Water-soluble organic acid calcium bio-fertilizer and preparation method thereof

Abstract

The invention relates to the field of bio-fertilizers, and particularly discloses a water-soluble organic acid calcium bio-fertilizer and a preparation method thereof, and the water-soluble organic acid calcium bio-fertilizer comprises the following preparation raw materials: 98%-99% of a plant mixture containing organic acid calcium and 1%-2% of a diffusant. The preparation method comprises the following steps: S1, preparing the plant extract for later use; s2, crushing calcium powder, adding water, and mixing to prepare calcium-containing paste for later use; s3, mixing the calcium-containing paste with a plant extract in proportion for reaction to prepare a plant mixture containing organic acid calcium; s4, mixing the plant mixture containing the organic acid calcium with a dispersing agent in proportion to obtain the water-soluble organic acid calcium bio-fertilizer. The calcium fertilizer which can be efficiently absorbed by plants and can smoothly run in the plants is prepared.

Description

Technical Field

[0001] The present application relates to the field of biofertilizers, and in particular to a water-soluble organic acid calcium biofertilizer and a preparation method thereof. Background Art

[0002] Traditional calcium fertilizers such as limestone powder and shell powder can improve soil structure, but because they are insoluble in water, it is difficult for plants to absorb and utilize the calcium in them. Soluble calcium fertilizers such as calcium chloride and calcium nitrate can be absorbed by plants, but they do not run smoothly in the plant body and cannot smoothly reach functional organs. In addition, some crops have a huge demand for calcium, and existing calcium fertilizers are difficult to meet their needs. Therefore, how to provide a calcium fertilizer that can be efficiently absorbed by plants and can run smoothly in plants has become a problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of this application is to overcome the above technical problems and provide a water-soluble organic acid calcium biofertilizer and a preparation method thereof.

[0004] In the first aspect, the present application provides a water-soluble organic acid calcium biofertilizer adopts the following technical solution: A water-soluble organic acid calcium biofertilizer comprises raw materials in the following proportions: 98% to 99% of a plant mixture containing organic acid calcium and 1% to 2% of a diffusant; wherein the plant mixture containing organic acid calcium is prepared by reacting a calcium-containing paste and a plant extract, and the weight ratio of the calcium-containing paste to the plant extract is (1 to 2): (3 to 4).

[0005] Through the above technical solution: when preparing the plant mixture containing organic acid calcium, the plant's own acid reacts with the calcium-containing paste to obtain a soluble calcium salt, which is electrolyzed into calcium ions in an aqueous solution and is easily absorbed by the plant. At the same time, the amino acids, sugars, vitamins, etc. contained in the plant itself provide nutrients for plant growth; in addition, the plant's own boron, magnesium and other trace elements and sugars assist the calcium ions to reach the functional organs, improve the utilization rate of calcium ions by the target crops, and achieve the purpose of the fertilizer being efficiently absorbed by the target crops and running smoothly in the target crops.

[0006] Optionally, the calcium-containing paste is a mixture of calcium powder and water, the calcium powder is one or more of shell powder, limestone powder, and slaked lime powder, and the weight ratio of the calcium powder to water is 2:(1-2).

[0007] Through the above technical solution: 90% to 95% of shell powder is calcium carbonate, which is insoluble in water, so the calcium in it cannot be absorbed by plants; limestone and slaked lime also have the above problems; but the above calcium powder reacts with the acid in the plant extract to produce soluble calcium salts, which facilitates the absorption of calcium ions by target crops.

[0008] Optionally, the plant extract is extracted from ginkgo leaves, ginkgo fruits and green manure plants containing organic acids, and the green manure plants containing organic acids are one or more of Sesbania leaf stems, Milkvetch leaf stems, Vetch leaf stems, alfalfa leaf stems, Amorpha fruticosa leaves, Amorpha fruticosa flowers and Amorpha fruticosa fruits.

