Sunlight boosts photosynthesis in vegetables, ensuring their yield and quality. But how do vegetables in greenhouses achieve sufficient lighting?

When planting different types of vegetables in plastic greenhouses, adhere to the principle of "higher in the north and lower in the south" to ensure the plants are orderly arranged in varying heights, minimizing shading from one another. Aim for uniform seedling sizes when transplanting the same vegetable variety to promote uniform growth and reduce shading between plants. Additionally, it is preferable to create beds from north to south for planting, allowing the plants to receive as much sunlight as possible.

Maintaining the cleanliness of greenhouse films is crucial, as water droplets, dust, and other debris can reduce light transmission by approximately 30%. After 2, 10, and 15 days of use, the light inside the greenhouse will decrease by 14%, 25%, and 28% respectively in new films. Therefore, it is essential to regularly sweep, rinse away dust, dirt, and water droplets from the film surface to maintain its cleanliness and enhance light transmission. During snowy days, snow should be promptly cleared as well.

In the production formula, our choice of anti-drip film incorporates several surfactants, significantly reducing the affinity between water molecules and the film surface. This allows water droplets to easily slip off the film, maintaining a water-free surface. Using the anti-drip film for greenhouse construction can enhance the light intensity within the greenhouse.

By controlling the timing of lifting the canopy, while ensuring adequate insulation, it is advisable to slightly lift the straw canopy earlier and delay covering it, which can extend the duration of sunlight and increase the amount of light penetration. Typically, lift the canopy 0.5 to 1 hour after the sun rises and cover it 30 minutes before sunset. Even during intermittent rainy days with periods of sunshine, it is still appropriate to lift the canopy to make the most of the scattered sunlight and compensate for the lack of direct sunlight.

Five, installing a reflective screen: Set up a 2-meter wide and 3-meter long aluminum-coated reflective screen, hanging it vertically against the north wall of the greenhouse. This can increase the ground light by about 40% and raise the greenhouse temperature by 3 to 4 degrees Celsius. Additionally, laying a silver-gray ground film on the ground can also enhance the light intensity between plants.

Six: Properly manage plant arrangement and promptly perform tasks such as topping, pruning, and removing old leaves, which is beneficial for improving the ventilation and light penetration conditions within the greenhouse, thereby enhancing light intake.

Different seasons feature varying durations and intensities of sunlight, necessitating measures tailored to specific circumstances.

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