Mehdi Minbashi Moeini; Hamid Rahimian; Mohammad Ali Baghestani; Hassan Mohammad Alizadeh; Mir Masood Kheirkhah; Seiid Hossein Nazer Kakhki; hmad Dieh-Ji
Volume 5, Issue 4 , July 2008
Abstract
In order to study the phenology of weeds in the wheat fields and determining suitable indices for predicting phenology events and using the results for improvement chemical control, a trial was conducted in 2006-2007 growting season at Zanjan, Karaj, Varamin and Mahmoud Abad (Mazandaran). The seeds of ...
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In order to study the phenology of weeds in the wheat fields and determining suitable indices for predicting phenology events and using the results for improvement chemical control, a trial was conducted in 2006-2007 growting season at Zanjan, Karaj, Varamin and Mahmoud Abad (Mazandaran). The seeds of weeds (Broadleaved and grasses) were gathered in previous season. For satisfied emergence, the weed seeds were treated for breaking dormancy 24 hr before planting. Phenological events of wheat and weeds were recorded during growth season. Thermal time based on growing degree days (GDD) was calculated for each growth stage. Phenological and thermal time results of wheat and weeds compare with the optimum time application of recommended herbicide for weed control of weeds. Integrated results showed that GDD was a suitable index for determining and predicting of wheat and weeds growth stages. Also GDD could use for precision time of application of herbicides and could recommend that 400 GDD and 1200 GDD were minimum and maximum of herbicide application in wheat fields, respectively. Irrigation of field before planting and tillage applicable for control of the weed seeds without dormancy.
Mohammad Reza Labbafi; Assadollah Hejazi; Fariba Meighani; Hamideh Khalaj; Mohammad Ali Baghestani
Volume 5, Issue 3 , April 2008
Abstract
The 'equal compartment-agar method' was used to evaluate the allelopathic potential of wheat (Triticum aestivum) cultivars on the seedling growth of field bindweed (Convolvulus arvensis) and rye (Secale cereale). The experiment was carried out during 2005 at the Weed Research Department of the Iranian ...
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The 'equal compartment-agar method' was used to evaluate the allelopathic potential of wheat (Triticum aestivum) cultivars on the seedling growth of field bindweed (Convolvulus arvensis) and rye (Secale cereale). The experiment was carried out during 2005 at the Weed Research Department of the Iranian Crop Protection Research Institute, in a factorial form on a completely randomized design with three replications. Wheat cultivars in four levels (Shiraz and Niknejad, as more competitive cultivars; Tabasi and Roshan, as less competitive cultivars) and the density of wheat seedlings on four levels − 0 (control), 8, 16 and 24 − were considered as factors. Mean comparison showed that higher seedling density (at 24) had the greatest effect on decreasing rye growth (seedling, radicle, and hypocotyl) and all of the wheat cultivars showed a decrease in seedling, radicle and hypocotyl length in comparison with the control. All the wheat cultivars, especially at the highest density, decreased seedling and radicle length, but increased the hypocotyl length of field bindweed.
