[Use of ultrasound in the quantitative estimation of soil and rhizospheric microorganisms].

Ultrasonic treatment of soil, though being very effective for desorption of cells and deaggregation of microcolonies, may damage and kill microorganisms. Possible application and effectiveness of ultrasonic treatment was studied in this work with chernozem (dry and wet samples), rhizosphere and rhizoplane of pea. An ultrasonic disintegrator of low frequency is recommended for dry soils. Ultrasound cannot be recommended for treating rhizosphere and rhizoplane of plants without checking its effectiveness in each case.