TYPES OF FALLOWS IN THE STEPPE REGION OF SOUTH URALS AND THEIR ECONOMIC AND BIOLOGICAL EVALUATION
The fallow lands of the steppe zone of the South Urals have been studied. The classification of fallow lands types, taking into account the predecessors and soil differences has been elaborated. The productivity and economic value of the vegetative mass of different types of fallows in the southern dry steppe zone of the Orenburg region have been estimated by the criteria used in geobotany. Analysis of the results of the studies conducted showed that the most productive and valuable, from the economic point of view, types of land were wheat grass fallows. The fallows with perennial grasses are being economically the most beneficial ones for the regional farms because starting from the first years when the arable land is transformed into fallow land it is capable of producing high-grade animal fodder in great volumes. These fallows are practically unfit for the long lasting sod process, the stage of sagebrush-tall weed growing, the amount and percent of participation of inedible, harmful and toxic vegetation groups in the grass stand is dramatically reduced.