Raise sown in autumn is prone to freezing damage. How should we take preventive and control measures at this time?

Due to manual management such as soil loosening and weeding in the rapeseed field, the soil fell into the box ditch, middle ditch, and surrounding ditch. On the surface, the ditch seemed to be open, but in rainy and snowy weather, the dry The soil swells when exposed to water, causing blockage and easily causing water accumulation in the field. Before overwintering, you can spray foliar fertilizers. The "universal fertilizer" potassium dihydrogen phosphate is the most suitable here. This can improve the growth and resistance of rapeseed, especially the latter, which is very beneficial to its overwintering.

Before winter, rapeseed must be deeply hoeed. During the deep hoeing process, the roots of the rapeseed should be covered with soil. The height of the soil should be close to the leaves of the rapeseed. Generally speaking, winter varieties are stronger than spring varieties, and late-maturing varieties are stronger than early-maturing varieties. In production, medium-late maturing varieties with strong cold resistance, high yield and stable yield should be selected. The planting of Ningyou series and Suyou series varieties should be actively promoted in Daibu Town.

Before freezing, open drainage ditches in time to eliminate waterlogging, lower the groundwater level, and reduce soil moisture content to facilitate the growth of rapeseed, while increasing the ground temperature and enhancing the ability to resist cold, warmth, and frost. If the soil is dry, water it before it freezes to reduce the temperature difference between day and night. You can water some water in the rapeseed in advance. This water will avoid the temperature in the soil from dropping sharply and can effectively control the temperature of rapeseed growth. Even if the cold comes, the temperature of the soil will not By dropping significantly, canola will be protected from frost damage.

After the rape seedlings emerge, careful management is required to ensure that the seedlings survive the winter. After the rapeseed seedlings emerge, the seedlings must be determined in time, and pesticides should be sprayed to prevent pests and diseases, so as to promote the rapid growth of the seedlings and accumulate nutrients and dry matter. When necessary, phosphorus and potassium fertilizers can be applied appropriately. Before winter, you can add plant ash, farm-made rotten manure, soil fertilizer, etc. between the rows of rapeseed, which can increase the low temperature by 2-3 degrees and play a role in preventing cold and keeping warm. It can also be used as fertilizer in winter and spring, which will be beneficial to the coming year. The growth of rapeseed in spring is very beneficial. Some chaff, straw and other objects can be covered between the rows of rapeseed to prevent cold. This is like wearing a suit of clothes for the rapeseed, which can effectively reduce the direct invasion of cold wind.