A cultivation method for cherry tomatoes resistant to heavy metal stress
By using grafting seedling cultivation and integrated cultivation techniques, the yield and quality problems of cherry tomatoes under heavy metal stress in existing technologies have been solved, achieving effective mitigation of heavy metals and improvement of selenium content.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- LIAONING UNIVERSITY
- Filing Date
- 2026-06-03
- Publication Date
- 2026-07-31
AI Technical Summary
Existing cultivation techniques for resisting heavy metal stress are designed for common tomato varieties and have not been specifically optimized for the growth habits, stress resistance characteristics, and fruit quality requirements of the 409 cherry tomato. Therefore, they are difficult to effectively alleviate the impact of heavy metal stress and cannot guarantee yield and quality.
A comprehensive approach combining grafting seedling technology with soil improvement, water and fertilizer management, heavy metal stress control, and pest and disease control was adopted. This included using peat moss, vermiculite, and perlite substrates for seedling cultivation, applying soil conditioners and heavy metal-resistant nutrients, and post-harvest treatment to enhance the heavy metal resistance of cherry tomatoes.
It significantly reduced the accumulation of heavy metals in the fruit, increased the selenium content in the fruit, and ensured the quality and yield of the fruit.
Smart Images
Figure CN122477899A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of fruit and vegetable cultivation technology, specifically relating to a cultivation method for cherry tomatoes resistant to heavy metal stress. Background Technology
[0002] Cadmium (Cd), a typical heavy metal pollutant, is highly toxic, difficult to degrade, and easily accumulates, posing a significant threat to human health. Due to its high mobility and ease of accumulation, cadmium readily deposits in soil, affecting plant growth, development, physiological metabolism, and jeopardizing plant quality and safety. Therefore, cultivating plants to tolerate heavy metal stress, enabling them to accumulate heavy metals with low or no accumulation, is crucial for meeting the needs of daily life.
[0003] Selenium (Se) is an essential component of glutathione peroxidase (GSH-Px) and plays a vital role in human health. Applying selenium fertilizer can promote plant growth, enhance antioxidant capacity, alleviate heavy metal toxicity, and reduce the content of heavy metals in plants. Simultaneously, selenium can mitigate the toxic effects of cadmium on plants by regulating the plant's antioxidant system, inhibiting cadmium absorption and transport, or reducing cadmium bioavailability, thus forming a selenium-cadmium antagonistic effect. This is of great significance for reducing cadmium pollution and cultivating cadmium-resistant plants.
[0004] Dandong 409 cherry tomatoes are a type of cherry tomato (Solanum lycopersicum var. cerasiforme). Native to South America, cherry tomatoes are an economically important crop used for both fruit and vegetable purposes. They have excellent flavor, are rich in nutrients, and possess high nutritional value and market potential. The fruit is rich in lycopene, vitamin C, polyphenols, flavonols, soluble sugars, and various amino acids. Lycopene and polyphenols, in particular, have strong antioxidant activity, providing excellent nutritional and health benefits.
[0005] Existing cultivation techniques for resisting heavy metal stress are mostly designed for common tomato varieties, without being specifically optimized for the growth habits, stress resistance characteristics, and fruit quality requirements of the 409 cherry tomato. These techniques are often singular and lack specificity, failing to effectively mitigate the impact of heavy metal stress on the 409 cherry tomato and thus unable to fully guarantee its yield and quality. Therefore, developing a targeted, easy-to-operate, and stress-resistant cultivation and field management technique that can effectively enhance the heavy metal resistance of the 409 cherry tomato and ensure fruit quality and yield is of significant practical importance and application value. Summary of the Invention
[0006] To address the technical problems existing in the prior art, the purpose of this invention is to provide a cultivation method for cherry tomatoes that are resistant to heavy metal stress. The cultivation method of this invention can enhance the cherry tomato plants' ability to resist heavy metal stress, reduce the accumulation of heavy metals in the fruit, and ensure fruit quality and yield.
[0007] To achieve the above-mentioned objectives, the technical solution adopted by this invention is: a cultivation method for cherry tomatoes resistant to heavy metal stress. The cultivation method includes: soil selection and pretreatment, grafting seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, harvesting and post-harvest management; the grafting seedling raising includes: taking peat moss, vermiculite and perlite, mixing them evenly, adding water, and adjusting the moisture content to 60%-70% by mass percentage to obtain a substrate; soaking cherry tomato seeds in water at 50℃-60℃ for 15min-20min, and then soaking them in water at room temperature for 6h-8h; sowing 1-2 soaked seeds in each hole of the substrate, and finally covering them with a 0.5cm-1cm thick layer of substrate. After the seedlings grow to 5cm-8cm, grafting the seedlings onto wild eggplant (Solanum melongena) Torubam rootstock for grafting seedling raising.
