Blueberry-grape interplanting multilayer film greenhouse and planting method for regulating and controlling production period

Abstract

The invention discloses a blueberry-grape interplanting multilayer film greenhouse and a planting method for regulating and controlling the production period. Mainly through a blueberry-grape interplanting multilayer film greenhouse, space optimization, environment improvement and mature period regulation and control in a greenhouse blueberry-grape interplanting mode are realized. The greenhouse is 5.4 m in height, the outer layer of the greenhouse is covered with a heat preservation cotton quilt, the height of a second-layer film is 1.8-2.0 m, the height of a grape leaf curtain is 2.2-2.4 m, and the second-layer film is 40 cm below the grape leaf curtain (Figure 1). The blueberries and the grapes are planted by using root controllers, and 350 root controllers are arranged per mu (Figure 2); the grape leaf curtain is cultivated to shade the blueberries (figure 3). According to the method, the blueberries and the grapes are used for building the orchard at the same time, tree forms are rapidly cultivated in one year, the grapes form effective leaf curtains with the shading rate of 40%-50% in two years, and the shading requirement for growth of the blueberries in summer and autumn is met; the cost of purchasing and installing the sunshade net is saved, the space utilization rate of the greenhouse is increased, the combination of the sunshade net and the greenhouse is very suitable for urban agricultural development sightseeing picking, and economic benefits are remarkable.

Description

Technical Field

[0001] This invention belongs to the field of facility fruit tree planting technology, specifically involving a multi-layer film greenhouse for blueberry-grape intercropping and a planting method for regulating the production period. It is applicable to the three-dimensional planting of facility fruit trees and the optimization and regulation of the production period, and is especially suitable for urban sightseeing agriculture models. Background Technology

[0002] Blueberries are rich in anthocyanins, vitamins, and other nutrients, and market demand continues to grow. Greenhouse cultivation can advance blueberry maturity and improve quality, but it requires insulation in winter and spring to promote early ripening. High temperatures and strong sunlight in summer can easily cause leaf burn and reduce fruit quality, necessitating additional shading facilities and increasing planting costs. Grapes, as a common fruit tree, can have their production period flexibly controlled in greenhouse cultivation. Their canopy provides excellent shading once formed. If blueberries and grapes can be intercropped appropriately, greenhouse space can be fully utilized, using grape foliage to replace artificial shading, while simultaneously optimizing the production periods of both, avoiding harvesting conflicts, and improving economic benefits per unit area.

[0003] Existing intercropping techniques for fruit trees in protected environments often suffer from problems such as inefficient space utilization, overlapping production periods leading to management inconvenience, or improper shading control affecting fruit tree growth. Traditional intercropping models typically involve planting first and then establishing the orchard, but the long leaf canopy formation period for grapes makes it difficult to quickly provide effective shading for blueberries, hindering the balance between cost savings and increased efficiency. Furthermore, conventional greenhouses have a simple structure and cannot meet the temperature and light control requirements of the two fruit trees at different growth stages, restricting the widespread application of intercropping models. Therefore, developing an intercropping greenhouse and planting method that can optimize space utilization, precisely control production periods, quickly provide shading, and reduce planting costs has become an urgent need in the current field of protected fruit tree cultivation.

[0004] Meanwhile, according to a survey conducted by the Tianjin Forestry and Fruit Industry Technology System Innovation Team on intercropping of greenhouse grapes and greenhouse blueberries in Beijing, Tianjin, Hebei, and Liaoning, intercropping of greenhouse grapes in northern my country is currently mainly for fast-growing vegetables, while intercropping of greenhouse blueberries is virtually non-existent. Therefore, the Tianjin Forestry and Fruit Industry Technology System team has conducted years of technical research and development, proposing a multi-layered film greenhouse for blueberry-grape intercropping and a planting method for controlling the production period, effectively solving the aforementioned problems. Summary of the Invention

[0005] To address the problems of low space utilization, difficulty in production period control, high shading costs, long grape canopy formation cycle, and unreasonable canopy shading in existing technologies for intercropping fruit trees, this invention provides a multi-layer film greenhouse for blueberry-grape intercropping and a planting method for controlling the production period. By optimizing the greenhouse structure, rationally configuring planting parameters, and precisely controlling tree shape and production period, the invention achieves synergistic growth of blueberries and grapes, improves economic benefits per unit area, reduces planting costs, and is suitable for the needs of urban agritourism.

