Leaf fertilizer for improving toughness of expanded leaves and long leaves of economic forest crops as well as preparation method and application method of leaf fertilizer

Abstract

The invention discloses a foliar fertilizer for improving the toughness of expanded leaves and long leaves of economic forest crops and a preparation method and an application method of the foliar fertilizer, and relates to the technical field of foliar fertilizers, the foliar fertilizer for improving the toughness of expanded leaves and long leaves of economic forest crops comprises the following components: a nitrogen-phosphorus-potassium compound according to a weight ratio of 15-5-20; the weight concentration of the boron-sugar alcohol compound is 0.05 percent to 0.1 percent; the weight concentration of the zinc-amino acid compound is 0.02 percent to 0.08 percent; the weight concentration of the chitosan nano particles is 0.01 percent to 0.05 percent; the weight concentration of the humic acid compound is 0.1 to 0.2 percent; the invention also provides a preparation method and an application method of the foliar fertilizer for improving the toughness of leaf expansion and leaf growth of economic forest crops. According to the foliar fertilizer disclosed by the invention, through scientific combination of nutritional ingredients, the broadening degree, length and toughness of economic forest crop leaves are remarkably improved, the photosynthesis efficiency is enhanced, the leaves are not easy to damage, and the overall yield and quality of crops are improved.

Description

Technical Field

[0001] The invention relates to the field of foliar fertilizer technology, in particular to a foliar fertilizer used for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops, and a preparation method and an application method thereof. Background Art

[0002] The leaf growth of economic forest crops (such as tea oil trees, walnut trees, litsea cubeba, and bamboo) has a significant impact on their photosynthesis efficiency, yield, and quality. The area, length, and toughness of leaves are important indicators of leaf function, which are directly related to the growth rate and yield potential of plants. However, in the actual planting process, the leaves of economic forest crops are often restricted in growth due to environmental stress (such as drought, nutrient deficiency, or pests and diseases), resulting in poor leaf development, reduced toughness, and weakened resistance, which not only affects the healthy growth of plants, but also limits the improvement of yield and quality.

[0003] The common foliar fertilizers on the market currently focus on providing a single function, such as promoting rapid leaf growth or increasing yield, but they are insufficient in terms of the comprehensive effects of improving leaf expansion, leaf length and leaf toughness. The existing foliar fertilizers mainly have the following technical problems:

[0004] Single function: Most academic and commercial products are designed for a single growth goal, ignoring the coordination between blade structural strength and expansion capacity.

[0005] Low absorption efficiency: The utilization rate of trace elements (such as zinc and boron) in traditional fertilizers is low. Due to the limited adsorption and penetration capacity of leaves, the fertilizer effect is restricted.

[0006] Insufficient stability: Foliar fertilizers are easily affected by external conditions (such as high temperature, light, etc.) during storage and spraying, and nutrients are easily inactivated or precipitated, affecting the effect.

[0007] Environmentally unfriendly: The chemical ingredients in some traditional foliar fertilizers can easily have a negative impact on the environment, such as causing the accumulation of metal ions in the soil or polluting water bodies.

[0008] In response to the above technical difficulties, there is an urgent need for an innovative foliar fertilizer that can comprehensively enhance the leaf expansion ability of economic forest crops, increase leaf length, and improve leaf toughness, while achieving high absorption rate, high stability and environmental friendliness, so as to promote the efficient production of economic forest crops and improve economic benefits.

[0009] Based on scientific nutrient composition ratios and technical optimization, the present invention has developed a new type of foliar fertilizer integrating multiple functions, aiming to improve the photosynthesis efficiency and comprehensive production capacity of economic forest crops by improving the functional growth indicators of leaves, thereby filling the technical gaps of existing products. Summary of the invention

[0010] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a foliar fertilizer for increasing the leaf expansion, leaf length and leaf toughness of economic forest crops, and a preparation method and an application method thereof. The foliar fertilizer of the present invention is designed according to the multi-dimensional needs of leaf growth, and through a scientific combination of nutrients, the high efficiency, stability and environmental friendliness of nutrient supply are achieved, which significantly improves the width, length and toughness of the leaves of economic forest crops, enhances the efficiency of photosynthesis, makes the leaves less prone to damage, and improves the overall yield and quality of the crops.

[0011] To achieve the above purpose, the present invention adopts the following technical solutions:

[0012] A foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops comprises the following components: a nitrogen-phosphorus-potassium compound, wherein the weight ratio of nitrogen-phosphorus-potassium is 15-5-20; a boron-sugar alcohol compound, wherein the weight concentration is 0.05%-0.1%; a zinc-amino acid compound, wherein the weight concentration is 0.02%-0.08%; chitosan nanoparticles, wherein the weight concentration is 0.01%-0.05%; and a humic acid compound, wherein the weight concentration is 0.1%-0.2%.

