A copper-containing trace element water-soluble fertilizer, its preparation method and application

Abstract

This invention belongs to the field of fertilizer preparation technology, specifically relating to a copper-containing micronutrient water-soluble fertilizer, its preparation method, and its application. The copper-containing micronutrient water-soluble fertilizer provided by this invention comprises a copper-containing compound and seaweed powder. By adding seaweed powder to the copper-containing compound, the absorption of copper ions by crops is promoted, improving fertilizer utilization. Simultaneously, dispersants, wetting agents, and other excipients are added, solving the problem of easy sedimentation and solidification of the copper-containing compound due to its high density, thus extending the product's shelf life. Furthermore, the copper-containing micronutrient water-soluble fertilizer provided by this invention is stored in liquid form, facilitating use and measurement. The fertilizer is prepared by grinding to a particle size (D...). 50 At a depth of 1–5 μm, it can be applied via foliar spraying to reduce losses due to soil absorption. Examples and application results demonstrate that applying the copper-containing water-soluble fertilizer provided by this invention to crops such as tomatoes, citrus, and grapes can increase yield and improve quality.

Description

Technical Field

[0001] This invention belongs to the field of fertilizer preparation technology, specifically relating to a copper-containing trace element water-soluble fertilizer, its preparation method, and its application. Background Technology

[0002] Copper is an essential micronutrient for plant growth and development. It is a component or activator of various oxidases in crops, including cytochrome oxidase, ascorbic acid oxidase, polyphenol oxidase, laccase, and superoxide dismutase. It is also an important component of plastocyanin. Therefore, copper is closely related to photosynthesis, respiration, chlorophyll and protein synthesis, and the enhancement of crop resistance to diseases and lodging. Copper deficiency in crops leads to reduced chlorophyll, chlorosis in leaves, damage to reproductive organs, and wilting.

[0003] Copper-containing micronutrient fertilizers mainly include copper sulfate pentahydrate, copper sulfate monohydrate, basic copper carbonate, copper chloride, copper oxide, cuprous oxide, ammonium copper silicate, copper sulfide, and basic copper chloride. However, these substances have relatively high density, making them prone to sedimentation and difficult for crops to absorb, thus affecting their effectiveness. Furthermore, chelating agents such as EDTA and DTPA are often added to obtain chelated micronutrient fertilizers that are easier for crops to absorb. These chelating agents contain amino or hydroxycarboxylic acids, polyphosphates, etc. While they have good chelating properties and are stable, their degradation products easily accumulate in the environment, causing harm. For example, under natural conditions, EDTA first converts to ethylenediamine triacetate, then cyclizes to 3-ketopiperazine-N,N-diacetate, becoming a persistent organic pollutant that accumulates in the environment, harming both crops and the environment. DTPA, similar to EDTA, is also a non-biodegradable chelating agent. Therefore, the European Union has begun to restrict the use of chelating agents such as EDTA and DTPA in micronutrient fertilizers.

[0004] Therefore, there is an urgent need for a micronutrient fertilizer that promotes the absorption and utilization of copper without the need for chelating agents, in order to meet the current needs of agricultural development. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a copper-containing composition and a copper-containing trace element water-soluble fertilizer, which mixes seaweed powder with insoluble copper to promote the absorption and utilization of trace element copper ions by crops, without the need to add any chelating agents, thus minimizing harm to crops and the environment, and is green and environmentally friendly.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The present invention provides a copper-containing composition comprising, by weight, 5 to 30 parts of a copper compound and 1 to 5 parts of seaweed powder.

[0008] Preferably, the copper-containing compound includes copper chloride, basic copper chloride, copper sulfate, or copper oxide; the seaweed powder includes brown algae powder and / or red algae powder.

[0009] The present invention also provides the use of the above-mentioned copper-containing composition in the preparation of copper-containing micro-fertilizers.

[0010] Preferably, the copper-containing micronutrient fertilizer includes copper-containing trace element water-soluble fertilizer.

[0011] This invention provides a copper-containing trace element water-soluble fertilizer, comprising the following components by weight percentage: 5%–30% copper compound, 1%–5% seaweed powder, 3%–5% dispersant, 1% wetting agent, 1%–2% thickener, and the balance being water.

[0012] Preferably, the dispersant comprises lignin sulfonate; the wetting agent comprises polyoxyethylene polyoxypropylene block copolymer; and the thickener comprises cellulose.

