How to overwinter and preserve autumn spinach seedlings? A full analysis of the key technical points
Autumn spinach is an overwintering vegetable sown in autumn and harvested in spring. It begins overwintering at the end of November and turns green again in early March of the following year, a period lasting more than 100 days. Therefore, under long-term low-temperature and dry conditions, how to ensure safe overwintering is the key to achieving a bumper harvest. 1. Water the freezing water well. Watering the freezing water must achieve "one determination" and "two suitability...
Autumn spinach is an overwintering vegetable sown in autumn and harvested in spring. It begins overwintering at the end of November and turns green again in early March of the following year, a period lasting more than 100 days. Therefore, under long-term low-temperature and dry conditions, how to ensure safe overwintering is the key to achieving a bumper harvest.
1. Water the freezing water well. Watering the freezing water must achieve "one determination" and "two suitability". "One determination" means deciding whether to water the freezing water based on the soil moisture content. Generally, when the absolute moisture content of sandy loam is below 15%, loam is below 17%, and clay is below 20%, the freezing water should be watered. "Two suitability" means watering at the right time and in the right amount. The suitable time for watering the freezing water is when the soil plough layer can thaw during the day and freezes at night. Watering in the right amount means the amount of freezing water must not be too much or too little. Generally, it is suitable when it connects with the subsoil moisture.
2. Apply the overwintering fertilizer well. Applying overwintering fertilizer can increase the soil nutrient content, serve the purpose of using winter fertilizer in spring, and promote weak seedlings to become strong. This is especially important for vegetable plots with little base fertilizer, poor soil fertility, and weak seedlings. Therefore, the overwintering fertilizer should be applied together with watering the freezing water. Generally, 10 kg of urea or 20 kg of ammonium sulfate per mu is applied with the water.
3. Mulch for cold protection. In the severe cold period in northern regions, the absolute low temperature is very unfavorable for the safe overwintering of vegetable seedlings. Therefore, mulch should be used for cold protection to ensure the safe overwintering of seedlings. Mulching can generally be carried out after the soil in the plough layer has completely frozen. The mulch is farmyard manure rich in organic matter and crushed and finely broken up. About 1000 kg per mu is spread.