[0009] According to the above technical scheme: the above plants are all green manure plants, rich in nutrients and organic acids; organic acids react with calcium carbonate or calcium hydroxide to generate organic acid calcium, carbon dioxide and water, or organic acid calcium and water, and organic acid calcium can ionize calcium ions; ginkgo leaves are rich in quinolinic acid, which reacts with calcium carbonate to generate calcium quinolinate. The reaction products of the above plant extracts with shell powder, limestone powder and slaked lime powder are all soluble in water.

[0010] Optionally, the water-soluble organic acid calcium biofertilizer contains 3.2% to 9.7% calcium ions.

[0011] Through the above technical solution: the calcium ion content meets the calcium needs of plants.

[0012] In a second aspect, the present application provides a method for preparing a water-soluble organic acid calcium biofertilizer using the following technical scheme: A method for preparing a water-soluble organic acid calcium biofertilizer comprises the following steps: S1, prepare plant extract for standby use; S2, grinding the calcium powder and adding water to mix to make a calcium-containing paste for standby use; S3, mixing the calcium-containing paste and the plant extract in proportion to react, to obtain a plant mixture containing organic acid calcium; S4. Mix the plant mixture containing organic acid calcium and the diffuser in proportion to obtain water-soluble organic acid calcium biofertilizer.

[0013] Optionally, the steps of preparing the plant extract include drying, crushing, ethanol extraction, filtering, vacuum concentration, water extraction, vacuum concentration again, and detecting the content of plant organic acids, boron, magnesium and sugar alcohols in the plant extract.

[0014] Through the above technical solution: by detecting and controlling the content of organic acid, boron, magnesium and sugar alcohol, it is ensured that the calcium fertilizer can be efficiently absorbed by the plant and can run smoothly in the plant body.

[0015] Optionally, the calcium powder is ground into particles of 23 to 32 microns, and water is added and mixed at a weight ratio of calcium powder to water of 2: (1 to 2) to form a calcium-containing paste.

[0016] Optionally, the calcium-containing paste and the plant extract are mixed in a weight ratio of (1-2): (3-4), stirred and reacted for 2-3 hours, and then filtered to obtain a plant mixture containing organic acid calcium.

[0017] In summary, the present application includes at least one of the following beneficial technical effects: 1. The biological fertilizer prepared in the present application is water-soluble, and calcium is in an ionic state in the aqueous solution, and is easily absorbed by plants whether it is sprayed, flushed, or drip-irrigated.

[0018] 2. Calcium must have sufficient boron, magnesium and other trace elements and sugars to help it move smoothly in the plant body to reach the functional organs. The organic acid used in the biofertilizer involved in this application is an extract extracted from the plant body. It not only contains organic acids, but also contains boron, magnesium and other trace elements and sugar alcohols, so that the calcium content in the plant body is sufficient to assist the movement of calcium.

[0019] 3. The biological fertilizer involved in this application contains 3.2% to 9.7% ion calcium, and has a high calcium ion content, which can meet the calcium needs of plants. DETAILED DESCRIPTION

[0020] The present application is further described in detail below with reference to examples and comparative examples.

[0021] In the following examples, if no specific conditions are specified, the reaction was carried out according to conventional conditions or conditions recommended by the manufacturer. Unless otherwise specified, the raw materials used in the following examples can be obtained from common commercial sources.

[0022] Shells contain 90% to 95% calcium carbonate; limestone contains 80% to 90% calcium carbonate; and the calcium hydroxide content in slaked lime is greater than or equal to 90%.

