Grape swelling and veraison is a key stage in fruit growth and development, which is directly related to the yield and quality of grapes. Properly managed during this period, it can promote fruit size, uniform coloration, and increase the value of the commodity. Here are some tips to help manage your grapes during veraison:

1. Balanced fertilization: In the early stage of veraison, the use of nitrogen fertilizer should be appropriately controlled to avoid late ripening of fruits, and phosphorus and potassium fertilizers should be increased to promote the accumulation of sugar and color development of fruits. Organic fertilizer or compound fertilizer can be considered to improve soil structure and soil fertility.

2. Moisture management: Keep the soil moderately moist and avoid too much or too little water. Too much water can cause fruit cracking, while too little water can affect fruit enlargement and sugar accumulation. Drip irrigation or micro-sprinkler irrigation can be used to ensure water supply and avoid excessive moisture on the leaf and fruit surfaces, so as to reduce the occurrence of diseases.

3. Prune and thin the fruit: Reasonable pruning, remove the leaves that block the light of the fruit, increase the light transmittance, and promote the uniform coloration of the fruit. At the same time, fruit thinning is carried out to remove deformed fruits and diseased fruits, so that nutrients can be more concentrated to supply the remaining fruits, and promote their uniform expansion and veraison.

4. Bagging and bagging: In the early stage of fruit expansion, the fruit can be bagged to prevent the invasion of pests and diseases and bird pecking, and protect the cleanliness of the fruit surface. Remove the bag at the right time before veraison, so that the fruit is exposed to direct sunlight and promote natural coloration. Pay attention to the weather conditions when removing the bag, and avoid removing the bag immediately after rain to prevent germ infection.

5. Foliar spraying of trace elements: Appropriate spraying of calcium, magnesium, boron and other trace elements foliar fertilizer can enhance fruit hardness, promote nutrient absorption during fruit ripening, and improve fruit quality and color.

6. Pest control: Regularly inspect orchards to detect and deal with pests and diseases in a timely manner. Adopt a combination of biological control, physical control and chemical control methods to minimize the use of chemical pesticides and protect the ecological environment.

7. Mulching film: Laying reflective film or black mulch film between the grape rows can effectively increase the ground temperature, maintain soil moisture, and reflect light to the lower part of the canopy and the inner chamber of the tree, promoting uniform coloring of the fruit.

Through the comprehensive application of the above measures, it can effectively promote the healthy growth of grapes during the fluffing and veraison period, and improve the yield and quality of grapes.