As climate variability intensifies and demand for higher produce quality grows, protected cultivation in greenhouses and net-houses has become an increasingly attractive path for Vietnamese farms and agribusinesses. By creating a controlled growing environment, producers can actively manage the key factors affecting crops, reduce weather dependence and significantly limit pest pressure.
Greenhouses versus net-houses
Both structures shelter crops from the external environment, but they differ in material and degree of control. Net-houses use specialised polyethylene films and are lower in cost, well suited to tropical and sub-tropical conditions. Greenhouses use glass or polycarbonate, offering durability, stable light transmission and, usually, more sophisticated climate systems. The right choice depends on the target crop, available capital and local climate.
Environmental factors to control
The core strength of protected cultivation is the ability to adjust several growth parameters at once, keeping crops within their optimal comfort zone.
- Temperature: managed via ventilation, circulation fans, shade screens or evaporative cooling pads.
- Humidity: controlled through misting, airflow and drip irrigation to suppress fungal disease.
- Light: shade nets, diffusing films and, in advanced systems, supplemental LED lighting.
- CO2: can be enriched to boost photosynthesis in closed greenhouses.
- Water and nutrients: delivered precisely through automated irrigation and dosing.
Automation and sensing
The true value of modern protected structures lies in their automation layer. Sensors for temperature, humidity, light, EC and pH feed into a central controller that can trigger fans, screens, pumps or fertigation when thresholds are crossed. This reduces labour while generating continuous cultivation data that underpins process optimisation, early anomaly detection and traceability.
Suitable crops and the investment question
Not every crop justifies this higher-cost model. The best economic candidates are high-value, fast-turnover or weather-sensitive crops.
- Premium leafy greens and hydroponic vegetables.
- Tomatoes, melons, cucumbers and bell peppers.
- High-value flowers and ornamentals.
- Seedlings and nurseries needing stable conditions.
Upfront capital is higher than open-field farming, and the payback period depends on crop, price, yield and level of automation. A prudent financial plan that accounts for operating and maintenance costs is essential before deployment.
Environmental control is not about replacing nature, but about placing crops into an optimal growth zone that is stable and repeatable.
Risks to plan for
The model demands stronger technical and management capacity. Heat build-up during hot seasons, power failures and rapid pest outbreaks in enclosed spaces are risks that require contingency planning, trained operators and standard operating procedures. Structures must also be designed for local wind, rain and radiation conditions rather than copied from other climates.
Aligned with its mission to accompany farmers, cooperatives and enterprises in modernising production, ASTRI Institute treats protected cultivation as a key component of high-tech agriculture, focusing on applied research, technology transfer and training so that environmental-control models are deployed appropriately and remain economically sustainable in Vietnam.