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The control of weeds in corn fields by 2,4-dichlorophenoxy acetic acid



The control of weeds in corn fields by 2,4-dichlorophenoxy acetic acid



Dokl Vses Akad Sel Skokhoz Nauk Im V I Lenina : 7-8, 11



Research was done, by the All-Union Institute of Fertilizers and Soil Science, to determine the cause of the increased toxicity of the 2,4-D sodium salt when NH4NO3 (6-8 kg) and superphosphate (15kg/ha) were added. The toxic ity of the weed killer was found to be due to changes in the ac idity of the solution; toxicity increased as the pH of the solution decreased. As the pH of the solution decreased, the concentration of H ions and the amount of free 2,4 D increased. Therefore in acid environment, the toxic ity effect of the sodium salt of 2,4-D was intensified. Free 2,4-D penetrated more readily into the plant tissues and was more toxic than its sodium salt. It was not proved that the increase in toxic ity of the weedkiller (which occurred when mineral fertilizers were added) was connected with decrease in surface tension.

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