[0013] The method for preparing the foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops comprises the following steps:

[0014] S1. Prepare NPK compound fertilizer liquid: add nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer into water, so that the mass ratio of nitrogen, phosphorus and potassium reaches 15-5-20, and all fertilizers are fully dissolved to obtain NPK compound fertilizer liquid;

[0015] S2. Prepare a boron-sugar alcohol complex solution: add boric acid to water and dissolve it; add sugar alcohol to the boric acid solution and stir continuously to ensure that the two are completely mixed to form a chelated complex; continue stirring for 10-15 minutes to allow the boron and sugar alcohol to fully react and form a stable complex solution;

[0016] S3. Prepare a zinc-amino acid complex solution: add zinc salt into water to dissolve to obtain a uniform zinc solution; add amino acids into the zinc solution and stir continuously to promote the formation of a zinc-amino acid complex; continue stirring for 10-15 minutes to ensure that zinc and amino acids are completely chelated to obtain a uniform and transparent zinc-amino acid complex solution;

[0017] S4, preparing a chitosan nanoparticle suspension: adding acetic acid to water, taking chitosan powder and adding it to the acidified water to dissolve it to form a transparent chitosan solution; placing the dissolved chitosan solution in an ultrasonic processor to form chitosan nanoparticles and evenly disperse them to obtain a chitosan nanoparticle suspension;

[0018] S5. preparing a humic acid complex solution: adding the humic acid complex to water, ensuring that the humic acid complex is completely dissolved in the water, until the solution is uniform and free of particles, to obtain a humic acid complex solution;

[0019] S6. Prepare foliar fertilizer: mix the prepared NPK compound fertilizer solution, boron-sugar alcohol complex solution, zinc-amino acid complex solution, chitosan nanoparticle suspension and humic acid complex solution in proportion and stir evenly.

[0020] As a preferred embodiment: in step S2, the boron-sugar alcohol complex further comprises polyethylene glycol, EDTA and cyclodextrin, and the molar ratio of polyethylene glycol:EDTA:cyclodextrin:boron:sugar alcohol is 1:0.05:0.2:1:10.

[0021] As a preferred solution: the composite solution formed in step S2 is supplemented with water to adjust the concentration to 0.05%-0.1%.

[0022] As a preferred solution: in step S3, the amino acid is glycine or lysine, and the concentration of the zinc-amino acid complex is 0.02%-0.08%.

[0023] As a preferred solution: in step S4, acetic acid is added to water, and the pH value of the solution is adjusted to 4.0; the concentration of the chitosan nanoparticle suspension is 0.01%-0.05%.

[0024] As a preferred solution: the prepared NPK compound fertilizer solution, boron-sugar alcohol complex solution, zinc-amino acid complex solution, chitosan nanoparticle suspension and humic acid complex solution are respectively placed in light-proof sealed containers and stored in a cool and dry place to avoid high temperature and light to ensure solution stability.

[0025] The method for applying foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops comprises the following steps: the foliar fertilizer is diluted at a ratio of 0.1% to 0.3% and sprayed on the front and back sides of plant leaves during the vigorous growth period and the maintenance period; the prepared foliar fertilizer needs to be used up within 1 to 2 weeks and should not be mixed with alkaline substances.

[0026] As a preferred solution: the foliar fertilizer is sprayed on the leaves of the plants during the vigorous growth period, specifically: during the growth period of the plants, sprayed once every 7-10 days.

[0027] As a preferred solution: the foliar fertilizer is sprayed on the plant leaves during the maintenance period, specifically: during the dormant period or growth slowdown period of the plant, sprayed once every 3-4 weeks.

[0028] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that the foliar fertilizer of the present invention significantly improves the width, length and toughness of the leaves of economic forest crops through a scientific combination of nutrients, enhances the efficiency of photosynthesis, makes the leaves less prone to damage, and improves the overall yield and quality of the crops; the foliar fertilizer preparation method provided in the present application is used to conveniently and quickly prepare foliar fertilizer, and a suitable preparation process and ratio are used to obtain foliar fertilizer with significant foliar effects. DETAILED DESCRIPTION

[0029] A foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops comprises the following components: a nitrogen-phosphorus-potassium compound, wherein the weight ratio of nitrogen-phosphorus-potassium is 15-5-20; a boron-sugar alcohol compound, wherein the weight concentration is 0.05%-0.1%; a zinc-amino acid compound, wherein the weight concentration is 0.02%-0.08%; chitosan nanoparticles, wherein the weight concentration is 0.01%-0.05%; and a humic acid compound, wherein the weight concentration is 0.1%-0.2%.

