J. Bio. Env. Sci.13(1), 60-71, July 2018
Weeds are one of the major concerns in agricultural production and weed survey served as baseline information for a strategic weed management system. Four season weed surveys were conducted to assess the effect of different cropping pattern on the weed composition and abundance and identified using different weed reference materials and analyze using PAST software 3.16. The study shows that weed composition in terms of species diversity and abundance varies as affected by the season, crop planted, stage of crop and cropping pattern. Weed species richness and abundance were observed higher in wet season than in dry season and during vegetative stage than in reproductive stage of the crop as affected by crop’s canopy cover and available soil moisture. Highest diversity index based on Shannon (H’=2.603) and Simpson (D=0.912) diversity index was found on reproductive stage of rice-corn plot during the 2016 wet season. Also, 2015 and 2016 wet season cropping had a significant difference (p=0.0012) in terms of its weed composition due to the crop rotation scheme. Some weed species were able to adapt different environmental condition that resulted in the complexity of the weed community and their persistence in the field. Lastly, the study revealed that crop rotation does not significantly reduce weed composition but it lowers the weed species abundance and lessens the weed dominance of some noxious weeds found in the field.
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