A flower thinning agent and its application method

Abstract

This invention belongs to the field of fruit tree cultivation and relates to a flower thinning agent and its application method. The flower thinning agent comprises 6-benzylaminopurine, naphthaleneacetic acid, and a growth regulator; the growth regulator comprises one or more of brassinolide, gibberellin, indolebutyric acid, chlorobenzyl urea, triacontanol, aminoethyl ester, 2,4D, and ethephon. This invention also provides a flower thinning agent containing calcium formate or 5-ALA, which further contains one or both of ethephon and naphthaleneacetic acid. Both flower thinning agents can achieve good flower thinning effects with a single application, resulting in a single fruit rate as high as 50-85%; alternatively, when 20-30% of the central flowers are open, a flower thinning agent containing 6-benzylaminopurine and naphthaleneacetic acid can be sprayed first, followed by a flower thinning agent containing calcium formate or 5-ALA 1-2 days later, to obtain an extremely high single fruit rate. In practical applications, the choice can be made according to the needs of yield, fruit set rate, etc., offering high flexibility.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of fruit tree cultivation, in particular to a thinning agent and a method of using the same. BACKGROUND

[0002] The information disclosed in this Background section is only for the purpose of increasing an understanding of the general context of the present application and does not necessarily constitute an acknowledgement or any form of suggestion that this information forms part of the prior art already known to a person of ordinary skill in the art.

[0003] Thinning is a measure of orchard management, which plays an important role in the growth and development of fruit trees, flowering and fruiting. Apple trees have the habit of abundant fruiting under natural growth conditions, with 4-7 flowers per inflorescence, the central flower opens first and the side flowers open later. In the case of excessive fruiting, apple trees will consume a large amount of nutrients from the tree body, leading to nutrient deficiency and poor development of the fruit trees, resulting in a decrease in fruit quality and commodity value, and a vicious cycle of alternate bearing. Therefore, it is necessary to use the method of thinning to retain a healthy flower and fruit, improve the fruit setting rate of apple trees, improve fruit quality, and strengthen the tree body to achieve the purpose of continuous high-quality and stable yield cultivation.

[0004] Thinning techniques mainly include artificial thinning, chemical thinning and mechanical thinning. Among them, artificial thinning has the highest accuracy, but requires a large amount of manpower, material resources and financial resources. According to statistics, the cost of artificial thinning and fruit bagging accounts for more than 30% of the total cost, which is difficult to meet the needs of the development of China's apple industry. Mechanical thinning has low accuracy and can cause mechanical damage to the tree body, and is rarely used in China. Chemical thinning has high efficiency and low cost, and is the main development direction of thinning technology at present.

[0005] Chemical thinning is based on the different periods of different chemical reagents after flowering of fruit trees, and the appropriate reagent and appropriate spraying period are determined by the load. The currently reported apple thinning agent still has some problems in actual application.

[0006] Patent CN104839208A provides a thinning agent with calcium formate as the main drug, which uses the time difference between the central flower and the side flower of apple, sprays the drug when the first 1-2 side flowers open after the central flower blooms, burns the style of the side flower, prevents the pollen tube from elongating, and sprays again after 1-2 days. However, when the apple flowering period encounters high temperature weather, the interval period between the central flower and the side flower is greatly shortened, and reckless spraying cannot guarantee the thinning effect, thereby greatly reducing the use rate of the product.

[0007] Patent CN103694037A provides a kind of with gibberellic acid, benzylaminopurine, brassinolide and amino acid water-soluble fertilizer as raw material apple fruit setting agent, in the center of apple flower 20-30% when blooming, after 10-15 days of spraying, second spraying is carried out.This formula needs two times of spraying to obtain good thinning effect, and its product contains gibberellic acid (i.e.gibberellin), this endogenous hormone is non-polar transport, can stimulate the growth of fruit trees while promoting the growth of fruit, and can stimulate the plant itself to produce gibberellin.For the apple tree of tree vigor, two times of spraying product containing gibberellin can easily cause branchy, affect the quality of flower bud differentiation.