[0008] Furthermore, by mass ratio, peat moss:vermiculite:perlite = (3-5):(2-4):(2-4).
[0009] Furthermore, the soil selection and pretreatment include: selecting loam or sandy loam soil with flat terrain, good drainage, and pH=6.0-7.0, and controlling the soil cadmium content to <2.0mg / kg; deep plowing the soil to 25cm-30cm 15-20 days before transplanting, applying soil conditioner, mixing well, watering thoroughly, and covering with film and fumigating for 7-10 days.
[0010] Furthermore, the soil conditioner is composed of the following components by weight: 25-30 parts humic acid, 5-8 parts quicklime, 30-40 parts bio-organic fertilizer, 3-5 parts Bacillus subtilis inoculant, 5-8 parts biochar, and 2-3 parts seaweed extract.
[0011] Furthermore, the application rate of the soil conditioner is 50-80 kg / mu.
[0012] Furthermore, the planting includes: when the grafted seedling grows to 5-6 true leaves, transplanting the grafted seedling together with the rootstock into the pretreated soil, with a row spacing of 50cm-60cm and a plant spacing of 25cm-35cm; the planting depth is level with the cotyledons, and the seedling is thoroughly watered with a compound bacterial agent; in the root-fixing water, the compound bacterial agent: water ratio is 1:(500-800) by mass.
[0013] Furthermore, the heavy metal stress control includes: after transplanting, spraying the leaves with an anti-heavy metal nutrient agent four times during the mid-fruit setting, late-fruit setting, fruit enlargement, and color-changing stages of cherry tomatoes; the anti-heavy metal nutrient agent includes nano-selenium, calcium, magnesium, compound amino acids, potassium, and surfactants.
[0014] Furthermore, the composition of the anti-heavy metal nutrient is as follows: per liter of the anti-heavy metal nutrient contains 10mg-80mg of nano selenium, 5g-10g of calcium, 5g-10g of magnesium, 10g-20g of compound amino acids, 15g-25g of potassium, and 5g-10g of surfactant.
[0015] Furthermore, the harvesting and post-harvest management includes: harvesting when the fruit has a uniform color and soluble solids content ≥10%; soaking the fruit in a sodium bicarbonate solution with a mass percentage concentration of 0.5%-1.0% for 5-10 minutes after harvesting; and controlling the storage temperature at 8℃-12℃ and the relative humidity at 70%-80%.
[0016] Furthermore, the cherry tomato is 409 small tomato.
[0017] The beneficial effects of this invention are: by using the cultivation method of this invention, the accumulation of heavy metals in 409 cherry tomatoes is significantly reduced, while the selenium content in 409 cherry tomato fruits is significantly increased. Attached Figure Description
[0018] Figure 1 This is a comparative analysis of the cadmium content in the fruit of 409 cherry tomatoes grown using grafted seedling cultivation and those grown using traditional non-grafted seedling cultivation.
[0019] Figure 2 This is a graph showing the detection of total cadmium content in fruits obtained using the 409 cherry tomato grafting and seedling cultivation method of this invention.
[0020] Figure 3 This is a graph showing the detection of total selenium content in fruits obtained using the 409 cherry tomato grafting and seedling cultivation method of this invention. Detailed Implementation
[0021] The present invention will be further described in detail below with reference to specific embodiments. The embodiments are only used to explain the present invention and do not limit the scope of protection of the present invention.
[0022] Example 1: Cultivation method of 409 cherry tomato resistant to heavy metal stress
[0023] Cultivation methods include: soil selection and pretreatment, grafting and seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, and harvesting and post-harvest management. Specifically:
[0024] I. Soil Selection and Pretreatment:
[0025] 1. Preparation of soil conditioner:
[0026] The composition by weight is as follows: 26 parts humic acid, 7 parts quicklime, 35 parts bio-organic fertilizer, 4 parts Bacillus subtilis inoculant, 6 parts biochar, and 3 parts seaweed extract.