[0006] To achieve the above objectives, the present invention discloses the following technical solution: A multi-layered film greenhouse for blueberry-grape intercropping is disclosed. The greenhouse has a single-arch insulation structure with an overall height of 5.4m. The outer layer is covered with an insulation quilt for overall insulation during winter and spring, adapting to the overwintering and early spring growth needs of blueberries and grapes. Inside the greenhouse, two layers of plastic film are installed to separate the blueberries and grapes. The two layers of plastic film are 1.8-2.0m above the ground to divide the growth areas and regulate local temperature. In winter and spring, the blueberry area can be covered with the two layers of film to achieve insulation and promote early growth of blueberries.

[0007] The grape planting area is located above the two layers of plastic film. The grape canopy is cultivated to a height of 2.2-2.4m, and the two layers of plastic film are located 40cm below the grape canopy. This not only does not affect the growth of the grape vines, but also ensures that after the grape canopy is formed in summer, it provides uniform shade for the blueberries below, avoiding scorching of the blueberries by high temperature and strong sunlight.

[0008] Both blueberries and grapes in the greenhouse are planted using root control devices. The root control devices can limit excessive root growth, promote root coiling and fibrous root sprouting, enhance root absorption capacity, and facilitate precise water and fertilizer control in the later stages.

[0009] This invention further discloses a planting method for regulating the yield period of blueberry-grape intercropping. The method, based on the aforementioned multi-layer film greenhouse, optimizes temperature and light management by rationally configuring blueberry and grape varieties, planting density, and tree shape. This allows blueberries to ripen earlier than in conventional greenhouses, while grapes ripen after the blueberry harvest, ensuring a seamless transition between their production periods. Simultaneously, the grape foliage provides shade for the post-harvest blueberries. The specific steps are as follows: Step 1: Planting preparation and transplanting 1.1 Greenhouse pretreatment: Clean and level the ground inside the greenhouse.

[0010] 1.2 Root control device layout: Root control devices are laid out with a wide row spacing of 2.0m, a narrow row spacing of 1.2m, and a spacing of 1.2m. The root control devices are 1.5m away from the edge of the greenhouse, and there are about 350 root control devices per acre.

[0011] 1.3 Planting density: Select a density of 1 narrow row for each group of root control devices and leave a 2-1 gap between each group for planting grapes, and plant blueberries in the rest. In the end, about 290 blueberry plants and about 60 grape plants are planted per acre.

[0012] 1.4 Planting time: Blueberries and grapes are established at the same time. Planting should be done in spring before bud break. After planting, cover with mulch to keep warm and retain moisture, and promote seedling survival.

[0013] Step 2: Grapevine Shaping 2.1 Main stem training: After the grapes are planted, select one strong vine as the main vine in time, remove the other sprouts and side branches, and train the main vine to a height of 2.2m by trellising and training to form an upright main stem. During the training process, pay attention to fixing it to avoid breaking the vine.

[0014] 2.2 Fruiting Main Vine Cultivation: When the main vine grows to a height of 2.2m, pinch off the tip to promote the sprouting of lateral branches. Select two strong lateral branches as fruiting main vines and train them horizontally to both sides of the main trunk to cultivate them into horizontal fruiting main vines, ensuring that the fruiting main vines are evenly distributed and occupy the upper space.

