**Abstract**

Mycorrhizal activity is affected by many factors, including biotic and abiotic factors, and these factors can affect the interaction between the plant and mycorrhizal. In short, these factors are as follows: First—abiotic factors include: 1. Soil fertility, 2. Heat, 3. The light, 4. pH, 5. Salinity. Secondly—biological factors. These factors may include some mycorrhizal effects on plant growth, as well as their effect on encouraging the absorption of nutrients, especially phosphorous and other nutrients, in addition to nonnutritive effects such as growth-stimulating effects, improving the water relationship and plant resistance to drought and plant resistance to salinity, and improving soil structure and biological control.

**Keywords:** mycorrhiza, mycorrhizal activity, abiotic factors, biological factors, fungi, arbuscular mycorrhizal (AM), active dissemination, passive dissemination
