Green production technology of early and fast growing spring shoots of blueberry

Abstract

The application discloses a kind of blueberry early fast spring shoot green production technology, and relates to the technical field of fruit tree cultivation.The application solves the problem of blueberry dead fruit caused by the physiological shedding of old leaves and the non-occurrence of spring shoots.The application provides a kind of blueberry early fast spring shoot green production technology, which promotes the early occurrence of blueberry spring shoots, and the gradually mature functional leaves on the new shoots compensate for the insufficient nutrient supply caused by the physiological nutrient depletion of old leaves, ensuring the nutrient needs of blueberries during the middle and late stages of fruit setting, improving the yield and quality of blueberries, and also delaying the degree of senescence of old leaves.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fruit tree cultivation, more particularly to a green production technology for early promotion of fast spring shoots of blueberries. BACKGROUND

[0002] Blueberry is a common name for plants of the Vaccinium genus of the Ericaceae family. Most blueberries are deciduous, and a few are evergreen, and they are small shrubs. At present, the climate characteristics and cold requirement of blueberries are combined to successfully explore the ecological adaptability of different series of varieties (Xu Guohui et al. Analysis of global blueberry new variety characteristics and breeding trends in 2020 [J], China South Fruit Trees. 2022). Among the three major blueberry varieties, the southern highbush blueberry originated from the northern highbush and has stronger adaptability to soil. This series combines heat tolerance and low cold requirement genes (Sun Haiyue, et al. World Blueberry Breeding Overview. Northeast Agricultural University Journal 2014). After introduction to China, it was found that this series is more suitable for subtropical and temperate climates in Yunnan Province (Li Yadong, et al. 2021 Global Blueberry Industry Data Report. Journal of Jilin Agricultural University. 2022). The southern highbush blueberry produced in Yunnan is favored by consumers for its early maturity, good taste, excellent quality, and excellent flavor.

[0003] At present, fresh blueberries in China are almost produced in Yunnan, and the cultivation mode in Yunnan has also been transformed from the traditional mode to substrate cultivation, providing a stronger guarantee for stable quality. In recent years, the agricultural product traceability system based on blockchain technology can solve the consumer's trust crisis for blueberry products (Liang Zhujian. Research on the competitiveness improvement of YL Blueberry Company in Chengjiang City from the perspective of industrial clusters [D]. Kunming University of Science and Technology. 2021), which means that blueberries can be managed, controlled, visualized, and traceable from the field to the tongue. In such a transparent and safe consumption environment, it is necessary to work hard on the characteristics of blueberry varieties, innovate, promote, and apply good seeds and methods as an important measure to enhance the market competitiveness of the industry, and break through a batch of major key technologies suitable for the local climate based on this route.

[0004] China's blueberry industry has experienced a 40-year development process from scratch to five major production areas across the country. The industry has emphasized the key technical factors that determine the success of blueberry cultivation, such as blueberry variety selection, planting techniques, pruning methods, and fertilizer ratios. As technology matures, the planting industry is paying more attention to the quantity and quality of blueberry fruiting branches in autumn (Patent: A method for pruning blueberries to promote flowering. CN115039622A.2022). Fruiting branches are closely related to the cold requirement of blueberries. Research shows that northern highbush blueberry varieties generally require more than 800 hours of cold. In general, the subtropical and temperate climate conditions in Yunnan Province cannot meet the low-temperature cooling requirements for flower bud differentiation of northern highbush blueberries; while the cooling requirement of southern highbush blueberries is usually less than 300 hours (Yang Yuchun, et al. Research Progress on Physiological Characteristics and Chilling Requirements of Blueberries. Liaoning Agricultural Sciences. 2012). In Yunnan, simple rain shelters can be used to meet the planting needs of southern highbush blueberries without investing in large protected areas, and southern highbush blueberries can be put on the market earlier. Therefore, in recent years, Yunnan Province has mostly selected southern highbush blueberry varieties for development and production.

