The core benefit of using shade nets in greenhouses is to regulate the light and temperature inside the shed, while protecting crops from adverse environmental impacts. Specifically, it can be divided into the following points:
1. Cooling and sun protection: Block part of the intense sunlight to avoid crop leaf scorching and water shortage caused by excessive transpiration. It can usually reduce the temperature inside the shed by 3–8℃.
2. Light regulation: Control the light intensity according to crop requirements (such as shade-loving crops and crops in the seedling stage), prevent excessive light from inhibiting photosynthesis, and improve crop quality.
3. Wind, rain and pest prevention: Alleviate the impact of heavy rain, reduce soil compaction and crop lodging; block some moth pests from directly entering the shed, and lower the probability of pest infestations.
4. Water and soil moisture conservation: Reduce water evaporation inside the shed, maintain stable soil moisture, decrease irrigation frequency, and save water resources.
5. Prolonging the growing period: Create a suitable micro-environment for crop growth in high-temperature summers or strong light conditions, avoid growth stagnation caused by high-temperature stress, and extend the harvest period.