[0023] Example 1 S1. Preparation of plant extracts: S11. Ginkgo biloba leaves are selected as green manure plants containing organic acids. The leaves are dried and crushed through a 20-mesh sieve. S12, extraction, using 80% ethanol as solvent, a solid-liquid ratio of 1:6, an extraction temperature of 80°C, and an extraction time of 3 hours; S13, filtering the extract with a 100-mesh filter; S14, vacuum concentrating the filtrate into a paste, and recovering ethanol; S15, extracting the paste concentrate with water, retaining the aqueous solution, and removing water-insoluble impurities; S16, vacuum concentrate the aqueous solution to a water content of 10% ± 0.1%; S17. Detect the organic acid content in the product of S16, and obtain quinolinic acid content of 14%, total organic acid content of 16.2%, boron content of 0.03%, magnesium content of 0.09%, and sugar alcohol content of 5.4%, which is a plant extract; S2, grinding calcium powder and adding water to mix to prepare a calcium-containing paste, specifically comprising the following steps: S21, mixing and crushing shells, limestone and slaked lime in a ratio of 1:1:1; grinding with a grinder to obtain calcium powder with a particle size of 27 μm; S22, adding water to the calcium powder in a weight ratio of 2:1 to raw water, stirring evenly to obtain a calcium-containing paste; S3, mixing the calcium-containing paste prepared in S2 with the plant extract prepared in S1 at a ratio of 1:4, reacting at room temperature for 3 hours, stirring continuously during the reaction, to obtain a plant mixture containing organic acid calcium; S4. Take 98 kg of the plant mixture containing organic acid calcium prepared in S3 and mix it with 2 kg of the diffusing agent, and use a conventional mixing process to obtain a water-soluble organic acid calcium biofertilizer.

[0024] Example 2 S1. Preparation of plant extracts: S11. Ginkgo biloba leaves are selected as green manure plants containing organic acids. The leaves are dried and crushed through a 20-mesh sieve. S12, extraction, using 80% ethanol as solvent, a solid-liquid ratio of 1:6, an extraction temperature of 80° C., and an extraction time of 3.5 hours; S13, filtering the extract with a 100-mesh filter; S14, vacuum concentrating the filtrate into a paste, and recovering ethanol; S15, extracting the paste concentrate with water, retaining the aqueous solution, and removing water-insoluble impurities; S16, vacuum concentrate the aqueous solution to a water content of 13% ± 0.1%; S17. Detect the organic acid content in the product of S16, and obtain quinolinic acid content of 15.6%, total organic acid content of 17.2%, boron content of 0.04%, magnesium content of 0.1%, and sugar alcohol content of 6.1%, which is a plant extract; S2, grinding calcium powder and adding water to mix to prepare a calcium-containing paste, specifically comprising the following steps: S21, mixing and crushing shells, limestone and slaked lime in a ratio of 1:1:1; grinding with a grinder to obtain calcium powder with a particle size of 23 μm; S22, adding water to the calcium powder in a weight ratio of 2:1 to raw water, stirring evenly to obtain a calcium-containing paste; S3, mixing the calcium-containing paste prepared in S2 with the plant extract prepared in S1 at a ratio of 1:2, reacting at room temperature for 2.5 hours, stirring continuously during the reaction, to obtain a plant mixture containing organic acid calcium; S4, taking 98 kg of the plant mixture containing organic acid calcium prepared in S3 and 2 kg of the diffusing agent, and using a conventional mixing process to obtain a water-soluble organic acid calcium biofertilizer.

