Method for improving heat resistance of kiwi fruit leaves

Abstract

The invention discloses a method for improving heat resistance of kiwi fruit leaves. The method specifically comprises the following steps: pruning kiwi fruit plants in summer; after pruning in summer, mixed liquid of calcium chloride, cane sugar, sodium carboxymethyl cellulose and 5-aminolevulinic acid is sprayed to the leaf surfaces of the kiwi fruits. According to the method, summer pruning is combined with spraying of a mixed solution of calcium chloride, cane sugar, sodium carboxymethyl cellulose and 5-aminolevulinic acid, the response degree of relevant physiological indexes of the kiwi fruits to high temperature can be effectively improved, the heat resistance and high-temperature adaptability of the kiwi fruits are remarkably enhanced, and operation is easy; according to the method, the adhesion rate of effective components of the mixed solution on leaves can be remarkably increased, the absorption effect of the kiwi leaves on the effective components in the solution is enhanced, the cost of main materials for preparing the mixed solution is low, and large-area popularization and application are facilitated.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural production, and particularly relates to a method for improving the heat resistance of kiwifruit leaves. Background Art

[0002] Kiwifruit (Actinidia) is a perennial vine plant of the Actinidia family. It prefers a warm and humid climate environment and is evenly planted on a large scale in Shaanxi, Sichuan, Henan, Hunan, Hubei and other provinces in my country. In recent years, with the continuous development of the kiwifruit industry, more and more kiwifruit planting areas have rapidly expanded from mountainous areas with suitable climatic and environmental conditions to medium and low altitude areas with flat terrain and convenient transportation. However, in the middle and lower reaches of the Yangtze River and medium and low altitude areas such as Guizhou and Yunnan, extreme summer climates, including absolute high temperatures and long-term continuous high temperatures, occur frequently. The leaves of kiwifruit plants fall due to the influence of extreme summer temperatures. In severe cases, a large number of fruits are sunburned, fruit falls, and even plants die. The output rate of high-quality fruits and economic benefits have dropped significantly, bringing severe challenges to kiwifruit production in these areas. This is a major technical problem that needs to be solved in the development of the kiwifruit industry in medium and low altitude areas.

[0003] In terms of existing technology and production, some orchards use covered shade nets, which can reduce the proportion of kiwifruit leaf fall and sunburn caused by high temperature and strong light in summer to a certain extent; Chinese patent (application number: 202110289208X) discloses a method for improving the heat resistance of kiwifruit plants by intercropping between kiwifruit rows and spraying rare earth lanthanum solution on the leaves at night; Chinese patent (application number: 202211181551.3) discloses a method for improving the heat resistance of kiwifruit plants. By spraying kiwifruit leaves with a concentration of 50 mol / L or 100 mol / L of hydrogen peroxide at night, the resistance of kiwifruit plants to high temperature stress of 40°C can be improved, which can prevent the kiwifruit plants from being overheated. Heat-resistant kiwifruit plants survive 12 hours at 40°C; Chinese patent (application number: 201910011148.8) discloses a method for preventing high-temperature sunburn in kiwifruit, which involves relocating the branches of the kiwifruit tree, using the relocated branches to build a bird's nest-shaped shelter to protect the kiwifruit, and combining other sheltering measures to prevent damage to kiwifruit caused by high-temperature sunburn; Chinese patent (application number: 201611254380.7) discloses a method for alleviating high-temperature stress in kiwifruit trees, which includes the following steps: When the kiwifruit branches grow to five leaves and one heart, water them with a concentration of 50-200 μmol of melatonin, once every two days, for a total of five times. These technologies are of certain significance for protecting trees and leaves, but they also have limitations such as inconvenient field operations and limited applicable scenarios. How to take effective measures in kiwifruit production gardens at medium and low altitudes to reduce or even solve the problem of leaf fall caused by high temperature damage has always been one of the focuses of attention in the kiwifruit industry. Summary of the invention

[0004] The object of the present invention is to provide a method for improving the heat tolerance of kiwifruit leaves in view of the industrial technical demand for the defoliation of kiwifruit caused by the high temperature hazard in the middle and low altitude areas and the problems of inconvenient field operation and limited application scenarios existing in the prior art.