[0013] This invention provides a method for preparing the above-mentioned copper-containing trace element water-soluble fertilizer, comprising the following steps: mixing and stirring a copper-containing compound, seaweed powder, dispersant, wetting agent, and water to obtain dispersion A;

[0014] The dispersion A is ground to D. 50 =1~5μm, to obtain dispersion B;

[0015] A thickener was added to the dispersion B, and grinding was continued for 10 minutes to obtain the copper-containing trace element water-soluble fertilizer.

[0016] Preferably, during the grinding process, the temperatures of dispersion A and dispersion B are below 30°C.

[0017] The present invention also provides a method for using the copper-containing trace element water-soluble fertilizer described in the above technical solution, which is applied to crops by spraying.

[0018] The present invention also provides the application of the copper-containing composition and copper-containing trace element water-soluble fertilizer described in the above technical solutions in improving crop yield and / or improving crop quality.

[0019] Beneficial effects:

[0020] This invention provides a copper-containing composition comprising a copper compound and seaweed powder, wherein the substances contained in the seaweed have a certain chelating function. Adding seaweed powder to the copper compound can promote the absorption of copper ions by crops and improve fertilizer utilization.

[0021] This invention also provides a copper-containing trace element water-soluble fertilizer, comprising a copper compound, seaweed powder, and excipients such as dispersants and wetting agents. It is stored in liquid fertilizer form for convenient use and measurement, and the particle size (D) of the fertilizer is reduced by sand milling. 50 At a depth of 1–5 μm, it can be applied via foliar spraying to reduce losses due to soil absorption. Furthermore, adding dispersants, wetting agents, and other excipients to copper-containing micronutrient water-soluble fertilizers solves the problem of copper compounds easily settling and solidifying due to their high density, thus helping to extend the product's shelf life.

[0022] Furthermore, this invention also provides a method for preparing the above-mentioned copper-containing trace element water-soluble fertilizer, which involves mixing copper-containing compound, seaweed powder, dispersant, wetting agent, and water evenly and stirring thoroughly to obtain a dispersion; grinding the obtained dispersion, adding a thickener to the ground dispersion, and continuing grinding; the preparation process is simple and energy-saving, requires no chelating agent, is green and environmentally friendly, has little harm to the environment, has good application prospects, and is conducive to the sustainable development of agriculture.

[0023] The copper-containing trace element water-soluble fertilizer provided by this invention has good fertilizer effect, can be directly sprayed on crops, which is beneficial to crop growth and yield increase, and can bring significant economic benefits. Detailed Implementation

[0024] The present invention provides a copper-containing composition comprising, by weight, 5 to 30 parts of a copper compound and 1 to 5 parts of seaweed powder.

[0025] The copper-containing composition of the present invention comprises 5 to 30 parts by weight of a copper-containing compound, more preferably 20 to 30 parts, and even more preferably 30 parts. The copper-containing compound of the present invention preferably includes copper chloride, basic copper chloride, copper sulfate, or copper oxide, more preferably copper sulfate or copper oxide, and even more preferably copper oxide.

[0026] Based on the weight parts of the copper-containing compound, the copper-containing composition of the present invention comprises 1 to 5 parts of seaweed powder, more preferably 3 to 5 parts, and more preferably 5 parts. The seaweed powder of the present invention preferably includes brown algae powder and / or red algae powder, more preferably brown algae powder. In the present invention, the seaweed powder has a certain chelating function; when added to the copper-containing compound, it can promote the absorption of copper ions by crops and improve fertilizer utilization.

[0027] This invention provides the application of the copper-containing composition described above in the preparation of copper-containing micronutrient fertilizers. In this invention, the copper-containing micronutrient fertilizer preferably comprises a copper-containing water-soluble micronutrient fertilizer.

[0028] This invention provides a copper-containing trace element water-soluble fertilizer, comprising the following components by weight percentage: 5%–30% copper compound, 1%–5% seaweed powder, 3%–5% dispersant, 1% wetting agent, 1%–2% thickener, and the balance being water.

[0029] The copper-containing trace element water-soluble fertilizer of the present invention comprises 5% to 30% copper-containing compounds, preferably 20% to 30%, and more preferably 30% by weight percentage. The copper-containing compounds of the present invention preferably include copper chloride, basic copper chloride, copper sulfate, or copper oxide, more preferably copper sulfate or copper oxide, and more preferably copper oxide.

