WEED COMPETITION EFFECT ON WHEAT CULTIVARS AND ITS IMPACT ON GROWTH CHARACTERS
ANBAR JOURNAL OF AGRICULTURAL SCIENCES,
2010, Volume 8, Issue 4, Pages 444-456
AbstractA field experiment was conducted during 2008-2009 winter season at the Farm of Field Crop Sciences Department, College of Agriculture/ University of Baghdad, to identify effect of weed competition on growth characters of some wheat cultivars. Randomized Complete Block Design arranged in Split plot was used. The main plots included weed treatments, weedy check treatment, grass weed treatment, broadleaved weed treatment and weed free treatment, while sub plots included wheat cultivars, Tahaddi, Iraq, Fatah, Abu-Graib 3, IPA 95 and IPA 99. The results showed that the percentage of broadleaf weeds after 90 days from sowing was 94.5% of the total densities of weeds while the percentage of grass weeds was 5.5%. The cultivars of wheat differed in their response to weed competition, Abu-Graib 3 and Iraq cultivars had more ability to tolerance weed competition and their growth characters are not affected by weeds presence or absence. While growth characters of IPA95 and IPA99 cultivars were more sensitivity to weeds competition and the percentages of decreasing were 8.2 and 2.4% to plant height, 10.7 and 34.5% to number of tillers, 18.6 and 28.4% to biomass, 11.9 and 8.5% to harvest index respectively. It was concluded from the present study that Abu-Graib 3 and Iraq cultivars sowing at the weedy farms may be more tolerance to weeds competition while IPA95 and IPA99 cultivars sowing may be less tolerance to weed competition in comparison with other cultivars.
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