The high rate of population growth on the one hand and the decrease in the area of fertile land due to the increasing development of cities and industrial areas on the other hand, increase the necessity of optimal use of existing facilities. In general, increasing the production of agricultural products is possible in two ways, one is through increasing the cultivated area and the other is increasing the crop yield per unit area. The first method is not applicable due to the above-mentioned reason, therefore, it is necessary to increase the amount of production per surface unit by using new technologies. The production of greenhouse seedlings is one of the examples of more production at a lower level. The implementation of this project as a production activity, while being considered a step towards the country's self-reliance in agricultural products, can provide the needs of transformation industries and the consumer market, and create a platform for the employment of specialized forces, especially in agricultural sciences and those without expertise.

Definition of greenhouse:

Green house refers to a limited space that has the ability to control suitable environmental conditions for the growth of plants from different areas during different seasons of a year. According to this definition, among the functions of the greenhouse is providing the necessary and required environmental conditions for a certain product.

Greenhouses are divided into fixed and mobile depending on the type of construction materials used in them. Fixed greenhouses are greenhouses whose construction materials are stable and durable. So you have to use them for years.

Greenhouse construction site

The location of the greenhouse construction is one of the first decisions that must be made, is that the greenhouse will be built as a separate unit, in contact with existing buildings or as a part of new buildings.

Connected greenhouses usually have lower construction and heating costs and are easier to access, but the plants receive less light. Connected greenhouses should be built facing south.

An independent greenhouse can be built in a place far away from the existing buildings. Plants in such a greenhouse receive sunlight from all directions. These greenhouses are very expensive in terms of construction and heating system, and they require extraordinary expenses for water and electricity lines.

A greenhouse can be made in any size, but the smallest greenhouse that can be considered is something around 200 square feet (18.4 square meters). Smaller greenhouses are relatively expensive in terms of construction and performance.

The issues that should be considered for the construction of a greenhouse are:

* Access to transportation ways, which is minimized by building as close as possible to the main roads.

* Type of fuel used in the greenhouse; In areas where there is access to natural gas, the use of this cheap fuel can greatly reduce production costs in the cold season.

* Access to water sources with the right quality and quantity

* environmental effects; A place that constantly has unfavorable weather, heavy rains, shade caused by being located on the northern slopes of high mountains or towering trees, is not suitable for building a greenhouse. Light intensity is one of the determining factors

* The type of product included in the production plan; Considering that the trends are towards the exclusive production of products and the production agenda is determined after the initial study of the domestic and foreign markets. Before construction, they must first determine what product to produce, then decide to build a greenhouse in the region and climate suitable for that product.

* Keeping in mind the laws related to the land of urban areas and the construction and operation of greenhouses, etc.

* The construction site should be as flat as possible, because if it is uneven and steep, creating a large greenhouse will be associated with many problems and costs for leveling.