[0030] The copper-containing trace element water-soluble fertilizer of the present invention comprises 1% to 5% seaweed powder, preferably 3% to 5%, and more preferably 5%, by weight percentage. The seaweed powder of the present invention preferably includes brown algae powder and / or red algae powder, and more preferably brown algae powder. In the present invention, the seaweed powder has a certain chelating function; when added to the copper-containing compound, it can promote the absorption of copper ions by crops and improve fertilizer utilization.

[0031] The copper-containing trace element water-soluble fertilizer of the present invention comprises 3% to 5% dispersant, more preferably 3% to 4%, and more preferably 4%, by weight percentage. The dispersant of the present invention preferably comprises lignin sulfonate, and the lignin sulfonate preferably comprises sodium lignin sulfonate or calcium lignin sulfonate, more preferably calcium lignin sulfonate. In the present invention, the lignin sulfonate helps to uniformly disperse solid particles in the water-soluble fertilizer system.

[0032] The copper-containing trace element water-soluble fertilizer of the present invention comprises 1% wetting agent by weight percentage. The wetting agent of the present invention preferably comprises a polyoxyethylene-polyoxypropylene block copolymer. The wetting agent of the present invention helps the solid components in the water-soluble fertilizer system to be wetted by water, dispersed in water, and achieve the target particle size through grinding.

[0033] The copper-containing trace element water-soluble fertilizer of the present invention comprises 1% to 2% thickener by weight percentage, more preferably 2%. The thickener of the present invention preferably comprises cellulose. The present invention does not have a particular limitation on the type of cellulose; commercially available cellulose can be used.

[0034] The copper-containing trace element water-soluble fertilizer of the present invention, by weight percentage, also includes the remainder water to make up 100%, using water as the dispersion medium. Deionized water is preferably used in the present invention.

[0035] The copper-containing trace element water-soluble fertilizer provided by this invention adds seaweed powder with certain chelating function to the copper-containing compound, which promotes the absorption of copper ions by crops and improves the utilization rate of fertilizer. In addition, the copper-containing trace element water-soluble fertilizer also adds dispersants, wetting agents and other excipients, which solves the problem that copper-containing compounds are prone to sedimentation and solidification due to their high density, and helps to extend the shelf life of the product.

[0036] Unless otherwise specified, the present invention does not have any special restrictions on the source of the above-mentioned raw materials, and commercially available raw materials in the art can be used.

[0037] This invention also provides a method for preparing the above-mentioned copper-containing trace element water-soluble fertilizer, comprising the following steps:

[0038] A dispersion A is obtained by mixing and stirring copper-containing compound, seaweed powder, dispersant, wetting agent, and water.

[0039] The dispersion was ground to D. 50 =1~5μm, to obtain dispersion B;

[0040] A thickener was added to the dispersion B, and grinding was continued for 10 minutes to obtain the copper-containing trace element water-soluble fertilizer.

[0041] This invention involves mixing a copper-containing compound, seaweed powder, a dispersant, a wetting agent, and water evenly and stirring thoroughly to obtain dispersion A. This invention does not impose any particular limitation on the order or method of mixing the above raw materials; simply mixing them evenly is sufficient. This invention also does not impose any particular limitation on the stirring method; conventional stirring methods in the art can be used.

[0042] After obtaining dispersion A, the present invention grinds dispersion A to D. 50 =1~5μm, to obtain dispersion B. The grinding method of the present invention preferably includes wet grinding, which can grind the copper-containing compound and the seaweed powder to a smaller particle size, so that the water-soluble fertilizer can achieve greater dispersion and more uniform distribution on the crop surface during use, facilitating crop absorption and utilization. The present invention grinds the dispersion to D... 50 A particle size of 1-5 μm is beneficial for the stability of the fertilizer itself and allows for direct application to crops via foliar spraying. During the grinding process described in this invention, the temperature of the dispersion A is preferably below 30°C, more preferably 25°C. Maintaining this temperature helps to keep the water-soluble fertilizer system stable.

[0043] After obtaining dispersion B, a thickener is added to the ground dispersion, and grinding continues for 10 minutes to obtain the copper-containing trace element water-soluble fertilizer. During the continued grinding, the temperature of dispersion B is preferably below 30°C, more preferably 25°C. Maintaining this temperature helps to keep the water-soluble fertilizer system stable.

