Over the past 50 years of the development of New China, rapeseed, as the most important oilseed and cash crop, has developed steadily, and the promotion of new varieties has achieved three revolutions. In the early days of the founding of the People's Republic of China, some excellent rapeseed varieties were promoted through variety selection, such as Qixingjian, Ningbo rapeseed, Xinghua rapeseed, Xishuibai, etc., which greatly promoted the recovery and development of my country's rapeseed production. Although rapeseed flowers are beautiful, they are difficult to grow. The editor below will introduce to you the cultivation methods of rapeseed flowers. Rapeseed flower breeding methods. Top dressing outside the roots. Regular spraying of trace elements such as phosphorus, boron, and manganese or a compound organic fertilizer solution during the flowering period of rapeseed can prevent rapeseed flowers from bearing fruit. Foliar spraying of 0.02% boric acid solution can increase the number of effective branches, the number of pods per plant and the thousand-grain weight of rapeseed. Foliar spraying of 2% to 3% superphosphate aqueous solution on mature pods can increase the yield and quality of rapeseed. 2. Irrigation of flowering water. The flowering period of rape lasts for 30 days and requires a lot of water. Irrigation can be carried out 1 to 2 times according to soil moisture. 3. After the rapeseed with pod water finally blooms, it can be irrigated in time according to the water content. Irrigation can be done once or twice during the pod-setting period. 4. Timely irrigation is a practical and effective method to increase soil moisture content, increase ground temperature, and prevent rapeseed from freezing and drought. Where there are irrigation conditions, spring irrigation should be carried out in a timely manner to alleviate the continued death of rapeseed seedlings caused by freezing damage and water loss. In addition, rapeseed changes from a greening stage to a parallel stage of vegetative growth and reproductive growth, and then enters a period in which reproductive growth dominates. Water and fertilizer are necessary conditions for the growth of rapeseed. 5. Apply fertilizer early in spring and rely on irrigation. Fertilizer must not be applied in places without irrigation conditions. Whether it snows or rains, it all depends on seedlings. Large seedlings and vigorous seedlings can be fertilized less or not at all, while small seedlings and weak seedlings should be fertilized more. Spraying a new type of high-fat film on the surface of seedlings can prevent bacterial infection, improve the ability to withstand natural disasters, increase the intensity of photosynthesis, and protect seedlings from growing vigorously. Under normal circumstances, 5-7.5 kilograms of urea can be applied per acre, and it can be applied in ditches or broadcast before irrigation. 6. Especially in the drought-ridden areas of Weibei, deep plowing and weeding is necessary to increase soil moisture and allow rapeseed to use deep water to alleviate drought.