Effects of herbicides on crop yields

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Otika Richard
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Effects of herbicides on crop yields
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I want to use a non selective herbicide to kill the grasses and other weeds before ox-ploughing and planting in the field. Is there any bad effect of the chemical on the soil that later results into poor yields? How long, after using the chemical, can I plant my seeds? (Onen Simon, 31yrs, Gulu District, Northern Uganda)