[0025] Example 3 S1. Preparation of plant extracts: S11. Ginkgo biloba leaves are selected as green manure plants containing organic acids. The leaves are dried and crushed through a 20-mesh sieve. S12, extraction, using 80% ethanol as solvent, a solid-liquid ratio of 1:6, an extraction temperature of 80° C., and an extraction time of 4 hours; S13, filtering the extract with a 100-mesh filter; S14, vacuum concentrating the filtrate into a paste, and recovering ethanol; S15, extracting the paste concentrate with water, retaining the aqueous solution, and removing water-insoluble impurities; S16, vacuum concentrate the aqueous solution to a water content of 15% ± 0.1%; S17. Detect the organic acid content in the product of S16, and obtain quinolinic acid content of 13.2%, total organic acid content of 15.6%, boron content of 0.04%, magnesium content of 0.09%, and sugar alcohol content of 5.8%, which is a plant extract; S2, grinding calcium powder and adding water to mix to prepare a calcium-containing paste, specifically comprising the following steps: S21, mixing and crushing shells, limestone and slaked lime in a ratio of 1:1:1; grinding with a grinder to obtain calcium powder with a particle size of 32 μm; S22, adding water to the calcium powder in a weight ratio of 1:1 to raw water, stirring evenly to obtain a calcium-containing paste; S3, mixing the calcium-containing paste prepared in S2 with the plant extract prepared in S1 at a ratio of 2:3, reacting at room temperature for 2 hours, stirring continuously during the reaction, to obtain a plant mixture containing organic acid calcium; S4, taking 99 kg of the plant mixture containing organic acid calcium prepared in S3 and 1 kg of a diffusant, and mixing them, and using a conventional mixing process to obtain a water-soluble organic acid calcium biofertilizer.

[0026] Example 4 The difference between this embodiment and embodiment 2 is that the green manure plant containing organic acid used in S11 is replaced with ginkgo fruit; S17. Detect the organic acid content in the product of S16, and obtain a total organic acid content of 14.2%, boron 0.02%, magnesium 0.04%, and sugar alcohol 3.8%, which is a plant extract.

[0027] Example 5 The difference between this embodiment and embodiment 2 is that: the green manure plants containing organic acid used in S11 are replaced with Amorpha fruticosa leaves and Amorpha fruticosa fruits, and the weight ratio of Amorpha fruticosa leaves to Amorpha fruticosa fruits is 1:1;

[0028] S17. Detect the organic acid content in the product of S16, and obtain a total organic acid content of 11.2%, boron 0.02%, magnesium 0.04%, and sugar alcohol 3.8%, which is a plant extract.

[0029] Example 6 The difference between this embodiment and embodiment 2 is that: the green manure plant containing organic acid used in S11 is replaced with sesbania leaf stems;

[0030] S17. Detect the organic acid content in the product of S16, and obtain a total organic acid content of 10.1%, boron 0.02%, magnesium 0.03%, and sugar alcohol 4.2%, which is a plant extract.

[0031] Example 7 The difference between this embodiment and embodiment 2 is that: the green manure plant containing organic acid used in S11 is replaced with the leaf stem of Astragalus membranaceus;

[0032] S17. Detect the organic acid content in the product of S16, and obtain a total organic acid content of 10.7%, boron 0.02%, magnesium 0.04%, and sugar alcohol 5.8%, which is a plant extract.

[0033] Example 8 The difference between this embodiment and embodiment 2 is that the green manure plant containing organic acid used in S11 is replaced with vetch leaf stems;

[0034] S17. Detect the organic acid content in the product of S16, and obtain a total organic acid content of 11.2%, boron 0.01%, magnesium 0.03%, and sugar alcohol 5.3%, which is a plant extract.

[0035] Example 9 The difference between this embodiment and embodiment 2 is that the green manure plant containing organic acid used in S11 is replaced with alfalfa leaf stalks;

[0036] S17. Detect the organic acid content in the product of S16, and obtain a total organic acid content of 10.6%, boron 0.03%, magnesium 0.02%, and sugar alcohol 4.2%, which is a plant extract.

[0037] Embodiment 110 The difference between this embodiment and embodiment 2 is that: the green manure plant containing organic acid used in S11 is replaced with a mixture of ginkgo fruit, Amorpha fruticosa leaf and Amorpha fruticosa fruit, and the weight ratio of ginkgo fruit, Amorpha fruticosa fruit and Amorpha fruticosa leaf is 5:5:2;

[0038] S17. Detect the organic acid content in the product of S16, and obtain a total organic acid content of 13.97%; boron 0.04%; magnesium 0.08%; sugar 3.2%, which is a plant extract.

[0039] Embodiment 11 The difference between this embodiment and embodiment 2 is that: S21, crush the shells; grind them with a grinder to make the particles 23 μm, and obtain calcium powder.