[0008] In summary, in the prior art, the use of apple tree thinning agent is susceptible to weather conditions, and at least two times of spraying can achieve good thinning effect, and multiple spraying of thinning agent containing gibberellin can easily cause branchy and lead to poor quality of flower bud differentiation. SUMMARY

[0009] In view of the above problems, the present application provides a kind of thinning agent and use method, not susceptible to extreme weather, and good thinning effect can be achieved by one time of spraying, which greatly reduces labor cost, and can be sprayed multiple times to continue to improve thinning effect, greatly increases the flexibility of spraying, and has good economic benefit.

[0010] To achieve the above technical purposes, the technical scheme adopted by the present application is as follows:

[0011] In a first aspect of the present application, a kind of thinning agent is provided, comprising: 6-benzylaminopurine, naphthalene acetic acid and growth regulator;The growth regulator includes one or more of brassinolide, gibberellin, indolebutyric acid, chlorocholine, triacontanol, amino acid ester, 2,4D, ethephon;Wherein, the mass ratio of 6-benzylaminopurine and naphthalene acetic acid is 1-10:1.

[0012] In a second aspect of the present application, a kind of thinning agent is provided, comprising calcium formate and / or 5-ALA, and ethephon and / or naphthalene acetic acid are further added.

[0013] In a third aspect of the present application, a method for improving the thinning effect of apple is provided, which only sprays the thinning agent provided in the first aspect once, and the specific method is as follows: the thinning agent provided in the first aspect is diluted with water and mixed, the use concentration of 6-benzylaminopurine in the thinning agent is controlled to be 5-200 mg / L, and the mixed thinning agent is sprayed when the center of apple flower is opened 20-30%;

[0014] Alternatively, the flower thinning agent provided in the second aspect is sprayed only once, and the specific method is as follows: the flower thinning agent provided in the second aspect is diluted with water and mixed, and the use concentration of calcium formate or 5-ALA in the flower thinning agent is controlled to be 10-40 g / L or 10-200 mg / L, respectively; the mixed flower thinning agent is sprayed after 1-2 days when the central flowers of the apple tree are 20-30% open;

[0015] Alternatively, the flower thinning agent provided in the first aspect is sprayed first, and then the flower thinning agent provided in the second aspect is sprayed, and the specific method is as follows: the flower thinning agent provided in the first aspect is diluted with water and mixed, and the use concentration of 6-benzylaminopurine in the flower thinning agent is controlled to be 5-200 mg / L; the mixed flower thinning agent is sprayed when the central flowers of the apple tree are 20-30% open; 1-2 days later, the flower thinning agent provided in the second aspect is diluted with water and mixed, and the use concentration of calcium formate or 5-ALA in the flower thinning agent is controlled to be 10-40 g / L or 10-200 mg / L, respectively; then the mixed flower thinning agent is sprayed.

[0016] The beneficial effects of the present application are as follows:

[0017] (1) The flower thinning agent of the present application can achieve good flower thinning and fruit thinning effect only by spraying once, and the single fruit rate can reach 50-85%, which not only avoids the influence of branch growth on flower bud differentiation caused by spraying twice of the product containing gibberellin, but also greatly reduces the labor intensity and labor cost. In addition, even in the case that the interval between the opening time of the central flowers and the side flowers is greatly shortened at high temperature, the flower thinning agent of the present application can still play an effective role.

[0018] (2) The two flower thinning agents provided in the present application can also be used in combination, i.e., the flower thinning agent containing 6-benzylaminopurine is applied first, and then the flower thinning agent containing calcium formate or 5-ALA is applied, which can greatly improve the single fruit rate, and the single fruit rate can reach more than 90%. In actual fruit tree management, whether to spray the flower thinning agent containing calcium formate or 5-ALA and the specific spraying times can be selected according to the weather conditions or the requirements for fruit setting rate and yield, which has high flexibility. DETAILED DESCRIPTION

[0019] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as generally understood by those skilled in the art to which the present application belongs.

