Cover grass protection. Before the onset of frost damage, a layer of crop stalks or a layer of turfgrass ash shall be placed on the rapeseed in order to reduce the damage caused by cold winds.
Irrigation antifreeze. Before the cold current comes, pour water once to stabilize the temperature and prevent it from freezing. The irrigation after freezing should be carried out at noon on a sunny day so that the topsoil covered by the frozen protrusions is solid, ensuring that the roots of the rape are in close contact with the soil.
Post-freeze management. Check the seedlings in time after the cold has flown, and found that the seedlings in the frozen seedlings help the seedlings, remove the stagnant water in the rainy and snowy weather as soon as possible, and spray the new high-fat film immediately after thawing to reduce the evaporation of water and prevent the loss of water.
Increase the application of phosphorus and potassium fertilizers to improve cold resistance, disease resistance and lodging resistance of rapeseeds. Apply 1000-1500 kg of cattle dung per acre or 2500-3000 kg of earth miscellaneous fertilizer per acre before winter, and increase soil temperature by 2°C~3°C.
Foliar spraying fertilizer. Spraying potassium dihydrogen phosphate, vigor, Huimanfeng and other fertilizers before winter can improve the cold resistance ability of rapeseeds. Boron-deficient rape should be sprayed with 0.2% borax solution. Spray fertilizer should be mixed with new high-fat film to increase fertilizer efficiency and prevent infection by pathogens.
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