[0027] The preparation method includes: pulverizing humic acid, quicklime, bio-organic fertilizer and biochar to 80-100 mesh, mixing them, adding Bacillus subtilis inoculant and seaweed extract, adjusting the moisture content to 20%-25%, composting for 3-5 days, drying and pulverizing to obtain the final product.
[0028] 2. Select a flat, well-drained sandy loam soil with a pH of 6.0-7.0. The cadmium content of the sandy soil should be 1.71 mg / kg. Twenty days before transplanting, deeply cultivate the soil to a depth of 25-30 cm, apply soil conditioner at a rate of 70 kg / mu, mix well, water thoroughly, and cover with plastic film for 8 days.
[0029] II. Grafting and Seedling Propagation:
[0030] 1. Matrix preparation:
[0031] The ratio of peat moss:vermiculite:perlite is 4:3:3 by mass. Take peat moss, vermiculite and perlite, mix them evenly and add water. Adjust the moisture content to 60%-70% by mass percentage to obtain the matrix.
[0032] 2. Seed soaking:
[0033] Soak the 409 cherry tomato seeds in 55℃ water for 15-20 minutes, and then soak them in room temperature water for 6-8 hours.
[0034] 3. Sow 1-2 soaked seeds in each hole of the substrate, and then cover them with a 0.5cm-1cm thick layer of substrate.
[0035] 4. Grafting seedling cultivation:
[0036] Once the seedlings have grown to 5-8cm, they are grafted onto wild eggplant (Solanum melongena) Torubam rootstock for grafting seedling cultivation.
[0037] III. Planting:
[0038] When the grafted seedlings have grown to 5-6 true leaves, transplant them together with the rootstock into the pre-treated soil, with a row spacing of 50-60cm and a plant spacing of 25-35cm. The planting depth should be level with the cotyledons, and the seedlings should be thoroughly watered with a compound bacterial agent. Planting should be done on a sunny morning or a cloudy day.
[0039] For root establishment water, the ratio of compound bacterial agent to water is 1:700 by mass.
[0040] Pinch off the top 30-35 days after transplanting, retaining 3-4 lateral branches, and promptly remove old yellow leaves and deformed fruits; cultivate and loosen the soil every 30-40 days.
[0041] IV. Water and Fertilizer Management:
[0042] Water and fertilizer management shall be carried out in accordance with existing technologies.
[0043] Water management should follow the principle of small, frequent applications and alternating between dry and wet conditions, watering and draining only as needed. Water 3-5 days after transplanting to help the seedlings establish. From seedling establishment to flowering, water every 7-10 days (soil moisture content 60%-70%). From flowering and fruit setting to fruit expansion, water every 5-7 days (70%-80%). During the harvest period, water every 8-10 days (60%-70%). Stop watering 7-10 days before harvest. Drain water promptly during the rainy season to avoid water imbalance that could exacerbate the effects of heavy metal stress on the plants.
[0044] Fertilizer management focuses on organic fertilizers supplemented with nutrient solutions, with fertilizers applied in stages to promote seedling establishment, flowering, and fruit expansion.
[0045] V. Heavy Metal Stress Control:
[0046] 1. Preparation of anti-heavy metal nutrient:
[0047] Each liter of the anti-heavy metal nutrient solution contains 10mg of nano-selenium, 7.5g of calcium, 7.5g of magnesium, 15g of complex amino acids, 20g of potassium, and 8g of surfactant.
[0048] The preparation method includes: taking nano-selenium, calcium nitrate, magnesium sulfate, complex amino acids, potassium dihydrogen phosphate and surfactant, weighing them according to the ratio, adding water to dissolve and disperse them, and finally making up to 1L with water.
[0049] 2. After transplanting, apply an anti-heavy metal nutrient solution to the leaves of the 409 cherry tomatoes four times during the mid-fruit setting stage, late-fruit setting stage, fruit enlargement stage, and color change stage.
[0050] VI. Pest and Disease Control:
[0051] Pest and disease control should be handled using existing technologies. A combination of agricultural, physical, and biological control methods can be adopted, including removing diseased plant debris, implementing reasonable crop rotation, hanging yellow and blue sticky traps (20-30 traps per acre), using frequency-vibrating insecticidal lamps (5-10 lamps per acre), spraying biological pesticides, and using low-toxicity and easily degradable chemical pesticides when necessary.
