Wild oat (Avena fatua L.) in competition with wheat (Triticum aestivum L.) for nitrogen
1995
Cheema, M.S. | Nazir, M.S. (University of Agriculture, Faisalabad (Pakistan). Dept. of Agronomy)
An experiment was conducted to determine the effect of different nitrogen levels on competitive behavior of wild oat (Avena fatua L.) densities and its impact on wheat yield. Different wild oat densities showed highly negative correlation between grain yield and yield components such as fertile tillers, number of grains per spike and 1000-grain weight while wild oat biomass showed highly positive correlation. Wheat yield reduction by wild oat densities was more pronounced in unfertilized plots, whereas the magnitude of yield loss was reduced with successive increase in nitrogen rates. Maximum nitrogen uptake in both wheat and wild oat was recorded at 150 kg N ha-1 indicating that wheat crop was equally competitive up to the highest nitrogen rate. Increasing the wild oat density from 10 to 50 plants m-2 gave progressive decrease in nitrogen uptake by wheat while reverse was true in case of wild oat. A weed density of 22 wild oat plants m-2 was the economic threshold density for nitrogen (RW = 0.099) with 100 N kg ha-1 and wheat density of 200 plants m.
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