In order to avoid damage caused by low-temperature freezing damage to field crop rape, the following anti-freezing and freezing prevention measures are proposed. 1, cultivator soil. It can loosen the soil and thicken the root soil, which not only increases the soil temperature, but also enhances the absorption capacity of the root system, which has a certain effect on improving the cold resistance of rapeseed. 2, increase phosphorus and potassium fertilizer. Can effectively enhance the cold resistance of rapeseed, rapeseed is now in combination with rapeseed cultivating soil, according to the conditions of the seedlings and determine the amount of fertilizer, a type of seedlings without nitrogen fertilizer, increase the application of phosphorus and potassium fertilizer, the general Mushi calcium 20 - 25kg, potassium fertilizer 5kg; second and third types of seedlings less nitrogenous fertilizer, re-applied phosphorus and potassium fertilizer, usually mus urea 5-10kg, calcium 25-30kg, potash 5-8kg. For rape that is in its flowering period, measures of extra-root fertilizers can be taken to enhance the cold resistance of rapeseed. Spray 1-2% concentration of Praseatic Calcium Clear Solution or 0.2% Potassium Dihydrogen Phosphate 2-3 times. 3, smoke protection against freezing. On the low-temperature nights, weeds, sawdust, husks, rice straw, etc. are used for smoke prevention and frost protection at the rape field to cover the ground with a layer of smoke to form a farmland microclimate and prevent the occurrence of frost damage. 4, irrigation antifreeze. Irrigation can make the roots and soil tightly combined, which is conducive to the absorption of water and nutrients by rape, and can also increase the soil salt capacity, ease the temperature difference, and mitigate the degree of frost damage. Irrigation should speed irrigation speed, keep the soil moist. 5, cover cold. Between the rows of rapeseed covered with rice straw, chaff or straw, it can increase the soil temperature. When the cold wave approached, the temperature dropped to 0°C, and other measures could not be reached. In the case of rapeseed foliage and fields, a layer of vegetation ash, clam shells, etc., could prevent the leaves from freezing.
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