Warm shed refers to the solar greenhouse, (including heated type and unheated type) generally has winter, the shed film needs to be covered with grass or greenhouse insulation quilt. Cold shed refers to a plastic shed that is supported only by a skeleton. It is relatively simple, also called cold shed.
The construction structure is different: the cold shed is broadly understood as a greenhouse without heating equipment and insulation equipment, the cold shed is mostly semi-circular, and the upper enlarged shed film is generally used in spring and autumn, and it is not used when it is cold. The common cold shed is the spring and autumn greenhouse, also called the ground shed, this greenhouse has a simple structure, mainly composed of skeleton and film.
Warm shed generally with back wall, back wall is earthen wall or brick wall as the main with thermal insulation materials, mostly brick wall structure, strong and durable, one side high and one low, now some use skeleton instead of wall, outside put quilt to keep warm, can be used in all seasons, the most important is winter can be warm. There are insulation measures on the shed film, and the heating equipment in the greenhouse is generally a radiator similar to heating.
Different applicable areas: cold shed is suitable for rainy weather in the south, good moisturizing effect, poor heat preservation, low cost, basically covered by glass and film. Warm shed is mainly used in cold weather in the north, a greenhouse made of bricks, steel bars, etc., the insulation effect is better.
The installation location is different: warm sheds are used in cold areas, cold sheds are used in warm areas.
The greenhouse is very widely used and can be directly used to improve the planting wall of crops, seed seedling cultivation, horse, sheep, pig, cattle, chicken, duck breeding; Flower production and cultivation, winter photography, farmhouse development, tourism management, etc.
The first condition for plastic cold shed vegetable production is to have a hot shed for seedlings, blind large progress cold shed vegetable production is not possible, and then there needs to be a water source, and the land needs to be flat. When building a cold shed, it is necessary to bury the columns and tie the arches in advance when the soil is frozen, and at the same time to bury the anchor of the pressing film line, in a north-south direction, because it is necessary to prevent spring winds. Generally, there is no need to cover the straw and insulation quilt, only a layer of plastic film.
The planting of greenhouse vegetables is mainly for market demand for off-season vegetables, generally when vegetables enter the winter, the supply of the market will be greatly reduced, when the vegetables in the greenhouse are just on the market. The temperature in the vegetable greenhouse is just suitable for the growth of vegetables, in the cold winter by the temperature of the greenhouse of more than 20 degrees can grow, in order to make the temperature in the shed rise in the cold winter, people will cover the greenhouse with grass, quilt. But in the northeast is different, winter greenhouse vegetable planting in the northeast need to input costs are relatively large, because after the autumn harvest here, the weather has been cold, into the heating period. Snow often leads to the collapse of the greenhouse to cause the harvest, in the winter cold temperature can reach minus 30 degrees, covered with a layer of two layers of quilt, grass, can not withstand the cold, many greenhouse crops need to burn coal or firewood to increase the growth temperature of crops.