Plant growth promoter for citrus tree growth and preparation method thereof

Abstract

The invention belongs to the technical field of plant growth agents for citrus tree growth, and particularly relates to a plant growth agent for citrus tree growth and a preparation method thereof.The plant growth agent is prepared from, by weight, 2.1-10.1 parts of benayl aminopurine, 2-5 parts of boric acid, 8-18 parts of anhydrous citric acid, 4-40 parts of solvent, 26.9-62.9 parts of deionized water and 1-6 parts of synergistic additive. The fruit preservative is high in solubility, convenient to absorb by fruit trees, and capable of improving the fruit quality and increasing the fruit yield.

Description

Technical Field

[0001] The invention belongs to the technical field of plant growth agents for citrus tree growth, and particularly relates to a plant growth agent for citrus tree growth and a preparation method thereof. Background Art

[0002] Plant growth regulators are a class of artificially synthesized organic substances that can regulate plant growth and development. Plant growth regulators are mainly divided into auxins, gibberellins, cytokinins, and ethylenes. Among them, auxins are regulators mainly composed of indoleacetic acid (IAA), naphthaleneacetic acid (NAA), and 2,4-dichlorophenoxyacetic acid (2,4-D). However, auxin-based plant growth regulators for citrus tree growth can cause symptoms such as burning, curling, and deformities in tissues such as leaves and stem tips at high concentrations, especially in young and tender tissues; gibberellins are regulators mainly composed of gibberellic acid (GA3). Excessive use can lead to accelerated plant growth, slender stems, larger leaves, abnormal plant morphology, and even lodging. It can also cause leaves to curl, twist, and other deformities, affecting the normal photosynthesis of plants. Ethylene-based regulators are mainly composed of ethephon and vinyl silicon, but ethephon is highly irritating. Direct skin contact may cause irritation and dermatitis, and inhalation of ethephon vapor may cause respiratory irritation and discomfort. Abscisic acid-based plant growth agents used for citrus tree growth are also toxic to a certain extent. Long-term or excessive use can easily lead to pesticide residues. Cytokinins are mainly composed of 6-benzylaminopurine (6-BA). Benzylaminopurine itself is poorly soluble in water and has a very low solubility in water. Without the addition of other solvents and co-solvents, it is difficult to use it directly in aqueous preparations. Benzylaminopurine that is not absorbed by plants may enter the soil and water bodies through leaching, destroying the microbial community structure and affecting soil fertility. Therefore, the existing technology needs further improvement. Summary of the Invention

[0003] The purpose of the present invention is to provide a plant growth agent for citrus tree growth, which has high solubility, is easy to be absorbed by fruit trees, can improve fruit quality and increase fruit yield, and a preparation method thereof.

[0004] Based on the above objectives, the present invention adopts the following technical solutions:

[0005] A plant growth agent for growing citrus trees is composed of the following parts by weight: 2.1-10.1 parts of benzylaminopurine, 2-5 parts of boric acid, 8-18 parts of anhydrous citric acid, 4-40 parts of a solvent, 26.9-62.9 parts of deionized water, and 1-6 parts of a synergist.

[0006] Furthermore, the solvent is at least one of methanol, ethanol, propylene glycol, ethylene glycol, dimethyl sulfoxide, N,N-dimethylformamide, N-methylpyrrolidone, tetrahydrofurfuryl alcohol, and water.

[0007] Furthermore, the synergist is at least one of alkyl glycosides, fatty alcohol polyoxyethylene ethers, block polyethers, and Tween-type nonionic surfactants.

[0008] Furthermore, it is composed of the following parts by weight: 2.1 grams of benzylaminopurine, 2 grams of boric acid, 8 grams of anhydrous citric acid, 4 grams of propylene glycol, 20 grams of methanol, and 55.9 grams of deionized water. After mixing the above materials, 6 grams of fatty alcohol polyoxyethylene ether and 2 grams of block polyether are stirred.

