Management skills of vegetables in greenhouse in Winter

1. In case of severe cold, the following measures can be taken: multi-layer covering, covering the shed again in the shed, or covering a layer of film on the grass to increase the heat preservation effect; digging the cold-proof ditch outside the shed early can increase the temperature inside the shed by 2m / 3C.

2. If you encounter continuous overcast weather, if the temperature is not too low, you can open the grass curtain. Hanging a reflective curtain on the back wall of the greenhouse will also increase the light and temperature on a cloudy day. In order to improve the ground temperature, plastic film should be covered earlier when there are more cloudy days in winter, which can reduce the occurrence of low temperature and freezing injury. In winter, the temperature in the greenhouse should be kept above 12 degrees Celsius. When the temperature is too low, measures can be taken to increase the temperature.

3. in case of snowy weather, you can not cover the grass grass when it snows during the day, and sweep the snow off the shed immediately after the snow stops. In order to strengthen the heat preservation, cover the grass grass with a thin film in the afternoon. It snows at night. Sweep the snow in time after the snow stops the next day in order to keep the grass grass dry. When it quickly clears up after continuous overcast and snowy weather, it should be opened at intervals or 1/3. At the same time, pay attention to observe the changes of seedlings and find wilting. Cover the grass immediately and open it again after recovery to prevent "flashing shed".

4. Remedy after freezing. After freezing, to make the temperature in the shed rise slowly, do not close the shed immediately to warm up, so as to avoid vegetable tissue necrosis due to a sudden rise in temperature. Cut off frozen fruits and stems and leaves in time to avoid tissue mildew.

5. Do a good job in routine management. Uncover the cover at the right time. The mulch should be opened in time when about 70% of the seedlings emerge, so that the seedlings can gradually see the light. Re-cover the mulch at night to prevent freezing seedlings.

6. Timely ventilation and humidity reduction. With the increase of the temperature in the seedling bed and the external air temperature, it is necessary to increase the ventilation rate and control the humidity in the seedling facilities.

7. Prevent the seedlings from growing too much. It can be inhibited by spraying Daizhuangsu, and it can also enhance the disease resistance and cold resistance of seedlings, but the high concentration can easily cause the aging of vegetable seedlings.

8. Strengthen the management of temperature and light. In the aspect of light management, the covering material with good thermal insulation and light transmittance should be selected as far as possible, and multi-functional composite film is recommended.

9. In terms of temperature management, appropriate regulation and control should be carried out according to the different temperature requirements of different vegetables and different growth periods, and the cold prevention and heat preservation of facilities should be done well in winter to avoid the adverse effects of sudden cooling on seedlings and vegetables.

10. Timely prevention and control of diseases and insect pests. Vegetables are prone to quenching, blight and gray mold in the process of seedling growth. In the prevention and control of diseases, prevention-based strategy should be adopted, chemical control treatment should be carried out once a week, and fumigant instead of spray control should be recommended in cloudy and rainy days.