[0040] Example 12 The difference between this embodiment and embodiment 2 is that: S21, crushing the limestone; grinding it with a grinder to make its particles 23 μm, and obtaining calcium powder.

[0041] Embodiment 13 The difference between this embodiment and embodiment 2 is that: S21, crushing slaked lime; grinding it with a grinder to make its particles 23 μm, and obtaining calcium powder.

[0042] Comparative Example 1 The difference between this comparative example and Example 2 is that the green manure plant containing organic acid is replaced with quinolinic acid, and the specific steps are as follows: S1. Prepare quinolinic acid and set aside; S2, crushing the calcium powder and adding water to mix to prepare a calcium-containing paste, specifically comprising the following steps: S21, mixing and crushing shells, limestone and slaked lime in a ratio of 1:1:1; grinding with a grinder to obtain calcium powder with a particle size of 23 μm; S22, adding water to the powder in a weight ratio of calcium powder to raw material water of 2:1, stirring evenly to obtain a calcium-containing paste; S3, mixing the calcium-containing paste prepared in S2 and the quinolinic acid prepared in S1 at a ratio of 1:2 and reacting at room temperature for 2.5 hours, stirring during the reaction, to obtain a plant mixture containing organic acid calcium; S4, taking 98 kg of the plant mixture containing organic acid calcium prepared in S3 and 2 kg of the diffusing agent, and using a conventional mixing process to obtain a water-soluble organic acid calcium biofertilizer.

[0043] Comparative Example 2 The difference between this comparative example and Example 2 is that the calcium powder is replaced with calcium chloride. The specific steps are: S1. Preparation of plant extracts: S11. Ginkgo biloba leaves are selected as green manure plants containing organic acids. The leaves are dried and crushed through a 20-mesh sieve. S12, extraction, using 80% ethanol as solvent, a solid-liquid ratio of 1:6, an extraction temperature of 80°C, and an extraction time of 3 hours; S13, filtering the extract with a 100-mesh filter; S14, vacuum concentrating the filtrate into a paste, and recovering ethanol; S15, extracting the paste concentrate with water, retaining the aqueous solution, and removing water-insoluble impurities; S16, vacuum concentrate the aqueous solution to a water content of 5% ± 0.1%; S17. Detect the organic acid content in the product of S16, and obtain quinolinic acid content of 15.6%, total organic acid content of 17.2%, boron content of 0.04%, magnesium content of 0.1%, and sugar alcohol content of 6.1%, which is a plant extract; S2, grinding calcium powder and adding water to mix to prepare a calcium-containing paste, specifically comprising the following steps: S21, crushing calcium chloride; grinding it with a grinder to make its particles 23 μm, to obtain calcium powder; S22, adding water to the powder in a weight ratio of calcium powder to raw material water of 2:1, stirring evenly to obtain a calcium-containing paste; S3, mixing the calcium-containing paste prepared in S2 with the plant extract prepared in S1 at a ratio of 1:2, reacting at room temperature for 2.5 hours, stirring continuously during the reaction, to obtain a plant mixture containing organic acid calcium; S4, taking 75 kg of the plant mixture containing organic acid calcium prepared in S3, 2 kg of the diffusant and 23 kg of distilled water and mixing them, and using a conventional mixing process to obtain a water-soluble organic acid calcium biofertilizer.

[0044] Comparative Example 3 The difference between this comparative example and Example 2 is that 98 kg of conventional calcium chloride liquid fertilizer and 2 kg of diffusing agent are mixed, wherein the calcium fertilizer does not contain boron, magnesium and sugar alcohol, and the fertilizer is obtained using a conventional mixing process.

[0045] Comparative Example 4 The difference between this comparative example and Example 2 is that 98 kg of calcium chloride liquid fertilizer and 2 kg of diffusant are mixed, wherein the calcium chloride liquid fertilizer contains 0.04% of boron, 0.1% of magnesium and 6.1% of sugar alcohol, and a conventional mixing process is used to obtain fertilizer.