[0009] Furthermore, it is composed of the following parts by weight: 5.1 grams of benzylaminopurine, 4 grams of boric acid, 16 grams of anhydrous citric acid, 20 grams of methanol, 46.9 grams of deionized water, 6 grams of fatty alcohol polyoxyethylene ether, and 2 grams of block polyether.

[0010] Furthermore, it is composed of the following parts by weight: 10.1 grams of benzylaminopurine, 5 grams of boric acid, 18 grams of anhydrous citric acid, 10 grams of propylene glycol, 4 grams of lactic acid, 50.9 grams of deionized water, 1 gram of fatty alcohol polyoxyethylene ether, and 1 gram of block polyether.

[0011] A method for preparing the plant growth agent for citrus tree growth is prepared by the following steps: mixing benzylaminopurine, boric acid, anhydrous citric acid, a solvent, and deionized water until completely transparent, and then adding a synergist and stirring evenly.

[0012] The plant growth agent of the present invention combines citric acid and the amino group of benzylaminopurine. Citric acid is used as an organic acid to reduce the pH value of the solution, thereby promoting the protonation of the amino group (-NH2) of benzylaminopurine (generating -NH 3+ ), significantly enhancing the molecular polarity, thereby improving compatibility with water. The carboxylic acid group (-COOH) and hydroxyl group (-OH) of citric acid can also form hydrogen bonds with the amino group of benzylaminopurine or the nitrogen atom on the purine ring, weakening the intermolecular force and reducing aggregation. The citrate ion (C6H5O7 3 -) can increase the ionic strength of the solution, inhibit the precipitation of solute molecules through the "salt effect", and indirectly improve the solubility.

[0013] The plant growth agent for citrus tree growth of the present invention also adds boric acid. Boric acid (H3BO3) as an electron-deficient Lewis acid can form a planar or tetrahedral complex with the electron-rich amino group or purine ring in the benzylaminopurine molecule, thereby changing the surface charge distribution of the solute molecule and enhancing water solubility. In addition, in an acidic solution, the boric acid partially dissociates to generate B(OH) 4-, and works together with anions such as citrate to reduce the repulsive force between solute molecules through electrostatic shielding, thereby promoting dispersion. In the present invention, after boric acid and citric acid are mixed, a composite acidic solvent system is formed, which not only enhances the solute polarity through protonation, but also destroys the aggregation of hydrophobic groups through complexation, achieving synergistic solubilization. The strong acidity of citric acid dominates the protonation process, while the complexation of boric acid further stabilizes the solute molecules. The combination of the two can simultaneously enhance polarity and dispersibility. In addition, the present invention also supplements boron. After use, the present invention not only promotes the growth of citrus trees, but also improves fruit quality and increases fruit yield. DETAILED DESCRIPTION

[0014] Example 1:

[0015] A plant growth agent for growing citrus trees is composed of the following components by weight: 2.1 grams of benzylaminopurine, 2 grams of boric acid, 8 grams of anhydrous citric acid, 4 grams of propylene glycol, 20 grams of methanol, and 55.9 grams of deionized water. The above materials are mixed and then stirred with 6 grams of fatty alcohol polyoxyethylene ether and 2 grams of block polyether.

[0016] The method for preparing the plant growth agent for citrus tree growth comprises the following steps: mixing benzylaminopurine, boric acid, anhydrous citric acid, a solvent and deionized water and stirring until completely transparent, then adding a synergist and stirring evenly to obtain the plant growth agent for citrus tree growth.

[0017] Example 2:

[0018] A plant growth agent for citrus tree growth is composed of the following components by weight: 5.1 grams of benzylaminopurine, 4 grams of boric acid, 16 grams of anhydrous citric acid, 20 grams of methanol, 46.9 grams of deionized water, 6 grams of fatty alcohol polyoxyethylene ether, and 2 grams of block polyether. The plant growth agent is prepared by the following steps: benzylaminopurine, boric acid, anhydrous citric acid, a solvent, and deionized water are mixed and stirred until completely transparent, and then a synergist is added and stirred evenly to obtain the plant growth agent for citrus tree growth.

