عنوان الدراسة :
Efficacy and selectivity of pendimethalin (Stomp), oxyfluorfen (Goal) and their tank mixtures on weed control in direct seeded onion (Allium cepa L.)
إسم الباحث :
Nasr Eldin K. Abdalla
تاريخ النشر :
Field trials were carried out to study the influence of sequential applications of the herbicides pendimethalin (Stomp), oxyfluorfen (Oxyfluorfen) and their tank mixtures on efficacy and selectivity to direct seeded onion. Experiments were carried out at the Gezira Research Station for two consecutive seasons (2003/04 and 2004/05) and at Shendi Research Station for one season (2005/06). Irrespective of season, pendimethalin at 1.19 and 1.79 kg a.i. ha-1 applied as basal dose maintained excellent and persistent control (81 – 100%) of grassy weeds. However, the control of broadleaved weeds varied from poor to good depending on the herbicide rate and season. Oxyfluorfen at 0.14 0.19 kg a.i. ha-1, irrespective of time of application, resulted in satisfactory to excellent control (62 – 92%) of broadleaved weeds throughout the season. However, the efficacy of oxyfluorfen against broadleaved weeds was improved when tank mixed with pendimethalin at 1.19 kg a.i. ha-1 and applied 4 weeks after crop sowing. All herbicide treatment reduced weed biomass in comparison to the unweeded control. Unrestricted weed growth seriously curtailed number of leaves per plant, bulb diameter and yield. In general, the herbicide treatments improved onion yield and yield components. Pendimethalin as
pre-emergence treatments increased onion yield by over 1-fold in comparison to the unweeded control. Oxyfluorfen and its tank mixtures, irrespective of rate and season, increased bulb yield by more than 4-fold.