The southern plants do not take root in the open ground because of lack of heat. The only exit – the closed soil which allows not only to develop but also to receive harvest before vegetations in the nature.
The closed soil represents greenhouses and greenhouses in which grow up thermophilic plants. In greenhouses – agricultural, in greenhouses – fruit, decorative types and flowers. The concept "the closed soil" is not quite correct as sometimes mean mineral solutions by soil. This way is called still hydroponics. There are several types of the closed soil – from greenhouses (hotbeds) on seasonal dachas to industrial greenhouses which are equipped with powerful lighting lamps, artificial heating.
Greenhouses
Kultivatsionny rooms subdivide into three types: cold, moderate and warm.
In cold greenhouses average temperature in the winter of +1 - 5 degrees, in them grow up plants which do not demand high temperature. For example, lemons, oranges, bitter oranges. They are intended for rewintering of such types which with approach of spring should not begin growth prematurely. Moderate maintain temperature of 8-12 degrees, in them grow up subtropical plants. 16-18 degrees in the winter in warm greenhouses, they are intended for tropical plants. High temperature keeps thanks to low walls.
Greenhouses
Greenhouses separate into three main types: wall, traditional and polygonal. Other types - only their version. They differ in transparency, the price and convenience in operation. The wall greenhouse has number of advantages. Saves the place, unlike separate design, and energy. In case of need it is possible to turn it into winter garden or greenhouse for flowers. The traditional greenhouse represents construction which is arranged so that to consume the maximum quantity of solar color, irrespective of weather patterns and season. This look differs in the wide range of designs and the sizes at the low price. This design it is necessary to have from the East on the West that all its corners were lit, and not just those which are closer to the sun. The polygonal greenhouse represent design of octahedral form. It is the most practical, decorates the seasonal dacha and the most expensive is. Make it of timber, polymeric and metal frame constructions, they are film, glass and from egg plastic. The strongest material, of course, polycarbonate, but also the most expensive. Despite all merits and demerits, gardeners prefer film greenhouses. They serve not one year and the price as corresponding. Though the film should be removed and pulled (in the fall and in the spring), besides rather incorrect movement that to damage it. Therefore it is more reasonable to get the greenhouse from polycarbonate. The term of its service wholly will justify the price.