[0019] Example 3:

[0020] A plant growth agent for growing citrus trees is composed of the following components in parts by weight: 10.1 grams of benzylaminopurine, 5 grams of boric acid, 18 grams of anhydrous citric acid, 10 grams of propylene glycol, 4 grams of lactic acid, 62.9 grams of deionized water, 1 gram of fatty alcohol polyoxyethylene ether, and 1 gram of block polyether.

[0021] The method for preparing the plant growth agent for citrus tree growth comprises the following steps: mixing benzylaminopurine, boric acid, anhydrous citric acid, a solvent and deionized water and stirring until completely transparent, then adding a synergist and stirring evenly to obtain the plant growth agent for citrus tree growth.

[0022] Example 4:

[0023] A plant growth agent for growing citrus trees is composed of the following components by weight: 2.1 grams of benzylaminopurine, 2 grams of boric acid, 8 grams of anhydrous citric acid, 4 grams of propylene glycol, 20 grams of methanol, and 26.9 grams of deionized water. The above materials are mixed and then stirred with 6 grams of fatty alcohol polyoxyethylene ether and 2 grams of block polyether.

[0024] Test Example 1:

[0025] The plant growth agents for citrus tree growth prepared in Examples 1, 2, 3, and 4 of the present invention were tested for their stability at different temperatures. The low-temperature stability was tested according to the GB / T19137-2003 method; the heat storage stability was tested according to the GB / T19136-2021 method. The above test groups were placed at 0°C and 54°C for 7 days, respectively.

[0026]

[0027] As can be seen from the above, the plant growth agent prepared by the present invention meets the standards of pesticide products, has good stability at high temperatures, and has a uniform texture and is free of impurities after dilution.

[0028] Test Example 2:

[0029] Comparative groups were set up. Comparative Group 1: 1g of benzylaminopurine was mixed with 100g of deionized water; Example 1 Group: The plant growth agent for citrus tree growth in Example 1 was mixed with 44.1g of deionized water. Example 2 Group: The plant growth agent for citrus tree growth in Example 2 was mixed with 53.1g of deionized water. Example 3 Group: The plant growth agent for citrus tree growth in Example 3 was mixed with 37.1g of deionized water. The stirring speed was 200rpm, the stirring time was 5min, and the temperature was 25°C. The results were observed to see if the agent could be fully dissolved. The results are shown in Table 1 below:

[0030] Are there any insoluble particles? Comparison group 1 There are a lot of undissolved particles Example 1 Completely dissolved Example 2 Completely dissolved Example 3 Completely dissolved Example 4 Completely dissolved

[0031] As can be seen from the above, the plant growth agent prepared by the present invention has good solubility and can be dissolved quickly.

[0032] Test Example 3:

[0033] The plant growth agents of Examples 1 and 2 of the present invention were used to spray citrus trees (variety Aili 38) respectively. The citrus trees were all 10 years old, and each plant used 1 L of water, for a total of 60 plants. When used, the growth agent was diluted 500 times, 750 times, 1000 times, 1500 times, and 2000 times, respectively. The effective ingredient (mg / kg), fruit setting regulation rate (%), fruit transverse diameter regulation rate (%), fruit longitudinal diameter regulation rate (%), single fruit weight increase rate (%), and yield increase rate (%) were then observed during use. The above data were calculated according to the test methods in the "Quality Management Standards for Pesticide Registration Tests", "Guidelines for Pesticide Field Efficacy Tests" GB / T17980.145-2004, and SOP-TM-077a "Citrus Growth Regulation Test". 20 fruits were sampled per plant during the calculation, and the single fruit weight was the average value of the number of fruits per plant.

[0034] Suitable application period and dosage: Use 10g of the plant growth agent in the embodiment of the present invention to promote the growth of citrus trees (per plant), apply the drug once after the citrus flowers fall and before the second physiological fruit drop, for a total of 2 applications, focusing on spraying flowers and fruits.

