness and ease of use. The ratio of 60-70:10:3 can maximize the comprehensive effect of compound liquid fertilizer.

[0020] As a preferred aspect, S1: the preparation of the composite dispersant specifically includes the following steps:

[0021] S1.1: Add sulfonated lignin to 100 parts by weight of deionized water to prepare a 25-30 wt% sulfonated lignin aqueous solution;

[0022] S1.2: Heat the sulfonated lignin aqueous solution to 90-95℃, then add 10-12 parts by weight of polyetheramine, stir and mix at 200-300 r / min for 20-30 min, then add 20-23 parts by weight of formaldehyde aqueous solution dropwise using a peristaltic pump for 30-40 min, and react for 90-100 min after the addition is complete. After the reaction is complete, cool to room temperature to obtain the composite dispersant.

[0023] As a preferred aspect, the sulfonic acid group content of the sulfonated lignin in step S1.1 is 0.68-1.18 mmol / g.

[0024] As a preferred aspect, the concentration of the formaldehyde aqueous solution in step S1.2 is 10-12 wt%.

[0025] As a preferred aspect, S2: the preparation of amino acid chelates specifically includes the following steps:

[0026] S2.1: Add 1.02-1.05 parts by weight of lanthanum chloride and 1-2 parts by weight of L-lysine to 15-20 parts by weight of 95wt% ethanol solution, stir and mix at 200-230 r / min for 20-30 min, and then reflux at 60-65℃ for 3-4 h. After the reaction is complete, the reactant is obtained.

[0027] S2.2: After cooling the reactants, add 10-12 parts by weight of anhydrous ethanol and stir at 200-230 r / min for 20-30 min. Then add 5-6 parts by weight of glycine aqueous solution over 10-12 min. React at room temperature for 40-50 min. After the reaction is complete, filter under reduced pressure and wash 2-3 times with 95 wt% ethanol. After air drying, grind and pulverize to obtain amino acid chelates.

[0028] As a preferred aspect, the glycine aqueous solution in step S2.2 is specifically prepared by adding 2-3 parts by weight of glycine to 10-12 parts by weight of deionized water and mixing for 20-30 minutes.

[0029] As a preferred aspect, S3: the preparation of the compound liquid fertilizer specifically includes the following steps:

[0030] S3.1: Add 70-75 parts by weight of amino acid compound synergist, 8-12 parts by weight of urea, and 10-15 parts by weight of potassium dihydrogen phosphate to 100-120 parts by weight of deionized water in sequence, and stir at 40-45℃ until completely dissolved to obtain the base solution.

[0031] S3.2: Add 2-3 parts by weight of amino acid chelate and 5-8 parts by weight of trace elements to the base solution, adjust the pH to 6.0-6.5, stir for 30-40 minutes to obtain the nutrient solution;

[0032] S3.3: Add 5-8 parts by weight of potassium humate to the nutrient solution, ultrasonically disperse at 50-55℃ and 300-350W for 20-25 minutes, cool to room temperature, add 1-2 parts by weight of stabilizer and 5-8 parts by weight of compound dispersant, stir for 15-20 minutes, filter, and obtain compound liquid fertilizer.

[0033] As a preferred aspect, the trace elements in step S3.2 are specifically a mixture of fulvic acid chelated zinc, fulvic acid chelated iron, fulvic acid chelated manganese, fulvic acid chelated calcium, and fulvic acid chelated boron in a mass ratio of 1:1:1:1:1.

[0034] As a preferred aspect, the stabilizer in step S3.3 is specifically polyethylene glycol 400.

[0035] The present invention has the following advantages:

[0036] 1. This invention uses sulfonated lignin as a raw material and modifies it with polyetheramine through bridging condensation to prepare a composite dispersant. This dispersant is added to a composite liquid fertilizer. The composite dispersant contains a large number of negatively charged hydrophilic groups, which can adsorb onto the surface of amino acid chelates and potassium humate microparticles, giving the particle surface a uniform negative charge. Through the "mutual repulsion of like charges," particle aggregation due to van der Waals forces is prevented. Furthermore, the long-chain polyether structure of the polyetheramine extends in water to form a "three-dimensional barrier," wrapping around the charged particles and further preventing them from approaching each other. Through the dual mechanism of "electrostatic repulsion + steric hindrance," a strong dispersion and stability effect is achieved, fundamentally solving the problems of "layering, sedimentation, and clumping" during liquid fertilizer storage and extending the fertilizer's shelf life.

