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- Title
Weed management in broad bean (Vicia faba L.) through allelopathic Sorghum bicolor (L.) Moench residues and reduced rate of a pre-plant herbicide.
- Authors
ALSAADAWI, I. S.; KHALIQ, A.; LAHMOD, N. R.; MATLOOB, A.
- Abstract
A two-year field study was undertaken to explore the response of weeds and broad bean crop to soil incorporated allelopathic sorghum residues in combination with lower rate of a pre-plant herbicide (trifluralin). Sorghum residues at 3.5, 5.3 and 7.6 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), weedy check and weed free treatments were also included for comparison. Plots treated with 50% of label rate of herbicide and amended with sorghum residues recorded least weed density and dry biomass and this suppression was much greater than the residue treatments alone. Application of herbicide at 50% rate in plots amended with sorghum residue resulted in similar yield as with the 100% herbicide rate treatment. Chromatographic analysis of sorghum amended field soil revealed the presence of several potent allelopathic compounds of phenolics in nature. 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. Integration of sorghum residues with a lower herbicide rate can furnish adequate weed suppression without compromising yield, which could be used as a feasible and environmentally sound weed management approach in broad bean fields.
- Subjects
WEED control; FAVA bean; ALLELOPATHIC agents; SORGHUM; HERBICIDES; TRIFLURALIN
- Publication
Allelopathy Journal, 2013, Vol 32, Issue 2, p203
- ISSN
0971-4693
- Publication type
Article