EFFECT OF Sorghum bicolor L. (MOENCH) RESIDUES

Al-Bedairy, N.R.; Alsaadawi, I.S.; K. Shati, R.

	EFFECT OF Sorghum bicolor L. (MOENCH) RESIDUES
IRAQ JOURNAL OF AGRICULTURE
Article 1, Volume 5, Issue 16, 2011, Pages 0-0
Authors
N.R. Al-Bedairy; I.S. Alsaadawi; R. K. Shati
Abstract
Enkath sorghum cultivar was cultivated in four densities (0, 66000, 133000, 266000 plant/ha). At the end of the season, 50- 60% from sorghum shoot was taken and the remain was plowed with soil by Rotavator to give four sorghum residues rates (0, 350, 530 and 760 g per m2). The residue potential was evaluated alone and in combination with 0, 50 and 100% of recommended doses of Treflan herbicide against broad bean and its weeds. Weed free treatment was included for comparison. Broad bean seeds were sowed Nov., 12, 2009 in plots arranged in split-plot design with RCBD and each treatment was replicated three times. Sorghum residues represent the main plots while herbicide doses were assigned as the sub-plots. Both sorghum residue and herbicide application showed significant effects on the density and dry biomass of weed. Combination of recommended doses of herbicides with sorghum residue at 760 g per m2 produced minimum above ground dry matter of weeds (271.2 g per m2), which was 61% less than recommended herbicide dose applied alone. Application of 50% dose of herbicide on plants growing in plots containing sorghum residue at 760 g per m2 resulted more reduction of weed number and dry matter than recommended herbicide dose applied alone. Meanwhile, integration of herbicide and sorghum residue appeared to be superior in enhancing number of pod per m2 and yield per unit area of broad bean compared with herbicide alone. Also, application of 50% doses of herbicide with 530 or 760 g per m2 sorghum residues resulted non- significantly yield than recommended herbicide dose applied alone. Also, yield of seeds was increased when residue applied on weed free plots.

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