[0015] 2.3 Fruiting branch group cultivation: One fruiting branch group is cultivated on one side of the main fruiting vine every 30-40cm to guide the growth of new fruiting shoots and form a grape leaf canopy with a height of 2.2-2.4m. Tree shape cultivation is completed one year after planting, and the leaf canopy volume meets the shading needs of blueberries in the second year.

[0016] 2.4 Tree management cycle: Using the above tree training method, the grape tree shape can be quickly established one year after planting, and the amount of grape leaves can reach the shading requirements for blueberry growth in the second year. There is no need to wait for the grape growth cycle, which shortens the time for the intercropping benefits to be recovered.

[0017] Step 3: Postpartum Management 3.1 Early Blueberry Management: In winter and spring, the temperature of the blueberry planting area is controlled to a suitable range for budding, flowering and fruiting by using an outer layer of insulating cotton quilt and a second layer of plastic film to keep warm. This promotes early budding and ripening of blueberries, allowing for harvesting 15-30 days earlier than open-field cultivation.

[0018] 3.2 Grape production period regulation: After blueberry harvest, remove the second layer of film, gradually adjust the temperature and light management of the greenhouse, regulate the covering time of the outer layer of heat insulation cotton quilt, optimize the temperature and light conditions for grape growth, promote grape flower bud differentiation and fruit development, ensure that the grapes mature after the blueberry harvest, avoid the conflict between the two harvests, and facilitate field management and picking operations.

[0019] 3.3 Postharvest Shading Management: After the blueberry harvest, the plant enters the postharvest growth stage. At this time, the grape canopy has fully formed. The grape canopy provides natural shade for the blueberries below, replacing artificial shade nets. This helps regulate the light intensity and temperature in the blueberry growing area, preventing high temperatures and strong sunlight from affecting the blueberry's postharvest recovery and flower bud differentiation. It also reduces the cost for growers to purchase, install, and dismantle shade nets.

[0020] Step 4: Integrated Field Management 4.1 Water and Fertilizer Management: Based on the root control device planting model, drip irrigation is used for precise water and fertilizer supply. Special fertilizers are applied according to the nutrient requirements of blueberries and grapes at different growth stages to avoid water and fertilizer waste and prevent soil compaction and root rot. During the blueberry growth period, acid fertilizer is added to adjust the soil pH value to suit the acid-loving characteristics of blueberries. During the grape growth period, the nitrogen, phosphorus and potassium ratio is emphasized, and potassium fertilizer is applied more during the fruit enlargement period to improve fruit quality.

[0021] 4.2 Pest and disease control: A combination of agricultural, physical, and biological control methods is adopted. Fallen leaves and weeds are cleared from the field to reduce the breeding of pests and diseases; insect-attracting lamps and sticky traps are hung to attract and kill phototactic pests; proper pruning is carried out to improve ventilation and light conditions and reduce the probability of disease occurrence; and low-toxicity biological pesticides are selected when necessary to ensure the safety of fruit quality.

[0022] 4.3 Pruning Management: After blueberry harvest, prune weak, diseased, dead, and overly dense branches in a timely manner to promote the sprouting of new shoots; during the grape growing season, prune regularly to remove buds, thin out overly dense new shoots and lateral shoots, and after fruit harvest, prune fruiting branches, retaining strong branches and vines to prepare for fruiting the following year.

[0023] This invention further discloses the application of multi-layer film greenhouses for blueberry-grape intercropping in grape and blueberry cultivation and in optimizing and controlling the production period. Experimental results show that blueberries mature 15-30 days earlier than those grown in open fields, and grapes mature 70-90 days after the blueberry harvest, achieving seamless production period coordination.

[0024] The advantages of the multi-layer film greenhouse for blueberry-grape intercropping and the planting method for regulating the production period disclosed in this invention compared with existing technologies are as follows: 1. Significantly improved space utilization: This invention adopts a multi-layer film greenhouse structure, which divides the blueberry and grape planting areas by two layers of plastic film. Blueberries are planted in the lower layer and grapes are planted in the upper layer, realizing three-dimensional intercropping. It makes full use of the 5.4m height space of the greenhouse. Compared with the single planting mode, the planting efficiency per unit area is increased by more than 30%.