[0030] The preparation method of the foliar fertilizer for increasing the leaf expansion, leaf growth and leaf toughness of economic forest crops comprises the following steps:

[0031] S1. Prepare NPK compound fertilizer liquid: add nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer into water, so that the mass ratio of nitrogen, phosphorus and potassium reaches 15-5-20, and all fertilizers are fully dissolved to obtain NPK compound fertilizer liquid;

[0032] S2. Prepare a boron-sugar alcohol complex solution: add boric acid to water and dissolve it; add sugar alcohol to the boric acid solution and stir continuously to ensure that the two are completely mixed to form a chelated complex CHO·B(OH); continue stirring for 10-15 minutes to allow the boron and sugar alcohol to fully react and form a stable complex solution; the sugar alcohol is sorbitol,

[0033] S3. Prepare a zinc-amino acid complex solution: add zinc salt into water to dissolve to obtain a uniform zinc solution; add amino acids into the zinc solution and stir continuously to promote the formation of a zinc-amino acid complex; continue stirring for 10-15 minutes to ensure that zinc and amino acids are completely chelated to obtain a uniform and transparent zinc-amino acid complex solution;

[0034] Purpose of use: Traditional zinc salts are prone to cause metal ion accumulation and environmental pollution due to excessive application after being applied to the soil or leaves. Zinc-amino acid complex has good biodegradability and environmental friendliness, which can avoid long-term pollution to soil and water.

[0035] S4, preparing a chitosan nanoparticle suspension: adding acetic acid to water, taking chitosan powder and adding it to the acidified water to dissolve it to form a transparent chitosan solution; placing the dissolved chitosan solution in an ultrasonic processor to form chitosan nanoparticles and evenly disperse them to obtain a chitosan nanoparticle suspension;

[0036] S5. preparing a humic acid complex solution: adding the humic acid complex to water, ensuring that the humic acid complex is completely dissolved in the water, until the solution is uniform and free of particles, to obtain a humic acid complex solution;

[0037] S6. Prepare foliar fertilizer: mix the prepared NPK compound fertilizer solution, boron-sugar alcohol complex solution, zinc-amino acid complex solution, chitosan nanoparticle suspension and humic acid complex solution in proportion and stir evenly.

[0038] In step S2, the boron-sugar alcohol complex further comprises polyethylene glycol, EDTA and cyclodextrin, and the molar ratio of polyethylene glycol:EDTA:cyclodextrin:boron:sugar alcohol is 1:0.05:0.2:1:10.

[0039] The addition of the polyhydroxy compound polyethylene glycol (PEG) in step S2 can provide additional hydroxyl groups, form weak interactions with boron, enhance the overall stability of the complex, and reduce the risk of decomposition due to pH fluctuations in the solution; adding a trace amount of biocompatible metal chelators (such as EDTA) prevents the instability of the complex caused by metal ion contamination. Improve the long-term storage stability of the solution; adding cyclodextrin can enclose part of the boron or sugar alcohol molecules through its inner cavity to form a stable inclusion complex. Provide special structural protection to prevent degradation caused by the external environment (such as light and oxygen). Improve the solubility and storage stability of the complex.

[0040] Boron concentration:

[0041] 1. Boron mass fraction: 0.05%-0.1%, in the form of boric acid (B(OH), molecular weight ≈ 61.83 g / mol).

[0042] 2. Basis for calculating the molar number of the element converted into boron.

[0043] Ingredient ratio:

[0044] PEG:EDTA:cyclodextrin:boron:sorbitol=1:0.1:0.2:1:5 (molar ratio)

[0045] Total solution volume assumptions:

[0046] 1. Assume that 1L of foliar fertilizer solution is prepared.

[0047] Calculate ingredient ratios

[0048] 1. Number of moles of boron

[0049] Quality range:

[0050] Boric acid mass (B(OH)) = total solution mass × boron concentration

[0051] Low concentration (0.05%):

[0052] 1,000g×0.0005=0.5g

[0053] High concentration (0.1%):

[0054] 1,000g×0.001=1.0g

[0055] Mole calculation:

[0056] Number of moles = mass ÷ molecular weight

[0057] Low concentration: 0.5g÷61.83g / mol≈0.0081mol

[0058] High concentration: 1.0g÷61.83g / mol≈0.0162mol

[0059] Amount of each component (molar number)

[0060] According to the molar ratio (PEG: EDTA: cyclodextrin: boron: sorbitol = 1: 0.1: 0.2: 1: 5), calculate the other ingredients:

[0061]

[0062]

[0063] 3. Amount of each ingredient (mass)

[0064] Convert moles to mass:

[0065]

[0066] According to the calculation results, the mass ratio of each component when the boron concentration is 0.05%-0.1% is obtained:

[0067] Element Ratio range (low concentration) Ratio range (high concentration) PEG 3.24g 6.48g EDTA 0.24g 0.47g Cyclodextrin 1.84g 3.67g Boron (B(OH)) 0.5g 1.0g Sorbitol 7.38g 14.76g

[0068] The ratio of polyethylene glycol (PEG): EDTA: cyclodextrin: boron: sorbitol (mass ratio range) is:

[0069] Low concentration (0.05% boron): 3.24:0.24:1.84:0.5:7.38

[0070] High concentration (0.1% boron): 6.48:0.47:3.67:1.0:14.76

[0071] The composite solution formed in step S2 is supplemented with water to adjust the concentration to 0.05%-0.1%.

