The protected greenhouse environment The greenhouse environment is designed to allow plants to perform close to their genetic optimum so that the grower achieves maximum profit. A greenhouse is designed so that the plant converts sunlight, water and CO2 and minerals into marketable yield. Thus the protected greenhouse environment creates a "cozy" climate inside a [...]

Ventilation of  greenhouses in humid tropical areas presents the grower with a complete new set of problems. There are various methods available but none have the desired effect. Screening is limited since it can only be applied during certain periods of the day and it limits the amount of sunlight reaching the plants. Evaporative pads [...]

Arid regions are characterized by low rainfall, low humidity and high temperatures during summer. The largest problem is temperature during the day time inside the tunnel during summer months. According to Arbel, Segal, et al. (1990), greenhouses found in arid areas have specific needs that should achieve the following: Low cost of construction and maintenance [...]

  Ventilation is the exchange of air inside the greenhouse with air taken from outside the greenhouse using either natural or forced methods. Ventilation efficiency is critical in successful crop growth. The most common problem encountered in hot arid climates is to cool a greenhouses down in comparison with Northern Europe where greenhouses need to be [...]