Efficacy of different herbicides for controlling weeds in wheat crop-II. Weed dynamics and herbicides
2002
Khan, I. | Hassan, G. | Marwat, K.B. (NWFP Agricultural Univ., Peshawar (Pakistan). Dept. of Weed Science)
An experiment was laid out at Malakandher farm of the NWFP Agricultural University, Peshawar to study the efficacy of grass and broadleaf specific or broad spectrum herbicides alone and in mixtures in wheat cv. `Ghaznavi-98'. The experiment was designed in randomized complete block with 4 replications. The plot size measured 5 .x 1.50 m-2. All the recommended production package except the herbicidal treatments were equally adopted for all the experiment. Avena fatua, Poa annua, Medicago denticulata and Rumex crispus were the predominant weeds infesting the experiment. The data were recorded on the mortality (%) of grasses and broadleafs, density (m-2), relative density (%) and frequency (%). The analyses of data showed that mortality of the different weed species significantly varied with the differential treatment. Puma, Super-2, Topik and their tank mixtures with the broad leaf killers gave art excellent control of grasses. Isoproturon was, moderately effective in controlling grassy weeds and it emerged as very weak on wild oats. The braodleaf killers and their tank mixtures gave a remarkable control of broadleafs. Isoproturon was also equally effective in controlling broadleafs. The weed density was non-significant when recorded 30 Days after spray or at the time of harvesting wheat exhibiting that the herbicides gave a successful season long control of the target weeds. Tank mixing of grass and broadleaf specific herbicides offered a synergistic control of weeds, thus for effective weed management tank mixing of the two categories of herbicides is suggested.
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