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Tesfahunegn, Gebreyesus Brhane ,  Tamene, Lulseged ,  Vlek, Paul L.G. ,  Mekonnen, Kindu ,  [Assessing farmers` knowledge of weed species, crop type and soil management practices in relation to soil quality status in mai-negus catchment, northern Ethiopia] ,  Assessing farmers` knowledge of weed species, crop type and soil management practices in relation to soil quality status in mai-negus catchment, northern Ethiopia