[0044] The method for preparing copper-containing trace element water-soluble fertilizer provided by this invention is simple and energy-saving, requires no chelating agent, is green and environmentally friendly, has little harm to the environment, has good application prospects, and is conducive to the sustainable development of agriculture.

[0045] This invention also provides a method for using the copper-containing trace element water-soluble fertilizer described in the above technical solution, which is applied to crops by spraying. In this invention, the preferred spraying dosage of the copper-containing trace element water-soluble fertilizer is 1000 mL / time. The copper-containing trace element water-soluble fertilizer of this invention is stored in liquid fertilizer form, and the median particle size (D) of the fertilizer is reduced by grinding. 50 The thickness is between 1 and 5 μm, and it can be applied by foliar spraying to reduce losses caused by soil absorption.

[0046] This invention also provides the application of the copper-containing composition and copper-containing micronutrient water-soluble fertilizer described in the above-mentioned technical solutions in improving crop yield and / or improving crop quality. In this invention, the crops preferably include tomatoes, citrus fruits, and grapes. The copper-containing micronutrient water-soluble fertilizer provided by this invention has good fertilizer efficacy; when directly sprayed onto crops, it can promote crop growth and increase yield, bringing significant economic benefits.

[0047] To further illustrate the present invention, the copper-containing composition and copper-containing trace element water-soluble fertilizer provided by the present invention are described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0048] Example 1

[0049] A copper-containing composition consisting of 30g of copper chloride and 5g of brown algae powder.

[0050] Example 2

[0051] A copper-containing composition consisting of 30g of basic copper chloride and 5g of red algae powder.

[0052] Example 3

[0053] A copper-containing composition consisting of 30g copper sulfate and 5g red algae powder.

[0054] Example 4

[0055] A copper-containing composition consisting of 30g of copper oxide and 5g of brown algae powder.

[0056] Example 5

[0057] A copper-containing trace element water-soluble fertilizer is composed of the copper-containing composition of Example 1, 5g sodium lignosulfonate, 1g polyoxyethylene polyoxypropylene block copolymer Atlas G-5000, 2g hydroxyethyl cellulose and 57g deionized water.

[0058] The preparation method of the above-mentioned copper-containing trace element water-soluble fertilizer includes the following steps:

[0059] According to the above component ratio, the copper-containing composition (copper chloride, brown algae powder), dispersant (sodium lignosulfonate), wetting agent (polyoxyethylene-polyoxypropylene block copolymer Atlas G-5000), and deionized water are mixed evenly and stirred thoroughly to obtain dispersion A; dispersion A is then ground using a wet grinding method to reach D. 50 =1~5μm, to obtain dispersion B. During grinding, the temperature of dispersion A and dispersion B is controlled at 25℃. Then, a thickener (hydroxyethyl cellulose) is added to dispersion B, and grinding is continued for 10min to obtain copper-containing trace element water-soluble fertilizer.

[0060] Example 6

[0061] A copper-containing trace element water-soluble fertilizer is composed of the copper-containing composition of Example 2, 3g sodium lignosulfonate, 1g polyoxyethylene polyoxypropylene block copolymer Pluronic PE 6100, 2g hydroxyethyl cellulose and 59g deionized water.

[0062] The preparation method of the copper-containing trace element water-soluble fertilizer is the same as in Example 5, except that it is prepared according to the component ratio in Example 6.

[0063] Example 7

[0064] A copper-containing trace element water-soluble fertilizer is composed of the copper-containing composition of Example 3, 4g of calcium lignosulfonate, 1g of polyoxyethylene polyoxypropylene block copolymer Pluronic PE 6300, 2g of hydroxyethyl cellulose and 58g of deionized water.

[0065] The preparation method of the copper-containing trace element water-soluble fertilizer is the same as that in Example 5, except that it is prepared according to the component ratio in Example 7.

[0066] Example 8

[0067] A copper-containing trace element water-soluble fertilizer is composed of the copper-containing composition of Example 4, 4g of calcium lignosulfonate, 1g of polyoxyethylene polyoxypropylene block copolymer Pluronic PE 6300, 2g of hydroxyethyl cellulose and 58g of deionized water.

[0068] The preparation method of the copper-containing trace element water-soluble fertilizer is the same as that in Example 5, except that it is prepared according to the component ratio in Example 8.

