Mohsen Farshadfar; Ali Ashraf Jafari; Iraj Rezaie; Ezzat allah Farshadfar; Farzad Moradi; Hooshmand Safari
Volume 20, Issue 1 , June 2013, , Pages 182-198
Abstract
Drought resistance of forage yield for 36 accessions of Festuca arundinacea were examined in randomized complete block design with three replications in both irrigated and rainfed environments. Significant variation (P<0.01) for forage dry matter yield was observed between the environments and genotypes. ...
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Drought resistance of forage yield for 36 accessions of Festuca arundinacea were examined in randomized complete block design with three replications in both irrigated and rainfed environments. Significant variation (P<0.01) for forage dry matter yield was observed between the environments and genotypes. The results of mean comparisons showed that accessions 6 (Isfehan), 7 (Isfehan), 15 (Tavankesh), 25 (Australia), 26 (America) and 31 (Australia) had higher values for forage dry matter yield, in both environment conditions. Drought resistance indices of genotypes were measured for forage dry matter yield of two environment conditions including sensitivity to stress index (SSI), tolerance (TOL), mean productivity (MP), drought tolerant index (DTI), harmonic mean (MH) and geometrical mean of productivity (GMP). Variance analysis of drought resistance indices showed that accessions had significant variation (P<0.01). The first and second components from principal component analysis were accounted for 61.5 and 37.7 percent of variation among accessions for drought resistance indices, respectively. The indices of MP, DTI, MH and GMP as well as forage dry matter yield of stress and non-stress environments had the greatest share in first component. Also, these indices showed significant and positive correlation with forage dry matter yield of stress and non-stress environments, and based on these indices, the accession 6 (Esfahan), 7 (Esfahan), 31 (Australia) and 26 (America), showed the most resistance to drought stress. Our results were confirmed by cluster analysis.
Alireza Rahi; Hossein Mirzaie-Nodoushan; Mahmoud Danaee; Fereshteh Azizi
Volume 19, Issue 4 , March 2013, , Pages 722-736
Abstract
To investigate the effects of humic acid on vegetative characteristics of a rangeland species, Festuca arundinacea, a greenhouse experiment was conducted at Damavand city, Iran, based on a randomized complete block design. Levels of 0, 75, 150, and 225 kg per hectare of humic acid were used in a form ...
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To investigate the effects of humic acid on vegetative characteristics of a rangeland species, Festuca arundinacea, a greenhouse experiment was conducted at Damavand city, Iran, based on a randomized complete block design. Levels of 0, 75, 150, and 225 kg per hectare of humic acid were used in a form of granules as different treatment levels. Several vegetative characteristics were studied and recorded on the single plants. Analysis of variance showed that treatment effects on leaf area, leaf number, leaf, stems and whole canopy fresh weight, leaves, stems and roots dry weight, root length, canopy to root ratio, total chlorophyll and chlorophyll a were significant at 5% level. Also, the treatment effects on canopy dry weight and root fresh weight were significant at 1% level. Treatment effect was not statistically significant on tiller number, collar diameter and chlorophyll b. Maximum dry and fresh root weight were obtained by 75 kg per hectare humic acid. Most of the attributes were highly affected by applying 225 kg per hectare humic acid.