[0035] Actual application: The first application took place on May 9, 2019, after the citrus flowers had fallen. The second application took place on May 22, 2019, before the second physiological fruit drop, for a total of two applications. Soil conditions were observed and found to be yellow loam with a pH of 5.6 and an organic matter content of approximately 1.75%.

[0036] Example 1

[0037]

[0038] Example 2

[0039]

[0040] As can be seen from the above, the plant growth agent prepared by the present invention has a significantly improved yield increase rate after use, and the yield increase rate is the best after being diluted 750 times with water.

[0041] Test Example 3:

[0042] Using the fruits produced after Example 2, citrus trees A, B, C, D, E, and F were respectively taken to measure the growth quality of the citrus trees. The soluble sugar, VC content per 100 g, the percentage of VC content in the citrus fruit to the total weight of the fruit, and the weight of a single fruit were all average values ​​after sampling. The number of sampled fruits was 30 per tree, as shown below:

[0043] deal with Soluble sugar (%) VC (mg / 100g) VC (%) Single fruit weight (g) Yield per plant (kg) A 10.37 50.72 0.81 248.0 42.2 B 12.54 46.03 0.98 244.9 38.6 C 15.42 37.17 0.92 248.3 38.9 D 18.68 43.26 0.9 247.4 40.7 E 15.35 49.49 0.94 243.6 39.2 F 13.31 51.49 1.02 228.5 43.8

[0044] As can be seen from the above, after using the plant growth agent of the present invention, the quality of the fruit is better and the yield is higher.

Claims

1. A plant growth agent for citrus tree growth, characterized in that: The invention is composed of the following parts by weight: 2.1-10.1 parts of benzylaminopurine, 2-5 parts of boric acid, 8-18 parts of anhydrous citric acid, 4-40 parts of solvent, 26.9-62.9 parts of deionized water and 1-6 parts of synergist.

2. The plant growth agent for citrus tree growth according to claim 1, characterized in that The solvent is at least one of methanol, ethanol, propylene glycol, ethylene glycol, dimethyl sulfoxide, N,N-dimethylformamide, N-methylpyrrolidone, tetrahydrofurfuryl alcohol and water.

3. The plant growth agent for citrus tree growth according to claim 2, characterized in that: The synergistic aid is at least one of alkyl glycosides, fatty alcohol polyoxyethylene ether, block polyether and Tween nonionic surfactants.

4. The plant growth agent for citrus tree growth according to claim 1, characterized in that The preparation method is composed of the following parts by weight: 2.1 g of benzylaminopurine, 2 g of boric acid, 8 g of anhydrous citric acid, 4 g of propylene glycol, 20 g of methanol, and 55.9 g of deionized water. After mixing the above materials, 6 g of fatty alcohol polyoxyethylene ether and 2 g of block polyether are stirred.

5. The plant growth agent for citrus tree growth according to claim 1, characterized in that: The invention is composed of the following parts by weight: 5.1 g of benzylaminopurine, 4 g of boric acid, 16 g of anhydrous citric acid, 20 g of methanol, 46.9 g of deionized water, 6 g of fatty alcohol polyoxyethylene ether, and 2 g of block polyether.

6. The plant growth agent for citrus tree growth according to claim 1, characterized in that The invention is composed of the following parts by weight: 10.1 g of benzylaminopurine, 5 g of boric acid, 18 g of anhydrous citric acid, 10 g of propylene glycol, 4 g of lactic acid, 50.9 g of deionized water, 1 g of fatty alcohol polyoxyethylene ether, and 1 g of block polyether.

7. A method for preparing the plant growth agent for citrus tree growth according to claim 1, characterized in that: The preparation method is prepared by the following steps: benzylaminopurine, boric acid, anhydrous citric acid, solvent and deionized water are mixed and stirred until completely transparent, and then a synergistic auxiliary agent is added and stirred evenly.

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