[0020] To solve the problem that the use of the apple tree thinning agent is easily affected by extreme weather conditions and a single spraying cannot achieve good thinning effect, the present application provides a thinning agent in one embodiment, comprising: 6-benzylaminopurine, naphthalene acetic acid and a growth regulator; the growth regulator comprises one or more of brassinolide, gibberellin, indole butyric acid, chlorocholine, triacontanol, amaranthine, 2,4D and ethephon.

[0021] The mass ratio of the 6-benzylaminopurine and the naphthalene acetic acid is 1:10-10:1; in the growth regulator, the mass ratio of the brassinolide to the 6-benzylaminopurine is 1-10:2500; the mass ratio of the gibberellin to the 6-benzylaminopurine is 1:1-3; the mass ratio of the indole butyric acid to the 6-benzylaminopurine is 1:0.5-5; the mass ratio of the chlorocholine to the 6-benzylaminopurine is 1:3-20; the mass ratio of the triacontanol to the 6-benzylaminopurine is 1:10-50; the mass ratio of the amaranthine to the 6-benzylaminopurine is 1:1-3; the mass ratio of the 2,4D to the 6-benzylaminopurine is 1:1-5; and the mass ratio of the ethephon to the 6-benzylaminopurine is 1-15:1.

[0022] The above-mentioned thinning agent plays a role in flower retention, and the benzylaminopurine in the formula, together with the naphthalene acetic acid, guides the nutrients to the central flower, so that the central flower has a stronger competitive advantage than the side flower, and the combination of the two produces more ethylene, promoting the shedding of the side fruit. The remaining components act as growth regulators to promote growth, enhance the competition between the central flower and the side flower, and indirectly promote the shedding of the side fruit. When gibberellin is used as the growth regulator, it is more effective when used in combination with ethephon.

[0023] The present application provides a thinning agent in another embodiment, comprising: calcium formate and / or 5-ALA, and further adding ethephon and / or naphthalene acetic acid.

[0024] When the thinning agent comprises calcium formate and ethephon, the mass ratio of the calcium formate to the ethephon is 300:1-10.

[0025] When the thinning agent comprises calcium formate and naphthalene acetic acid, the mass ratio of the calcium formate to the naphthalene acetic acid is 3000:1-10.

[0026] When the thinning agent comprises calcium formate and 5-ALA, the mass ratio of the calcium formate to the 5-ALA is 1000:1-10.

[0027] When the thinning agent comprises 5-ALA and ethephon, the mass ratio of the 5-ALA to the ethephon is 1-10:50.

[0028] When the thinning agent comprises 5-ALA and naphthalene acetic acid, the mass ratio of the 5-ALA to the naphthalene acetic acid is 1-10:1.

[0029] The flower thinning agent containing calcium formate or 5-ALA mainly plays a role of killing flowers, i.e. preventing pollen germination of side flowers and axillary flowers and preventing pollen tube elongation and fertilization of side flowers and axillary flowers, affecting their pollination and fertilization: on the one hand, making the flowers that cannot pollinate and fertilize fall off; on the other hand, making the flowers that complete pollination and fertilization have small fruits due to slow growth of pollen tubes, when used in combination with the existing fruit thinning agent, nutrients are concentrated to large fruits, resulting in the fruits of side flowers and axillary flower buds lacking sufficient nutrients and falling off, so that a better flower and fruit thinning effect can be achieved.

[0030] In another embodiment, the present application provides a method for improving the flower thinning effect of apples, comprising:

[0031] (1) only once spraying the flower thinning agent containing 6-benzylaminopurine, the specific method is: mixing the flower thinning agent containing 6-benzylaminopurine after dilution with water, controlling the use concentration of 6-benzylaminopurine therein to be 5-200 mg / L, and spraying the mixed flower thinning agent when the central flowers of apples open for 20-30%. Since the central flowers open earlier than the side flowers, spraying the above flower thinning agent at this time is more conducive to establishing the competitive advantage of the central flowers, adjusting nutrients to the central flowers, thereby indirectly promoting the falling off of side fruits, and achieving a good flower thinning effect.

