The technology is expected to cover a total area of 600 million mu within the province. With an average yield of 160 kilograms per mu, high-yield fields can reach up to 200 kilograms, while mass production areas can achieve as much as 250 kilograms per mu. This increase in efficiency brings an additional 60 yuan per mu. This method is suitable for promotion across the province, particularly in rice-growing regions where it can be effectively applied. Key technical points include: First, carefully select improved varieties. Based on the main rapeseed varieties announced by the Provincial Department of Agriculture, choose hybrid varieties that are high-quality, disease-resistant, have a moderate growth period, and offer good seed quality and high yields. In Sanxian District, double-low rapeseed varieties with early growth and late sowing are recommended. Second, properly prepare the field. After harvesting rice, ensure the remaining stubble is less than 5 inches tall. Use a rope to mark ditches, with a car width of 120 cm, ditch width of 30 cm, and depth of 20 cm. The waist furrow and ditches should be slightly widened and deepened to match the three-ditch system. A ditching machine is used to open the ditches, and the soil is evenly spread over the car surface. Any uneven areas are manually flattened. Third, apply fertilizers scientifically. Phosphorus, potassium, and boron fertilizers are applied as base fertilizers, while nitrogen is split into ratios of 5:3:2. For medium-fertilizer fields, 40 kg of rapeseed formula and 1 kg of borax or 200 g of boron are used as base fertilizer. Before and after the winter solstice, apply about 10 kg of compound fertilizer, adding 2–3 kg of urea if needed. After the spring budding stage, apply 3–5 kg of urea and spray 50 g of Sorbor Boron. One kilogram of potassium dihydrogen phosphate or foliar fertilizer is used one week after the final flowering to promote pod development. Fourth, ensure timely sowing and transplanting. The best time for sowing is between mid-September and mid-October, but it can be adjusted to early September or late October. Sowing rates are controlled at 200–300 grams per mu, with adjustments based on sowing time and soil fertility. Seedlings are transplanted when they have five leaves. Extra or uneven seedlings are removed for use as feed. Transplanting starts in early October and continues until mid-November. Fifth, maintain a reasonable planting density. At the third leaf stage, remove weak or crowded seedlings. By the fifth leaf stage, thinning is completed. Plant density varies depending on land quality—8,000–10,000 plants per mu (12–15 per square meter) for fertile land, and 10,000–12,000 plants (15–18 per square meter) for poorer or later-planted fields. Special plots may require up to 20,000 plants (22–28 per square meter), but not more than that. Transplanting density is generally 6,000–8,000 plants (10–12 per square meter), with earlier transplants slightly spaced out and later ones more dense. Sixth, implement chemical weeding. Apply herbicides 5–7 days before site preparation, targeting broad-leaved weeds during sunny afternoons. Within 24 hours, spray herbicides to control weeds that emerge after the 3-leaf stage. Seventh, focus on pest control. During the seedling stage, monitor and manage cabbage caterpillars and aphids. Follow pest forecasts and act promptly. During the flowering period, use 40% sclerotinia fungicide to control sclerotinia once in early flowering, spraying from the bottom up. Adjust based on forecast and condition. Eighth, harvest and sell on time. Begin harvesting when over 80% of the plants show pod color, and the upper pods are not fully yellow. After stacking or spreading for 5–7 days, thresh and dry the seeds promptly. Try mechanical harvesting, and delay the final harvest by 5–7 days. Monitor market conditions and sell in a timely manner to avoid quality loss and delayed sales.

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