[0005] In order to achieve the above object, the technical scheme adopted by the present invention is as follows:

[0006] A method for improving the heat tolerance of kiwifruit leaves specifically includes the following steps:

[0007] S1. Prune the kiwifruit tree body in summer;

[0008] S2. After step S1, spray a mixed solution of calcium chloride, sucrose, sodium carboxymethylcellulose and 5-aminolevulinic acid on the kiwifruit leaf surface.

[0009] The pruning requirement in step S1 is as follows: for the plants with a complete crown, remove some branches in the over-dense parts so that about 1 / 3 of the sunlight can penetrate the crown; for the plants without a complete crown, bind the vines to make the branches evenly disperse on the kiwifruit trellis surface.

[0010] In the mixed solution in step S2, the concentration of calcium chloride is 1.0 g / L to 10.0 g / L, the concentration of sucrose is 5.0 g / L to 50.0 g / L, the concentration of sodium carboxymethylcellulose is 2.0 g / L to 20.0 g / L, and the concentration of 5-aminolevulinic acid is 5.0 mg / L to 30.0 mg / L.

[0011] In the mixed solution in step S2, the concentration of calcium chloride is 4.0 g / L, the concentration of sucrose is 10.0 g / L, the concentration of sodium carboxymethylcellulose is 5.0 g / L, and the concentration of 5-aminolevulinic acid is 10.0 mg / L.

[0012] The spraying time of the mixed solution in step S2 is from the 5th day to the 45th day after step S1 is completed, the spraying times are 1 to 3 times, the spraying amount per time is 30.0 L / mu to 60.0 L / mu, and the interval time between each spraying is 15 days to 30 days.

[0013] The spraying time of the mixed solution in step S2 is the 7th day after step S1 is completed, the spraying times are 3 times, the spraying amount per time is 48.0 L / mu, and the interval time between each spraying is 25 days.

[0014] The spraying part of the mixed solution in step S2 is on the kiwifruit leaves, and the leaves include new leaves, mature leaves and old leaves.

[0015] In the spraying method of the mixed solution in step S2, the front and back sides of the leaves are sprayed until water droplets fall on both the front and back sides of all leaves.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. Sodium carboxymethyl cellulose in the mixed solution sprayed in the present invention can greatly improve the adhesion rate of the active ingredients of the mixed solution on the leaves, significantly enhance the absorption efficiency of the active ingredients in the mixed solution by kiwifruit leaves, and the absorption effect will not be affected even if it rains within 24 hours after spraying the mixed solution, which significantly improves the practicability of the present invention;

[0018] 2. By spraying a mixed solution of calcium chloride, sucrose, sodium carboxymethyl cellulose and 5-aminolevulinic acid at a low concentration, the present invention can effectively improve the response degree of relevant physiological indexes of kiwifruit to high temperature, significantly enhance the heat resistance and high temperature adaptation ability of kiwifruit, and the operation is simple;

[0019] 3. The main materials for preparing the mixed solution in the present invention are low in cost, which is conducive to large-scale popularization and use. Description of the Drawings

[0020] Figure 1 Effects of spraying mixed solutions with different concentrations of sodium carboxymethyl cellulose on the physiological indexes and leaf defoliation rate of 'Milang No. 1' kiwifruit

[0021] Figure 2 Effects of spraying mixed solutions with different concentrations of calcium chloride on the physiological indexes and leaf defoliation rate of 'Milang No. 1' kiwifruit

[0022] Figure 3 Effects of spraying mixed solutions with different concentrations of 5-aminolevulinic acid on the physiological indexes and leaf defoliation rate of 'Milang No. 1' kiwifruit

[0023] Figure 4 Effects of spraying mixed solutions with different frequencies on the leaf defoliation rate of 'Milang No. 1' Detailed Embodiments

