Wild blueberry cultivation method
By adjusting the soil pH and combining it with light or heavy pruning, the problems of dense wild blueberry plants and insufficient sunlight were solved, which increased the polyphenol and flavonoid content and single fruit weight, thus promoting the sustainable use and economic value of wild blueberries.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- NORTHEAST FORESTRY UNIV
- Filing Date
- 2026-03-31
- Publication Date
- 2026-05-12
AI Technical Summary
In existing technologies, wild blueberry plants are densely packed with branches and the fruiting parts receive insufficient sunlight, resulting in low fruit set rate, small fruit size, and uneven quality. There is a lack of systematic pruning intervention methods to improve yield and quality.
By adjusting the soil pH to 4.0≤pH≤5.0 and pruning wild blueberries with light or heavy pruning methods, diseased, weak, or unfavorable fruiting branches can be removed to increase the polyphenol and flavonoid content or single fruit weight of the fruit.
Without affecting vegetation regeneration, the intrinsic quality and fruit set rate of wild blueberries can be significantly improved, thus realizing the sustainable utilization and economic value of wild blueberries.
Smart Images
Figure CN122004084A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of fruit tree pruning and cultivation management technology, and in particular to a method for cultivating wild blueberries. Background Technology
[0002] Blueberries, also known as bilberries or blueberries, are perennial berry-bearing shrubs belonging to the genus Vaccinium in the family Ericaceae. The berries are deep blue, nearly round, and covered with a bloom. Blueberries are rich in anthocyanins, flavonoids, phenolic acids, and other bioactive components and nutrients, and are listed by the Food and Agriculture Organization of the United Nations as one of the five healthiest foods for humans.
[0003] Abundant wild blueberry resources are distributed in Northeast China and the Greater Khingan Mountains region, presenting promising development prospects. Blueberry yield and fruit quality are influenced by various cultivation factors, among which soil pH and pruning intensity are two key controllable factors. However, wild blueberries suffer from problems such as dense vines, crowded branches, and insufficient sunlight for fruiting areas, resulting in low fruit set, small fruit size, and uneven quality, thus limiting their industrial utilization. While some cultivation and pruning experience has been applied to artificial blueberry cultivation, optimization is usually focused on pH or pruning alone. There is a lack of systematic pruning intervention methods for wild blueberry bushes, particularly in achieving quality improvement and sustainable resource utilization under natural distribution conditions, which remains a gap in understanding. Summary of the Invention
[0004] To address the aforementioned problems, this invention provides a cultivation method for wild blueberries. This method involves adjusting soil pH and implementing control measures based on different pruning intensities. This significantly improves the intrinsic quality indicators of the fruit (polyphenol and flavonoid content) while maintaining acceptable yields, or provides corresponding pruning strategies when single fruit weight is the primary target. When pH 4.0 ≤ pH < 4.5 and light pruning is used, the polyphenol and flavonoid content of the fruit reaches the highest levels observed in the experiment. However, when single fruit weight is the primary target, a higher single fruit weight can be obtained when pH 4.0 ≤ pH < 4.5 and heavy pruning.
[0005] To achieve the above objectives, the present invention provides the following technical solution: This invention provides a method for cultivating wild blueberries, comprising the following steps: The pH value of the soil for wild blueberries is stabilized at 4.0≤pH≤5.0. During the same growing season, a pruning method is selected to prune the wild blueberries according to the cultivation purpose. The pruning method is either light pruning or heavy pruning. Light pruning and heavy pruning are two independent pruning methods, and either one can be selected for implementation during the same growing season. The light pruning is carried out at the initial flowering stage of wild blueberries. The pruning standard is to remove diseased, weak, and overly dense branches, with the amount of branches removed accounting for 10% to 20% of the total number of branches throughout the year, preferably 15%.
[0006] The heavy pruning is carried out during the fruiting period of wild blueberries. The pruning standard is to remove old branches and unfavorable fruiting branches, and the amount of branches removed accounts for 30% to 40% of the total number of branches throughout the year, preferably 35%.
[0007] Preferably, when improving the quality of wild blueberries, the pH value of the soil where wild blueberries grow is stabilized at 4.0≤pH<4.5, and the wild blueberries are lightly pruned at the initial flowering stage, preferably removing 15% of the total number of branches throughout the year.
[0008] Preferably, the quality indicators include polyphenols and / or flavonoids.
[0009] Preferably, when increasing the single fruit weight of wild blueberries, the pH value of the soil for wild blueberries is stabilized at 4.0≤pH<4.5, and the wild blueberries are heavily pruned during the fruiting period, preferably removing 35% of the total number of branches throughout the year.
[0010] Preferably, when restoring wild blueberry plants, the pH of the soil for wild blueberries is stabilized at 4.5≤pH≤5.0, and the wild blueberries are lightly pruned at the initial flowering stage, preferably removing 15% of the total number of branches throughout the year.