[0072] In step S3, the amino acid is glycine or lysine, and the concentration of the zinc-amino acid complex is 0.02%-0.08%.

[0073] In step S4, acetic acid is added to water, and the pH value of the solution is adjusted to 4.0; the concentration of the chitosan nanoparticle suspension is 0.01%-0.05%.

[0074] The prepared NPK compound fertilizer solution, boron-sugar alcohol complex solution, zinc-amino acid complex solution, chitosan nanoparticle suspension and humic acid complex solution are respectively placed in light-proof sealed containers, stored in a cool and dry place to avoid high temperature and light, and ensure the stability of the solution.

[0075] The invention discloses a method for applying foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops. The foliar fertilizer is diluted at a ratio of 0.1% to 0.3% and sprayed on the front and back sides of plant leaves during the vigorous growth period and the maintenance period. The prepared foliar fertilizer needs to be used up within 1 to 2 weeks and should not be mixed with alkaline substances.

[0076] The foliar fertilizer is sprayed on the plant leaves during the vigorous growth period. Specifically: during the growth period of the plant, spray once every 7-10 days.

[0077] The foliar fertilizer is sprayed on the plant leaves during the maintenance period: specifically, spray once every 3-4 weeks during the plant's dormant period or growth slowdown period.

[0078] Example 1: Foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops

[0079] Group A (basic ratio):

[0080] 1. NPK compound fertilizer liquid: 15-5-20

[0081] 2. Boron-sugar alcohol complex: 0.05%

[0082] 3. Zinc-amino acid complex: 0.02%

[0083] 4. Chitosan nanoparticles: 0.01%

[0084] 5. Humic acid complex: 0.1%

[0085] Group B (higher in nitrogen and potassium):

[0086] 1. NPK compound fertilizer liquid: 20-5-25

[0087] 2. Boron-sugar alcohol complex: 0.075%

[0088] 3. Zinc-amino acid complex: 0.04%

[0089] 4. Chitosan nanoparticles: 0.02%

[0090] 5. Humic acid complex: 0.15%

[0091] Group C (High Boron and Zinc):

[0092] 1. NPK compound fertilizer liquid: 15-5-20

[0093] 2. Boron-sugar alcohol complex: 0.1%

[0094] 3. Zinc-amino acid complex: 0.06%

[0095] 4. Chitosan nanoparticles: 0.03%

[0096] 5. Humic acid complex: 0.2%

[0097] Group D (control group): no foliar fertilizer was used.

[0098] Example 2: Preparation method of foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops

[0099] S1. Prepare NPK compound fertilizer solution:

[0100] 1. Add nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer to 500ml of deionized water, so that the ratio of nitrogen, phosphorus and potassium reaches 15-5-20, and the corresponding addition amounts are:

[0101] 1. Nitrogen fertilizer: 15g

[0102] 2. Phosphate fertilizer: 5g

[0103] 3. Potassium fertilizer: 20g

[0104] 2. Stir evenly until all fertilizers are fully dissolved. This mixture is used as the base solution for later use;

[0105] S2. Prepare boron-sugar alcohol complex solution: In a container, take 100 ml of deionized water, weigh 0.075 g of boric acid (or borate) according to the target concentration of 0.05%-0.1%, and add it to the deionized water. Use a magnetic stirrer or a glass rod to stir until the boric acid is completely dissolved to ensure that the boron element is evenly distributed in the water. Weigh sugar alcohols (such as sorbitol) so that the molar ratio of sugar alcohol to boron is 1:1 (to ensure the chelating effect). For 0.075 g of boric acid, an appropriate amount of sugar alcohol can be prepared, such as about 0.2 g. Slowly add the sugar alcohol to the boric acid solution and continue stirring to ensure that the two are completely mixed to form a chelated complex. Continue stirring for 10-15 minutes to allow boron and sugar alcohol to fully react and form a stable complex solution. Ensure that the solution has no obvious particles or precipitates, and filter through a microporous filter membrane if necessary. Add deionized water to 100 ml of the solution and adjust it to the target concentration range (0.05%-0.1%). After the dilution is completed, stir the solution evenly. The prepared boron-sugar alcohol complex solution should be stored away from light as much as possible, and should be sealed and placed in a cool and dry place to prevent photolysis or temperature changes from affecting the chelation stability.

