The greenhouse lighting should pay attention to

Winter greenhouse vegetable cultivation, how to improve lighting efficiency, a direct impact on high-yield bumper crops, Associate Professor Guo Zhiqing of the College of Horticulture, Northwest Agriculture and Forestry University, introduced to improve vegetable greenhouse lighting efficiency to start from the following aspects.

Planting and arranging the planting of vegetables in a shed should ensure that the plants are arranged in an orderly manner, and the mutual obstruction phenomenon is minimized. For the same kind of vegetables, the size of the seedlings should be ensured as much as possible to reduce shading among the plants. It is best to plant pods in the north and south so that they can receive as much sunlight as possible.

Selecting the drip-free membrane The drip-free membrane incorporates several surfactants during the production process, so that the affinity between the water molecules and the membrane is greatly weakened, and the water droplets flow along the membrane surface into the ground without generating water droplets. The use of a drip-free membrane shed can increase the light intensity in the shed and increase the temperature of the shed.

Ensure that the shed film is clean After the new shed film is used for 10 days and 15 days, the light in the shed will be reduced by about 25% and 28%. On the shed film, water droplets, dust and Other debris will reduce the light transmittance by about 30%. Therefore, it is necessary to frequently clean and wash the roof to increase transparency.

When the science uncovers the weather, it is possible to extend the lighting time and increase the amount of lighting when the insulation work is done properly and the straw curtains and the delay curtains are removed earlier. After the sun came out, it took about 0.5 to 1 hour to uncover the curtain, and the curtain was covered half an hour before the sun set. In the rainy days when it rains, it is necessary to properly uncover the sun's scattered light.

In the case of insufficient illumination of the reflective wall, an aluminum-plated film reflective screen 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, so that the ground can be brightened by about 40%, and the temperature of the canopy can be increased by 3°C~4. °C. In addition, laying silver-gray film on the ground can also increase the light intensity between plants.

Timely pruning Timely and scientifically pruning branches, squatting, arranging vines, playing old leaves and other field management are conducive to ventilation and light transmission in sheds.

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