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Rape seedling management and spring management
Rape should be planted with 12,000 to 15,000 plants per acre, and the number of emergences should be far beyond this range. Therefore, after the emergence of rape, seedlings should be promptly sparse to prevent emergence of tall seedlings. 5 true leaves when Dingmiao, Dingmiao spacing 13 ~ 16 cm. Rape is very vulnerable to ground pests and underground pests during the seedling period. Therefore, farmers’ friends should check in time and spray pesticides in time. Rapeseed should also be managed in the fields such as cultivating and weeding, watering and fertilizing in the seedling and spring. Pouring overwintering water for safe wintering canola is an effective way to increase soil moisture, increase ground temperature and prevent cold damage to rape. Winter irrigation should generally be performed before the soil is frozen at the end of December. If you can apply fertilizers such as ash in the winter, you will have better antifreeze effects. The key point of spring management is that the growth of fertilized and watered rapeseed before winter is mainly vegetative growth. From the turning green period, it is transformed into the vegetative growth and reproductive growth period, and then enters the period of reproductive growth. The demand for water and fertilizer in rapeseed during the spring return period is the most urgent. Therefore, farmers' friends must perform field management in a timely manner. The application of spring fertilizer should be determined by seedlings. Large seedlings and Wang Miao can be applied less or not. Small seedlings and weak seedlings should be applied. In order to prevent the excessive application of spring fertilizer to cause rape to grow, it is also possible to apply the spring fertilizer to the wintering period in advance. This will not only make up for the shortage of wax fertilizer, but also increase the number of long roots and leaves in the overwintering stage to achieve the purpose of strong seedlings. , But also can be used wax fertilizer spring, promote early spring after rape. If there is little rain and snow in winter and soil moisture is poor, it is also necessary to cooperate with the application of green manure and pouring back to Qingshui, followed by cultivating and weeding, in order to achieve the objectives of soil conservation, soil loosening, weed control and elevation of ground temperature. Lei Lei period is the fastest growing period of rapeseed life, vegetative growth and reproductive growth are very strong, urgent requirements for nutrients, Shilei should be chasing fertilizer as appropriate. The budding manure should be reapplied early, that is, when it is about 5 cm high.