[0032] (2) only once spraying the flower thinning agent containing calcium formate or 5-ALA, the specific method is: mixing the flower thinning agent containing calcium formate or 5-ALA after dilution with water, controlling the use concentration of calcium formate therein to be 10-40 g / L or the use concentration of 5-ALA to be 10-200 mg / L, and spraying the mixed flower thinning agent 1-2 days after the central flowers of apples open for 20-30%. Since the pollen tube grows in the style after pollen germination, it needs to pass through the style to reach the ovary to complete fertilization, and 1-2 days after the central flowers open for 20-30%, the pollen tube of the central flowers has grown more than half of the total length of the style, so spraying the flower thinning agent will not have a great impact on the growth of the central flowers; at this time, the side flowers have just opened, and the flower thinning agent can prevent pollen germination of side flowers and axillary flowers and prevent pollen tube elongation and fertilization of side flowers and axillary flowers (i.e. playing a role of killing flowers), affecting their pollination and fertilization, thereby playing a role of flower thinning.

[0033] (3) first spray the 6-benzylaminopurine-containing deflowering agent, and then spray the calcium formate or 5-ALA-containing deflowering agent, the specific method being: mixing the 6-benzylaminopurine-containing deflowering agent after dilution with water, and controlling the use concentration of 6-benzylaminopurine therein to be 5-200 mg / L, and then spraying the mixed deflowering agent when the apple center flower is 20-30% open; 1-2 days later, mixing the 6-benzylaminopurine-containing deflowering agent after dilution with water, and controlling the use concentration of calcium formate therein to be 10-40 g / L or the use concentration of 5-ALA to be 10-200 mg / L; and then spraying the mixed deflowering agent. The two deflowering agents are used in combination, that is, the strategy of first flower protection and then flower killing is adopted, so that a more excellent deflowering effect can be obtained.

[0034] Further, the 6-benzylaminopurine-containing deflowering agent is mixed uniformly after dilution with water, and then mixed uniformly with a foliar fertilizer, the foliar fertilizer including one or more of an amino acid foliar fertilizer, a seaweed fertilizer or a boron fertilizer; the concentration of the foliar fertilizer being 3-5 g / L.

[0035] When the 6-benzylaminopurine-containing deflowering agent is sprayed only once, the use concentrations of the other components are as follows: naphthalene acetic acid 5-60 mg / L, brassinolide 0.01-0.1 mg / L, gibberellin 10-100 mg / L, indole butyric acid 10-50 mg / L, chlorflurenol 5-20 mg / L, tridodecyl alcohol 0.5-3 mg / L, profenofel 10-50 mg / L, 2,4D 5-30 mg / L and ethylene 50-500 mg / L.

[0036] Preferably, the 6-benzylaminopurine is 20-50 mg / L, the naphthalene acetic acid is 5-20 mg / L, the brassinolide is 0.02-0.08 mg / L, the gibberellin is 20-40 mg / L, the indole butyric acid is 15-25 mg / L, the chlorflurenol is 10-15 mg / L, the tridodecyl alcohol is 0.8-2 mg / L, the profenofel is 15-40 mg / L, the 2,4D is 10-20 mg / L and the ethylene is 100-300 mg / L.

[0037] When the calcium formate or 5-ALA-containing deflowering agent is sprayed only once, the use concentrations of the other components are as follows: ethylene 200-1000 mg / L and naphthalene acetic acid 5-40 mg / L; preferably, the calcium formate is 10-30 g / L, the 5-ALA is 10-100 mg / L, the ethylene is 250-600 mg / L and the naphthalene acetic acid is 10-30 mg / L.

