The defense against freezing injury is the key to the cultivation of rapeseed in high yield. To ensure safe wintering of rapeseed, in addition to using medium-late-maturing varieties with strong cold resistance, high yield, and stable production, appropriate technical measures must be taken to improve the cold resistance of rapeseeds and to prevent freezing damage. 1. Strengthen fertilizer and water management (1) Early application of Miaofei and skillful application of wax fertilizer. Early application of Miao Fei can make rape early roots, early absorption of nutrients, accelerate growth. Then, during the process of gradual decline in temperature, it is subjected to low-temperature exercise, which turns into an old healthy seedling, and the ability to resist coldness increases. Apply a wax fertilizer once after the winter solstice. Shila fertilizer can not only increase the soil temperature and reduce the freezing injury, but also provide more nutrients for the steady growth after spring. The wax fertilizer is mainly organic fertilizer, and it is spread evenly among the rapeseed plants. It can be filled with earth seams, and the roots can be insulated to prevent freezing damage. According to growing seedlings, the application of P and K fertilizers can improve the anti-freezing ability of rapeseed. (2) Qiao irrigation winter water, pouring pouring manure. Irrigation is conducted before freezing, and it is advisable to completely drain the water within one day and not to accumulate water in the field. The irrigation of rapeseed during the winter has certain positive effects on adjusting the surface temperature of the field and reducing the temperature difference between day and night. Under conditions of severe drought, timely irrigation after freezing can promote the tight integration of the roots of rapeseed with the soil, which will help stabilize the roots. Before the advent of the cold current, pouring 1,000 kg of diluted manure water per acre could make the soil less susceptible to ice formation and prevent root extraction. Roots and roots in the soil are used to increase the coverage of the cultivator to loosen the soil, promote new roots, and increase soil temperature. Rapeseed root neck exposed to the most vulnerable to cold, combined with cultivator before weeding in the soil for rooting, has a certain effect on the reduction of root extraction. The combination of warming fertilizer and earthing before the freezing protects the neck of the rapeseed and has better antifreeze effect. Clearing up the "three ditch" to thicken the root soil layer is also beneficial to keep warm and prevent freezing. If the weather suddenly turns cold, you can cover the straw in the rape leaf surface, apply a layer of grass and wood ash between the plants, protect the leaves, and mitigate the attacks of cold wind on the root of the rapeseed. 3. Doing a good job of chemically regulating rapeseed paclobutrazol leaves can make vegetable seedlings dwarf, leaf color deepens, thickening leaves, but also can effectively prevent early bolting, adjust plant type, enhance the ability of plants to resist cold and prevent frost damage. Generally in the middle of December depending on the growth of rapeseed, per acre with 15% paclobutrazol 50 ~ 100 grams, add 50 kg of water spray. 4? To prevent early inflorescence early rape early flowers, cold tolerance, and vulnerable to freezing injury. For the well-growing, prematurely convulsing budding plots, it is possible to inhibit reproductive growth and delay convulsions by deeply cultivating and damaging parts of the root system. Early onset of picking should be selected on sunny days before the onset of low temperature, in order to suppress the top growth advantage, delay the growth period, and enhance the plant's ability to keep out the cold. Immediately after the picking, the quick-seeding fertilizer should be applied immediately, and 5 kg of urea or 10 kg of ammonium bicarbonate should be applied per mu to promote the growth of rapeseed. 5 mulching mulching plastic film cover, not only can heat, increase temperature, prevent frost damage, but also to maintain water, protect fertilizer, promote the robust growth of rapeseed, improve rapeseed own cold resistance. China Agricultural Network Editor