[0011] Preferably, the pH value is adjusted by applying sulfur powder or calcium carbonate.
[0012] The beneficial effects of this invention are: 1. Easy to operate, suitable for outdoor natural conditions, and requires no complicated equipment; 2. It can improve the marketability and nutritional quality of fruits without affecting vegetation regeneration; 3. Promoting the sustainable use of wild blueberries has dual benefits of ecological restoration and economic value. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below.
[0014] Figure 1 This is a schematic diagram of the trimming process of the present invention. The red part indicates the trimming area, and the area inside the dashed box indicates the part removed by trimming. A represents no trimming, B represents light trimming, and C represents heavy trimming. Figure 2 Figures showing the growth changes of blueberry plants after different pruning treatments; Figure 3 This is a graph showing the changes in average fruit diameter and single fruit weight. Detailed Implementation
[0015] This invention provides a method for cultivating wild blueberries, comprising the following steps: stabilizing the pH value of the soil for wild blueberries at 4.0≤pH≤5.0; performing light pruning on wild blueberries during the initial flowering stage or heavy pruning on wild blueberries during the fruiting stage; the standard for light pruning is: removing diseased, weak, and overly dense branches, with the amount of branches removed accounting for 10-20% of the total number of branches in the year, preferably 15%; the standard for heavy pruning is: removing old branches and branches that are not conducive to fruiting, with the amount of branches removed accounting for 30-40% of the total number of branches in the year, preferably 35%.
[0016] In this invention, to improve the quality of wild blueberries, the pH value of the soil is stabilized at 4.0 ≤ pH < 4.5, and the wild blueberries are lightly pruned during the initial flowering stage. In this invention, the quality indicators preferably include polyphenols and / or flavonoids. This invention preferably adjusts the pH value by applying sulfur powder or calcium carbonate. This invention does not impose any special limitations on other management practices for wild blueberries; conventional cultivation management methods such as fertilization, irrigation, and pest and disease control are sufficient.
[0017] In this invention, to increase the individual fruit weight of wild blueberries, the pH value of the soil used for wild blueberry cultivation is stabilized at 4.0 ≤ pH < 4.5, and heavy pruning is performed on the wild blueberries during their fruiting period. This invention preferably adjusts the pH value by applying sulfur powder or calcium carbonate. This invention does not impose any special limitations on other management practices for wild blueberries; conventional cultivation management methods, including fertilization, irrigation, and pest and disease control, are sufficient.
[0018] In this invention, when restoring wild blueberry plants, the soil pH is stabilized at 4.5 ≤ pH ≤ 5.0, and the wild blueberries are lightly pruned during their initial flowering stage. This invention preferably adjusts the pH by applying sulfur powder or calcium carbonate. This invention does not impose any special limitations on other management practices for wild blueberries; conventional cultivation management methods, including fertilization, irrigation, and pest and disease control, are sufficient.
[0019] Implementation Recommendations (Key Points for On-site Operation): 1. Frequency of pH measurement and adjustment: pH should be measured before planting and during the growing season (every 4–6 weeks), and random checks should also be performed after the rainy season or irrigation; adjustments should be made in batches according to the measurement results to avoid drastic pH fluctuations caused by applying a large amount of pesticide at once.
[0020] 2. Pruning time window: The main pruning period is during the initial flowering stage. After fruiting, light shaping can be carried out to promote ventilation and light exposure.
[0021] 3. Selection of pruning intensity: In production practice, it can be adjusted according to the production goals (high-quality fruit - preferably 4.0≤pH<4.5+ light pruning; large fruit - preferably 4.0≤pH<4.5+ heavy pruning; long-term stability - preferably 4.5≤pH≤5.0+ light pruning).
[0022] 4. Supporting cultivation management: Apply fertilizers appropriately, strengthen water management and pest and disease control to ensure the stable reproduction of experimental results.
[0023] To further illustrate the present invention, the following detailed description is provided in conjunction with embodiments, but these should not be construed as limiting the scope of protection of the present invention.
[0024] Example 1 Cultivation methods for wild blueberries: 1. Plot Selection and Grouping: In early June 2025, wild blueberry communities with similar growth conditions were selected in natural blueberry distribution areas (such as Juegouxun Forest Farm in the Greater Khingan Mountains). Three substrate pH levels were set: 4.0 ≤ pH < 4.5, 4.50 ≤ pH < 5.0, and 5.0 ≤ pH < 5.5. At each pH level, three pruning intensities were set: light pruning, no pruning, and heavy pruning. Light pruning removed 15% of the total number of branches throughout the year, and heavy pruning removed 35% of the total number of branches throughout the year. Each treatment was replicated three times and randomly assigned to a block design.
