Summer is a critical period for greenhouse crop growth, but it is also a "high-loss season" characterized by frequent extreme weather. However, many growers still rely on traditional, extensive management practices, leading to frequent issues such as heat-induced seedling damage, disease outbreaks, and facility aging. Scientifically understanding and avoiding these summer maintenance pitfalls is essential for ensuring stable, high-quality yields and extending the lifespan of the facilities.

The primary mistake in managing glass greenhouses in summer is blind ventilation. Some growers leave the vents fully open day and night, ignoring that hot winds at midday can easily scorch crop roots. Furthermore, leaving the greenhouse open at night disrupts the day-night temperature balance, causing excessive vegetative growth (leggy plants) and flower or fruit drop. Scientific ventilation should be adjusted flexibly based on the weather; during rainy periods, timing is crucial to prevent rain from entering the greenhouse or exposing crops to intense light and heat immediately after a storm.

Secondly, high-temperature flood irrigation and improper watering schedules are the main culprits behind root diseases. Watering at noon causes a drastic temperature difference between the water and the soil, leading to "root shock." Meanwhile, flood irrigation creates excessive humidity inside the greenhouse, triggering infectious diseases like downy mildew and powdery mildew. Summer watering should follow the principle of "frequent, small amounts," ideally done before 10:00 AM. Using straw mulch on the walkways can also help lower soil temperature and reduce water evaporation.

Thirdly, excessive shading and neglecting facility maintenance can be equally fatal. Keeping shade nets on all day leads to insufficient light, reducing photosynthetic efficiency and causing weak stems, leggy growth, and lower yields. Shade nets should be kept 0.5 to 1 meter away from the plastic film to create an air gap that accelerates heat dissipation. Additionally, prolonged sun exposure and rain can cause the plastic film to age and the steel framework to rust. Without regular maintenance, equipment like exhaust fans is highly prone to sudden breakdowns during the hot season.

Finally, delayed drainage and dehumidification after rain create a breeding ground for diseases. Following summer rainstorms, accumulated water and high humidity easily lead to root rot and the spread of soil-borne diseases. Post-disaster response must include quickly clearing ditches, propping up fallen plants, and cultivating the soil to improve aeration. Applying foliar fertilizers can also help the crops recover their vitality.

Ultimately, the refined management of greenhouses in summer directly determines the year's planting profits. Growers must abandon the outdated notion of "only caring for the crops, not the greenhouse." By integrating environmental control, water and fertilizer management, and facility maintenance, and by employing scientific ventilation, reasonable watering, moderate shading, and timely post-disaster rescue, growers can build a standardized summer maintenance system. This is the key to effectively mitigating the risks of extreme weather and achieving stable, high-yield greenhouse agriculture.