The manual studies the mechanisms of adaptation and resistance of plants to adverse environmental factors in cryoarid conditions, including Transbaikalia. The protective and adaptive capabilities of plants against the damaging effects of low and high temperature, lack of humidity in the air and soil, winter drought, a wide range of temperature changes during the day, and t. are considered. d. and the ways of raising them to stressors . In the educational publication, after each section, control questions and test tasks for independent work of students are prepared . The textbook was prepared in accordance with the requirements of the federal state educational standard of higher education in the direction of 35. 03. 03. Agrochemistry and agro-soil science, qualification Bachelor .