[0025] 2. pH adjustment and stabilization: Before planting, based on soil test results, the pH is adjusted to the target range by applying sulfur powder and calcium carbonate, and the pH is measured monthly during the growing season, with minor adjustments as necessary.
[0026] 3. Pruning time and method: Light pruning is carried out at the initial flowering stage, mainly removing diseased, weak, and overly dense branches; heavy pruning is carried out during the fruiting stage, removing 35% of overly old or unfavorable fruiting branches to promote renewal.
[0027] 4. Observation indicators: During the harvest period, fruit morphology (transverse diameter, longitudinal diameter, fruit shape index), internal components of the fruit (polyphenols, flavonoids), and single fruit weight and plant growth indicators (leaf length, leaf width, plant height, crown width) are measured.
[0028] Conventional cultivation and management methods are used for fertilization, irrigation, and pest and disease control.
[0029] The specific experimental results are as follows (simplified table, values are derived from the experimental statistical average): Table 1. Effects of different soil pH ranges and pruning intensities on the growth indicators of wild blueberry fruits. Note: The data in the table are the average values of the experiments.
[0030] As can be seen from the table above: 1. Under the combination of pH 4.0 ≤ pH < 4.5 and light pruning, the levels of polyphenols (2.69 mg / g) and flavonoids (1.09 mg / g) were the highest in the experimental group, indicating that this combination is beneficial to improving the antioxidant and nutritional quality of blueberry fruits; 2. When targeting single fruit weight, the pH range of 4.0 ≤ pH < 4.5 combined with heavy pruning resulted in the maximum single fruit weight (1.58 g). Simultaneously, this treatment resulted in a transverse diameter of 10.38 mm, a longitudinal diameter of 10.33 mm, and a fruit shape index of 1.00, indicating that this combination not only increased single fruit weight but also promoted the formation of fuller fruit shapes. However, the yield per plant under this treatment was 7.31 g, lower than some other treatments, suggesting that while heavy pruning promotes single fruit enlargement, it may have a certain impact on the total yield per plant.
[0031] 3. Regarding yield per plant, the highest yield among all treatments was 13.5 g under the pH 4.5 ≤ pH < 5.0 and no pruning combination, indicating that maintaining natural fruiting within this pH range is more conducive to maintaining a high yield. 4. With pH 4.5 ≤ pH < 5.0 and light pruning, the leaf length was 23.38 mm, the leaf width was 8.19 mm, and the crown width was 28.25 cm, all of which showed excellent performance. At the same time, the yield per plant reached 10.45 g, which was better than the treatment combination that implemented pruning. This indicates that the combination is more conducive to the recovery of plant vegetative growth and the maintenance of plant vigor, and is suitable for management needs aimed at restoring plant vigor and promoting subsequent stable production.
[0032] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.
Claims
1. A method for cultivating wild blueberries, characterized in that, Includes the following steps: The soil pH of wild blueberries was stabilized at 4.0≤pH≤5.0, and a pruning pattern was selected to prune the wild blueberries within the same growing season, which was either light pruning or heavy pruning. The standard for light pruning is: removing diseased, weak, and overly dense branches, with the amount of branches removed accounting for 10-20% of the total number of branches throughout the year; The standard for heavy pruning is: removing old branches and branches that are not conducive to fruiting, with the amount of branches removed accounting for 30-40% of the total number of branches in the year.
2. The cultivation method according to claim 1, characterized in that, To improve the quality of wild blueberries, the soil pH should be stabilized at 4.0 ≤ pH < 4.5, and the wild blueberries should be lightly pruned during the initial flowering stage.
3. The cultivation method according to claim 2, characterized in that, The quality indicators include polyphenols and / or flavonoids.
4. The cultivation method according to claim 1, characterized in that, To increase the single fruit weight of wild blueberries, the pH value of the soil for wild blueberries should be stabilized at 4.0 ≤ pH < 4.5, and the wild blueberries should be heavily pruned during the fruiting period.
5. The cultivation method according to claim 1, characterized in that, When restoring wild blueberry plants, stabilize the soil pH at 4.5 ≤ pH ≤ 5.0, and lightly prune the wild blueberry plants during their initial flowering stage.
6. The cultivation method according to claim 1, characterized in that, Adjust the pH value by applying sulfur powder or calcium carbonate.
7. The cultivation method according to claim 1, characterized in that, Light pruning and heavy pruning are two mutually exclusive pruning modes, and either one can be chosen to be implemented within the same growing season; among them, sanitary pruning carried out to remove diseased, dead, or broken branches is not considered light pruning.
8. The cultivation method according to claim 1, 2 or 5, characterized in that, The amount of branches removed during the light pruning is 15% of the total number of branches throughout the year.
9. The cultivation method according to claim 1 or 4, characterized in that, The amount of branches removed during the heavy pruning is 35% of the total number of branches throughout the year.