EFFECT OF DELPHINIUM CONSOLIDA (L.) DENSITY ON WHEAT YIELD AND ITS COMPONENTS UNDER VARIOUS NITROGEN REGIMES

Field experiments were conducted during 2010–2011 to study competition between winter wheat and Delphinium consolida L. at five weed densities (0, 5, 15, 25, 35 plants m^-2) and three nitrogen levels of fertilizer (0, 200, 300 kg N ha^-1). The experimental design was a randomized block with four replicates. The parameters were recorded for wheat density, plant height, spike length, number of grains per spike^-1, grain weight spike^-1 and 1000 grain weight. The effect of wheat grain yield was established. The results showed that the competitive effect on wheat depends on the density of weeds. Significant differences between D. consolida L. densities were observed for most of the parameters. Wheat density, height of plant and grain yield decreased with the increase in weed density. The increase of nitrogen levels improved the competitive abilities of the wheat and effected the inter-specific competitive interactions. Differences in nitrogen levels at interactions with weed density were significant only for grain yield and spike length.