[0069] The thermal storage stability of the copper-containing trace element water-soluble fertilizers obtained in Examples 5-8 was tested according to the test method for pesticide suspensions, GB / T 19136-2003, "Test Method for Thermal Storage Stability of Pesticides". Specifically, the samples were sealed and stored in a constant temperature incubator at 54±2℃ for 14 days to observe whether the product showed signs of clumping, paste formation, or good fluidity. The particle size of the samples was analyzed using a Malvern laser particle size analyzer. The samples were diluted 100 times with water and left to stand at room temperature for 30 minutes to observe whether flocculation or agglomeration occurred.

[0070] Table 1. Quality indicators of the trace element water-soluble fertilizers obtained in Examples 5-8

[0071]

[0072] As shown in Table 1, the copper-containing trace element water-soluble fertilizers prepared in Examples 5 to 8 are all liquids with good fluidity, without clumping, paste formation, flocculation, or agglomeration. It can be seen that the copper-containing trace element water-soluble fertilizers provided by the present invention effectively solve the problem of copper compounds being prone to sedimentation and solidification due to their high density.

[0073] Application Example 1

[0074] Field trials of copper-containing water-soluble micronutrient fertilizer on tomatoes

[0075] The copper-containing trace element water-soluble fertilizer prepared in Example 5 was used in a field plot experiment on tomatoes to investigate the effects of the fertilizer on tomato growth, development and yield.

[0076] 1. Test time and location

[0077] Experiment period: March 2020 to July 2020; Experiment location: Shihou Village, Jinjiang Town and Huoxi Village, Xujiadu Town, Shanggao County, Yichun City, Jiangxi Province.

[0078] 2. Materials and Methods

[0079] Test soil

[0080] Shihou Village, Jinjiang Town: Sandy soil, with soil organic matter of 12.3 g / kg, total nitrogen of 1.09 g / kg, available phosphorus (P2O5) of 19.4 mg / kg, available potassium (K2O) of 75 mg / kg, and pH value of 5.12.

[0081] Huoxi Village, Xujiadu Town: Sandy loam soil, with soil organic matter 1.35g / kg, total nitrogen 1.14g / kg, available phosphorus (P2O5) 21.6mg / kg, available potassium (K2O) 68mg / kg, and pH value 5.08.

[0082] Tested variety: Red Prince.

[0083] Experimental Design

[0084] Each of the two experimental sites had three treatments, and each treatment was repeated three times in parallel, for a total of nine plots. The plot area for each treatment was 35m². 2 Each plot contains 60 plants, with an average row spacing of 80cm and a plant spacing of 50cm. The protected greenhouse planting area is 5m wide and 48m long. Treatment 1: Conventional fertilization + water control (represented by CK); Treatment 2: Conventional fertilization + 600mL of micronutrients (copper-containing water-soluble micronutrient fertilizer prepared in Example 5, represented by 600); Treatment 3: Conventional fertilization + 1000mL of micronutrients (copper-containing water-soluble micronutrient fertilizer prepared in Example 5, represented by 1000).

[0085] Test methods

[0086] Conventional fertilization: Apply 5000-7500 kg of high-quality organic fertilizer and 35 kg of superphosphate per mu as base fertilizer. Top-dress three times during the growing season, applying 10 kg of urea and 7.5 kg of compound fertilizer per mu. Treatments 1, 2, and 3 were treated with conventional fertilization, and sprayed at three stages: flower bud differentiation (mid-April), the first swelling stage (mid-May), and the second swelling stage (early June). Treatments 1, 2, and 3 were sprayed with water, 600 mL of micronutrient solution, and 1000 mL of micronutrient solution, respectively, at the above three stages. Field management and agronomic measures were consistent across all plots throughout the experiment.

[0087] Determination methods

[0088] Individual plots were harvested and dried separately, and the yields were weighed. The average value of the values ​​obtained from three parallel experiments for each treatment was taken. The vitamin C content, reducing sugar content, sugar nitrate content, and carotenoid content of tomatoes were tested by the Soil and Fertilizer Station of Shanggao County, Yichun City, Jiangxi Province. The experimental data were analyzed using Excel 2003 and DPS 2000 software.

[0089] 3. Results and Analysis

[0090] The effects of different treatments on tomato quality are shown in Table 2.

