Evaluation of the Efficiency of metribuzin (WP 70%) in the Control of Weeds of Wheat, Triticum aestivum L. Field

This experiment was conducted during 2003-2005 to evaluate the efficacy of metribuzin in the control of weeds of wheat field at the Safi Abad agricultural research center of Dezful, Iran. The experimental design was a randomized complete block design with 11 treatments in three replications. Treatments consisted of the application of: metribuzin at 210, 280 and 350 g ai/ha, metribuzin tribenuron at 210) g ai/ha, metribuzin clodinafop propargil at (210) g ai/ha at mid tillering stage of wheat, (iodosulfuron 駫⢲몺 mephenpyr diethyl) at 21 g ai/ha plus citoweet non-ionic surfactant at 0.25%, sulfosulfuronat 20 g/ha, (tribenuron clodinafop propargil) at (19 640) g ai/ha as standard treatment, metribuzin at 210 g ai/ha at early tillering stage of wheat, weedy check, and ioxynilat 450 g ai/ha at mid tillering stage of wheat. On average, ranking of the effect of herbicide treatments on decreasing total number of weeds were: sufosulfuron > all treatments containing metribuzin > tribenuron牚ᶊ皟 > (iodosulfuron mesosulfuron mephenpyrdi ethyl) plus citoweet > ioxynil. On average, compared with the weedy check, wheat grain yield increased in metribuzin treatments by 22%. According to the results to control the weed effectively and to increase wheat grain yield, application of each of the metribuzin treatments at early tillering stage of wheat, ioxynil, sufosulfuron, metribuzin at 280 g ai/ha at mid tillering stage of wheat, metribuzin clodinafop propargil, tribenuron clodinafop and (iodosulfuron mesosulfuron mephenpyr diethyl) plus citoweet each at the above mentioned rates are recommended.