In this book, the authors review their own studies on the impact of arbuscular mycorrhizal fungi (rhizospheric microorganisms) on plant host physiology and development. The increasing interest for the reduction of the input of chemical fertilizers and the use of combined microorganisms as biofertilisers, particularly applied in organic agriculture, is taken into account. The authors also note that it is pertinent to complement the laboratory and greenhouse work with field conditions, possibly by working with agricultural farmers to achieve peak results. Following this, the putative role of sncRNAs on mycorrhiza-induced systemic stress tolerance is discussed, along with future prospects of sncRNA research in AM symbiosis and its potential practical applications. A final chapter focuses on the literature aiming for improvement of the biomass of date palm trees, and subjacent cultures, by setting up an efficient biological protocol integrating the arbuscular mycorrhizal fungi (AMF) and organic soil conditioners resulting from the composting of plants and agro-industrial waste.