[0037] 2. This invention synthesizes amino acid chelates by reacting lanthanum with L-lysine and glycine in an ethanol solution. The amino acid chelate, with "lanthanum + L-lysine + glycine" as its core, can more comprehensively meet the nutritional needs of plants compared to single amino acid chelates, and its nutrient release is more stable. L-lysine is an essential basic amino acid that plants cannot synthesize themselves. When added directly to fertilizer through the complex, it can be directly absorbed and utilized by plants as an organic nitrogen source, reducing transformation losses in the soil. Glycine, as one of the amino acid raw materials involved in chlorophyll synthesis, can... It synergistically enhances leaf chlorophyll content and improves photosynthesis. Together with lanthanum, it forms a multi-nutrient combination of "amino acids + rare earth elements," covering the triple needs of "organic nitrogen supply + photosynthetic promotion + rare earth regulation." Lanthanum forms a bidentate ternary chelate ring with the two amino acids. When added to liquid fertilizer, it coexists with components such as potassium dihydrogen phosphate and potassium humate, which can significantly delay precipitation. After being applied to the soil, it can resist the adsorption and fixation of soil colloids, preventing lanthanum from being converted into a form that plants cannot absorb, thus achieving long-term slow release of rare earth elements and extending the nutrient supply cycle.

[0038] 3. This invention uses a compound liquid fertilizer prepared by combining plant-derived hydrolyzed amino acids, seaweed extract, and polyglutamic acid as an amino acid synergist. The plant-derived hydrolyzed amino acids, seaweed extract, and polyglutamic acid are combined in a golden ratio of 60-70:10:3, forming the core synergistic system of this invention. Amino acids are the main component, ensuring sufficient nitrogen source and chlorophyll synthesis precursors as the material basis for enhancing photosynthesis. Seaweed extract acts as a balancing and activating factor; at this ratio, seaweed polysaccharides can precisely regulate the C / N ratio, effectively compensating for carbon deficiency that may result from high amino acid content and preventing microorganisms from competing for nitrogen. Simultaneously, its stress-resistant components synergistically activate the crop's stress-resistant immune response. Polyglutamic acid is the key to efficiency enhancement; this amount is sufficient to form a highly efficient water-retaining barrier in the rhizosphere and significantly enhance the activity of sucrose transport proteins. Although its proportion is small, it is a catalyst for completing the key step of "photosynthetic product transport", avoiding the retention of photosynthetic products in the leaves and ensuring that energy is directed to the fruit. The above proportions of the three can maximize the synergistic effect, improve the overall effect of compound liquid fertilizer, and successfully build a virtuous cycle of enhanced photosynthetic efficiency → accelerated product transport → improved stress resistance, ultimately achieving high efficiency, stability and sustainability of crop yield and quality improvement. Attached Figure Description

[0039] Figure 1 This is a process flow diagram of the preparation process of a compound liquid fertilizer containing amino acids according to an embodiment of the present invention.

[0040] Figure 2 The graph shows the stability test results of the compound liquid fertilizers in Examples 1-3 and Comparative Examples 1-3 of this invention. Detailed Implementation

[0041] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this invention.

[0042] Example 1: A method for preparing a compound liquid fertilizer containing amino acids, referring to... Figure 1 ,include:

[0043] S1: Preparation of composite dispersants

[0044] S1.1: Add sulfonated lignin to 100 parts by weight of deionized water to prepare a 25 wt% aqueous solution of sulfonated lignin, the sulfonic acid group content of the sulfonated lignin is 0.68 mmol / g;

[0045] S1.2: The sulfonated lignin aqueous solution was heated to 90℃, and then 10 parts by weight of polyetheramine were added. The mixture was stirred at 200 r / min for 20 min. Then, 20 parts by weight of 10 wt% formaldehyde aqueous solution was added dropwise using a peristaltic pump for 30 min. After the addition was completed, the reaction was carried out for 90 min. After the reaction was completed, the mixture was cooled to room temperature to obtain the composite dispersant.