[0106] S3. Prepare zinc-amino acid complex solution: Use a precision balance to weigh 0.05g of zinc salt (such as zinc sulfate or zinc chloride) and set aside. Prepare deionized water. Pour deionized water to the 100ml mark in a 100ml beaker as a solvent for dissolving the zinc salt. Add the weighed 0.05g zinc salt to the deionized water and stir with a magnetic stirrer or a glass stirring rod until the zinc salt is completely dissolved to obtain a uniform zinc solution. Weigh an appropriate amount of glycine or lysine (about 0.1g according to the chelation ratio of zinc to amino acids). Add glycine or lysine gradually to the zinc solution and continue stirring to promote the combination of zinc with glycine or lysine to form a zinc-amino acid complex. Continue stirring for 10-15 minutes to ensure that zinc is completely chelated with glycine or lysine and to obtain a uniform, transparent zinc-amino acid complex solution. If the solution concentration needs to be fine-tuned, add an appropriate amount of deionized water to ensure that the zinc-amino acid complex concentration is within the range of 0.02%-0.08%. If there are particles or impurities in the solution, use a microporous filter membrane to filter it to obtain a clear complex solution. Put the prepared zinc-amino acid complex solution into a light-proof sealed container and store it in a cool and dry place to avoid high temperature and light affecting the stability of the solution.

[0107] S4. Preparation of chitosan nanoparticle suspension: In a 100ml beaker, add about 98ml of deionized water. Add an appropriate amount of acetic acid to adjust the pH of the solution to about 4.0 to help dissolve chitosan. Use a precision balance to weigh 0.03g of chitosan powder. Slowly add the chitosan powder to the acidified deionized water, and continue stirring with a magnetic stirrer or a glass stirring rod until the chitosan is completely dissolved to form a transparent chitosan solution. Place the dissolved chitosan solution in an ultrasonic processor and process for about 10-20 minutes so that the chitosan forms nanoparticles and is evenly dispersed to obtain a nanoparticle suspension. Ultrasonic treatment can help reduce the particle size and make the particles more uniform. Ensure that the concentration of chitosan nanoparticles in the suspension is in the range of 0.01%-0.05%, and add deionized water to 100ml if necessary. Gently stir the solution to ensure that the particles are evenly dispersed to complete the preparation of the chitosan nanoparticle suspension. The chitosan nanoparticle suspension was poured into a light-proof sealed container and stored in a cool and dry place to maintain the stability of the nanoparticles.

[0108] S5. Prepare humic acid complex solution: Use a precision balance to weigh 0.15g of humic acid complex and set aside. Pour deionized water into a 100ml beaker to ensure that the amount of water is 100ml. Slowly add the weighed 0.15g humic acid complex to the deionized water. Use a magnetic stirrer or a glass stirring rod to continuously stir the solution to ensure that the humic acid complex is completely dissolved in the water until the solution is uniform and free of particles. Observe whether the solution is completely clear and there are no residual solid particles to ensure that the humic acid is evenly distributed in the solution. If necessary, continue stirring for a few minutes. Pour the prepared humic acid solution into a sealed container and store it in a cool and dry place to avoid direct sunlight that affects the stability of the solution.

[0109] S6. Configure foliar fertilizer:

[0110] 1. Mix all the prepared solutions (NPK compound fertilizer solution, boron-sugar alcohol complex solution, zinc-amino acid complex solution, chitosan nanoparticle suspension and humic acid complex solution) in proportion, and the final total liquid volume is 1L.

[0111] 2. Make up to 1L with deionized water.

[0112] 3. Finally, stir evenly to fully mix all the ingredients and ensure that the foliar fertilizer liquid is uniform.

[0113] Storage and use

[0114] 1. The prepared foliar fertilizer liquid should be stored in a cool and dry place, away from direct sunlight.

[0115] 2. When using, you can spray the foliar fertilizer liquid directly on the plant leaves. Spraying once a week will help promote leaf growth, enhance resistance and improve leaf structure.

[0116] Example 3: Verify the physical and chemical stability of foliar fertilizers, including solution uniformity, pH value, nutrient content changes, and compatibility between ingredients, to ensure effectiveness during storage and spraying.

[0117] 1. Solution appearance and uniformity: Check whether the solution shows precipitation, stratification or turbidity under different storage conditions (normal temperature, high temperature, low temperature).

[0118] 2. pH change: Measure the pH value of the solution under different storage conditions and observe whether it changes within the appropriate range (e.g. 6.5-7.5).

[0119] 3. Nutrient content: Focus on testing whether the content of boron-sugar alcohol complex, zinc-amino acid complex, chitosan nanoparticles and humic acid is stable.

[0120] 4. Spraying stability: simulate the leaf spraying environment (light, humidity, wind speed, etc.) to observe whether the uniformity of the solution and the nutrient adsorption effect meet expectations.

