Chemical Weed Control In Faba Bean (Vicia Faba L.) Using Two Foliar-Applied Herbicides

Abstract

This study was carried out in the Faculty of Agriculture, University of Khartoum, Shambat, during winter growing seasons of 2001/2002 and 2002/2003 to evaluate the efficacy of weed control of two post-emergence herbicides and their selectivity to faba bean. The used herbicides are imazethapyr (Pursuit) and haloxyfop (Gallant) and they were applied at (1.25, 1.5, 1.75) and (0.5, 1.0, 1.5) litre/ha respectively. Results showed that the high rate of imazethapyr and the hand weeding had given a highly significant (P< 0.01) increase in number of leaves per plant, number of branches per plant and in over dry weights of plants in the second season compared to unweeded control. Also results showed that the high rate of imazethapyr, had highly significantly (P< 0.01) increased the number of pods per plant compared to the weedy control in the second season. Also results showed that the high rate of imazethapyr in both seasons and the hand weeding in the first season had significantly (P < 0.05) increased the total seed yield compared to the weedy control and that the highest grain yield (tons/ha) was obtained by the high rate of imazethapyr in both seasons, and the hand weeding in the first season. The hand weeding treatment and imazethapyr at its all rates and the mixture had resulted in excellent weed control in both seasons (highly significant difference) except imazethapyr at its low and medium rates in season one which were resulted in a moderate weed control in the first season compared to the weedy control in terms of weed biomass. The best weed control was achieved with the high rate of imazethapyr in both seasons. Some weed species in the experimental site such as Rhyncosia memnonia and Solanum dubium were not affected by both herbicides in both seasons.