[0046] S2: Preparation of amino acid chelates

[0047] S2.1: 1.02 parts by weight of lanthanum chloride and 1 part by weight of L-lysine were added to 15 parts by weight of 95 wt% ethanol solution, stirred and mixed at 200 r / min for 20 min, and then refluxed at 60 °C for 3 h. After the reaction was completed, the reactant was obtained.

[0048] S2.2: After cooling the reactants, add 10 parts by weight of anhydrous ethanol and stir at 200 r / min for 20 min. Then add 5 parts by weight of glycine aqueous solution over 10 min. After that, react at room temperature for 40 min. After the reaction is complete, filter under reduced pressure and wash twice with 95 wt% ethanol. After air drying, grind and pulverize to obtain amino acid chelates.

[0049] Specifically, the glycine aqueous solution is prepared by adding 2 parts by weight of glycine to 10 parts by weight of deionized water and mixing for 20 minutes.

[0050] S3: Preparation of Compound Liquid Fertilizer

[0051] S3.1: Add 70 parts by weight of amino acid compound synergist, 8 parts by weight of urea, and 10 parts by weight of potassium dihydrogen phosphate to 100 parts by weight of deionized water in sequence, and stir at 40°C until completely dissolved to obtain the base solution.

[0052] S3.2: Add 2 parts by weight of amino acid chelate and 5 parts by weight of trace elements to the base solution, adjust the pH to 6.0, stir for 30 min to obtain nutrient solution;

[0053] S3.3: Add 5 parts by weight of potassium humate to the nutrient solution, ultrasonically disperse at 50℃ and 300W for 20 minutes, cool to room temperature, add 1 part by weight of polyethylene glycol 400 and 5 parts by weight of composite dispersant, stir for 15 minutes, filter to obtain composite liquid fertilizer, wherein the amino acid composite synergist is composed of plant-derived hydrolyzed amino acids, seaweed extract and polyglutamic acid in a weight ratio of 60:10:3.

[0054] Example 2, a method for preparing a compound liquid fertilizer containing amino acids, see [link to example]. Figure 1 ,include:

[0055] S1: Preparation of composite dispersants

[0056] S1.1: Add sulfonated lignin to 100 parts by weight of deionized water to prepare a 30 wt% aqueous solution of sulfonated lignin, the sulfonic acid group content of which is 1.18 mmol / g;

[0057] S1.2: The sulfonated lignin aqueous solution was heated to 90°C, and then 12 parts by weight of polyetheramine were added. The mixture was stirred at 200 r / min for 20 min. Then, 23 parts by weight of 12 wt% formaldehyde aqueous solution were added dropwise using a peristaltic pump for 30 min. After the addition was completed, the reaction was carried out for 90 min. After the reaction was completed, the mixture was cooled to room temperature to obtain the composite dispersant.

[0058] S2: Preparation of amino acid chelates

[0059] S2.1: 1.05 parts by weight of lanthanum chloride and 2 parts by weight of L-lysine were added to 20 parts by weight of 95 wt% ethanol solution, stirred and mixed at 200 r / min for 20 min, and then refluxed at 60 °C for 3 h. After the reaction was completed, the reactant was obtained.

[0060] S2.2: After cooling the reactants, add 12 parts by weight of anhydrous ethanol and stir at 200 r / min for 20 min. Then add 6 parts by weight of glycine aqueous solution dropwise over 10 min. After that, react at room temperature for 40 min. After the reaction is complete, filter under reduced pressure and wash twice with 95 wt% ethanol. After air drying, grind and pulverize to obtain amino acid chelates.

[0061] Specifically, the glycine aqueous solution is prepared by adding 3 parts by weight of glycine to 12 parts by weight of deionized water and mixing for 20 minutes.

