In article results of laboratory researches on studying of influence of frequency of an ultrasonic atomizer on changing of phytotoxicity of not selective system herbicide on the basis of N-(phosphonomethyl)-glycine (glyphosate) are presented. Joint application of herbicide, organic acids in midget concentration and ultrasonic atomization with frequency 22 kHz has led to inhibition of all live plants at lower concentration of herbicide in a solution and has allowed to lower norm of entering of herbicide on 40 %. Applying of ultrasonic atomization with frequency of 2.5 MHz has led to hydrolysis N-(phosphonomethyl)-glycine and decrease in its phytotoxicity.
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