[0005] Yunnan's climate differs from that of northern China, with winter temperatures below 7.2°C appearing later and disappearing earlier. Poorly timed pruning can easily lead to underdeveloped vegetative and fruiting branches, impacting yield and quality in the following season. There are reports of trees still bearing a large number of immature fruits in late May that required pruning (Zeng Qilong et al., Pruning of Substrate-grown Blueberries. Fruit Farmers' Friends, 2020). After pruning, blueberry plants need to retrain their main branches and form a new crown to regain fruiting capacity. Initially, the quality of the new main branches is determined by nutrient delivery from the roots and the carbohydrate synthesis capacity of the leaves. Later, as the leaves on the new main branches mature into functional leaves, they acquire the ability to synthesize nutrients. The functional leaves on the new main branches not only influence the morphological development of the new main branches but also influence the quantity and quality of flowering and fruiting that year.

[0006] Because the volume of flowering and fruiting of the Southern High Cong series is very large, and the phenomenon of flowering and fruiting at the same time is common, in the middle and late stages of fruit ripening, these functional leaves on the new main branches gradually wither and fall off due to physiological nutrient depletion. At this time, the blueberry spring shoots have not yet occurred. Due to the obstruction of nutrient synthesis, the blueberries that set fruit in the later period do not get sufficient nutrition and become dead fruits, which seriously affects the blueberry yield and the health of the tree.

[0007] In order to solve the above technical difficulties, the present invention proposes a "green production technology for early and rapid spring shoots of blueberries", which aims to promote the early occurrence of spring shoots of blueberries, allowing the gradually mature functional leaves on the new shoots to make up for the insufficient nutrient supply caused by the physiological nutrient depletion of old leaves, and thereby obtain the following benefits: (1) providing energy guarantee for the normal growth and development of fresh blueberries; (2) significantly improving the effective fruiting rate of single blueberry plants, and significantly extending the effective picking time; (3) alleviating the nutrient consumption of the tree body, which is more conducive to the nutrition of the fruiting branches of the crown in the next production season. Summary of the Invention

[0008] In view of this, the object of the present invention is to provide a green production technology for early promotion and rapid growth of spring shoots of blueberries, the method having the following advantages: ① During the fruit development period, the generation of spring shoots is promoted without the use of hormones, thereby ensuring the food safety of fresh fruits; ② After the method promotes the growth of a large number of spring shoots, a large number of new leaves on the spring shoots make up for the deficiency of functional decline of old leaves, thereby promoting fruit development and nutrient accumulation; ③ The method effectively reduces the fruit drop rate and improves the yield and quality of blueberries; ④ The method shortens the fruit ripening cycle, thereby ensuring that there are mature fresh fruits from early February to early May of the following year; ⑤ The method has the advantages of simple principle, easy operation, distinct characteristics, and can effectively improve the cultivation quality.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] A green production technology for blueberry to promote early and rapid spring shoot growth, specifically comprising: (1) cultivation of new main branches, (2) adjustment of tree structure, (3) management of fruiting branches, (4) auxiliary layer fences, (5) warming in winter and spring to promote flowering, (6) promoting spring shoot growth, and (7) auxiliary fertilization technology to promote spring shoot growth.

[0011] Preferably, in the green production technology for promoting early and rapid spring shoot growth of blueberries, the typical characteristics of the blueberry varieties tested are that they are southern highbush blueberry varieties whose spring shoots have not yet sprouted during the initial fruit ripening period; the cultivation technology adopts a substrate pot cultivation model; the blueberries selected are blueberries that are more than 5 years old and the selected blueberries must be able to quickly grow fruiting branches after heavy pruning after fruiting, without affecting flowering and fruiting in the second year.

[0012] Preferably, the cultivation of the new main shoots comprises:

[0013] In mid-May, all immature blueberry fruits on the fruit trees should be knocked off. After knocking off the fruits, fertilize in time to supplement nutrients so that the photosynthetic products synthesized by the leaves flow back to the roots for nutrient storage. 7-10 days after fertilization, the blueberries should be cut flat and pruned. After the cut and pruned, the newly sprouted branches will become the new main branches.

