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EVALUATION OF SOME PRE-AND POSTEMERGENCE HERBICIDES FOR WEED CONTROL IN IRRIGATED WHEAT ( Triticum aestivum L.) AT KADAWA
ABSTRACT
Three post-emergence herbicides (Propanil plus 2,4-D, propanil plus bentazon and 2,4-D) and five pre-emergence herbicides (Oxadiazon, Metolachlor plus atrazine, metolachlor plus terbutryne, atrazine and metolachlor plus prometryne) at various rates were evaluated during the two dry seasons of 2002/03 and 2003/04, at Kadawa in the Sudan Savannah of Nigeria. Oxadiazon at 1.0 kg a.i/ha, propanil plus bentazon at 2.0 + 1.0 kg a.i/ha and metolachlor plus prometryne at 1.25 + 1.25 kg a.i/ha gave consistent low weed cover score and weed dry weight and enhanced crop growth parameters (crop vigour score, number of tillers, crop establishment score, plant height and total dry matter) yield and yield components (1000 grain weight, grain weight per spike, spike length, as well as grain yield). Sole rates of atrazine at 1.5 and 2.0 kg a.i/ha and its mixtures with metolachlor at 1.0 + 0.5, 1.33 + 0.66 and 1.66 +0.83 kg a.i/ha gave effective weed control up to 6WAS but significantly reduced wheat grain yield. Sole atrazine treatments particularly at 2.0 kg a.i/ha proved phytotoxic to wheat with noticeable symptoms of growth depression as reflected in crop vigour score, crop establishment score, plant height, total dry matter and grain yield comparable to the weedy check. Uncontrolled weed growth throughout the crop’s life cycle resulted in 43.72 percent mean yield loss compared to the best treatment (metolachlor plus prometryne at 1.25 + 1.25 kg a.i/ha) in the trial.
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