Autumn spinach is an overwintering vegetable harvested in autumn and spring. It starts wintering in November to return to green in March and April of the next year, and it takes more than 100 days. Therefore, under long-term low temperature conditions, how to ensure safe wintering is the key to harvest. .
Pour in frozen water. Pouring frozen water must be "certain" and "two suitable". "Sure" is to decide whether to irrigate frozen water or not according to the amount of soil moisture. Generally, the absolute moisture content of sandy loam soil is less than 15%, loam soil is less than 17%, and frozen water should be poured when clay is less than 20%. "Two suitable" is watered at the right time and the right amount. The proper time to seal frozen water is that the soil plow layer can thaw during the day, and when it is frozen at night; proper watering means that the amount of frozen water cannot be too large or too small, and it is generally suitable to connect the bottom.
Keep up with winter fat. Topdressing overwintering fertilizer can increase soil nutrient content, play a role in winter fertilizer spring, promote weak growth. It is especially important for vegetable fields with low bottom fertilizer, poor soil fertility and weak seedling conditions. Therefore, the wintering fertilizer should be applied in combination with pouring and freezing water. Generally, 10 kg of urea or 20 kg of ammonium sulfate is applied per acre, and the fertilizer is applied with water.
The cover is cold-proof. Absolute low temperature in the severe cold period is very detrimental to the safe wintering of vegetable seedlings. Therefore, coverings should be used to prevent coldness to ensure that seedlings are safe for wintering. Covering can generally be performed after the soil in the plow layer has completely frozen. The covering is organic fertilizer that is rich in organic matter and smashed and pulverized. It can be sprinkled about 1,000 kilograms per mu.
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