[0025] 2. Precise and efficient production period control: By using a double-layer film for localized insulation and overall temperature and light control in the greenhouse, blueberries can ripen earlier, and grapes can ripen after the blueberries are harvested. The production periods of the two are smoothly connected, avoiding harvesting conflicts. At the same time, the fruit harvesting cycle in the facility is extended, which meets the needs of sightseeing and picking, and improves the stability of planting income.

[0026] 3. Significantly reduced planting costs: Grapes can form an effective canopy within a year of planting, replacing artificial shade nets for post-harvest blueberry shading. This eliminates the costs of purchasing, installing, dismantling, and recycling summer shade nets, reducing planting costs by 15%-20% annually. At the same time, the use of root control devices allows for precise water and fertilizer regulation, reducing water and fertilizer waste and further lowering planting costs.

[0027] 4. Suitable for urban agriculture development: Intercropping blueberries and grapes has a long fruit harvesting cycle and a good sightseeing and picking experience. At the same time, both are high-value-added fruit trees. Co-planting can improve the economic benefits and ornamental value of facility agriculture, which is suitable for the development needs of urban agriculture and has broad prospects for promotion and application.

[0028] 5. Excellent plant growth: The use of root control devices promotes root development and enhances the plant's absorption capacity; the precise control of the grapevine shape and the even distribution of the leaf canopy not only meet the needs of its own fruit development but also provide suitable shade for the blueberries. The two grow synergistically, improving fruit quality and yield. Attached Figure Description

[0029] Figure 1 Elevation diagram of multi-layer film greenhouse and grape foliage canopy; Elevation diagram of multi-layer film greenhouse and grape foliage canopy; 1. Insulation blanket; 2. Steel frame greenhouse and outer film; 3. Grape horizontal foliage canopy; 4. Second layer of film; 5. Root control device for planting blueberries and grapes; Figure 2 Top view of blueberry and grape planting rows; Figure 3 A side view diagram illustrating the grape canopy culture and its results. Detailed Implementation

[0030] The present invention will now be described through specific embodiments. Unless otherwise specified, all technical means used in this invention are methods well known to those skilled in the art. Furthermore, the embodiments should be understood as illustrative, not limiting, of the scope of the invention; the essence and scope of the invention are defined only by the claims. For those skilled in the art, various changes or modifications to the material composition and dosage in these embodiments without departing from the essence and scope of the invention also fall within the protection scope of this invention. Example 1

[0031] This embodiment provides a multi-layer film greenhouse for blueberry-grape intercropping and a planting method for controlling the yield period, as detailed below: 1. Greenhouse construction A single-arch insulated greenhouse was constructed, with a height of 5.4m. The arch frame was made of galvanized steel pipes, and the outer layer was covered with insulating cotton quilts. Inside the greenhouse, a second layer of plastic film was erected 1.9m above the ground. The second layer of plastic film was a drip-free film with a light transmittance of over 85%. The planned height of the grape leaf canopy was 2.3m, and the second layer of plastic film was located 40cm below the grape leaf canopy. The greenhouse was 50m long and 8m wide.

[0032] 2. Planting preparation and transplanting Clean the soil inside the greenhouse, plow to a depth of 35cm, and apply 2000kg / mu of well-rotted sheep manure, 50kg / mu of compound fertilizer, and 2kg / mu of borax. After leveling the land, install root control devices with a diameter of 50cm and a height of 40cm in the blueberry planting area and root control devices with a diameter of 60cm and a height of 50cm in the grape planting area.

