How to increase the light and raise the greenhouse temperature on cloudy or rainy days this year?

1 reasonably uncover the grass cover to increase the light.

The light is weakened in winter, especially in rainy and snowy days for a long time. Vegetables not only can't carry out vigorous photosynthesis, but also reduce transpiration. Plants grow slender and easy to grow, and their disease resistance is reduced. Effective measures must be taken to improve the lighting conditions in the shed. Under the premise of good heat preservation, properly uncovering the straw cover in advance and delaying the straw cover can prolong the illumination time and increase the light input. Generally, the curtain is opened at 0.5- 1 hour after sunrise and covered with grass half an hour before sunset. Even on cloudy days, as long as the temperature is not low, we should properly uncover the grass and make full use of scattered light. Don't uncover all the straw mats in cold rain, snow or even cloudy days for a long time, lest the leaves lose water and wilt because of "flash seedlings". You should uncover a straw mat every other or every other, and the uncovered area will gradually increase. After two days, all straw mats will be uncovered.

2. Set reflective curtains and fill the light manually.

Hanging a reflective curtain of aluminum-plated film with a width of 2m and a length of 3m on the north side of the greenhouse to make it perpendicular to the ground can brighten the ground by about 40% and raise the temperature of the greenhouse by 3-4℃. In addition, laying silver-gray plastic film on the ground can also increase the light intensity between plants.

3 keep the shed film clean and increase transparency.

Water drops, dust and other debris on the shed film will reduce the light transmittance by about 30%. Therefore, it is necessary to clean the dust, dirt and water droplets on the shed surface frequently and keep the film surface clean to increase the transparency of the shed film. Try to use drip-free film to fasten the shed, which has good light transmission effect and improves the shed temperature.