[0014] After the fruit is knocked, the nutrition is supplemented in time, specifically: the last regular fertilization is changed into 1.5‰ diammonium phosphate water soluble fertilizer, 300g per 667m2, and the subsequent fertilization still uses balanced water soluble fertilizer;

[0015] 7-10 days after fertilization, blueberry is pruned, which is to cut off the one-year-old branches to stimulate the new main branches to grow from the branches below the pruning point;

[0016] After pruning, the newly sprouted branches are the new main branches, and the number of new main branches is determined according to the production needs, usually 2-4 basal branches per flowerpot, and 4-5 new main branches per basal branch.

[0017] Preferably, the regulation of tree structure comprises:

[0018] In mid-June to early July, when the top growth point of the new main branch appears black tip phenomenon, it indicates that the new main branch is no longer developing, and this period is the key period for regulating tree structure, and pinching or shortening should be taken in time.

[0019] The main purpose of pinching or shortening is to remove the top dominance of each new main branch to ensure that a certain number of lateral branches grow on each new main branch.

[0020] Whether to pinch or shorten depends on the nutritional development status of the new main branch, and the standard is to keep the new main branch strong and highly lignified, and the length can be controlled within 15-30cm.

[0021] Pinching or shortening will stimulate the main branch to grow lateral branches, and thus the new main branch and the lateral branches growing on it constitute the basic unit of the blueberry tree structure.

[0022] Preferably, the management of the fruiting branch group comprises:

[0023] In early August to late September, after the new main branch is pinched or shortened, the newly sprouted lateral branches will develop into different types of branches, which can be divided into long branches (length greater than 20cm), medium branches (length between 10-20cm), and short branches (length less than 10cm), and some branches will also grow secondary lateral branches during development, which together constitute the fruiting branch group of blueberry.

[0024] In the daily management process, different types of branches in the fruiting branch group should be managed differently, and when the length of the lateral branches reaches 19-21cm, the phenotypic changes of the branches should be observed and classified and managed accordingly, which is described as follows:

[0025] ① 19-21cm's branch due to natural black tip and the axis of growth, this kind of branch will generally be in the axis of growth point below the occurrence of secondary lateral branch, to reach the standard result branch, keep natural growth can;

[0026] ② 19-21cm's branch does not appear natural black tip, and still in the growth, wait for the branch to grow to 30cm or so, the middle and lower part presents lignification, semi lignification after, in 15-20cm place to the branch implement short cutting, promote the side branch grow below the cutting;

[0027] ③ 20cm below some branches, can refer to the regular pruning method of fruit trees to decide to keep or cut.

[0028] The auxiliary level guardrail is specifically introduced as follows.

[0029] In the blueberry substrate potting mode, in order to prevent the occurrence of blueberry head heavy foot light lodging phenomenon, also in order to the realization of the subsequent key technology involved in "pulling branch, traction, hitting sharp" to promote spring shoot, it is necessary to erect "feng" shaped support along the center line of the substrate potting tree in horizontal row.

[0030] The "feng" shaped support is composed of column, crossbar and gardening support line. First, fix 3 layers of crossbar on the column, then erect "feng" shaped support along the center line of the flowerpot, when erecting, use piling way to fix the one end of the column into the soil, the lower, middle and upper layers of crossbar are respectively 60cm, 90cm and 110cm away from the ground, adjust the height between crossbar and ground, then symmetrically pull two gardening rubber support lines on both sides of the column, fix the lines on the crossbar, the rubber support lines should be taut and straight, which is convenient for fixing branches in later period.

[0031] The winter and spring season temperature rising to promote flower includes:

[0032] Winter temperature rising to promote early flowering is to take a series of artificial intervention measures on blueberry on the basis of fully understanding the cold requirement of the variety, the purpose is to let blueberry flower and bear fruit in advance, to promote the time of listing, to improve economic benefit.

[0033] Under the premise of fully understanding the cold requirement of the variety, the cold requirement of a single production season can be obtained by means of small weather station every hour, when the cumulative hours of ≤7.2℃ temperature reaches the cold requirement of the variety, in order to achieve the purpose of artificial regulation of flowering time, the blueberry can be carried out in time to carry out smothering and temperature rising;

[0034] After smothering, the daily average temperature in the shed should be raised to more than 10℃ as soon as possible, if only smothering can not achieve the effect of temperature rising, auxiliary temperature rising can be carried out in the shed by charcoal fire;

[0035] When using charcoal fire to assist in heating, the charcoal fire should not be too close to the blueberry cultivation container to prevent the charcoal from burning the blueberry tree. The density of the charcoal fire depends on the temperature regulation in the greenhouse. In principle, the temperature should rise slowly in the first 10 days of heating, so that the daily average temperature is slightly higher than 10℃. After 10 days, the density of the charcoal fire should be appropriately increased to keep the temperature in the greenhouse between 10℃-20℃.

