1. Temperature: Before first frost, the northern area will begin to lay plastic film in early or middle June. At this time, the temperature is still high during the day, and the bottom of the shed film should be uncovered during the day and at night. Later, with the decrease of natural temperature, you should show your feet during the day and buckle your feet at night. If the temperature drops again, you should seal your feet during the day. If you encounter high temperature in the future, you can open the greenhouse door and let the air out a little.

2. Moisture: 4-5 days after sowing, the seedlings should fully grow. Water the soil surface when it is dry before emergence, and water the surface after emergence. In short, the soil surface should be kept moist to promote the growth of spinach. Water 2 ~ 3 days before film mulching, and do not water after film mulching until harvest.

3. Disease control: Spinach in greenhouse is easy to get downy mildew in autumn, so it is very important to do a good job of control.

Prevention and control method: after watering 2 ~ 3 days before plastic film buckle, spray a medicine to prevent downy mildew, such as? 2% zinc biuret 600 ~ 800 times solution. If downy mildew is found after the shed is closed, smoke agent should be used to control it. If 10% chlorothalonil smoke agent is used 300-400g per mu, once every 7-8 days, and used for 2-3 times, the spread of downy mildew can be effectively inhibited.