The steps to prevent freezing of rapeseed have the following four points:
First, the wax fertilizer should be reapplied. In the row of rapeseed, the application of soil fertilizer, manure, human excrement, grass ash and other fertilizers can increase the ground temperature by 2 to 3 °C, which can prevent cold and keep warm, and can also play the role of winter fertilizer and spring.
Second, phosphorus and potassium fertilizers should be added. Phosphorus can promote the development of rapeseed roots and enhance the resistance of rapeseed; potassium can improve the ability of rapeseed to resist cold, disease and lodging. Therefore, the application rate of nitrogen fertilizer should be properly controlled or reduced during the application process to avoid the plant being tender and juicy, and the cold resistance is deteriorated.
Third, film protection. It can spray new high-fat film + tree guard general, and can form a fluorescent protective film on the surface of rapeseed to have the effect of suffocating sterilization, preventing virus replication and infection, anti-frost and anti-freezing damage. Crop straws (such as straw, wheat straw) can also be covered in the rows of rapeseed. Generally, 200-300 kg of straw is covered to reduce the damage of the cold wind to the roots.
Fourth, cultivating soil. Combined with cultivating, the soil can be rooted, which can loosen the soil, improve the ground temperature, and protect the roots of rapeseed. It is beneficial to the growth and development of the root system. The soil should be carried out before the closure, but it should be noted that the root system cannot be damaged when the soil is rooted. Otherwise it will cause rotten roots.
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