(#)Ultrasonic irradiation time.(*)The Negative peak value of acoustic pressure measured by hydrophone in water.($)The time from injecting microbubbles into vessels to ultrasonic irradiation.
Through the application ratio of nitrogen (N), phosphorus (P) and potassium (K) in the field, L9 (33) orthogonal experimental design was used to study the effects of different N, P and K ratios on the