[0038] When the 6-benzylaminopurine-containing deflowering agent is sprayed first and then the calcium formate or 5-ALA-containing deflowering agent is sprayed, the use concentrations of the components of the 6-benzylaminopurine-containing deflowering agent are as follows: 6-benzylaminopurine 20-50 mg / L, naphthalene acetic acid 5-20 mg / L, rapigon 0.008-0.02 mg / L, gibberellin 20-40 mg / L, indolebutyric acid 15-25 mg / L, chlortranuron 10-15 mg / L, tridcanol 0.8-2 mg / L, alkenylsuccinic acid 15-40 mg / L, 2,4D 10-20 mg / L, and ethylene 100-300 mg / L; and the use concentrations of the calcium formate or 5-ALA-containing deflowering agent are as follows: calcium formate 10-30 g / L, 5-ALA 10-30 mg / L, ethylene 100-250 mg / L, and naphthalene acetic acid 5-30 mg / L. The calcium formate or 5-ALA-containing deflowering agent is sprayed at least once, and the interval between adjacent two spraying times is at least 1-2 days.

[0039] The application will be further described in detail below with reference to specific examples, which are intended to explain but not limit the application.

[0040] Example 1

[0041] In April 2023, apple tree variety "Venus Gold" was used as the test tree species for deflowering agent spraying test in Liaocheng City Yankang Fruit Co., Ltd. Each formula in the following table has 40 test tree species, and the tree species are all dwarf self-rooting. The weather conditions during spraying: April 2: overcast, 21℃, south wind 3-4 levels.

[0042] Table 1 is the deflowering agent spraying situation and results of different deflowering agent formulas of the application. Each component in the corresponding mixed solution has the following concentration after the deflowering agent formulas in Table 1 are diluted, dissolved, and mixed: 6-benzylaminopurine 20 mg / L, naphthalene acetic acid 10 mg / L, rapigon 0.04 mg / L, gibberellin 20 mg / L, indolebutyric acid 20 mg / L, chlortranuron 10 mg / L, tridcanol 1 mg / L, alkenylsuccinic acid 15 mg / L, 2,4D 15 mg / L, ethylene 250 mg / L, and the concentration of amino acid foliar fertilizer is 4 g / L.

[0043] Table 1 is the deflowering agent spraying situation and results of different deflowering agent formulas of the application. Each component in the corresponding mixed solution has the following concentration after the deflowering agent formulas in Table 1 are diluted, dissolved, and mixed: 6-benzylaminopurine 20 mg / L, naphthalene acetic acid 10 mg / L, rapigon 0.04 mg / L, gibberellin 20 mg / L, indolebutyric acid 20 mg / L, chlortranuron 10 mg / L, tridcanol 1 mg / L, alkenylsuccinic acid 15 mg / L, 2,4D 15 mg / L, ethylene 250 mg / L, and the concentration of amino acid foliar fertilizer is 4 g / L.

[0044]

[0045]

[0046] The test results in Table 1 show that:

[0047] (1) Using 6-benzylaminopurine (6-BA) combined with naphthalene acetic acid and other growth regulators (A1-A9), spraying once at 25% of the central flower opening can achieve good thinning effect, and the single fruit rate is as high as 60-83%;

[0048] (2) Using gibberellin as the only growth regulator (B1), the single fruit rate is low, only 55%, but when combined with other growth regulators such as ethephon (A4) and brassinolide (A5), the single fruit rate can be as high as 70%, and the effect of using gibberellin and ethephon together is better, and the thinning effect of this formula is 7 days earlier than other formulas.

[0049] (3) Using only one of 6-BA and naphthalene acetic acid combined with other growth regulators, spraying once cannot achieve good thinning effect, and the single fruit rate is only 15-50% (B2-B5).

[0050] In this example, the thinning agent is sprayed when the central flower is about 25% open. Since the central flower opens earlier than the side flower, the flower part has a clear advantage in applying the medicine, so spraying at this time is more conducive to establishing the competitive advantage of the central flower, thereby making the side flower fruit small and indirectly promoting the shedding of the side fruit.

[0051] Example 2

[0052] In April 2023, in Liaocheng Yuan Kang Fruit Co., Ltd., apple tree variety "Fu Shi" was used as the test tree species for thinning agent spraying test. Each formula in the following table has 40 test tree species, and the tree species are all dwarf self-rooting. Weather conditions during spraying: April 5: cloudy to overcast, 15°C, north wind 3-4 levels; April 6: sunny, 15°C, north wind 3-4 levels; April 7: sunny, 15°C, southwest wind 2 levels.

