Ultrasound as a green technique to enhance soil mineralization potential

Abstract

Ultrasound has been widely applied in waste water treatment, but rarely research in agricultural soil. The present study aims to investigate effect of applying ultrasound (37Hz/30 min) in order to enhance soil mineralization in a long-term rice paddy in central Viet Nam. The result showed that soil carbohydrate content in the range of 182-437 mg kg-1, and ultrasound treatment significantly enhanced soil carbohydrate (48%) as well as carbon mineralization (43%) compared to control treatment after 4 weeks of anaerobic incubation. However, inorganic nitrogen was in the range of 19-31 mg kg-1 soil, and there were no significant changes observed in the initial inorganic and mineralized nitrogen of control and treated samples. The research demonstrated application of ultrasound could be a promised environmental friendly method to improve organic matter mineralization in soil.