In rapeseed production, comprehensive antifreeze measures should be taken for different reasons of frost damage. The first is to select varieties with strong cold resistance; secondly, the sowing date should be reasonably arranged according to the characteristics of the varieties. Early sowing and early planting of varieties with strong winter can increase dry matter accumulation, realize early growth of strong seedlings, and improve antifreeze ability. At the same time take the following technical measures to prevent freezing damage:

1. Follow-up Miao Fei, grasping strong seedlings to prevent freezing before winter should seize the favorable opportunity to chase Miao Fei, especially the late planting seedlings and live later seedlings, we must pay close attention to cultivating loose soil, fertilization, thinning, filling seedlings to Promote the vegetative growth of rapeseed before winter, form a strong root system, more differentiated leaves and flower buds. Phosphorus and potassium fertilizers should be applied at the seedling stage. Phosphorus can promote the development of rapeseed roots and enhance rapeseed resistance. Potassium can improve the ability of rape to resist cold, disease and lodging, and the amount of nitrogen fertilizer should be controlled or reduced to prevent plants from becoming softer. Juice, cold resistance worse.

2. The height of cultivated soil in the cultivating field is generally suitable for culturing the first leaf of the base, which can loosen the soil and increase soil temperature, and can directly protect the root, which is beneficial to root growth and root extraction.

3. Fill the winter water with winter water. It is best to fill it in the month before winter. Pre-winter irrigation can reduce the temperature difference between day and night, improve the microclimate in the field, ease the cold attack, and prevent dry frozen seedlings. Overwintering water should be poured and perfused.

4. Extirpation of early winter early rapeseed winter rapeseed should be removed before the beginning of spring flowering should be removed in order to reduce frost damage, picking must apply topdressing nitrogen fertilizer once, so that the plant nutrients can be compensated to promote its recovery and promote hair Branches, increase the number of pods.

5. Re-apply wax fertilizer can be added in the rapeseed rows of miscellaneous fertilizer, circulatory fertilizer, human waste, turfgrass and other fertilizers, can increase the temperature 2 ~ 3 °C, play a warm and cold effect, but also can play winter fertilizer Spring effect.

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