[0121] Solution Appearance

[0122] condition Initial state Status after 30 days Status after 60 days Normal temperature (25℃) Transparent uniform liquid Transparent uniform liquid Transparent uniform liquid High temperature (40℃) Transparent uniform liquid Slightly yellow, no precipitation Slightly yellow, no precipitation Low temperature (4℃) Transparent uniform liquid Transparent uniform liquid Transparent uniform liquid

[0123] pH Changes

[0124] condition Initial pH pH after 30 days pH after 60 days Normal temperature (25℃) 6.8 6.7 6.6 High temperature (40℃) 6.8 6.6 6.5 Low temperature (4℃) 6.8 6.8 6.8

[0125] Nutrient content

[0126] Element Initial content (%) Content after 30 days (%) Content after 60 days (%) Boron-sugar alcohol complex 0.08 0.079 0.078 Zinc-Amino Acid Complex 0.05 0.049 0.048 Chitosan Nanoparticles 0.03 0.03 0.03 Humic acid compound 0.15 0.15 0.15

[0127] Spraying uniformity: The solution is evenly distributed on the leaf surface without obvious aggregation or dripping.

[0128] Adsorption effect: A uniform adsorption layer is formed on the leaf surface, with no obvious loss within 48 hours.

[0129] Through stability tests, the foliar fertilizer showed good physical and chemical stability under normal temperature, high temperature and low temperature conditions, and key components such as boron-sugar alcohol complex, zinc-amino acid complex and chitosan nanoparticles maintained effective concentrations during storage and spraying, which can meet the target requirements of leaf expansion and toughness enhancement. The test results support the practical application and promotion of the foliar fertilizer of the present invention.

[0130] Example 4: Index Measurement

[0131] Experimental subjects: Select a number of consistent and representative plants (e.g. 10 plants) and conduct group experiments (e.g. control group and experimental group).

[0132] Indicator measurements: Plant height (cm): Measure from the ground to the top of the plant using a ruler.

[0133] Number of leaves: The total number of leaves per plant was manually counted.

[0134] Leaf area per plant (cm 2 ): Select 3 leaves in the middle of the plant, use a leaf area meter to measure, and take the average value.

[0135] Blade thickness (mm): Use a vernier caliper to measure the thickness of the middle of the selected blade and take the average value.

[0136] Puncture resistance (N): Use a puncture resistance tester to perform puncture tests on the selected leaves and take the average value.

[0137] Biomass (g): Randomly cut some samples (leaves and stems) at the end of each week, clean them and dry them at 105°C to constant weight, and record the dry weight.

[0138] Indocalamus leaf data record table

[0139]

[0140] Plant height: Average growth rate is 3-4cm per week.

[0141] In the 4th week, the plant height increased by 11-12cm compared with the 1st week.

[0142] Number of leaves: an average of 3-4 leaves per week; the average number of leaves in the 4th week was 21-22, indicating that leaf differentiation was significantly enhanced.

[0143] Leaf area per plant: average increase of 15-20cm per week 2 ; In the 4th week, the leaf area of ​​a single plant increased to 112-120cm 2 , greatly improving the photosynthesis capacity of leaves.

[0144] Leaf width: Leaf width increased from 4.0-4.3cm to 8.0-8.5cm, indicating that foliar fertilizer significantly promoted the lateral expansion of leaves.

[0145] Leaf length: Leaf length increased from 14.5-15.5 cm to 34.0-36.0 cm, close to the expected maximum length range (35-40 cm); experiments showed that foliar fertilizer treatment significantly accelerated the longitudinal growth of leaves.

[0146] Blade thickness: increased by an average of 0.04-0.06mm per week; in the 4th week, the blade thickness increased by 0.14mm compared to the 1st week, which improved the structural strength of the blade.

[0147] Puncture resistance: The puncture resistance increased from 1.5N in the first week to 2.5-2.6N in the fourth week, an increase of 60%-70%.

[0148] Biomass: An average weekly increase of 1.0-1.2 g; the biomass of a single plant was 5.8-5.9 g in the fourth week, an increase of more than 100% over the first week.

[0149] Oil tea data record table:

[0150]

[0151]

[0152] Results Analysis

[0153] 1. Plant height

[0154] Average weekly growth: about 3-4cm.

[0155] Height in the 4th week: grows to 28-29cm, an increase of about 55%-60% from the 1st week.

[0156] 2. Number of blades

[0157] Average weekly increase: about 2-4 tablets.

[0158] Number in the 4th week: The average number of leaves per plant reached 23-24, an increase of 60% from the 1st week.

[0159] 3. Leaf area per plant

[0160] Week 1: 11.2-12.5 cm 2 .

[0161] Week 4: 20.2-21.5 cm 2 , an increase of 80%-90%.

[0162] 4. Blade width

[0163] Average weekly increase: about 0.3-0.4cm.

[0164] Width at 4th week: Leaf width reaches 3.4-3.5cm, close to the maximum width range.

[0165] 5. Leaf length

[0166] Average weekly increase: about 0.5-0.8cm.

[0167] Leaf length in the 4th week: grew to 7.8-8.0 cm, reaching the expected maximum range (8 cm).

[0168] 6. Blade thickness

[0169] Week 1: 0.30-0.31mm.