[0052] VII. Harvesting and Post-Harvest Management:
[0053] Harvest the fruit when it has a uniform color and soluble solids content ≥10%. After harvesting, soak the fruit in a 0.5%-1.0% sodium bicarbonate solution for 5-10 minutes. Store the fruit at a temperature of 8℃-12℃ and a relative humidity of 70%-80%.
[0054] Example 2: Cultivation method of 409 cherry tomatoes resistant to heavy metal stress
[0055] Cultivation methods include: soil selection and pretreatment, grafting and seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, and harvesting and post-harvest management. Specifically:
[0056] I. Soil selection and pretreatment: Same as in Example 1.
[0057] II. Grafting and seedling cultivation: Same as in Example 1.
[0058] III. Planting: Same as in Example 1.
[0059] IV. Water and fertilizer management: Same as in Example 1.
[0060] V. Heavy Metal Stress Control:
[0061] Same as Example 1, except that the composition of the heavy metal nutrient is different:
[0062] Each liter of the anti-heavy metal nutrient solution contains 20mg of nano-selenium, 7.5g of calcium, 7.5g of magnesium, 15g of complex amino acids, 20g of potassium, and 8g of surfactant.
[0063] VI. Pest and disease control: Same as in Example 1.
[0064] VII. Harvesting and Post-harvest Management: Same as Example 1.
[0065] Example 3: Cultivation method of 409 cherry tomatoes resistant to heavy metal stress
[0066] Cultivation methods include: soil selection and pretreatment, grafting and seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, and harvesting and post-harvest management. Specifically:
[0067] I. Soil selection and pretreatment: Same as in Example 1.
[0068] II. Grafting and seedling cultivation: Same as in Example 1.
[0069] III. Planting: Same as in Example 1.
[0070] IV. Water and fertilizer management: Same as in Example 1.
[0071] V. Heavy Metal Stress Control:
[0072] Same as Example 1, except that the composition of the heavy metal nutrient is different:
[0073] Each liter of the anti-heavy metal nutrient solution contains 40mg of nano-selenium, 7.5g of calcium, 7.5g of magnesium, 15g of complex amino acids, 20g of potassium, and 8g of surfactant.
[0074] VI. Pest and disease control: Same as in Example 1.
[0075] VII. Harvesting and Post-harvest Management: Same as Example 1.
[0076] Example 4: Cultivation method of 409 cherry tomato resistant to heavy metal stress
[0077] Cultivation methods include: soil selection and pretreatment, grafting and seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, and harvesting and post-harvest management. Specifically:
[0078] I. Soil selection and pretreatment: Same as in Example 1.
[0079] II. Grafting and seedling cultivation: Same as in Example 1.
[0080] III. Planting: Same as in Example 1.
[0081] IV. Water and fertilizer management: Same as in Example 1.
[0082] V. Heavy Metal Stress Control:
[0083] Same as Example 1, except that the composition of the heavy metal nutrient is different:
[0084] Each liter of the anti-heavy metal nutrient solution contains 80mg of nano-selenium, 7.5g of calcium, 7.5g of magnesium, 15g of complex amino acids, 20g of potassium, and 8g of surfactant.
[0085] VI. Pest and disease control: Same as in Example 1.
[0086] VII. Harvesting and Post-harvest Management: Same as Example 1.
[0087] Example 5: Effects of cultivation methods for 409 cherry tomatoes resistant to heavy metal stress on selenium (Se) and cadmium (Cd) levels in the fruit.
[0088] I. Comparative Example 1 – Grafting Seedling Cultivation Method
[0089] Cultivation methods include: soil selection and pretreatment, grafting and seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, and harvesting and post-harvest management. Specifically:
[0090] 1. Soil selection and pretreatment: Same as in Example 1.
[0091] 2. Grafting and seedling cultivation: Same as in Example 1.
[0092] 3. Planting: Same as in Example 1.
[0093] 4. Water and fertilizer management: Same as in Example 1.
[0094] 5. Heavy metal stress control:
[0095] Same as Example 1, except that the composition of the anti-heavy metal nutrient is different: the anti-heavy metal nutrient does not contain nano-selenium.
[0096] Each liter of the anti-heavy metal nutrient solution contains 7.5g of calcium, 7.5g of magnesium, 15g of complex amino acids, 20g of potassium, and 8g of surfactant.
[0097] 6. Pest and disease control: Same as in Example 1.
[0098] 7. Harvesting and post-harvest management: Same as in Example 1.