[0033] For spring planting, the blueberry variety Sharpblue is selected from the Southern Highbush, using a wide-narrow row planting method with a wide row spacing of 2.0m, a narrow row spacing of 1.2m, and a plant spacing of 1.2m. The seedlings should be healthy one-year-old seedlings, and the planting depth should be level with the original soil mark. After watering thoroughly, cover with black mulch. For grapes, the early-ripening variety Summer Black is selected, with a plant spacing of 3.0m and a row spacing of 2.5m. The seedlings should be healthy one-year-old seedlings, and after planting, the main stem should be fixed with bamboo poles, watered thoroughly, and covered with transparent mulch.

[0034] 3. Grapevine training After the grapevines are planted, select one strong vine as the main vine, remove all other sprouts and lateral branches, and train the main vine to a height of 2.2m using bamboo poles, then pinch off the tip. After the lateral branches sprout, select two strong lateral branches as the main fruiting vines and train them horizontally to both sides of the main trunk. On the main fruiting vines, select one strong lateral branch every 35cm on each side to train them into fruiting branch groups, removing overly dense and weak lateral branches. After the new fruiting shoots sprout, thin out overly dense and weak shoots, retaining strong new shoots, and train and tidy them to form a grape canopy with a height of 2.3m. The tree shape is completed one year after planting, and the canopy size meets the shading needs of blueberries in the second year.

[0035] 4. Production period regulation and field management During the winter and spring seasons, from late November to February of the following year, the outer layer of insulating cotton quilt is used to cover the blueberry planting area at night and to open it for ventilation during the day. The second layer of plastic film completely covers the blueberry planting area to regulate the temperature of the blueberry planting area to 5-15℃ and promote early budding of blueberries. From March to April, when blueberries enter the flowering and fruit enlargement period, the temperature is regulated to 15-25℃ to improve the fruit setting rate and fruit quality. Finally, the blueberries are harvested in early May.

[0036] During the blueberry harvest (early to late May), the second layer of plastic film is gradually removed, and the temperature inside the greenhouse is controlled at 20-30℃ to provide suitable conditions for grape flower bud differentiation and fruit development. After the grapes enter the fruit enlargement stage, 15 kg / mu of potassium fertilizer is applied, and drip irrigation is used to maintain soil moisture at 60%-70%. Finally, the grapes are harvested in mid-June, achieving a connection between the blueberry and grape production periods.

[0037] After the blueberry harvest, use grape leaves to provide shade for the blueberries, and regulate the light intensity in the blueberry planting area to 5000-8000 lux and the temperature to 25-30℃ to promote the sprouting of new shoots and flower bud differentiation after harvest. In terms of water and fertilizer management, spray acidic foliar fertilizer once a month during the blueberry growing season to adjust the soil pH to 4.5-5.5. During the grape fruit enlargement period, drip irrigate once a week with a nitrogen, phosphorus and potassium ratio of 1:1:2.

[0038] Pest and disease control measures include hanging insect-attracting lamps and sticky traps, clearing fallen leaves and weeds from the field, and controlling gray mold, a disease caused by blueberries, using the biological pesticide iprodione for spraying; controlling downy mildew, a disease caused by grapes, using Bordeaux mixture for spraying to ensure the safety and quality of the fruit.

[0039] 5. Implementation Results In this embodiment, blueberries mature 25 days earlier than those grown in open fields, yielding 1200 kg per mu, while grapes yield 1000 kg per mu. The total output value per unit area is 80% higher than that of blueberry monoculture. There is no need to purchase or install shade nets, saving 3000 yuan per mu per year. The quality of blueberries and grapes is excellent, with blueberries having a 10% increase in anthocyanin content and grapes having a 18% soluble solids content, making them suitable for sightseeing and picking, resulting in significant economic benefits. Example 2

[0040] The difference between this embodiment and Embodiment 1 is that the height of the second layer of plastic film is 1.8m, the height of the grape canopy is 2.2m, the blueberry variety Bluecrop is selected from the northern highbush variety Bluecrop, and the grape variety Kyoho is selected from the mid-season variety. The rest of the greenhouse structure, planting parameters, tree shape cultivation and management methods are the same as in Embodiment 1.

