Six ways to improve the lighting rate of polyytunnel greenhouse construction
1.Reasonable layout
When planting different kinds of vegetables in the polytunnel greenhouse, the principle of "high in the north and low in the south" should be followed, so that the height and height of the plants are scattered and orderly, and the phenomenon of mutual occlusion should be minimized. The same kind of vegetable transplanting, and strive to the same size of seedlings, so that the plants grow neatly, reduce the shading between the plants. At the same time, it is better to do north-south planting, so that crops can receive sunlight as much as possible.
2. Keep the shed film clean
Water droplets, dust and other debris on the shed film will reduce the light transmittance by about 30%. After the new film is used for 2 days, 10 days and 15 days, the light in the polytunnel greenhouse will be reduced by 14%, 25% and 28% in turn. Therefore, it is necessary to clean frequently, wash the dust, dirt and water droplets on the surface of the shed, and keep the film surface clean to increase the transparency of the shed film. Snow should also be swept away in time
3.The selection of drip-free film
Several active agents are added to the formula of the production of the film, so that the affinity between the water molecules and the film is greatly weakened, and the water droplets flow into the ground along the film surface without water droplets. The selection of drip free film buckle can increase the light intensity in the polytunnel greenhouse and improve the temperature of the polytunnel greenhouse.
4.Reasonable cover the grass curtain
Under the premise of doing a good job of heat preservation, appropriately remove the straw curtain and delay curtain for heat preservation in advance, which can extend the lighting time and increase the amount of lighting. Generally, 0.5-1 hours after the sun comes out, the curtain is covered half an hour before the sun goes down. Especially in the rainy days when the rain stops, it is also necessary to properly uncover the curtain to make full use of the scattered light of the sun.
5. Set up reflective screens
With 2 meters wide, 3 meters long aluminized film reflective curtain, hung on the north side of the polytunnel greenhouse to make it vertical ground, can make the ground increased by about 40%, the temperature of the shed increased by 3-4℃. In addition, laying silver grey mulch on the ground can also increase the light intensity between the plants.
6.Do a good job of plant finishing
Timely field management, such as pruning, pruning, tying and beating old leaves, is conducive to the ventilation and light transmittance conditions in the polytunnel greenhouse.
