Double-low rapeseed can reduce erucic acid and glucosinolate content, improve quality, increase nutrition and health care, and basically adopt double-low rapeseed cultivation in production. From the perspective of many years of production practice, a good double-low rapeseed must be based on its unique fertility characteristics, and take the high-yielding path of strong seedlings and sparse planting. 1, early broadcast seedlings timely. Double-low rapeseed grows slowly and grows weaker than ordinary rapeseed. Therefore, it must be sowed early in time to cultivate good age seedlings. The medium-maturing varieties such as Zheshuang 72 and Huyou 15 can be sown in late September. The seedling age is 30-35 days, and the seeding amount per acre is 0.5 kg. The ratio between Putian and Datian is 1:5. After emergence, multiple seedlings were planted in time for the three-leaf period, and 110-120 strains were planted per square meter. From the three-leaf to four-leaf stage, 150 ppm of paclobutrazol was used to control seedlings to prevent seedlings from becoming elongated. 2, seedlings thin plant promotion Qiu Fa. In late October and early November, fertilization with medicines was transplanted, and seedlings were sparsely planted. General spacing 45-50 cm, spacing 20 cm, acres planted 7000. After planting watering roots, after live seedlings Mushi thin human excrement 750-1000 kg or ammonium bicarbonate 10-15 kg for seedling fertilizer, in order to promote the autumn, take advantage of high yield seedling frame. 3, rational fertilization competition for high yield. Double-low rapeseed is resistant to fat and needs a large amount of fertilizer. Apply 40 kg of ammonium bicarbonate, 40 kg of phosphate fertilizer, and 7.5 kg of potash per acre. In the early application of Miao Fei, on the basis of timely application of wax fertilizer, wax fertilizer application of organic fertilizer, can be between the Osmium to the chill, between Mushi bar fertilizer or human waste 1000-1500 kg, in order to achieve protection of winter Strengthen the effect of spring hair. When the moss is 3-5 cm high, the moss fertilizer must be used well. The amount of application should be different depending on the situation of the seedlings, soil strength, etc. Generally, 750 kg of human excrement or 7.5 kg of urea should be applied. 4, increase boron fertilizer to promote health. Boron is an indispensable trace element in rapeseed growth, especially double-low rapeseed is more sensitive to boron, and the absorption is larger. 0.5 kg of borax and coke ash can be mixed for each mu, and the root-fertilizer is used for transplanting. Some areas with severe boron deficiency, such as mountainous areas and semi-mountainous areas, can be sprayed with 0.2% borax solution for 50 kg during the period of bolting, and spraying boron fertilizers during the flowering period in combination with Sclerotinia sclerotiorum to prevent “flowering but not realizingâ€. 5, prevention and cure pest control harvest. According to the law of occurrence of pests and diseases, the locusts and cabbage caterpillars should be cured in the seedling stage of double-low rapeseed, and the aphids should be controlled mainly in the middle and later stages. Sclerotinia at the beginning of flowering and flowering. In addition, do a good job of draining the ditch, reduce the humidity in the field, reduce the incidence of rapeseeds, and ensure high-yield rapeseed.