What to Do When Grape Bud Break Is Uneven? Cause Analysis and Solutions
As temperatures gradually rise, many plants begin to bud. For grape growers, the earlier the grapes bud, the earlier they can reach the market. However, uneven grape bud break is something many growers encounter. It is not only time-consuming and labor-intensive to manage, but also causes grapes to ripen at different times, affecting their market timing and reducing economic returns. So what causes uneven grape bud break? How can it be solved? Let's take a look.
I. Causes of Uneven Bud Break
1. Insufficient tree nutrition
Many growers pursue high yields, which leads to excessive consumption of tree nutrients and reduced stored nutrients, thus affecting bud break the following year. In addition, management after harvest last year was not in place, and pest and disease control was inadequate, causing early leaf drop in the grapes, weakened photosynthesis, and insufficient nutrient accumulation, which affected bud break.
2. Improper pruning
Grapes have strong apical dominance, and the buds farthest from the roots are the first to sprout. If too many buds are retained when pruning medium and long canes, the buds at the tips of the fruiting canes will begin to sprout first, and the further back they are, the later they will sprout, resulting in uneven bud break.
3. Insufficient water
When grapes bud, if there is sufficient water, they sprout earlier and the sprouting rate is relatively high. But if the soil is dry and lacks water, they sprout later and the sprouting rate is relatively low. If drainage was not done in time during last year's autumn rainy season, it will cause excessive shoot growth, insufficient nutrient accumulation, and lead to uneven bud break.
4. Temperature
During last year's low temperatures, if cold protection and frost resistance measures were not in place, prolonged low temperatures will cause slight freezing damage to the grape canes. In spring, nutrient transport will be impeded, affecting bud break and flowering. In addition, low temperatures also affect the root system's absorption capacity, thereby affecting bud break.
II. Solutions
1. Apply base fertilizer
After the grapes are harvested, base fertilizer should be applied in autumn together with orchard cleanup, mainly organic fertilizer and farmyard manure. This can help the grapes overwinter, provide nutrients to the plants, and promote bud break the following year.
2. Prune and irrigate in time
Timely prune back shoots that have dried out. For canes with uneven bud break that are weak at the front and strong at the back, prune back to good buds and good cane sections, focusing on restoring tree vigor. After ground temperature rises, irrigate in time to ensure sufficient water. After watering, loosen the soil in time to prevent soil compaction. The amount of irrigation should not be too much; keep soil moisture content at 65%.
3. Fertilize
After the plants bud, fertilization can promote uniform bud break. In the early stage, mainly use nitrogen fertilizer; in the later stage, increase the application of phosphorus and potassium fertilizers. In addition, foliar fertilizer can also be sprayed to promote the growth and maturation of new shoots.
The above is an introduction to the causes of uneven grape bud break and solutions. We hope it can help you. To learn more related knowledge, please follow us.