[0041] The results showed that blueberries ripened and were harvested in mid-May, 18 days earlier than those grown in open fields, with a yield of 1,100 kg per mu; grapes ripened and were harvested in late June, with a yield of 900 kg per mu. The total output value per unit area increased by 75% compared to monoculture of blueberries, saving 2,800 yuan per mu in shade netting costs annually. The fruit quality met the standards and was suitable for facility planting and sightseeing picking needs. Example 3

[0042] Blueberries prefer diffused light and dislike direct sunlight and high temperatures. Under high temperatures and strong sunlight in summer, they are prone to problems such as leaf scorch, sunburn, decreased photosynthesis, deterioration of fruit quality, and root damage. Shading is a key management measure for blueberries in summer, and shading parameters and supporting management should be determined based on the variety, tree age, and cultivation method.

[0043] The necessity of summer shade for blueberries High temperature and strong sunlight areas: production areas where the temperature is consistently above 30°C in summer and the midday sunlight is above 80,000 lx.

[0044] Sensitive varieties: Northern highbush and half-highbush blueberries (with weak heat tolerance) require priority shading; Southern highbush and rabbiteye blueberries require moderate light shading. Specific tree conditions: 1-3 year old saplings, transplanted seedlings in the recovery period, and weak trees must be shaded; trees in the fruiting period should be shaded as needed.

[0045] 2. Key Shading Technical Indicators (1) Suitable shading rate Young trees: 50%–60%.

[0046] Results tree: 30%–40%.

[0047] (2) Shading period Core shade: 10:00-16:00.

[0048] Implementation period: early June to late August, gradually removing the barriers when the temperature drops below 30℃. Example 4

[0049] Comparative test A comparative experiment was conducted using conventional shoot density and the shoot density of this invention, as well as the horizontal leaf canopy of Eurasian and European / American grape varieties, to assess shading rates. This invention uses a European / American hybrid grape variety. As shown in Table 1, Eurasian grape varieties exhibit greater lateral shoot growth than European / American varieties, requiring more workers to manage these shoots and increasing costs. Therefore, this invention selects a European / American grape variety. Furthermore, experimental comparisons show that the spacing between conventional main fruiting vines (except for special tree shapes such as the H-shape, where the spacing between main fruiting vines is basically the same as the row spacing) is generally 2.0-2.5m, and the spacing between single-sided fruiting branch groups is generally 15-20cm. At this density, the shading rate of the leaf canopy during the new shoot growth period, the fruit tree development period, and after fruit harvest of planted European-American hybrid varieties is 50%, 65%, and 70%, respectively, which is greater than the light requirements of blueberries after fruit harvest. Therefore, this invention adjusts the spacing between main vines to 3.2m and the spacing between new shoots to 30-40cm according to the structure of the greenhouse. At this density, the shading rate of the leaf canopy during the new shoot growth period, the fruit tree development period, and after fruit harvest is 25%, 30%, and 40%, respectively, which basically meets the light requirements of blueberries after fruit harvest, and the effect is the best.

[0050]

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the technical solution of the present invention, and all such modifications and modifications shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A multi-layer film greenhouse for blueberry-grape intercropping, characterized in that: The main structure of the greenhouse is a steel-framed arched shed, 80-100m in length, 16-20m in span, and 5.4m in height. The steel arches are spaced 1m apart, and the supporting columns are spaced 3m apart. The outer plastic film is installed using film-pressing slots and covered with insulation blankets. The second layer of film is 1.8-2.0m high, and the grape foliage canopy is 2.2-2.4m high. The second layer of film is 40cm below the grape foliage canopy and is fixed with Φ1.0mm steel wire. The wire density is 1.0m spacing in the east-west direction and 2.0-3.0m spacing in the north-south direction. Plastic clips are used to fix the plastic film to the steel wires, leaving 2-3 plastic film joints in the north-south direction for ventilation and cooling during high temperatures.

