Can the crops in the greenhouse absorb enough sunlight?

When vegetables are planted in greenhouses in winter, the light quality directly affects the yield and harvest. Vegetables can grow normally with sufficient light. In case of continuous rainy weather, or snow and ice weather, the light is too weak, which will affect the quality and yield of vegetables. So, how to improve the illumination rate of greenhouse vegetables? According to relevant agricultural technical experts, improving the lighting efficiency of vegetable greenhouses can start from the following aspects.

It is a daily thing to lift quilts in greenhouses in winter, and the time for each farmer to lift quilts is different. In order to ensure the temperature in the shed, some people open the quilt after the sun rises, usually until eight or nine in the morning, so that the temperature in the shed will not decrease and the lighting time will be reduced. In order to ensure that plants get a certain amount of sunlight, the quilt should be opened early. In the case of insufficient light, aluminum-coated reflective curtain with a width of 2 meters and a length of 3 meters can be hung on the north side of the greenhouse to make it perpendicular to the ground, which can make the ground illumination reach about 40% and increase the temperature in the greenhouse by 3℃~4℃.

In the morning, the sun shines directly into the greenhouse. After uncovering the quilt, plants can absorb light and increase the time of sunlight exposure. Some farmers said that how to choose between temperature and light, short-term low temperature has little effect on plant growth, relatively speaking, it is difficult to make up the light, and covering the quilt early is also a simple way to add light. Generally speaking, there is no light around five o'clock. At this time, you should turn on the fill light and turn off the light at eleven o'clock. The specific light supplement time should be determined according to the growth needs of crops.

Hanging a fill light lamp is also a way to increase illumination, and two problems should be paid attention to when using the fill light lamp. First, when choosing fill light, the larger the lighting area, the better. Considering the uneven illumination of crops, the illumination intensity and distance of plants under supplementary illumination should not be too different. The time to fill the light should be well grasped. This doesn't mean that you have to keep the light on all the time. According to the growth law of plants, plants are not always growing, so they should have a rest at night. As I said just now, the quilt falls early in winter.