A nation that can't control its energy sources can't control its future. Barack Obama
  • In recent years, the accepted norm for growers of edible crops such as tomatoes, cucumbers and peppers has been to control humidity based on humidity deficit (HD). This is because conventional wisdom suggests that maintaining a minimum HD promotes transpiration, which, in turn, ensures optimised plant development and growth.
  • What are the energy implications of using ‘pre-night’ or ‘drop’? ‘Pre-night’ is a technique used by some edible crop growers who believe that a rapid drop in greenhouse temperature just before sunset helps crop development.
  • In our article 'Where should you position your measuring box?', we showed how relying on a measuring box placed in the traditional position at the top of a tomato crop can give non-optimised control of the greenhouse environment and lead to wasted energy.
  • Controlling humidity can be expensive in energy terms, yet it is essential for the control of fungal disease and to ensure active plant growth. Humidity control also needs to be carefully targeted so as not to negate the energy savings from measures such as temperature integration (TI) and thermal screens.