One must apply early and reapply
The seedling fertilizer is applied twice, the first time after transplanting the live tree (live seedlings after the seedlings are fixed), generally from the beginning of November to the end of November, re-application of nitrogen fertilizer, 5-6 kg of urea is suitable for application; The seedling fertilizer (or wax fertilizer) is applied once more in the middle of December, and it is best to use farmyard manure.
It is necessary to cultivate weeding: cultivating can loosen, improve soil aeration and physical and chemical properties, increase ground temperature, eliminate weeds, and contribute to soil microbial activity and rooting of rapeseed. Generally, after transplanting live trees (live rapeseed in 4-5 true leaves), shallow cultivating is carried out, 3-5 cm deep, followed by cultivating seedlings after cultivating; the second time is deep cultivating before the end of November. Deep 7-10 cm, it is best to combine the application of wax fertilizer, roots and soil, to protect against freezing. To classify operations, early-planting, early planting, fertility, and good-growing rapeseed should be deep-cultivated to cut off part of the root system and control the growth of the aboveground part; for late-casting and seedlings, it is necessary to combine the topdressing and promoting the strong seedlings.
Second, we must apply the fertilizer
In the middle of the winter solstice to Xiaohan, the application of soil fertilizers such as soil dregs, manure, grass ash and soil fertilizers can not only meet the needs of winter rapeseed vegetative growth and reproductive growth, but also provide early spring rapeseed. Nourishment, this is the spring of wax fertilizer. The fertilizer can improve the soil temperature, keep warm and freeze, and has a greater effect on reducing the root damage of seedling roots.
Third, we must fight drought in time.
During the wintering period, the rapeseed plants are smaller, the roots are shallower, and the drought-resistance and anti-caries ability are poor. At this time, if there is drought, it should be timely to resist drought, so as to facilitate the adjustment of the field temperature difference, thereby reducing the freezing damage caused by the cold wave and promoting the safe wintering of rapeseed.
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