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| Efficacy of S-metolachlor, Diuron and their Tank Mixture for Weed Control in Sesame (Sesamum indicum L.), Gezira State, Sudan
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Mashaeir O. Kh. Alfas, Mohamed S. A. Zaroug, Hala E. Alloub and Mohamed ElKhawad,
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Abstract:
Field experiment was conducted at Gezira Research Station Farm, Wad Medani, Sudan to evaluate the efficacy and selectivity of s-metolachlor (Dual Gold 96% EC), diuron (Easy 80%WDG) and their mixture on weed control in sesame. The herbicides s-metolachlor at (0.97 and 1.21 kg a.i./ha), diuron at (0.36 and 0.48 kg a.i./ha) and their tank mixture at (0.97+0.36 and 1.21+0.36 kg a.i./ha) were applied as pre-emergence. Weeded and un-weeded treatments were added for comparison. The treatments were laid out in a randomized complete block design (RCBD) with four replicates. S-metolachlor at the two tested rates gave good control of grassy weeds (73% - 75%), (63%-73%) 4 and 8 weeks after sowing. Diuron at the two rates gave 75%- 86% broadleaved weed control four weeks after sowing and (51-61%) 8 weeks after sowing. Whereas, S-metolachlor in the tank mixture with diuron at the rate (0.97+0.36 kg a.i./ha) gave excellent control of grassy weeds (87%) early in the season and good control (71%) late in the season and gave 71%-88% grass weed control and 69%-90% broadleaved weed control at the rate of 1.21+0.36 kg a.i./ha throughout the season. S-metolachlor at 0.97 kg a.i./ha, and it's mixture with diuron at the two rates tested reduced significantly sesame plant population by (57%-71%) and gave low sesame yield even with the high performance on weeds. The highest yield (505 kg/ha) was obtained by the application of diuron at 0.48 kg a.i./ha comparable to the hand weeded control (670 kg/ha). For effective weed control and higher yield, a pre-emergence application of diuron at0.48 kg a.i./ha could be recommended.
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