During the autumn sowing of oilseed rape this year, the rainfall in the upper reaches of the Yangtze River basin was relatively high. The rice harvest in the middle and lower reaches was postponed and drought occurred in mid-October. The rapeseed planting period was generally delayed compared to the average, the upstream area was postponed by about 10 days, and some areas in the middle and lower reaches were postponed5 Days or so, resulting in a greater differentiation of rape seedlings, the upper reaches of the group than in the previous year, 3 to 5 leaves, the middle and lower part of the late rape seedlings, seedlings, young, weak seedlings. According to the forecast of the China Meteorological Administration, the El Niño event may be aggravated this winter, and there is a high probability of occurrence of low-temperature rain and warm winter. All over the country, according to the situation of rape seedlings, it should be well managed during the wintering period. Timely nursery seedlings planted live and early planted rapeseed from the 3-leaf stage early and early seedlings make up seedlings, 4 to 5 leaf stage Dingmiao, live rapeseed generally reserved 12,000 to 30,000 per mu, transplanting rapeseed guarantee 06,000 per mu ~ 0.8 million strains. Rapeseed fields that have not been transplanted must seize the favorable opportunity for the recent increase in rainfall and improved public opinion. They should timely grab robbers and early transplants, and increase the density of transplants appropriately to make up for late. Generally no less than 07,000 plants per acre and a maximum of 10,000 plants can be planted. Early clean up of trenches, droughts, etc. During the winter, continuous rainy weather often occurs in the Yangtze River valley. Low-lying lands are prone to waterlogging, resulting in oxygen-deficient rot and weak seedlings of rape, reducing wintering frost resistance, and increasing sclerotia. Disease occurs, affecting yield and quality. Before the winter, it is necessary to support the “Three Ditches†and clear the ditch in time to ensure smooth drainage and irrigation. Classification of seedlings for good fertilizer and water management After transplanting rapeseed with green or direct seedlings, the application of urea is 5-6 kg per mu; from late December to early January, the wax fertilizer is applied according to the seedling growth and urea is applied 5-7 per mu. Kg, potassium chloride 3 ~ 5 kg. For rapeseed field with sufficient basal fertilizer, sufficient seedlings, and strong growth, no Miaofei and wax fertilizers can be applied, and for rapeseed fields where no basal fertilizer or basal fertilizer is used in an insufficient amount and the sowing date is late, rapeseed fields where growth is retarded or is not released are used. Miao fertilizer should be applied as soon as possible, urea 7.5 kg per mu application, and promote growth and transformation; uneven growth of the plot, can be applied as appropriate, Miao Fei promote balance. Spraying regulators to control and promote the growth of strong winter before spraying Bijing 0.136% erythrazine yi wettable powder and other growth regulators to promote winter rapeseed growth and improve winter frost resistance. For rape that grows too prosperous, use 15% paclobutrazol WP for 30-40 grams of water plus 40 kg of water to promote strong growth, prevent premature pods and early flowers, increase plant antifreeze capacity, and achieve strong seedlings through winter. Strengthen the management of pests and weeds. For fields that have not been closed and weeded, use high-efficiency flupirizuride to control weeds as soon as possible and use herbicides to prevent broad-leaved weeds. Seedling stage mainly to prevent damping-down and downy mildew disease, damping-off disease can be used to prevent and control moldy mildew, downy mildew can be used to prevent and control a mildewing; bud stage and early flowering stage to control Sclerotinia, available carbendazim , Thiophanate-methyl, sclerotium and other drugs spray control.