Greenhouse Diffuse Glass – The Complementary Regulation of Light Transmittance, Haze, Accumulated Temperature, and Crops
The light transmittance, accumulated temperature, and haze of greenhouse anti-reflective glass are closely related to plant growth. They collectively influence the light environment within the greenhouse, thereby regulating photosynthesis, morphogenesis, and yield and quality of plants. Understanding the relationship between these four factors allows for a clearer understanding of the operating principles of greenhouses.
1. Light Transmittance and Plant Growth
Light transmittance is a key indicator of the ability of greenhouse covering materials to allow light to pass through, directly affecting the energy supply for plant photosynthesis. The light transmittance of glass greenhouses is typically between 91.5% and 97.5%. Too low a light transmittance leads to insufficient light, inhibiting plant growth; while too high a light transmittance (such as in summer) may cause excessively high temperatures, leading to excessive vegetative growth. Therefore, selecting high-transmittance, non-drip specialized greenhouse glass and regularly cleaning and maintaining it are fundamental to ensuring efficient light utilization.
2. The Regulatory Role of Accumulated Temperature
Accumulated temperature (effective accumulated temperature) is the total heat required for plant growth and development, directly related to light intensity and temperature within the greenhouse. High-transmittance glass effectively raises the indoor temperature in winter, meeting the crop’s accumulated temperature requirements; however, in summer, shading (such as shade nets and water spraying) is necessary to prevent excessively high accumulated temperature, which can negatively impact flower bud differentiation and fruit quality.
3. The Light Quality Regulation Function of Haze
Haze is a parameter describing the degree of light scattering. By changing direct light to diffused light, it improves the uniformity of light within the greenhouse. High-haze glass reduces localized shading, allowing light to cover plant leaves more evenly, which is particularly suitable for light-sensitive crops (such as some flowers and seedlings). In areas with extreme weather, haze can also suppress excessive hemispherical transmittance, preventing photoinhibition.
4. Synergistic Relationship Among the Three
Balance of Light Transmittance and Haze: High light transmittance ensures sufficient light quantity, while haze optimizes light quality. Both need to be adjusted according to crop requirements (e.g., leafy vegetables require high light intensity, while flowering and fruiting crops require uniform light) and the season.
Dynamic Management of Accumulated Temperature:By combining light transmittance and haze with supplemental lighting or shading techniques, accumulated temperature can be precisely controlled to meet the needs of different growth stages.
Crop Adaptability: For example, grape cultivation requires adjusting light intensity through light transmittance and haze to prevent excessive vegetative growth or flower and fruit drop; while short-day plants require supplemental lighting or shading to control flowering time.
5. Practical Application Recommendations:
Site Selection and Materials: Prioritize well-lit, unobstructed sites and use high-transmittance, dust-proof, and anti-aging glass.
Haze Selection: Adjust flexibly according to crop type and local climate (e.g., choose high-haze glass in areas with strong sunlight).
Environmental monitoring: Regularly monitor light transmittance, haze, temperature, and humidity, and optimize the light environment by using supplemental lighting or shading equipment.
By comprehensively controlling light transmittance, haze, and accumulated temperature, a suitable light and heat environment for plant growth can be created, improving greenhouse production efficiency.
The diffuse glass and AR-coated diffuse glass produced by Yuhua have cooperated with many large commercial greenhouses in agriculture, horticulture, nurseries and experiments. We have cooperated with large greenhouse project companies such as Havecon, Van Der Hoeven, Kubo, etc. for many years. Yuhua greenhouse glass has a light transmittance of up to 99%, and haze 5/10/20/30/50/70/75 greenhouse diffuse glass is available!
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