Strong seedlings are the foundation for achieving high yields in rapeseed production. Cultivating healthy and vigorous seedlings is essential to increase oilseed yield, improve farm income, and enhance overall efficiency. To grow strong seedlings, four key areas must be carefully managed.
First, selecting a suitable site for the seedbed is crucial. The seedbed serves as the starting point for healthy plant development, so it's important to allocate enough space to produce sufficient robust seedlings. The ideal location should have flat terrain, fertile soil that is loose and well-drained, with easy access to irrigation. Typically, the ratio of seedbed area to the main field should be around 1:6 to 1:7. A poor seedbed can lead to weak, unhealthy plants.
Second, proper soil preparation and fertilization play a vital role in seedling growth. Before sowing, the soil must be finely tilled to ensure it is loose, even, and at the right moisture level to support germination. After plowing and drying, apply 20-30 tons of well-decomposed manure or compost, mixed thoroughly into the topsoil. Then, use standard ropes to create furrows about 4 feet wide, which helps with drainage and future seedling management.
Third, choosing the right time to sow and using quality seeds is essential. Selecting improved varieties like Mianyou No. 11 or Zhongyouza No. 12 (also known as Hui 568) can significantly boost productivity. Before sowing, expose the seeds to sunlight for 2–3 days and dry them for 3–4 hours daily to improve viability. Sowing times vary by region—mid-August in high mountain areas, late August in mid-altitude regions, and early September in lowland areas. Seedlings should be transplanted after about 30–40 days of growth. Sow seeds evenly at a rate of 1.2 pounds per seedbed, and cover them with rice straw or wheat stalks to retain moisture and protect against drought.
Fourth, meticulous management is necessary to ensure strong seedling development. After sowing, monitor the seedbed regularly for water needs and remove coverings once the seedlings emerge. At the three-leaf stage, thin the seedlings to maintain a density of 18–20 per square foot, resulting in 100,000–120,000 seedlings per mu. Apply paclobutrazol (15%) at 50g per mu to promote compact growth. Once seedlings are established, provide additional nutrients through diluted manure or urea, especially 6–7 days before transplanting. Finally, control pests such as aphids, diamondback moths, and cabbage worms using appropriate pesticides like dimethoate or fast kill ling, while also managing weeds to prevent competition for nutrients.
Insect net greenhouse also known as plant and vegetables greenhouse net. Used for prevent the insect fly into the greenhouse during the plant growing, and cover the plants. Key off the approaches that the pests (adult insect) breeding. Effective control of the spread of all kinds of harmful pests spread, such as Cabbage caterpillar, diamondback moth, aphids, flea beetles, Sweet agnates, American leaf miner, literal etc and prevent the harmful of virus spread. Significantly reduced the use of chemical pesticides, so that the planting vegetables good-quality and health.
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