[0062] S3: Preparation of Compound Liquid Fertilizer

[0063] S3.1: Add 75 parts by weight of amino acid compound synergist, 12 parts by weight of urea and 15 parts by weight of potassium dihydrogen phosphate to 120 parts by weight of deionized water in sequence, and stir at 40°C until completely dissolved to obtain the base solution.

[0064] S3.2: Add 3 parts by weight of amino acid chelate and 8 parts by weight of trace elements to the base solution, adjust the pH to 6.5, stir for 30 minutes to obtain the nutrient solution;

[0065] S3.3: Add 8 parts by weight of potassium humate to the nutrient solution, ultrasonically disperse at 50℃ and 300W for 20 minutes, cool to room temperature, add 2 parts by weight of polyethylene glycol 400 and 8 parts by weight of composite dispersant, stir for 15 minutes, filter to obtain composite liquid fertilizer, wherein the amino acid composite synergist is composed of plant-derived hydrolyzed amino acids, seaweed extract and polyglutamic acid in a weight ratio of 70:10:3.

[0066] Example 3, a method for preparing a compound liquid fertilizer containing amino acids, see [link to example]. Figure 1 ,include:

[0067] S1: Preparation of composite dispersants

[0068] S1.1: Add sulfonated lignin to 100 parts by weight of deionized water to prepare a 25 wt% aqueous solution of sulfonated lignin, the sulfonic acid group content of the sulfonated lignin is 0.68 mmol / g;

[0069] S1.2: The sulfonated lignin aqueous solution was heated to 95°C, and then 10 parts by weight of polyetheramine were added. The mixture was stirred at 300 r / min for 30 min. Then, 20 parts by weight of 10 wt% formaldehyde aqueous solution was added dropwise using a peristaltic pump for 40 min. After the addition was completed, the reaction was allowed to proceed for 100 min. After the reaction was completed, the mixture was cooled to room temperature to obtain the composite dispersant.

[0070] S2: Preparation of amino acid chelates

[0071] S2.1: 1.02 parts by weight of lanthanum chloride and 1 part by weight of L-lysine were added to 15 parts by weight of 95 wt% ethanol solution, stirred and mixed at 230 r / min for 30 min, and then refluxed at 65 °C for 4 h. After the reaction was completed, the reactant was obtained.

[0072] S2.2: After cooling the reactants, add 10 parts by weight of anhydrous ethanol and stir at 230 r / min for 30 min. Then add 5 parts by weight of glycine aqueous solution over 12 min. After that, react at room temperature for 50 min. After the reaction is complete, filter under reduced pressure and wash three times with 95 wt% ethanol. After air drying, grind and pulverize to obtain amino acid chelates.

[0073] Specifically, the glycine aqueous solution is prepared by adding 2 parts by weight of glycine to 10 parts by weight of deionized water and mixing for 30 minutes.

[0074] S3: Preparation of Compound Liquid Fertilizer

[0075] S3.1: Add 70 parts by weight of amino acid compound synergist, 8 parts by weight of urea, and 10 parts by weight of potassium dihydrogen phosphate to 100 parts by weight of deionized water in sequence, and stir at 45°C until completely dissolved to obtain the base solution.

[0076] S3.2: Add 2 parts by weight of amino acid chelate and 5 parts by weight of trace elements to the base solution, adjust the pH to 6.0, stir for 40 min to obtain nutrient solution;

[0077] S3.3: Add 5 parts by weight of potassium humate to the nutrient solution, ultrasonically disperse at 55℃ and 350W for 25 minutes, cool to room temperature, add 1 part by weight of polyethylene glycol 400 and 5 parts by weight of composite dispersant, stir for 20 minutes, filter to obtain composite liquid fertilizer, wherein the amino acid composite synergist is composed of plant-derived hydrolyzed amino acids, seaweed extract and polyglutamic acid in a weight ratio of 65:10:3.

[0078] Comparative Example 1 differs from Example 1 in that the composite dispersant in steps S1 and S3.3 is removed, while the remaining steps remain unchanged to prepare the composite liquid fertilizer. This is referred to as Comparative Example 1.