[0170] Week 4: 0.45-0.46mm, an increase of about 50%, and the blade structure strength is significantly improved.

[0171] 7. Puncture resistance

[0172] Week 1: 1.8-1.9N.

[0173] Week 4: 3.1-3.3N, an increase of 70%-80%.

[0174] 8. Biomass

[0175] Week 1: 3.0-3.2 g.

[0176] Week 4: 6.0-6.4g, an increase of more than 100%, indicating that the material accumulation capacity has been significantly enhanced. Data record table of Litsea cubeba leaves

[0177]

[0178] Results Analysis

[0179] 1. Plant height

[0180] Average weekly growth: about 2.5-3.0cm.

[0181] Height in the 4th week: grows to 21-22cm, an increase of about 50%-55% from the 1st week.

[0182] 2. Number of blades

[0183] Average weekly increase: about 2 tablets.

[0184] Quantity in the 4th week: The number of leaves per plant reached 15-16, an increase of 50%-60% over the 1st week.

[0185] 3. Leaf area per plant

[0186] Week 1: 7.5-8.2 cm 2 .

[0187] Week 4: 15.3-16.2 cm 2 , increased by 90%-100%.

[0188] 4. Blade width

[0189] Average weekly increase: about 0.2-0.3cm.

[0190] Width at Week 4: The leaf width reached 3.0 cm, reaching the expected maximum width.

[0191] 5. Leaf length

[0192] Average weekly increase: about 0.4-0.6cm.

[0193] Leaf length in the 4th week: grew to 6.0cm, reaching the expected maximum length.

[0194] 6. Blade thickness

[0195] Week 1: 0.24-0.26mm.

[0196] Week 4: 0.36-0.37mm, an increase of about 50%.

[0197] 7. Puncture resistance

[0198] Week 1: 1.4-1.5N.

[0199] Week 4: 2.4-2.6N, an increase of 70%-85%.

[0200] 8. Biomass

[0201] Week 1: 1.9-2.1 g.

[0202] Week 4: 3.8-4.1g, an increase of more than 100%, indicating that the ability to accumulate substances has been significantly enhanced.

[0203] The present invention proposes a foliar fertilizer composition and an application method thereof suitable for promoting the growth of economic forest crops (such as oil-tea camellia, litsea cubeba, indigo bamboo, etc.). Experimental results show that the foliar fertilizer has significant effects in improving crop growth performance, increasing photosynthesis efficiency and enhancing resistance. The following is the overall conclusion of the present invention:

[0204] 1. Significant growth promotion effect

[0205] Plant height growth: After using foliar fertilizer, the plant height increased by 50%-60% compared with the control group, showing a significant vertical growth advantage.

[0206] Increased leaf number: The number of leaves increased by 50%-70%, indicating that foliar fertilizer effectively promoted leaf differentiation and new leaf growth.

[0207] 2. Enhanced blade expansion capability

[0208] Leaf length and leaf width reach the ideal range:

[0209] The oil tea leaves are 7.8-8cm long and 3.4-3.5cm wide.

[0210] The leaves of Litsea cubeba are 6cm long and 3cm wide.

[0211] The leaves of Indocalamus are 35-40cm long and 8-9cm wide.

[0212] Increased leaf area per plant: The leaf area per plant increased by 80%-110% compared to untreated plants, enhancing photosynthesis efficiency.

[0213] 3. Blade structure performance optimization

[0214] Leaf thickness: Leaf thickness increases by 50%-60%, and the cell wall structure becomes more stable.

[0215] Puncture resistance: The puncture resistance is increased by 70%-85%, the toughness of the leaves is significantly enhanced, and the ability to resist mechanical damage and environmental stress is improved.

[0216] 4. Enhanced material accumulation capacity

[0217] Biomass increased significantly: After applying foliar fertilizer, the dry matter accumulation of the plants increased by 100%-110%, indicating that foliar fertilizer effectively promoted the synthesis and storage of substances.

[0218] 5. Environmental friendliness and multifunctionality

[0219] Through scientific proportions and technical optimization, this foliar fertilizer significantly improves the absorption efficiency of trace elements (such as boron, zinc, etc.), reduces nutrient loss, and demonstrates strong environmental protection.

[0220] Foliar fertilizer not only promotes plant growth, but also enhances the toughness and resistance of leaves, adapting to the growth needs of a variety of economic forest crops and has wide applicability.

[0221] The foliar fertilizer of the present invention plays an important role in improving the yield and quality of economic forest crops, and provides an efficient and environmentally friendly nutrition management solution for economic forest planting. Its significant growth promotion effect and environmentally friendly characteristics make it have the potential for large-scale promotion and application, and provide important technical support for the sustainable development of the economic forest industry; the present invention has both technical innovation, practicality and economic benefits, has extremely high application value, and can be widely used in agricultural and forestry production.

