Detailed Explanation of the Key Management Techniques During the Grape Veraison Period
Grapes are a very popular fruit, and the market demand for them in China is very large. This is especially true for varieties such as Sapphire Grapes and Kyoho Grapes. Their planting areas are all very large. When growing grapes, we must reasonably adjust management methods according to the grape's growth stage. So how should management be carried out during the grape veraison period? Below, the editor brings you the management techniques for the grape veraison period. Let's take a look!
1. Water Management
The veraison period of grapes is an important period for the fruit to increase in sweetness. At this time, if you want to increase the sweetness of the grapes, then first of all you must reduce the moisture in the field. From the grape berry expansion period to the veraison period, the grape fruit's demand for water gradually declines. Therefore, during the grape veraison period, we should reduce the amount of watering to promote grape berry coloration and ripening. Do a good job of field drainage. If it is the rainy season, then pay even more attention. However, a certain amount of moisture must also be maintained, otherwise it will also affect the sugar content and coloration. Keeping the soil moist is sufficient.
2. Reasonable Fertilization
When grapes enter the early stage of veraison, their demand for nutrients increases, so at this time we should provide sufficient nutrients to the grapes through fertilization. Improve berry quality and promote fruit ripening. However, we must pay attention to the type and application amount of fertilizer. In particular, nitrogen fertilizer must not be applied too much. Fertilizer should mainly be phosphorus and potassium fertilizer. And reasonable adjustments should be made according to the planted variety. If it is a mid-to-late maturing variety, then this is also a critical period for young fruit expansion. At this time, a small amount of topdressing promotes young fruit expansion. It can also enhance the grape's quality and storage capacity and reduce fruit cracking.
3. Foliar Fertilization
During the grape veraison period, we should also appropriately spray foliar fertilizer. This can effectively increase the berry's volume and weight and improve sugar content and coloring degree. Ensure the fruit can grow uniformly and try to keep the fruit ripening time consistent. It can also effectively prevent and control pests and diseases, and the storage quality of grapes will also be improved as a result. When spraying foliar fertilizer, it should be done in weather such as windy-free cloudy days. Remember not to do it at noon on sunny days. Moreover, foliar fertilizer can only serve as a supplement for grapes and cannot completely replace soil fertilizer, so when spraying foliar fertilizer, soil fertilization must be taken as the prerequisite.
4. Promoting Coloration
After grapes enter the veraison period, the bags should be properly opened to provide sufficient light for the fruit. Then remove the old leaves and yellow leaves around the fruit to avoid blocking sunlight from the fruit, so that the grape clusters can receive light evenly. During coloration, grapes need a substance called anthocyanin, and the sugar produced by photosynthesis is the main substance for synthesizing anthocyanin. Therefore, protecting healthy leaves must also be done well. Finally, growth regulators should be used reasonably, mainly ethephon, but the concentration must be well controlled, and small-area trials should be conducted first.
The above is a brief introduction to the management techniques for the grape veraison period. The management work during the grape veraison period is very important and directly affects the quality and yield of grape fruit. Therefore, everyone must pay close attention. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!