[0099] II. Comparative Example 2 – Non-grafting Seedling Cultivation Method
[0100] Cultivation methods include: soil selection and pretreatment, seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, and harvesting and post-harvest management. Specifically:
[0101] 1. Soil selection and pretreatment: Same as in Example 1.
[0102] 2. Seedling raising:
[0103] 2.1) Matrix preparation: Same as in Example 1.
[0104] 2.2) Soaking: Same as in Example 1.
[0105] 2.3) Sow 1-2 soaked seeds per hole in the substrate, and then cover them with 0.5-1 cm of substrate. Do not graft; raise seedlings directly in the substrate.
[0106] 3. Planting:
[0107] Same as Example 1, except that when the seedlings have grown to 5-6 true leaves, the seedlings and substrate are transplanted into the pretreated soil.
[0108] 4. Water and fertilizer management: Same as in Example 1.
[0109] 5. Heavy metal stress control:
[0110] Same as Example 1, except that the composition of the anti-heavy metal nutrient is different: the anti-heavy metal nutrient does not contain nano-selenium.
[0111] Each liter of the anti-heavy metal nutrient solution contains 7.5g of calcium, 7.5g of magnesium, 15g of complex amino acids, 20g of potassium, and 8g of surfactant.
[0112] 6. Pest and disease control: Same as in Example 1.
[0113] 7. Harvesting and post-harvest management: Same as in Example 1.
[0114] III. Experimental Design
[0115] The experiment was conducted in a greenhouse in Longwangmiao Town, Dandong City, Liaoning Province from September 2025 to January 2026.
[0116] Randomly divided into five groups:
[0117] CK – Comparative Example 2 – Non-grafted seedling cultivation – Heavy metal nutrient solution contains 0 mg / L nano-selenium.
[0118] T0 – Comparative Example 1 Method – Grafting Seedling Cultivation – Heavy Metal Resistance Nutrient Contains Nano Selenium 0mg / L
[0119] T1—Example 1 Method—Grafting and Seedling Cultivation—The heavy metal nutrient contains 10 mg / L of nano selenium.
[0120] T2—Example 2 Method—Grafting Seedling Cultivation—The heavy metal nutrient contains 20 mg / L of nano selenium.
[0121] T3—Example 3 Method—Grafting Seedling Cultivation—The heavy metal nutrient contains 40 mg / L of nano selenium.
[0122] T4—Example 4 Method—Grafting Seedling Cultivation—The heavy metal nutrient contains 80 mg / L of nano selenium.
[0123] 1. Determination of total cadmium content
[0124] The determination of cadmium was based on inductively coupled plasma mass spectrometry (ICP-MS) according to GB 5009.15-2023, "National Food Safety Standard - Determination of Cadmium in Food".
[0125] 2. Determination of total selenium content
[0126] The determination of selenium was carried out according to the national standard GB / T 5009.93-2017 "National Food Safety Standard - Determination of Selenium in Food" by hydride atomic fluorescence spectrometry.
[0127] IV. Effects of grafting and non-grafting seedling cultivation methods on cadmium content in 409 cherry tomato fruits
[0128] like Figure 1As shown, in the T0 group (grafted seedling cultivation method), the cadmium content in the 409 cherry tomato fruit was 0.043 mg / kg, while in the CK group (non-grafted seedling cultivation method), the cadmium content in the 409 cherry tomato fruit was 0.2 mg / kg. Compared with the non-grafted seedling cultivation method, the cadmium content in the 409 cherry tomato fruit was reduced by 78.5% by the grafted seedling cultivation method. Therefore, the grafted seedling cultivation method is preferred in this invention.
[0129] V. Effects of selenium content in different heavy metal nutrient supplements on cadmium and selenium content in 409 cherry tomato fruits
[0130] like Figure 2 As shown, with the increase of selenium content in the anti-heavy metal nutrient, the cadmium content in 409 cherry tomato fruits showed a trend of first decreasing, then increasing and then decreasing again, but all of them were significantly lower than those in the T0 treatment group. In the T1 treatment group, the cadmium content reached the lowest value of 0.033 mg / kg.
[0131] like Figure 3 As shown, with the increase of selenium content in the heavy metal resistance nutrient, different concentration treatments significantly increased the total selenium content in 409 cherry tomato fruits. Moreover, the total selenium content in 409 cherry tomato fruits increased with the increase of foliar spray selenium concentration. The total selenium content of the fruits in the T4 treatment group reached the maximum value of 4.09 mg / kg, which was 6.9 times that of the T1 group (0.59 mg / kg) and 61.04 times that of the T0 treatment group (0.067 mg / kg).