[0046] Performance testing The calcium content in the fertilizers prepared in the implementation and comparative examples was detected using conventional technical means in the art. The experimental results are shown in Table 1.

[0047] Table 1 Calcium ion content test results in various embodiments and comparative examples Calcium ion content / % Calcium ion content% Example 1 3.82 Example 10 5.34 Example 2 8.04 Embodiment 11 6.67 Example 3 7.95 Example 12 7.52 Example 4 6.84 Embodiment 13 9.70 Example 5 3.94 Comparative Example 1 8.22 Example 6 6.10 Comparative Example 2 13.60 Example 7 3.20 Comparative Example 3 28.40 Example 8 4.58 Comparative Example 4 26.7 Example 9 5.94 / / It can be seen from Example 2 and Example 4 and Table 1 that the calcium ion content of the fertilizer prepared using ginkgo leaves is higher than that of the fertilizer prepared using ginkgo fruits.

[0048] It can be seen from Example 2, Example 5 to Example 10 and Table 1 that the calcium ion content in the fertilizer prepared from Ginkgo biloba leaves is higher than the calcium ion content in the fertilizer prepared from Sesbania sesbania leaf stems, Chinese milk vetch leaf stems, potato leaf stems, alfalfa leaf stems, Amorpha fruticosa leaves, Amorpha fruticosa flowers, and Amorpha fruticosa fruits.

[0049] In combination with Example 2, Example 11 to Example 13, and Table 1, it can be seen that the calcium content of the fertilizer prepared using slaked lime alone is higher than the calcium ion content of the fertilizer prepared using shell powder, limestone powder, and a mixture of shell powder, limestone powder and slaked lime powder.

[0050] Combining Example 2 and Comparative Example 1 with Table 1, it can be seen that the calcium ion content in the fertilizer is reduced compared to the preparation and use of quinolinic acid alone instead of the plant extract.

[0051] Combining Example 2 and Comparative Example 2 with Table 1, it can be seen that calcium chloride dissolves in water to form significantly more calcium ions than the calcium ions generated by the reaction of shell powder and the acid in the plant extract.

[0052] It can be seen from Example 2, Comparative Example 3 and Comparative Example 4 and Table 1 that compared with conventional calcium chloride liquid fertilizer, the fertilizer prepared in the present application has a lower calcium ion content.

[0053] Experiments show that the particle sizes of the precipitates in Examples 1 to 10 are all no greater than 30 μm, and the main component detected is pearl powder, with a content of 0.5% to 1%.

[0054] The fertilizer was used in a tomato vegetable field for field trials. The field test conditions were as follows: Referring to "NY / T497-2002 Technical Specifications for Field Tests on Fertilizer Effect Identification", the fertilizers prepared in the embodiments and comparative examples were applied to tomatoes in calcium-poor soil to detect the growth of tomatoes. The test parameters are as follows: 1. Experimental crops: tomato; Basic physical and chemical properties of soil: total nitrogen 0.7g / kg, organic matter 5.83g / kg, alkaline nitrogen 14.343mg / kg, phosphorus 5.49mg / kg, potassium 144.85mg / kg, average exchangeable calcium 4.2g / kg, salt 2.92g / kg, pH 6.11, 0-20cm soil is mainly fine sand and silt, and the proportion of microaggregates with a particle size of less than 0.25mm is 82.16%; 2. Area of ​​each plot: 20m2; spacing between tomatoes is 35cm; Three experimental plots were set in each embodiment or comparative example. The plots were randomly arranged, and different fertilizers were applied to adjacent plots. An isolation zone was set between each plot.

[0055] 3. Test time First fertilization: Fertilization began on the 10th day after tomato transplanting and planting. The fertilizer prepared in the embodiment or comparative example was diluted with water and sprayed, and the water concentration was 300 times; Second fertilization: fertilization during the tomato flowering period, the fertilizer prepared in the embodiment or comparative example is diluted with water and sprayed, and the water concentration is 300 times.

