Management measures of leafy vegetables in facilities in winter

Winter facilities leafy vegetables planting mainly cold-resistant, semi-cold-resistant leafy vegetables, such as small rape, spinach and so on. Winter greenhouse leafy vegetables management mainly pay attention to the following aspects:

1. Humidity. Reasonable irrigation is the main measure to adjust the humidity of greenhouse in winter. Irrigation is mainly small water, and flood irrigation is avoided. The watering time should be selected from 10:00 a.m. to 12:00 noon, so as to cooperate with ventilation to discharge excess moisture and reduce the relative humidity of air at night. Due to the closed environment in the greenhouse, soil moisture and plant transpiration moisture are not easy to escape, resulting in high humidity in the greenhouse. Reduce humidity and properly open the tuyere.

2. Temperature. Although leafy vegetables are resistant to low temperature, the greenhouse should also pay attention to heat preservation in winter, keeping the temperature at 20 ° C during the day and 5 ° C at night, so as not to make the temperature too low to avoid freezing damage. Too high temperature will cause excessive growth of plants and affect quality. The temperature can be controlled by the time of uncovering the insulation blanket. Generally, the insulation blanket is unwrapped at about 9:30 a.m. in sunny weather and the insulation blanket is unwrapped at 16:00 p.m. When continuous cloudy days for 3-4 days or longer occur, the time from 11:00 noon to 14:00 pm should also be used to open the heat preservation so that the plants receive some scattered light, which is conducive to the growth and development of the plants.

3. Pest control. In accordance with the principle of "prevention first, comprehensive control", adhere to the principle of "agricultural control, physical control and biological control first, chemical control using smoke method, pay attention to rotation of drugs, reasonable mixing, strict control of pesticide safety interval. Shang Chaoju