1. Reasonable top-dressing is essential during the flowering stage. Apply 150 kg of urea per hectare, placing it about 15 cm away from the root in furrows or holes. At full bloom, spray a 0.2%-0.4% solution of potassium dihydrogen phosphate. Depending on plant growth, you may need to apply additional nutrients one or two more times to ensure optimal development.
2. Pruning and leaf protection are crucial for healthy growth. As branches develop, remove them promptly to concentrate nutrients on the main stem, ensuring better fruit set and fullness. Prune early and thoroughly, being careful not to damage the plant. In sunflower cultivation, avoid shaking the plants. Protect the leaves, especially the upper ones, as they play a vital role in photosynthesis and overall plant health.
3. Assist pollination is important for maximizing yield. Perform artificial pollination when over 70% of the sunflowers in the field are in bloom. The first pollination should occur 2-3 days after the first flower opens, followed by another round every 3 days. Aim to complete pollination between morning and 11 am, once the dew has dried. If not possible in the morning, you can do it in the late afternoon, around 3 pm. Use the "dust-puff" method: create a small puff using cardboard, plastic, cotton, or clean gauze, and gently brush it across each flower head to transfer pollen effectively.
4. Strengthen pest and disease management. Common diseases in sunflower crops include sclerotinia and downy mildew, while pests like sunflower moths can also cause damage. For sclerotinia, use fungicides such as thiophanate-methyl, carbendazim, or polyoxin. To manage downy mildew, apply products like Kocide, Previcur, or antiviral agents. For sunflower moth control, consider using Bt emulsion or releasing Trichogramma wasps in the field. Regular monitoring and timely intervention are key to maintaining a healthy crop.
Instant Fresh Noodles,Bibimbap With Black Truffle Sauce,Spicy Beef Bibimbap,Spicy Crawfish With Shrimp Granules Over Noodle
Hunan Jiapin Jiawei Biotechnology Co. , https://www.foxfoodie.com