An Assessment of the Impact of Glyphosate and 2,4-D Amine Salt on Weeds in Niger

An experiment was carried out to investigate the efficacy of two herbicides, viz., glyphosate and 2,4D amine salt at varying doses for the control of the main noxious weeds. The lowest application rate (0.5l per ha of 2,4-D and 2l per ha of glyphosate) of both herbicides gave a control of shoot grow th and drastically reduced the green biomass compared to unweeded plots at different time intervals after the application. There was no re-growth up to nine days after spraying in all treated plots. The highest control of the density of noxious weeds has been obtained with 2,4-D amine salt at the dose of 1.5 l per ha and glyphosate at the dose of 4l per ha in six days after treatment; the reduction rate was more than 85%. Data on green biomass also showed drastic reduction following herbicide application.