2. A method for regulating the yield period of blueberry-grape intercropping based on the multi-layer film greenhouse described in claim 1, characterized in that... This includes the following steps: Step 1: Planting preparation and transplanting. Clear and level the greenhouse land. Install root control devices with a wide row spacing of 2.0m, a narrow row spacing of 1.2m, and a spacing of 1.2m between rows. The root control devices should be 1.5m away from the edge of the greenhouse. Install 350 root control devices per acre. Fill the root control devices with the prepared substrate. Plant grapes at a density of 1 row per group of narrow rows with a 2-1 gap between rows. Plant blueberries on the remaining rows. The final number of blueberry plants per acre should be approximately 290 and grape plants per acre. Plant the blueberries and grapes simultaneously. Step 2: Grapevine training. After planting, select one main vine and train it to a height of 2.2-2.4m to form the main trunk. Then train two fruiting main vines on both sides. On each side of the fruiting main vine, train one fruiting branch group every 30-40cm to guide the growth of fruiting shoots and form a grape canopy with a height of 2.2-2.4m. The training is completed one year after planting. In the second year, the amount of canopy will meet the shading needs of blueberries. Step 3: Production period regulation. In winter and spring, the two layers of plastic film and the outer layer of insulation cotton quilt are used together to keep warm and promote early ripening of blueberries. In summer and autumn, the temperature and light conditions of the greenhouse are regulated so that the grapes ripen after the blueberries are harvested. After the blueberries are harvested, the two layers of film are removed. In spring and summer, the greenhouse is used to regulate the grape production period. In summer and autumn, the grape leaves are used to provide shade for the blueberries. Step 4: Comprehensive field management, using drip irrigation or sprinkler irrigation for precise water and fertilizer control, combined with agronomic, physical and biological control measures to prevent and control pests and diseases, and regularly pruning blueberry and grape vines.

3. The planting method according to claim 2, characterized in that: In step 1, the planting time is selected before spring budding. Both blueberries and grapes are selected from healthy one-year-old seedlings. After planting, the root control device is covered with mulch to keep warm and retain moisture. The root control device for blueberries and grapes is 50-60cm in diameter and 40-50cm in height. The initial pH value of the blueberry planting substrate is 4.5-5.5, and the initial pH value of the grape planting substrate is 7.0-8.

0.

4. The planting method according to claim 2, characterized in that: In step 2, when the main vine reaches a height of 2.2m, it is pinched off, retaining two lateral shoots as fruiting main vines for horizontal cultivation. When the fruiting main vines of adjacent grapevines intersect and grow to a length of 1.8-2.0m, the fruiting main vine is pinched off again. Then, fruiting branch groups are cultivated on the fruiting main vines, with an interval of 30-40cm between fruiting branch groups on each side. In step 3, the temperature in the blueberry growing area is controlled at 5-25℃ in winter and spring to promote blueberry budding, flowering, and fruiting, while the temperature in the grape growing area is not limited. In spring, summer, and autumn, the temperature in the greenhouse area is controlled at 10-35℃ to coordinate with grape fruit development, normal blueberry growth, and flower bud differentiation. In summer and autumn, the grapes form an effective horizontal canopy with a shading rate of 40%-50%. Blueberries mature 15-30 days earlier than those grown in open fields, and grapes mature 70-90 days after the blueberry harvest, achieving a seamless production cycle.

5. The planting method according to claim 2, characterized in that: In step 4, blueberries need to be supplemented with acidic fertilizer during their growth period. The pH value of the fertilizer solution at the outlet of the fertilizer applicator should be 4.5-5, and the Ec value should be ≤1.0mS / cm. During the fruit enlargement period of grapes, potassium fertilizer can be applied separately to improve fruit quality.

6. The application of the multi-layer film greenhouse for blueberry-grape intercropping as described in claim 1 in grape and blueberry planting and production period optimization and control.

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