[0056] 4. Control group: spray with clean water;

[0057] 5. Test results: On the 7th day after the first fertilization, five tomato plants were selected from each plot using the five-point test method to measure and calculate the stem diameter (mm) of the tomato plants. The diameter measurement point was the maximum diameter of the tomato plant. The plots with the same fertilizer were weighed and calculated together, and the final result was averaged. Using the five-point test method, 5 tomato plants were selected from each plot to calculate the tomato yield (kg / plant). The plots with the same fertilizer were combined for weighing and calculation, and the final result was averaged; Using the five-point test method, 5 tomato plants were selected from each plot to calculate the tomato abnormal fruit rate (%): Tomato abnormal fruit rate (%) = (weight of abnormal fruit in the tested tomatoes) / (total weight of the tested tomatoes) The evaluation criteria for heterosexual fruit are: oval, eccentric, pointed, chrysanthemum, finger-shaped and split, which are significantly different from the normal round fruit shape. The plots with the same fertilizer are combined and weighed and calculated, and the final result is the average value; The test results are shown in Table 2.

[0058] Table 2 Field test results of various embodiments and comparative examples Stem diameter / mm <![CDATA[Tomato yield / (kg per plant -1 )]]> Tomato fruit abnormality rate / % Example 1 8.4 16.8 9.54 Example 2 13.7 18.0 7.83 Example 3 10.1 17.3 8.66 Example 4 9.4 15.1 14.70 Example 5 8.3 14.6 14.58 Example 6 9.7 14.2 15.11 Example 7 7.8 13.4 15.50 Example 8 8.1 14.3 16.30 Example 9 8.9 14.5 16.99 Example 10 8.7 14.8 14.52 Embodiment 11 12.5 18.2 7.79 Example 12 13.2 16.6 8.96 Embodiment 13 14.2 17.8 8.33 Comparative Example 1 7.2 9.8 19.50 Comparative Example 2 8.0 6.4 22.31 Comparative Example 3 8.2 5.8 36.20 Comparative Example 4 9.6 11.4 20.47 Control group 2.2 3.6 45.2 Combining Example 2, Example 4 to Example 10 and Table 1 and Table 2, it can be seen that after the fertilizer prepared in Example 2 is applied, the diameter of the tomato plant, the yield of tomatoes and the quality of tomatoes are greatly improved. Although the leaf stems of Sesbania sessica, the leaf stems of Astragalus sinensis, the leaf stems of Vetch cotyledon, the leaf stems of alfalfa, the ginkgo fruit, the leaves of Amorpha fruticosa, the flowers of Amorpha fruticosa and the fruits of Amorpha fruticosa all contain acid, the above plants do not contain or contain less quinolinic acid. It can be seen that the plant mixture containing organic acid calcium prepared by reacting the plant extract prepared from the ginkgo leaf containing quinolinic acid with the calcium paste is more conducive to being efficiently absorbed by the plant and can run smoothly in the plant body.

[0059] It can be seen from Example 2, Example 11 to Example 13 and Table 1 and Table 2 that although the calcium fertilizer prepared from slaked lime has a high calcium ion content, the calcium fertilizer prepared in Example 12 is not the best for the quality and product of tomatoes.

[0060] Combining Example 2 and Comparative Example 1 and Tables 1 and 2, it can be seen that the use of quinolinic acid alone can increase the calcium ion content in the fertilizer, but because there is no effect of substances such as boron, magnesium, and sugar alcohol, calcium ions are not easily transported in the plant body, resulting in a decrease in tomato yield and quality.

[0061] Combining Example 2 and Comparative Example 2 and Tables 1 and 2, it can be seen that the calcium chloride in the calcium chloride liquid fertilizer is not easily absorbed and transported by tomatoes due to the lack of substances such as boron, magnesium, and sugar alcohol in the plant extract, resulting in a decrease in tomato yield and quality.

