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Pakistan Journal of Biological Sciences
  Year: 2008 | Volume: 11 | Issue: 5 | Page No.: 773-777
DOI: 10.3923/pjbs.2008.773.777
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Critical Period of Weed Control in Winter Canola (Brassica napus L.) in a Semi-Arid Region

M. Aghaalikhani and S.R. Yaghoobi

In order to determine the critical period of weed control in winter canola (Brassica napus L. cv. Okapi) an experiment was carried out at research field of Tarbiat Modarres University, Tehran, Iran on 2004-2005 growing season. Fourteen experimental treatments which divided into two sets were arranged in Randomized complete blocks design with four replications. In the first set, the crop was kept weed-free from emergence time to two-leaf stage (V2), four-leaf stage (V4), six-leaf stage (V6), eight-leaf stage (V8), early flowering (IF), 50% of silique set (50% SS) and final harvest (H). In the second set, weeds where permitted to grow with the crop until above mentioned stages. In this study critical period of weed control was determined according to evaluate seed bank emerged weed biomass effect on canola grain yield loss using Gompertz and logistic equations. Result showed a critical time of weed control about 25 days after emergence (between four to six-leaf stages) with 5% accepted yield loss. Therefore, weed control in this time could provide the best result and avoid yield loss and damage to agroecosystem.
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  •    Evaluating Weeds Competitive Ability in a Corn Field in Southern West of Iran
  •    Validation of a Model Relating Crop Yield and Weed Time of Emergence and Removal
How to cite this article:

M. Aghaalikhani and S.R. Yaghoobi, 2008. Critical Period of Weed Control in Winter Canola (Brassica napus L.) in a Semi-Arid Region. Pakistan Journal of Biological Sciences, 11: 773-777.

DOI: 10.3923/pjbs.2008.773.777






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