[0036] When the effective accumulated temperature in the greenhouse reaches ≥10℃ and reaches a certain level, the blueberries will gradually bloom under the conditions of warming in the greenhouse.

[0037] Described spring shoot promotion specifically comprises:

[0038] Continue to keep the greenhouse in a stuffy state. When the first batch of flowers in the greenhouse are in full bloom, implement the following agricultural operations on the blueberry flowering and fruiting branches to promote the early emergence of spring shoots;

[0039] 1. Pull the flowering and fruiting branches: Use bindings to fix the top of the flowering and fruiting branches on the gardening rubber-wrapped support line at a height similar to that of the main branches;

[0040] 2. Pull the flowering and fruiting branches: After the top of the flowering and fruiting branches is fixed, tie a rope at the fork of the branch group, and tie the other end of the rope to the 110cm gardening rubber-coated support line for pulling, so that the branches are parabolic as a whole;

[0041] 3. Tip the flowering and fruiting branches: After pulling all the flowering and fruiting branches, tip the parabolic flowering and fruiting branches to remove the apical dominance and stimulate the leaf buds at the lower end of the branches to sprout and produce spring shoots;

[0042] 4. Reset the flowering and fruiting branch groups: When the spring shoots grow to 3cm-5cm in length and most of the spring shoots have more than 5 complete functional leaves, remove the traction ropes and rubber-coated support wires used for pulling branches to restore the branches to their natural stretched state.

[0043] The auxiliary spring shoot fertilization technology comprises:

[0044] After the topping operation is completed, change the last balanced water-soluble fertilizer to a water-soluble high nitrogen fertilizer with a nitrogen, phosphorus and potassium ratio of 30:10:10 and a concentration of 1.5‰ per 667m 2 Use 300g.

[0045] It can be seen from the above technical solutions that compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. Provide energy guarantee for the normal growth and development of fresh blueberries;

[0047] 2. The effective fruiting rate of blueberry plants has been significantly improved, and the effective picking time has been significantly extended;

[0048] 3. It alleviates the nutrient consumption of the tree and is more conducive to the nutrition of the fruiting branches of the crown in the next production season. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0050] Figure 1 The present invention provides photos of field effects of a green production technology for early promotion and rapid growth of spring shoots of blueberries. DETAILED DESCRIPTION

[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0052] Example 1

[0053] Example 1 is an example of the method of the present invention, the test variety is Eureka, and the specific implementation method is as follows:

[0054] On May 22, 2021, all the fruits on the blueberry trees were picked at one time, regardless of whether the fruits were ripe or not. For 10 days after the fruit harvest, the trees were not treated in any way, allowing the photosynthetic products synthesized by the leaves to flow back to the roots for nutrient storage.

[0055] On June 2, 2021, the tree was pruned and all annual branches were cut off.

[0056] For the first fertilization after June 2, 2021, change the balanced water-soluble fertilizer to 1.5‰ diammonium phosphate water-soluble fertilizer, using 300g per 667㎡ each time. Balanced water-soluble fertilizer will still be used for subsequent fertilization.

[0057] After heavy pruning, under the natural environment of high temperature and high humidity, the latent buds on the branches below the cut will easily sprout new leaves and side branches will grow at the axillary buds.

[0058] For the newly sprouted leaves and side branches, follow the records in the cultivation of the new main branches above, and leave enough suitable branches in each pot to serve as the fruiting branches for the next year. The excess side branches should be removed as early as possible, as small as possible, and removed completely. When removing excess side branches, the new leaves at the axillary buds should be retained as much as possible to provide photosynthetic products for the growth and development of blueberry fruit in the next year.