[0053] Table 2 is the thinning agent spraying situation and results of different thinning agent formulas of the present application. Each group of thinning agent formulas in Table 2 is diluted, dissolved, and mixed with water, and the concentrations of each component in the corresponding mixed solution are as follows: calcium formate 25 g / L, 5-ALA 60 mg / L, ethephon in A6 formula 400 mg / L, and ethephon in the remaining formulas 250 mg / L; naphthalene acetic acid in A3 and A5 formulas 20 mg / L, and naphthalene acetic acid in the remaining formulas 10 mg / L. B3 group is sprayed twice, B5 group is sprayed three times, and the remaining test groups are only sprayed once.

[0054] Table 2 is the thinning agent spraying situation and results of different thinning agent formulas of the present application. Each group of thinning agent formulas in Table 2 is diluted, dissolved, and mixed with water, and the concentrations of each component in the corresponding mixed solution are as follows: calcium formate 25 g / L, 5-ALA 60 mg / L, ethephon in A6 formula 400 mg / L, and ethephon in the remaining formulas 250 mg / L; naphthalene acetic acid in A3 and A5 formulas 20 mg / L, and naphthalene acetic acid in the remaining formulas 10 mg / L. B3 group is sprayed twice, B5 group is sprayed three times, and the remaining test groups are only sprayed once.

[0055]

[0056] Patent CN102090396A shows that 5-aminolevulinic acid (5-ALA) has a deflowering effect, which can inhibit pollen germination and pollen tube elongation, hinder fruit tree pollination and fertilization, and promote flower and young fruit abscission; the use method is to spray 5-ALA solution with a concentration of 200-1000 mg / L at the flowering stage of fruit trees. The cost of 5-ALA product is relatively high, and subsequent research materials show that low concentrations of the product also have a deflowering effect. However, the inventors found that only one spraying of a low-concentration 5-ALA solution (20 mg / L) had poor deflowering effect on apple trees, and the single fruit rate was almost 0, which was specifically manifested in: first, the flower stems that did not complete fertilization were not easy to fall off; second, the flowers and fruits that completed fertilization were inhibited during the fertilization process, resulting in small and non-falling fruits. Even if multiple sprays are used, as shown in Table B5, it is also difficult to achieve the desired deflowering effect.

[0057] Calcium formate is a commonly used deflowering agent, however, the inventors found that when used alone and sprayed only once, the single fruit rate was only 8%; even if sprayed twice, the single fruit rate could only reach 43%, as shown in Tables B2 and B3 above.

[0058] The inventors found that when calcium formate is used in combination with 5-ALA, only one spraying also has difficulty achieving good deflowering effect, and the single fruit rate is only 30%. However, when calcium formate and / or 5-ALA is used in combination with naphthalene acetic acid and / or ethylene (as shown in the A1-A6 formulations in the above table), the single fruit rate of one deflowering can be greatly increased, and the single fruit rate is more than 50%, and even up to 84%.

[0059] The spraying time of the flower thinning agent formulations A1-A6 in this embodiment is 2 days after 25% of the central flowers open. Only one spraying can achieve good thinning effect. Calcium formate in the formulation prevents the day's open flowers from pollination by burning the stigma. The number of pollen adhering and the pollen tube elongation are reduced by 50% before pollination. The treatment one day after pollination also significantly inhibits pollen tube elongation. Ethrel affects fertilization by inhibiting pollen tube elongation. Naphthalene acetic acid can prevent the normal growth of pollen tube. 5-ALA can cause abnormal growth of pollen, significantly reduce pollen germination rate and pollen tube elongation rate, thereby preventing fertilization. The last three can be conducted in the plant body, thereby increasing the efficiency. Ethrel can also induce plants to produce ethylene to enhance the flower thinning effect. In A1-A6 of this embodiment, only A6 uses ethrel normally, and the concentrations of the others are lower than the normal value. Because it has a long thinning period, a fast thinning effect, and a risk of excessive thinning, it is easy to thin. Although the risk can be reduced by using it with naphthalene acetic acid, the effect is still not stable. It can overcome this defect by increasing the concentration of 5-ALA and then reducing the concentration of ethrel when mixed with 5-ALA. The experimental data of A6 looks good, but there is still a phenomenon of excessive thinning on young vigorous apple trees. This is particularly prominent on weak trees. Because the auxin of weak trees has low resistance to ethrel, weak trees cannot be thinned with ethrel. The excessive thinning of this formulation is strong on poorly developed flowers and axillary flower buds, and the rest are healthy flower buds. When A6 is sprayed, a small atomizing nozzle is used, and it is gently swept across. Do not repeat the spraying.