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0025] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions conflicts or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0026] An embodiment of the present invention provides a method for improving the heat tolerance of kiwifruit leaves. The method includes two operation steps: summer pruning and spraying a mixed solution. The specific steps are as follows: S1, in summer, prune the kiwifruit tree body. The pruning requirements are as follows: for the plants with a complete crown, thin out some branches in the overcrowded parts so that about 1 / 3 of the sunlight can penetrate the crown; for the plants without a complete crown, tie the vines to evenly disperse the branches on the kiwifruit trellis surface; S2, after step S1, spray a mixed solution of calcium chloride, sucrose, sodium carboxymethylcellulose, and 5-aminolevulinic acid on the kiwifruit leaves. The concentration of calcium chloride in the mixed solution is 1.0 g / L to 10.0 g / L, the concentration of sucrose is 5.0 g / L to 50.0 g / L, the concentration of sodium carboxymethylcellulose is 2.0 g / L to 20.0 g / L, and the concentration of 5-aminolevulinic acid is 5.0 mg / L to 30.0 mg / L. The spraying time of the mixed solution is the 5th day to the 45th day after completing step S1, the spraying frequency is 1 to 3 times, the spraying amount per time is 30.0 L / mu to 60.0 L / mu, the interval time between each spraying is 15 days to 30 days, the spraying part is the leaves of kiwifruit, and the leaves include new leaves, mature leaves, and old leaves. The spraying method uses the front and back spraying method on the leaves until water droplets fall on both the front and back of all leaves.

[0027] The following further illustrates the present invention with specific embodiments.

[0028] Example 1

[0029] A method for improving the heat tolerance of kiwifruit leaves specifically includes the following steps: S1, in summer, prune the kiwifruit tree body. The pruning requirements are as follows: for the plants with a complete crown, thin out some branches in the overcrowded parts so that about 1 / 3 of the sunlight can penetrate the crown; for the plants without a complete crown, tie the vines to evenly disperse the branches on the kiwifruit trellis surface; S2, after step S1, spray a mixed solution of calcium chloride, sucrose, sodium carboxymethylcellulose, and 5-aminolevulinic acid on the kiwifruit leaves. The concentration of calcium chloride in the mixed solution is 4.0 g / L, the concentration of sucrose is 10.0 g / L, the concentration of sodium carboxymethylcellulose is 2.0 g / L, 5.0 g / L, 10.0 g / L, 15.0 g / L, 20.0 g / L respectively, and the concentration of 5-aminolevulinic acid is 10.0 mg / L. The spraying time of the mixed solution is the 7th day after completing step S1, the spraying frequency is 3 times, the spraying amount per time is 48 L / mu, the interval time between each spraying is 25 days, the spraying part is the leaves of kiwifruit, and the leaves include new leaves, mature leaves, and old leaves. The spraying method uses the front and back spraying method on the leaves until water droplets fall on both the front and back of all leaves.

[0030] The effects are as follows: The effects of spraying mixed solutions with different sodium carboxymethylcellulose concentrations on the physiological indexes and leaf defoliation rate of 'Milang No. 1' kiwifruit are as Figure 1 shown. After spraying the mixed solution with a calcium chloride concentration of 4.0 g / L, a sucrose concentration of 10.0 g / L, sodium carboxymethylcellulose concentrations of 2.0 g / L, 5.0 g / L, 10.0 g / L, 15.0 g / L, 20.0 g / L respectively, and a 5-aminolevulinic acid concentration of 10.0 mg / L, the physiological indexes of the leaves were measured 15 days before fruit harvesting, and the leaf defoliation rate was investigated. The peroxidase (POD) activities of the leaves of 'Milang No. 1' kiwifruit in the control and each treatment were 354.12 U / g, 446.25 U / g, 724.62 U / g, 697.41 U / g, 758.52 U / g and 802.54 U / g respectively; the superoxide dismutase (SOD) activities were 32.46 U / g, 45.22 U / g, 68.31 U / g, 66.84 U / g, 70.52 U / g and 68.45 U / g respectively; the malondialdehyde (MDA) contents were 20.56 nmol / g, 17.52 nmol / g, 12.36 nmol / g, 11.98 nmol / g, 12.24 nmol / g and 11.65 nmol / g respectively; the relative conductivity (CIR) was 46.3%, 34.6%, 20.8%, 21.3%, 19.6% and 19.4% respectively; the leaf defoliation rates were 36.4%, 24.5%, 14.2%, 15.6%, 14.8% and 15.4% respectively. The treatments with different sodium carboxymethylcellulose concentrations were significantly different from the control (P < 0.05).