[0059] After completing the above steps, subsequent agricultural operations are carried out according to the techniques of adjusting tree structure, managing fruiting branches, auxiliary layer guardrails, raising temperatures in winter and spring to promote flowering, promoting spring shoots, and auxiliary fertilization to promote spring shoots as recorded in the invention content.

[0060] Example 2

[0061] Example 2 is a control example, which is a conventional planting example without promoting spring shoots.

[0062] Example 2 does not perform the operating steps of the auxiliary hierarchical guardrail, spring shoot promotion and auxiliary spring shoot promotion fertilization technology in the invention content. The remaining cultivation techniques are exactly the same as those in Field Management Example 1 and will not be repeated.

[0063] The present invention collects data on indicators such as the number of sprouting branches, the number of fruiting branches, the total number of fruits set, the number of effective fruits picked in batches, the number of immature fruits, the fruit harvest rate, the number of old leaves, the number of newly grown spring shoots, and the number of functional leaves on the spring shoots for single pots of different embodiments. The data are recorded in Tables 1 and 2 below.

[0064] Table 1

[0065]

[0066] Table 2

[0067]

[0068] As can be seen from Table 1 and Table 2, the number of sucker branches in each single pot of Example 1 and Example 2 is 3, and the number of fruiting branches cultivated after heavy pruning is 27. The initial growth potential of the two examples is comparable. From the perspective of the total number of fruits set, Example 1 is 2978 and Example 2 is 3063. The difference in the number of fruits set between Example 1 and Example 2 is 85, which is not very large.

[0069] Both Examples 1 and 2 began their first fruit harvest on February 10th, with subsequent harvests occurring every 10 days. Example 1 harvested 9 times throughout the blueberry season, with fresh fruit available from February 10th to May 1st, for a total of 80 days. Example 2 harvested 6 times throughout the season, with fresh fruit available from February 10th to April 1st, for a total of 50 days. Example 1 significantly extended the fresh fruit supply period by 30 days.

[0070] The number of fruits set in Example 1 is 2978, the number of effective fruits picked is 2841, the number of invalid fruits is 137, and the fruit harvesting rate is 95.4%; the number of fruits set in Example 1 is 3063, the number of effective fruits picked is 1979, the number of invalid fruits is 1084, and the fruit harvesting rate is 64.6%.

[0071] On February 10, Example 1 and Example 2 had 93 and 111 old leaves respectively. By March 22, Example 1 still had 51 old leaves, while Example 2 had only 27 old leaves.

[0072] By March 22, the number of newly grown spring shoots in Example 1 and Example 2 were 102 and 14, respectively, and the number of functional leaves on the spring shoots were 432 and 48, respectively.

[0073] Through analysis of the above results, the core of the green production technology for early and rapid spring shoot growth of blueberries disclosed in the present invention lies in performing operations such as pulling, traction, and topping on each flowering and fruiting branch, thereby removing apical dominance and promoting the growth of lateral branches at an early stage. The gradually maturing functional leaves on the spring shoots provide the nutritional needs of blueberries in the middle and late stages of fruit setting, alleviating the contradiction between nutritional deficiency and the healthy growth and development of blueberries, improving the yield and quality of blueberries, and delaying the aging of old leaves.

[0074] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0075] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A green production technology for early and rapid spring shoot growth of blueberries, characterized in that: include: (1) Cultivation of new main branches, (2) Adjustment of tree structure, (3) Management of fruiting branches, (4) Auxiliary layer fences, (5) Warming up in winter and spring to promote flowering, (6) Promoting spring shoots, (7) Auxiliary fertilization techniques to promote spring shoots; The cultivation of the new main shoot comprises: In mid-May, all immature blueberry fruits on the fruit trees should be knocked off. After knocking off the fruits, fertilize in time to supplement nutrients so that the photosynthetic products synthesized by the leaves flow back to the roots for nutrient storage. 7-10 days after fertilization, the blueberries should be cut flat and pruned. After the cut and pruned, the newly sprouted branches will become the new main branches. The described spring shoot promotion comprises: Continue to keep the greenhouse in a sealed state. When the first batch of flowers in the greenhouse are in full bloom, perform the following agricultural operations on the blueberry flowering and fruiting branches:

