Microbiological Characteristics of Different Types of Irrigated Soils in the Subtropical Zone of Azerbaijan

The results of a long-term study of the dynamics of taxonomic groups of microorganisms in irrigated soils of the subtropical zone of Azerbaijan under rotation with vegetable and forage crops and under continuous growing of these crops are discussed. It is shown that the maximum population density of the microorganisms consuming organic nitrogen is typical of the alluvial meadow-forest and yellow ferralitic gley soils. The population density of microorganisms is lower and the mineralization coefficient is higher in the soils under continuous crops as compared with the analogous soils under the crop rotation system.