How to keep warm and humidify tomato cultivation in overwintering season?

Now is the time to cultivate overwintering tomatoes, because the planting efficiency of this crop of tomatoes is relatively high, so they are widely planted in Henan, Hebei, Shandong and other northern provinces in China. In overwintering tomato cultivation, heat preservation and humidification is a necessary planting skill, so how to keep it warm and humidify?

1. Increase the permeability of greenhouse film.

The use of high light transmittance without plastic film, timely cleaning of the return journey on the greenhouse film, snow, etc., can increase the light and improve the temperature of the greenhouse.

2. Improve the heat preservation of grass curtain.

The grass curtain covered on the greenhouse is required to be thick and sturdy. In order to improve the heat preservation performance, in order to prevent rain and snow from getting wet, the grass curtain can be covered with a layer of ordinary agricultural film or fragrant old film.

3. Increase the thermal insulation of the rear wall

When building the rear wall, you can stick a layer of brick on the earth wall, or build a hollow thermal insulation wall filled with straw or polystyrene foam board, the effect is also very good, the fire wall can be built directly in cold areas to increase the temperature.

4. Dig cold-proof ditch outside the shed

Dig 40-60 cm deep, 40-50 cm wide cold ditch, fill in sawdust, weeds, horse dung, straw and other thermal insulation materials, firmly cover the soil to seal the ditch, in order to achieve the effect of heat preservation.

5. Set up temporary heating measures

2-3 radiators with a power of 1600-2500 watts can be set in the shed. The outlet direction of the heater can not be directly tilted to the tomato and can be inclined to the north wall. It can be moved every 10-15 minutes. Can also use the method of smoking, or should pay attention to the inside can not use charcoal fire, coal stove, to prevent personnel and plants from carbon monoxide poisoning.

6. Hang the reflective screen

Hanging reflective curtain can not only increase the light in the greenhouse to promote the coloring of fruits in the greenhouse, but also increase the temperature in the greenhouse. The method is to hang a plastic film or tin foil coated with a metal layer on the inside of the back wall, hanging one meter every 2-3 meters. The hanging of the reflective curtain reduces the heat absorption of the wall, increases the temperature in the shed by 2-3 degrees, and increases the illumination in the shed at the same time. Promote the coloring of tomato fruit.