[0060] Example 3

[0061] In April 2023, in Liaocheng Yuan Kang Fruit Co., Ltd., apple tree variety "Venus Gold" was used as the test tree species for flower thinning agent spraying test. Each formula in the table below has 30 test tree species, and the tree species are all dwarf self-rooting. Weather conditions during spraying: April 2: overcast, 21°C, south wind 3-4 levels; April 4: overcast, 9°C, north wind 4-5 levels.

[0062] After the flower thinning agent is diluted with water, it is dissolved and mixed uniformly. The concentrations of each component in the corresponding mixed solution are as follows:

[0063] A1 group:

[0064] Formula one: 6-benzylaminopurine 20 mg / L, naphthalene acetic acid 10 mg / L, prohexadione calcium 15 mg / L, brassinolide 0.04 mg / L, and the rest is water.

[0065] Formula two: calcium formate 20 g / L, ethrel 150 mg / L, and the rest is water.

[0066] A2 group:

[0067] Formulation one: 6-benzylaminopurine 20 mg / L, naphthalene acetic acid 10 mg / L, tridodecyl alcohol 1 mg / L, brassinolide 0.04 mg / L, and the rest is water.

[0068] Formulation two: 5-ALA 20 mg / L, ethephon 200 mg / L, and the rest is water.

[0069] Spraying method: Formulation one is sprayed in the afternoon of April 2 (first spraying), and formulation two is sprayed in the afternoon of April 4 (second spraying).

[0070] On May 1, the fruit setting rate is observed, and the results are shown in Table 3:

[0071] Table 3 Fruit setting rate of apple trees in Example 3 on May 1

[0072]

[0073] From the above test results, it can be seen that the application adopts the scheme of spraying flower thinning agent first and then spraying flower killing agent, and a very high single fruit rate of more than 90% is obtained, which has a very good flower thinning and fruit thinning effect.

[0074] Example 4

[0075] In April 2023, in Liaocheng Yuan Kang Fruit Co., Ltd., apple tree variety "Venus Gold" was used as the test tree species to conduct flower thinning agent spraying test. Each formulation in the following table has 30 test tree species, and the tree species all belong to dwarf self-rooting system. The weather conditions during spraying: April 2: overcast, 21℃, south wind 3-4 levels; April 4: overcast, 9℃, north wind 4-5 levels; April 6: sunny, 15℃, northeast wind 3-4 levels.

[0076] The flower thinning agent is diluted with water, dissolved and mixed uniformly, and the concentrations of each component in the corresponding mixed solution are as follows:

[0077] Formulation one: 6-benzylaminopurine 20 mg / L, naphthalene acetic acid 15 mg / L, and amifloxide 25 mg / L, and the rest is water.

[0078] Formulation two: 5-ALA 20 mg / L, calcium formate 15 g / L, naphthalene acetic acid 10 mg / L, and the rest is water.

[0079] Spraying method: Formulation one is sprayed in the afternoon of April 2 (first spraying), formulation two is sprayed in the afternoon of April 4 (second spraying), and formulation two is sprayed in the afternoon of April 6 (third spraying).

[0080] On May 1, the fruit setting rate is observed, and the results are shown in Table 4:

[0081] Table 4 Fruit setting rate of apple trees in Example 4 on May 1

[0082]

[0083] From the above test results, it can be seen that the present application adopts the scheme of first spraying the flower-thinning agent and then spraying the flower-killing agent multiple times, obtaining a very high single fruit rate of up to 97%, and having a very good flower-thinning and fruit-thinning effect.

