**4. Design of AMF bio-fertilizer production unit**

The aim of our present study is to set up a production unit for AMF biofertilizers, which has the advantage of covering the biological deficit of arid soils, a problem which continues to degenerate more and more. Indeed, the installation of a bio-fertilizer unit must follow some criteria such as: appropriate production, location, construction space, equipment, machinery, other laboratory equipment and working capital. The bio-fertilizer production unit should be founded in a homogeneous area based on the interaction of soil characteristics, geomorphology and climate. This place should be qualified as a buffer to reduce the risk of contamination during the process of production and quality control. The overall architecture of the unit is the key element for the success of any economic project. In our case,

the bio-fertilizer production unit must be organized in an H-shaped architecture (**Figure 2**). This comes, according to Alamari [4], This author explained that this structure is based on the fact of its economical aspect and its ability to adapt to the sterilization process with forward walking, in other words from the "soiled", to go towards the "clean" and then towards the "sterile", without possibility of going back and without crossing of flows of "soiled" and "clean". The unit must contain administration, laboratories, storage and packing space.
