Abstract:
Field studies were undertaken at the Agronomic Research Area, Faculty of Agriculture, Gomal University, Dera Ismail Khan, Pakistan, during 2006-07, to investigate the effectiveness of allellochemicals of sorghum and sunflower water extracts. The experiment was laid out in Randomized Complete Block Design with four replications. The approved sunflower variety ‘Pioneer 64–A93, in plot size of 4×2.8 m2 was planted on 10th March 2007. The experiment comprised of six treatments and a weedy check (control). The treatments were Sorgaab (sorghum water extract)+ Sunflower water extract each at 18 L ha-1 (early Post-emergence), Sorgaab+ Sunflower water extract each at 15 L ha-1 (early pre-emergence), pendimethalin at 825 ml ha-1 full dose (pre-emergence), pendimethalin @ 413g ha-1 half dose (pre-emergence), Sorgaab + Sunflower water extract each at 18 L ha-1 + pendimethalin @ 413ml ha-1 (half dose) (preemergence) and Sorgaab + Sunflower water extract each at 15 L ha-1 + pendimethalin @ 13 ml ha-1 (half dose) as pre-emergence. Data were recorded on weed density, fresh and dry weed biomass, number of plants m-2, achene yield (kg ha-1), biological yield (kg ha-1) and harvest index (%). The lowest weed density AND consequently the highest biological yield (7443 kg ha-1) was observed in plots receiving full dose of pendimethalin @ 825 g ha-1. It was followed by plot using full dose of Sorgaab + sunflower + pendimethalin, where the biological yield was 7235 kg ha-1. Minimum yield (6025 kg ha-1) was recorded in the weedy check plots. Sorghum and sunflower water extracts are very useful in allelopathic control of weeds in different crops. This weed control strategy is environment friendly and also reduces the cost of production.
Page(s):
19-30
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Weed Science Research, Volume: 15, Issue: 1, Year: 2009