[0079] Comparative Example 2 differs from Example 1 in that step S2.2 is removed, the reactants in step S2.1 are filtered, washed, and dried to obtain L-lysine chelate, the amino acid chelate in step S3.2 is replaced with the L-lysine chelate obtained in step S2.1, and the remaining steps are unchanged to prepare a compound liquid fertilizer, which is referred to as Comparative Example 2.

[0080] Comparative Example 3 differs from Example 1 in that step S2.2 is removed, and L-lysine in step S2.1 is replaced with glycine. The remaining steps are unchanged to prepare the reactant. The reactant is filtered, washed, and dried to obtain glycine chelate. The amino acid chelate in step S3.2 is replaced with the glycine chelate obtained in step S2.1. The remaining steps are unchanged to prepare the compound liquid fertilizer, which is referred to as Comparative Example 3.

[0081] Comparative Example 4 differs from Example 1 in that the weight ratio of plant-derived hydrolyzed amino acids, seaweed extract, and polyglutamic acid in Comparative Example 4 is 55:10:3, while the other steps remain unchanged in preparing the compound liquid fertilizer. This is referred to as Comparative Example 4.

[0082] Comparative Example 5 differs from Example 1 in that the weight ratio of plant-derived hydrolyzed amino acids, seaweed extract, and polyglutamic acid in Comparative Example 5 is 75:10:3, while the other steps remain unchanged in preparing the compound liquid fertilizer. This is referred to as Comparative Example 5.

[0083] Take 100 mL of the compound liquid fertilizer prepared in Examples 1-3 and Comparative Examples 1-3 respectively, place them in Erlenmeyer flasks, and observe the appearance of the liquid fertilizer after placing them at room temperature for 180 days. The test results are shown in Table 1. Figure 2 .

[0084] Table 1. Results of stability testing of compound liquid fertilizers from Examples 1-3 and Comparative Examples 1-3

[0085]

[0086] From Table 1 and Figure 2 The data shows that the composite dispersant prepared by this invention can avoid the problems of "layering, sedimentation and clumping" during the storage of liquid fertilizer, extend the shelf life of fertilizer, and the ternary chelate ring formed by lanthanum and two amino acids has better stability than single amino acid chelates. After being added to liquid fertilizer, it can significantly reduce precipitation reaction and significantly reduce the occurrence of layering.

[0087] The fertilization effects of the compound liquid fertilizers prepared in Examples 1-3 and Comparative Examples 2-5 were measured, and the results are shown in Table 2.

[0088] A control group was set up using compound fertilizer with the following composition: 15% nitrogen, 15% phosphorus, and 15% potassium. The compound liquid fertilizer prepared in Examples 1-3 and Comparative Examples 2-5, along with the control group's compound fertilizer, were diluted with water at a ratio of 1:200 and applied to the roots of conventionally planted bok choy using standard methods. After the bok choy matured, five bok choy plants were randomly selected from each group, their weight was measured, and the average value was taken. The planting area of ​​bok choy in each group was the same, and the total yield of bok choy was also measured.

[0089] Table 2. Experimental results of fertilization effects in Examples 1-3, Comparative Examples 2-5, and the control group.

[0090]

[0091] Table 2 and the data from Comparative Examples 2-3 show that the synthesis of amino acid chelates by reacting lanthanum with L-lysine and glycine in an ethanol solution can more comprehensively meet the nutritional needs of plants compared to single amino acid chelates, thereby effectively increasing plant yield. The data from Comparative Examples 4-5 show that a ratio of 60-70:10:3 maximizes the growth-promoting effect of the compound liquid fertilizer, effectively increasing plant yield. The data from the control group indicate that the compound liquid fertilizer prepared in this invention can achieve superior crop growth and high yield.

