The wintering period of rape is the period from the lowest temperature in January to the beginning of the spring. At this time, the temperature is extremely low, and the growth of rapeseed is very slow, which is an adaptability to resist low temperatures. However, the organization of rapeseed is relatively soft, the body contains more water, cold resistance is not as strong as wheat crops, and it often suffers from frost damage and affects yield. At present, rapeseed is in the wintering period, and it is the most critical period to strengthen rapeseed for stable winter. Five effective technical measures need to be taken.
First, re-apply wax fertilizer. Apply organic fertilizer such as manure, compost, grey manure, or human waste in the rapeseed line to increase the soil temperature by 2 to 3°C to ensure nutrient supply during winter or during flowering and flowering. In particular, the intracellular potassium content is increased and enhanced. The water holding capacity of the cells is not easy to freeze at lower temperatures; increasing the concentration of soil solution and salt, so that the soil is also not easy to freeze, reducing rooting phenomenon.
Second, cultivator soil. The cultivation of rapeseed by cultivating the soil can not only increase the soil temperature, but also directly protect the roots, promote root growth and prevent rooting.
Third, clean ditch drainage, remove snow and ice. Not only can avoid excessive waterlogging, hinder root growth, but also avoid water ice, night freezing, increase frost damage, play a role in insulation, promote root protection leaves, help strong seedlings overwinter.
Fourth, irrigation or sprinkle gray antifreeze. Watering before freezing can reduce the temperature difference between day and night, improve the microclimate in the field, ease the cold attack, and prevent dry frozen seedlings. It is also possible to apply a thin layer of hull ash or ash on the leaf surface of rape, which has a certain effect on preventing freezing damage.
Fifth, timely removal of early death and early flowers. To prevent cold and prevent freezing, to obtain high yield of rapeseed, to cope with plants that have emerged as early as early and early flowering, pick up in time, inhibit the top growth advantage, change the way of the nutrient running in the plant, make the nutrient distribution center of gravity, from the main stem to the lower part Promote branch development. After picking the pods, we must timely apply the quick-effect fertilizer, promote branching, increase the fruit area, and increase the yield and quality of rapeseed.
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