2. Container: It is recommended to use a well-ventilated earthen basin, followed by a sand basin, and then a plastic basin. It is not recommended to use a pottery basin or a porcelain basin. Because blueberries are fibrous roots and shallow roots, large pots are not needed, and deep pots are forbidden. 15 cm pots are recommended for young seedlings, 25 cm pots for finished seedlings, and large pots are forbidden for young seedlings.
3. Temperature: Blueberries need low-temperature vernalization to blossom and bear fruit, which is beneficial to flower bud differentiation. Especially in winter, blueberries should be dormant and vernalized at 5℃, and the temperature should not be too low or too high. In summer, the weather is hot and humid.
4. Fertilization: Blueberries are oligotrophic plants. Compared with other fruit trees, the contents of nitrogen, phosphorus, potassium, calcium and magnesium in trees are very low. Because of this feature, blueberries should be specially protected against excessive fertilization to avoid fertilizer damage. When blueberry is planted, organic matter has been mixed into the soil, so the fertilization of blueberry mainly refers to topdressing. Phosphorus pentoxide and ammonium sulfate are suitable fertilizers for potted blueberries. Blueberry excessive fertilization is easy to cause tree damage or even death of the whole plant. Therefore, the amount of fertilization should be cautious, depending on soil fertility and tree nutrition, not less than more! In addition, blueberries cannot be applied with nitrate fertilizers, such as ammonium nitrate and potassium nitrate.
5. Watering: Blueberries have shallow roots and are sensitive to water shortage. They should always keep the basin moist without water, which is different in different growing seasons of blueberries. In the vegetative growth stage, the most suitable water condition can always be maintained, which can promote the plants to be strong. However, in the fruit development stage and before the fruit matures, the water supply must be reduced appropriately to prevent the rapid growth of nutrition from competing with the fruit for nutrients. After the fruit is harvested, the most suitable water supply can be restored to promote the vegetative growth. Reduce the water supply from Mid-Autumn Festival to late autumn, so as to enter the dormant period in time. In order to maintain the acidity of the soil, it is recommended to use 3-5 degrees vinegar, and apply 500 ml every month, including half a tablespoon of vinegar.
6, plastic pruning: diligent pruning is also the principle of ensuring high yield of blueberries. Too many branches will bear small fruits, which need to be pruned properly, especially after the flowers wither, to ensure nutrition and space.