[0031] Example 2

[0032] A method for improving the heat resistance of kiwifruit leaves specifically includes the following steps: S1. Prune the kiwifruit tree body in summer. The pruning requirements are as follows: For the plants with a complete crown, thin out some branches in the overcrowded parts so that about 1 / 3 of the sunlight can penetrate the crown; for the plants without a complete crown, tie the vines to make the branches evenly distributed on the kiwifruit trellis. S2. After step S1, spray a mixed solution of calcium chloride, sucrose, sodium carboxymethylcellulose and 5-aminolevulinic acid on the kiwifruit leaves. The calcium chloride concentrations in the mixed solution are 1.0 g / L, 4.0 g / L, 7.0 g / L and 10.0 g / L respectively, the sucrose concentration is 10.0 g / L, the sodium carboxymethylcellulose concentration is 5.0 g / L, and the 5-aminolevulinic acid concentration is 10.0 mg / L. The spraying time of the mixed solution is the 7th day after completing step S1, the spraying frequency is 3 times, the spraying amount per time is 48 L / mu, the interval time between each spraying is 25 days, the spraying part is the leaves of the kiwifruit, and the leaves include new leaves, mature leaves and old leaves. The spraying method adopts the method of spraying on both the front and back sides of the leaves until water drops fall from both the front and back sides of all the leaves.

[0033] The effects are as follows: The effects of spraying mixed solutions with different calcium chloride concentrations on the physiological indexes and defoliation rate of the leaves of Actinidia chinensis cv. Milang No. 1 are as Figure 2 shown. After spraying the control and the mixed solutions with calcium chloride concentrations of 1.0 g / L, 4.0 g / L, 7.0 g / L, and 10.0 g / L respectively, a sucrose concentration of 10.0 g / L, a sodium carboxymethyl cellulose concentration of 5.0 g / L, and a 5-aminolevulinic acid concentration of 10.0 mg / L, the physiological indexes of the leaves were measured 15 days before fruit harvesting, and the defoliation rate was investigated. The peroxidase (POD) activities of the leaves of Actinidia chinensis cv. Milang No. 1 were 354.12 U / g, 526.36 U / g, 952.06 U / g, 788.30 U / g, and 825.53 U / g respectively, the superoxide dismutase (SOD) activities were 32.46 U / g, 53.84 U / g, 78.52 U / g, 63.36 U / g, and 58.65 U / g respectively, the malondialdehyde (MDA) contents were 20.56 nmol / g, 14.65 nmol / g, 11.36 nmol / g, 13.65 nmol / g, and 14.23 nmol / g respectively, the relative conductivity (CIR) was 46.3%, 24.6%, 13.4%, 16.2%, and 14.8% respectively, and the defoliation rates were 36.4%, 19.2%, 11.8%, 14.6%, and 13.2% respectively. The treatments with different calcium chloride concentrations were significantly different from the control (P < 0.05).

[0034] Example 3

[0035] A method for improving the heat resistance of Actinidia chinensis leaves specifically includes the following steps: S1, pruning the Actinidia chinensis tree body in summer. The pruning requirements are as follows: For the plants with a complete canopy, thin out some branches in the overcrowded parts so that about 1 / 3 of the sunlight can penetrate the canopy; for the plants without a complete canopy, tie the vines to evenly disperse the branches on the Actinidia chinensis trellis surface; S2, after step S1, spray a mixed solution of calcium chloride, sucrose, sodium carboxymethyl cellulose, and 5-aminolevulinic acid on the Actinidia chinensis leaves. The calcium chloride concentration in the mixed solution is 4.0 g / L, the sucrose concentration is 10.0 g / L, the sodium carboxymethyl cellulose concentration is 5.0 g / L, and the 5-aminolevulinic acid concentrations are 5 mg / L, 10.0 mg / L, 20 mg / L, and 30 mg / L respectively. The spraying time of the mixed solution is the 7th day after completing step S1, the spraying frequency is 3 times, the spraying amount per time is 48 L / acre, the interval time between each spraying is 25 days, the spraying part is the leaves of Actinidia chinensis, and the leaves include new leaves, mature leaves, and old leaves. The spraying method adopts the method of spraying on both the front and back sides of the leaves until water droplets fall on both the front and back sides of all the leaves.

