RESPONSE OF WHEAT TO WEEDS CONTROL USING CHEMICAL HERBICIDES MIXTURE AND THER IMPACT ON YIELD AND ASSOCIATED WEEDS

Abstract

Field experimentes were carried out at the farm of Dept. of Field Crop Sciences, College of Agriculture , University of Baghdad , during winter seasons of (2009-2011), to evaluate the response of wheat to weed control by some herbicides and their mixture of [Florasulam+ Aminopyralid] Lancelot+ [Pyroxsulam]Pallas), (Clodinafop-methyl) Topic Logran, (Terbutryn +Triasulfuron) and Chevalier (Iodosulfuron+Mesosulfuron) The treatment of lancelot 32gm .ha-2 +Pallas 500 cm3.ha-2 gave less density of weeds (3.1 plant.m2) and achived completel weed control such as Avena fatua L, lolium temulentem, Mava paraviflora, Ammi majus,melilotus indicus L and polygonum avicularo , also reduced dry weight of narrow leave weed to 93.5% and broad leave weed to 99.2% compared to weedy treatment. These result increased wheat yield and produced highest number of grain per spike (61.2 grain)and yield grain of 933.5 gm.m-2. Other herbicides treatments showed different result in reduceing number of weeds, for example chevalier gave 22.3 plant.m-2 and Topik gave 61.6 plant.m-2. The best treatment was the combination of (Pallas 500 cm3.m-2 +Lancolat 32g.m-2) which gave the highest grain yield of 933.5gm.m-2