1. Pull the flowering and fruiting branches: Use bindings to fix the top of the flowering and fruiting branches on the gardening rubber-wrapped support line at a height similar to that of the main branches; 2. Pull the flowering and fruiting branches: After the top of the flowering and fruiting branches is fixed, tie a rope at the fork of the branch group, and tie the other end of the rope to the 110cm gardening rubber-coated support line for pulling, so that the branches are parabolic as a whole; 3. Tip the flowering and fruiting branches: After pulling all the flowering and fruiting branches, tip the parabolic flowering and fruiting branches to remove the apical dominance and stimulate the leaf buds at the lower end of the branches to sprout and produce spring shoots; 4. Reset the flowering and fruiting branches: When the spring shoots grow to 3cm-5cm and most of them have more than 5 complete functional leaves, remove the traction ropes and rubber-coated support wires used for pulling branches to restore the branches to their natural stretch state; The auxiliary spring shoot promotion fertilization includes: after the spring shoot promotion operation, adjusting the most recent balanced water-soluble fertilizer to a water-soluble high-nitrogen fertilizer, with a nitrogen, phosphorus and potassium mass ratio of 30:10:10, a concentration of 1.5%, and 300g per 667㎡.

2. A green production technology for early and rapid spring shoot growth of blueberries according to claim 1, characterized in that: The blueberries are southern highbush blueberries that are more than 5 years old, and the blueberries can quickly produce fruiting branches by heavy pruning after fruiting, without affecting flowering and fruiting in the second year; the production technology adopts a substrate pot cultivation model.

3. A green production technology for early and rapid spring shoot growth of blueberries according to claim 2, characterized in that: The fertilization and nutrition supplementation are as follows: the most recent conventional fertilization is changed to 1.5‰ diammonium phosphate water-soluble fertilizer, 300g per 667m2 each time, and balanced water-soluble fertilizer is used for subsequent fertilization.

4. The green production technology for early and rapid spring shoot growth of blueberries according to claim 1, characterized in that: The adjusting tree structure includes: In mid-June to early July, when black tips appear at the top growth points of new main branches, pinching or pruning should be carried out in a timely manner.

5. The green production technology for early and rapid spring shoot growth of blueberries according to claim 1, characterized in that: The management of the fruiting branch group includes: In the daily management process, different management measures are adopted for different branch types in the fruiting branch group. When the length of the side branches reaches 19-21cm, the phenotypic changes of the branches are observed and targeted classification management is carried out. The specific details are as follows: ① The branches of 19-21cm will rotate due to the natural black tips, so just keep growing naturally; ② If the branches between 19 and 21 cm do not have natural black tips and are still growing, when they grow to 29 to 31 cm and the lower and middle parts become lignified or semi-lignified, cut them back at 15 to 20 cm to encourage the growth of side branches below the cut. ③For branches below 20cm, refer to the conventional pruning methods for fruit trees to decide whether to keep or cut them off.

6. The green production technology for early and rapid spring shoot growth of blueberries according to claim 1, characterized in that: The auxiliary hierarchical guardrail includes: A cross-shaped bracket is erected along the center line of the substrate potted trees arranged in a row; The cross-shaped bracket is composed of columns, crossbars, and horticultural support lines. Specifically: First, fix 3 layers of crossbars on the columns, then erect the cross-shaped bracket along the center line of the flower pots, fix one end of the column in the soil by driving piles, adjust the height between the crossbars and the ground according to the lower, middle, and upper 3 layers of crossbars being 60 cm, 90 cm, and 110 cm from the ground respectively, and then symmetrically pull two horticultural rubber-coated support lines on both sides of the column and fix the lines on the crossbars.

7. The green production technology for promoting early spring shoot growth of blueberries according to claim 1, characterized in that: The temperature increase and flower promotion in winter and spring include: With the help of the hourly temperature of a small weather station, judge whether the selected local climate conditions have met the chilling requirement of the variety used. After meeting the conditions and combined with the production needs, seal the greenhouse and raise the temperature. After sealing the greenhouse, make the daily average temperature in the greenhouse rise above 10°C. In the first 10 days of temperature increase, the temperature increase should be gentle, making the daily average temperature slightly higher than 10°C. After 10 days, make the temperature in the greenhouse between 10°C and 20°C.

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