Before the cold wave comes or during the cooling period, take measures according to local conditions, and strive to reduce the harm to the growth of rape. The following suggestions are provided for reference by relevant departments and farmer friends:
1. Cultivating soil before cultivating the soil before freezing can loosen the soil and thicken the root soil layer, which has a certain effect on blocking the invasion of cold wind and improving the ability of heat absorption and cold resistance. Especially for tall seedlings, the rhizomes become shorter after warming the soil, which is helpful for keeping warm.
2. Reapplying Winter Fertilizer Before the arrival of severe cold, top application of wax fertilizer and additional application of phosphorus and potassium fertilizers can not only significantly enhance the cold resistance of rapeseed, but also supply nutrients in overwintering period and bolting and flowering period to ensure balanced growth in the later period.
3. Straw covered with straw, chaff or other crop straw to cover the cold between the rows of rapeseed to keep warm, can reduce the direct attack of cold wind. Before the cold wave comes, a layer of chaff ash, grass ash, fire ash, etc. can be sprinkled on the rape leaf surface to prevent the leaves from freezing.
4. Irrigation and frost protection Before freezing or severe cold, water the rape field in time to avoid a large drop in ground temperature and relieve the degree of frost damage, especially for preventing dry freeze. At the same time, after irrigation, the root system is closely integrated with the soil, which is beneficial to the absorption of water and nutrients by rape. After freezing, the trench should be drained in time to avoid root damage caused by waterlogging.
5. If the early moss rape is removed, a large amount of nutrients will be consumed and the plant's cold resistance will be weakened. The moss should be picked in time to reduce the degree of freezing damage. Picking the moss is carried out at noon on a sunny day. After picking the moss, timely apply an appropriate amount of quick-acting nitrogen fertilizer to promote the growth of rape and prevent freezing damage.
Ecological and Agricultural Meteorological Center of Hunan Meteorological Bureau
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