[0092] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Parts not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. A complex liquid fertilizer containing amino acids, characterized in that, Comprise: 70-75 parts by weight of amino acid complex synergist, 8-12 parts by weight of urea, 10-15 parts by weight of potassium dihydrogen phosphate, 2-3 parts by weight of amino acid chelate, 5-8 parts by weight of trace elements, 5-8 parts by weight of potassium humate, 1-2 parts by weight of stabilizer, 5-8 parts by weight of composite dispersant; Wherein the amino acid complex synergist is composed of plant source hydrolyzed amino acid, seaweed extract and polyglutamic acid in a weight ratio of 60-70:10:3; Its preparation process, specifically includes the following steps: S1: preparation of composite dispersant; S1.1: add sulfomethylated lignin to 100 parts by weight of deionized water to prepare 25-30wt% sulfomethylated lignin aqueous solution; S1.2: the sulfomethylated lignin aqueous solution is heated to 90-95℃, then 10-12 parts by weight of polyether amine is added, stirred and mixed at 200-300r / min for 20-30min, then 20-23 parts by weight of formaldehyde aqueous solution is added dropwise by peristaltic pump, dropwise for 30-40min, after dropwise addition is completed, reaction for 90-100min, after reaction is completed, cool to room temperature to obtain the composite dispersant; S2: preparation of amino acid chelate; S2.1: add 1.02-1.05 parts by weight of lanthanum chloride, 1-2 parts by weight of L-lysine to 15-20 parts by weight of 95wt% ethanol solution, stir and mix at 200-230r / min for 20-30min, then carry out condensation reflux reaction at 60-65℃ for 3-4h, after reaction is completed, obtain the reaction product; S2.2: after the reaction product is cooled, 10-12 parts by weight of anhydrous ethanol is added, stirred and mixed at 200-230r / min for 20-30min, then 5-6 parts by weight of glycine aqueous solution is added dropwise, dropwise time is 10-12min, then react at room temperature for 40-50min, after reaction is completed, reduce pressure and filter, then wash with 95wt% ethanol for 2-3 times, air dry and dry, then grind to obtain the amino acid chelate; The glycine aqueous solution is prepared by adding 2-3 parts by weight of glycine to 10-12 parts by weight of deionized water, mixing for 20-30min; S3: preparation of composite liquid fertilizer; First, add amino acid complex synergist, urea, potassium dihydrogen phosphate to deionized water, then add amino acid chelate and trace elements, mix, then add potassium humate, stabilizer and composite dispersant to prepare the composite liquid fertilizer.

2. The complex liquid fertilizer containing amino acids according to claim 1, characterized by, The sulfonic acid group content of sulfomethylated lignin in step S1.1 is 0.68-1.18mmol / g.

3. The complex liquid fertilizer containing amino acids according to claim 1, characterized by, The concentration of formaldehyde aqueous solution in step S1.2 is 10-12wt%.

4. The complex liquid fertilizer containing amino acids according to claim 1, characterized by, S3: preparation of composite liquid fertilizer, specifically including the following steps: S3.1: add 70-75 parts by weight of amino acid complex synergist, 8-12 parts by weight of urea, 10-15 parts by weight of potassium dihydrogen phosphate to 100-120 parts by weight of deionized water, stir to completely dissolve at 40-45℃ to obtain the base liquid; S3.2: 2-3 parts by weight of amino acid chelate and 5-8 parts by weight of trace elements are added into the base solution, the pH is adjusted to 6.0-6.5, and stirring is performed for 30-40 min to obtain a nutrient solution; S3.3: 5-8 parts by weight of potassium humate is added into the nutrient solution, ultrasonic dispersion is performed at 50-55°C and 300-350W for 20-25 min, after being cooled to room temperature, 1-2 parts by weight of stabilizer and 5-8 parts by weight of composite dispersant are added, stirring is performed for 15-20 min, and filtration is performed to obtain a composite liquid fertilizer.

5. The complex liquid fertilizer containing amino acids according to claim 4, characterized by that, The trace elements in step S3.2 are specifically yellow humic acid chelated zinc, yellow humic acid chelated iron, yellow humic acid chelated manganese, yellow humic acid chelated calcium and yellow humic acid chelated boron, which are mixed in a mass ratio of 1:1:1:1:

1.

6. The complex liquid fertilizer containing amino acids according to claim 4, characterized by that, The stabilizer in step S3.3 is specifically polyethylene glycol 400.

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