Winter rapeseed production freeze protection measures

Before the onset of the cold wave or during the cooling period, measures should be taken according to local conditions and efforts should be made to reduce the harm to the growth of rapeseed. The following suggestions are proposed for reference by relevant departments and farmers:

1. The cultivating soil before cultivating the soil in the cultivator soil 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 endothermic insulation and cold resistance. In particular, after planting earthworms, roots and stems become shorter, which is conducive to keeping warm.

2, re-application of winter fertilizer before the arrival of the cold, the application of wax fertilizer, increased phosphorus and potassium fertilizer, can significantly enhance the ability of rape cold resistance, but also can supply wintering and bolting flowering nutrition, ensure balanced growth later.

3, covered with cold straw, chaff or other crops straw covered in the rape between the warm, can reduce the direct invasion of cold wind. Before the onset of the cold wave, a layer of hull ash, grass ash, and fire ash on the surface of rapeseed can be sprinkled to prevent the leaves from freezing.

4, irrigation freezing or cold before the advent of timely irrigation of rapeseed fields, can greatly reduce the temperature to reduce the extent of frost damage, especially to prevent dry freeze better. At the same time, after irrigation, the root system is tightly integrated with the soil, which is beneficial to the absorption of water and nutrients by rape. After freezing, drainage should be cleared in time to avoid rooting due to waterlogging.

5, removal of early moss seedlings If early moss early flowering phenomenon will consume a lot of nutrients, so that the ability of plants to weaken the cold, should pick the moss in a timely manner, can reduce the degree of frost damage. Picking moss is done at noon on sunny days. After picking the moss, timely apply the appropriate amount of available nitrogen fertilizer to promote the growth of rape and prevent freezing damage.

Hunan Meteorological Bureau, Ecology and Agrometeorological Center