[0132] During the experiment, the leaves of the T4 group showed mild selenium poisoning, with yellow spots appearing on the leaves. The biomass of the fruit was generally lower than that of the T3 group. Therefore, the T3 cultivation method is preferred in this invention, with a selenium concentration of 2.93 mg / kg in the fruit.
Claims
1. A method for cultivating cherry tomatoes resistant to heavy metal stress, characterized in that, The cultivation method includes: soil selection and pretreatment, grafting seedling raising, transplanting, water and fertilizer management, heavy metal stress management, pest and disease control, harvesting and post-harvest management; the grafting seedling raising includes: taking peat moss, vermiculite and perlite, mixing them evenly and adding water to adjust the moisture content to 60%-70% by mass percentage to obtain the substrate; soaking cherry tomato seeds in 50℃-60℃ water for 15min-20min, and then soaking them in room temperature water for 6h-8h; sowing 1-2 soaked seeds in each hole of the substrate, and finally covering them with 0.5cm-1cm of substrate. After the seedlings grow to 5cm-8cm, grafting the seedlings onto wild eggplant (Solanum melongena) Torubam rootstock for grafting seedling raising.
2. A method for cultivating cherry tomatoes resistant to heavy metal stress according to claim 1, characterized in that, By mass ratio, peat moss: vermiculite: perlite = (3-5): (2-4): (2-4).
3. The method for cultivating cherry tomato resistant to heavy metal stress according to claim 1, characterized in that, The soil selection and pretreatment include: selecting loam or sandy loam soil with flat terrain, good drainage, and pH=6.0-7.0, and controlling the soil cadmium content to <2.0mg / kg; deep plowing the soil to 25cm-30cm 15-20 days before transplanting, applying soil conditioner, mixing well, watering thoroughly, and covering with film and fumigating for 7-10 days.
4. The method for cultivating cherry tomato resistant to heavy metal stress according to claim 3, characterized in that, The soil conditioner is composed of the following components by weight: 25-30 parts humic acid, 5-8 parts quicklime, 30-40 parts bio-organic fertilizer, 3-5 parts Bacillus subtilis inoculant, 5-8 parts biochar, and 2-3 parts seaweed extract.
5. A method for cultivating cherry tomatoes resistant to heavy metal stress according to claim 4, characterized in that, The application rate of the soil conditioner is 50-80 kg / mu.
6. The method for cultivating cherry tomato resistant to heavy metal stress according to claim 1, characterized in that, The planting process includes: when the grafted seedlings have grown to 5-6 true leaves, transplanting the grafted seedlings together with the rootstock into the pretreated soil, with a row spacing of 50cm-60cm and a plant spacing of 25cm-35cm; the planting depth is level with the cotyledons, and the seedlings are thoroughly watered with a compound bacterial agent; the compound bacterial agent to water ratio is 1:(500-800) by mass.
7. The method for cultivating cherry tomato resistant to heavy metal stress according to claim 1, characterized in that, The heavy metal stress control includes: after transplanting, spraying the leaves with an anti-heavy metal nutrient agent four times during the mid-fruit setting, late-fruit setting, fruit enlargement, and color-changing stages of cherry tomatoes; the anti-heavy metal nutrient agent includes nano-selenium, calcium, magnesium, compound amino acids, potassium, and surfactants.
8. A method for cultivating cherry tomatoes resistant to heavy metal stress according to claim 7, characterized in that, The composition of the anti-heavy metal nutrient is as follows: per liter of the anti-heavy metal nutrient contains 10mg-80mg of nano selenium, 5g-10g of calcium, 5g-10g of magnesium, 10g-20g of compound amino acids, 15g-25g of potassium, and 5g-10g of surfactant.
9. A cultivation method for cherry tomatoes resistant to heavy metal stress according to claim 1, characterized in that, The harvesting and post-harvest management includes: harvesting when the fruit has a uniform color and soluble solids content ≥10%; soaking the fruit in a sodium bicarbonate solution with a mass percentage concentration of 0.5%-1.0% for 5-10 minutes after harvesting; and controlling the storage temperature at 8℃-12℃ and the relative humidity at 70%-80%.
10. A method for cultivating heavy metal-resistant cherry tomatoes according to any one of claims 1-9, characterized in that, The cherry tomatoes mentioned are 409 small tomatoes.