> 4. for the time being, it's a regulatory issue, just like water use (a single plant use 2-2.5 l/day)
Is the 'plant' there a, say, tree or is it referring to the whole building?
Is the 'plant' there a, say, tree or is it referring to the whole building?
water use is necessary to manage internal climate. the greenhouse was designed to keep heat inside. the plants have to cool themselves (hence the environment) by evaporation. the farmer manages evaporation rate by watering, temperature and humidity. there are many feedback loops, both negative and positive, balancing it is a non-trivial task.
btw. there's an average of 1.2-1.3 plant/m2 in most tomato greenhouses I've seen.