What are the key management techniques for planting green onions in winter?

I found this answer on the website of China Education Union, for your reference only! 1. Water in time: water immediately after planting. The water should not be too big for the first time to prevent the onion ditch from collapsing. Water the seedlings every 5-6 days. Then water every 7-8 days 1 time to keep the soil moist. After the heavy rain, the accumulated water in the ditch should be removed in time to prevent the accumulated water from rotting roots and dying seedlings. After the first frost 10 ~ 15 days, water 1 water. Pour another layer of ice water on the "Winter Solstice".

2, the formula topdressing: In winter, green onions can generally be topdressing 3 times. The first topdressing was carried out when the seedlings grew slowly and began to grow vigorously. Apply 8 kg of urea and 8 kg of ternary compound fertilizer to one fifteenth hectare. The second topdressing is from "cold dew" to "first frost". The third topdressing was carried out between "beginning of winter" and "Xiaoxue", and 20 kilograms of urea and 20 kilograms of potassium fertilizer were applied every 15 hectares. Besides topdressing, foliar spraying should be carried out, and spraying ferrous sulfate, ammonium molybdate, copper sulfate and manganese sulfate with the concentration of 1000 times can increase the yield by more than 10%.

3. Soil: topdressing each time, watering once and ridging once. It is advisable not to bury the heart leaves, and it is advisable not to exceed the "five-pronged" shares. Soil tillage should be carried out under the condition of moderate soil water content and no clods, and attention should be paid to avoiding dew in the morning. Be careful not to hurt onion leaves and cause diseases when cultivating soil.