ROOTS AND SHOOT COMPETITION BETWEEN WHEAT Triticum aestivum L. AND OAT Avena fatua

Abstract

This study have been carried out during agricultural winter season 20102011 in Grdarasha fields to investigate shoot and root interference, and competition between soft wheat Triticum aestivum and wild oat Avenal fatwa in (pots) with three plant densities for four competition cases. In the experiment these traits for wheat and wild oats decreased significantly by plant densities (plant height, tiller/plant, spike or inflorescence /plant, shoot dry weight, grain weight, root dry weight, plant dry weight), also it was affected by the types of competition except of (plant height and tiller/plant). The studied traits were affected more by full competition with compare to other competition cases. Relative yield total (RYT) values was less than 1.0 for all plant densities and competition cases obviously decreased in full and root competition for the same density with compare to other competition cases. wild oats was more aggressive (A) than wheat in all densities except at full competition third density was 0.02 which values were between 0.02 and -2.28, also it was dominant in Competition Ratio (CR), the values were between 0.35-1.95. The Results of plant density and competition relationship indicated that decrease of shoot and root dry weight for both wheat and wild oats with increasing density, and it was affected more by full competition. Finally, concluded from this study, that oat was the most competitive than wheat, and the root system competitive was stronger than shoot system.