2026-06-25
Tunnel Greenhouse Pain Points Solved: From Yellowing Leaves to Wind & Snow Resistance – A Systematic Guide
Pain Point #1: Poor Ventilation → High Temperature & Humidity Cause Diseases
Symptoms
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Summer temperatures inside can exceed 50°C, far above the suitable range for crops.
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Excessive humidity leads to frequent outbreaks of gray mold, powdery mildew, and late blight.
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Leggy growth, severe flower and fruit drop.
Systematic Solutions
| Measure | Specific Action | Effect |
| Dual-side roll-up ventilation | Install manual or electric roll-up units on both sides for large-area opening | Ventilation area can reach 80% of sidewall area |
| End-wall doors + insect mesh | Install sliding doors at both ends with 40-60 mesh insect screen | Creates cross-flow ventilation while blocking pests |
| Roof vent (advanced) | Add butterfly or continuous roof vent mechanisms at the top | Hot air rises and exits naturally for best cooling |
| Shade net | Apply 30%-50% shade net externally in summer | Reduces light intensity by 20%-40% and lowers temperature |
Zheyang Recommendation: For tunnels longer than 30 meters, add an extra set of sidewall vents every 15-20 meters to prevent "dead air zones" in the middle section.
Pain Point #2: Poor Winter Insulation → Freeze Damage, Growth Stagnation
Symptoms
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Nighttime temperature inside is only 3-5°C warmer than outside.
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Below 0°C, fruit vegetables (tomatoes, cucumbers, peppers) suffer irreversible freeze damage.
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Reluctance to ventilate for fear of heat loss leads to excessive humidity.
Systematic Solutions
| Measure | Specific Action | Effect |
| Double-layer film | Two film layers with a 10-20 cm air gap in between | Improves insulation performance by 40%-60% |
| Internal thermal curtain | Deploy non-woven or aluminum foil thermal curtain at night | Reduces radiant heat loss, raises temperature by 3-5°C |
| Plastic mulch | Cover planting beds with clear or black plastic film | Increases soil temperature by 2-4°C, reduces evaporation |
| Emergency heating | Use forced-air heaters or wood-burning hot air furnaces during extreme cold | Emergency frost protection for critical production periods |