[0222] The design focus of the present invention is that the foliar fertilizer of the present invention significantly improves the width, length and toughness of the leaves of economic forest crops through a scientific combination of nutrients, enhances the efficiency of photosynthesis, makes the leaves less susceptible to damage, and improves the overall yield and quality of the crops; the foliar fertilizer preparation method provided in the present application is used to conveniently and quickly prepare foliar fertilizer, and a suitable preparation process and ratio are used to obtain foliar fertilizer with significant foliar effects.

[0223] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops, characterized in that: The invention comprises the following components: a nitrogen-phosphorus-potassium complex, wherein the weight ratio of nitrogen-phosphorus-potassium is 15-5-20; a boron-sugar alcohol complex, wherein the weight concentration is 0.05%-0.1%; a zinc-amino acid complex, wherein the weight concentration is 0.02%-0.08%; and chitosan nanoparticles, wherein the weight concentration is 0.01%-0.05%; The humic acid complex has a weight concentration of 0.1%-0.2%.

2. A method for preparing the foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops as claimed in claim 1, characterized in that: The steps include: S1. Prepare NPK compound fertilizer liquid: add nitrogen fertilizer, phosphorus fertilizer and potassium fertilizer into water, so that the mass ratio of nitrogen, phosphorus and potassium reaches 15-5-20, and all fertilizers are fully dissolved to obtain NPK compound fertilizer liquid; S2. Prepare a boron-sugar alcohol complex solution: add boric acid to water and dissolve it; add sugar alcohol to the boric acid solution and stir continuously to ensure that the two are completely mixed to form a chelated complex; continue stirring for 10-15 minutes to allow the boron and sugar alcohol to fully react and form a stable complex solution; S3. Prepare a zinc-amino acid complex solution: add zinc salt into water to dissolve to obtain a uniform zinc solution; add amino acids into the zinc solution and stir continuously to promote the formation of a zinc-amino acid complex; continue stirring for 10-15 minutes to ensure that zinc and amino acids are completely chelated to obtain a uniform and transparent zinc-amino acid complex solution; S4, preparing a chitosan nanoparticle suspension: adding acetic acid to water, taking chitosan powder and adding it to the acidified water to dissolve it to form a transparent chitosan solution; placing the dissolved chitosan solution in an ultrasonic processor to form chitosan nanoparticles and evenly disperse them to obtain a chitosan nanoparticle suspension; S5. preparing a humic acid complex solution: adding the humic acid complex to water, ensuring that the humic acid complex is completely dissolved in the water, until the solution is uniform and free of particles, to obtain a humic acid complex solution; S6. Prepare foliar fertilizer: mix the prepared NPK compound fertilizer solution, boron-sugar alcohol complex solution, zinc-amino acid complex solution, chitosan nanoparticle suspension and humic acid complex solution in proportion and stir evenly.

3. The method for preparing the foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops according to claim 2, characterized in that: In step S2, the boron-sugar alcohol complex further comprises polyethylene glycol, EDTA and cyclodextrin, and the molar ratio of polyethylene glycol:EDTA:cyclodextrin:boron:sugar alcohol is 1:0.05:0.2:1:

10.

4. The method for preparing the foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops according to claim 2, characterized in that: The composite solution formed in step S2 is supplemented with water to adjust the concentration to 0.05%-0.1%.

5. The method for preparing the foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops according to claim 2, characterized in that: In step S3, the amino acid is glycine or lysine, and the concentration of the zinc-amino acid complex is 0.02%-0.08%.

6. The method for preparing the foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops according to claim 2, characterized in that: In step S4, acetic acid is added to water, and the pH value of the solution is adjusted to 4.0; the concentration of the chitosan nanoparticle suspension is 0.01%-0.05%.

7. The method for preparing the foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops according to claim 2, characterized in that: The prepared NPK compound fertilizer solution, boron-sugar alcohol complex solution, zinc-amino acid complex solution, chitosan nanoparticle suspension and humic acid complex solution are respectively placed in light-proof sealed containers and stored in a cool and dry place to avoid high temperature and light to ensure solution stability.

8. A method for applying foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops as claimed in claim 1, characterized in that: The foliar fertilizer is diluted at a ratio of 0.1%-0.3% and sprayed on the front and back sides of plant leaves during the vigorous growth period and the maintenance period; the prepared foliar fertilizer needs to be used up within 1-2 weeks and should not be mixed with alkaline substances.

9. The method for applying foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops according to claim 8, characterized in that: The foliar fertilizer is sprayed on the leaves of the plants during the vigorous growth period, specifically: during the growth period of the plants, spray once every 7-10 days.

10. The method for applying foliar fertilizer for increasing leaf expansion, leaf growth and leaf toughness of economic forest crops according to claim 8, characterized in that: The foliar fertilizer is sprayed on the plant leaves during the maintenance period, specifically: during the dormant period or growth slowdown period of the plant, spraying once every 3-4 weeks.

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