Influence Of Winter Wild Oat (Avena ludoviciana), Annual Canary Grass (Phalaris Minor) And Wild Mustard (Sinapis Arvensis) At Different Density On Yield And Yield Component Of Wheat
2007
Montazeri, M., Department of Weed Science, Plant Pest and Disease Research Institute, Iran
The effects of winter wild oat (Avena ludoviciana Dur.), annual canary grass (Phalaris minor Retz.) and wild mustard (Sinapis arvensis L.) respectively at 0-61, 0-39 and 0-74 plants m-2 on yield of wheat (cv. Flat) was evaluated. Winter wild oat and annual canary grass had no effect on height of wheat plants. Where as, wild mustard at 12.5 or more plants m-2, significantly reduced the height of wheat plants. Winter wild oat at 39 or more plants m-2 reduced 1000-grain weight and number of grain per spike. This weed at 11.5 to 61 plant m-2, reduced the grain yield 18 to 44 percent. Annual canary grass at 29 to 39 plants m-2 significantly reduced 1000-grain weight and 18 to 19 percent the grain yield, but had no effect on number of grain per spike. Wild mustard at 12.5 and 22.5 plants m-2, respectively reduced number of grain per spike and 1000-grain yield, significantly. Wheat grain yield loss due to the presence of wild mustard at 12.5 to 74 plants m-2 was evaluated 51 to 91 percent.
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