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Title

EFFECT OF SINGLE AND MIXED USE OF BROAD LEAF AND GRASS HERBICIDES ON YIELD AND YIELD COMPONENTS OF WHEAT (CHAMRAN CULTIVAR) IN AHVAZ REGION

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 Start Page 67 | End Page 84

Abstract

 In order to compare the new broad leaf and grass herbicides with old ones and evaluation of their effects on yield and yield component of wheat (Chamran cultivar), an experiment was carried out in a completely randomized block design with 17 treatments and 4 repetitions in Ahvaz region in 2009. The treatments were: 3 grass herbicides (Topik, Axial and Traxos), 3 broad leaf herbicides (Granstar, Dialen super and Lintur), mixed of them, hand control and without control.Results showed that all parameters as biological yield, grain yield, harvest index and yield components (spike/m2, spiklet per spike, and seed per spiklet) with the exception of 1000 seed weight significantly affected by treatments.For all yield components with the exception of seed per spiklet the highest and lowest content recieved from hand control and without control treatments.Comparison between means showed that new herbicides and their mixture were better than old herbicides.Indices as Spike/m2 and spiklet per spike revealed the best effect on grain yield. It seems that lessening the efficacy of old herbicides, is due to mixing of these herbicides with each other and also applying herbicides recurrently, which provides the weeds a high level of tolerance to herbicides.

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