[0036] The effects are as follows: The effects of spraying mixed solutions with different concentrations of 5-aminolevulinic acid on the physiological indexes and defoliation rate of the leaves of Actinidia deliciosa cv. 'Milang 1' are as Figure 3 shown. After spraying with the control and the mixed solutions with calcium chloride concentration of 4.0 g / L, sucrose concentration of 10.0 g / L, sodium carboxymethylcellulose concentration of 5.0 g / L, and 5-aminolevulinic acid concentrations of 5 mg / L, 10.0 mg / L, 20 mg / L, 30 mg / L respectively, the physiological indexes of the leaves were measured 15 days before fruit harvesting, and the defoliation rate was investigated. The peroxidase (POD) activities of the leaves of Actinidia deliciosa cv. 'Milang 1' were 354.12 U / g, 451.68 U / g, 1283.25 U / g, 994.26 U / g, and 1091.74 U / g respectively, the superoxide dismutase (SOD) activities were 32.46 U / g, 44.26 U / g, 65.41 U / g, 58.33 U / g, and 61.14 U / g respectively, the malondialdehyde (MDA) contents were 20.56 nmol / g, 12.62 nmol / g, 9.25 nmol / g, 10.63 nmol / g, and 9.98 nmol / g respectively, the relative conductivity (CIR) was 46.3%, 22.39%, 14.51%, 15.28%, and 13.47% respectively, and the defoliation rates were 36.4%, 22.4%, 16.3%, 15.8%, and 15.2% respectively. There were significant differences between each treatment with different 5-aminolevulinic acid concentrations and the control (P < 0.05).

[0037] Example 4

[0038] A method for improving the heat resistance of Actinidia deliciosa leaves specifically includes the following steps: S1. Prune the Actinidia deliciosa tree body in summer. The pruning requirements are as follows: For the plants with a complete crown, remove some branches in the overcrowded parts so that about 1 / 3 of the sunlight can penetrate the crown; for the plants without a complete crown, tie the vines to evenly disperse the branches on the Actinidia deliciosa trellis. S2. After step S1, spray a mixed solution of calcium chloride, sucrose, sodium carboxymethylcellulose, and 5-aminolevulinic acid on the Actinidia deliciosa leaves. The calcium chloride concentration in the mixed solution is 4.0 g / L, the sucrose concentration is 10.0 g / L, the sodium carboxymethylcellulose concentration is 5.0 g / L, and the 5-aminolevulinic acid concentration is 10.0 mg / L. The spraying time of the mixed solution is the 7th day after completing step S1. The spraying times are 1 time, 2 times, and 3 times respectively. The spraying amount per time is 48 L / acre, and the interval time between each spraying is 25 days. The spraying part is on the leaves of Actinidia deliciosa, and the leaves include new leaves, mature leaves, and old leaves. The spraying method uses the method of spraying on both the front and back sides of the leaves until water droplets fall on both the front and back sides of all leaves.

[0039] The effects are as follows: The effects of spraying the mixed solution with different times on the defoliation rate of Actinidia deliciosa cv. 'Milang 1' are as Figure 4As shown in the figure, after the control and the treatments with spraying the mixture once, twice, and three times respectively, the physiological indexes of the leaves were measured 15 days before the fruit harvesting date, and the defoliation rates were investigated. The defoliation rates of the leaves of Actinidia chinensis Planch. cv. 'MiLiang 1' were 36.4%, 27.6%, 18.8%, and 15.2% respectively. There were significant differences between each treatment with different spraying times and the control (P < 0.05).

[0040] Example 5

[0041] A method for improving the heat tolerance of kiwifruit leaves specifically includes the following steps: S1, pruning the kiwifruit tree body in summer. The pruning requirements are as follows: for the plants with a complete canopy, remove some branches in the overcrowded parts so that about 1 / 3 of the sunlight can penetrate the canopy; for the plants without a complete canopy, bind the vines to evenly disperse the branches on the kiwifruit trellis surface; S2, after step S1, spray a mixture of calcium chloride, sucrose, sodium carboxymethylcellulose, and 5-aminolevulinic acid on the kiwifruit leaves. The concentration of calcium chloride in the mixture is 4.0 g / L, the concentration of sucrose is 10.0 g / L, the concentration of sodium carboxymethylcellulose is 5.0 g / L, and the concentration of 5-aminolevulinic acid is 10.0 mg / L. The spraying time of the mixture is the 7th day after completing step S1, the spraying times are 3 times, the spraying amount per time is 30 L per mu, the interval time between each spraying is 15 days, the spraying part is on the kiwifruit leaves, and the leaves include new leaves, mature leaves, and old leaves. The spraying method uses the method of spraying on both the front and back sides of the leaves until water droplets fall on both the front and back sides of all leaves.

