Grape seedlings planted in autumn don't need to be delayed in spring. The germination time is 20-30 days earlier than that planted in spring, and they can blossom and bear fruit in the same year, usually in the second year. A few grape seedlings planted in spring can bear fruit in the second year and enter the bearing period in the third year.
The temperature change in autumn is smaller than that in spring, and the air and soil temperatures are higher than that in spring, which is beneficial to wound healing and new root growth. Therefore, the survival rate of grape seedlings planted in autumn can generally reach more than 90%, which is about 20% higher than that planted in spring.
In northern China, autumn sowing begins in late September of 10 and ends in early October of 10, lasting 45-50 days, which is longer than the suitable sowing period of spring sowing 15-20 days, and it can also avoid competing with crops such as grain, cotton and oil for water and fertilizer.
Extended data:
Growth habit
The lowest temperature for grape growth is about 12℃- 15℃, the lowest ground temperature is about 10℃- 13℃, the optimum temperature for flowering is about 20℃, and the optimum temperature for fruit expansion is 20℃-30℃.
Such as large temperature difference between day and night, good coloring and high sugar content. After the grapes germinate in spring. If the temperature rises too fast, the branches will grow too fast, which is characterized by insufficient node length and poor fertilization at flowering stage. In case of cold spring, we should pay attention to applying more phosphate fertilizer and high-carbon organic matter and reducing nitrogen fertilizer as much as possible.
Although grapes can be planted in all kinds of soils, loam and fine sand loam are the best, and sandy soil has good air permeability. But the ability of keeping fertilizer and water is poor.