Direct seeding technique of double-low rapeseed with less no-tillage

1. Selection of varieties. Double-low rape varieties with late sowing resistance, fast seedling emergence, compact plant type, close planting resistance, strong disease resistance and lodging resistance and high yield potential were selected. two。 Make moisture and prepare for sowing. The key technology of direct seeding rape lies in sowing whole seedling, uniform seedling and uniform seedling. 3. Apply enough base fertilizer. It is required to apply base fertilizer and seed fertilizer in advance, accounting for about 30% and 40% of the total amount of fertilizer applied. 4. Early broadcast at the right time. Generally, the sowing time is 10 days later than that of seedling transplanting rape. 5. Open trenches and cover the soil. Before sowing, the side of the box should be leveled and three ditches should be opened to ensure the smooth flow of irrigation and drainage. 6. The seedlings are fixed. It is necessary to interplant seedlings as early as possible in 2Mel 3-leaf stage, and before and after 4Mel 5-leaf stage, seedlings should be determined according to the growth of seedlings in the field and the level of fertilization, generally leaving 1.8-25000 seedlings per mu. 7. Chemical regulation. From the end of November to the beginning of December, the growing rapeseed was sprayed with 15% paclobutrazol 40ml 50g per mu and 50 kg water. 8. Scientific fertilization. In fertilizer operation, it is necessary to apply seedling fertilizer, wax fertilizer and bolting fertilizer early, the total amount of pure nitrogen is about 15 kg per mu, and balanced application of nitrogen, phosphorus, potassium and boron fertilizer. 9. Prevent diseases and insects. Sclerotinia sclerotiorum should be controlled mainly and comprehensively, in addition to taking reasonable rotation, seed treatment, ditch drainage, reducing humidity and other measures, generally, 50% Fu ·Sclerotinia wettable powder 80 per mu can be evenly sprayed 1-2 times with 100 grams of water at the early flowering stage and full flowering stage. This technology is suitable for popularization and application in the Yangtze River basin.