[0091] Table 2. Tomato quality indicators under different treatments

[0092]

[0093] Table 2 shows that the fruits treated with copper-containing micronutrient water-soluble fertilizer exhibited significantly improved quality compared to the water control. This improvement was primarily manifested in stronger aroma, greater firmness, sweeter taste, more attractive appearance, and longer storage life. Analysis of various fruit quality indicators indicates that applying micronutrient water-soluble fertilizer to tomatoes increases vitamin C, reducing sugars, and carotene, while simultaneously reducing sugar and nitrate content.

[0094] The effects of different treatments on tomato yield are shown in Tables 3-5.

[0095] Table 3. Effects of different fertilization treatments on tomato yield

[0096]

[0097] Table 4. Analysis of variance on the effect of different fertilization treatments on tomato yield

[0098]

[0099] Note: * indicates a significant difference, ** indicates an extremely significant difference.

[0100] Table 5. Multiple comparisons of the effects of different fertilization treatments on tomato yield.

[0101]

[0102] Table 3 shows that the yield of treatment 3 in Shihou Village, Jinjiang Town, was 7.90% higher than that of treatment 1, and the yield of treatment 3 in Huoxi Village, Xujiadu Town, was 7.01% higher than that of treatment 1. This indicates that the application of copper-containing micronutrient water-soluble fertilizer has a significant promoting effect on yield improvement. The results were statistically significant after analysis of variance (see Tables 4 and 5). The differences between treatments were significant, while the differences between blocks were not obvious.

[0103] 4. Experimental Conclusions

[0104] The copper-containing trace element water-soluble fertilizer prepared in Example 5 has the effects of improving tomato nutrition and fruit quality, and has a significant yield-increasing effect. Among them, treatment 3 in Shihou Village, Jinjiang Town increased tomato yield by 238.67 kg / mu compared with the control, with a yield increase rate of 7.90%, and treatment 3 in Huoxi Village, Xujiadu Town increased tomato yield by 205.67 kg / mu compared with the control, with a yield increase rate of 7.01%.

[0105] Application Example 2

[0106] Field trials of copper-containing micronutrient water-soluble fertilizer on citrus.

[0107] The copper-containing trace element water-soluble fertilizer prepared in Example 6 was used in a field plot experiment on citrus to investigate the effects of the fertilizer on the growth, development and yield of citrus.

[0108] 1. Test time and location

[0109] Experiment period: April 2021 to October 2021; Experiment location: Tianzeyuan Farm, Siquan Village, Moshan Town and Jujing Village, Aoshan Town, Shanggao County, Yichun City, Jiangxi Province.

[0110] 2. Materials and Methods

[0111] Test soil

[0112] Siquan Village, Moshan Town: Soil type: red soil, soil organic matter 12.57g / kg, total nitrogen 1.23g / kg, available phosphorus (P2O5) 13.8mg / kg, available potassium (K2O) 85mg / kg, pH value 5.08.

[0113] Jujing Village, Aoshan Town: Soil type: yellow soil, organic matter 16.78g / kg, total nitrogen 1.17g / kg, available phosphorus (P2O5) 12.4mg / kg, available potassium (K2O) 91mg / kg, pH value 5.12.

[0114] Tested variety: Wenzhou mandarin orange.

[0115] Experimental Design

[0116] Small-plot experimental design: Two experimental sites were set up with 3 treatments each, and each treatment was tested in triplicate, for a total of 9 small plots arranged in a randomized block design. The plot area for each treatment was 100m². 2 (Approximately 25 citrus trees, 7 years old, in their peak production period). Treatment 1: Conventional fertilization + water control (represented by CK); Treatment 2: Conventional fertilization + 600 mL of micronutrient solution (copper-containing water-soluble micronutrient fertilizer prepared in Example 6, represented by 600); Treatment 3: Conventional fertilization + 1000 mL of micronutrient solution (copper-containing water-soluble micronutrient fertilizer prepared in Example 6, represented by 1000).

[0117] Test methods

[0118] Conventional fertilization: Each treatment received 3000 kg of well-rotted high-quality organic fertilizer and 25 kg of 45% NPK compound fertilizer per mu. Treatments 1, 2, and 3 received the same conventional fertilization, with the following additional treatments: spraying once during the young fruit stage of citrus, followed by a second spraying after 15 days, then another spraying after 15 days, and finally a spraying before harvest when the fruit is enlarged. Treatments 1, 2, and 3 were also sprayed with water, 600 mL of micronutrient solution, and 1000 mL of micronutrient solution at the above four stages, respectively. Field management and agronomic measures were consistent across all plots throughout the experiment.

