APPLICATION OF ALLELOPATHIC POTENTIAL OF TWO CULTIVARS OF SUNFLOWER RESIDUES IN COMBINATION WITH LOWER RATE OF TRIFLURALIN HERBICIDE FOR WEED CONTROL IN MUNGBEAN

A. Tawfiq, A.; S. Alsaadawi, I.

	APPLICATION OF ALLELOPATHIC POTENTIAL OF TWO CULTIVARS OF SUNFLOWER RESIDUES IN COMBINATION WITH LOWER RATE OF TRIFLURALIN HERBICIDE FOR WEED CONTROL IN MUNGBEAN
IRAQ JOURNAL OF AGRICULTURE
Article 1, Volume 20, Issue 1, 2015, Pages 0-0
Authors
A. A. Tawfiq; I. S. Alsaadawi
Abstract
Field study was undertaken to explore the response of weeds and mungbean crop to soil incorporated with sunflower residues in combination with lower rate of a pre-plant herbicide (Trifluralin). Sunflower residues of two cultivars Shumoose and Sin Altheeb at 3.2 and 6.4 t ha-1 were used either alone or in combination with trifluralin at 1.2 L ha-1 (50% of label rate). Trifluralin at full label rate (2.4 L ha-1), weed control and weed free treatments were also included for comparison. Plots treated with 50% of label rate of herbicide and amended with sunflower residues of cultivar Sin Altheeb recorded least weed density and dry biomass and this suppression was much greater than the residue treatments alone and more than cultivar Shumoose. Application of herbicide at 50% rate in plots amended with Sin Altheeb residue resulted yield 64% more than with the label rate of herbicide treatment. Chromatographic analysis of sunflower amended field soil revealed the presence of several potent allelopathic compounds in the residues of both cultivars with greater quantity in Sin Altheeb than in Shumoose. Periodic data revealed that maximum quantities of these phytotoxins were coincided with the period in which maximum suppressive activity against weeds was noticed under field condition, which explain the activity of phytotoxins on weed suppression. The other advantages of this method in improving soil physical and chemical properties are briefly discussed.

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