[0042] Example 6

[0043] A method for improving the heat tolerance of kiwifruit leaves specifically includes the following steps: S1, pruning the kiwifruit tree body in summer. The pruning requirements are as follows: for the plants with a complete canopy, remove some branches in the overcrowded parts so that about 1 / 3 of the sunlight can penetrate the canopy; for the plants without a complete canopy, bind the vines to evenly disperse the branches on the kiwifruit trellis surface; S2, after step S1, spray a mixture of calcium chloride, sucrose, sodium carboxymethylcellulose, and 5-aminolevulinic acid on the kiwifruit leaves. The concentration of calcium chloride in the mixture is 4.0 g / L, the concentration of sucrose is 10.0 g / L, the concentration of sodium carboxymethylcellulose is 5.0 g / L, and the concentration of 5-aminolevulinic acid is 10.0 mg / L. The spraying time of the mixture is the 30th day after completing step S1, the spraying times are 2 times, the spraying amount per time is 30 L per mu, the interval time between each spraying is 20 days, the spraying part is on the kiwifruit leaves, and the leaves include new leaves, mature leaves, and old leaves. The spraying method uses the method of spraying on both the front and back sides of the leaves until water droplets fall on both the front and back sides of all leaves.

Claims

1. A method for improving the heat resistance of kiwifruit leaves, characterized in that: The following steps are involved: S1, pruning kiwifruit trees in summer; S2, after step S1, spraying a mixture of calcium chloride, sucrose, sodium carboxymethyl cellulose and 5-aminolevulinic acid on the leaves of kiwifruit.

2. A method for improving the heat resistance of kiwifruit leaves according to claim 1, characterized in that: The pruning requirements in step S1 are: for plants that have formed a complete crown, some branches in overcrowded areas are thinned out to the extent that sunlight can penetrate the crown; for plants that have not yet formed a complete crown, vines are tied up to make the branches evenly distributed on the kiwifruit rack surface.

3. A method for improving the heat resistance of kiwifruit leaves according to claim 1, characterized in that: The concentration of calcium chloride in the mixed solution in step S2 is 1.0 g / L to 10.0 g / L, the concentration of sucrose is 5.0 g / L to 50.0 g / L, the concentration of sodium carboxymethyl cellulose is 2.0 g / L to 20.0 g / L, and the concentration of 5-aminolevulinic acid is 5.0 mg / L to 30.0 mg / L.

4. A method for improving the heat resistance of kiwifruit leaves according to claim 1, characterized in that: The mixed solution in step S2 has a calcium chloride concentration of 3.0 g / L, a sucrose concentration of 10.0 g / L, a sodium carboxymethyl cellulose concentration of 5.0 g / L, and a 5-aminolevulinic acid concentration of 10.0 mg / L.

5. The method for improving the heat resistance of kiwifruit leaves according to claim 1, characterized in that: The mixed solution in step S2 is sprayed on the 5th to 45th day after step S1, the number of sprayings is 1 to 3 times, the amount of each spraying is 30.0 kg / mu to 60.0 kg / mu, and the interval between each spraying is 15 to 30 days.

6. A method for improving the heat resistance of kiwifruit leaves according to claim 1, characterized in that: The mixed solution in step S2 is sprayed on the 7th day after step S1, the number of spraying is 3 times, the spraying amount each time is 48.0 kg / mu, and the interval between each spraying is 25 days.

7. A method for improving the heat resistance of kiwifruit leaves according to claim 1, characterized in that: The spraying site of the mixed solution in step S2 is on the leaves of kiwi fruit, and the leaves include new leaves, mature leaves and old leaves.

8. The method for improving the heat resistance of kiwifruit leaves according to claim 1, characterized in that: The mixed liquid in step S2 is sprayed on both the front and back sides of the leaves until water drops fall on both the front and back sides of all leaves.

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