[0119] Determination methods

[0120] Individual plots were harvested and dried separately, and the yield was measured. The average value of the values ​​obtained from three parallel experiments for each treatment was taken. The single fruit weight, sugar content, firmness, and acidity of citrus were measured by the Soil and Fertilizer Work Station of Shanggao County, Yichun City, Jiangxi Province. The experimental data were analyzed using Excel 2003 and DPS 2000 software.

[0121] 3. Results Analysis

[0122] The effects of different treatments on the quality of citrus fruits are shown in Table 6.

[0123] Table 6 Quality indicators of tangerines under different treatments

[0124]

[0125] As shown in Table 6, the quality of fruits treated with copper-containing micronutrient water-soluble fertilizer was significantly improved compared to the water control. The main improvements were a stronger aroma, greater firmness, sweeter taste, more attractive appearance, and longer storage time. The analysis of various fruit quality indicators showed that the application of micronutrient water-soluble fertilizer to citrus fruits could increase the weight of individual fruits, sugar content, and firmness, while reducing acidity.

[0126] The effects of different fertilization treatments on citrus yield are shown in 7-9.

[0127] Table 7. Effects of different fertilization treatments on citrus yield

[0128]

[0129] Table 8. Analysis of variance on the effect of different fertilization treatments on citrus yield

[0130]

[0131] Note: * indicates a significant difference, ** indicates an extremely significant difference.

[0132] Table 9. Multiple comparisons of the effects of different fertilization treatments on citrus yield.

[0133]

[0134] As shown in Table 7, the yield of treatment 3 in Siquan Village, Moshan Town was 6.72% higher than that of treatment 1, and the yield of treatment 3 in Jujing Village, Aoshan Town was 5.75% higher than that of treatment 1. This indicates that the application of micronutrient water-soluble fertilizer has a significant promoting effect on the increase of citrus yield. Statistical analysis results show that the differences between treatments are significant, while the differences between blocks are not obvious (Tables 8 and 9).

[0135] 4. Experimental Conclusions

[0136] The copper-containing trace element water-soluble fertilizer prepared in Example 6 has the effects of providing nutrition to citrus and improving fruit quality, and has a significant yield-increasing effect. Among them, treatment 3 in Siquan Village, Moshan Town increased the citrus yield by 191.66 kg / mu compared with the control, with a yield increase rate of 6.72%, and treatment 3 in Jujing Village, Aoshan Town increased the citrus yield by 161.33 kg / mu compared with the control, with a yield increase rate of 5.75%.

[0137] Application Example 3

[0138] Field trials of micronutrient water-soluble fertilizers on grapes

[0139] The copper-containing trace element water-soluble fertilizer prepared in Example 7 was used in a field plot experiment on grapes to investigate the effects of the fertilizer on grape growth, development and yield.

[0140] 1. Test time and location

[0141] Experiment period: March 2021 to August 2021; Experiment location: Tianzeyuan Farm, Shihou Village, Jinjiang Town and Jujing Village, Aoshan Town, Shanggao County, Yichun City, Jiangxi Province.

[0142] 2. Materials and Methods

[0143] Test soil

[0144] Shihou Village, Jinjiang Town: Soil type: sandy loam; soil organic matter: 28.35 g / kg; total nitrogen: 1.22 g / kg; available phosphorus (P2O5): 25.8 mg / kg; available potassium (K2O): 84 mg / kg; pH value: 4.89.

[0145] Jujing Village, Aoshan Town: Soil type: yellow soil; soil organic matter: 18.75 g / kg; total nitrogen: 1.19 g / kg; available phosphorus (P2O5): 13.5 mg / kg; available potassium (K2O): 86 mg / kg; pH value: 5.27.

[0146] Tested variety: Xiahei.

[0147] Experimental Design

[0148] Small-plot experimental design: Two experimental sites were set up, each with 3 treatments. Each treatment was tested in triplicate, for a total of 9 plots arranged in a randomized block design. The plot area for each treatment was 75m². 2 (Approximately 25 grapevines, 5 years old, in their peak production period). Treatment 1: Conventional fertilization + water control (denoted as CK); Treatment 2: Conventional fertilization + 600 mL of micronutrient solution (copper-containing water-soluble micronutrient fertilizer prepared in Example 7, denoted as 600); Treatment 3: Conventional fertilization + 1000 mL of micronutrient solution (copper-containing water-soluble micronutrient fertilizer prepared in Example 7, denoted as 1000).

