Cold weather, high humidity in the field, and lack of light are detrimental to the growth and development of vegetables. The focus of field management is freezing and keeping warm, draining the gutters, raising the surface of the car, enhancing the air permeability of the car, and increasing the temperature of the ground. Seedling period appropriate to reduce the amount of nitrogen fertilizer, avoid partial nitrogen fertilizer, so as to avoid the growth of young plants, cold resistance is poor. Top dressing is early, in order to promote vegetable seedlings. Before applying low-temperature nitrogen fertilizer, it is advisable to spray 0.2%-0.3% potassium dihydrogen phosphate 1-2 times. Using sunny days, use 100-150 kg of warm manure such as pig dung or compost, and apply it to the root of the rapeseed meal to raise the soil temperature by 2-3°C. With piles of weeds, straw, litter and other piles, except for the ignition point, the rest was lightly compacted with dry fine yellow mud, before the onset of frost, a fuming smoke ignited at the ignition point of the top wind. If there is an open flame, seal it with fine soil. Before the onset of low-temperature freezing damage, sprinkle a thin layer of hull ash or ash on vegetables, or sprinkle 50 kg of wood ash or green earth ash between vegetable rows. This can prevent cold, freeze, increase fertilizer, and root rot of cruciferous vegetables. Disease has better control effect.
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