[0062] It can be seen from Example 2 and Comparative Example 2 and from Tables 1 and 2 that the calcium fertilizer prepared in the present application effectively improves the yield and quality of tomatoes due to the selection of calcium powder, the preparation of plant extracts, and the synergistic effect of calcium powder and plant extracts.

[0063] It can be seen from Example 2, Comparative Example 2 and Comparative Example 4 and Table 1 and Table 2 that, compared with conventional calcium chloride liquid fertilizer that does not contain boron, magnesium and sugar alcohol, the biological fertilizer prepared in the present application has an objective effect on increasing the diameter of tomato plants, tomato yield, and reducing the tomato fruiting rate.

[0064] Combining Example 2, Comparative Example 2 and Comparative Example 4 with Tables 1 and 2, it can be seen that the lack of the plant extract of the present application, even if boron, magnesium and sugar alcohol are supplemented in the conventional calcium chloride liquid fertilizer, has no obvious effect on improving the tomato plant diameter, tomato yield and quality.

[0065] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A water-soluble organic acid calcium biological fertilizer, characterized in that: The preparation raw materials include the following proportions: 98% to 99% of a plant mixture containing organic acid calcium and 1% to 2% of a diffusing agent; wherein the plant mixture containing organic acid calcium is prepared by reacting a calcium-containing paste and a plant extract, and the weight ratio of the calcium-containing paste to the plant extract is (1 to 2): (3 to 4).

2. The water-soluble organic acid calcium biological fertilizer according to claim 1, characterized in that: The calcium-containing paste is a mixture of calcium powder and water, wherein the calcium powder is one or more of shell powder, limestone powder, and slaked lime powder, and the weight ratio of the calcium powder to water is 2:(1-2).

3. The water-soluble organic acid calcium biological fertilizer according to claim 2, characterized in that: The plant extract is obtained by extracting green manure plants containing organic acids, and the green manure plants containing organic acids are one or more of sesbania leaf stems, astragalus leaf stems, vetch leaf stems, alfalfa leaf stems, ginkgo leaves, ginkgo fruits, Amorpha fruticosa leaves, Amorpha fruticosa flowers, and Amorpha fruticosa fruits.

4. The water-soluble organic acid calcium biological fertilizer according to claim 1, characterized in that: The water-soluble organic acid calcium biological fertilizer contains 3.2% to 9.7% calcium ions.

5. A method for preparing a water-soluble organic acid calcium biofertilizer, characterized in that: The following steps are involved: S1, prepare plant extract for standby use; S2, grinding the calcium powder and adding water to mix to make a calcium-containing paste for standby use; S3, mixing the calcium-containing paste and the plant extract in proportion to react, to obtain a plant mixture containing organic acid calcium; S4. Mix the plant mixture containing organic acid calcium and the diffuser in proportion to obtain water-soluble organic acid calcium biofertilizer.

6. The method for preparing the water-soluble organic acid calcium biofertilizer according to claim 5, characterized in that: The steps of preparing the plant extract in S1 include sun drying, crushing, ethanol extraction, filtration, vacuum concentration, water extraction, vacuum concentration again, and detecting the content of plant organic acids, boron, magnesium and sugar alcohol in the product.

7. The method for preparing the water-soluble organic acid calcium biofertilizer according to claim 5, characterized in that: The specific steps of S2 are: grinding calcium powder into particles of 23-32 μm, and adding water to mix the particles according to a weight ratio of calcium powder to water of 2: (1-2) to form a calcium-containing paste.

8. The method for preparing the water-soluble organic acid calcium biofertilizer according to claim 5, characterized in that: The calcium-containing paste and the plant extract are mixed in a weight ratio of (1-2): (3-4), stirred and reacted for 2-3 hours, and then filtered to obtain a plant mixture containing organic acid calcium.