[0084] Finally, it should be noted that the above only describes the preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements of some parts. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method of improving the thinning effect of apples, characterized in that, The 6-benzylaminopurine-containing defoliant is applied first, and then the calcium formate-containing defoliant is applied. The 6-benzylaminopurine-containing defoliant comprises 6-benzylaminopurine, naphthalene acetic acid and growth regulators; the growth regulators comprise naphthalene acetic acid and brassinolide; or the growth regulators comprise naphthalene acetic acid, brassinolide and amidoxy; or the growth regulators comprise gibberellin, ethephon; The mass ratio of the 6-benzylaminopurine and the naphthalene acetic acid is 1-10:1; the mass ratio of the brassinolide and the 6-benzylaminopurine is 1-10:2500; the mass ratio of the triacontanol and the 6-benzylaminopurine is 1:10-50; the mass ratio of the amidoxy and the 6-benzylaminopurine is 1:1-3; the mass ratio of the gibberellin and the 6-benzylaminopurine is 1:1-3; and the mass ratio of the ethephon and the 6-benzylaminopurine is 1-15:

1. The calcium formate-containing defoliant comprises calcium formate and ethephon, or the calcium formate-containing defoliant comprises calcium formate and naphthalene acetic acid; the mass ratio of the calcium formate and the ethephon is 300:1-10, and the mass ratio of the calcium formate and the naphthalene acetic acid is 3000:1-10. The specific method is as follows: The 6-benzylaminopurine-containing defoliant is diluted with water and mixed uniformly, and the use concentration of the 6-benzylaminopurine is controlled to be 5-200 mg / L, the use concentration of the naphthalene acetic acid is controlled to be 5-60 mg / L, the use concentration of the brassinolide is controlled to be 0.01-0.1 mg / L, the use concentration of the triacontanol is controlled to be 0.5-3 mg / L, the use concentration of the amidoxy is controlled to be 10-50 mg / L, the use concentration of the gibberellin is controlled to be 10-100 mg / L, and the use concentration of the ethephon is controlled to be 50-500 mg / L; the mixed defoliant is sprayed when the apple center flower is 20-30% open; the calcium formate-containing defoliant is diluted with water and mixed uniformly after 1-2 days, the use concentration of the calcium formate is controlled to be 10-30 g / L, the use concentration of the ethephon is controlled to be 100-250 mg / L, and the use concentration of the naphthalene acetic acid is controlled to be 5-30 mg / L; and then the mixed defoliant is sprayed.

2. The method of using an antistatic agent according to claim 1, wherein The 6-benzylaminopurine-containing defoliant comprises 6-benzylaminopurine, naphthalene acetic acid, brassinolide, amidoxy, gibberellin and ethephon, and the use concentration of each component of the 6-benzylaminopurine-containing defoliant is as follows: the use concentration of the 6-benzylaminopurine is 20 mg / L, the use concentration of the naphthalene acetic acid is 10 mg / L, the use concentration of the brassinolide is 0.04 mg / L, the use concentration of the amidoxy is 15 mg / L, the use concentration of the gibberellin is 20 mg / L, and the use concentration of the ethephon is 250 mg / L; and the use concentration of each component of the calcium formate-containing defoliant is as follows: the use concentration of the calcium formate is 20 g / L, and the use concentration of the ethephon is 150 mg / L.

3. The use method of the defoliant according to claim 1, characterized in that, The 6-benzylaminopurine-containing defoliant is diluted with water and mixed uniformly, and then is mixed with a leaf fertilizer uniformly; the leaf fertilizer comprises one or more of an amino acid leaf fertilizer, a seaweed fertilizer and a boron fertilizer; and the concentration of the leaf fertilizer is 3-5 g / L. A fruit-thinning agent containing components of trichlorphon, naphthalene acetic acid, urea and potassium dihydrogen phosphate is sprayed within 10-15 days after the calcium formate-containing defoliant is applied.

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