How do greenhouse vegetables spend the winter?

1. When building a vegetable greenhouse. If the ground in the vegetable greenhouse sinks more than half a meter below the frozen soil layer, the soil temperature of the ground crops sinking relative to the horizontal ground will be higher. At the same time, due to the subsidence of the ground inside the vegetable greenhouse, the space inside the greenhouse will become larger, which is conducive to heat preservation. Now, this structure is widely used in Shouguang, the birthplace of winter sunlight greenhouse in China.

2. Choose vegetable greenhouse film with good light transmission performance.

0. 10-0. 12mm PVC long-life non-dripping film is the most widely used in production, with good light transmittance and heat preservation performance. At the same time, the surface of the film is cleaned every week to maintain good light transmission performance. ? 3. Using straw bioreactor to heat up.

Dig a ditch with a width of 60- 1750px and a depth of 25-750px according to the size of the cultivation bed, fill in the straw, put in a special microbial inoculum of 8kg/667m2, cover the straw with about 500px of soil, and irrigate until the straw can be thoroughly poured. Straw can gradually decompose under the action of microorganisms, and release heat and carbon dioxide. This measure can increase the temperature of rhizosphere soil by about 2℃, improve the physical structure and ecological environment of soil, and enhance the stress resistance of plants. It is the best measure to increase temperature, improve quality and increase efficiency in vegetable production in solar greenhouse in winter.

4. Use reflective curtains to increase temperature and fill light.

Hanging a reflective curtain on the north side or near the back wall of the greenhouse cultivation bed to keep an included angle of 75-85 degrees with the ground can increase the illumination by about 5,000 lux, not only increase the ground temperature by 65,438 0-3℃, but also increase the room temperature by about 3℃.

5, the use of light source artificial fill light

If you fill the light manually, it is best to choose fluorescent lamp, high-pressure mercury lamp and arc xenon lamp as the light source. Three 40-watt fluorescent lamps are combined to irradiate, with a distance of 45 cm from the seedlings and a light intensity of 3000Lx-3500Lx, and a high-pressure mercury lamp of 100W is 80 cm from the seedlings and a light intensity of 800lx-10000lx; The light supplement time should be carried out after sunrise, generally 2-3 hours a day, and stop after the light intensity in the shed increases, and the light can be supplemented all day in rainy and snowy days.

6, dig cold ditch insulation

Dig a cold-proof ditch with a width of 1000 px and a depth of 50-2000 px in the back wall of 2500px greenhouse and the front greenhouse of 250px greenhouse. This ditch is full of weeds, sawdust, etc. And covered with plastic film to isolate indoor soil from heat dissipation to outdoor frozen layer, thus achieving the purpose of heat preservation.

7. Other technical measures

In addition, selecting vegetable varieties that are resistant to low temperature, weak light, stress and strong growth potential, applying more organic fertilizer, watering rationally, removing aged and dead leaves in time, covering with plastic film, covering with thick straw mats or quilts, scientifically uncovering straw mats or quilts, and cleaning up the snow and pollutants on the film in time are all very important technical measures for increasing temperature, preserving heat and supplementing light in winter solar greenhouse vegetable production.