Rapeseed is the primary oil crop in Hanjiang District, Chongqing. The annual planting area exceeds 100,000 mu, with a total output of approximately 9.5 million kilograms. However, field surveys have revealed that seedbed management is often inadequate, leading to issues such as uneven seedling growth and poor plant health. To address these challenges, we have developed a set of practical measures aimed at improving seedbed management and ensuring healthy rapeseed development.
First, it is essential to manage seedlings early and uniformly. When the rapeseed has 1–2 leaves, thinning should be carried out based on the principle of "thin for weak, strong for small, healthy for sick, and keep pure." At the three-leaf stage, it's important to retain 50,000–60,000 seedlings per acre, with one mu of seedbed supporting five mu of transplanted land. This ensures uniform growth and better quality seedlings.
Second, early recovery of seedlings is crucial. During the thinning process, top-dressing with diluted manure should be applied to maintain soil moisture and meet the nutritional needs of the seedlings. Applying 4.5 kg of urea per acre mixed with 400–500 kg of water helps promote vigorous leaf growth. A second top-dressing should be done 5–7 days before transplanting to encourage root development and improve survival rates after transplanting. In case of rainy weather, careful control of water and fertilizer is necessary to avoid diseases like blisters and winter frost damage.
Third, dwarfing treatment and boron application are important for healthy growth. Spraying 15 g of 15% paclobutrazol per mu (or half the dose if using 25% high-efficiency azole) mixed with 75 kg of water can help control excessive growth and enhance plant resistance. Boron deficiency can lead to problems such as "flowers without fruits," so applying a 0.1–0.2% borax solution before transplanting is essential. This should be done once or twice, preferably alongside dwarfing treatment. After four leaves, seedlings should be hardened off to prevent over-fertilization with nitrogen.
Fourth, timely pest and disease control is necessary. Common pests include downy mildew, cabbage caterpillars, aphids, beetles, and diamondback moths. For downy mildew, spraying 100 g of 40% carbendazim in 100 kg of water is effective. For insect control, mix 100 g of omethoate, or 50 ml of deltamethrin, or 50 ml of insecticidal king, or 80 ml of enemy killer in 100 kg of water and apply accordingly.
Lastly, chemical weeding should be carried out when weeds have 2–6 leaves. Apply 25 ml of 10.8% efficient grasshopper, or 50 ml of 50% fine grass herbicide, or 50 ml of fine steady kill in 40–50 kg of water to each acre. This helps reduce manual labor and ensures a clean seedbed for healthy seedling growth.
By implementing these strategies, farmers can significantly improve the quality and yield of their rapeseed crops. Proper seedbed management not only enhances plant health but also lays a solid foundation for successful transplantation and higher productivity.
Hoegaarden 500ml ,Fruity Hoegaarden Beer for a Tropical Holiday,Light Hoegaarden Beer for a Relaxed Evening,Blonde Hoegaarden Beer for a Casual BBQ
Yanbian Baichuan Import and Export Trade Co., LTD , https://www.baichuanbeer.com