ALLELOPATHIC EFFECT OF RESIDUES OF TWO                          ( Sorghum bicolor L .(MOENCH CULTIVARS ON GROWTH AND YIELD OF MUNG BEAN AND COMPANION WEEDS

A. Al-Khateeb, T.; S. Al-Saadawi, I.; A. Hadwan, H.

	ALLELOPATHIC EFFECT OF RESIDUES OF TWO ( Sorghum bicolor L .(MOENCH CULTIVARS ON GROWTH AND YIELD OF MUNG BEAN AND COMPANION WEEDS
IRAQ JOURNAL OF AGRICULTURE
Article 1, Volume 18, Issue 1, 2013, Pages 0-0
Authors
T. A. Al-Khateeb; I. S. Al-Saadawi; H. A. Hadwan
Abstract
Field trial was conducted in the field of Department of Biology, College of Science, Baghdad University to test the allelopathic effect of residues of two sorghum cultivars (Enkath and Rabeh) on weeds of mung bean crop. Residues of sorghum cultivars at zero (control), 500 and 1000 g m -2 were incorporated into the soil. Weed free plots with and without the cultivars residues were also included in study for comparison. The experiment was conducted in a Randomized Complete Block Design with 3 replications and the mean were compared using LSD at 0.05% level. Results indicated that weed density was reduced by 36 and 44% of control by incorporation of Entkath residue at rates of 500 and 1000 g per m2 at 30 days after sowing (DAS), respectively. While the reductions were 22 and 25% of control by incorporation of aforementioned residue rates of Rabeh cultivar. The reduction in weed density remained higher by Enkath than by Rabeh residues at 60 DAS. Aboveground biomass of weeds was also reduced significantly by incorporation of residues of both sorghum cultivars and the reduction increased with the increased residue rate; however, Enkath was the most weed biomass suppressing cultivar compared to Rabeh cultivar. Incorporation of sorghum residues significantly increased yield and number of pods and seeds per plant over control. Maximum yield was obtained in weed free plots received Enkath residue at 500 and 1000 g per m2 residues followed by weed free plots amended with Rabeh residue at the aforementioned rates. Chemical analyses indicated that total phenolics were found to be higher in Enkath plants than in Rabeh plants suggesting the superiority of allelopathic potential of Enkath cultivar over Rabeh cultivar against weeds. The possible role of allelopathic sorghum residues in weed management in organic culture is briefly discussed.

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