[0149] Test methods

[0150] Conventional fertilization: For each treatment, apply 25.5 kg of diammonium phosphate, 15.5 kg of potassium sulfate, 22.5 kg of urea, and 1.5 m³ of well-rotted farmyard manure as base fertilizer per mu (667 square meters). 3Treatments 1, 2, and 3 were treated with the same routine fertilization. The treatments included one root foliar spray during the young fruit stage, followed by a second spray 15 days later, then another spray 15 days later, and a final spray before harvest when the fruit was enlarged. Treatments 1, 2, and 3 were also sprayed with water, 600 mL of micronutrient solution, and 1000 mL of micronutrient solution at the four different stages. Field management and agronomic practices were consistent across all plots throughout the experiment.

[0151] Determination methods

[0152] The yield of each plot was harvested individually, dried, and weighed. The values ​​obtained from three parallel experiments for each treatment were averaged. The average bunch weight, vine thickness, soluble solids content, and single leaf fresh weight of grapes were measured by the Soil and Fertilizer Station of Shanggao County, Yichun City, Jiangxi Province. The experimental data were analyzed using Excel 2003 and DPS 2000 software.

[0153] 3. Results Analysis

[0154] The effects of different treatments on grape quality are shown in Table 10.

[0155] Table 10 Quality characteristics of grapes under different treatments

[0156]

[0157] As shown in Table 10, the application of micronutrient water-soluble fertilizer can improve grape quality, increase the content of soluble solids, improve grape flavor, and make the grape skin thicker, which is more suitable for storage and transportation.

[0158] The effects of different treatments on grape yield are shown in Tables 11-13.

[0159] Table 11 Effects of different fertilization treatments on grape yield

[0160]

[0161] Table 12. Analysis of variance on the effect of different fertilization treatments on grape yield.

[0162]

[0163]

[0164] Note: * indicates a significant difference, ** indicates an extremely significant difference.

[0165] Table 13 Multiple comparisons of the effects of different fertilization treatments on grape yield

[0166]

[0167] As shown in Table 11, the yield of treatment 3 in Shihou Village, Jinjiang Town was 8.60% higher than that of treatment 1, and the yield of treatment 3 in Jujing Village, Aoshan Town was 7.05% higher than that of treatment 1. This indicates that the application of micronutrient water-soluble fertilizer has a significant promoting effect on yield increase. Statistical analysis results show that the differences between treatments are significant, while the differences between blocks are not obvious (see Tables 12 and 13).

[0168] As can be seen from the above embodiments, the copper-containing trace element water-soluble fertilizer provided by the present invention can not only promote the absorption of copper ions by crops and improve fertilizer utilization, but also has good fertilizer effect. It can be directly sprayed on crops, which is beneficial to crop growth and yield increase, and can bring significant economic benefits.

[0169] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and 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 method for preparing a copper-containing trace element water-soluble fertilizer, characterized in that, It is composed of the following components by weight percentage: 30% copper compound, 5% seaweed powder, 3%–5% dispersant, 1% wetting agent, 1%–2% thickener and balance water; The copper-containing compound is copper chloride, basic copper chloride, copper sulfate, or copper oxide; the seaweed powder is brown algae powder and / or red algae powder. The dispersant is lignin sulfonate; The wetting agent is a polyoxyethylene-polyoxypropylene block copolymer; The thickener is cellulose; The preparation method includes the following steps: A dispersion A is obtained by mixing and stirring a copper-containing compound, seaweed powder, dispersant, wetting agent and water. The dispersion A is ground to D. 50 =1~5μm, to obtain dispersion B; A thickener was added to the dispersion B, and grinding was continued for 10 minutes to obtain the copper-containing trace element water-soluble fertilizer.

2. The preparation method according to claim 1, characterized in that, During the grinding process, the temperatures of dispersion A and dispersion B are below 30°C.

3. The method of using the copper-containing trace element water-soluble fertilizer obtained by the preparation method according to claim 1 or 2, characterized in that, It is applied to crops by spraying.

4. The application of the copper-containing trace element water-soluble fertilizer obtained by the preparation method of claim 1 or 2 in improving crop yield and / or crop quality.

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