Effect of long-term fertilizer application and crop rotation on the infestation of fields by weeds
2006
Mohammaddoust-e-Chamanadad, H.R. (Agricultural Univ. of Timiriazev, Moscow (Russia). Dept. of Agronomy and Experimental Methods) | Tulikov, A.M. (Agricultural Univ. of Timiriazev, Moscow (Russia). Dept. of Agronomy and Experimental Methods) | Baghestani, M.A. (Plant Pests and Diseases Research Inst., Tehran (Iran). Weed Research Dept.)
Weed competition comprises an important aspect of biological stress on crops. In recent years, concerns over the environmental effects, economic costs and long-term efficacy of conventional weed management systems have led a growing number of farmers and scientists to seek alternative systems that are less reliant on herbicides and more reliant on ecological approaches. The effects of management practices on crop growth and yields may or may not be mediated through crop-weed interaction. The research was conducted during 2004 and 2005 at the long-term experimental site of the Department of Agronomy and Experimental Methods, University of Timiriazev, Moscow to determine the effects of crop rotation and mineral fertilizers on crop grain yield and. weed density. Long-term experience includes continuous of culture - winter rye, potato, barley, clover, flax and fallow, initiated since and crop rotation, included above crops since 1912. The six treatments consisted of various combinations of fertilizer: N, P, K, NPK and the control with no fertilizer application as control under weedy and weed free conditions. Results indicated that weed density was reduced by 3 times in rotational cropping than sole cropping for both winter rye and barley. Weed dry matter was also reduced 13 and 4 times, respectively, in winter rye and barley in rotational cropping than sole cropping. Application of nitrogen and NPK fertilizers reduced weed density and dry weight, while in barley the reduction in weed density and dry weight was only occurred when NPK was applied. Crop yield was higher in rotational cropping than sole cropping.
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