In areas scarce in water the possibilities of traditional technologies applied to economise on water resources and to provide crop yield are running short and now there is a sharp need in natural-biological technologies, of which one is the purposeful and large-scale application of mycorrhiza in cultivated lands and perennial plantations.The application of mycorrhizal fungi in symbiosis with plants on agrotechnological level may considerably reduce the negative effect of water deficit and unfavourable climatic conditions on the productivity of agrocenoses and ensure high yield.