Differential allelopathic potential of sunflower Helianthus annuus L genotypes on weeds and wheat Triticum aestivum L crop

Alsaadawi, I.S.; Sarbout, A.K.; Al-Shamma, L.M.

Archives of Agronomy and Soil Science 58(10): 1139-1148


ISSN/ISBN: 0365-0340
DOI: 10.1080/03650340.2011.570335
Accession: 036474024

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Studies were conducted to screen eight sunflower (Helianthus annuus L.) genotypes for their allelopathic potential against weeds and wheat crop, which customarily follows sunflower in Iraq. All sunflower genotypes significantly inhibited the total number and biomass of companion weeds and the magnitude of inhibition was genotype dependent. Among the eight genotypes tested, Sin-Altheeb and Coupon were the most weed-suppressing cultivars, and Euroflor and Shumoos were the least. A subsequent field experiment indicated that sunflower residues incorporated into the field soil significantly inhibited the total number and biomass of weeds growing in the wheat field. Sunflower genotypes Sin-Altheeb and Coupon appeared to inhibit total weed number and biomass more and significantly increased wheat yield compared with the least-suppressive genotypes (Euroflor and Shumoos). Chromatographic analyses by HPLC revealed the presence of 13 secondary metabolites in residues of the tested sunflower genotypes. All the isola.