Spinach overwintering to catch up with overwintering fertilizer

Autumn spinach is a winter vegetable sown in autumn and harvested in spring. It takes more than 100 days from November to early March and April of the next year. Therefore, under the condition of long-term low temperature, how to ensure safe winter is the key to harvest. Put some cold water on it. Freezing water must be "certain" and "suitable". "Certain" is to decide whether to irrigate frozen water according to the amount of soil moisture. Generally, the absolute water content of sandy loam soil is less than 15%, loam soil is less than 17%, clay soil is less than 20%, frozen water should be poured. "Two suitable" means timely watering and proper watering. The appropriate time for watering frozen water is that the soil tillage layer can be thawed during the day, and when there is freezing at night, proper watering means that the frozen water amount cannot be too large or too small, and it is generally appropriate to connect the soil moisture. Follow up the winter fertilizer. Topdressing winter fertilizer can increase soil nutrient content, play a role in winter fertilizer spring, promote weak to strong. Especially for the vegetable fields with less fertilizer, poor soil fertility and weak seedling situation, it is more important. Therefore, should be combined with irrigation frozen water dressing winter fertilizer, general mu application urea 10 kg or ammonium sulfate 20 kg, with water dressing. Cover against cold. The absolute low temperature in the cold period in the north is very unfavorable to the safe overwintering of vegetable seedlings, so mulch should be used to prevent cold and ensure the safe overwintering of seedlings. Mulching can generally be carried out after the topsoil has completely frozen. Mulch is rich in organic matter and crushed farm manure, mu sprinkle about 1000 kg.