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:: Volume 5, Issue 3 (10-2003) ::
علوم زراعی 2003, 5(3): 0-0 Back to browse issues page
A survey of natural weed population interference in wheat crop in Mazandran Provience
Abstract:   (3503 Views)
To study the extent of yield loss that weeds may cause, and the most suitable index for estimating the reduction of wheat yield a survey has been conducted in Ghaemshahr in 1998-1999. For this purpose 27 plots in a farm with dimensions of 5×5 were indentified, and in different stages the density of weeds were counted and recorded. At the end of growing season, every single species in each plot was measured, seperately. For calculation and comparison of coefficient of damage in species, indices such as dry weight , plant equivalent ratio, and also average dry weight of a single weed plant was measured. The results shown that the ratio of weeds biomass to their number, provided a better index for estimating of wheet reduction in wheat yield. Yeild eguation was developed using multivariate regression, in which the effect of weeds in wheat crop is divided in two different groups the first inhibiting and the second as possitive effect. Intra specific competition of wheat plants was more than the inter specific competition.Two species (Rapistrum reugosum) and (Avena fatua) had the most effect on reducing wheat yield in this study. However Veronica persica and Artemisia sp. had the least effect on wheat yield reduction. In the next survey conducted, we found the positive effect of some species of weeds in inhibiting of those species with the of high competitive ability in wheat crop.
Keywords: Weeds, Interference, Yield loss, Intra-specific competition, Inter-specific competition
Full-Text [PDF 231 kb]   (1689 Downloads)    
Type of Study: Scientific & Research | Subject: Special
Received: 2015/03/2 | Accepted: 2015/03/2 | Published: 2015/03/2
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A survey of natural weed population interference in wheat crop in Mazandran Provience. علوم زراعی 2003; 5 (3)
URL: http://agrobreedjournal.ir/article-1-371-en.html


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Volume 5, Issue 3 (10-2003) Back to browse issues page
نشریه علوم زراعی ایران Iranian Journal of Crop Sciences
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